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Everlight Electronics Co Ltd LED ALGAAS RED DIFF 1.9MM Z-BENDPatent application title: ZOOM LENS AND IMAGE PICKUP APPARATUS EQUIPPED WITH SAME
Inventors:
& (Sakura-Shi, JP)
& (Tokyo, JP)
Assignees:
IPC8 Class: AG02B1514FI
USPC Class:
Class name:
Publication date:
Patent application number:
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A zoom lens includes a front lens group including a first lens unit and a
second lens unit, a reflecting mirror configured to bend an optical path,
and a rear lens group including two or more lens units. When the zoom
lens is retracted, the reflecting mirror performs at least one of
rotation and linear movement to provide space for the front lens group. A
focal length of a lens unit having the highest absolute value of
refractive power among negative lens units in the front lens group, a
focal length of the entire zoom lens at a telephoto end, a maximum value
and a minimum value of amounts of movement of the at least two lens units
in the rear lens group during zooming, a length of a reflecting surface
of the reflecting mirror, and a maximum effective diameter of the first
lens unit are appropriately set.Claims:
1. A zoom lens comprising, in order from an object side to an image side:
a front lens group including a first lens unit having positive refractive
power and a second lens unit having positive or negative refractive
a reflecting mirror configured to
and a rear
lens group including two or more lens units, wherein, during zooming, the
reflecting mirror is stationary, and the first lens unit and at least two
lens units included in the rear lens group move, wherein, when the zoom
lens is retracted, the reflecting mirror performs at least one operation
of a rotation around a rotational shaft and a movement in a direction of
an optical axis of the rear lens group, and at least part of the front
lens group is stored in a space formed by the operation of the reflecting
mirror, and wherein the following conditions are satisfied:
0.50&|(Mmax-Mmin)|/(D-Lp/ 2)&1.00
10.5&ft/|fn|&30.0 where fn
is a focal length of a lens unit having the highest absolute value of
refractive power among lens units having negative refractive power
included in the front lens group, ft is a focal length of the entire zoom
lens at a telephoto end, Mmax and Mmin are respectively a maximum value
and a minimum value of amounts of movement of the at least two lens units
included in the rear lens group during zooming from a wide-angle end to
the telephoto end, Lp is a length of a reflecting surface of the
reflecting mirror in a cross section including an optical axis of the
front lens group and an optical axis of the rear lens group, and D is a
maximum effective diameter of the first lens unit.
2. The zoom lens according to claim 1, wherein the following condition is
satisfied:
0.50&Lmax/(Lp/ 2)&2.00 where Lmax is a maximum value of
a lens configuration length of the two or more lens units constituting
the rear lens group.
3. The zoom lens according to claim 1, wherein the following condition is
satisfied:
0.10&fr/ft&0.40 where fr is a focal length of a lens
unit arranged closest to the image side in the rear lens group.
4. The zoom lens according to claim 1, wherein a lens unit having the
largest absolute value of refractive power among lens units having
negative refractive power included in the front lens group includes two
or more negative lenses, and the following condition is satisfied:
1.85&Nn&2.00 where Nn is an average of refractive indices of
materials of the two or more negative lenses.
5. The zoom lens according to claim 1, wherein a lens unit arranged
closest to the object side among the lens units constituting the rear
lens group includes a first lens subunit, and a second lens subunit
configured to move an imaging position in a direction perpendicular to
the optical axis of the rear lens group by moving in a direction having a
component of a direction perpendicular to the optical axis.
6. The zoom lens according to claim 1, wherein the following condition is
satisfied:
1.50&Zf/Zr&6.00 where Z f is a variable magnification
ratio of the front lens group, and Zr is a variable magnification ratio
of the rear lens group.
7. The zoom lens according to claim 1, wherein the reflecting mirror
performs both operations of the rotation and the movement in the
direction of the optical axis of the rear lens group when the zoom lens
is retracted.
8. The zoom lens according to claim 1, wherein the front lens group
consists of, in order from the object side to the image side, a first
lens unit having positive refractive power and a second lens unit having
negative refractive power, and wherein the rear lens group consists of,
in order from the object side to the image side, a third lens unit having
positive refractive power, a fourth lens unit having negative refractive
power, and a fifth lens unit having positive refractive power.
9. The zoom lens according to claim 1, wherein the front lens group
consists of, in order from the object side to the image side, a first
lens unit having positive refractive power, a second lens unit having
negative refractive power, a third lens unit having negative refractive
power, and wherein the rear lens group consists of, in order from the
object side to the image side, a fourth lens unit having positive
refractive power, a fifth lens unit having negative refractive power, and
a sixth lens unit having positive refractive power.
10. The zoom lens according to claim 1, wherein the front lens group
consists of, in order from the object side to the image side, a first
lens unit having positive refractive power and a second lens unit having
negative refractive power, and wherein the rear lens group consists of,
in order from the object side to the image side, a third lens unit having
negative refractive power, a fourth lens unit having positive refractive
power, a fifth lens unit having negative refractive power, and a sixth
lens unit having positive refractive power.
11. The zoom lens according to claim 1, wherein the front lens group
consists of, in order from the object side to the image side, a first
lens unit having positive refractive power and a second lens unit having
negative refractive power, and wherein the rear lens group consists of,
in order from the object side to the image side, a third lens unit having
positive refractive power and a fourth lens unit having positive
refractive power.
12. The zoom lens according to claim 1, wherein the front lens group
consists of, in order from the object side to the image side, a first
lens unit having positive refractive power, a second lens unit having
positive refractive power, and a third lens unit having negative
refractive power, and wherein the rear lens group consists of, in order
from the object side to the image side, a fourth lens unit having
positive refractive power, a fifth lens unit having negative refractive
power, and a sixth lens unit having positive refractive power.
13. The zoom lens according to claim 1, wherein, when the zoom lens is
retracted, the reflecting mirror is positioned such that a line normal to
the reflecting surface of the reflecting mirror becomes substantially
parallel to the optical axis of the front lens group.
14. The zoom lens according to claim 1, wherein, when the zoom lens is
retracted, the reflecting mirror is positioned such that the reflecting
surface of the reflecting mirror becomes substantially parallel to the
optical axis of the rear lens group.
15. An image pickup apparatus comprising: and a solid-state
image sensor configured to receive an image formed by the zoom lens,
wherein the zoom lens comprises, in order from an object side to an image
side: a front lens group including a first lens unit having positive
refractive power and a second lens unit having positive or negative
a reflecting mirror configured to
and a rear lens group including two or more lens units, wherein, during
zooming, the reflecting mirror is stationary, and the first lens unit and
at least two lens units included in the rear lens group move, wherein,
when the zoom lens is retracted, the reflecting mirror performs at least
one operation of a rotation around a rotational shaft and a movement in a
direction parallel to an optical axis of the rear lens group, and at
least part of the front lens group is stored in a space formed by the
operation of the reflecting mirror, and wherein the following conditions
are satisfied:
0.50&|(Mmax-Mmin)|/(D-Lp/ 2)&1.00
10.5&ft/|fn|&30.0 where fn is a focal length of a lens unit having
the highest absolute value of refractive power among lens units having
negative refractive power included in the front lens group, ft is a focal
length of the entire zoom lens at a telephoto end, Mmax and Mmin are
respectively a maximum value and a minimum value of amounts of movement
of the at least two lens units included in the rear lens group during
zooming from a wide-angle end to the telephoto end, Lp is a length of a
reflecting surface of the reflecting mirror in a cross section including
an optical axis of the front lens group and an optical axis of the rear
lens group, and D is a maximum effective diameter of the first lens unitDescription:
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a small-size and high-zoom-ratio
zoom lens suitable for a digital still camera, a video camera, and the
like. In particular, the present invention relates to a zoom lens that
facilitates reducing the size of an image pickup apparatus during a
non-photographing state.
