JPH1152242A - Zoom lens having hand shake correcting function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a burden to a hand shake correction driving system and to obtain excellent optical performance even when a large hand shake is generated by making a lens group comparatively light in weight a hand shake correcting group. SOLUTION: This zoom lens has five components of positive, negative, positive, positive and negative and hand shake correction is performed by making a third group Gr3 composed of a positive lens and a negative lense, eccentric in the perpendicular direction to an optical axis. The moving sensitivity of a hand shake correcting group for every focal distance in zooming is stipulated and the ratio of a final group to a focal distance at a wide-angle end (W) is stipulated. Namely, in this case, the following conditions are satisfied. 8<f/ βr(1-βd)}<100, -0.8<flast/fw<-0.5, where (f) is the focal distance of a whole system, βr is the lateral magnification of all lens groups located on an image side closer than the hand shake correcting group, βd is the lateral magnification of the hand shake correcting group, flast is the focal distance of a final group and fw is the focal distance of the whole system at the wide-angle end.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zoom lens having a camera shake correction function, and more particularly, to a lens capable of preventing image blur due to camera shake (for example, vibration during hand-held shooting of a camera). The present invention relates to a zoom lens having a camera shake correction function suitable for a shutter camera.

[0002]

2. Description of the Related Art Heretofore, most of photographing failures have been caused by camera shake and blurring. However, in recent years, the autofocus mechanism has been adopted in almost all cameras, and as the focus accuracy of the autofocus mechanism has been improved, the failure in photographing due to out-of-focus has been almost eliminated. On the other hand, the lens that comes standard with the camera is
There is a shift from single focus lenses to zoom lenses.
As a result, it is not an exaggeration to say that the cause of photographing failure is due to camera shake. Therefore, a camera shake correction function has become indispensable for a zoom lens.

[0003] In response to such a problem, various zoom lenses have been proposed. For example, JP-A-8-10136
Japanese Patent Laid-Open Publication No. 2 (1998) -214566 proposes a zoom lens that corrects camera shake by dividing a fourth group of five-component zoom of positive, negative, positive, positive, and negative into three and decentering a middle lens group in parallel. I have. JP-A-6-265827 discloses that a positive
A zoom lens has been proposed which divides a second group of positive and negative three-component zoom into a front group and a rear group, and performs camera shake correction by decentering the rear group in parallel. JP-A-7-3188
Japanese Patent Application Laid-Open No. 65-26564 proposes a zoom lens that performs camera shake correction by performing parallel eccentricity on a fourth unit of a five-component zoom of positive, negative, positive, positive, and negative. JP-A-6-13020
In Japanese Patent Application Publication No. 3 (1999) -1995, there is proposed a zoom lens in which a second group of three component zooms of positive, positive, and negative is configured by a lens group in which a transparent liquid is sealed, and the lens group is tilted to perform camera shake correction.

[0004]

However, in the zoom lens proposed in Japanese Patent Application Laid-Open Nos. 8-101362, 6-265827 and 7-318865, an on-axis image is not corrected when camera shake is corrected. There is a difference between the movement of the point and the movement of the off-axis image point. For this reason,
There has been a problem that an off-axis image point largely moves and good optical performance cannot be obtained. Also, JP-A-6-130203
In the zoom lens proposed in Japanese Patent Application Laid-Open Publication No. H11-27095, axial chromatic aberration occurs when the lens group in which the transparent liquid is sealed is tilted to perform camera shake correction. It is difficult to correct the chromatic aberration on the axis, and there is a problem that good imaging performance cannot be obtained.

The present invention has been made in view of such a situation, and a relatively light lens group is used as a camera shake correction group to reduce a load on a camera shake correction drive system and generate a large camera shake. It is an object of the present invention to provide a zoom lens having a camera shake correction function capable of obtaining good optical performance even in the case where the zooming is performed.

[0006]

In order to achieve the above object, a zoom lens having a camera shake correction function according to a first aspect of the present invention includes, in order from an object side, a first lens unit having a positive power and a negative lens having a negative power. A zoom lens comprising a second group, a third group having a positive power, and a final group having a negative power closest to the image side, wherein the third group has at least one positive lens. And at least one negative lens. The third group is decentered in the vertical direction with respect to the optical axis to perform camera shake correction, and the following conditional expression (1) )
Further, it is characterized by satisfying the following conditional expression (2). 8 <f / {βr × (1-βd)} <100 (1) -0.8 <flast / fw <-0.5 (2) where f: focal length of the entire system, βr: image rather than camera shake correction group Is the lateral magnification of all the lens groups located on the side, βd is the lateral magnification of the camera shake correction group, flast is the focal length of the last group, and fw is the focal length of the entire system at the wide-angle end.

According to a second aspect of the present invention, there is provided a zoom lens having a camera shake correcting function, comprising a first lens having a positive power in order from an object side.
A zoom lens comprising a group, a second group having a negative power, and a third group having a positive power, and a final group having a negative power closest to the image side. The group consists of a front group and a rear group in order from the object side, and the front group is a camera shake correction group having at least one positive lens and at least one negative lens. It is characterized in that camera shake correction is performed by decentering in the vertical direction, and the following conditional expression (1) is satisfied at any position in zooming, and the following conditional expression (2) is satisfied. 8 <f / {βr × (1-βd)} <100 (1) -0.8 <flast / fw <-0.5 (2) where f: focal length of the entire system, βr: image rather than camera shake correction group Is the lateral magnification of all the lens groups located on the side, βd is the lateral magnification of the camera shake correction group, flast is the focal length of the last group, and fw is the focal length of the entire system at the wide-angle end.

