JP5573123B2 - Optical element, optical device, and optical element manufacturing method - Google Patents

Description

  The present invention relates to an optical element, an optical device having the optical element, and a method for manufacturing the optical element.

  Conventionally, zoom lenses, single focus lenses, and the like used for electronic still cameras have been proposed (see, for example, Patent Document 1).

JP 2006-221092 A

  However, in a conventional imaging optical system such as a zoom lens, since the focusing lens and the vibration-proof lens are located in different lens groups, the focusing lens driving mechanism and the vibration-proof lens driving mechanism are separately arranged. Therefore, there is a problem that it is difficult to reduce the size of the imaging optical system.

  The present invention has been made in view of the above problems, and is an optical element having both a focusing lens and an anti-vibration lens, which enables downsizing of an imaging optical system having the optical element and Provided are an optical element capable of obtaining high imaging performance, an optical device having the optical element, and a method for manufacturing the optical element.

In order to solve the above problems, the present invention provides:
Used in an imaging optical system having a plurality of lens groups, the plurality of lens groups change in the optical axis direction between adjacent lens groups upon zooming from the wide-angle end state to the telephoto end state,
Used in a lens group having a positive refractive power arranged on the image side from the most object side lens group in the imaging optical system,
In order from the object side, it has a first partial group of positive refractive power, a second partial group of positive refractive power, a third partial group of negative refractive power, and a fourth partial group of positive refractive power,
During the zooming, the optical axis direction interval between the first partial group and the second partial group is fixed,
The distance in the optical axis direction between the second partial group and the third partial group and the distance in the optical axis direction between the third partial group and the fourth partial group are always fixed,
Focusing from an infinite object point to a short distance object point by moving the first subgroup along the optical axis,
Moving the third partial group so as to include a component in a direction perpendicular to the optical axis;
An optical element characterized by having a positive refractive power as a whole is provided.

  The present invention also provides an optical apparatus comprising the optical element.

The present invention also provides:
Used in an imaging optical system having a plurality of lens groups, the plurality of lens groups change in the optical axis direction between adjacent lens groups upon zooming from the wide-angle end state to the telephoto end state,
Used in a lens group having a positive refractive power arranged on the image side from the most object side lens group in the imaging optical system,
In order from the object side, a positive refractive power having a first partial group having positive refractive power, a second partial group having positive refractive power, a third partial group having negative refractive power, and a fourth partial group having positive refractive power In the method of manufacturing an optical element,
At the time of zooming, an interval in the optical axis direction between the first partial group and the second partial group is fixed,
The optical axis direction interval between the second partial group and the third partial group and the optical axis direction interval between the third partial group and the fourth partial group are always fixed,
Focusing from an infinite object point to a short distance object point by moving the first subgroup along the optical axis,
In order from the object side, the first partial group of positive refractive power, the second partial group of positive refractive power, Provided is a method for manufacturing an optical element, characterized in that a third part group having a refractive power and a fourth part group having a positive refractive power are arranged.

  According to the present invention, an optical element having both a focusing lens and an anti-vibration lens, the optical element that enables downsizing of an imaging optical system having the optical element and provides high imaging performance And an optical device having the same and a method of manufacturing an optical element.

1 is a diagram illustrating a lens configuration of a zoom lens having an optical element according to a first example, where W indicates a wide angle end state, M indicates an intermediate focal length state, and T indicates a telephoto end state. FIG. 5A is a diagram illustrating various aberrations of the zoom lens having the optical element according to the first example in an infinitely focused state and a lateral aberration diagram at the time of image stabilization, in which FIG. , And (c) show aberration diagrams in the telephoto end state. FIG. 7A is a diagram illustrating various aberrations of the zoom lens having the optical element according to the first example when the close-up shooting distance is in focus, and a lateral aberration diagram when the image stabilization is performed, in which (a) is Rw = 1000 mm, and (b) is Rm = 1000 mm. , And (c) show aberration diagrams of Rt = 1000 mm, respectively. FIG. 6 is a diagram illustrating a lens configuration of a zoom lens having an optical element according to a second example, where W indicates a wide-angle end state, M indicates an intermediate focal length state, and T indicates a telephoto end state. FIG. 7A is a diagram illustrating various aberrations of the zoom lens having the optical element according to the second example in an infinite focus state and a lateral aberration diagram during image stabilization, where FIG. 9A is a wide-angle end state, and FIG. , And (c) show aberration diagrams in the telephoto end state. FIG. 7A is a diagram illustrating various aberrations of a zoom lens having an optical element according to Example 2 in a close-up shooting distance state and a lateral aberration diagram at the time of image stabilization. FIG. 10A is Rw = 1000 mm, and FIG. , And (c) show aberration diagrams of Rt = 1000 mm, respectively. FIG. 10 is a diagram illustrating a lens configuration of a zoom lens having an optical element according to a third example, where W indicates a wide-angle end state, M indicates an intermediate focal length state, and T indicates a telephoto end state. FIG. 9A is a diagram illustrating various aberrations of the zoom lens having the optical element according to the third example in an infinitely focused state and a lateral aberration diagram at the time of image stabilization, where (a) is a wide angle end state, and (b) is an intermediate focal length state. , And (c) show aberration diagrams in the telephoto end state. FIG. 9A is a diagram illustrating various aberrations of a zoom lens having an optical element according to Example 3 in a close-up shooting distance state and a lateral aberration diagram during image stabilization, where FIG. 10A is Rw = 1000 mm, and FIG. 9B is Rm = 1000 mm. , And (c) show aberration diagrams of Rt = 1000 mm, respectively. FIG. 10 is a diagram illustrating a lens configuration of a zoom lens having an optical element according to a fourth example, where W indicates a wide-angle end state, M indicates an intermediate focal length state, and T indicates a telephoto end state. FIG. 9A is a diagram illustrating various aberrations of the zoom lens having the optical element according to the fourth example in an infinitely focused state and a lateral aberration diagram at the time of image stabilization, in which FIG. , And (c) show aberration diagrams in the telephoto end state. FIG. 6A is a diagram illustrating various aberrations of a zoom lens having an optical element according to Example 4 in a close focus state and a lateral aberration diagram during image stabilization, where (a) shows Rw = 1000 mm and (b) shows Rm = 1000 mm. , And (c) show aberration diagrams of Rt = 1000 mm, respectively. FIG. 10 is a diagram illustrating a lens configuration of a zoom lens having an optical element according to Example 5, where W indicates a wide-angle end state, M indicates an intermediate focal length state, and T indicates a telephoto end state. FIG. 9A is a diagram illustrating various aberrations of the zoom lens having the optical element according to Example 5 in an infinite focus state and a lateral aberration diagram during image stabilization, where FIG. , And (c) show aberration diagrams in the telephoto end state. FIG. 7A is a diagram illustrating various aberrations of a zoom lens having an optical element according to Example 5 in a close focus range and a lateral aberration diagram during image stabilization, where (a) is Rw = 1000 mm and (b) is Rm = 1000 mm. , And (c) show aberration diagrams of Rt = 1000 mm, respectively. 1 shows an electronic still camera equipped with a zoom lens having an optical element according to an embodiment, where (a) shows a front view and (b) shows a rear view. Sectional drawing along the AA line of Fig.16 (a) is shown. The manufacturing method of the optical element of this application is shown.

  Hereinafter, optical elements according to embodiments of the present application will be described with reference to the drawings. The following embodiments are only for facilitating the understanding of the invention, and excluding additions and substitutions that can be performed by those skilled in the art without departing from the technical idea of the present invention. It is not intended.

  The optical element according to the present embodiment includes, in order from the object side, a first partial group having positive refractive power, a second partial group having positive refractive power, a third partial group having negative refractive power, and a fourth partial group having positive refractive power. The first sub-group is moved along the optical axis to focus from an infinite object point to a short-distance object point, and the third sub-group is orthogonal to the optical axis. It has a positive refractive power as a whole.

  Since this optical element has a positive refractive power and has both a focusing lens and an anti-vibration lens, it is possible to reduce the size of the imaging optical system having this optical element and achieve high image formation. Optical elements can be achieved that provide performance.