[0003] 2. Description of the Related Art
[0004] As a photographic optical system used for an image pickup
apparatus, there is required a zoom lens that can provide high zoom
ratio, small size in the entire body, and a reduced thickness of a camera
(thickness in a longitudinal direction).
[0005] In order to realize a reduction in size of a camera, conventionally
there is known a retractable zoom lens in which a distance between lens
units becomes smaller during a non-photographing state than during a
photographing state, so that the lens units are stored in a camera body.
[0006] Also, in order to reduce a camera thickness, there is known an
optical-path-bending zoom lens in which a reflecting member (reflecting
mirror) configured to bend an optical axis of a photographic optical
system by 90° is arranged on the optical axis.
[0007] Also, there is known a zoom lens that bends an optical path using a
reflecting member during a photographing state and stores lens units
located on the object side of the reflecting member in a space formed by
driving the reflecting member during a non-photographing state. For
example, see Japanese Patent Application Laid-Open No.
U.S. Pat. No. 7,692,869.
[0008] A retractable zoom lens including a reflecting member configured to
bend an optical path of a photographic optical system can obtain a high
zoom ratio and reduce a camera thickness when applied to a camera.
However, in order to obtain these effects, it is important to
appropriately set a lens configuration of a zoom lens and appropriately
set an arrangement of a reflecting member on an optical path and a
configuration of lens units in front of and behind the reflecting member.
For example, it is important to appropriately set the lens configuration,
such as the number of lens units, a refractive power arrangement of each
lens unit, and a movement condition of each lens unit during zooming, and
it also is important to appropriately set a position when the reflecting
member is arranged on the optical path.
[0009] In particular, in order to obtain a high zoom ratio and reduce a
camera thickness, it is important to appropriately set a refractive power
of a variable-magnification lens unit located on the object side of the
reflecting member, and to set an amount of movement of a lens unit
located on the image side of the reflecting member during zooming. If
these configurations are not appropriately set, it is difficult to obtain
the above-described effects and image deterioration often occurs. In
Japanese Patent Application Laid-Open No. , a reflecting
member is arranged between the second lens unit and the third lens unit,
when counted from the object side. Also, Japanese Patent Application
Laid-Open No.
discusses a zoom lens in which a front lens
group located on the object side of the reflecting mirror is stored in an
empty space formed when the reflecting mirror rotates during the
non-photographing state.
[0010] In U.S. Pat. No. 7,692,869, the reflecting mirror is arranged
within the second lens unit when counted from the object side, and the
second lens unit does not move during zooming. Also, U.S. Pat. No.
7,692,869 discusses a zoom lens in which a lens unit located on the image
side of the reflecting member is moved toward the image side during a
non-photographing state, so that lens units located the object side are
stored in the empty space. In these zoom lenses, refractive power of a
lens unit having negative refractive power located on the object side of
the reflecting member is weaker than refractive powers of the other lens
[0011] Therefore, a total effective diameter of a front lens unit is
increased, or an amount of movement of a lens unit on the image side of
the reflecting member during zooming is increased so as to obtain a
desired zoom ratio. Also, a camera width tends to be increased. As a
result, it is difficult to achieve a high zoom ratio.
SUMMARY OF THE INVENTION
[0012] The present invention is directed to a zoom lens which can easily
obtain excellent image quality at a high zoom ratio and can easily reduce
a camera thickness when applied to a camera, and an image pickup
apparatus including the zoom lens.
[0013] According to an aspect of the present invention, a zoom lens
includes, in order from an object side to an image side, a front lens
group including a first lens unit having positive refractive power and a
second lens unit having positive or negative refractive power, a
reflecting mirror configured to bend an optical path, and a rear lens
group including two or more lens units. During zooming, the reflecting
mirror is stationary, and the first lens unit and at least two lens units
included in the rear lens group move. When the zoom lens is retracted,
the reflecting mirror performs at least one operation of a rotation
around a rotational shaft and a movement in a direction of an optical
axis of the rear lens group, and at least a part of the front lens group
is stored in a space formed by the operation of the reflecting mirror,
wherein the following conditions are satisfied:
0.50&|(Mmax-Mmin)|/(D-Lp/ 2)&1.00
10.5&ft/|fn|&30.0
[0014] where fn is a focal length of a lens unit having the highest
absolute value of refractive power among lens units having negative
refractive power included in the front lens group, ft is a focal length
of the entire zoom lens at a telephoto end, Mmax and Mmin are
respectively a maximum value and a minimum value of amounts of movement
of the at least two units included in the rear lens group during zooming
from a wide-angle end to the telephoto end, Lp is a length of a
reflecting surface of the reflecting mirror in a cross section including
an optical axis of the front lens group and an optical axis of the rear
lens group, and D is a maximum effective diameter of the first lens unit.
[0015] Further features and aspects of the present invention will become
apparent from the following detailed description of exemplary embodiments
with reference to the attached drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The accompanying drawings, which are incorporated in and constitute
a part of the specification, illustrate exemplary embodiments, features,
and aspects of the invention and, together with the description, serve to
explain the principles of the invention.
[0017] FIG. 1 is a lens sectional view of a zoom lens at the wide-angle
end according to a first exemplary embodiment of the present invention.
[0018] FIGS. 2A and 2B are aberration diagrams of the zoom lens at the
wide-angle end and the telephoto end, respectively, according to the
first exemplary embodiment.
[0019] FIG. 3 is a lens sectional view of a zoom lens at the wide-angle
end according to a second exemplary embodiment of the present invention.
[0020] FIGS. 4A and 4B are aberration diagrams of the zoom lens at the
wide-angle end and the telephoto end, respectively, according to the
second exemplary embodiment.
[0021] FIG. 5 is a lens sectional view of a zoom lens at the wide-angle
end according to a third exemplary embodiment of the present invention.
[0022] FIGS. 6A and 6B are aberration diagrams of the zoom lens at the
wide-angle end and the telephoto end, respectively, according to the
third exemplary embodiment.
[0023] FIG. 7 is a lens sectional view of a zoom lens at the wide-angle
end according to a fourth exemplary embodiment of the present invention.
[0024] FIGS. 8A and 8B are aberration diagrams of the zoom lens at the
wide-angle end and the telephoto end, respectively, according to the
fourth exemplary embodiment.
[0025] FIG. 9 is a lens sectional view of a zoom lens at the wide-angle
end according to a fifth exemplary embodiment of the present invention.
[0026] FIGS. 10A and 10B are aberration diagrams of the zoom lens at the
wide-angle end and the telephoto end, respectively, according to the
fifth exemplary embodiment.
[0027] FIG. 11A is a lens sectional view of the zoom lens when an optical
path is bent by a reflecting mirror in the first exemplary embodiment,
and FIG. 11B is a diagram of an image pickup apparatus illustrating a
non-photographing state when the zoom lens is retracted, in accordance
with an embodiment of the present invention.
[0028] FIG. 12 is an illustration diagram of an image pickup apparatus
according to another exemplary embodiment of the present invention, when
the zoom lens according to the exemplary embodiment is retracted during a
non-photographing state.