According to a third aspect of the present invention, there is provided a zoom lens having a camera shake correction function according to the first or second aspect of the invention.
In focusing from an infinitely distant object to a close object, the second lens unit is moved toward the object side.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A zoom lens having a camera shake correction function according to the present invention will be described below with reference to the drawings. 1 to 4 are lens configuration diagrams corresponding to the zoom lenses according to the first to fourth embodiments, respectively.
The lens arrangement at [W] is shown. Arrows mi (i = 1, 2, 3,...) In each lens configuration diagram schematically show movement of the i-th lens unit (Gri) during zooming from the wide-angle end [W] to the telephoto end [T]. Is shown in In each lens configuration diagram, ri (i = 1,2,
The surface marked with (3, ...) is the i-th surface counted from the object side, and the surface marked with * in ri is an aspheric surface. di (i = 1,2,
The axial top surface interval between the groups denoted by (3,...) Is a variable interval that changes during zooming, of the i-th axial top surface interval counted from the object side. 1 to 4, an arrow mD indicates the parallel eccentricity of the camera shake correction group (that is, a movement in a direction perpendicular to the optical axis), and an arrow mF indicates the focus movement of the focus group.

Each of the zoom lenses according to the first to third embodiments has, in order from the object side, a first lens having a positive power.
Group (Gr1), second group (Gr2) with negative power, third group (Gr3) with positive power, and fourth group with positive power
(Gr4) and a fifth lens unit (Gr5) having negative power. As shown by arrows m1 to m5 in FIGS. 1 to 3, at the time of zooming from the wide-angle end [W] to the telephoto end [T], the distance between the first unit (Gr1) and the second unit (Gr2). Becomes wider, the interval between the second group (Gr2) and the third group (Gr3) becomes narrower, and the fourth group (Gr3) becomes
Each group moves so that the distance between r4) and the fifth group (Gr5) becomes narrow. The most image-side surface of the second group (Gr2) and the third group (Gr2)
An aperture (S) that zooms together with the third lens unit (Gr3) is disposed between the third lens unit (Gr3) and the most object side surface of (3).

The zoom lens according to the fourth embodiment has, in order from the object side, a first lens unit (Gr1) having a positive power, a second lens unit (Gr2) having a negative power, and a positive lens. The zoom lens includes a third lens unit (Gr3) and a fourth lens unit (Gr4) having negative power. Then, as shown by arrows m1 to m4 in FIG. 4, during zooming from the wide-angle end [W] to the telephoto end [T], the distance between the first unit (Gr1) and the second unit (Gr2) increases. The distance between the second group (Gr2) and the third group (Gr3) is reduced, and the third group (Gr3)
Each group moves so that the distance between r3) and the fourth group (Gr4) becomes narrow. The most image-side surface of the second group (Gr2) and the third group (Gr2)
An aperture (S) that zooms together with the third lens unit (Gr3) is disposed between the third lens unit (Gr3) and the most object side surface of (3).

In the first to third embodiments, each group is configured as follows in order from the object side. Group 1 (G
r1) is composed of a negative meniscus lens convex on the object side and a positive lens convex on the object side. The second group (Gr2)
It is composed of a biconcave negative lens and a positive lens convex on the object side. The third unit (Gr3) includes a biconvex positive lens and a negative lens concave on the image side. The fourth group (Gr4)
It consists of a biconvex positive cemented lens. 5th group (Gr5)
Is a positive lens convex on the image side, a negative lens concave on the object side,
It is composed of

In the fourth embodiment, each group is configured as follows in order from the object side. First group (Gr1)
Is composed of a negative meniscus lens convex on the object side and a positive lens convex on the object side. The second group (Gr2) includes a biconcave negative lens and a positive lens convex on the object side. The third group (Gr3) includes a biconvex positive lens, a negative lens concave on the image side, and a biconvex positive cemented lens. The fourth group (Gr4) includes a positive lens convex on the image side and a negative lens concave on the object side.

In the first to fourth embodiments, a first lens unit (Gr1) having a positive power, a second lens unit (Gr2) having a negative power, and a positive lens having a positive power are arranged in order from the object side. 3rd group (Gr3)
, And a negative lens group closest to the image side. In order to perform zooming by changing the interval between at least four zoom groups,
It has at least three zoom groups. In this case, since the zooming can be shared by at least three groups, it is possible to realize the high-power zoom by sharing the aberration correction of each group. In addition, since the configuration is a telephoto type as a whole, a compact optical system with a small lens back can be realized.

