JP2010113179A - Compact high-magnification telephoto zoom lens having vibration isolation function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-magnification telephoto zoom lens which is suitable for a single-lens reflex camera using a solid imaging element or silver salt film, which has short optical full length and is compact, and which has, during vibration isolation, small performance degradation due to decentering and performance as good as that during non-vibration isolation. <P>SOLUTION: A zoom lens system includes a first lens group GR1 having a positive refractive power, a second lens group GR2 having a negative refractive power, a third lens group GR3 having a positive refractive power, a fourth lens group GR4 having a positive refractive power, and a fifth lens group GR5 having a negative refractive power in this order from an object side, and changes all intervals of these groups in varying the magnification from a wide angle end to a telephoto end. In the zoom lens system, a vibration isolation lens group GR4Y having a positive refractive power is included in a fourth lens group GR4 near a diaphragm STOP, and the vibration isolation lens group GR4Y is moved in the perpendicular direction VER to the optical axis to correct camera shake occurring during camera photographing. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a zoom lens for a single-lens reflex camera that uses a solid-state image sensor such as a silver salt film, CCD, or CMOS, and in particular, has an anti-vibration function while covering a super telephoto range where the focal length at the telephoto end is about 390 mm. The present invention relates to a compact high-magnification telephoto zoom lens having a vibration-proof function.

Conventionally, a high-magnification telephoto zoom lens having a zoom ratio of about 4 to 5 times and having an anti-vibration function and covering a focal length of about 390 mm at the telephoto end has been proposed in the following patent documents.
JP-A-11-258504 JP 2000-47107 A JP 2004-61605 A

  The high-magnification telephoto zoom lenses proposed in these patent documents have also succeeded in having good optical performance and a correction function when blurring occurs.

  However, all the conventional high-magnification telephoto zoom lenses have a problem that the total optical length from the wide-angle end to the telephoto end is long. For example, some have a total optical length of more than 320 mm at the telephoto end, and some have a problem that the wide-angle end exceeds 220 mm while the optical total length of the telephoto end is suppressed to about 270 mm. Furthermore, the anti-vibration lens group provided in order to provide an anti-vibration function that is essential for photographing with a high-magnification telephoto zoom lens uses all or a part of the negative lens group having a large diameter located closest to the object side. There is a problem that the image stabilization mechanism is increased in size because it is configured to correct camera shake. In addition, on the telephoto high-magnification zoom lens system, the positive lens group located closest to the object side has a structure that extends greatly toward the object side. Therefore, the zoom lens unit has a large anti-vibration mechanism immediately after the extension group. There was a problem that an increase in the diameter in the radial direction could not be avoided.

  The present invention has been proposed in view of the above circumstances, and relates to a zoom lens having five or more lens groups. The optical total length from the wide-angle end to the telephoto end is set by appropriately setting the lens arrangement and configuration of each lens group. While achieving high optical performance over the entire zoom range, the anti-vibration lens group is arranged on the image side as much as possible, and its configuration is set appropriately so that the anti-vibration mode An object of the present invention is to provide a compact high-magnification telephoto zoom lens that maintains the same high optical performance.

  In order to achieve the above object, the present invention is a compact high-magnification telephoto zoom lens having an anti-vibration function, and in order from the object side, a first lens group having a positive refractive power and a first lens group having a negative refractive power. 2 lens groups, a third lens group having a positive refractive power, a fourth lens group having a positive refractive power, and a fifth lens group having a negative refractive power, from the wide-angle end to the telephoto end. In zoom lens systems in which all the intervals of these groups change when zooming, the fourth lens group includes an anti-vibration lens group having a positive refractive power, and the anti-vibration lens group is disposed on the optical axis. On the other hand, it is moved in the vertical direction to correct camera shake that occurs during camera shooting.