DESCRIPTION OF THE EMBODIMENTS
[0029] Various exemplary embodiments, features, and aspects of the
invention will be described in detail below with reference to the
[0030] A zoom lens according to an exemplary embodiment of the present
invention includes, in order from an object side to an image side, a
front lens group including a first lens unit having positive refractive
power and a second lens unit having positive or negative refractive
power, a reflecting mirror configured to bend an optical path, and a rear
lens group including two or more lens units. During zooming, the
reflecting mirror is stationary, and the first lens unit and at least two
lens units included in the rear lens group move. When the zoom lens is
retracted, the reflecting mirror performs at least one operation of a
rotation around a rotational shaft and a movement in a direction of an
optical axis of the rear lens group, and at least a part of the front
lens group is stored in a space formed by the operation of the reflecting
[0031] FIG. 1 is a lens sectional view of a zoom lens at the wide-angle
end (short focal length end) according to a first exemplary embodiment of
the present invention. FIGS. 2A and 2B are aberration diagrams of the
zoom lens at the wide-angle end and the telephoto end (long focal length
end), respectively, according to the first exemplary embodiment. FIG. 3
is a lens sectional view of a zoom lens at the wide-angle end according
to a second exemplary embodiment of the present invention. FIGS. 4A and
4B are aberration diagrams of the zoom lens at the wide-angle end and the
telephoto end, respectively, according to the second exemplary
embodiment.
[0032] FIG. 5 is a lens sectional view of a zoom lens at the wide-angle
end according to a third exemplary embodiment of the present invention.
FIGS. 6A and 6B are aberration diagrams of the zoom lens at the
wide-angle end and the telephoto end, respectively, according to the
third exemplary embodiment. FIG. 7 is a lens sectional view of a zoom
lens at the wide-angle end according to a fourth exemplary embodiment of
the present invention. FIGS. 8A and 8B are aberration diagrams of the
zoom lens at the wide-angle end and the telephoto end, respectively,
according to the fourth exemplary embodiment. FIG. 9 is a lens sectional
view of a zoom lens at the wide-angle end according to a fifth exemplary
embodiment of the present invention. FIGS. 10A and 10B are aberration
diagrams of the zoom lens at the wide-angle end and the telephoto end,
respectively, according to the fifth exemplary embodiment.
[0033] In each exemplary embodiment, the optical path is bent by the
reflecting mirror provided on the optical path. However, for convenience,
an expanded state of the optical path is illustrated in each lens
sectional view. FIGS. 11A and 11B are a lens sectional view of the zoom
lens when the optical path is bent by the reflecting mirror in the first
exemplary embodiment, and an illustration diagram of an image pickup
apparatus when the zoom lens is retracted during non-photographing state,
respectively.
[0034] FIG. 12 is a diagram of an image pickup apparatus in a
non-photographing state, when the zoom lens is retracted during the
non-photographing state, according to another exemplary embodiment of the
present invention.
[0035] The zoom lens according to each exemplary embodiment is a
photographic lens systems used for an image pickup apparatus, such as a
video camera, a digital camera, and a silver-halide film camera. In each
lens sectional view, the left side of the drawing is an object side
(front side), and the right side is an image side (rear side). In each
lens sectional view, LF denotes the front lens group including the first
lens unit L1 having positive refractive power and the second lens unit
L2, UR denotes the reflecting mirror configured to bend the optical path
by 90° or about 90°, and LR denotes the rear lens group
including two or more lens units.
[0036] i denotes an order of the lens unit from the object side, and Li
denotes an i-th lens unit. SP denotes an aperture stop configured to
restrict an F-number light flux. G denotes an optical block, such as an
optical filter, a faceplate, a crystal low-pass filter, or an infrared
cutoff filter.
[0037] IP denotes an image plane. When the zoom lens is used as a
photographic optical system of a video camera or a digital still camera,
an imaging surface of a solid-state image sensor (photoelectric
conversion element), such as a charge-coupled device (CCD) sensor or a
complementary metal-oxide semiconductor (CMOS) sensor, is placed on the
image plane IP. When the zoom lens is used for a silver-halide film
camera, a photosensitive surface corresponding to a film surface is
placed on the image plane IP. An arrow indicates a moving locus of each
lens unit during zooming from the wide-angle end to the telephoto end. In
each aberration diagram, lines d and g denote d-line and g-line,
respectively, and ΔM and ΔS denote a meridional image plane
and a sagittal image plane, respectively. Chromatic aberration of
magnification is expressed with the g-line.
[0038] ω denotes a half angle of view (half value of photographing
field angle), and Fno denotes an F-number. Also, in each of the following
exemplary embodiments, the wide-angle end and the telephoto end refer to
zoom positions when a lens unit for variable magnification is positioned
at the respective ends of a range in which the lens unit for variable
magnification is mechanically movable along an optical axis.
[0039] In the zoom lens of each exemplary embodiment, the front lens group
LF includes, in order from the object side to the image side, a first
lens unit L1 having positive refractive power, and a second lens unit L2
having positive or negative refractive power. The rear lens group LR
includes a plurality of lens units. During zooming, the reflecting mirror
UR is stationary, and the first lens unit L1 and at least two lens units
included in the rear lens group LR move. Since the reflecting member UR
configured to bend light from the object side is included on the optical
path, the camera becomes thin in a thickness direction.
[0040] In the exemplary embodiment, the zoom lens is configured to
interchangeably be placed in a non-photographing position (in a
non-photographing state) and a photographing position (in a photographing
state). Notably, in the non-photographing state, at least part of the
zoom lens (front lens group LF) can be retracted into a space provided by
an operation of the reflecting member UR. Specifically, when the zoom
lens is retracted, the front lens group LF undergoes a moving operation
M2 and is stored in a space provided by an operation of the reflecting
member UR. In order to reduce a camera width dimension, when the zoom
lens is retracted, the reflecting member UR does not require a space in
an optical axis direction of the rear lens group (camera width). The
reflecting member UR is provided with a reflecting mirror, instead of a
conventionally used reflecting prism. In this manner, when the zoom lens
is retracted, the reflecting member UR takes much less space than a prism
would. The reflecting member UR is provided with the reflecting mirror,
and a traveling distance of the movable lens unit moving during zooming
is reduced so as to optically reduce the camera width.
[0041] Among the respective lens units constituting the front lens group
LF arranged on the object side of the reflecting mirror, a
negative-refractive-power lens unit having the maximum refractive power,
that is, having the largest absolute value of refractive power, is
appropriately set. In this manner, the effective diameter of the front
lens is reduced, and a desired zoom ratio is easily obtained.
[0042] Next, the retraction operation illustrated in FIG. 11B will be
described. When the zoom lens is retracted, the reflecting mirror UR and
the rear lens group LR move toward the image side, and the reflecting
mirror UR rotates around a rotational center. Therefore, a part of the
lens units of the front lens group LF is stored in a part of the space of
the camera width occurring during the retraction operation. In addition,
as the reflecting mirror UR is rotated and retracted, a part of the lens
units of the front lens group LF is stored in the empty space. Therefore,
the camera thickness is reduced.
[0043] In FIGS. 11A and 11B, during non-photographing, the reflecting
mirror UR performs both of the rotating operation R1 of rotating around
the rotational shaft rotatably supporting the reflecting mirror UR and
the moving operation M1 of moving in a direction parallel to the optical
axis of the rear lens group LR, but may perform either of the rotating
operation and the moving operation. For example, as illustrated in FIG.
12, during the retraction operation, the reflecting mirror UR does not
move in the direction parallel to the optical axis of the rear lens group
R, but simply rotates around the rotational center. Therefore, the
reflecting mirror UR may be stored such that a line normal to the
reflecting surface of the reflecting mirror UR becomes parallel to the
optical axis of the front lens group LF. Expressed in another way, the
reflecting mirror UR may be stored such that the reflecting surface of
the reflecting mirror UR becomes substantially parallel to the optical
axis of the rear lens group LR.
