JPH1090599A - Zoom lens with anti-vibration function - Google Patents

Abstract

(57) [Problem] To provide a high-performance photographic or video zoom lens that is applicable to a single-lens reflex camera, and is particularly applicable to an inner focus long focus zoom lens. Has from an object side and a second lens group G ₂ having a first lens group G ₁ and the negative refractive power in this order, in the zoom lens having a final lens group G _L closest to the image side, a first lens The group G ₁ includes a focusing lens group G _1N having a negative refractive power, and the last lens group G _L includes a vibration-proof lens group G _V , and moves the focusing lens group G _1N in the optical axis direction during focusing. and, during zooming, and moving at least the second lens group G ₂ in the optical axis direction, during image stabilization, characterized by moving the vibration reduction lens group G _V in a direction substantially perpendicular to the optical axis.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-shake technique for a photographic lens, a video zoom lens, and the like, and more particularly to a long focal length zoom lens having an anti-shake function.

[0002]

2. Description of the Related Art As a zoom lens having an image stabilizing function, for example, there is a zoom lens disclosed in Japanese Patent Application Laid-Open No. 1-119113. In a zoom lens composed of two or more lens groups, vibration is reduced by a lens group that moves during zooming or by a part of the lens groups.

[0003]

However, the above prior art is not suitable for a long focal length zoom lens because the focal length on the telephoto side is short. In addition, there is a disadvantage that a sufficient back focus cannot be obtained for a single-lens reflex camera or an electronic image device. Accordingly, it is an object of the present invention to provide a high-performance photographic or electronic imaging apparatus zoom lens that can be applied to a single-lens reflex camera and can be applied to an inner focus long focal length zoom lens. .

[0004]

In order to solve such a problem, according to the present invention, the first lens group G is sequentially arranged from the object side.
_In a zoom lens having ₁ and a second lens group G ₂ having a negative refractive power, and a final lens group _GL closest to the image side, the first lens group G ₁ is a focusing lens having a negative refractive power. includes a group G _1N, the final lens group G _L includes a vibration reduction lens group G _V, to move the focusing lens group G _1N in the optical axis direction for focusing light at least a second lens group G ₂ during zooming moves in the axial direction, characterized in that moving the vibration reduction lens group G _V in a direction substantially perpendicular to the optical axis upon vibration reduction, and a zoom lens with a vibration reduction function.

According to the present invention, a first lens group G ₁ having a positive refractive power and a second lens group G ₁ having a negative refractive power are basically arranged in order from the object side so as to be suitable for a photographic or video zoom lens. 2
A lens group G _2, and a final lens group _GL having a positive refractive power on the most image side, and at the time of zooming from the wide-angle end to the telephoto end, at least the second lens group G ₂ is placed on the image side. The method of moving to is adopted. Furthermore, focusing to a finite distance, it performs a part of the negative lens group G _1N in the first lens group G ₁ is moved along the optical axis. Further, the second lens group G
_{A third} lens having a positive refractive power between the _second lens unit and the last lens unit _GL ;
If a structure of disposing a lens group G _3, high magnification is more preferable because high performance can be achieved. Here, the method of the image stabilizing function of the zoom lens according to the present invention will be described. By moving the lens group or a part of the lens group in a direction substantially orthogonal to the optical axis by the image stabilizing displacement means, the camera shake and A method of correcting a change in an imaging state caused by vibration is adopted.

First, the features and advantages of this type of zoom lens will be briefly described. That is, a long focal length zoom lens can be achieved and good imaging performance can be obtained at each focal length. Can be For example, in the case of a photographic zoom lens, a zoom lens having a short focal length of about 150 mm and a long focal length of about 500 mm is known. Due to such excellent properties, it is widely used as a long focal length zoom lens for photography and video. Thus, most if you focus on the object side first lens group G within _1, since the feeding amount of the focusing lens group G _1N is constant regardless of the zoom position on the subject of constant shooting distance, if The mechanism for charring can be simplified, which is convenient. In addition, aberration fluctuation during focusing is generally small, which is preferable.