  The first partial group of positive refractive power is suitable for focusing from an infinite object point to a short distance object point because there are few variations in various aberrations during focusing. Moreover, the third partial group having a negative refractive power has a small outer diameter of the lens and is suitable for disposing an anti-vibration driving mechanism on the outer periphery of the lens. Therefore, the third partial group is arranged in a direction perpendicular to the optical axis. By moving the image so as to include a component, correction of an image plane such as camera shake, that is, image stabilization is performed.

  In the present optical element, it is desirable that the distance in the optical axis direction between the second partial group and the third partial group and the distance in the optical axis direction between the third partial group and the fourth partial group are always fixed. With such a configuration, when the present optical element is applied to the positive refractive power lens group of the variable magnification optical system, the moving mechanism can be simplified, and the occurrence of decentration aberrations at the time of variable magnification can be suppressed. it can.

  In the present optical element, it is desirable that the second partial group has at least three positive lenses and at least one negative lens. With such a configuration, the second partial group can satisfactorily correct various aberrations of the entire optical element, and also reduces aberration fluctuations during focusing and image stabilization of the entire imaging optical system having this optical element. Can do.

  Since the second partial group has the first partial group that is the focusing group on the object side and the third partial group that is the image stabilizing group on the image side, respectively, correction of aberration fluctuations during focusing and during image stabilization is possible. In order to perform well, a positive lens component for correcting aberration fluctuation at the time of focusing is arranged on the object side in the second partial group, and a positive lens component for correcting aberration fluctuation at the time of image stabilization on the image side in the second partial group. Are arranged so that different lens components correct aberration variations during focusing and during image stabilization. Here, the object side positive lens component for correcting aberration fluctuation at the time of focusing has at least two positive lenses and at least one negative lens, and the image side positive lens component for correcting aberration fluctuation at the time of image stabilization. Is configured so as to have at least one positive lens, and the second sub-group can satisfactorily correct aberration fluctuations during focusing and image stabilization of the entire imaging optical system having this optical element. be able to. The lens component refers to a lens made up of a single lens or a cemented lens.

In addition, it is desirable that this optical element satisfies the following conditional expression (1).
(1) 0.60 <Fb1 / Fb234 <1.70
Here, Fb1 represents the focal length of the first partial group, and Fb234 represents the combined focal length of the second partial group, the third partial group, and the fourth partial group.

  Conditional expression (1) is a conditional expression that defines an appropriate range of the ratio of the combined focal length of the second partial group, the third partial group, and the fourth partial group and the focal length of the first partial group. By satisfying conditional expression (1), it is possible to reduce aberration variation during focusing while reducing the overall length of the optical element.

  When exceeding the upper limit of conditional expression (1), the space | interval of a 1st partial group and a 2nd partial group spreads, and the full length of an optical element enlarges. If the refractive power of the second partial group is decreased in order to narrow this interval, the image plane fluctuation during image stabilization increases.

  Note that by setting the upper limit value of conditional expression (1) to 1.50, it is possible to more favorably correct the image plane fluctuation during image stabilization.

  If the lower limit value of conditional expression (1) is not reached, the distance between the first partial group and the second partial group is narrowed, making it difficult to secure a focusing space. If the refractive power of the second subgroup is increased to widen this interval in order to secure the space for focusing, the variation in spherical aberration at the time of focusing increases.

  By setting the lower limit value of conditional expression (1) to 0.80, it is possible to further reduce the variation of spherical aberration during focusing.

In addition, it is desirable that this optical element satisfies the following conditional expression (2).
(2) 0.60 <(Fb1 + Fb234) × Fb0 / (Fb1 × Fb234) <1.40
However, Fb1 is the focal length of the first partial group, Fb234 is the combined focal length of the second partial group, the third partial group, and the fourth partial group, and Fb0 is the focal point of the optical element when focused at infinity. Each distance is shown.

  By satisfying conditional expression (2), it is possible to reduce aberration fluctuations during focusing while reducing the overall length of the optical element.

  When exceeding the upper limit of conditional expression (2), the space | interval of a 1st partial group and a 2nd partial group spreads, and the full length of an optical element enlarges. If the refractive power of the second partial group is decreased in order to narrow this interval, the image plane fluctuation during image stabilization increases.

  Note that by setting the upper limit value of conditional expression (2) to 1.20, it is possible to more favorably correct image plane fluctuations during image stabilization.

  When the lower limit value of conditional expression (2) is not reached, the distance between the first partial group and the second partial group is narrowed, making it difficult to secure a focusing space. If the refractive power of the second subgroup is increased to widen this interval in order to secure the space for focusing, the variation in spherical aberration at the time of focusing increases.

  Note that by setting the lower limit value of conditional expression (2) to 0.80, it is possible to further reduce the fluctuation of spherical aberration during focusing.

In addition, this optical element is used for the positive refractive power lens group of the imaging optical system, and it is desirable that the following conditional expression (3) is satisfied.
(3) | Fall / Ff | <1.30
Here, Fall is the focal length of the imaging optical system at the telephoto end and at infinity, and Ff is the lens closest to the image side of the first partial group and all the lenses arranged closer to the object side than the lens on the image side. The combined focal length at the telephoto end of the optical system constructed by

  Conditional expression (3) is a composite focal length at the time of focusing at infinity of an optical system composed of the most image side lens of the first partial group and all the lenses arranged on the object side from the image side lens. And an appropriate range of the ratio of the focal lengths of the imaging optical system at the time of focusing on infinity. By satisfying conditional expression (3), it is possible to satisfactorily correct various aberrations such as spherical aberration of the imaging optical system having this optical element.

  The definition of the above range means that the most object of the second partial group with respect to an optical system composed of the most image side lens of the first partial group and all the lenses arranged on the object side of the image side lens. This is equivalent to prescribing the magnification of an optical system composed of the lens on the side and all the lenses arranged on the image side with respect to the lens on the object side. When the conditional expression (3) is satisfied, the magnifications of the first partial group and the second partial group are made equal, or the magnification of the first partial group is made smaller than the magnification of the second partial group. As a result, the aberration of the optical system constituted by the most image side lens of the first partial group and all the lenses arranged on the object side from the image side lens is made equal to the aberration of the second partial group. Alternatively, the effect of making the aberration smaller than that of the second subgroup is obtained, and various aberrations of the imaging optical system having the present optical element can be corrected satisfactorily.

  When the upper limit value of conditional expression (3) is exceeded, it becomes difficult to correct various aberrations such as spherical aberration of the imaging optical system having this optical element.

  By setting the upper limit value of conditional expression (3) to 1.00, various aberrations such as spherical aberration of the imaging optical system having this optical element can be corrected more favorably.

  In addition, this optical element is used in an imaging optical system, and is preferably used in a lens group having a positive refractive power disposed on the image side of the most object side lens group in the imaging optical system. With such a configuration, the imaging optical system having the present optical element can be reduced in size.

  This is because the outer diameter of the lens unit disposed on the image side of the lens unit closest to the object side is smaller than that of the lens unit closest to the object side. This is because, when this optical element is used for a lens group having a refractive power, the focusing lens driving mechanism and the anti-vibration lens driving mechanism can be arranged at a step portion from the outer diameter of the lens group closest to the object side.

  In the present optical element, it is desirable to arrange an aperture stop at a position adjacent to the object side or the image side of the first partial group. With this configuration, the present optical element has an aperture stop driving mechanism, a focusing lens driving mechanism, and an anti-vibration lens driving mechanism, and the imaging optical system having the present optical element can be miniaturized. it can.

  In addition, it is desirable that the imaging optical system having this optical element be about 10 mm to 30 mm in a state where the distance (back focus) from the apex of the lens surface closest to the image side to the image surface is the smallest.

  In the imaging optical system having this optical element, the image height is preferably 5.0 mm to 12.5 mm, and more preferably 5.0 mm to 9.5 mm.

  Hereinafter, each numerical example of the zoom lens having the optical element according to the present embodiment will be described with reference to the accompanying drawings.

(First embodiment)
FIG. 1 is a diagram illustrating a lens configuration of a zoom lens that is an imaging optical system having an optical element according to the first embodiment, where W is a wide-angle end state, M is an intermediate focal length state, and T is a telephoto end. Each state is shown. In addition, the code | symbol which shows the lens used for the following description is described only in the telephoto end state T, and description is abbreviate | omitted about another state. The same applies to other embodiments.