In particular, it is preferable that the small high-magnification telephoto zoom lens having the above-described image stabilization function satisfies the following conditional expression.
(1) 0.35> | f2 / fW |> 0.2
(2) 0.6> | f2 / f3 |> 0.3
(3) f34W> f34T
Where fW: focal length at the wide-angle end of the zoom lens
f2: Focal length of the second lens group f3: Focal length of the third lens group f34W: Composite focal length of the third lens group and the fourth lens group at the wide-angle end f34T: Third lens group and fourth at the telephoto end Composite focal length of lens group

Furthermore, it is preferable that the anti-vibration lens group satisfies the following conditional expression.
(4) 1.3> | f4Y / f4 |> 0.85
Where f4: focal length of the fourth lens group f4Y: focal length of the anti-vibration lens group

The fourth lens group including the anti-vibration lens group includes at least one convex lens and one concave lens before and after the anti-vibration lens group, and has a concave lens on the object side of the anti-vibration lens group. It is more preferable that the following conditional expression is satisfied while being arranged.
(5) | f4X | + | f4Z |> 3 · f4Y
Where f4X: focal length of the fourth lens group object side f4Y: focal length of the anti-vibration lens group f4Z: focal length of the fourth lens group image side

  In the small high-magnification zoom lens having an image stabilization function according to the present invention, first, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a positive refraction. A third lens group having power, a fourth lens group having positive refracting power, and a fifth lens group having negative refracting power, and when zooming from the wide-angle end to the telephoto end, In addition to being able to set the lens arrangement and configuration of each lens group appropriately and shortening the overall optical length from the wide-angle end to the telephoto end, High optical performance can be achieved over the entire zoom range. Furthermore, an anti-vibration lens group consisting of positive refractive power that corrects camera shake caused by camera movement by moving it in a direction perpendicular to the optical axis is included in the fourth lens group in the vicinity of the stop, thereby preventing vibration. It is possible to provide a compact, high-magnification zoom lens having a compact anti-vibration function that can reduce the size of the mechanism and maintain high optical performance similar to that when non-anti-vibration.

  In particular, the compact high-magnification telephoto zoom lens having the image stabilization function according to the present invention satisfies the conditional expressions (1) to (3) above, and therefore the lens arrangement and configuration of each lens group are set to an optimum range. In addition, the optical total length from the wide-angle end to the telephoto end can be shortened, and high optical performance can be achieved over the entire zoom range.

  Furthermore, since the anti-vibration lens group satisfies the conditional expression (4) above, it is possible to maintain the same high optical performance as during non-vibration at the time of anti-vibration.

  Further, the fourth lens group including the anti-vibration lens group includes at least one convex lens and one concave lens before and after the anti-vibration lens group, and a concave lens is provided on the object side of the anti-vibration lens group. In addition to the arrangement, since the conditional expression (5) is satisfied, high optical performance similar to that at the time of non-vibration prevention can be reliably maintained during vibration isolation.

Hereinafter, some embodiments of a compact high-magnification telephoto zoom lens having an anti-vibration function according to the present invention will be described in detail.
1 is a lens configuration diagram in Example 1, FIG. 14 is a lens configuration diagram in Example 2, FIG. 27 is a lens configuration diagram in Example 3, and FIG. 40 is a lens configuration diagram in Example 4. is there.

  The small high-magnification telephoto zoom lens having the image stabilization function according to the present invention includes, for example, a first lens group having a positive refractive power in order from the object side as shown in FIGS. 1, 14, 27, and 40. GR1, a second lens group GR2 having a negative refractive power, a third lens group GR3 having a positive refractive power, a fourth lens group GR4 having a positive refractive power, and a fifth lens having a negative refractive power The zoom lens is composed of the lens group GR5, and by changing all the intervals of these groups, zooming is performed from the wide-angle end to the telephoto end, and a zoom ratio of about 4 to 5 times is obtained. The lens arrangement and configuration are set within an optimal range, and the configuration is advantageous for reducing the overall length of the zoom lens.