[0007] In general, the zoom lens convex group precedes is a first lens group G ₁ and most large lens group, Therefore, in order to first lens group G ₁ and a portion of the vibration isolation It is not preferable to use a correction optical system that moves in a direction perpendicular to the optical axis because the holding mechanism and the driving mechanism become large.
Further, like the zoom type of the present invention, the first lens group G
If the focus in the _1, since the mechanism for focusing is incorporated in G ₁ near the first lens group, the structure tends to be complicated, and the complicated holding mechanism and the drive mechanism for vibration reduction preferably Absent. Therefore, as a zoom lens of the present invention, it is not preferable to the first lens group G ₁ to the vibration correcting optical system. Also, like the second lens group G ₂ and the third lens group G ₃ of the present invention, the lens groups that move in the optical axis direction during zooming are not preferable because the mechanism becomes complicated. Therefore, in the present invention, for this reason and because good aberration characteristics at the time of image stabilization, provided a vibration reduction lens group G _V in the final lens group G _L. At this time, since it antivibration without the difference in the change of the image quality around and nearby the screen center, the aperture stop, it is desirable to place near the vibration reduction lens group G _V.

In the present invention, when zooming from the wide-angle end to the telephoto end, the distance between the first lens group G ₁ and the second lens group G ₂ increases, and the second lens group G ₂ and its image side It is preferable that the distance from the lens group located is changed. It is desirable that the image stabilizing lens group G _V and the aperture stop be fixed during zooming in order to simplify the mechanism. Further, if a fixed stop fixed on the optical axis is provided separately from the aperture stop, the vibration-proof lens group G
It is more effective in blocking unwanted flare rays when _V is displaced.

Further, in the present invention, ΔS: the maximum displacement f _L in the direction substantially orthogonal to the optical axis of the image stabilizing lens group G _{V that} moves during image stabilization f _L : focal length of the last lens group _GL f _V : image stabilization the focal length f _1N of vibration lens group G _V: focal length of the focusing lens group G _1N f _1: when a focal length of the first lens group _{G 1, ΔS / | f L} | <0.1 (1) 0 _{.2 <| f V | / f} L <10 (2) 0.05 <| f 1N | / f 1 < preferable to satisfy 10 (3) comprising the conditional expressions.

Formula (1) defines an appropriate range for the maximum displacement ΔS in the direction perpendicular to the optical axis of the vibration-proof lens group G _V by the ratio to the focal length f _L of the final lens group _GL. It is. When the value exceeds the upper limit of the conditional expression (1), the maximum displacement ΔS of the image stabilizing lens group G _V becomes too large. As a result, the amount of fluctuation in aberration during image stabilization becomes large, which is inconvenient. In particular, the difference between the best image plane in the meridional direction and the best image plane in the sagittal direction at the peripheral position on the image plane is widened, which is inconvenient. In addition, the mechanism is undesirably complicated. Needless to say, if no movement is made, the effect of vibration reduction cannot be obtained, so that ΔS is larger than 0 (ΔS>
0). If the upper limit of conditional expression (1) is set to 0.05, more favorable effects can be obtained.

[0011] Condition (2), the focal length f _V of the vibration reduction lens group G _V, the ratio between the focal length f _L of the final lens group G _L,
It defines the appropriate range. If the upper limit of the conditional expression (2) is exceeded, the focal length f _V of the anti-vibration lens group G _V becomes too large, so that the amount of movement during anti-vibration becomes too large, and as a result, it is orthogonal to the optical axis. when moving in the direction, in order to light beam is not eclipsed, it is necessary to increase the lens diameter of the vibration reduction lens group G _V excessively, undesirably.
Further, the overall length of the zoom lens becomes long, which is inconvenient. On the other hand, if the lower limit of conditional expression (2) is exceeded, the magnitude of the focal length f _V of the image stabilizing lens group G _V becomes too small, and the spherical aberration tends to become too large on the negative side, which is inconvenient.
In addition, the amount of movement of the image during image stabilization becomes too large. As a result, when moving in a direction orthogonal to the optical axis for image stabilization, it becomes difficult to control for fine positioning in that direction. Is inconvenient. Note that the lower limit of conditional expression (2) is set to 0.8.
If the upper limit is set to 4.0, a more preferable effect can be obtained.