As in the first to fourth embodiments, in order from the object side, a first unit (Gr1) having a positive power, a second unit (Gr2) having a negative power, The third with
And a final lens group having a negative power closest to the image side, and a third lens unit (Gr3) as in the first to third embodiments. A third group that performs camera shake correction by decentering in the direction perpendicular to the optical axis.
A zoom lens configuration in which (Gr3) is a camera shake correction group (hereinafter, referred to as a “first zoom configuration”), or as in the fourth embodiment, a third group (Gr3) is sequentially arranged from the object side to the front group. (GrA)
And a rear group (GrB), which performs camera shake correction by decentering the front group (GrA) in a direction perpendicular to the optical axis.
rA) is a zoom lens configuration (hereinafter referred to as “second
The zoom configuration. " In (2), it is desirable that the following conditional expression (1) be satisfied at an arbitrary position in zooming. 8 <f / {βr × (1-βd)} <100 (1) where, f: focal length of the entire system, βr: lateral magnification of all lens groups located on the image side of the camera shake correction group {for example, In the first embodiment, the lateral magnification of the fourth group (Gr4) and the fifth group (Gr5)}, βd: the lateral magnification of the camera shake correction group {for example, in the first embodiment, the lateral magnification of the third group (Gr3) Lateral magnification}.

Conditional expression (1) defines the movement sensitivity of the camera shake correction group for each focal length. When the value exceeds the upper limit of the conditional expression (1), the movement amount of the camera shake correction group becomes too large.
The lens diameter of the camera shake correction unit must be increased. Therefore, there is a problem that the optical system becomes large. If the lower limit of conditional expression (1) is exceeded, the amount of movement of the camera shake correction group will be too small, and it will be necessary to control the position accuracy of the camera shake correction group with high accuracy when driving the camera shake correction group. Therefore, high-performance driving means and position detecting means are required, so that the cost is increased.

In the first and second zoom configurations, it is desirable that the following conditional expression (2) is satisfied. -0.8 <flast / fw <-0.5 (2) where flast is the focal length of the last lens unit, and fw is the focal length of the entire system at the wide-angle end [W].

Condition (2) defines the ratio between the last lens unit and the focal length at the wide-angle end [W]. When the value exceeds the upper limit of conditional expression (2), the power of the final lens unit becomes too strong, so that aberration (particularly, curvature of field) generated in the final lens unit becomes too large, so that good optical performance cannot be obtained. If the lower limit of conditional expression (2) is exceeded, the power of the final lens group becomes weak, which is advantageous for aberration correction.However, since the degree of telephoto becomes small and the optical system becomes too large, a compact optical system can be obtained. become unable.

In the first to fourth embodiments, the second lens unit (Gr2) is moved to the object side as shown by the arrow mF (FIGS. 1 to 4), so that the object from the object at infinity to the nearby object is moved. Focusing is performed. Image stabilization is performed in the third group (G
Since this is performed in r3), focusing and camera shake correction can be performed by separate lens groups. Also focus group
Since there is a camera shake correction group (Gr3 or GrA) on the image side than (Gr2), the magnification of the camera shake correction group does not change depending on the shooting distance,
Therefore, the amount of movement of the camera shake correction group can be made constant.

In the first and second zoom configurations,
It is desirable to satisfy the following conditional expression (3). 0.1 <Bfw / Yim <0.25 (3) where Bfw is the back focus at the wide-angle end [W], and Yim is the screen diagonal length.

Conditional expression (3) defines the ratio between the lens back at the wide angle end [W] and the screen diagonal length. If the upper limit of conditional expression (3) is exceeded, the back focus at the wide-angle end [W] becomes too large. Usually, the lens shutter camera is in the state of the wide-angle end [W] when carried. When the back focus becomes large, the optical system becomes large in the optical axis direction and the total length increases, which is inconvenient to carry. Conditional expression
If the lower limit of (3) is exceeded, the back focus at the wide-angle end [W] becomes too small. As the back focus decreases, the distance from the final lens to the image plane decreases. As a result, it is necessary to increase the diameter of the final lens, so that the optical system becomes large in the direction perpendicular to the optical axis.

The following conditional expression (3 ') shows a more desirable conditional range in conditional expression (3). By adopting a configuration that satisfies the conditional expression (3 ′), a more compact zoom lens having a camera shake correction function can be obtained as an optical system for a lens shutter camera. 0.13 <Bfw / Yim <0.21 (3 ')

In the first and second zoom configurations,
It is desirable to satisfy the following conditional expression (4). 0.6 <Lt / ft <1.0 (4) where Lt is the total length at the telephoto end [T], and ft is the focal length of the entire system at the telephoto end [T].

Conditional expression (4) defines the telephoto ratio at the telephoto end [T]. If the upper limit of conditional expression (4) is exceeded, the telephoto end [T]
Telephoto ratio becomes too large, which is against compactness. If the lower limit of conditional expression (4) is exceeded, the telephoto end [T]
Has a smaller overall length, but the power of each group must be increased. As a result, it becomes difficult to suppress the occurrence of aberrations generated with strong power, and it becomes impossible to obtain good optical performance.

The following conditional expression (4 ') shows a more desirable conditional range in conditional expression (4). By adopting a configuration that satisfies the conditional expression (4 ′), it is possible to obtain a more compact and high-performance zoom lens having a camera shake correction function as an optical system for a lens shutter camera. 0.7 <Lt / ft <0.8 ... (4 ')

In the first and second zoom configurations,
It is desirable to satisfy the following conditional expression (5). 4.0 <ft / fw ² × Yim <9.0 (5) where fw is the focal length of the entire system at the wide-angle end [W].

Conditional expression (5) defines the ratio between the zoom ratio and the focal length at the wide-angle end. In general, as the focal length at the wide-angle end [W] is increased, the zoom ratio can be increased and higher magnification can be achieved. When the upper limit of conditional expression (5) is exceeded,
The camera becomes large because the zoom ratio is too large. If the lower limit of conditional expression (5) is exceeded, high magnification cannot be achieved, or even at high magnification the focal length will be closer to the telephoto end. Will not fit.