In particular, by including the anti-vibration lens group GR4Y having the positive refractive power in the fourth lens group GR4 having the positive refractive power, and moving the anti-vibration lens group GR4Y in the direction VER perpendicular to the optical axis, Corrects camera shake that occurs during camera shooting.
That is, the anti-vibration lens group GR4Y having the refractive power according to the present invention is included in the fourth lens group GR4 in the vicinity of the stop STOP, so that the anti-vibration lens group GR4Y is configured with a small optical system. The vibration lens group GR4Y is reduced in weight, size, and is advantageous in improving the follow-up speed.

Specifically, it is desirable that the compact high-magnification telephoto zoom lens having the image stabilization function according to the present invention is configured to satisfy the following conditional expressions (1) to (3).
(1) 0.35> | f2 / fW |> 0.2
(2) 0.6> | f2 / f3 |> 0.3
(3) f34W> f34T
Where fW: focal length of zoom lens wide-angle end f2: focal length of second lens group GR2 f3: focal length of third lens group GR3 f34W: synthesis of third lens group GR3 and fourth lens group GR4 at wide-angle end Focal length f34T: Combined focal length of the third lens group GR3 and the fourth lens group GR4 at the telephoto end

The conditional expression (1) appropriately defines the focal length range of the second lens group GR2. Exceeding the upper limit is not preferable because the power of the second lens group GR2 becomes weak and the entire length of the zoom lens system becomes long. If the value is below the lower limit, it is advantageous for miniaturization of the zoom lens, but it is not preferable because large spherical aberration and coma generated at the telephoto end are difficult to correct.
The conditional expression (2) appropriately defines the focal length ratio between the second lens group GR2 and the third lens group GR3. If the upper limit is exceeded, the optical total length can be shortened in combination with the conditional expression (1), but large astigmatism occurs at the wide-angle end, resulting in a large aberration fluctuation due to zooming and a factor of four. Therefore, it is difficult to achieve a zoom ratio of about 5 times. Below the lower limit, the entire length of the zoom lens system becomes longer, which is not preferable.
Conditional expression (3) appropriately defines the ratio of the combined focal length between the third lens group GR3 and the fourth lens group GR4 at the wide-angle end and the telephoto end. That is, in the range of the conditional expression (3), a lens group having a positive refractive power as a whole is composed of the third lens group GR3 having a positive refractive power and the fourth lens group GR4 having a positive refractive power. Dividing into two parts makes it possible to correct aberrations satisfactorily, which is advantageous for shortening the overall length of the zoom lens and improving performance.

In addition, it is desirable that the image stabilizing lens group GR4Y in the small high-magnification telephoto zoom lens having the image stabilizing function according to the present invention is specifically configured to satisfy the following conditional expression (4).
(4) 1.3> | f4Y / f4 |> 0.85
Where f4: focal length of the fourth lens group GR4 f4Y: focal length of the anti-vibration lens group GR4Y

  Conditional expression (4) appropriately defines the range of the focal length of the image stabilizing lens group GR4Y included in the fourth lens group GR4. Exceeding the upper limit is not preferable because the amount of movement of the image stabilizing lens group GR4Y during camera shake correction increases, and the unit of the image stabilizing lens group GR4Y increases. On the other hand, if the value is below the lower limit, various aberrations due to decentering during camera shake correction increase, making correction difficult, and increasing the sensitivity of image movement to the amount of movement of the anti-vibration lens group GR4Y. In particular, it is difficult to accurately control the correction at the wide-angle end where the movement amount is small, which is not preferable.

  In particular, the fourth lens group GR4 including the image stabilizing lens group GR4Y includes at least one convex lens and one concave lens before and after the image stabilizing lens group GR4Y, that is, on the object side and the image side, respectively ( For example, as shown in FIG. 1, the object side lens is composed of three lenses on the object side of the image stabilization lens group GR4Y and two images on the image side of the image stabilization lens group GR4Y. A concave lens.