[0044] In each exemplary embodiment, the front lens group LF is arranged
on the object side with reference to the reflecting mirror UR, and the
rear lens group LR is arranged on the image side with reference to the
reflecting mirror UR. The reflecting mirror UR bends the optical axis of
the front lens group LF by about 90°) (±10° and guides
it toward the optical axis of the rear lens group LR. In other words, in
the photographing state, the reflecting mirror UR bends the optical path
of light passing through the front lens group LF by about) 90°
(±10° and guides the light through the rear lens group LR to
the image plane IP.
[0045] In each exemplary embodiment, fn denotes the focal length of a lens
unit having the highest absolute value of refractive power among lens
units having negative refractive power included in the front lens group
LF. ft denotes the focal length of the entire zoom lens at the telephoto
end. Mmax and Mmin respectively denote a maximum value and a minimum
value of amounts of movement of the at least two lens units included in
the rear lens group LR during zooming from the wide-angle end to the
telephoto end. Lp denote the length of the reflecting surface of the
reflecting mirror UR in the cross section including the optical axis of
the front lens group LF and the optical axis of the rear lens group LR,
and D denotes the maximum effective diameter of the first lens unit L1.
In this case, the following conditions are satisfied:
0.50&|(Mmax-Mmin)|/(D-Lp/ 2)&1.00
10.5&ft/|fn|&30.0
[0046] The amount of movement of a lens unit during zooming from the
wide-angle end to the telephoto end refers to a difference between a
position of the lens unit closest to the object side and a position of
the lens unit closest to the image side during zooming from the
wide-angle end to the telephoto end.
[0047] The zoom lens of each exemplary embodiment is a positive lead-type
zoom lens in which a lens unit closest to the object side has positive
refractive power. The zoom lens having a high zoom ratio is realized in
such a manner that, during zooming, the reflecting mirror UR is
stationary, and the first lens unit L1 and at least two lens units of the
rear lens group LR move. In addition, a part of the front lens group LF
arranged on the object side with respect to the reflecting mirror UR is
stored during the retraction operation, thereby achieving a reduction in
the camera thickness.
[0048] The condition (1) defines a relation of the amount of movement of
the lens units included in the rear lens group LR during zooming, the
maximum effective diameter of the first lens unit L1 (outer diameter of
the front lens), and the size of the reflecting mirror UR. If the lower
limit of the condition (1) is exceeded, the space for storing the first
lens unit L1 is difficult to install in the camera width direction. On
the other hand, if the upper limit of the condition (1) is exceeded, the
variable magnification stroke by the variable magnification of the rear
lens group LR becomes too large. Therefore, the camera width is
increased. If the numerical range of the condition (1) is set as follows,
it is easy to realize a more compact camera.
0.60&|(Mmax-Mmin)|/(D-Lp/ 2)&1.00
[0049] The condition (2) defines the focal length of the lens unit having
the greatest absolute value of refractive power among the
negative-refractive-power lens units included in the front lens group LF.
If the lower limit of the condition (2) is exceeded, the refractive power
of the lens unit having the greatest absolute value of refractive power
among the negative-refractive-power lens units included in the front lens
group LF becomes too weak. Therefore, it is difficult to obtain a desired
zoom ratio. On the other hand, if the upper limit of the condition (2) is
exceeded, the refractive power of the lens unit having the greatest
absolute value of refractive power among the negative-refractive-power
lens units included in the front lens group LF becomes too strong. In
particular, the edge thickness of the negative lens is increased.
Therefore, it is difficult to reduce the camera thickness.
[0050] If the numerical range of the condition (2) is set as follows, it
is easy to realize a more compact camera.
12.0&ft/|fn|&20.0
[0051] According to each exemplary embodiment, the reduction in size of
the camera is facilitated, and the zoom lens having a high zoom ratio can
be obtained. However, it is more desirable to satisfy one or more of the
following conditions.
[0052] Lmax denotes a maximum value of a lens configuration length of the
two or more lens units constituting the rear lens group LR. fr denotes
the focal length of the lens unit arranged closest to the image side in
the rear lens group LR. The lens unit having the greatest absolute value
of refractive power among the negative-refractive-power lens units
included in the front lens group LF includes two or more negative lenses,
and Nn denotes the average refractive indices of materials of the two or
more negative lenses. Zf denotes the variable magnification ratio of the
front lens group LF, and Zr denotes the variable magnification ratio of
the rear lens group LR. In this case, it is desirable to satisfy one or
more of the following conditions:
0.50&Lmax/(Lp/ 2)&2.00
0.10&fr/ft&0.40
1.85&Nn&2.00
1.50&Zf/Zr&6.00
[0053] The technical significance of the above conditions will be
described below.
[0054] The condition (3) defines the thickness of the lens unit having the
longest lens configuration length among the lens units constituting the
rear lens group LR. If the lower limit of the condition (3) is exceeded,
the reflecting mirror UR becomes too large. Therefore, the camera size is
increased. On the other hand, if the upper limit of the condition (3) is
exceeded, the lens thickness of the rear lens group LR during the
retraction operation becomes too large. Therefore, the space occupied by
the rear lens group LR is increased, and the camera width is increased.
If the numerical range of the condition (3) is set as follows, it is easy
to realize a more compact camera.
1.00&Lmax/(Lp/ 2)&1.70
[0055] The condition (4) defines the focal length of the last lens unit
arranged closest to the image side. If the lower limit of the condition
(4) is exceeded, the refractive power of the last lens unit is increased.
Therefore, the effective diameter of the last lens unit is increased, and
the camera thickness is increased. On the other hand, if the upper limit
of the condition (4) is exceeded, it is difficult to secure a sufficient
variable magnification ratio by the rear lens group LR. Therefore, the
variable magnification sharing by the lens unit on the object side of the
reflecting mirror UR and the amount of movement by zooming are increased,
and the camera thickness is increased. If the numerical range of the
condition (4) is set as follows, it is easy to realize a more compact
0.10&fr/ft&0.33
[0056] The lens unit having the greatest absolute value of refractive
power among the negative-refractive-power lens units included in the
front lens group LF includes two or more negative lenses.
[0057] The condition (5) defines the average refractive index of materials
of the negative lens having the greatest absolute value of refractive
power among the negative-refractive-power lens units included in the
front lens group LF. If the lower limit of the condition (5) is exceeded,
the edge thickness of the negative lens is increased. Therefore, the
camera thickness is increased. On the other hand, in the material
exceeding the upper limit of the condition (5), a high-dispersion
material is generally used, and chromatic aberration correction becomes
difficult. Hence, the lens configuration becomes complicated, and the
camera size is increased. If the numerical range of the condition (5) is
set as follows, it is easy to realize a more compact camera.
1.85&N2n&1.95
[0058] The condition (6) defines a relation of the variable magnification
ratio of the front lens group LF with respect to the rear lens group LR.
If the lower limit of the condition (6) is exceeded, the variable
magnification sharing by the front lens group LF becomes too small.
Therefore, the horizontal width of the camera is increased. On the other
hand, if the upper limit of the condition (6) is exceeded, the variable
magnification sharing by the front lens group LF becomes too large.
Therefore, it is difficult to reduce the camera thickness. If the
numerical range of the condition (6) is set as follows, it is easy to
realize a compact camera having excellent balance.
1.50&Zf/Zr&5.50
[0059] In each exemplary embodiment, as illustrated in FIG. 12, the
reflecting mirror UR may rotate around the rotational center supporting
the reflecting mirror UR during non-photographing. A part of the front
lens group LF may be stored in the resultant space.