  The zoom lens having the optical element according to the first example includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, an aperture stop S1, and a positive refractive power. It is composed of a rear group Gr made of an optical element Oc, a dustproof glass G, an optical low-pass filter OLPF, and a cover glass CG of a solid-state imaging device arranged on the image plane I.

  The first lens group G1 is composed of, in order from the object side, a biconvex positive lens L11, a negative meniscus lens L12 having a convex surface facing the object side, and a positive meniscus lens L13 having a convex surface facing the object side. It consists of a lens.

  The second lens group G2, in order from the object side, is composed of a negative meniscus lens L21 having a convex surface facing the object side, a biconcave negative lens L22, and a positive meniscus lens L23 having a convex surface facing the object side. The lens includes a negative meniscus lens L24 having a convex surface directed toward the image plane I side.

  The optical element Oc (rear group Gr) includes, in order from the object side, a first partial group Gr1 having a positive refractive power, a second partial group Gr2 having a positive refractive power, a third partial group Gr3 having a negative refractive power, and a field stop. S2 and a fourth partial group Gr4 having positive refracting power, and by moving the first partial group Gr1 along the optical axis, focusing from an infinite object point to a short-distance object point is performed. Image shift is performed on the image plane I by moving the subgroup Gr3 so as to include a component in a direction orthogonal to the optical axis.

  The first partial group Gr1 includes a biconvex positive lens Lr1.

  The second partial group Gr2 includes, in order from the object side, a cemented lens formed by cementing a biconvex positive lens Lr2 and a negative meniscus lens Lr3 having a convex surface facing the image plane I, and a biconvex positive lens Lr4. The lens is composed of a cemented lens formed by cementing a negative meniscus lens Lr5 having a convex surface toward the object side and a biconvex positive lens Lr6.

  The third partial group Gr3 includes, in order from the object side, a cemented lens formed by cementing a biconvex positive lens Lr7 and a biconcave negative lens Lr8.

  The fourth partial group Gr4 includes, in order from the object side, a biconvex positive lens Lr9 and a negative meniscus lens Lr10 having a convex surface directed toward the image plane I side.

  In the zoom lens having the optical element according to the first example, when zooming from the wide-angle end state W to the telephoto end state T, the first lens group G1 moves to the object side, and the second lens group G2 moves to the object side. The optical element Oc (rear group Gr) moves to the object side along a concave locus.

  Further, the diagonal image height IH from the center of the solid-state imaging device to the diagonal of the zoom lens having the optical element according to the first example is 8.5 mm.

  Table 1 below shows specification values of the zoom lens having the optical element according to the first example. In the table, (overall specifications) indicates the focal length F in each state of the wide-angle end state (W), the intermediate focal length state (M), and the telephoto end state (T), and the F number FNO.

  In (surface data), the object surface is the object surface, the surface number is the lens surface number counted from the object side, r is the radius of curvature of the lens surface, d is the surface spacing of the lens surfaces, nd is the d-line (wavelength λ = 587.6 nm), νd is the Abbe number with respect to the d-line (wavelength λ = 587.6 nm), (variable) is the variable surface interval in focus, (stop) is the aperture stop S1, and (field stop) is the field of view. The diaphragm S2 and the image plane represent the image plane I, respectively. Note that “∞” of the radius of curvature r indicates a plane, and the refractive index of air nd = 1.00000 is omitted.

  In addition, (variable interval at the time of focusing) includes the wide-angle end state (W), the intermediate focal length state (M), and the telephoto end state (T) at the time of focusing at infinity and focusing on the close range. The value of the variable interval at the focal length f and magnification β is shown. D0 represents the distance from the object to the lens surface closest to the object, Bf represents the back focus, and TL represents the total length of the zoom lens. The (anti-vibration lens group movement amount and image plane movement amount at the time of anti-shake correction) includes a wide-angle end state (W), an intermediate focal length state (M) at the time of focusing on infinity and focusing on a close range, The image plane movement amount with respect to the lens movement amount in each state of the telephoto end state (T) is shown. Further, (value corresponding to the conditional expression) indicates a value corresponding to each conditional expression.

  In all the following specification values, “mm” is generally used as the focal length f, radius of curvature r, surface interval d and other lengths, etc. unless otherwise specified, but the optical system is proportional. Even if it is enlarged or proportionally reduced, the same optical performance can be obtained. Further, the unit is not limited to “mm”, and other appropriate units may be used. In all the following embodiments, the same reference numerals as those in this embodiment are used, and the description thereof is omitted.

(Table 1)
(Overall specifications)
(W) (M) (T)
F 30.00 60.00 107.00
FNO 4.3 4.8 5.8

(Surface data)
Surface number rd nd νd
Object ∞
1) 104.9987 2.5000 1.516800 19.16
2) -98.0161 0.1000
3) 28.5522 1.1000 1.784700 50.44
4) 19.4068 4.4000 1.497820 14.95
5) 389.5870 (variable)
6) 223.4423 1.0000 1.741000 23.59
7) 22.0105 1.1000
8) -51.8131 1.0000 1.741000 23.59
9) 11.7594 2.2000 1.846660 56.14
10) 122.2362 1.2000
11) -16.7910 1.0000 1.741000 23.59
12) -1136.5791 (variable)
13> (Aperture) ∞ (Variable)
14) 73.3665 2.0000 1.516800 19.16
15) -27.2390 (variable)
16) 29.6447 3.3000 1.497820 14.95
17) -14.4744 1.0000 1.801000 36.97
18) -61.3016 0.1000
19) 13.3150 2.9000 1.517420 23.98
20) -157.6315 1.9000
21) 390.7053 1.0000 1.846660 56.14
22) 27.4326 2.0000 1.487490 17.31
23) -78.1115 2.7773
24) 106.3359 2.0000 1.805180 52.30
25) -15.0924 0.4904 1.804400 32.25
26) 15.0529 1.4000
27) (Field stop) ∞ 1.4924
28) 22.1990 2.1000 1.647690 38.54
29) -26.2091 1.1000
30) -9.6432 1.0000 1.795000 27.82
31) -22.0307 (variable)
32) ∞ 0.5000 1.516800 19.16
33) ∞ 4.6000
34) ∞ 1.8700 1.516800 19.16
35) ∞ 0.3000
36) ∞ 0.7000 1.516800 19.16
37) ∞ Bf
Image plane ∞

(Variable interval during focusing)
Focusing at infinity Focusing at close range
(W) (M) (T) (W) (M) (T)
F, β 30.00000 60.00000 107.00000 -0.03156 -0.06044 -0.10444
D0 ∞ ∞ ∞ 916.7700 906.4179 897.9680
d 5 1.81805 12.56575 16.54552 1.81805 12.56575 16.54552
d12 10.60697 5.94020 1.07619 10.60697 5.94020 1.07619
d13 1.40000 1.40000 1.40000 1.79703 2.53373 3.47996
d15 3.61101 3.61101 3.61101 3.21398 2.47728 1.53105
d31 15.16379 19.43504 28.76907 15.16379 19.43504 28.76907
Bf 0.50000 0.50000 0.50000 0.50000 0.50000 0.50000
TL 83.22999 93.58214 102.03195 83.22998 93.58216 102.03194

(Moving amount of image stabilization lens and amount of image plane movement during image stabilization)
Focusing at infinity Focusing at close range
(W) (M) (T) (W) (M) (T)
F, β 30.00000 60.00000 107.00000 -0.03156 -0.06044 -0.10444
Lens ± 0.122 ± 0.211 ± 0.292 ± 0.122 ± 0.211 ± 0.292
Image plane ± 0.157 ± 0.314 ± 0.560 ± 0.157 ± 0.314 ± 0.560

(Lens group data)
Group Start surface Focal length
G1 1 +45.606
G2 6 -10.732
Gr 14 +15.896

(Values for conditional expressions)
(1) Fb1 / Fb234 = 1.143
(2) (Fb1 + Fb234) × Fb0 / (Fb1 × Fb234) = 0.903
(3) | Fall / Ff | = 0.741

  FIGS. 2A and 2B are graphs showing various aberrations of the zoom lens having the optical element according to the first example in the infinite focus state and lateral aberrations at the time of image stabilization. FIG. 2A is a wide-angle end state, and FIG. Intermediate focal length state, (c) shows respective aberration diagrams in the telephoto end state. 3A and 3B are graphs showing various aberrations of the zoom lens having the optical element according to the first example when the close-up shooting distance is in focus and lateral aberrations at the time of image stabilization. FIG. 3A is Rw = 1000 mm, and FIG. Each aberration diagram of Rm = 1000 mm and (c) shows Rt = 1000 mm.