[0012] Incidentally, even positive focal length f _V of the vibration reduction lens group G _V, may be a negative, but who is positive to configure a bright optical system is preferable. In this case, the conditional expression (2) becomes _{0.2 <f V / f L <} 10 (2P). The anti-vibration lens group G _V preferably has a convex lens closest to the object, and preferably has at least one concave lens. Also, if the focal length f _V of the vibration reduction lens group G _V is negative, easily a vibration reduction lens group G _V small, it is liable advantage to shorten the total length. The group antivibration lens G _V has a concave lens on the most image side, preferably has at least one convex lens. Similarly, in conditional expression (2P), if the lower limit is set to 0.8 and the upper limit is set to 4.0, more preferable effects can be obtained.

Conditional expression (3) shows that the focal length f _1N of the focusing lens group G _1N having a negative refractive power in the first lens group G ₁ is:
It is as defined appropriate proportion of the refractive power of the focal length f ₁ of the first lens group G _1. This equation is important for achieving good imaging performance during focusing. If the upper limit of conditional expression (3) is exceeded, spherical aberration tends to be excessively large on the negative side, and the overall length becomes long, which is not suitable for compactness. In addition, not only does the Petzval sum tend to be excessive on the positive side, but also the astigmatic difference and the curvature of the image plane increase, so that good imaging performance cannot be obtained. Conversely, if the lower limit of conditional expression (3) is exceeded, it will be difficult to secure a sufficient length of back focus.
It is inconvenient. In addition, spherical aberration tends to be excessively large on the negative side, and outward coma aberration is more likely to occur in light rays above the principal ray, which is inconvenient. Note that conditional expression (3)
If the lower limit is set to 0.1 and the upper limit is set to 1.0, more preferable effects can be obtained.

Further, in order to obtain good performance, (1)
It is desirable to satisfy the following conditional expressions (4) and (5) in addition to the expressions (3) to (3). 0.3 <| r _VL / f _V | <30.0 (4) 0.02 <L / f _L <0.35 (5) where r _{VL is} the most image-side surface of the anti-vibration lens group G _V Is the thickness of the anti-vibration lens group G _{V on} the optical axis. If the upper limit or the lower limit of the equation (4) is exceeded, the fluctuation of the spherical aberration and the fluctuation of the curvature of field and the astigmatism at the time of image stabilization become excessive, which is inconvenient. If the lower limit of conditional expression (4) is 0.4 and the upper limit is 20.0,
A more favorable effect can be obtained. Conditional expression (5) shows an appropriate range of the thickness L on the optical axis of the image stabilizing lens group G _V with respect to the focal length f _L of the final lens group _GL . If the upper limit of conditional expression (5) is exceeded, the anti-vibration lens group G _V
Thickness L on the optical axis becomes too large, and the anti-vibration lens group G _V
However, the overall size of the zoom lens becomes too long, which is not only inconvenient, but also complicates the vibration-proof mechanism, which is inconvenient. The lower limit of conditional expression (5) is set to 0.03,
If the upper limit is set to 0.15, more favorable effects can be obtained.

When actually forming the anti-vibration lens group G _V ,
It is desirable that the following conditional expressions (6) and (7) be satisfied in addition to the above-described conditions. 0.06 <Δn (6) 5.0 <Δν (7) where Δn: Difference in refractive index between the most object-side convex lens and the most object-side concave lens in the image stabilizing lens group G _V Δν: Image stabilization the most object side lens in the lens group G _V,
This is the difference in Abbe number with the concave lens closest to the object. If the lower limit of conditional expression (6) is exceeded, it becomes difficult to correct spherical aberration at the telephoto end. As a result, good imaging performance cannot be obtained, which is inconvenient. At this time, the refractive index of the concave lens closest to the object is higher than the refractive index of the convex lens closest to the object. If the lower limit of conditional expression (7) is exceeded, axial chromatic aberration will be excessively generated, and as a result, good imaging performance cannot be obtained, which is inconvenient.

