JP2001242380A - Photographing lens and zoom lens having image blurring correcting function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a photographing lens and a zoom lens having an image blurring correcting function capable of making a distance from a correction optical system to the center of rotation thereof so short that an entire lens frame is constituted to be compact, and obtaining a sufficient correction amount by rotating the correction optical system at a small rotational angle. SOLUTION: The photographing lens has the correction optical system 1 correcting the image blurring by rotating centering around one point 2 near an optical axis in the photographing lens and satisfies following conditional expressions. 0.01<L/fT<1 and 0.1<(L×εT)/(atan(σ/fT)×fT)<0.6 Provided that L means a distance from a surface top nearer to the center of rotation 2 of the optical system 1 to the center of rotation 2, σ means an image blurring amount to be corrected, fT means the focal distance of the photographing lens entire system, εT means an angle to rotate the optical system 1 in order to correct the image blurring amount σ, and atan(σ/fT) means a camera shake angle in the case the image blurring σ caused by camera shake occurs.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographic lens and a zoom lens used in a silver halide camera, a digital camera, a video camera, etc., having a function of correcting image blur due to camera shake or vibration inside the camera. is there.

[0002]

2. Description of the Related Art Conventionally, as a photographing lens having a function of correcting image blur due to camera shake or the like, a correction lens system constituting a part of a photographing lens system as disclosed in JP-A-63-202714 is known. There has been proposed a method of moving an image in a direction to cancel image movement due to camera shake or the like by moving the image in a direction perpendicular to the optical axis. Further, as a further improvement, Japanese Patent Application Laid-Open No. 3-83006,
JP-A-5-232410, JP-A-9-15502
As shown in the publication, the correction lens system forming a part of the photographing lens system is rotated around a point on the optical axis, or the correction lens system is moved in a direction perpendicular to the optical axis and fixed. A method has been proposed in which an image is moved in a direction to cancel the image movement due to camera shake or the like by applying the rotation of (1). In the latter method, in addition to simply moving the correction lens system in a direction perpendicular to the optical axis, by adding an appropriate rotation component, it is possible to reduce the performance deterioration of the entire photographing lens system due to the eccentricity of the correction lens system. Degree of freedom can be increased.

[0003]

As a mechanism for rotating the correction optical system about one point on the optical axis, a lens frame 12 having a correction optical system 11 as shown in FIG. Is easily held by the arm 14 which can be rotated with the fulcrum as a fulcrum. In this case, the longer the arm, the larger the entire lens frame, and the more difficult it is to construct due to interference with a shutter mechanism, an aperture mechanism, a focusing drive mechanism, etc. provided in the lens frame. When a complicated zoom drive mechanism such as a zoom lens is required, interference with such a mechanism becomes a problem. For this reason, it is necessary to shorten the arm by shortening the distance from the correction optical system to the rotation center as much as possible. However, Japanese Unexamined Patent Application Publication No. 3-830
In the conventional examples disclosed in Japanese Patent Application Laid-Open No. 06-206, Japanese Unexamined Patent Application Publication No. Hei 5-232410, the distance from the correction optical system to the center of rotation is relatively large, and the entire lens barrel is compact. Not enough.

On the other hand, in general, most of the ratio of the correction amount of the image position on the image plane to the driving amount of the correction optical system (hereinafter referred to as correction sensitivity) is mostly in the direction perpendicular to the optical axis of the correction optical system. Determined by the moving component. Here, assuming that the distance from the correction optical system to the rotation center is L and the rotation amount of the correction optical system is ε, the moving component Δ in the direction perpendicular to the optical axis is Δ = L × tan
ε. Therefore, when the distance L from the correction optical system to the center of rotation is reduced, the moving component Δ in the direction perpendicular to the optical axis for a fixed rotation angle ε is reduced. However, if the rotation angle ε is increased in order to increase Δ in order to obtain a large correction amount, the performance degradation of the entire lens system due to the tilt component of the correction lens system becomes too large. In the conventional example disclosed in Japanese Patent Application Laid-Open No. 9-15502, the distance from the correction optical system to the center of rotation is relatively small, but the maximum rotation angle of the correction optical system is limited. Therefore, a sufficient correction amount on the image plane cannot be obtained.

Accordingly, the present invention reduces the distance from the correction optical system to the center of rotation thereof to a degree sufficient to make the entire lens barrel compact, and rotates the correction optical system at a small rotation angle. It is an object of the present invention to provide a photographing lens and a zoom lens having an image blur correction function that can obtain a sufficient correction amount even when the image pickup device is used.

[0006]

A photographic lens having an image blur correction function according to the present invention has a correction optical system that corrects image blur by rotating about a point on an optical axis.
It is characterized by satisfying the following conditional expressions (1) and (2). In addition,
The position of the rotation center of the correction optical system may be near the optical axis. 0.01 <L / fT <1 (1) 0.1 <(L × εT) / (tan ⁻¹ (δ / fT) × fT) <0.6 (2) where L: correction The distance from the top of the optical system closest to the rotation center to the most object-side surface or the most image-side surface from the top to the rotation center, δ: the amount of image blur to be corrected, fT: the entire imaging lens system Focal length (when the focal length changes, the value when it becomes the longest), εT: Angle at which the correction optical system is rotated to correct the image blurring amount δ (when the focal length changes, the longest focal length State value), tan ⁻¹ (δ / fT): a camera shake angle when an image shake δ due to camera shake occurs.

Further, the photographic lens having the image blur correcting function according to the present invention is characterized in that, at the maximum rotation angle εmax of the correcting optical system, eccentric aberration generated due to a moving component in a direction perpendicular to the optical axis of the correcting optical system; It is preferable that the eccentric aberration generated due to the tilt component of the correction optical system with respect to the optical axis is almost canceled.

In the zoom lens having an image blur correcting function according to the present invention, a positive first lens unit, a negative second lens unit, and a positive lens which change at least two lens intervals during zooming are arranged in order from the object side. And a correction optical system that corrects image blur due to camera shake by rotating about one point on the optical axis in the third group. The position of the rotation center of the correction optical system may be near the optical axis.