  In each aberration diagram, FNO is the F number, Y is the image height, NA is the numerical aperture, d is the d-line (λ = 587.6 nm), g is the g-line (λ = 435.6 nm), C Indicates the c-line (λ = 656.3 nm), and F indicates the f-line (λ = 486.1 nm). In the aberration diagram showing astigmatism, the solid line indicates the sagittal image plane, and the broken line indicates the meridional image plane. An aberration diagram showing lateral chromatic aberration is shown with reference to the d-line. In the aberration diagrams of all the following examples, the same reference numerals as those in this example are used, and description thereof is omitted.

  From the respective aberration diagrams, the zoom lens having the optical element according to the first example has various aberrations well corrected from the wide-angle end state to the telephoto end state and the anti-shake correction in each state, and has excellent imaging performance. You can see that it has.

(Second embodiment)
FIG. 4 is a diagram illustrating a lens configuration of a zoom lens that is an imaging optical system having an optical element according to the second embodiment, where W is a wide-angle end state, M is an intermediate focal length state, and T is a telephoto end. Each state is shown.

  The zoom lens having an optical element according to the second example includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, an aperture stop S1, and a positive refractive power. It is composed of a rear group Gr made of an optical element Oc, a dustproof glass G, an optical low-pass filter OLPF, and a cover glass CG of a solid-state imaging device arranged on the image plane I.

  The first lens group G1 is composed of, in order from the object side, a biconvex positive lens L11, a negative meniscus lens L12 having a convex surface facing the object side, and a positive meniscus lens L13 having a convex surface facing the object side. It consists of a lens.

  The second lens group G2 includes, in order from the object side, a cemented lens formed by cementing a biconcave negative lens L21, a biconcave negative lens L22, and a positive meniscus lens L23 having a convex surface toward the object side, and an image. It is composed of a negative meniscus lens L24 having a convex surface facing the surface I side.

  The optical element Oc (rear group Gr) includes, in order from the object side, a first partial group Gr1 having a positive refractive power, a second partial group Gr2 having a positive refractive power, a third partial group Gr3 having a negative refractive power, and a field stop. S2 and a fourth partial group Gr4 having positive refracting power, and by moving the first partial group Gr1 along the optical axis, focusing from an infinite object point to a short-distance object point is performed. Image shift is performed on the image plane I by moving the subgroup Gr3 so as to include a component in a direction orthogonal to the optical axis.

  The first partial group Gr1 includes a biconvex positive lens Lr1.

  The second partial group Gr2 includes, in order from the object side, a cemented lens formed by cementing a biconvex positive lens Lr2 and a negative meniscus lens Lr3 having a convex surface facing the image plane I, and a biconvex positive lens Lr4. And a cemented lens formed by cementing a biconcave negative lens Lr5 and a biconvex positive lens Lr6.

  The third partial group Gr3 includes, in order from the object side, a cemented lens formed by cementing a biconvex positive lens Lr7 and a biconcave negative lens Lr8.

  The fourth partial group Gr4 includes, in order from the object side, a biconvex positive lens Lr9 and a negative meniscus lens Lr10 having a convex surface directed toward the image plane I side.

  In the zoom lens having the optical element according to the second example, when zooming from the wide-angle end state W to the telephoto end state T, the first lens group G1 moves toward the object side, and the second lens group G2 moves toward the object side. The optical element Oc (rear group Gr) moves to the object side along a concave locus.

  In addition, the diagonal image height IH from the center of the solid-state imaging device to the diagonal of the zoom lens having the optical element according to the second example is 8.5 mm.

  Table 2 below shows specification values of the zoom lens having the optical element according to the second example.

(Table 2)
(Overall specifications)
(W) (M) (T)
F 30.00 60.00 107.00
FNO 4.3 4.8 5.8

(Surface data)
Surface number rd nd νd
Object ∞
1) 107.0898 2.5000 1.518230 58.89
2) -99.2726 0.1000
3) 28.8641 1.1000 1.784700 26.30
4) 19.4065 4.4000 1.497820 82.56
5) 623.6707 (variable)
6) -101.6830 1.0000 1.741000 52.67
7) 24.6928 1.1000
8) -64.6171 1.0000 1.741000 52.67
9) 11.7906 2.2000 1.846660 23.78
10) 114.2322 1.2000
11) -18.8537 1.0000 1.741000 52.67
12) -731.1191 (variable)
13> (Aperture) ∞ (Variable)
14) 56.9161 1.8000 1.516800 64.12
15) -26.1469 (variable)
16) 31.5479 3.6000 1.497820 82.56
17) -15.1490 1.1000 1.801000 34.96
18) -67.0657 0.1000
19) 13.3178 3.2000 1.517420 52.32
20) -143.8096 2.1000
21) -114.9972 1.1000 1.846660 23.78
22) 34.8934 2.2000 1.487490 70.45
23) -54.4846 2.8255
24) 106.3359 2.0000 1.805180 25.43
25) -15.0924 0.5000 1.804400 39.57
26) 15.0522 1.4000
27) (Field stop) ∞ 1.7841
28) 20.5121 2.1000 1.647690 33.79
29) -30.0605 1.1000
30) -10.0058 1.0000 1.795000 45.30
31) -21.5527 (variable)
32) ∞ 0.5000 1.516800 64.12
33) ∞ 4.6000
34) ∞ 1.8700 1.516800 64.12
35) ∞ 0.3000
36) ∞ 0.7000 1.516800 64.12
37) ∞ Bf
Image plane ∞

(Variable interval during focusing)
Focusing at infinity Focusing at close range
(W) (M) (T) (W) (M) (T)
F, β 30.00000 60.00000 107.00000 -0.03154 -0.06033 -0.10411
D0 ∞ ∞ ∞ 916.5652 906.2131 897.7633
d 5 2.22767 12.97537 16.95514 2.22767 12.97537 16.95514
d12 10.44476 5.77799 0.91398 10.44476 5.77799 0.91398
d13 1.45757 1.45757 1.45757 1.84273 2.55124 3.44966
d15 3.39604 3.39604 3.39604 3.01088 2.30237 1.40395
d31 13.92910 18.20035 27.53438 13.92910 18.20035 27.53438
Bf 0.50000 0.50000 0.50000 0.50000 0.50000 0.50000
TL 83.43475 93.78691 102.23670 83.43476 93.78690 102.23670

(Moving amount of image stabilization lens and amount of image plane movement during image stabilization)
Focusing at infinity Focusing at close range
(W) (M) (T) (W) (M) (T)
F, β 30.00000 60.00000 107.00000 -0.03154 -0.06033 -0.10411
Lens ± 0.128 ± 0.221 ± 0.303 ± 0.128 ± 0.221 ± 0.303
Image plane ± 0.157 ± 0.314 ± 0.560 ± 0.157 ± 0.314 ± 0.560

(Lens group data)
Group Start surface Focal length
G1 1 +45.606
G2 6 -10.732
Gr 14 +16.308

(Values for conditional expressions)
(1) Fb1 / Fb234 = 0.909
(2) (Fb1 + Fb234) × Fb0 / (Fb1 × Fb234) = 0.891
(3) | Fall / Ff | = 0.558

  FIGS. 5A and 5B are graphs showing various aberrations of the zoom lens having the optical element according to Example 2 in the infinite focus state and lateral aberrations at the time of image stabilization. FIG. 5A is a diagram illustrating a wide-angle end state, and FIG. Intermediate focal length state, (c) shows respective aberration diagrams in the telephoto end state. 6A and 6B are graphs showing various aberrations of the zoom lens according to the second example in the close-up shooting distance state and lateral aberrations at the time of image stabilization. FIG. 6A shows Rw = 1000 mm, FIG. 6B shows Rm = 1000 mm, (C) shows each aberration diagram of Rt = 1000 mm.