Specifically, it is desirable to satisfy the following conditional expression (5).
(5) | f4X | + | f4Z |> 3 · f4Y
Where f4X: focal length of the fourth lens group object side portion GR4X f4Y: focal length of the image stabilizing lens group GR4Y f4Z: focal length of the fourth lens group image side portion GR4Z

Conditional expression (5) appropriately defines the range of the focal length in the fourth lens group GR4 including the image stabilizing lens group GR4Y.
The lens arrangement of each lens group is set in a range that satisfies the conditional expressions (1) to (3), and the image stabilizing lens group GR4Y and the fourth lens satisfy the conditional expressions (4) and (5). By adopting the configuration of the group GR4, it is possible to suppress the occurrence of various aberrations due to decentration during vibration prevention while achieving good performance during non-vibration prevention, and has a vibration isolation function that provides good optical performance. A small high-power telephoto zoom lens can be obtained.

  Tables 1 to 16 show numerical data for specifying a small high-magnification telephoto zoom lens having an image stabilization function according to the present invention (each example) and numerical values corresponding to the conditional expressions (1) to (5). Shown in In these tables, N is the surface number in order from the object side, r is the radius of curvature, d is the lens thickness and air spacing, nd is the refractive index at the d line, and νd is the Abbe number at the d line.

Example 1
Numerical data for specifying the small high-magnification telephoto zoom lens having the image stabilization function in Example 1 and numerical values corresponding to the conditional expressions (1) to (5) are shown in Tables 1 to 4 below. .

(First numerical table)

Table 2 shows variable intervals in zooming according to the first embodiment.

Table 3 shows the moving amount of the image with respect to the moving 0.2 mm of the image stabilizing lens group GR4Y in the first embodiment.

Table 4 shows numerical values obtained by the conditional expression in the first embodiment.

(Example 2)
Numerical data for specifying the small high-magnification telephoto zoom lens having the image stabilization function in Example 2 and numerical values corresponding to the conditional expressions (1) to (5) are shown in Tables 5 to 8 below. .

(Second numerical table)

Table 6 shows variable intervals in zooming according to the second embodiment.

Table 7 shows the image moving amount with respect to the moving 0.2 mm of the image stabilizing lens group GR4Y in the second embodiment.

Table 8 shows numerical values obtained by the conditional expression in the first embodiment.

(Example 3)
Numerical data for specifying the small high-magnification telephoto zoom lens having the image stabilization function in Example 3 and numerical values corresponding to the conditional expressions (1) to (5) are shown in Tables 9 to 12 below. .

(Third numerical table)

Table 10 shows variable intervals in zooming according to the third embodiment.

Table 11 shows the moving amount of the image with respect to the moving 0.2 mm of the image stabilizing lens group GR4Y in the third embodiment.

Table 12 shows numerical values obtained by the conditional expression in the third embodiment.

Example 4
Numerical data for specifying the small high-magnification telephoto zoom lens having the image stabilization function in Example 4 and numerical values corresponding to the conditional expressions (1) to (5) are shown in Tables 13 to 16 below. .

(4th numerical table)

Table 14 shows variable intervals in zooming of the fourth embodiment.

Table 15 shows the moving amount of the image with respect to the moving 0.2 mm of the image stabilizing lens group GR4Y in Example 4.

Table 16 shows numerical values obtained by the conditional expression in the fourth embodiment.