Further, a zoom lens having an image blur correction function according to the present invention is a positive first lens unit, a negative second lens unit, and a positive lens which changes at least two lens intervals at the time of zooming. And a correction optical system that corrects image blur due to camera shake by rotating about one point on the optical axis in the third group. The following conditional expressions (3) and (3) Four)
It is preferable to satisfy the following. The position of the rotation center of the correction optical system may be near the optical axis. 0.01 <L / fT <0.5 (3) 0.1 <(L × εT) / (tan ⁻¹ (δ / fT) × fT) <1.2 (4) : Distance from the top of the correction optical system closest to the rotation center among the most object side surface or the most image side surface to the rotation center, δ: image blur amount to be corrected, fT: total of the photographing lens Focal length of the system (when the focal length changes, the value when it becomes the longest), εT: the angle at which the correction optical system is rotated to correct the image blur amount δ (the longest when the focal length changes, (Value in the focal length state), tan ^-1 (δ / fT): a camera shake angle when an image blur δ due to camera shake occurs.

Conditional expression (3) defines the distance from the correction optical system to the center of rotation required to make the entire lens barrel compact. Since the size of the entire lens frame generally varies depending on the focal length of the entire lens system, in this application, the correction is performed to narrow down the problem of the ratio of the distance from the correction optical system to the center of rotation with respect to the size of the entire lens frame. A value was defined in which the distance from the optical system to the center of rotation was standardized according to the focal length of the entire lens system. L /
If fT is larger than the upper limit of the conditional expression (3), the rotation mechanism of the correction optical system becomes large as described above, and the configuration tends to be difficult due to interference with other mechanisms in the lens barrel. Absent. When L / fT is smaller than the lower limit of the conditional expression (3), the rotation angle for securing a moving component in a direction perpendicular to the optical axis of the correction optical system increases, and as a result, the inclination component of the correction optical system. Undesirably increases the amount of eccentric aberration caused by the above.

Conditional expression (4) defines conditions for obtaining a required image blur correction amount while keeping the rotation angle of the correction optical system small. In general, when image blur δ due to camera shake occurs, assuming that the camera shake angle is α and the focal length of the entire lens system is fT, δ = fT × tan α. In conditional expression (4), ta
n ⁻¹ (δ / fT) represents a camera shake angle when an image shake δ due to camera shake occurs. Therefore, the conditional expression (4) is obtained by multiplying the necessary rotation angle of the correction optical system with respect to the unit amount of the camera shake correction angle by L / fT, and is substantially required in the direction perpendicular to the optical axis of the correction optical system. Is defined. If the necessary vertical movement component exceeds the upper limit of the conditional expression (4) and becomes large, the rotation angle of the correction optical system required to correct image blur as described above increases, and the tilt component of the correction optical system becomes large. Undesirably increases the amount of eccentric aberration caused by the above. Further, in order to reduce the required vertical movement component beyond the lower limit, the lateral magnification of the correction optical system or the optical system on the image plane side beyond the correction optical system must be extremely increased. In addition to being unfavorable due to the lens configuration,
This is not preferable because the correction sensitivity becomes too large and the driving accuracy of the correction optical system becomes extremely severe. Furthermore, in order to reduce the size of the configuration and suppress the amount of rotation, the above conditional expressions (1) and (2)
It is desirable to satisfy the range.

Further, when the image blur is corrected by rotating the correction optical system around the optical axis or a point near the optical axis as in the present invention, the direction perpendicular to the optical axis of the correction optical system as described above is used. There is an aberration generated by the eccentric component and an aberration generated by the tilt component. If these are cancelled, the amount of generated aberration can be reduced as a whole. At this time, as the rotation angle increases, the ratio between the eccentric component and the tilt component in the direction perpendicular to the optical axis changes, but the amount of aberration generated by both components is the largest, and the maximum image blur correction amount At the maximum rotation angle of the correction optical system corresponding to the above, it is best to cancel the aberration generated by the vertical eccentric component and the aberration generated by the tilt component.

In general, it is known that photographing failure due to camera shake is more likely to occur as the focal length of the photographing lens becomes longer. This is because, even if the rotation angle of the camera due to camera shake is constant, the amount of image shake due to the camera shake is proportional to the focal length as described above. In recent years, high-magnification zoom lenses have been used in cameras, and there has been a problem in that photographing fails due to camera shake at the telephoto end of these zoom lenses. A typical lens configuration of such a high-magnification zoom lens includes a first unit having a positive refractive power, a second unit having a negative refractive power, and a third unit having a positive refractive power from the object side. Configurations are known. When image blur is corrected by decentering the correction optical system as in the photographing lens of the present invention in such a configuration, it is necessary to use a correction optical system for a part of the third lens unit having the smallest lens diameter. This is preferable for reducing the size of the drive mechanism of the system. Further, in order to correct fluctuations of astigmatism and the like due to zooming, it is necessary to change the lens interval of a predetermined lens among the lenses constituting the third group having a positive refractive power as a whole from the wide-angle end to the telephoto end. This is effective for maintaining good performance. In the present invention, since the degree of freedom of aberration correction is required in order to reduce the fluctuation of aberration due to the decentering of the correction optical system, the aberration correction is performed by changing the distance between at least two lenses in the third unit at the time of zooming. It is desirable to obtain a degree of freedom.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments using numerical data. First Embodiment FIGS. 1A and 1B are cross-sectional views along the optical axis showing a lens configuration of a first embodiment of a taking lens according to the present invention. FIG. 1A shows a state at a wide-angle end, and FIG. 2A and 2B are diagrams showing spherical aberration, astigmatism, distortion, and coma aberration in the first embodiment. FIG. 2A shows a state at a wide-angle end, and FIG. 2B shows a state at a telephoto end. FIG.
In the first embodiment, when the maximum camera shake angle is set to 0.5 ° and the correction optical system is rotated so as to correct the aberration, aberration caused only by the vertical eccentric component, aberration caused only by the tilt component, (A) is an axial state, (b) is only a vertical eccentric component, only a tilt component, and astigmatism when these are combined, (c) ) and (d) show off-axis states.