Further, in the structure of the zoom lens, since the second lens group G ₂ and the third lens group G ₃ constitute a variable power system, the following conditions are also important. _{0.1 <| f 2 | / f} 1 <0.45 (8) 0.8 <f L / f 3 <1.7 (9) where, f _2: the focal length f ₃ of the second lens group G ₂ is a focal length of the third lens group G _3. If the upper limit of conditional expression (8) is exceeded, not only the spherical aberration at the telephoto end becomes too large in the negative direction, but also the fluctuation of coma becomes excessive, which is inconvenient. If the lower limit of conditional expression (8) is exceeded, the astigmatism difference at the wide-angle end becomes large, the distortion greatly moves in the negative direction at the wide-angle end and the telephoto end, and the Petzval sum tends to shift to the negative side. It is. If the upper limit of conditional expression (9) is exceeded, not only the spherical aberration becomes extremely large in the negative direction, but also the fluctuation of the coma becomes excessive, which is inconvenient. In addition, the Petzval sum tends to shift to the positive side, which is inconvenient. If the lower limit of conditional expression (9) is exceeded, not only is the overall length of the zoom lens too long, which is disadvantageous, but also distortion tends to be excessively large in the positive direction at the telephoto end. The diameter of the lens group on the object side than the third lens group G ₃ becomes large, which is undesirable.

The first lens group G ₁ preferably has a convex lens group G ₁₁ on the object side of the negative lens group G _1N for focusing. It is desirable to satisfy the following conditional expression. 0.15 <L _1N / f ₁ <0.8 (10) where L _1N is an air gap between the convex lens group G ₁₁ and the focusing lens group G _1N at infinity shooting. Above the upper limit of condition (10), the first total length of the lens group G ₁ becomes too large, which is undesirable. In addition, the Petzval sum tends to shift to the positive side, which is inconvenient. If the lower limit of conditional expression (10) is exceeded, not only the lens diameter of the focusing lens group G _1N becomes too large, which is inconvenient, but also the diameter of the lens group on the image side larger than that of the focusing lens group G _1N. It is. Further, it is desirable that the first lens group G ₁ has a convex lens group G ₁₂ on the image side of the focusing lens group G _1N . With such a configuration, the first lens group G _1, to increase the degree of freedom of refractive power distribution with respect to the focusing lens group G _1N, is preferred for achieving a good focusing performance.

In the present invention, it is desirable to satisfy the following conditional expressions. 0.2 <f ₁ / (f _W · Z) <0.8 (11) where f _W is the focal length of the entire zoom lens at the wide-angle end, and Z is the zoom ratio of the entire zoom lens. Above the upper limit of condition (11), the focal length magnitude of f ₁ of the first lens group G ₁ becomes too large,
This is inconvenient because the entire length of the zoom lens becomes large. The diameter of the image side lens becomes likely be larger than the second lens group G _2, it is disadvantageous. Conditional expression (1
If the lower limit of 1), the focal length f ₁ of the first lens group G ₁
Is too small, the spherical aberration at the time of zooming becomes large in the negative direction, and the fluctuation of the coma becomes too large, which is inconvenient. Also, the Petzval sum tends to be excessively shifted to the positive side, which is inconvenient.

Such a type is suitable for a long focal length zoom lens, and it is desirable that the following conditional expression is satisfied. _{f t / L A> 7.0 (} 12) f W / L A> 3.5 (13) where, f _t: a screen diagonal length focal length L _A at the telephoto end of the entire zoom lens. If conditional expressions (11) and (12) are deviated, it is difficult not only to deviate from the aim of the present invention but also to correct various aberrations in a well-balanced manner. In particular, it becomes difficult to correct field curvature and coma.

When actually constructing a zoom lens,
In addition to the conditions described above, the first lens group G ₁ and the last lens group _GL are fixed, and the second lens group G ₂ and the third lens group G ₃ are moved, or the second lens group G 3 It is desirable that zooming be performed by moving the _second lens unit _GL and the last lens unit _GL . Also, when placing the third lens group G ₃ is preferably a substantially afocal between the third lens group G ₃ and the final lens group G _L. By adopting such a configuration, it is possible to simplify the mechanism for zooming.

Now, the shape of each group when each group is concretely described. For the final lens group G _L , the anti-vibration lens group G _{V is connected} to the most image side of the final lens group _GL. , Or on the image side of the convex lens group. When positioned on the image side of the convex lens group,
The converging action of the convex lens group is advantageous since it the lens diameter of the vibration reduction lens group G _V compact. Also, if the overall length and lens diameter of the final lens group _GL can be reduced,
The entire final lens group G _L may be a vibration reduction lens group G _V.

When the anti-vibration lens group G _V is composed of two lenses and has a positive refracting power, it is desirable to use a biconvex lens and a concave meniscus lens having a strong concave surface facing the object side. When the anti-vibration lens group G _{V includes} three lenses and has a positive refracting power, it is preferable to include a biconvex lens, a biconcave lens, and a convex lens. When the anti-vibration lens group G _V is composed of two lenses and has a negative refractive power, the anti-vibration lens group G _V
Has at least one concave lens and at least one
It is preferable to have two convex lenses.