Hereinafter, the performance of a compact high-magnification telephoto zoom lens having an image stabilization function according to each embodiment of the present invention will be described with reference to the drawings. Here, a first embodiment of the present invention will be described with reference to FIGS.
The drawings showing the performance of the first embodiment will be described in detail. FIG. 1 is a configuration diagram at the wide-angle end of the compact high-magnification telephoto zoom lens having the image stabilization function in the first embodiment, and FIG. It is a spherical aberration, astigmatism, and distortion diagram at the time of non-vibration. FIG. 3 is a diagram showing spherical aberration, astigmatism, and distortion aberration when the telephoto end is not shake-proof in order from the left. The spherical aberration indicates the performance at the full aperture value, and the astigmatism diagram and the distortion diagram all show the performance in a state where the maximum image height is set to 21.63 mm. In the figure, S represents a sagittal image plane, and M represents a meridional image plane.
4 to 8 are lateral aberration diagrams at the wide-angle end. Y = 0.7F is 70% of the image height 21.63 mm, that is, 15.14 mm, and similarly Y = 0.5F is 10.82 mm. Become. 4A shows lateral aberrations when the image height is minus when correcting the blur angle of 0.8 ° (± 0.4 °), and FIG. 5B shows the blur angle of 0.4 ° (± 0.2 °). ) Lateral aberration when the image height is negative at the time of correction, FIG. 6 (c) is lateral aberration at the time of non-vibration prevention, and FIG. 7 (d) is when the blur angle is corrected by 0.4 ° (± 0.2 °). Lateral aberration when the image height is positive, FIG. 8E shows lateral aberration when the image height is positive when the blur angle is corrected by 0.8 ° (± 0.4 °).
9 to 13 are lateral aberration diagrams at the telephoto end. Y = 0.7F is 70% of the image height 21.63 mm, that is, 15.14 mm, and similarly Y = 0.5F is 10.82 mm. Become. FIG. 9A shows lateral aberrations when the image height is negative when correcting the blur angle of 0.8 ° (± 0.4 °), and FIG. 10B shows the blur angle of 0.4 ° (± 0.2 °). ) Lateral aberration when the image height is negative at the time of correction, FIG. 11 (c) is lateral aberration at the time of non-vibration prevention, and FIG. 12 (d) is when the blur angle is corrected by 0.4 ° (± 0.2 °). Lateral aberration when the image height is positive. FIG. 13E shows lateral aberration when the image height is positive when the blur angle is corrected by 0.8 ° (± 0.4 °).

  From these various aberration diagrams and lateral aberration diagrams, the compact high-magnification telephoto zoom lens having the image stabilization function according to Example 1 has various aberrations corrected well, and excellent results in both image stabilization and non-image stabilization. It was found to have image performance.

  The drawings showing the performance of Example 2 are shown in FIGS.

  The drawings showing the performance of Example 3 are shown in FIGS.

  The drawings showing the performance of Example 4 are shown in FIGS.

In addition, since any drawing of Example 2 thru | or Example 4 respond | corresponds with drawing which shows the performance of Example 1, the description is abbreviate | omitted.
In any of the embodiments, the compact high-magnification telephoto zoom lens having the image stabilization function according to the present invention has excellent image forming performance both during image stabilization and during non-image stabilization, with various aberrations corrected well. I understand that.

  Therefore, the small high-power zoom lens having the image stabilization function according to the present invention is configured by the five groups as described above, and when zooming from the wide-angle end to the telephoto end, It is configured so that the interval changes, and the image stabilizing lens group GR4Y having a positive refractive power is included inside the fourth lens group GR4 that is located closest to the image side and is near the stop STOP having a positive refractive power as a whole. Therefore, it is possible to contribute to the miniaturization of the vibration isolation mechanism, and it is possible to prevent the zoom lens unit from being enlarged in the radial direction and at the same time maintain the same high optical performance during vibration isolation as in non-vibration prevention. .

  Furthermore, since the conditional expressions (1) to (3) are satisfied, the lens arrangement and configuration of each lens group can be set within the optimum range, and the optical total length from the wide-angle end to the telephoto end can be shortened. As a result, high optical performance can be achieved over the entire zoom range. In addition, since the anti-vibration lens group GR4Y satisfies the conditional expression (4), high optical performance similar to that at the time of non-anti-vibration can be maintained at the time of anti-vibration.

  The fourth lens group GR4 including the anti-vibration lens group GR4Y includes at least one convex lens and one concave lens before and after the anti-vibration lens group GR4Y, and the anti-vibration lens group GR4Y Since the concave lens is arranged on the object side and the conditional expression (5) is satisfied, the anti-vibration lens group GR4Y is arranged in the vicinity of the stop STOP and contributes to the downsizing of the anti-vibration mechanism. In addition to correcting the camera shake that occurs, it is possible to reliably maintain the same high optical performance as during non-vibration prevention during image stabilization.