When the lens is decentered during camera shake, axial lateral chromatic aberration occurs. To suppress this, it is desirable that the camera shake correction group be color-corrected. for that purpose,
It is necessary that the camera shake correction group includes at least one positive lens and at least one negative lens. In the first to third embodiments, the third group (Gr3) used as a camera shake correction group is constituted by one each of a positive lens and a negative lens. In the fourth embodiment, the camera shake correction is performed. The front group (Gr3) of the third group (Gr3) used as a group includes one positive lens and one negative lens. For this reason, axial lateral chromatic aberration during camera shake correction can be corrected, and since the camera shake correction group is composed of the minimum number of lenses required for color correction, lens weight can be minimized. Therefore, there is also an advantage that the load on the camera shake correction drive system is reduced.

From the above viewpoint, in the first zoom configuration, it is desirable that the third unit (Gr3) has at least one positive lens and at least one negative lens, and further, the following conditional expression (Gr3). It is desirable to satisfy 6). In the second zoom configuration, it is desirable that the front group (GrA) has at least one positive lens and at least one negative lens, and further satisfies the following conditional expression (6). desirable. By satisfying conditional expression (6),
The occurrence of axial lateral chromatic aberration during camera shake correction can be suppressed. νp> νn (6) where νp is the Abbe number of the positive lens in the camera shake correction group, and νn is the Abbe number of the negative lens in the camera shake correction group.

When the camera shake correction group is composed of a minimum number of images as in the first to fourth embodiments, it is desirable to provide an aspherical surface in the camera shake correction group in order to remove aberrations generated at the time of camera shake correction. By configuring the camera shake correction group with two lenses, the number of components of the camera shake correction group can be minimized. However, the design with two lenses lacks the degree of freedom in design. It becomes difficult to obtain performance. By adding an aspherical surface to the camera shake correction group, it is possible to add a further degree of freedom in design, so that good optical performance during camera shake correction can be obtained. It is desirable that the aspherical surface added to the camera shake correction group satisfies the following conditional expression (7). When the maximum effective radius of the aspheric surface added to the camera shake correction group is ymax, 0.5ymax ≦ y ≦ 1.
More preferably, the aspheric surface satisfies the following conditional expression (7) for all heights y in the optical axis vertical direction of 0ymax.

-10 <(| x | − | x0 |) / {C0 · (N′−N)} <− 0.05 (7) where | x | − | x0 |: the aspherical surface and its reference curvature Difference in the optical axis direction from the reference sphere, C0: curvature of the reference sphere (that is, reference curvature of the aspheric surface), N ': refractive index of the aspherical image-side medium, N: refractive index of the aspherical object-side medium It is.

In the conditional expression (7), x is an aspheric surface shape;
x0 represents the surface shape of the reference spherical surface, and specifically, the following formula (A
S) and (RE). x = {C0 · y ² } / {1 + √ (1-ε · C0 ² · y ² )} + Σ (Ai · y ⁱ )… (AS) x0 = {C0 · y ² } / {1 + √ (1-C0 ² · y ² )} (RE) where, in equations (AS) and (RE), y: height in the direction perpendicular to the optical axis, ε: quadratic surface parameter, Ai: i-th order The aspheric coefficient is

Conditional expression (7) represents the degree of the effect of the aspherical surface of the camera shake correction group. When the value exceeds the upper limit of the conditional expression (7), the effect of the aspheric surface of the camera shake correction group hardly appears. That is, it is difficult to suppress the occurrence of aberrations at the time of camera shake correction due to the aspherical surface of the camera shake correction group. When the value goes below the lower limit of conditional expression (7), the effect of the aspheric surface of the camera shake correction group becomes too strong, and it becomes difficult to suppress a very large aberration generated there by another factor. Therefore, satisfactory optical performance cannot be obtained.

When the lens group is moved perpendicularly to the optical axis for camera shake correction, light rays pass through where no light beam passes in a normal state (before decentering), and light rays pass in a camera shake correction state (after decentering). become. This light beam may become harmful light beam and degrade imaging performance. Therefore, it is desirable to block a harmful ray at the time of camera shake correction by providing a fixed stop on the object side of the camera shake correction group, in the camera shake correction group, or on the image side of the camera shake correction group, thereby also in the camera shake correction state. Good imaging performance can be obtained.

Each of the lens groups constituting the first to fourth embodiments is constituted only by a refraction type lens which deflects an incident light beam by refraction, but is not limited to this.
For example, each lens group may be composed of a diffractive lens that deflects an incident light beam by diffraction, a refraction / diffraction hybrid lens that deflects an incident light beam by a combination of a diffraction action and a refraction action, or the like.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A zoom lens having a camera shake correction function according to the present invention will be described more specifically with reference to construction data, aberration diagrams, and the like. Examples 1 to 4 given here as examples correspond to the first to fourth embodiments described above, respectively, and FIG. 1 showing the first to fourth embodiments.
4 to 4 show the lens configurations at the wide-angle end [W] of Examples 1 to 4, respectively.