[0060] Therefore, with respect to the camera width direction during the
retraction operation, the front lens group LF disposed on the object side
may be stored by efficiently using the space occupied by the reflecting
mirror UR. Also, as illustrated in FIG. 11B, during non-photographing,
the reflecting mirror UR may perform both of the rotating operation and
the operation of moving in a direction substantially perpendicular to the
optical axis of the front lens group LF. Therefore, with respect to the
camera width direction, a part of the front lens group LF disposed on the
object side may be stored by efficiently using the space occupied by the
reflecting mirror UR.
[0061] The lens unit arranged closest to the object side among the lens
units constituting the rear lens group LR includes a first lens subunit,
and a second lens subunit configured to move an imaging position in a
direction perpendicular to the optical axis by moving in a direction
having a component of a direction perpendicular to the optical axis. The
high-zoom-ratio zoom lens having the reflecting mirror may be configured
such that the movable lens approaches the reflecting mirror side during
zooming from the wide-angle end to the telephoto end.
[0062] In this case, any of the lens units of the rear lens group LR are
divided into a plurality of partial lens units, and the lens units of the
image side are moved to have a component of a direction perpendicular to
the optical axis. Therefore, it is possible to prevent the interference
of the lens units with respect to the bent optical path, in particular,
at the telephoto end, and it is easy to correct a camera shake. Next, the
lens configuration of the zoom lens of each exemplary embodiment will be
described.
[0063] Hereinafter, a zoom lens according to the first exemplary
embodiment of the present invention will be described with reference to
FIG. 1. A front lens group LF includes, in order from an object side to
an image side, a first lens unit L1 having positive refractive power, and
a second lens unit L2 having negative refractive power. A rear lens group
LR includes, in order from the object side to the image side, a third
lens unit L3 having positive refractive power, a fourth lens unit L4
having negative refractive power, and a fifth lens unit L5 having
positive refractive power. A reflecting mirror UR is disposed between the
second lens unit L2 and the third lens unit L3.
[0064] During zooming from the wide-angle end to the telephoto end, the
second lens unit L2, the reflecting mirror UR, and the fourth lens unit
L4 are stationary. The first lens unit L1 moves linearly toward the
object side, or moves with a locus convex toward the image side. The
third lens unit L3 moves toward the object side and performs variable
magnification. In order to correct a variation in a position of an image
plane according to the variable magnification, the fifth lens unit L5
moves nonlinearly toward the image side.
[0065] In the present exemplary embodiment, the zoom lens having a high
zoom ratio of, for example, about 13 is realized in such a manner that,
during zooming, the reflecting mirror UR and the second and fourth lens
units L2 and L4 are stationary, and the first, third, and fifth lens
units L1, L3, and L5 move. During focusing, the fifth lens unit L5 moves.
[0066] In the present exemplary embodiment, the value of the condition (1)
is 0.98, and the value of the condition (2) is 12.2. Therefore, a compact
camera having a high zoom ratio is realized. The value of the condition
(3) on the thickness of the third lens unit L3 having the maximum lens
configuration length among the lens units constituting the rear lens
group LR is 1.32. Also, the value of the condition (4) on the refractive
power of the last lens unit is 0.22, which is a strong refractive power
arrangement. A driving amount of the rear lens group LR during variable
magnification is reduced.
[0067] The second lens unit L2 corresponds to the lens unit having the
greatest absolute value of refractive power among the
negative-refractive-power lens units included in the front lens group LF.
Since the refractive power of the second lens unit L2 is strong, the
second lens unit L2 is made of a material having 1.87 as the value of the
condition (5) on the average refractive index of materials of the
negative lenses included in the second lens unit L2. Also, in the
exemplary embodiment, the third lens unit L3 includes a first lens
subunit L3a and a second lens subunit L3b. The second lens subunit L3b
performs a camera shake correction.
[0068] Hereinafter, a zoom lens according to the second exemplary
embodiment of the present invention will be described with reference to
FIG. 3. A front lens group LF includes, in order from an object side to
an image side, a first lens unit L1 having positive refractive power, a
second lens unit L2 having negative refractive power, and a third lens
unit L3 having negative refractive power. A rear lens group LR includes,
in order from the object side to the image side, a fourth lens unit L4
having positive refractive power, a fifth lens unit L5 having negative
refractive power, and a sixth lens unit L6 having positive refractive
power. A reflecting mirror UR is disposed between the third lens unit L3
and the fourth lens unit L4.
[0069] In the zoom lens of the second exemplary embodiment, the zoom lens
having a high zoom ratio of, for example, about 15 is realized in such a
manner that, during zooming, the reflecting mirror UR and the third and
fifth lens units L3 and L5 are stationary, and the first, second, fourth,
and sixth lens units L1, L2, L4, and L6 move.
[0070] Specifically, during zooming from the wide-angle end to the
telephoto end, the first lens unit L1 moves linearly toward the object
side, or moves with a locus convex toward the image side. The second lens
unit L2 moves with a locus convex toward the image side. The fourth lens
unit L4 moves toward the object side. The fifth lens unit L5 moves with a
locus convex toward the object side. During focusing, the sixth lens unit
L6 moves. In the present exemplary embodiment, the value of the condition
(1) is 0.70, and the value of the condition (2) is 12.6. Therefore, a
compact camera having a high zoom ratio is realized.
[0071] The value of the condition (3) on the thickness of the fourth lens
unit L4 having the maximum lens configuration length among the lens units
constituting the rear lens group LR is 1.46. Also, the value of the
condition (4) on the refractive power of the last lens unit is 0.16,
which is a strong refractive power arrangement. A driving amount of the
rear lens group LR during variable magnification is reduced. The second
lens unit L2 corresponds to the lens unit having the greatest absolute
value of refractive power among the negative-refractive-power lens units
included in the front lens group LF.
[0072] Since the refractive power of the second lens unit L2 is strong,
the second lens unit L2 is made of a material having 1.87 as the value of
the condition (5) on the average refractive index of materials of the
negative lenses included in the second lens unit L2. Also, in the
exemplary embodiment, the fourth lens unit L4 includes a first lens
subunit L4a and a second lens subunit L4b. The second lens subunit L4b
performs a camera shake correction. The other points are similar to those
of the first exemplary embodiment.
[0073] Hereinafter, a zoom lens according to the third exemplary
embodiment of the present invention will be described with reference to
FIG. 5. A front lens group LF includes, in order from an object side to
an image side, a first lens unit L1 having positive refractive power, and
a second lens unit L2 having negative refractive power. A rear lens group
LR includes, in order from the object side to the image side, a third
lens unit L3 having negative refractive power, a fourth lens unit L4
having positive refractive power, a fifth lens unit L5 having negative
refractive power, and a sixth lens unit L6 having positive refractive
power. A reflecting mirror UR is disposed between the second lens unit L2
and the third lens unit L3.
[0074] In the zoom lens of the third exemplary embodiment, the zoom lens
having a high zoom ratio of, for example, about 15 is realized in such a
manner that, during zooming, the reflecting mirror UR and the third and
fifth lens unit L3 and L5 are stationary, and the first, second, fourth,
and sixth lens units L1, L2, L4, and L6 move. The moving locus of each
lens unit during zooming from the wide-angle end to the telephoto end in
the third exemplary embodiment is similar to the moving locus in the
second exemplary embodiment. During focusing, the sixth lens unit L6
[0075] In the present exemplary embodiment, the value of the condition (1)
is 0.90, and the value of the condition (2) is 12.5. Therefore, a compact
camera having a high zoom ratio is realized.
[0076] The value of the condition (3) on the thickness of the fourth lens
unit L4 having the maximum lens configuration length among the lens units
constituting the rear lens group LR is 1.39. Also, the value of the
condition (4) on the refractive power of the last lens unit is 0.18,
which is a strong refractive power arrangement. A driving amount of the
rear lens group LR during variable magnification is reduced. The second
lens unit L2 corresponds to the lens unit having the greatest absolute
value of refractive power among the negative-refractive-power lens units
included in the front lens group LF. Since the refractive power of the
second lens unit L2 is strong, the second lens unit L2 is made of a
material having 1.92 as the value of the condition (5) on the average
refractive index of materials of the negative lenses included in the
second lens unit L2.