  If a compact high-power zoom lens having an anti-shake function is configured in this way, a compact high-power zoom lens having a compact anti-shake function can be provided.

  As mentioned above, although several embodiment of this invention was described, these are examples and are not limited to embodiment (Examples 1-4). Further, the embodiment of the present invention is an optical system having a five-group configuration, but is a small, high-magnification telephoto zoom lens having an anti-vibration function by adding an additional lens group to these five groups and further forming a multi-group configuration. However, it can be regarded as an equivalent optical system that exhibits the effects of the present invention.

FIG. 2 is a lens configuration diagram in Example 1. FIG. 5 is a diagram illustrating all aberrations at the wide-angle end of Example 1. FIG. 6 is a diagram illustrating all aberrations at the telephoto end according to Example 1. (A) is a lateral aberration diagram at the wide-angle end in Example 1, and shows lateral aberration when the image height is minus when the blur angle is corrected by 0.8 ° (± 0.4 °). FIG. 4B is a lateral aberration diagram at the wide-angle end in Example 1, and illustrates lateral aberration when the image height is minus when the blur angle is corrected by 0.4 ° (± 0.2 °). (C) is a lateral aberration diagram at the wide-angle end in Example 1, and is the lateral aberration at the time of non-vibration prevention. FIG. 6D is a lateral aberration diagram at the wide-angle end in Example 1, which is the lateral aberration at the time of image height plus when the blur angle is corrected by 0.4 ° (± 0.2 °). (E) is a lateral aberration diagram at the wide-angle end in Example 1, and is a lateral aberration at the time of image height plus when the blur angle is corrected by 0.8 ° (± 0.4 °). (A) is a lateral aberration diagram at the telephoto end in Example 1, and shows the lateral aberration when the image height is minus when the blur angle is corrected by 0.8 ° (± 0.4 °). FIG. 5B is a lateral aberration diagram at the telephoto end in Example 1, and illustrates lateral aberration when the image height is minus when the blur angle is corrected by 0.4 ° (± 0.2 °). (C) is a lateral aberration diagram at the telephoto end in Example 1, and is a lateral aberration at the time of non-vibration prevention. (D) is a lateral aberration diagram at the telephoto end in Example 1, and shows lateral aberration when the image height is positive when the blur angle is corrected by 0.4 ° (± 0.2 °). (E) is a lateral aberration diagram at the telephoto end in Example 1, and shows lateral aberration when the image angle is positive when the blur angle is corrected by 0.8 ° (± 0.4 °). 6 is a lens configuration diagram in Embodiment 2. FIG. FIG. 6 is a diagram illustrating all aberrations at the wide-angle end of Example 2. FIG. 6 is a diagram illustrating all aberrations at the telephoto end according to Example 2. (A) is a lateral aberration diagram at the wide-angle end in Example 2, and shows lateral aberration when the image height is minus when the blur angle is corrected by 0.8 ° (± 0.4 °). FIG. 6B is a lateral aberration diagram at the wide-angle end in Example 2, and illustrates the lateral aberration when the image height is minus when the blur angle is corrected by 0.4 ° (± 0.2 °). (C) is a lateral aberration diagram at the wide-angle end in Example 2, and is the lateral aberration at the time of non-vibration prevention. (D) is a lateral aberration diagram at the wide-angle end in Example 2, and is a lateral aberration when the image height is positive when the blur angle is corrected by 0.4 ° (± 0.2 °). (E) is a lateral aberration diagram at the wide-angle end in Example 2, and is the lateral aberration at the time of image height plus when the blur angle is corrected by 0.8 ° (± 0.4 °). (A) is a lateral aberration diagram at the telephoto end in Example 2, and shows the lateral aberration when the image height is minus when the blur angle is corrected by 0.8 ° (± 0.4 °). (B) is a lateral aberration