In the construction data of each embodiment, ri (i = 1, 2, 3,...) Is the radius of curvature of the i-th surface counted from the object side, and di (i = 1, 2, 3,. ..) is the i-th shaft upper surface distance counted from the object side (shown here before the eccentricity), which is changed by zooming (variable space).
Is the actual surface distance between the groups at the wide-angle end [W] to the intermediate focal length state [M] to the telephoto end [T]. Also, Ni (i = 1,2,
3, ...) and νi (i = 1,2,3, ...) are the refractive index (Nd) and Abbe number (νd) for the d-line of the i-th lens counted from the object side.
It is. The focal length f and F number FNO of the entire system corresponding to each focal length state [W], [M], [T] are shown together with the construction data.

Also, the surface marked with * for the radius of curvature ri is:
It indicates that the surface is constituted by an aspherical surface, and is defined by the above-mentioned formula (AS) representing the surface shape of the aspherical surface. Aspherical surface data and corresponding value of conditional expression (7) regarding aspherical surface {However,
ymax: Maximum height in the direction perpendicular to the optical axis of the aspherical surface (maximum effective diameter)
It is. } Is shown together with the construction data of each embodiment, and Tables 1 to 4 show corresponding data of conditional expressions and related data of each embodiment.

Example 1 (positive / negative / positive / positive / negative)

[Aspherical surface data of the fifth surface (r5)] ε = 1.0000 A4 = -0.23226926 × 10 ^-5 A6 = 0.24289203 × 10 ^-5 A8 = -0.19328866 × 10 ^-6 A10 = 0.55259730 × 10 ^-8 A12 = -0.59688894 × 10 ^-10

[Aspherical surface data of twelfth surface (r12)] ε = 1.0000 A4 = -0.14966353 × 10 ^-3 A6 = 0.28637080 × 10 ^-5 A8 = 0.15408591 × 10 ^-6 A10 = -0.14391373 × 10 ^-7 A12 = 0.36520585 × 10 ^-9

[Aspherical surface data of the thirteenth surface (r13)] ε = 1.0000 A4 = 0.23828815 × 10 ^-3 A6 = 0.40913268 × 10 ^-5 A8 = 0.54738265 × 10 ^-6 A10 = -0.25318420 × 10 ^-7 A12 = 0.68885480 × 10 ^-9

[Aspherical surface data of the 17th surface (r17)] ε = 1.0000 A4 = 0.88752120 × 10 ^-4 A6 = -0.21184436 × 10 ^-5 A8 = -0.17095904 × 10 ^-7 A10 = 0.22562399 × 10 ^-9 A12 = -0.15753558 × 10 ^-11

[Aspherical surface data of the eighteenth surface (r18)] ε = 1.0000 A4 = -0.16495778 × 10 ^-4 A6 = -0.27860747 × 10 ^-6 A8 = -0.97662853 × 10 ^-7 A10 = 0.14249911 × 10 ^-8 A12 = -0.11663813 × 10 ^-10

[Corresponding value of conditional expression (7) on twelfth surface (r12)] y = 2.150 = 0.50ymax (| x |-| x0 |) / {C0 · (N′-N)} = − 0.22005 y = 2.580 = 0.60ymax… (| x |-| x0 |) / {C0 ・ (N'-N)} =-0.43224 y = 3.010 = 0.70ymax… (| x |-| x0 |) / {C0 ・(N'-N)} =-0.75052 y = 3.440 = 0.80ymax… (| x |-| x0 |) / {C0 ・ (N'-N)} =-1.18992 y = 3.870 = 0.90ymax… (| x |-| x0 |) / {C0 ・ (N'-N)} =-1.75645 y = 4.300 = 1.00ymax… (| x |-| x0 |) / {C0 ・ (N'-N)} =-2.41874

[Corresponding value of conditional expression (7) on the thirteenth surface (r13)] y = 2.100 = 0.50ymax ... (| x |-| x0 |) / {C0 · (N′-N)} = − 0.09598 y = 2.520 = 0.60ymax… (| x |-| x0 |) / {C0 ・ (N'-N)} =-0.21098 y = 2.940 = 0.70ymax… (| x |-| x0 |) / {C0 ・(N'-N)} =-0.42016 y = 3.360 = 0.80ymax… (| x |-| x0 |) / {C0 ・ (N'-N)} =-0.78075 y = 3.780 = 0.90ymax… (| x |-| x0 |) / {C0 • (N'-N)} =-1.38119 y = 4.200 = 1.00ymax… (| x |-| x0 |) / {C0 • (N'-N)} =-2.36679

<< Embodiment 2 (positive / negative / positive / positive / negative) >>

[Aspherical surface data of fifth surface (r5)] ε = 1.0000 A4 = 0.10111289 × 10 ^-3 A6 = 0.21505482 × 10 ^-7 A8 = -0.87414283 × 10 ^-7 A10 = 0.21612691 × 10 ^-8 A12 =- 0.13584310 × 10 ^-10

[Aspherical surface data of twelfth surface (r12)] ε = 1.0000 A4 = -0.14403947 × 10 ^-3 A6 = 0.69288421 × 10 ^-5 A8 = 0.20236022 × 10 ^-6 A10 = -0.53419421 × 10 ^-8 A12 = -0.29533142 × 10 ^-9

[Aspherical surface data of the thirteenth surface (r13)] ε = 1.0000 A4 = 0.44525941 × 10 ^-3 A6 = 0.13592128 × 10 ^-4 A8 = 0.40128381 × 10 ^-6 A10 = 0.16002588 × 10 ^-7 A12 = -0.65528297 × 10 ^-10