In FIG. 1, reference numeral 1 denotes a correction optical system, and reference numeral 2 denotes a rotation center of the correction optical system provided at one point on the optical axis. The position of the rotation center 2 may be near the optical axis. The taking lens according to the present embodiment includes, in order from the object side, a positive first unit G1;
A negative second lens unit G2 and a positive third lens unit which changes the distance between two lenses (indicated by d19 and d21 in the figure) during zooming.
It is configured as a zoom lens having a group G3.
The correction optical system 1 is provided in the third lens group G3, and can correct image blur due to camera shake by rotating about a rotation center 2 via an arm (not shown). Note that the correction optical system 1 according to the present embodiment includes:
It is composed of one lens and is located on the object side of the rotation center 2. Further, as shown in FIG. 3, the photographic lens of the present embodiment is also affected by the eccentric aberration caused by the movement component in the direction perpendicular to the optical axis of the correction optical system and the tilt component with respect to the optical axis of the correction optical system. The eccentric aberration that occurs is almost canceled out.

Next, numerical data of optical members constituting the taking lens according to the present embodiment will be shown. In the numerical data of the present embodiment, r1, r2,... Are the radii of curvature of the respective lens surfaces, d1, d2,.
n1, n2,... are the refractive indices of each lens at d-line, ν1, ν
2,... Are Abbe numbers of the lenses, f is the focal length of the entire photographing lens system, 2ω is the angle of view, and FB is the back focus.
The aspherical shape is represented by Z in the optical axis direction and y in the direction orthogonal to the optical axis, the conic coefficient is k, the aspherical coefficient is AC ₂ , A
_{C 4, AC 6, AC 8} , AC 10, AC 12, AC 14, AC 16,
When AC _{18 and} AC ₂₀ are set, they are expressed by the following equations. Z = (y ² / r) / [1+ ｛1− (1 + k) · (y /
r) ² ｝ ^1/2 ] + AC ₂ y ² + AC ₄ y ⁴ + AC ₆ y ⁶ + AC _{8
^{y 8 + AC 10 y 10 +}} AC 12 y 12 + AC 14 y 14 + AC 16 y
^{_{16 + AC 18 y 18 + AC}} 20 y 20 Note that these symbols are common in numerical data of Examples below.

Numerical data 1 r1 = 76.401 d1 = 1.500 n1 = 1.84666 v1 = 23.78 r2 = 42.764 d2 = 8.930 n2 = 1.60311 v2 = 60.64 r3 = -628.119 d3 = 0.100 r4 = 43.535 d4 = 4.840 n4 = 1.497004 = 249.997 d5 = D1 (variable) r6 = -277.237 (aspherical surface) d6 = 0.850 n6 = 1.77250 v6 = 49.60 r7 = 20.867 d7 = 4.618 r8 = -30.163 (aspherical surface) d8 = 0.860 n8 = 1.80440 v8 = 39.59 r9 = 21.901 d9 = 0.100 r10 = 35.481 d10 = 4.505 n10 = 1.84666 ν10 = 23.78 r11 = -21.554 d11 = 0.788 r12 = -15.431 d12 = 0.750 n12 = 1.74100 ν12 = 52.64 r13 = −70.882 d13 = D2 (variable) Aperture surface) d14 = 0.850 r15 = ∞ (virtual surface on top surface of the surface closest to the object in the correction optical system) d15 = 23.738 r16 = ∞ (virtual surface on rotation center position of correction optical system) d16 = − 23.738 r17 = 22.224 (aspherical surface) d17 = 4.022 n17 = 1.48749 ν17 = 70.23 r18 = −32.024 d18 = 0.000 r19 = ∞ (virtual surface on the top position of the surface closest to the image in the correction optical system) d19 = D3 (variable) r20 = −41.390 d20 = 0.800 n20 = 1.69680 v20 = 55.53 r21 = 213.112 d21 = D4 (variable) r22 = 30.412 d22 = 5.823 n22 = 1.49700 v22 = 81.54 r23 = -35.512 d23 = 0.700 n23 = 1.80518 v23 = 25.42 r24 = -588.899 d24 = 0.100 r25 = 73.690 (aspherical surface) d25 = 3.542 = 1.60311 ν25 = 60.64 r26 = -41.389 (aspherical surface) Image plane ∞

Aspheric coefficient sixth surface k = 0.0000 A ₄ = 1.8639 × 10 ^-5 A ₆ = 1.772 × 10 ^-9 A ₈ = 1.9650 × 10 ^-10 A ₁₀ = 0.0000 × 10 ⁰ A ₁₂ = 0.0000 × 10 ⁰ A ₁₄ = 0.0000 × 10 ⁰ A ₁₆ = 0.0000 × 10 ⁰ A ₁₈ = 0.0000 × 10 ⁰ A ₂₀ = 0.0000 × 10 ⁰ 8th plane k = 0.0000 A ₄ = 1.2473 × 10 ^-5 A ₆ = 2.9681 × 10 ^-10 A ₈ = -3.1348 x 10 ^-10 A ₁₀ = 1.1612 x 10 ^-15 A ₁₂ = 0.0000 x 10 ⁰ A ₁₄ = 0.0000 x 10 ⁰ A ₁₆ = 0.0000 x 10 ⁰ A ₁₈ = 0.0000 x 10 ⁰ A ₂₀ = 0.0000 x 10 ⁰ 17th surface k = 0.0000 A ₄ = -2.1624 x 10 ^-5 A ₆ = 1.8174 x 10 ^-8 A ₈ = -5.7930 x 10 ^-11 A ₁₀ = 4.2903 x 10 ^-15 A ₁₂ = 0.0000 x 10 ⁰ A ₁₄ = 0.0000 x 10 ⁰ A ₁₆ = 0.0000 x 10 ⁰ A ₁₈ = 0.0000 x 10 ⁰ A ₂₀ = 0.0000 x 10 ⁰ 25th plane k = 0.0000 A ₄ = -1.1669 x 10 ^-5 A ₆ = 2.7606 x 10 ^-8 A ₈ = 3.2509 × 10 ^-11 A ₁₀ = 6.2359 × 10 ^-17 A ₁₂ = 0.0000 × 10 ⁰ A ₁₄ = 0.0000 × 10 ⁰ A ₁₆ = 0.0000 × 10 ⁰ A ₁₈ = 0.0000 × 10 ⁰ A ₂₀ = 0.0000 × 10 ⁰ Chapter 26 face k = 0.0000 ^{_{4 = 5.8360 × 10 -6 A 6}} = 2.5525 × 10 -8 A 8 = 3.7124 × 10 -11 A 10 = 0.0000 × 10 0 A 12 = 0.0000 × 10 0 A 14 = 0.0000 × 10 0 A 16 = 0.0000 × 10 ⁰ A ₁₈ = 0.0000 × 10 ⁰ A ₂₀ = 0.0000 × 10 ⁰