Further, if a refractive power distribution type lens or an aspherical lens is used for any of the lenses constituting the zoom lens of the present invention, further excellent imaging performance and image stabilization performance can be obtained.
Note that, in the present invention, a method of moving the anti-vibration lens group G _V in a direction substantially orthogonal to the optical axis has been described, but the anti-vibration lens group G _V is centered on a predetermined point on or near the optical axis. The turning motion may be performed. In other words, by adding a tilt component in addition to the shift component and performing the anti-vibration driving, more excellent anti-vibration optical performance can be obtained. In addition, a portion of lens groups in the vibration reduction lens group G _V by eccentrically driven, it is possible to image stabilization. Note that any of the convex lens groups in the first lens group may be moved on the optical axis for focusing.

[0024]

Embodiments of the present invention will be described below. FIGS. 1, 4 and 7 are views showing the lens configuration of the zoom lens according to the first, second and third embodiments of the present invention, respectively. In each of the zoom lenses of the embodiments, the present invention is applied to a very long focal length super telephoto zoom lens. The zoom lens of the first embodiment, in order from the object side, a first lens group G _1, a second lens group G ₂ having a negative refractive power and a final lens group G _L. The zoom lens of the second embodiment and the third embodiment includes, in order from the object side, the third having a first lens group G _1, a second lens group G ₂ having a negative refractive power, positive refractive power a lens group G _3, comprising a final lens group G _L.

In each embodiment, the first lens group G ₁ includes, in order from the object side, a convex lens group G ₁₁ , a focusing lens group G _1N having a negative refractive power, and a convex lens group G ₁₂ . The final lens group G _L includes a vibration reduction lens group G _V. In each embodiment, focusing is performed by moving the focusing lens group G _1N in the optical axis direction, and image stabilization is performed by moving the image stabilizing lens group G _V in a direction substantially orthogonal to the optical axis. I have. In the first embodiment, the second lens group G ₂ and the final lens group G _L
Preparative and performing zooming by moving along the optical axis, in the second embodiment and the third embodiment, by moving the second lens group G ₂ and the third lens group G ₃ in the optical axis direction Is changing the magnification.

Tables 1 to 3 below show first to third, respectively.
The specifications of the embodiment will be described. In [Lens Specifications] of each table, the first column No is the number of each lens surface from the object side, the second column r is the radius of curvature of each lens surface, the third column d is the distance between each lens surface, and the fourth column.
The column ν _d is the Abbe number based on the d line (λ = 587.6 nm) of each lens, and the fifth column _nd and the sixth column _ng are the d line and g line (λ = 435.8 nm) of each lens, respectively. And the seventh column shows the group number to which each lens belongs. Also in [antivibration Data, the movement of the vibration reduction lens group G _V and the image is in the upper positive optical path diagram. Table 4 below shows various values related to the conditional expressions (1) to (13) and values of the conditional expressions (1) to (13).

[0027]