[Aspherical surface data of the 17th surface (r17)] ε = 1.0000 A4 = 0.84835506 × 10 ^-4 A6 = -0.57112122 × 10 ^-5 A8 = 0.76284527 × 10 ^-8 A10 = 0.10258861 × 10 ^-8 A12 =- 0.54191954 × 10 ^-11

[Aspherical surface data of the eighteenth surface (r18)] ε = 1.0000 A4 = -0.22838633 × 10 ^-4 A6 = -0.51555924 × 10 ^-5 A8 = 0.41095423 × 10 ^-7 A10 = -0.88630934 × 10 ^-9 A12 = 0.80173768 × 10 ^-11

[Corresponding value of conditional expression (7) on twelfth surface (r12)] y = 2.150 = 0.50ymax (| x |-| x0 |) / {C0 · (N′-N)} = − 0.09096 y = 2.580 = 0.60ymax… (| x |-| x0 |) / {C0 ・ (N'-N)} =-0.15860 y = 3.010 = 0.70ymax… (| x |-| x0 |) / {C0 ・(N'-N)} =-0.22774 y = 3.440 = 0.80ymax… (| x |-| x0 |) / {C0 ・ (N'-N)} =-0.26603 y = 3.870 = 0.90ymax… (| x |-| x0 |) / {C0 ・ (N'-N)} =-0.24395 y = 4.300 = 1.00ymax… (| x |-| x0 |) / {C0 ・ (N'-N)} =-0.20188

[Corresponding value of conditional expression (7) on the thirteenth surface (r13)] y = 2.100 = 0.50ymax (| x | − | x0 |) / {C0 · (N′-N)} = − 0.25192 y = 2.520 = 0.60ymax… (| x |-| x0 |) / {C0 ・ (N'-N)} =-0.56037 y = 2.940 = 0.70ymax… (| x |-| x0 |) / {C0 ・(N'-N)} =-1.13400 y = 3.360 = 0.80ymax… (| x |-| x0 |) / {C0 ・ (N'-N)} =-2.15643 y = 3.780 = 0.90ymax… (| x |-| x0 |) / {C0 ・ (N'-N)} =-3.93506 y = 4.200 = 1.00ymax… (| x |-| x0 |) / {C0 ・ (N'-N)} =-6.98538

<< Embodiment 3 (Positive / Negative / Positive / Positive / Negative) >>

[Aspherical surface data of fifth surface (r5)] ε = 1.0000 A4 = 0.44102 260 × 10 ^-4 A6 = 0.13060845 × 10 ^-5 A8 = -0.12149621 × 10 ^-6 A10 = 0.31977675 × 10 ^-8 A12 =- 0.30665015 × 10 ^-10

[Aspherical surface data of twelfth surface (r12)] ε = 1.0000 A4 = -0.11014643 × 10 ^-3 A6 = 0.36957163 × 10 ^-5 A8 = 0.34919248 × 10 ^-6 A10 = -0.15077736 × 10 ^-7 A12 = 0.99586085 × 10 ^-10

[Aspherical surface data of the thirteenth surface (r13)] ε = 1.0000 A4 = 0.33602127 × 10 ^-3 A6 = 0.11652681 × 10 ^-4 A8 = 0.28498565 × 10 ^-6 A10 = 0.23550 255 × 10 ^-8 A12 = 0.15881534 × 10 ^-9

[Aspherical surface data of the 17th surface (r17)] ε = 1.0000 A4 = -0.12540073 × 10 ^-4 A6 = -0.38323764 × 10 ^-5 A8 = 0.48272704 × 10 ^-8 A10 = 0.18319485 × 10 ^-10 A12 = 0.27778381 × 10 ^-11

[Aspherical surface data of the eighteenth surface (r18)] ε = 1.0000 A4 = -0.11335 230 × 10 ^-3 A6 = -0.36221525 × 10 ^-5 A8 = 0.16449921 × 10 ^-8 A10 = -0.33786813 × 10 ^-9 A12 = 0.98664015 × 10 ^-12

[Corresponding value of conditional expression (7) on twelfth surface (r12)] y = 2.150 = 0.50ymax (| x | − | x0 |) / {C0 · (N′-N)} = − 0.10285 y = 2.580 = 0.60ymax… (| x |-| x0 |) / {C0 ・ (N'-N)} =-0.18211 y = 3.010 = 0.70ymax… (| x |-| x0 |) / {C0 ・(N'-N)} =-0.26574 y = 3.440 = 0.80ymax… (| x |-| x0 |) / {C0 ・ (N'-N)} =-0.31398 y = 3.870 = 0.90ymax… (| x |-| x0 |) / {C0 ・ (N'-N)} =-0.27427 y = 4.300 = 1.00ymax… (| x |-| x0 |) / {C0 ・ (N'-N)} =-0.11538

[Corresponding value of conditional expression (7) on the thirteenth surface (r13)] y = 2.100 = 0.50ymax ... (| x |-| x0 |) / {C0 · (N′-N)} = − 0.15236 y = 2.520 = 0.60ymax… (| x |-| x0 |) / {C0 ・ (N'-N)} =-0.33937 y = 2.940 = 0.70ymax… (| x |-| x0 |) / {C0 ・(N'-N)} =-0.68539 y = 3.360 = 0.80ymax… (| x |-| x0 |) / {C0 ・ (N'-N)} =-1.29477 y = 3.780 = 0.90ymax… (| x |-| x0 |) / {C0 • (N'-N)} =-2.33561 y = 4.200 = 1.00ymax… (| x |-| x0 |) / {C0 • (N'-N)} =-4.08289