  From each aberration diagram, the zoom lens having the optical element according to the second example has various aberrations well corrected from the wide-angle end state to the telephoto end state and the image stabilization in each state, and has excellent imaging performance. You can see that it has.

(Third embodiment)
FIG. 7 is a diagram illustrating a lens configuration of a zoom lens that is an imaging optical system having an optical element according to the third example, where W is a wide-angle end state, M is an intermediate focal length state, and T is a telephoto end. Each state is shown.

  In the zoom lens having the optical element according to the third example, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, an aperture stop S1, and a positive refractive power. It is composed of a rear group Gr made of an optical element Oc, a dustproof glass G, an optical low-pass filter OLPF, and a cover glass CG of a solid-state imaging device arranged on the image plane I.

  The first lens group G1 is composed of, in order from the object side, a biconvex positive lens L11, a negative meniscus lens L12 having a convex surface facing the object side, and a positive meniscus lens L13 having a convex surface facing the object side. It consists of a lens.

  The second lens group G2 includes, in order from the object side, a cemented lens formed by cementing a biconcave negative lens L21, a biconcave negative lens L22, and a positive meniscus lens L23 having a convex surface toward the object side. It is composed of a concave negative lens L24.

  The optical element Oc (rear group Gr) includes, in order from the object side, a first partial group Gr1 having a positive refractive power, a second partial group Gr2 having a positive refractive power, a third partial group Gr3 having a negative refractive power, and a field stop. S2 and a fourth partial group Gr4 having positive refracting power, and by moving the first partial group Gr1 along the optical axis, focusing from an infinite object point to a short-distance object point is performed. Image shift is performed on the image plane I by moving the subgroup Gr3 so as to include a component in a direction orthogonal to the optical axis.

  The first partial group Gr1 includes a biconvex positive lens Lr1.

  The second partial group Gr2 includes, in order from the object side, a cemented lens formed by cementing a biconvex positive lens Lr2 and a negative meniscus lens Lr3 having a convex surface facing the image plane I, and a biconvex positive lens Lr4. And a cemented lens formed by cementing a biconcave negative lens Lr5 and a biconvex positive lens Lr6.

  The third partial group Gr3 includes, in order from the object side, a cemented lens formed by cementing a biconvex positive lens Lr7 and a biconcave negative lens Lr8.

  The fourth partial group Gr4 includes, in order from the object side, a biconvex positive lens Lr9 and a negative meniscus lens Lr10 having a convex surface directed toward the image plane I side.

  In the zoom lens having the optical element according to the third example, when zooming from the wide-angle end state W to the telephoto end state T, the first lens group G1 moves toward the object side, and the second lens group G2 moves toward the object side. The optical element Oc (rear group Gr) moves to the object side along a concave locus.

  In addition, the diagonal image height IH from the center of the solid-state imaging device to the diagonal of the zoom lens having the optical element according to the third example is 8.5 mm.

  Table 3 below shows specification values of the zoom lens having the optical element according to the third example.

(Table 3)
(Overall specifications)
(W) (M) (T)
F 30.00 60.00 107.00
FNO 4.3 4.8 5.8

(Surface data)
Surface number rd nd νd
Object ∞
1) 125.1574 2.5000 1.518230 58.89
2) -84.3301 0.1000
3) 28.3895 1.1000 1.784700 26.30
4) 18.9466 4.4000 1.497820 82.56
5) 419.5247 (variable)
6) -223.8932 0.8000 1.741000 52.67
7) 27.9983 1.1000
8) -41.3655 0.8000 1.741000 52.67
9) 12.3312 2.0000 1.846660 23.78
10) 160.7640 1.2000
11) -21.0724 0.8000 1.741000 52.67
12) 459.4400 (variable)
13> (Aperture) ∞ (Variable)
14) 122.4843 2.0000 1.516800 64.12
15) -28.4773 (variable)
16) 27.1989 2.8000 1.497820 82.56
17) -15.5490 0.8000 1.801000 34.96
18) -56.2214 0.1000
19) 12.4713 2.4000 1.517420 52.32
20) -468.0896 1.7000
21) -438.8420 0.8000 1.846660 23.78
22) 28.7077 1.6000 1.487490 70.45
23) -69.4120 2.6225
24) 112.2112 2.0000 1.805180 25.43
25) -15.9263 0.5000 1.804400 39.57
26) 15.8839 1.4000
27) (Field stop) ∞ 2.3924
28) 24.2073 2.1000 1.647690 33.79
29) -21.1678 1.1000
30) -9.8464 1.0000 1.795000 45.30
31) -27.4317 (variable)
32) ∞ 0.5000 1.516800 64.12
33) ∞ 4.6000
34) ∞ 1.8700 1.516800 64.12
35) ∞ 0.3000
36) ∞ 0.7000 1.516800 64.12
37) ∞ Bf
Image plane ∞

(Variable interval during focusing)
Focusing at infinity Focusing at close range
(W) (M) (T) (W) (M) (T)
F, β 30.00000 60.00000 107.00000 -0.03150 -0.06051 -0.10449
D0 ∞ ∞ ∞ 917.2587 907.7213 900.3241
d 5 2.29727 12.34224 16.45053 2.29727 12.34224 16.45053
d12 11.85041 6.39808 0.86562 11.85041 6.39808 0.86562
d13 0.42422 0.42422 0.42422 0.91515 1.76585 2.95151
d15 4.54719 4.54719 4.54719 4.05626 3.20556 2.01990
d31 15.03736 19.98210 28.80352 15.03736 19.98210 28.80352
Bf 0.49996 0.49996 0.49996 0.49996 0.49996 0.49996
TL 82.74133 92.27869 99.67587 82.74134 92.27868 99.67588

(Moving amount of image stabilization lens and amount of image plane movement during image stabilization)
Focusing at infinity Focusing at close range
(W) (M) (T) (W) (M) (T)
F, β 30.00000 60.00000 107.00000 -0.03154 -0.06033 -0.10411
Lens ± 0.125 ± 0.213 ± 0.300 ± 0.125 ± 0.213 ± 0.300
Image plane ± 0.157 ± 0.314 ± 0.560 ± 0.157 ± 0.314 ± 0.560

(Lens group data)
Group Start surface Focal length
G1 1 +45.606
G2 6 -11.422
Gr 14 +17.209

(Values for conditional expressions)
(1) Fb1 / Fb234 = 1.433
(2) (Fb1 + Fb234) × Fb0 / (Fb1 × Fb234) = 0.904
(3) | Fall / Ff | = 0.849

  FIGS. 8A and 8B are graphs showing various aberrations of the zoom lens having the optical element according to the third example in the infinite focus state and lateral aberrations during the image stabilization. FIG. 8A is a wide-angle end state, and FIG. Intermediate focal length state, (c) shows respective aberration diagrams in the telephoto end state. FIGS. 9A and 9B are graphs showing various aberrations of the zoom lens having the optical element according to the third example in the close-up shooting distance state and lateral aberrations when the image stabilization is performed. FIG. 9A shows Rw = 1000 mm, and FIG. Each aberration diagram of Rm = 1000 mm and (c) shows Rt = 1000 mm.

  From each aberration diagram, the zoom lens having the optical element according to the third example has various aberrations well corrected from the wide-angle end state to the telephoto end state and during image stabilization correction in each state, and has excellent imaging performance. You can see that it has.

(Fourth embodiment)
FIG. 10 is a diagram illustrating a lens configuration of a zoom lens that is an imaging optical system having an optical element according to the fourth example, where W is a wide-angle end state, M is an intermediate focal length state, and T is a telephoto end. Each state is shown.

  In the zoom lens having the optical element according to the fourth example, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group G3 having a negative refractive power. An aperture stop S1, a rear group Gr composed of an optical element Oc having a positive refractive power, a dustproof glass G, an optical low-pass filter OLPF, and a cover glass CG of a solid-state imaging device disposed on the image plane I. It is configured.

    The first lens group G1 is composed of, in order from the object side, a biconvex positive lens L11, a negative meniscus lens L12 having a convex surface facing the object side, and a positive meniscus lens L13 having a convex surface facing the object side. It consists of a lens.

  The second lens group G2 is composed of a biconcave negative lens L21.