Zoom data Wide-angle end Middle telephoto end Focal length f (mm) 14.360 45.500 140.500 F-number 3.851 3.911 4.065 2ω (°) 73.5 24.5 8.0 FB (mm) 34.538 47.656 41.270 D1 1.200 21.096 34.195 D2 23.324 7.876 1.200 D3 3.478 10.530 37.651 D4 20.006 12.770 2.001

L = | d15 | −d17 = | d16 | −d17 = 19.7160 mm δ = 1.2260 mm fT = 140.5000 mm εT = 0.0241 rad tan ⁻¹ (δ / fT) = 0.0087 rad εmax = 0.5 ° Therefore, L / fT = 19.7160 / 140.5000 = 0.403 (L × εT) / (tan ⁻¹ (δ / fT) × fT) = 0.3876, and the photographing lens of this embodiment has the conditional expressions (1), (2),
(3) and (4) are satisfied.

Second Embodiment FIGS. 4A and 4B are sectional views taken along the optical axis showing the lens arrangement of a second embodiment of the taking lens according to the present invention. FIG. 4A shows a state at the wide-angle end, and FIG. Is shown. FIGS. 5A and 5B are diagrams showing spherical aberration, astigmatism, distortion and coma aberration in the second embodiment. FIG. 5A shows the state at the wide-angle end, and FIG. 5B shows the state at the telephoto end. FIG.
In the second embodiment, when the maximum camera shake angle is set to 0.5 ° and the correction optical system is rotated so as to correct the aberration, aberration caused only by the vertical eccentric component, aberration caused only by the tilt component, (A) is an axial state, (b) is only a vertical eccentric component, only a tilt component, and astigmatism when these are combined, (c) ) and (d) show off-axis states. In FIG. 4, 1
Is a correction optical system, and 2 is a rotation center of the correction optical system provided at one point on the optical axis. The position of the rotation center 2 may be near the optical axis. The taking lens of this embodiment has a positive first unit G1 and a negative second unit G2 in order from the object side, and two lens intervals during zooming (indicated by d16 and d18 in the figure).
And a third lens unit G3 for changing the zoom lens. The correction optical system 1 is provided in the third lens group G3, and can correct image blur due to camera shake by rotating about a rotation center 2 via an arm (not shown). Note that the correction optical system 1 of the present embodiment includes three lenses.
It is located on the image side of the rotation center 2. Further, as shown in FIG. 6, the photographic lens of the present embodiment has the eccentric aberration caused by the moving component in the direction perpendicular to the optical axis of the correction optical system and the tilt component with respect to the optical axis of the correction optical system. The eccentric aberration that occurs is almost canceled out.

Next, numerical data of optical members constituting the taking lens according to the present embodiment will be shown. Numerical data 2 r1 = 70.517 d1 = 1.500 n1 = 1.84666 v1 = 23.78 r2 = 41.793 d2 = 8.767 n2 = 1.60311 v2 = 60.64 r3 = 1278.694 d3 = 0.100 r4 = 40.025 d4 = 5.061 n4 = 1.54 800.82 D1 (variable) r6 = 2804.740 (aspherical surface) d6 = 0.850 n6 = 1.77250 v6 = 49.60 r7 = 14.897 d7 = 5.426 r8 = -53.195 (aspherical surface) d8 = 0.860 n8 = 1.80440 v8 = 39.59 r9 = 24.044 d9 = 0.100 r10 = 26.110 d10 = 4.452 n10 = 1.84666 v10 = 23.78 r11 = -41.399 d11 = 1.948 r12 = -16.996 d12 = 0.750 n12 = 1.74100 v12 = 52.64 r13 = -42.877 d13 = D2 (variable) r14 = ∞ (aperture surface) d14 = 0.850 r15 = 25.592 (aspheric surface) d15 = 4.385 n15 = 1.48749 v15 = 70.23 r16 = -26.641 d16 = D3 (variable) r17 = -65.306 d17 = 0.800 n17 = 1.69680 v17 = 55.53 r18 = 47.333 d18 = D4 (variable) = ∞ (top of the surface closest to the object in the correction optical system (Upper virtual surface) d19 = -13.630 r20 = ∞ (virtual surface above the rotation center position of the correction optical system) d20 = 13.630 r21 = 24.035 d21 = 6.707 n21 = 1.49700 v21 = 81.54 r22 = -65.645 d22 = 0.700 n22 = 1.80518 v22 = 25.42 r23 = 80.718 d23 = 0.100 r24 = 83.088 (aspherical surface) d24 = 4.877 n24 = 1.60311 v24 = 60.64 r25 = -29.798 (aspherical surface) d25 = 0.000 r26 = ∞ (the most image-side surface of the correction optical system) Virtual surface on top of the surface) Image surface ∞