[Table 1] [Lens _{Data] No r d ν d n d} n g 1 662.5300 15.5000 82.52 1.497820 1.505265 G 11 2 -1317.3200 2.0000 3 366.1710 27.0000 82.52 1.497820 1.505265 G 11 4 -595.5800 8.2000 5 -550.7400 7.0000 35.19 1.749501 1.776948 G _{11 6 936.3600 0.3000 7 269.9760 19.0000 82.52} 1.497820 1.505265 G 11 8 4433.9970 (d 8) 9 -721.9200 4.5000 25.50 1.804581 1.846310 G 1N 10 -331.9570 3.8000 55.60 1.696800 1.712319 G 1N 11 147.0490 9.0000 12 -708.3800 9.8000 25.50 1.804581 1.846310 G 1N 13 - _{93.4900 2.8000 40.90 1.796310 1.821068 G 1N 14} 574.5604 (d 14) 15 2151.5997 4.2000 35.19 1.749501 1.776948 G 12 16 279.0760 11.6000 82.52 1.497820 1.505265 G 12 17 -133.6300 (d 17) 18 145.2250 7.3000 28.19 1.740000 1.774461 G 2 19 -190.6860 2.9000 51.09 1.733500 _{1.751403 G 2 20 103.6120 7.0000 21 -165.4190} 3.7000 45.37 1.796681 1.818801 G 2 22 338.4810 0.1000 23 88.7090 4.0000 32.17 1.672700 1.699894 G 2 24 91.6570 (d 24) 25 107.8234 8.9 000 60.03 1.640000 1.653133 _GL 26 -1108.1819 4.0000 40.90 1.796310 1.821068 _GL 27 108.4408 5.0000 26 195.2262 8.1000 70.41 1.487490 1.495932 _GL 29 -183.0491 3.0000 30 364.4336 5.7000 70.41 1.487490 1.495932 _GL G _V 31 -492.4989 4.0000 32.220 -220. _{1.616844 G L G V 33 263.8906 2.0000} 34 224.0339 5.7000 37.90 1.723421 1.748045 G L G V 35 -427.9968 (d 35) 36 ( aperture) 87.7401 37 (fixed throttle) 93.5094 38 ∞ 2.0000 64.10 1.516800 1.526703 39 ∞ 119.7163 [ variable Distances] the wide-angle end telephoto end _{d 8 174.55565 174.55565 d 14 16.15305 16.15305} d 17 84.61909 99.46369 d 24 53.41727 1.58577 d 35 25.68265 62.66245 [ antivibration data vibration reduction lens group G _V moving amount: [Delta] S = + 5 image moving amount wide angle end: + 3.970 Telephoto end: +4.395

[0028]

[Table 2] [Lens _{Data] No r d ν d n d} n g 1 308.9479 12.0000 82.52 1.497820 1.505260 G 11 2 -789.7229 0.5000 3 138.1325 5.6000 31.62 1.756920 1.787940 G 11 4 94.2767 20.0000 82.52 1.497820 1.565260 G 11 5 538.8153 (d _{5) 6 -2329.7471 3.5000 53.93 1.713000 1.729410} G 1N 7 163.1848 5.0000 8 -400.1187 3.5000 49.52 1.744430 1.763210 G 1N 9 142.8639 1.5000 10 147.9907 6.7000 31.08 1.688930 1.717750 G 1N 11 -903.7688 (d 11) 12 234.0780 5.5000 60.14 1.620410 1.633140 G 12 13 -708.1720 0.2000 14 186.2251 3.6000 27.61 1.755200 1.791120 G 12 15 125.5000 7.2000 82.52 1.497820 1.505260 G 12 16 -452.3328 (d 16) 17 7497.9146 2.1000 58.50 1.651600 1.665380 G 2 18 70.7008 5.0000 19 -75.6345 2.3000 53.93 1.713000 1.729410 G 2 20 65.0000 4.0000 23.01 _{1.860740 1.910650 G 2 21 332.1910 (d} 21) 22 182.5239 7.2000 58.54 1.612720 1.625690 G 3 23 -50.2000 2.4000 31.62 1.756920 1.787940 G 3 24 -130.1925 (d 24) 25 ( aperture stop Ri) 0.5000 26 112.9942 4.6000 82.52 1.497820 1.505260 G L 27 245.8845 2.0000 28 158.9831 3.0000 54.55 1.514540 1.526319 G L G V 29 477.1798 4.8000 30 300.0000 3.0000 38.03 1.603420 1.623810 G L G V 31 118.8950 4.0000 32 150.8241 4.0000 47.07 1.670030 1.688063 G L G V 33 -4987.1629 3.0000 34 (fixed throttle) 34.6000 35 153.6804 4.7000 53.48 1.547390 1.560219 G L 36 42.5831 2.0000 37 50.1508 1.8000 45.37 1.796680 1.818790 G L 38 47.4766 5.5000 69.98 1.518601 1.527667 G L 39 152.6898 131.3130 [ variable interval angle end telephoto end d _{5 68.43775 68.43775 d 11 26.85652 26.85652 d 16} 4.68513 50.91943 d 21 75.62639 1.23629 d 24 10.00216 38.15796 [ antivibration data vibration reduction lens group G _V moving amount: [Delta] S = + 2 images of moving amount: wide angle end: -1.404 telephoto end: - 1.404

[0029]