  The third lens group G3 includes, in order from the object side, a cemented lens formed by cementing a biconcave negative lens L31 and a biconvex positive lens L32, and a negative meniscus lens L33 having a convex surface facing the image plane I side. It is composed of

  The optical element Oc (rear group Gr) includes, in order from the object side, a first partial group Gr1 having a positive refractive power, a second partial group Gr2 having a positive refractive power, a third partial group Gr3 having a negative refractive power, and a field stop. S2 and a fourth partial group Gr4 having positive refracting power, and by moving the first partial group Gr1 along the optical axis, focusing from an infinite object point to a short-distance object point is performed. Image shift is performed on the image plane I by moving the subgroup Gr3 so as to include a component in a direction orthogonal to the optical axis.

  The first partial group Gr1 of the optical element Oc is composed of a biconvex positive lens Lr1.

  The second partial group Gr2 of the optical element Oc includes, in order from the object side, a cemented lens formed by cementing a biconvex positive lens Lr2 and a negative meniscus lens Lr3 having a convex surface toward the image plane I, and a biconvex shape. The lens includes a positive lens Lr4, and a cemented lens formed by cementing a biconcave negative lens Lr5 and a biconvex positive lens Lr6.

  The third partial group Gr3 of the optical element Oc includes, in order from the object side, a cemented lens formed by cementing a biconvex positive lens Lr7 and a biconcave negative lens Lr8.

  The fourth partial group Gr4 of the optical element Oc includes, in order from the object side, a biconvex positive lens Lr9 and a negative meniscus lens Lr10 having a convex surface directed to the image plane I side.

  In the zoom lens having the optical element according to the fourth example, when zooming from the wide-angle end state W to the telephoto end state T, the first lens group G1 moves to the object side, and the second lens group G2 is S-shaped. The third lens group G3 moves along the optical axis along a concave locus on the object side, and the optical element Oc (rear group Gr) moves toward the object side.

  In addition, the diagonal image height IH from the center of the solid-state imaging device to the diagonal of the zoom lens having the optical element according to the fourth example is 8.5 mm.

  Table 4 below shows specification values of the zoom lens having the optical element according to the fourth example.

(Table 4)
(Overall specifications)
(W) (M) (T)
F 30.00 60.00 107.00
FNO 4.3 4.8 5.8

(Surface data)
Surface number rd nd νd
Object ∞
1) 80.5887 2.5000 1.518230 58.89
2) -125.6437 0.1000
3) 30.1350 1.1000 1.784700 26.30
4) 20.1659 4.4000 1.497820 82.56
5) 774.6747 (variable)
6) -139.0822 1.0000 1.741000 52.67
7) 23.4929 (variable)
8) -37.1938 1.0000 1.741000 52.67
9) 13.3906 2.2000 1.846660 23.78
10) -5477.8456 1.2000
11) -19.5048 1.0000 1.741000 52.67
12) -523.1128 (variable)
13> (Aperture) ∞ (Variable)
14) 64.7705 1.9000 1.516800 64.12
15) -26.6175 (variable)
16) 29.3621 3.4650 1.497820 82.56
17) -15.1957 1.1000 1.801000 34.96
18) -62.0277 0.1000
19) 13.2921 3.0000 1.517420 52.32
20) -105.3128 2.0000
21) -155.6218 1.1000 1.846660 23.78
22) 30.9418 2.1000 1.487490 70.45
23) -75.8545 2.5029
24) 106.3359 2.0000 1.805180 25.43
25) -15.0924 0.5000 1.804400 39.57
26) 15.0522 1.4000
27) (Field stop) ∞ 2.0046
28) 21.2520 2.1000 1.647690 33.79
29) -26.3195 1.1000
30) -10.1531 1.0000 1.795000 45.30
31) -24.9104 (variable)
32) ∞ 0.5000 1.516800 64.12
33) ∞ 4.6000
34) ∞ 1.8700 1.516800 64.12
35) ∞ 0.3000
36) ∞ 0.7000 1.516800 64.12
37) ∞ Bf
Image plane ∞

(Variable interval during focusing)
Focusing at infinity Focusing at close range
(W) (M) (T) (W) (M) (T)
F, β 30.00000 60.00000 107.00000 -0.03156 -0.06030 -0.10430
D0 ∞ ∞ ∞ 916.3279 904.9658 897.5260
d 5 2.18046 12.93514 16.90794 2.18046 12.93514 16.90794
d 7 1.36173 2.36263 1.36173 1.36173 2.36263 1.36173
d12 10.22924 5.55622 0.69846 10.22924 5.55622 0.69846
d13 1.42558 1.42558 1.42558 1.81567 2.53378 3.45546
d15 3.85828 3.85828 3.85828 3.46819 2.75008 1.82840
d31 14.27431 18.55389 27.87955 14.27431 18.55389 27.87955
Bf 0.50000 0.50000 0.50000 0.50000 0.50000 0.50000
TL 83.67210 95.03424 102.47403 83.67210 95.03424 102.47405

(Moving amount of image stabilization lens and amount of image plane movement during image stabilization)
Focusing at infinity Focusing at close range
(W) (M) (T) (W) (M) (T)
F, β 30.00000 60.00000 107.00000 -0.03154 -0.06033 -0.10411
Lens ± 0.124 ± 0.215 ± 0.296 ± 0.124 ± 0.215 ± 0.296
Image plane ± 0.157 ± 0.314 ± 0.560 ± 0.157 ± 0.314 ± 0.560

(Lens group data)
Group Start surface Focal length
G1 1 +45.606
G2 6 -27.052
G3 8 -20.092
Gr 14 +16.308

(Values for conditional expressions)
(1) Fb1 / Fb234 = 1.015
(2) (Fb1 + Fb234) × Fb0 / (Fb1 × Fb234) = 0.894
(3) | Fall / Ff | = 0.643

  FIGS. 11A and 11B are graphs showing various aberrations of the zoom lens having the optical element according to the fourth example in the infinite focus state and lateral aberrations at the time of image stabilization. FIG. 11A is a diagram illustrating a wide-angle end state, and FIG. Intermediate focal length state, (c) shows respective aberration diagrams in the telephoto end state. FIGS. 12A and 12B are graphs showing various aberrations of the zoom lens having the optical element according to Example 4 in the close-up shooting distance state and lateral aberrations at the time of image stabilization. FIG. 12A shows Rw = 1000 mm, and FIG. Each aberration diagram of Rm = 1000 mm and (c) shows Rt = 1000 mm.

  From each aberration diagram, the zoom lens having the optical element according to the fourth example has various aberrations well corrected from the wide-angle end state to the telephoto end state and during the image stabilization correction in each state, and has excellent imaging performance. You can see that it has.

(5th Example)
FIG. 13 is a diagram illustrating a lens configuration of a zoom lens that is an imaging optical system having an optical element according to the fifth example, where W is a wide-angle end state, M is an intermediate focal length state, and T is a telephoto end. Each state is shown.

  The zoom lens having an optical element according to the fifth example includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and an optical element Oc having a positive refractive power. The rear group Gr, the dust-proof glass G, the optical low-pass filter OLPF, and the cover glass CG of the solid-state imaging device disposed on the image plane I are configured.

  The first lens group G1 is composed of, in order from the object side, a biconvex positive lens L11, a negative meniscus lens L12 having a convex surface facing the object side, and a positive meniscus lens L13 having a convex surface facing the object side. It consists of a lens.

  The second lens group G2 includes, in order from the object side, a cemented lens formed by cementing a biconcave negative lens L21, a biconcave negative lens L22, and a positive meniscus lens L23 having a convex surface toward the object side, and an image. It is composed of a negative meniscus lens L24 having a convex surface facing the surface I side.

  The optical element Oc (rear group Gr) includes, in order from the object side, a first partial group Gr1 having a positive refractive power, an aperture stop S1, a second partial group Gr2 having a positive refractive power, and a third partial group having a negative refractive power. Consists of Gr3, field stop S2, and fourth subgroup Gr4 having positive refracting power. Focusing from an infinite object point to a close object point by moving the first subgroup Gr1 along the optical axis The third subgroup Gr3 is moved so as to include a component in a direction orthogonal to the optical axis, thereby performing image shift on the image plane I.

  The first partial group Gr1 includes a biconvex positive lens Lr1.