Aspheric coefficient sixth surface k = 0.0000 A ₄ = 1.3939 × 10 ^-5 A ₆ = -1.7522 × 10 ^-8 A ₈ = 1.0610 × 10 ^-10 A ₁₀ = 0.0000 × 10 ⁰ A ₁₂ = 0.0000 × 10 ⁰ A ₁₄ = 0.0000 × 10 ⁰ A ₁₆ = 0.0000 × 10 ⁰ A ₁₈ = 0.0000 × 10 ⁰ A ₂₀ = 0.0000 × 10 ⁰ 8th plane k = 0.0000 A ₄ = 1.0538 × 10 ^-5 A ₆ = -3.5789 × 10 ^{_{-8 A 8 = -4.4938 × 10 -10}} A 10 = 0.0000 × 10 0 A 12 = 0.0000 × 10 0 A 14 = 0.0000 × 10 0 A 16 = 0.0000 × 10 0 A 18 = 0.0000 × 10 0 A 20 = 0.0000 × 10 ⁰ 15th surface k = 0.000 A ₄ = -2.8822 × 10 ^-5 A ₆ = 6.2301 × 10 ^-8 A ₈ = -1.4649 × 10 ^-10 A ₁₀ = 0.0000 × 10 ⁰ A ₁₂ = 0.0000 × 10 ⁰ A ₁₄ = 0.0000 × 10 ⁰ A ₁₆ = 0.0000 × 10 ⁰ A ₁₈ = 0.0000 × 10 ⁰ A ₂₀ = 0.0000 × 10 ⁰ 24th surface k = 0.0000 A ₄ = -3.4918 × 10 ^-5 A ₆ = -7.6540 × 10 ^-8 A ₈ = -7.1530 × 10 ^-12 A ₁₀ = 0.0000 × 10 ⁰ A ₁₂ = 0.0000 x 10 ⁰ A ₁₄ = 0.0000 x 10 ⁰ A ₁₆ = 0.0000 x 10 ⁰ A ₁₈ = 0.0000 x 10 ⁰ A ₂₀ = 0.0000 x 10 ⁰ 25th plane k = 0.0000 A ₄ = -1.0353 x 10 ^-5 A ₆ = -6.1491 × 10 ^-8 A ₈ = -4.5405 × 10 ^-12 A ₁₀ = 0.0000 × 10 ⁰ A ₁₂ = 0.0000 × 10 ⁰ A ₁₄ = 0.0000 × 10 ⁰ A ₁₆ = 0.0000 × 10 ⁰ A ₁₈ = 0.0000 × 10 ⁰ A ₂₀ = 0.0000 × 10 ⁰

Zoom data Wide-angle end Middle telephoto end Focal length f (mm) 14.361 45.499 140.495 F-number 3.851 3.911 4.065 2ω (°) 73.8 24.8 8.0 FB (mm) 35.149 48.582 41.335 D1 1.199 21.041 34.127 D2 26.069 8.533 1.199 D3 7.301 13.650 35.563 D4 18.271 11.487 1.999

L = | d19 | = | d20 | = 13.6300 mm δ = 1.2260 mm fT = 140.4950 mm εT = 0.0435 rad tan ⁻¹ (δ / fT) = 0.0087 rad εmax = 0.5 ° Therefore, L / fT = 0.0970 ( L × εT) / (tan ⁻¹ (δ / fT) × fT) = 0.4836, and the photographing lens of this embodiment has the conditional expressions (1), (2),
(3) and (4) are satisfied.

Third Embodiment FIGS. 7A and 7B are sectional views taken along the optical axis showing the lens arrangement of a third embodiment of the taking lens according to the present invention. FIG. 7A shows a state at the wide-angle end, and FIG. Is shown. FIGS. 8A and 8B are diagrams showing spherical aberration, astigmatism, distortion and coma aberration in the third embodiment. FIG. 8A shows the state at the wide-angle end, and FIG. 8B shows the state at the telephoto end. FIG.
In the third embodiment, when the maximum camera shake angle is set to 0.5 ° and the correction optical system is rotated so as to correct the aberration, aberration caused only by the vertical eccentric component, aberration caused only by the tilt component, (A) is an axial state, (b) is only a vertical eccentric component, only a tilt component, and astigmatism when these are combined, (c) ) and (d) show off-axis states. In FIG. 7, 1
Is a correction optical system, and 2 is a rotation center of the correction optical system provided at one point on the optical axis. The position of the rotation center 2 may be near the optical axis. The taking lens of this embodiment has a positive first unit G1, a negative second unit G2, and two lens intervals at the time of zooming (indicated by d25 and d27 in the drawing).
And a third lens unit G3 for changing the zoom lens. The correction optical system 1 is provided in the third lens group G3, and can correct image blur due to camera shake by rotating about a rotation center 2 via an arm (not shown). Note that the correction optical system 1 of the present embodiment includes three lenses.
It is located on the object side of the rotation center 2. Further, as shown in FIG. 9, the photographic lens of the present embodiment is also affected by eccentric aberration caused by a moving component in a direction perpendicular to the optical axis of the correction optical system and tilt component with respect to the optical axis of the correction optical system. The eccentric aberration that occurs is almost canceled out.