[Table 3] [Lens _{Data] No r d ν d n d} n g 1 308.9479 12.0000 82.52 1.497820 1.505260 G 11 2 -789.7229 0.5000 3 138.1325 5.6000 31.62 1.756920 1.787940 G 11 4 94.2767 20.0000 82.52 1.497820 1.505260 G 11 5 538.8153 (d _{5) 6 -2329.7471 3.5000 53.93 1.713000 1.729410} G 1N 7 163.1848 5.0000 8 -400.1187 3.5000 49.52 1.744430 1.763210 G 1N 9 142.8639 1.5000 10 147.9907 6.7000 31.08 1.688930 1.717750 G 1N 11 -903.7688 (d 11) 12 234.0780 5.5000 60.14 1.620410 1.633140 G 12 13 -708.1720 0.2000 14 186.2251 3.6000 27.61 1.755200 1.791120 G 12 15 125.5000 7.2000 82.52 1.497820 1.505260 G 12 16 -452.3328 (d 16) 17 7497.9146 2.1000 58.50 1.651600 1.665380 G 2 18 70.7008 5.0000 19 -75.6345 2.3000 53.93 1.713000 1.729410 G 2 20 65.0000 4.0000 23.01 _{1.860740 1.910650 G 2 21 332.1910 (d} 21) 22 182.5239 7.2000 58.54 1.612720 1.625690 G 3 23 -50.2000 2.4000 31.62 1.756920 1.787940 G 3 24 -130.1925 (d 24) 25 ( aperture stop Ri) 0.5000 26 101.9817 4.6000 82.52 1.497820 1.505260 G L 27 393.7533 2.0000 28 275.7897 3.0000 32.17 1.672700 1.699894 G L G V 29 784.8842 2.0000 30 700.0000 3.0000 39.82 1.869940 1.897730 G L G V 31 142.7415 4.0000 32 130.8911 4.0000 47.07 1.670030 1.688063 G L 33 2674.1894 3.0000 34 (fixed aperture) 34.6000 35 156.4656 4.7000 64.10 1.516800 1.526703 _GL 36 -129.8808 7.8415 37 -95.5445 1.8000 49.45 1.772789 1.792324 _GL 36 50.1655 5.5000 54.55 1.514540 1.526319 _GL 39 -139.3284 115.8756 [Variable interval] Wide angle end Tele end _{5 68.43775 68.43775 d 11 26.85652 26.85652 d 16} 4.68513 50.91943 d 21 75.62639 1.23629 d 24 14.49508 42.65088 [ antivibration data vibration reduction lens group G _V moving amount: [Delta] S = + 1.5 image moving amount: wide angle end: Tasu0.896 telephoto end: + 0.896

[0030]

[Table 4] Example No. 12 23 ΔS 5 21.5 f _L 171.689 225.000 225.000 f _V 433.887 272.470 -312.334 f _1N -122.298 -160.000 -160.000 f ₁ 895.485 235.000 235.000 f ₂ -116.401 -51.500 -51.500 f ₃ -160. 160.000 r _VL -427.997 -4987.1629 142.7415 L 18.4 18.8 8 Z 1.417 3.000 3.000 L _1N 174.556 68.438 68.438 f _W 1200.15 200.000 200.000 f _T 1699.706 599.998 599.998 L _A 43.2 43.2 43.2 (1) ΔS / | f _L | 0.0291 0.00889 0.00667 _{) | f V | / f L} 2.527 1.211 1.388 (3) | f 1N | / f 1 0.137 0.681 0.681 (4) | r VL / f V | 0.986 18.304 0.457 (5) L / f L 0.107 0.0836 0.0356 (6) Δn 0.107581 0.08888 0.19724 (7) Δν 34.9 16.52 7.65 (8) | f 2 | / f 1 0.130 0.219 0.219 (9) f L / f 3 - 1.406 1.406 (10) L 1N / f 1 0.195 0.291 0.291 (11) f _{1 / (f W · Z)} 0.527 0.392 0.392 (12) f t / L A 39.345 13.889 13.889 (13) f W / L A 27.781 4.630 4.6 30