  The second partial group Gr2 includes, in order from the object side, a cemented lens formed by cementing a biconvex positive lens Lr2 and a negative meniscus lens Lr3 having a convex surface facing the image plane I, and a biconvex positive lens Lr4. And a cemented lens formed by cementing a biconcave negative lens Lr5 and a biconvex positive lens Lr6.

  The third partial group Gr3 includes, in order from the object side, a cemented lens formed by cementing a biconvex positive lens Lr7 and a biconcave negative lens Lr8.

  The fourth partial group Gr4 includes, in order from the object side, a biconvex positive lens Lr9 and a negative meniscus lens Lr10 having a convex surface directed toward the image plane I side.

  In the zoom lens having the optical element according to the fifth example, the first lens group G1 moves toward the object side and the second lens group G2 moves toward the object side upon zooming from the wide-angle end state W to the telephoto end state T. The optical element Oc (rear group Gr) moves to the object side along a concave locus.

  In addition, the diagonal image height IH from the center of the solid-state imaging device to the diagonal of the zoom lens having the optical element according to the fifth example is 8.5 mm.

  Table 5 below shows specification values of the zoom lens having the optical element according to the fifth example.

(Table 5)
(Overall specifications)
(W) (M) (T)
F 30.00 60.00 107.00
FNO 4.3 4.8 5.8

(Surface data)
Surface number rd nd νd
Object ∞
1) 107.0898 2.5000 1.518230 58.89
2) -99.2726 0.1000
3) 28.8641 1.1000 1.784700 26.30
4) 19.4065 4.4000 1.497820 82.56
5) 623.6707 (variable)
6) -101.6830 1.0000 1.741000 52.67
7) 24.6928 1.1000
8) -64.6171 1.0000 1.741000 52.67
9) 11.7906 2.2000 1.846660 23.78
10) 114.2322 1.2000
11) -18.8537 1.0000 1.741000 52.67
12) -731.1191 (variable)
13) 56.9161 1.8000 1.516800 64.12
14) -26.1469 (variable)
15> (Aperture) ∞ 0.1000
16) 31.5479 3.6000 1.497820 82.56
17) -15.1490 1.1000 1.801000 34.96
18) -67.0657 0.1000
19) 13.3178 3.2000 1.517420 52.32
20) -143.8096 2.1000
21) -114.9972 1.1000 1.846660 23.78
22) 34.8934 2.2000 1.487490 70.45
23) -54.4846 2.8255
24) 106.3359 2.0000 1.805180 25.43
25) -15.0924 0.5000 1.804400 39.57
26) 15.0522 1.4000
27) (Field stop) ∞ 1.7841
28) 20.5121 2.1000 1.647690 33.79
29) -30.0605 1.1000
30) -10.0058 1.0000 1.795000 45.30
31) -21.5527 (variable)
32) ∞ 0.5000 1.516800 64.12
33) ∞ 4.6000
34) ∞ 1.8700 1.516800 64.12
35) ∞ 0.3000
36) ∞ 0.7000 1.516800 64.12
37) ∞ Bf
Image plane ∞

(Variable interval during focusing)
Focusing at infinity Focusing at close range
(W) (M) (T) (W) (M) (T)
F, β 30.00000 60.00000 107.00000 -0.03154 -0.06033 -0.10411
D0 ∞ ∞ ∞ 916.5652 906.2131 897.7633
d 5 2.22767 12.97537 16.95514 2.22767 12.97537 16.95514
d12 11.90233 7.23556 2.37155 12.28749 8.32923 4.36364
d14 3.29604 3.29604 3.29604 2.91088 2.20237 1.30395
d31 13.92910 18.20035 27.53438 13.92910 18.20035 27.53438
Bf 0.50000 0.50000 0.50000 0.50000 0.50000 0.50000
TL 83.43475 93.78691 102.23670 83.43476 93.78690 102.23670

(Moving amount of image stabilization lens and amount of image plane movement during image stabilization)
Focusing at infinity Focusing at close range
(W) (M) (T) (W) (M) (T)
F, β 30.00000 60.00000 107.00000 -0.03154 -0.06033 -0.10411
Lens ± 0.128 ± 0.221 ± 0.303 ± 0.128 ± 0.221 ± 0.303
Image plane ± 0.157 ± 0.314 ± 0.560 ± 0.157 ± 0.314 ± 0.560

(Lens group data)
Group Start surface Focal length
G1 1 +45.606
G2 6 -10.732
Gr 13 +16.308

(Values for conditional expressions)
(1) Fb1 / Fb234 = 0.909
(2) (Fb1 + Fb234) × Fb0 / (Fb1 × Fb234) = 0.891
(3) | Fall / Ff | = 0.558

  14A and 14B are graphs showing various aberrations of the zoom lens having the optical element according to Example 5 in the infinitely focused state and lateral aberrations at the time of image stabilization. FIG. 14A is a diagram illustrating a wide-angle end state, and FIG. Intermediate focal length state, (c) shows respective aberration diagrams in the telephoto end state. 15A and 15B are graphs showing various aberrations of the zoom lens having the optical element according to Example 5 in the close-up shooting distance state and lateral aberrations at the time of image stabilization. FIG. 15A shows Rw = 1000 mm, and FIG. Each aberration diagram of Rm = 1000 mm and (c) shows Rt = 1000 mm.

  From each aberration diagram, the zoom lens having the optical element according to the fifth example has various aberrations well corrected from the wide-angle end state to the telephoto end state and during the image stabilization correction in each state, and has excellent imaging performance. You can see that it has.

  As described above, according to the present embodiment, the image forming optical system having both the focusing lens and the vibration proof lens and capable of downsizing the image forming optical system having the present optical element can achieve high image forming performance. An optical element can be achieved.

  In each of the above embodiments, the present optical element is used for a zoom lens that is an imaging optical system. However, the intended purpose of the present application is not limited to a zoom lens, and for example, the present optical element may be used for a single focus lens. good.

  In each of the above embodiments, the first partial group is composed of a single biconvex positive lens. However, the first partial group may have a concave-convex configuration in order to better correct chromatic aberration.

  In the zoom lens having the optical element according to each of the above embodiments, the first lens group has a positive refractive power. However, what is intended by the present application is not limited to this lens configuration. For example, in order to construct a wide-angle zoom, the first lens group may have negative refractive power, and this optical element may be used for the second lens group.

  Further, in the zoom lens having the optical element according to each of the above embodiments, all the lens groups are moved during zooming. However, the intention of the present application is not limited to this zooming method. For example, the first lens unit may be fixed in order to make the zooming mechanism of the first lens unit less decentered and to be advantageous for increasing the aperture ratio.

  In the zoom lens having the optical element according to the fourth example, the third lens unit has a negative refractive power, but may have a positive refractive power.

  Further, in the zoom lens having the optical elements according to the above-described embodiments, the configurations of the third group and the fourth group are shown. However, the present optical element can be applied to other group configurations such as the fifth group or the sixth group. Specifically, the zoom lens having the optical element of the present application may have a configuration in which a lens or a lens group is added on the most object side or the most image plane side. The lens group refers to a portion having at least one lens separated by an air interval.

  Further, the present optical element may be fixed so that the main drive mechanism can be arranged on the fixed cylinder. With this configuration, the assembly adjustment can be simplified.

  In addition, the optical element of the present application can be applied to autofocus as a focusing lens group for focusing from an object point at infinity to an object point at a short distance. It is also suitable for driving with a sonic motor. In particular, in the optical element of the present application, at least a part of the optical element is preferably a focusing lens group.

  Further, in the optical element of the present application, an image generated by camera shake by moving the anti-vibration lens group so as to include a component perpendicular to the optical axis, or rotating (swinging) in an in-plane direction including the optical axis. It can also be configured to correct blurring.

  The lens surface of the lens constituting the optical element of the present application may be a spherical surface, a flat surface, or an aspheric surface. When the lens surface is a spherical surface or a flat surface, it is preferable because lens processing and assembly adjustment are easy, and deterioration of optical performance due to errors in lens processing and assembly adjustment can be prevented. Further, even when the image plane is deviated, it is preferable because there is little deterioration in drawing performance. When the lens surface is aspherical, any of aspherical surface by grinding, glass mold aspherical surface in which glass is molded into an aspherical shape, or composite aspherical surface in which resin provided on the glass surface is formed in an aspherical shape Good. The lens surface may be a diffractive surface, and the lens may be a gradient index lens (GRIN lens) or a plastic lens.