Next, numerical data of optical members constituting the taking lens according to the present embodiment will be shown. Numerical data 3 r1 = 63.094 d1 = 1.200 n1 = 1.84666 ν1 = 23.78 r2 = 37.738 d2 = 6.819 n2 = 1.72600 ν2 = 53.57 r3 = 358.517 d3 = 0.200 r4 = 43.172 d4 = 3.665 n4 = 1.54 540 = 81.54 D1 (variable) r6 = 79.991 d6 = 1.000 n6 = 1.77250 v6 = 49.60 r7 = 13.383 (aspherical surface) d7 = 4.221 r8 = -95.063 d8 = 1.000 n8 = 1.77250 v8 = 49.60 r9 = 17.835 d9 = 0.300 r10 = 16.834 4.529 n10 = 1.84666 v10 = 23.78 r11 = -36.411 d11 = 0.474 r12 = −29.902 d12 = 1.000 n12 = 1.77250 v12 = 49.60 r13 = 22.547 d13 = D2 (variable) r14 = ∞ (aperture surface) d14 = 1.200 r15 = ∞ ( D15 = 21.786 r16 = ∞ (virtual surface at the center of rotation of the correction optical system) d16 = -21.786 r17 = 28.254 d17 = 4.846 n17 = 1.51821 ν17 = 65.04 r18 = -12.239 d18 = 0.998 n18 = 1.84666 ν1 8 = 23.78 r19 = -26.124 (aspherical surface) d19 = 0.100 r20 = 24.948 d20 = 3.250 n20 = 1.49700 v20 = 81.54 r21 = -70.686 d21 = 0.000 r22 = ∞ (Top position of the surface closest to the image in the correction optical system) (Upper virtual surface) d22 = D3 (variable) r23 = 56.420 d23 = 2.585 n23 = 1.84666 v23 = 23.78 r24 = −20.336 d24 = 0.648 n24 = 1.88300 v24 = 40.76 r25 = 104.477 d25 = 1.996 r26 = −29.561 (non-spherical surface) d26 = 0.997 n26 = 1.88300 v26 = 40.76 r27 = 32.676 d27 = D4 (variable) r28 = 139.275 (aspherical surface) d28 = 4.025 n28 = 1.61800 v28 = 63.33 r29 = -29.758 d29 = 0.100 r30 = 28.296 d30 = 6.860 n30 ν30 = 65.94 r31 = -19.482 d31 = 0.300 r32 = -19.586 d32 = 1.099 n32 = 1.84666 ν32 = 23.78 r33 = -33.615 Image plane ∞

Aspheric coefficient seventh surface k = 0.0000 A ₄ = 4.6427 × 10 ⁻⁶ A ₆ = 0.0000 × 10 ⁰ A ₈ = 0.0000 × 100 A ₁₀ = 0.0000 × 100 A ₁₂ = 0.0000 × 100 A ₁₄ = 0.0000 × 10 ⁰ A ₁₆ = 0.0000 × 10 ⁰ A ₁₈ = 0.0000 × 10 ⁰ A ₂₀ = 0.0000 × 10 ⁰ Surface 19 k = 0.0000 A ₄ = -1.3155 × 10 ^-5 A ₆ = 0.0000 × 10 ⁰ A ₈ = 0.0000 × 10 ⁰ A ₁₀ = 0.0000 × 10 ⁰ A ₁₂ = 0.0000 × 10 ⁰ A ₁₄ = 0.0000 × 10 ⁰ A ₁₆ = 0.0000 × 10 ⁰ A ₁₈ = 0.0000 × 10 ⁰ A ₂₀ = 0.0000 × 10 ⁰ Surface 26 k = 0.0000 A ₄ = 1.4250 × 10 ^-5 A ₆ = 0.0000 × 10 ⁰ A ₈ = 0.0000 × 10 ⁰ A ₁₀ = 0.0000 × 10 ⁰ A ₁₂ = 0.0000 × 10 ⁰ A ₁₄ = 0.0000 × 10 ⁰ A ₁₆ = 0.0000 × 10 ⁰ A ₁₈ = 0.0000 × 10 ⁰ A ₂₀ = 0.0000 × 10 ⁰ Surface 28 k = 0.0000 A ₄ = -2.2019 × 10 ^-5 A ₆ = 0.0000 × 10 ⁰ A ₈ = 0.0000 × 10 ⁰ A ₁₀ = 0.0000 × 10 ⁰ A ₁₂ = 0.0000 × 10 ⁰ A ₁₄ = 0.0000 × 10 ⁰ A ₁₆ = 0.0000 × 10 ⁰ A ₁₈ = 0.0000 × 10 ⁰ A ₂₀ = 0.0000 x 10 ⁰

Zoom data Wide-angle end Middle telephoto end Focal length f (mm) 14.403 43.998 141.992 F-number 3.485 4.139 4.421 2ω (°) 76.2 27.1 8.5 FB (mm) 31.298 46.471 45.956 D1 1.200 19.997 36.063 D2 16.826 6.332 1.500 D3 1.000 5.347 12.083 D4 8.039 5.288 1.000

L = | d15 | − (d17 + d18 + d19 + d20) = | d16 | − (d17 + d18 + d19 + d20) = 12.5980 mm δ = 1.2390 mm fT = 141.9920 mm εT = 0.0218 rad tan ⁻¹ (δ / fT) = 0.0087 rad εmax = 0.5 ° Therefore, L / fT = 0.0887 (L × εT) / (tan ⁻¹ (δ / fT) × fT) = 0.21616, and the photographing lens of this embodiment has the conditional expressions (1), (2), and (2).
(3) and (4) are satisfied.

Fourth Embodiment FIGS. 10A and 10B are sectional views taken along the optical axis showing the lens configuration of a fourth embodiment of the taking lens according to the present invention. FIG.
Indicates the state at the telephoto end. FIGS. 11A and 11B are diagrams showing spherical aberration, astigmatism, distortion, and coma aberration in the fourth embodiment. FIG. 11A shows the state at the wide-angle end, and FIG. 11B shows the state at the telephoto end. FIG.
2 is the aberration caused by only the eccentric component in the vertical direction and the aberration caused only by the tilt component when the correction optical system is rotated so as to correct the maximum camera shake angle in the fourth embodiment to 0.5 degree. FIGS. 8A and 8B are aberration diagrams when these are combined, (a) is an axial state, (b) is only a vertical eccentric component, only a tilt component, and astigmatism when these are combined, c) and (d) show off-axis states. In FIG.
Reference numeral 1 denotes a correction optical system, and reference numeral 2 denotes a rotation center of the correction optical system provided at one point on the optical axis. The position of the rotation center 2 may be near the optical axis. The taking lens according to the present embodiment includes, in order from the object side, a positive first unit G1, a negative second unit G2,
The zoom lens has a positive third lens group G3 that changes the lens interval (indicated by d20 and d29 in the figure) at each point. The correction optical system 1 includes a third group G3
The image blur caused by camera shake can be corrected by rotating about the rotation center 2 via an arm (not shown). Note that the correction optical system 1 of the present embodiment includes three lenses, and is located closer to the object side than the rotation center 2. Further, as shown in FIG. 12, the photographic lens of the present embodiment is also affected by eccentric aberration caused by a moving component in a direction perpendicular to the optical axis of the correction optical system and tilt component of the correction optical system with respect to the optical axis. The eccentric aberration that occurs is almost canceled out.