Embodiment 4 (Positive / Negative / Positive / Negative)

[Aspherical surface data of fifth surface (r5)] ε = 1.0000 A4 = -0.56466397 × 10 ^-5 A6 = 0.23541041 × 10 ^-5 A8 = -0.18607380 × 10 ^-6 A10 = 0.51965024 × 10 ^-8 A12 = -0.54259401 × 10 ^-10

[Aspherical surface data of twelfth surface (r12)] ε = 1.0000 A4 = -0.13681632 × 10 ^-3 A6 = 0.40347946 × 10 ^-5 A8 = 0.21406378 × 10 ^-6 A10 = -0.13217151 × 10 ^-7 A12 = 0.21490713 × 10 ^-9

[Aspherical surface data of the thirteenth surface (r13)] ε = 1.0000 A4 = 0.26667577 × 10 ^-3 A6 = 0.71599621 × 10 ^-5 A8 = 0.61486343 × 10 ^-6 A10 = -0.26183906 × 10 ^-7 A12 = 0.78268536 × 10 ^-9

[Aspherical surface data of the 17th surface (r17)] ε = 1.0000 A4 = 0.78470218 × 10 ^-4 A6 = -0.35112216 × 10 ^-5 A8 = -0.20703399 × 10 ^-7 A10 = 0.12008926 × 10 ^-9 A12 = 0.12261269 × 10 ^-11

[Aspherical surface data of the eighteenth surface (r18)] ε = 1.0000 A4 = 0.36409028 × 10 ^-5 A6 = -0.19544500 × 10 ^-5 A8 = -0.11133922 × 10 ^-6 A10 = 0.15788545 × 10 ^-8 A12 = -0.11258060 × 10 ^-10

[Corresponding value of conditional expression (7) on twelfth surface (r12)] y = 2.150 = 0.50ymax ... (| x |-| x0 |) / {C0 · (N′-N)} = − 0.23764 y = 2.580 = 0.60ymax… (| x |-| x0 |) / {C0 ・ (N'-N)} =-0.44620 y = 3.010 = 0.70ymax… (| x |-| x0 |) / {C0 ・(N'-N)} =-0.72421 y = 3.440 = 0.80ymax… (| x |-| x0 |) / {C0 ・ (N'-N)} =-1.04163 y = 3.870 = 0.90ymax… (| x |-| x0 |) / {C0. (N'-N)} =-1.34642 y = 4.300 = 1.00ymax (| x |-| x0 |) / {C0. (N'-N)} =-
1.57190

[Corresponding value of conditional expression (7) on the thirteenth surface (r13)] y = 2.100 = 0.50ymax (| x | − | x0 |) / {C0 · (N′−N)} = − 0.10681 y = 2.520 = 0.60ymax… (| x |-| x0 |) / {C0 ・ (N'-N)} =-0.23819 y = 2.940 = 0.70ymax… (| x |-| x0 |) / {C0 ・(N'-N)} =-0.48182 y = 3.360 = 0.80ymax… (| x |-| x0 |) / {C0 ・ (N'-N)} =-0.91042 y = 3.780 = 0.90ymax… (| x |-| x0 |) / {C0 • (N'-N)} =-1.63959 y = 4.200 = 1.00ymax… (| x |-| x0 |) / {C0 • (N'-N)} =-2.86276

[0071]

[Table 1]

[0072]

[Table 2]

[0073]

[Table 3]

[0074]

[Table 4]

FIGS. 5 to 12 show the aberration performance before decentering (normal state) of each embodiment. FIGS. 5, 7, 9, and 11
FIGS. 6, 8, 10, and 1 are longitudinal aberration diagrams of Examples 1 to 4 before decentering (normal state) and in an infinity shooting state.
2 is a longitudinal aberration diagram of Examples 1 to 4 before decentering and in a close-up shooting state (a shooting distance of 50 cm). 5 to 12,
[W] is the wide-angle end, [M] is the intermediate focal length state (middle), [T]
Indicates various aberrations at the telephoto end (in order from the left, spherical aberration and the like, astigmatism, distortion; Y ′: image height), the solid line (d) indicates the aberration with respect to the d-line, and the broken line (SC) indicates the sine condition. The dashed line (DM) and the solid line (DS) represent astigmatism with respect to the d-line on the meridional surface and the sagittal surface, respectively.

FIGS. 13 to 24 show the aberration performance before eccentricity (normal state) and after eccentricity (camera shake correction state) of each embodiment. 13 to 24 are lateral aberration diagrams before and after eccentricity, in infinity shooting state, and on the meridional surface in each embodiment.
15 to 15 show the first embodiment, and FIGS. 16 to 18 show the second embodiment, FIG.
FIGS. 9 to 21 correspond to the third embodiment, and FIGS. 22 to 24 correspond to the fourth embodiment, respectively.
2 is the wide-angle end [W], FIG. 14, FIG. 17, FIG. 20 and FIG.
Indicates an intermediate focal length state (middle) [M], and FIGS. 15, 18, 21 and 24 respectively correspond to the telephoto end [T].
13 to 24, [A] indicates a camera shake correction state of 0.7 degrees {the camera shake correction angle θ of the camera shake correction group θ = 0.7 ° (= 0.012217).
FIG. 3B is a lateral aberration diagram at an image height Y ′ = + 12, 0, -12 in a correction state of 3 rad), and [B] is a lateral aberration diagram at an image height Y ′ = + 12, 0 in a normal state. .