[0077] Also, in the present exemplary embodiment, the fourth lens unit L4
includes a first lens subunit L4a and a second lens subunit L4b. The
second lens subunit L4b performs a camera shake correction. The other
points are similar to those of the first exemplary embodiment.
[0078] Hereinafter, a zoom lens according to the fourth exemplary
embodiment of the present invention will be described with reference to
FIG. 7. A front lens group LF includes, in order from an object side to
an image side, a first lens unit L1 having positive refractive power, and
a second lens unit L2 having negative refractive power. A rear lens group
LR includes a third lens unit L3 having positive refractive power, and a
fourth lens unit L4 having positive refractive power. A reflecting mirror
UR is disposed between the second lens unit L2 and the third lens unit
[0079] In the zoom lens of the fourth exemplary embodiment, the zoom lens
having a high zoom ratio of, for example, about 16 is realized in such a
manner that, during zooming, the reflecting mirror UR is stationary, and
the first to fourth lens units L1 to L4 move. Specifically, during
zooming from the wide-angle end to the telephoto end, the first lens unit
L1 moves linearly toward the object side, or moves with a locus convex
toward the image side. The second lens unit L2 moves with a locus convex
toward the image side. The third lens unit L3 moves toward the object
side. The fourth lens unit L4 moves with a locus convex toward the object
side. During focusing, the fourth lens unit L4 moves.
[0080] In the present exemplary embodiment, the value of the condition (1)
is 0.63, and the value of the condition (2) is 17.1. Therefore, a compact
camera having a high zoom ratio is realized. The value of the condition
(3) on the thickness of the third lens unit L3 having the maximum lens
configuration length among the lens units constituting the rear lens
group LR is 1.49. Also, the value of the condition (4) on the refractive
power of the last lens unit is 0.31, which is a strong refractive power
arrangement. A driving amount of the rear lens group LR during variable
magnification is reduced. The second lens unit L2 corresponds to the lens
unit having the greatest absolute value of refractive power among the
negative-refractive-power lens units included in the front lens group LF.
[0081] Since the refractive power of the second lens unit L2 is strong,
the second lens unit L2 is made of a material having 1.87 as the value of
the condition (5) on the average refractive index of materials of the
negative lenses included in the second lens unit L2. Also, in the present
exemplary embodiment, the third lens unit L3 includes a first lens
subunit L3a and a second lens subunit L3b. The second lens subunit L3b
performs a camera shake correction. The other points are similar to those
of the first exemplary embodiment.
[0082] Hereinafter, a zoom lens according to the fifth exemplary
embodiment of the present invention will be described with reference to
FIG. 9. A front lens group LF includes, in order from an object side to
an image side, a first lens unit L1 having positive refractive power, a
second lens unit L2 having positive refractive power, and a third lens
unit L3 having negative refractive power. A rear lens group LR includes,
in order from the object side to the image side, a fourth lens unit L4
having positive refractive power, a fifth lens unit L5 having negative
refractive power, and a sixth lens unit L6 having positive refractive
power. A reflecting mirror UR is disposed between the third lens unit L3
and the fourth lens unit L4.
[0083] In the zoom lens of the fifth exemplary embodiment, the zoom lens
having a high zoom ratio of, for example, about 16 is realized in such a
manner that, during zooming, the reflecting mirror UR and the third lens
unit L3 are stationary, and the first, second, fourth, fifth, and sixth
lens units L1, L2, L4, L5, and L6 move. Specifically, during zooming from
the wide-angle end to the telephoto end, the first, second, and fourth
lens units L1, L2, and L4 move toward the object side. The fifth lens
unit L5 moves with a locus convex toward the image side. The sixth lens
unit L6 moves with a locus convex toward the object side.
[0084] During focusing, the sixth lens unit L6 moves. In the present
exemplary embodiment, the value of the condition (1) is 0.83, and the
value of the condition (2) is 15.7. Therefore, a compact camera having a
high zoom ratio is realized.
[0085] The value of the condition (3) on the thickness of the fourth lens
unit L4 having the maximum lens configuration length among the lens units
constituting the rear lens group LR is 1.47. Also, the value of the
condition (4) on the refractive power of the last lens unit is 0.19,
which is a strong refractive power arrangement. A driving amount of the
rear lens group LR during variable magnification is reduced.
[0086] The third lens unit L3 corresponds to the lens unit having the
greatest absolute value of refractive power among the
negative-refractive-power lens units included in the front lens group LF.
Since the refractive power of the third lens unit L3 is strong, the third
lens unit L3 is made of a material having 1.87 as the value of the
condition (5) on the average refractive index of materials of the
negative lenses included in the third lens unit L2. Also, in the present
exemplary embodiment, the fourth lens unit L4 includes a first lens
subunit L4a and a second lens subunit L4b. The second lens subunit L4b
performs a camera shake correction. The other points are similar to those
of the first exemplary embodiment.
[0087] In all zoom lenses of the first to fifth exemplary embodiments, the
control of the opening size of the aperture stop may be performed so as
to reduce a variation in F-number during zooming. Also, when the zoom
lens is combined with an image pickup apparatus including an image sensor
configured to convert an optical image formed on a light receiving
surface into an electrical signal, distortion aberration may be
electrically corrected.
[0088] Next, numerical examples 1 to 5 respectively corresponding to the
first to fifth exemplary embodiments of the present invention will be
described. In each numerical example, i denotes an order of an optical
surface from the object side. ri denotes a radius of curvature of an i-th
optical surface (i-th surface), di denotes a distance between an i-th
surface and an (i+1) th surface, ndi and νdi respectively denote
refractive index and Abbe number of a material of an i-th optical member
with respect to d-line. Also, when k denotes a conic constant, A4, A6,
A8, and A10 denote aspheric coefficients, and X denotes a displacement
from a surface vertex along an optical axis at a position of a height H
from the optical axis, an aspheric surface shape is expressed as:
x=(h2/R)/[1+[1-(1+k)(h/R)2]1/2]+A4h4+A6h6+A8h.s-
up.8+A10h10
[0089] R is a paraxial radius of curvature. Also, for example, the
expression "E-Z" represents "10-z". In each numerical example, the
last two surfaces are surfaces of optical blocks such as a filter or a
faceplate. In each exemplary embodiment, aback focus (BF) is represented
by a distance from an image-side surface of the optical block to an image
plane. A total lens length is defined as the sum of the back focus and a
distance from a surface closest to the object side to the last surface.
Also, the correspondence to the conditions described above in each
numerical example is given in Table 1 below.