Next, numerical data of optical members constituting the taking lens according to the present embodiment will be shown. Numerical data 4 r1 = 155.552 d1 = 2.500 n1 = 1.80518 v1 = 25.42 r2 = 97.306 d2 = 10.600 n2 = 1.49700 v2 = 81.54 r3 = -497.482 d3 = 0.200 r4 = 97.449 d4 = 5.979 n4 = 1.620.70 v4 = D1 (variable) r6 = 372.128 d6 = 2.000 n6 = 1.80400 v6 = 46.57 r7 = 25.644 (aspherical surface) d7 = 8.360 r8 = -65.960 d8 = 2.000 n8 = 1.77250 v8 = 49.60 r9 = 91.174 d9 = 0.200 r10 = 50.50 = 7.354 n10 = 1.80518 v10 = 25.42 r11 = -62.894 d11 = 1.457 r12 = -44.206 d12 = 2.000 n12 = 1.77250 v12 = 49.60 r13 = 2362.703 d13 = D2 (variable) r14 = ∞ (aperture surface) d14 = 3.000 r15 = 62.115 (Aspherical surface) d15 = 5.897 n15 = 1.67270 v15 = 32.10 r16 = −95.302 d16 = 0.200 r17 = 597.595 d17 = 4.641 n17 = 1.50378 v17 = 66.81 r18 = -97.651 d18 = 2.396 r19 = −45.894 d19 = 2.000 n191.805 = 25.42 r20 = -1621.373 d20 = D3 (variable R21 = ∞ (virtual surface on the top of the surface closest to the object in the correction optical system) d21 = 33.298 r22 = ∞ (virtual surface on the rotation center position of the correction optical system) d22 = −33.298 r23 = 28.074 d23 = 8.207 n23 = 1.51633 v23 = 64.14 r24 = 93.176 d24 = 4.178 r25 = -63.528 d25 = 2.000 n25 = 1.80518 v25 = 25.42 r26 = 538.912 d26 = 1.427 r27 = 146.193 (aspherical surface) d27 = 7.581 r27 = 1.4874927 = -32.015 d28 = 0.000 r29 = ∞ (virtual surface on the top of the surface closest to the image in the correction optical system) d29 = D4 (variable) r30 = -79.402 d30 = 8.214 n30 = 1.64769 v30 = 33.79 r31 =- 26.248 d31 = 0.732 r32 = -24.387 d32 = 1.994 n32 = 1.80400 ν32 = 46.57 r33 = -62.687 Image plane ∞

Aspheric coefficient seventh surface k = 0.000 A ₄ = −1.0100 × 10 ⁻⁶ A ₆ = -1.8605 × 10 ^-9 A ₈ = 0.0000 × 10 ⁰ A ₁₀ = 0.0000 × 10 ⁰ A ₁₂ = 0.0000 × 10 ⁰ A ₁₄ = 0.0000 × 10 ⁰ A ₁₆ = 0.0000 × 10 ⁰ A ₁₈ = 0.0000 × 10 ⁰ A ₂₀ = 0.0000 × 10 ⁰ 15 surfaces k = 0.0000 A ₄ = 1.0866 × 10 ^-6 A ₆ = 1.0565 × 10 ^-9 A ₈ = 0.0000 × 10 ⁰ A ₁₀ = 0.0000 × 10 ⁰ A ₁₂ = 0.0000 × 10 ⁰ A ₁₄ = 0.0000 × 10 ⁰ A ₁₆ = 0.0000 × 10 ⁰ A ₁₈ = 0.0000 × 10 ⁰ A ₂₀ = 0.0000 × 10 ⁰ Surface 27 k = 0.0000 A ₄ = -1.2951 × 10 ^-5 A ₆ = -3.0793 x 10 ^-10 A ₈ = 0.0000 x 10 ⁰ A ₁₀ = 0.0000 x 10 ⁰ A ₁₂ = 0.0000 x 10 ⁰ A ₁₄ = 0.0000 x 10 ⁰ A ₁₆ = 0.0000 x 10 ⁰ A ₁₈ = 0.0000 x 10 ⁰ A ₂₀ = 0.0000 × 10 ⁰

Zoom data Wide-angle end Middle telephoto end Focal length f (mm) 29.183 91.999 289.990 F-number 3.500 4.700 5.600 2ω (°) 77.3 25.9 8.3 FB (mm) 53.376 112.093 109.430 D1 3.000 34.512 84.874 D2 49.817 19.029 3.000 D3 23.049 5.823 3.000 D4 11.874 7.895 6.690

L = | d21 |-(d23 + d24 + d25 + d26 + d27) = | d22 |-(d23 + d24 + d25 + d26 + d27) = 9.9050 mm δ = 2.5310 mm fT = 289.9900 mm εT = 0.0496 rad tan ⁻¹ (δ / fT) = 0.0087 rad εmax = 0.5 Therefore, L / fT = 0.0342 (L × εT) / (tan ⁻¹ (δ / fT) × fT) = 0.1941, and the photographing lens of the present embodiment has the conditional expressions (1), (2), and (2).
(3) and (4) are satisfied.