  In the optical element of the present application, it is preferable that the aperture stop is disposed in front of or behind the first partial group of the optical element. However, a lens frame may be used as a substitute for the aperture stop without providing a member. Good.

  Further, an antireflection film having high transmittance in a wide wavelength range may be applied to the lens surface of the lens constituting the optical element of the present application. Thereby, flare and ghost can be reduced, and high optical performance with high contrast can be achieved.

  The imaging optical system having the optical element of the present embodiment has a zoom ratio of about 2.5 to 7.0.

  In the imaging optical system having the optical element of the present application, the first lens group may have one positive lens component, but the first lens group preferably has two positive lens components.

  In the imaging optical system having the optical element of the present application, the second lens group may have two negative lens components, but the second lens group preferably has three negative lens components.

  In the imaging optical system having the optical element of the present application, the rear group preferably has three positive lens components. In the rear group, it is preferable to arrange the lens components in order of positive / negative / positive from the object side with an air gap interposed therebetween.

  In the imaging optical system having the optical element of the present application, it is preferable that the second lens group has one negative lens component.

  In the imaging optical system having the optical element of the present application, the third lens group may have one negative lens component, but the third lens group preferably has two negative lens components.

  In the imaging optical system having the optical element of the present application, it is preferable that the fourth lens group has three positive lens components. In the fourth lens group, it is preferable to arrange the lens components in order of positive / negative / positive from the object side with an air gap therebetween.

  Next, a camera equipped with a zoom lens having an optical element according to an embodiment will be described with reference to the drawings. FIG. 16 shows an electronic still camera equipped with a zoom lens having an optical element according to the embodiment, where (a) shows a front view and (b) shows a rear view. FIG. 17 is a cross-sectional view taken along the line AA in FIG.

  16 and 17, in the electronic still camera 1 (hereinafter simply referred to as a camera), when a power button (not shown) is pressed, a shutter (not shown) of the photographic lens 2 is opened, and light from a subject (not shown) emits light from the photographic lens. 2 is focused and imaged on an image sensor C (for example, CCD, CMOS, etc.) disposed on the image plane I. The subject image formed on the image sensor C is displayed on the liquid crystal monitor 3 disposed on the back surface of the camera 1. The photographer determines the composition of the subject image while looking at the liquid crystal monitor 3, and then presses the release button 4 to photograph the subject image with the image sensor C, and records and saves it in a memory (not shown). At this time, blurring of the camera 1 caused by camera shake or the like is detected by an angular velocity sensor (not shown) built in the camera 1 or the taking lens barrel, and an optical device disposed on the taking lens 2 by an anti-vibration mechanism (not shown). The third partial group Gr3 of the element Oc is shifted in the direction perpendicular to the optical axis of the taking lens 2 to correct image blur on the image plane I caused by camera shake.

  The taking lens 2 is composed of a zoom lens having the optical element according to the embodiment. The camera 1 also includes an auxiliary light emitting unit 5 that emits auxiliary light when the subject is dark, and a zoom lens that is the photographing lens 2 when zooming from the wide-angle end state (W) to the telephoto end state (T). A wide (W) -tele (T) button 6 and function buttons 7 used for setting various conditions of the camera 1 are arranged.

  Thus, the camera 1 incorporating the zoom lens having the optical element according to the embodiment is configured.

  Hereinafter, the outline of the manufacturing method of the optical element of this application is demonstrated based on FIG. FIG. 18 is a diagram showing a method for manufacturing the optical element of the present application.

  In the optical element manufacturing method of the present application, in order from the object side, a first partial group having a positive refractive power, a second partial group having a positive refractive power, a third partial group having a negative refractive power, and a fourth part having a positive refractive power. A method of manufacturing an optical element having positive refractive power having a partial group, and includes steps S1 and S2 shown in FIG.

Step S1:
Step S1 includes, in order from the object side, a first partial group having positive refractive power, a second partial group having positive refractive power, a third partial group having negative refractive power, and a fourth partial group having positive refractive power. The optical member is disposed in a cylindrical barrel.

Step S2:
Step S2 is a mechanism for moving the first partial group along the optical axis when focusing from an object point at infinity to an object point at a short distance;
When the image shift is performed on the image plane, a mechanism for moving the third partial group so as to include a component in a direction orthogonal to the optical axis is disposed.

  According to such a method for manufacturing an optical element of the present application, an optical element having both a focusing lens and an anti-vibration lens, the imaging optical system having the optical element can be miniaturized, and high imaging can be achieved. Optical elements can be produced that provide performance.

  In addition, each said Example has shown the specific example of this invention, and this invention is not limited to these.

G1 1st lens group G2 2nd lens group G3 3rd lens group Gr Rear group Oc Optical element Gr1 1st partial group Gr2 2nd partial group Gr3 3rd partial group Gr4 4th partial group I Image plane 1 Electronic still camera 2 Imaging Lens (zoom lens)

Claims (8)

Used in an imaging optical system having a plurality of lens groups, the plurality of lens groups change in the optical axis direction between adjacent lens groups upon zooming from the wide-angle end state to the telephoto end state,
Used in a lens group having a positive refractive power arranged on the image side from the most object side lens group in the imaging optical system,
In order from the object side, it has a first partial group of positive refractive power, a second partial group of positive refractive power, a third partial group of negative refractive power, and a fourth partial group of positive refractive power,
During the zooming, the optical axis direction interval between the first partial group and the second partial group is fixed,
The distance in the optical axis direction between the second partial group and the third partial group and the distance in the optical axis direction between the third partial group and the fourth partial group are always fixed,
Focusing from an infinite object point to a short distance object point by moving the first subgroup along the optical axis,
Moving the third partial group so as to include a component in a direction perpendicular to the optical axis;
An optical element having positive refractive power as a whole. The optical element according to claim 1 , wherein the second subgroup includes at least three positive lenses and at least one negative lens. The optical element of claim 1 or 2, characterized in that the following condition is satisfied.
0.60 <Fb1 / Fb234 <1.70
However,
Fb1: Focal length of the first partial group Fb234: Composite focal length of the second partial group, the third partial group, and the fourth partial group The optical element according to any one of claims 1 to 3 , wherein the following condition is satisfied.
0.60 <(Fb1 + Fb234) × Fb0 / (Fb1 × Fb234) <1.40
However,
Fb1: Focal length of the first partial group Fb234: Composite focal length of the second partial group, the third partial group, and the fourth partial group Fb0: Focal length of the optical element at the time of focusing on infinity The optical element according to claim 1, any one of 4, characterized by satisfying the following conditions:.
| Fall / Ff | <1.30
However,
Fall: focal length of the imaging optical system at the telephoto end and at infinity focus Ff: the most image side lens of the first partial group and all the lenses arranged on the object side from the image side lens combined focal length upon focusing telephoto end and infinity constructed the optical system in Wherein the first portion the object side or the image side adjacent positions group, the optical element according to claim 1, any one of 5, characterized in that the aperture stop is disposed. Optical apparatus comprising the optical element according to any one of claims 1 to 6. Used in an imaging optical system having a plurality of lens groups, the plurality of lens groups change in the optical axis direction between adjacent lens groups upon zooming from the wide-angle end state to the telephoto end state,
Used in a lens group having a positive refractive power arranged on the image side from the most object side lens group in the imaging optical system,
In order from the object side, a positive refractive power having a first partial group having positive refractive power, a second partial group having positive refractive power, a third partial group having negative refractive power, and a fourth partial group having positive refractive power In the method of manufacturing an optical element,
At the time of zooming, an interval in the optical axis direction between the first partial group and the second partial group is fixed,
The optical axis direction interval between the second partial group and the third partial group and the optical axis direction interval between the third partial group and the fourth partial group are always fixed,
Focusing from an infinite object point to a short distance object point by moving the first subgroup along the optical axis,
In order from the object side, the first partial group of positive refractive power, the second partial group of positive refractive power, A method of manufacturing an optical element, comprising disposing a third partial group of refractive power and a fourth partial group of positive refractive power.

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