Numerical Example 1
TABLE-US-00001
[0090] Unit: mm
Surface Data
Effective Outer
Number r d nd νd Diameter Diameter
1 36.280 1.10 1. 27.32 28.5
2 22.075 5.00 1. 25.18
4 21.953 3.40 1. 23.62
5 83.784 (Variable)
6 67.363 1.05 1. 12.55
7* 7.239 2.86
8 -11.608 0.60 1. 8.77
9 8.601 0.19
10 9.629 2.04 1. 8.57
11 -92.242 4.80
12 ∞ (Variable)
13* 8.197 2.52 1. 7.44
14* -83.098 1.00
15 ∞ 1.00
16 9.731 0.60 1. 6.32
17 6.137 1.40
18 10.932 3.42 1. 6.63
19 -10.241 0.60 1. 6.53
20 -44.165 (Variable)
21 -16.021 0.70 1. 7.60
22 232.382 (Variable)
23* 14.352 3.61 1.4 11.05
24 -13.063 (Variable)
25 ∞ 0.80 1. 20.00
Aspheric Surface Data
Seventh Surface
K = -2.6 A4 = 1.2 A6 = -1.4
A8 = 1.0 A10 = -2.3
Thirteenth Surface
K = -2.3 A4 = -3.5 A6 = -1.5
Fourteenth Surface
K = 0.0 A4 = 4.1
Twenty-third Surface
K = 0.0 A4 = -2.0 A6 = 1.3
Various Data
Zoom Ratio 12.75
Angle Middle Telephoto
Focal 5.18 22.00 66.05
F-number 3.07 4.67 6.42
Half Angle 33.59 8.89 2.98
Image 3.44 3.44 3.44
Total Lens 72.08 82.71 88.34
BF 2.37 2.37 2.37
d5 0.50 11.14 16.87
d12 18.28 6.91 4.30
d20 1.36 12.73 15.29
d22 4.68 5.05 10.75
d24 8.10 7.72 1.97
Entrance 17.46 59.48 143.60
Exit Pupil
-61.28 152.44 38.52
Front 22.22 84.71 330.31
Front -2.81 -19.63 -63.68
Zoom Lens Unit Data
Front Rear
Lens Principal Principal
Focal Configuration Point Point
Unit Surface Length Length Position Position
1 1 32.00 9.59 2.33 -3.75
2 6 -5.41 11.54 1.45 -8.21
3 13 14.26 10.55 0.39 -7.75
4 21 -19.38 0.70 0.03 -0.37
5 23 14.66 3.61 1.33 -1.21
GB 25 ∞ 0.80 0.26 -0.26
Single-lens Data
Starting Focal
Lens Surface Length
1 1 -69.04
7 13 13.62
8 16 -21.25
9 18 10.23
10 19 -16.67
11 21 -19.38
12 23 14.66
13 25 0.00
Numerical Example 2
TABLE-US-00002
[0091] Unit: mm
Surface Data
Effective Diam-
Number r d nd νd Diameter eter
1 34.288 1.10 1. 26.50 27.50
2 20.047 4.76 1. 24.13
3 157.849 0.10
4 22.449 3.42 1. 23.37
5 106.336 (Variable)
6 102.105 1.05 1. 14.07
7* 7.207 3.24
8 -17.054 0.60 1. 9.85
9 10.643 0.10
10 10.710 2.17 1. 9.74
11 -238.729 (Variable)
12 -14.788 0.60 1. 8.13
13 -22.527 4.50
14 ∞ (Variable)
15* 7.500 3.13 1. 9.00
16* -67.550 1.00
17 (Stop) ∞ 1.00
18 12.503 0.60 1. 7.17
19 8.424 1.27
20 10.570 4.08 1. 6.74
21 -4.614 0.60 1. 6.06
22 69.938 (Variable)
23 -17.595 0.70 1. 7.67
24 46.227 (Variable)
25* 10.257 3.89 1. 11.13
26 -13.610 (Variable)
27 ∞ 0.80 1. 20.00
Aspheric Surface Data
Seventh Surface
K = 2.7 A4 = -5.3 A6 = -4.4
A8 = 1.5 A10 = 1.0
Fifteenth Surface
K = -1.0 A4 = 6.3 A6 = -8.6
Sixteenth Surface
K = -1.7 A4 = 1.4
Twenty-fifth Surface
K = 0.0 A4 = -2.8 A6 = 5.7
Various Data
Zoom Ratio 15.03
Wide Angle Middle Telephoto
Focal Length 5.18 25.00 77.84
F-number 3.07 4.33 5.72
Half Angle of View 33.59 7.83 2.53
Image Height 3.44 3.44 3.44
Total Lens Length 80.30 83.31 88.34
BF 1.84 1.84 1.84
d5 0.50 11.63 17.50
d11 9.71 1.54 0.80
d14 16.47 6.55 4.30
d22 1.79 11.71 13.97
d24 7.29 2.43 8.71
d26 3.98 8.90 2.51
Entrance Pupil 18.09 63.98 164.63
Exit Pupil 252.96 -261.06 33.94
Front Principal 23.38 86.61 431.14
Point Position
Front Principal -3.34 -23.16 -76.01
Point Position
Zoom Lens Unit Data
Front Rear
Lens Principal Principal
Starting Focal Configuration Point Point
Unit Surface Length Length Position Position
1 1 32.16 9.38 2.30 -3.59
2 6 -6.16 7.16 1.31 -3.84
3 12 -90.61 5.10 -0.79 -5.70
4 15 13.48 11.68 -4.04 -9.41
5 23 -16.42 0.70 0.11 -0.28
6 25 12.67 3.89 1.19 -1.57
GB 27 ∞ 0.80 0.26 -0.26
Single-lens Data
Starting Focal
Lens Surface Length
1 1 -59.11
6 10 10.88
7 12 -90.61
8 15 12.38
9 18 -32.71
10 20 6.13
11 21 -5.35
12 23 -16.42
13 25 12.67
14 27 0.00
Numerical Example 3
TABLE-US-00003
[0092] Unit: mm
Surface Data
Effective Diam-
Number r d nd νd Diameter eter
1 34.092 1.10 1. 26.50 27.50
2 19.352 4.94 1. 23.60
3 245.625 0.10
4 21.016 3.15 1. 21.39
5 103.274 (Variable)
6 86.233 1.05 1. 13.35
7* 6.606 3.12
8 -15.055 0.60 2. 9.19
9 12.951 0.10
10 12.063 2.16 1. 9.38
11 -35.833 (Variable)
12 ∞ 4.96
13 -15.308 0.60 1. 7.42
14 -41.341 (Variable)
15* 7.569 2.96 1. 8.11
16* -24.486 1.00
17(Stop) ∞ 1.00
18 10.632 0.60 1. 6.59
19 5.868 1.41
20 9.638 3.56 1. 6.83
21 -9.408 0.60 1. 6.54
22 715.065 (Variable)
23 -30.828 0.70 1. 7.48
24 19.534 (Variable)
25* 10.933 3.46 1. 11.39
26 -16.828 (Variable)
27 ∞ 0.80 1. 20.00
Aspheric Surface Data
Seventh Surface
K = 4.9 A4 = -1.7 A6 = -9.8
A8 = 2.6 A10 = -1.5
Fifteenth Surface
K = -4.5 A4 = -1.0 A6 = -5.2
Sixteenth Surface
K = -1.4 A4 = 1.0
Twenty-fifth Surface
K = 0.0 A4 = -1.5 A6 = 1.2
Various Data
Zoom Ratio 15.10
Wide Angle Middle Telephoto
Focal Length 5.18 22.00 78.22
F-number 3.07 4.84 6.46
Half Angle of View 33.59 8.89 2.52
Image Height 3.44 3.44 3.44
Total Lens Length 73.49 81.72 88.34
BF 2.40 2.40 2.40
d5 0.50 9.20 15.87
d11 5.28 4.80 4.80
d14 13.95 2.68 0.30
d22 0.85 12.10 14.49
d24 6.72 3.77 10.57
d26 5.84 8.81 1.94
Entrance Pupil 17.37 49.95 154.44
Exit Pupil -96.21 -174.21 42.84
Front Principal 22.28 69.21 383.94
Point Position
Front Principal -2.78 -19.60 -75.82
Point Position
Zoom Lens Unit Data
Front Rear
Lens Principal Principal
Starting Focal Configuration Point Point