As described above, the photographic lens according to the present invention has the following features in addition to the features described in the claims. (1) A positive first lens unit, a negative second lens unit, and a positive third lens unit that changes at least two lens intervals at the time of zooming in order from the object side. A zoom lens having a correction optical system for correcting image blur due to camera shake by rotating about a point on or near the optical axis, and satisfying the following conditional expressions (3) and (4): . 0.01 <L / fT <0.5 (3) 0.1 <(L × εT) / (tan ⁻¹ (δ / fT) × fT) <1.2 (4) : Distance from the top of the correction optical system closest to the rotation center to the object side surface or the image side surface closest to the rotation center to the rotation center, δ: image blur amount to be corrected, fT: whole lens system (The value when the focal length changes, the value at which it becomes the longest), εT: the angle at which the correction optical system is rotated to correct the image blurring amount δ (when the focal length changes, the longest focus (Value in the distance state), tan ^-1 (δ / fT): a camera shake angle when image blur δ due to camera shake occurs.

[0037]

According to the present invention, it is possible to provide a small photographing lens and a small zoom lens which are not deteriorated in performance even when correcting image blur due to camera shake or the like.

[Brief description of the drawings]

FIGS. 1A and 1B are cross-sectional views along the optical axis showing a lens configuration of a first embodiment of a taking lens according to the present invention, where FIG.
Indicates the state at the telephoto end.

FIGS. 2A and 2B are diagrams showing spherical aberration, astigmatism, distortion, and coma aberration in the first example, where FIG. 2A shows a state at a wide-angle end and FIG. 2B shows a state at a telephoto end.

FIG. 3 is a diagram showing only the aberration and the tilt component due to only the eccentric component in the vertical direction when the correction optical system is rotated so as to correct the maximum camera shake angle in the first embodiment. It is an aberration diagram when aberrations and these are combined, (a) is an axial state, (b) is only a vertical eccentric component, only a tilt component, and astigmatism when these are combined, (c) and (d) show the state outside the axis.

FIGS. 4A and 4B are cross-sectional views along the optical axis showing a lens configuration of a second embodiment of the taking lens according to the present invention, wherein FIG.
Indicates the state at the telephoto end.

5A and 5B are diagrams illustrating spherical aberration, astigmatism, distortion, and coma aberration in the second example, where FIG. 5A illustrates a state at a wide-angle end, and FIG. 5B illustrates a state at a telephoto end.

FIG. 6 is a diagram showing only the aberration and the tilt component due to only the eccentric component in the vertical direction when the correction optical system is rotated so as to correct the maximum camera shake angle in the second embodiment. It is an aberration diagram when aberrations and these are combined, (a) is an axial state, (b) is only a vertical eccentric component, only a tilt component, and astigmatism when these are combined, (c) and (d) show the state outside the axis.

FIGS. 7A and 7B are cross-sectional views along the optical axis showing a lens configuration of a third embodiment of the taking lens according to the present invention, wherein FIG.
Indicates the state at the telephoto end.

FIGS. 8A and 8B are diagrams showing spherical aberration, astigmatism, distortion, and coma aberration in the third embodiment, where FIG. 8A shows a state at a wide-angle end and FIG. 8B shows a state at a telephoto end.

FIG. 9 is a diagram illustrating the aberration and tilt component only due to the vertical eccentric component when the correction optical system is rotated so as to correct the maximum camera shake angle in the third embodiment. It is an aberration diagram when aberrations and these are combined, (a) is an axial state, (b) is only a vertical eccentric component, only a tilt component, and astigmatism when these are combined, (c) and (d) show the state outside the axis.

FIG. 10 is a sectional view taken along the optical axis showing a lens configuration of a fourth embodiment of the taking lens according to the present invention, wherein (a) is a wide-angle end,
(b) shows the state at the telephoto end.

FIGS. 11A and 11B are diagrams showing spherical aberration, astigmatism, distortion, and coma aberration in the fourth example, where FIG.
Indicates the state at the telephoto end.

FIG. 12 is a graph showing a maximum camera shake angle of 0.5
Degree is set, the aberration due to only the eccentric component in the vertical direction when the correction optical system is rotated to correct this, the aberration due to only the tilt component, and the aberration diagram when these are combined, (a) Indicates an on-axis state, (b) indicates only a vertical eccentric component, only a tilt component, and astigmatism when these are combined, and (c) and (d) indicate off-axis states.

FIG. 13 is a general conceptual diagram of a mechanism for rotating a correction optical system around one point on the optical axis.

[Explanation of symbols]

 1,11 Correction Optical System 2,13 Rotation Center of Correction Optical System 12 Lens Frame of Correction Optical System 14 Arm G1 Positive First Group G2 Negative Second Group G3 Positive Third Group

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H087 KA02 KA03 MA09 MA12 MA13 MA14 MA19 NA07 PA05 PA20 PB13 QA02 QA07 QA12 QA21 QA25 QA34 QA42 QA45 SA02 SA13 SA17 SA19 SA62 SA63 SA64 SB04 SB16 SB26 9A001 KK16 KK42

Claims (3)

[Claims] A correction optical system that corrects image blur by rotating about a point on or near the optical axis;
An imaging lens characterized by satisfying the following conditional expressions (1) and (2). 0.01 <L / fT <1 (1) 0.1 <(L × εT) / (tan ⁻¹ (δ / fT) × fT) <0.6 (2) where L: correction The distance from the top of the optical system closest to the rotation center to the most object-side surface or the most image-side surface from the top to the rotation center, δ: the amount of image blur to be corrected, fT: the entire imaging lens system Focal length (when the focal length changes, the value when it becomes the longest), εT: Angle at which the correction optical system is rotated to correct the image blurring amount δ (when the focal length changes, the longest focal length State value), tan ⁻¹ (δ / fT): a camera shake angle when an image shake δ due to camera shake occurs. 2. At the maximum rotation angle εmax of the correction optical system, an eccentric aberration caused by a moving component in a direction perpendicular to the optical axis of the correction optical system and an inclination component of the correction optical system with respect to the optical axis occur. 2. The photographing lens according to claim 1, wherein the eccentric aberration is substantially canceled. 3. A positive first lens unit and a negative second lens unit in order from the object side.
A third group having a lens group and a positive third group that changes the lens spacing at least at two or more positions during zooming, wherein the third group is rotated around a point on or near the optical axis by camera shake. A zoom lens having a correction optical system for correcting image blur.