FIGS. 2 and 3 show the spherical aberration, astigmatism, distortion, and lateral aberration of the first embodiment at the wide-angle end and the telephoto end, respectively. The lateral aberration (A) shows a state in which the anti-vibration lens group G _V is arranged on the optical axis, and the lateral aberration (B) shows the anti-vibration lens group G _V
5 shows a state in which _V is moved by ΔS in a direction perpendicular to the optical axis to perform image stabilization correction. Similarly, FIG. 5 and FIG.
8 and 9 show various aberrations at the wide angle end and the telephoto end of the embodiment.
9 shows various aberrations of the third embodiment at the wide-angle end and at the telephoto end, respectively. In each aberration diagram, F _NO represents an F number, and Y represents an image height. In the astigmatism diagram, a solid line S indicates a sagittal image plane,
A broken line M indicates a meridional image plane. As is clear from the aberration diagrams, in each example, various aberrations are satisfactorily corrected in each focal length state, even during image stabilization.

[0032]

According to the present invention, it is possible to provide a high-performance zoom lens having an image stabilizing function, having a long focal point, and suitable for photography and video.

[Brief description of the drawings]

FIG. 1 is a lens configuration diagram of a first embodiment according to the present invention.

FIG. 2 is a diagram showing various aberrations of the first embodiment at the wide-angle end according to the present invention.

FIG. 3 is a diagram showing various aberrations of the first embodiment at the telephoto end according to the present invention.

FIG. 4 is a lens configuration diagram of a second embodiment according to the present invention.

FIG. 5 is a diagram showing various aberrations of the second embodiment at the wide-angle end according to the present invention.

FIG. 6 is a diagram showing various aberrations of the second embodiment at the telephoto end according to the present invention.

FIG. 7 is a lens configuration diagram of a third embodiment according to the present invention.

FIG. 8 is a diagram showing various aberrations at the wide-angle end according to a third embodiment of the present invention.

FIG. 9 is a diagram showing various aberrations at the telephoto end of a third embodiment according to the present invention.

[Explanation of symbols]

G ₁第 first lens group G _1N合 focusing lens group G ₁₁ , G ₁₂凸 convex lens group G ₂ ２second lens group G ₃第 third lens group _GL最終 final lens group G _V振 vibration lens group S … Aperture stop FS… Fixed stop

Claims (8)

[Claims] 1. A and a second lens group G ₂ having a first lens group G ₁ and the negative refractive power in order from the object side, a zoom lens system having a final lens group G _L closest to the image side, the first One lens group G ₁ includes a focusing lens group G _1N having a negative refractive power, and the last lens group G _L is a vibration-proof lens group G _V
When focusing, the focusing lens group G _1N is moved in the direction of the optical axis, and when changing the magnification, at least the second lens group G ₂ is moved in the direction of the optical axis. characterized by moving the group G _V in a direction substantially perpendicular to the optical axis, a zoom lens with a vibration reduction function. Upon wherein the wide-angle end and the telephoto end f zooming, the first lens group G ₁ and the distance between the second lens group G ₂ increases,
The distance between the second lens group G ₂ and the lens unit located on the image side is changed, the zoom lens with a vibration reduction function according to claim 1, wherein. 3. A zoom lens having an image stabilizing function according to claim 1, wherein said zoom lens satisfies the following condition. ΔS / | f _L | <0.1 (1) where ΔS: the vibration-proof lens group G that moves during vibration-proof
The maximum displacement f _{L in} a direction substantially orthogonal to the optical axis of _V f _L : the focal length of the last lens group _GL . 4. A zoom lens having an image stabilizing function according to claim 1, wherein the following conditions are satisfied. _{0.2 <| f V | / f} L <10 (2) 0.05 <| f 1N | / f 1 <10 (3) where, f _V: focal length of the vibration reduction lens group G _V f _L: The focal length f _1N of the last lens group G _L : the focal length of the focusing lens group G _1N f ₁ : the focal length of the first lens group G ₁ . Between wherein said second lens group G ₂ and the final lens group G _L, a third lens group G ₃ having a positive refractive power, at least, as claimed in claim 1, 2, 3 or 4, wherein Zoom lens with anti-vibration function. Upon wherein zooming, the distance between the third lens group G ₃ and the lens unit located on the image side is changed, the zoom lens with a vibration reduction function according to claim 5, wherein. Wherein said first lens group G ₁ and the last lens group G
7. The zoom lens having an image stabilizing function according to claim 6, wherein _L is fixed in the optical axis direction during zooming. 8. A zoom lens having an anti-vibration function according to claim 1, further comprising a fixed stop fixed on the optical axis.