Unit Surface Length Length Position Position
1 1 29.61 9.29 2.60 -3.27
2 6 -6.25 7.03 0.99 -4.28
3 12 -47.45 5.56 4.72 -0.63
4 15 12.16 11.12 -0.59 -8.24
5 23 -15.39 0.70 0.24 -0.15
6 25 14.17 3.46 0.95 -1.47
GB 27 ∞ 0.80 0.26 -0.26
Single-lens Data
Starting Focal
Lens Surface Length
1 1 -54.74
7 13 -47.45
8 15 10.80
9 18 -16.42
10 20 8.49
11 21 -11.52
12 23 -15.39
13 25 14.17
14 27 0.00
Numerical Example 4
TABLE-US-00004
[0093] Unit: mm
Surface Data
Effective Diam-
Number r d nd νd Diameter eter
1 60.269 1.10 1. 27.53 28.50
2 26.489 5.05 1. 26.22
3 -76.755 0.10
4 21.031 3.33 1. 23.09
5 75.809 (Variable)
6* -46.672 1.05 1. 12.32
7* 13.268 2.42
8 -8.325 0.60 1. 8.24
9 8.584 0.10
10 9.151 1.90 1. 8.16
11 -84.808 (Variable)
12 ∞ (Variable)
13* 6.467 4.00 1. 7.27
14* -21.838 1.00
15(Stop) ∞ 1.00
16 89.305 0.60 1. 5.56
17 6.084 1.09
18 7.546 3.64 1. 6.30
19 -7.668 0.60 1. 6.56
20* -22.132 (Variable)
21* 19.312 2.83 1. 10.24
22 -43.947 (Variable)
23 ∞ 0.80 1. 20.00
Aspheric Surface Data
Sixth Surface
K = 0.0 A4 = 2.2 A6 = 1.6
A8 = -3.9 A10 = 3.6
Seventh Surface
K = -1.7 A4 = 1.6 A6 = 2.6
A8 = 3.7 A10 = 1.8
Thirteenth Surface
K = -5.5 A4 = -5.5 A6 = 6.3
Fourteenth Surface
K = 0.0 A4 = 1.3
Twentieth Surface
K = -4.8 A4 = 3.6 A6 = 7.1
A8 = -3.9 A10 = 1.6
Twenty-first Surface
K = 0.0 A4 = 6.0 A6 = -1.6
Various Data
Zoom Ratio 15.67
Wide Angle Middle Telephoto
Focal Length 5.73 22.00 89.77
F-number 3.50 4.59 5.49
Half Angle of View 31.43 9.04 2.23
Image Height 3.50 3.50 3.50
Total Lens Length 71.65 80.06 86.60
BF 4.89 4.89 4.89
d5 0.50 10.50 17.50
d11 6.75 5.10 4.80
d12 17.21 6.55 4.30
d20 5.79 6.60 23.79
d22 5.29 15.21 0.10
d24 4.89 4.89 4.89
Entrance Pupil 16.81 57.16 230.25
Exit Pupil -27.17 -39.61 477.85
Front Principal 21.51 68.29 337.06
Point Position
Front Principal -0.83 -17.11 -84.88
Point Position
Zoom Lens Unit Data
Front Rear
Lens Principal Principal
Starting Focal Configuration Point Point
Unit Surface Length Length Position Position
1 1 29.06 9.58 3.22 -2.74
2 6 -5.25 6.08 1.51 -2.71
3 13 16.98 11.93 -2.90 -10.75
4 21 27.93 2.83 0.59 -1.34
GB 23 ∞ 0.80 0.26 -0.26
Single-lens Data
Starting Focal
Lens Surface Length
1 1 -56.67
4 6 -12.04
7 13 10.15
8 16 -7.70
10 19 -13.55
11 21 27.93
12 23 0.00
Numerical Example 5
TABLE-US-00005
[0094] Unit: mm
Surface Data
Effective Diam-
Number r d nd νd Diameter eter
1 40.115 1.10 1. 27.50 28.50
2 22.601 5.01 1. 24.86
3 -639.469 (Variable)
4 22.411 3.31 1. 23.18
5 96.137 (Variable)
6 121.669 1.05 1. 13.43
7* 8.387 3.09
8 -13.033 0.60 1. 9.44
9 8.611 0.10
10 9.163 2.11 1. 9.09
11 293.593 4.80
12 ∞ (Variable)
13* 7.266 3.67 1. 8.20
14* -530.318 1.00
15(Stop) ∞ 1.00
16 9.580 0.60 1. 6.37
17 5.742 1.45
18 10.456 3.47 1. 6.45
19 -9.352 0.60 1. 6.47
20 -35.445 (Variable)
21 -15.120 0.70 1. 6.99
22 118.961 (Variable)
23* 12.808 3.49 1. 11.80
24 -18.982 (Variable)
25 ∞ 0.80 1. 20.00
Aspheric Surface Data
Seventh Surface
K = 2.5 A4 = -1.2 A6 = -6.5
A8 = 3.8 A10 = -9.8
Thirteenth Surface
K = -3.6 A4 = -9.4 A6 = -1.0
Fourteenth Surface
K = 0.0 A4 = -9.6
Twenty-third Surface
K = 0.0 A4 = -9.1 A6 = 4.9
Various Data
Zoom Ratio 16.00
Wide Angle Middle Telephoto
Focal Length 5.41 23.69 86.55
F-number 3.07 4.43 5.75
Half Angle of View 32.53 8.29 2.28
Image Height 3.45 3.45 3.45
Total Lens Length 71.52 82.05 88.34
BF 2.22 2.22 2.22
d3 0.45 0.80 0.91
d5 0.60 10.84 17.14
d12 21.31 7.45 4.30
d20 5.69 8.24 6.56
d22 1.00 5.97 17.13
d24 2.30 8.58 2.13
Entrance Pupil 18.78 63.41 196.24
Exit Pupil -25.37 -204.08 40.49
Front Principal 23.13 84.38 478.51
Point Position
Front Principal -3.19 -21.47 -84.34
Point Position
Zoom Lens Unit Data
Front Rear
Lens Principal Principal
Starting Focal Configuration Point Point
Unit Surface Length Length Position Position
1 1 151.93 6.11 -0.93 -4.88
2 4 37.10 3.31 -0.56 -2.39
3 6 -5.50 11.75 1.73 -7.92
4 13 13.72 11.79 0.67 -8.62
5 21 -17.33 0.70 0.04 -0.35
6 23 16.27 3.49 0.98 -1.45
GB 25 ∞ 0.80 0.26 -0.26
Single-lens Data
Starting Focal
Lens Surface Length
1 1 -62.96
4 6 -10.65
7 13 12.99
8 16 -18.24
10 19 -15.92
11 21 -17.33
12 23 16.27
13 25 0.00
TABLE-US-00006
(1) (2) (3) (4) (5) (6)
Numerical 0.98 12.2 1.32 0.22 1.87 1.67
Numerical 0.70 12.6 1.46 0.16 1.87 2.19
Numerical 0.90 12.5 1.39 0.18 1.92 2.21
Numerical 0.63 17.1 1.49 0.31 1.87 5.47
Numerical 0.83 15.7 1.47 0.19 1.87 2.92
[0095] While the present invention has been described with reference to
exemplary embodiments, it is to be understood that the invention is not
limited to the disclosed exemplary embodiments. The scope of the
following claims is to be accorded the broadest interpretation so as to
encompass all modifications, equivalent structures, and functions.
[0096] This application claims priority from Japanese Patent Application
filed Jan. 11, 2012, which is hereby incorporated by
reference herein in its entirety.
Patent applications by
Ken Wada, Sakura-Shi JP
Patent applications by CANON KABUSHIKI KAISHA
Patent applications in class
Focus control
Patent applications in all subclasses
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