[0077]

As described above, according to the present invention, a sufficient load is not imposed on the camera shake correction drive system, and sufficient optical performance can be obtained not only in the normal state but also in the camera shake correction state when a large camera shake occurs. A compact zoom lens having a compact camera shake correction function can be realized.

[Brief description of the drawings]

FIG. 1 is a lens configuration diagram of a first embodiment (Example 1).

FIG. 2 is a lens configuration diagram of a second embodiment (Example 2).

FIG. 3 is a lens configuration diagram of a third embodiment (Example 3).

FIG. 4 is a lens configuration diagram of a fourth embodiment (Example 4).

FIG. 5 is a longitudinal aberration diagram of Example 1 in an infinity shooting state before decentering.

FIG. 6 shows a close-up photographing state (photographing distance 5) before eccentricity in the first embodiment.
0 cm).

FIG. 7 is a longitudinal aberration diagram of Embodiment 2 in an infinity shooting state before decentering.

FIG. 8 shows a close-up photographing state (with a photographing distance of 5 before eccentricity in Example 2).
0 cm).

FIG. 9 is a longitudinal aberration diagram of Example 3 in an infinity shooting state before decentering.

FIG. 10 is a longitudinal aberration diagram in a close-up shooting state (a shooting distance of 50 cm) before decentering according to the third embodiment.

FIG. 11 is a longitudinal aberration diagram of Example 4 in an infinity shooting state before decentering.

FIG. 12 is a longitudinal aberration diagram of Example 4 in a close-up shooting state (a shooting distance of 50 cm) before decentering.

FIG. 13 is a meridional lateral aberration diagram before and after decentering, at a wide-angle end, and at infinity, according to the first embodiment.

FIG. 14 is a meridional lateral aberration diagram before and after eccentricity, middle, and infinity in Example 1;

FIG. 15 is a meridional lateral aberration diagram before and after eccentricity, at a telephoto end, and at infinity in Example 1;

FIG. 16 is a meridional lateral aberration diagram before and after decentering, at the wide-angle end, and at infinity in Example 2;

FIG. 17 is a meridional lateral aberration diagram before and after decentering, middle, and infinity photographing in Example 2.

FIG. 18 is a meridional lateral aberration diagram before and after eccentricity, at a telephoto end, and at infinity in Example 2;

FIG. 19 is a meridional lateral aberration diagram before and after decentering, at a wide-angle end, and at infinity in Example 3;

FIG. 20 is a view showing meridional lateral aberrations before and after decentering, middle, and infinity photographing in Example 3;

FIG. 21 is a meridional lateral aberration diagram before and after decentering, at a telephoto end, and at infinity, according to a third embodiment.

FIG. 22 is a view showing meridional lateral aberrations before and after decentering, at the wide-angle end, and at infinity in Example 4;

FIG. 23 is a view showing meridional lateral aberrations before and after eccentricity, middle, and infinity photographing in Example 4.

FIG. 24 is a meridional lateral aberration diagram before and after eccentricity, at a telephoto end, and at infinity in Example 4;

[Explanation of symbols]

 Gr1 ... first group Gr2 ... second group Gr3 ... third group Gr4 ... fourth group Gr5 ... fifth group GrA ... front group GrB ... rear group S ... diaphragm

Claims (3)

[Claims] 1. An image processing apparatus comprising: a first unit having a positive power, a second unit having a negative power, and a third unit having a positive power, in order from the object side. A zoom lens comprising a last group having power, wherein the third group includes at least one positive lens and at least one positive lens.
This is a camera shake correction group having three negative lenses.
Perform camera shake correction by decentering the group in the vertical direction with respect to the optical axis, and satisfy the following conditional expression (1) at any position in zooming and satisfy the following conditional expression (2). 8 <f / {βr × (1-βd)} <100 (1) -0.8 <flast / fw <-0.5 (2) where f is the entire system Focal length, βr: lateral magnification of all lens groups located closer to the image side than the camera shake correction group, βd: lateral magnification of camera shake correction group, flast: focal length of the last group, fw: focal length of the entire system at the wide-angle end It is. 2. An image processing apparatus, comprising, in order from the object side, a first group having positive power, a second group having negative power, and a third group having positive power. A zoom lens including a final group having power, wherein the third group includes a front group and a rear group in order from the object side, and the front group includes at least one positive lens and at least one negative lens. The front group is decentered in the vertical direction with respect to the optical axis to perform camera shake correction, and the following conditional expression is set at an arbitrary position during zooming.
A zoom lens having a camera shake correction function, which satisfies (1) and the following conditional expression (2): 8 <f / {βr × (1-βd)} <100 (1) -0.8 <flast / fw <-0.5 (2) where, f: focal length of the whole system, βr: lateral magnification of all lens groups located on the image side of the camera shake correction group, βd: lateral of the camera shake correction group Magnification, flast: focal length of the last group, fw: focal length of the entire system at the wide-angle end. 3. The zoom lens having a camera shake correction function according to claim 1, wherein the second lens unit is moved toward the object side when focusing from an object at infinity to a close object.