diagram at the telephoto end in Example 2, and shows lateral aberration when the image height is minus when the blur angle is corrected by 0.4 ° (± 0.2 °). (C) is a lateral aberration diagram at the telephoto end of Example 2, and is a lateral aberration at the time of non-vibration prevention. (D) is a lateral aberration diagram at the telephoto end of Example 2, and shows lateral aberration when the image height is positive when the blur angle is corrected by 0.4 ° (± 0.2 °). (E) is a lateral aberration diagram at the telephoto end in Example 2, which is the lateral aberration at the time of image height plus when the blur angle is corrected by 0.8 ° (± 0.4 °). FIG. 6 is a lens configuration diagram in Example 3. FIG. 10 is a diagram illustrating all aberrations at the wide-angle end of Example 3. FIG. 10 is a diagram illustrating all aberrations at the telephoto end according to Example 3. (A) is a lateral aberration diagram at the wide-angle end in Example 3, and shows the lateral aberration when the image height is minus when the blur angle is corrected by 0.8 ° (± 0.4 °). FIG. 6B is a lateral aberration diagram at the wide-angle end in Example 3, and illustrates the lateral aberration when the image height is minus when the blur angle is corrected by 0.4 ° (± 0.2 °). (C) is a lateral aberration diagram at the wide-angle end in Example 3, and is the lateral aberration at the time of non-vibration prevention. (D) is a lateral aberration diagram at the wide-angle end in Example 3, and is the lateral aberration at the time of image height plus when the blur angle is corrected by 0.4 ° (± 0.2 °). (E) is a lateral aberration diagram at the wide-angle end in Example 3, which is the lateral aberration at the time of image height plus when the blur angle is corrected by 0.8 ° (± 0.4 °). (A) is a lateral aberration diagram at the telephoto end in Example 3, and shows the lateral aberration when the image height is minus when the blur angle is corrected by 0.8 ° (± 0.4 °). (B) is a lateral aberration diagram at the telephoto end in Example 3, and shows the lateral aberration when the image height is minus when the blur angle is corrected by 0.4 ° (± 0.2 °). (C) is a lateral aberration diagram at the telephoto end of Example 3, and is a lateral aberration at the time of non-vibration prevention. (D) is a lateral aberration diagram at the telephoto end in Example 3, which is the lateral aberration at the time of image height plus when the blur angle is corrected by 0.4 ° (± 0.2 °). (E) is a lateral aberration diagram at the telephoto end in Example 3, and is a lateral aberration at the time of image height plus when the blur angle is corrected by 0.8 ° (± 0.4 °). FIG. 6 is a lens configuration diagram in Example 4. FIG. 10 is a diagram illustrating all aberrations at the wide-angle end of Example 4. FIG. 6 is a diagram illustrating all aberrations at the telephoto end according to Example 4. (A) is a lateral aberration diagram at the wide-angle end in Example 4, and shows the lateral aberration when the image height is minus when the blur angle is corrected by 0.8 ° (± 0.4 °). FIG. 6B is a lateral aberration diagram at the wide-angle end in Example 4, and the lateral aberration when the image height is minus when the blur angle is corrected by 0.4 ° (± 0.2 °). (C) is a lateral aberration diagram at the wide-angle end in Example 4, and is the lateral aberration at the time of non-vibration prevention. (D) is a lateral aberration diagram at the wide-angle end in Example 4, and is the lateral aberration when the image height is positive when the blur angle is corrected by 0.4 ° (± 0.2 °). (E) is a lateral aberration diagram at the wide-angle end in Example 4, and the lateral aberration at the time of image height plus when the blur angle is corrected by 0.8 ° (± 0.4 °). (A) is a lateral aberration diagram at the telephoto end in Example 4, and shows the lateral aberration when the image height is minus when the blur angle is corrected by 0.8 ° (± 0.4 °). (B) is a lateral aberration diagram at the telephoto end in Example 4, which is lateral aberration when the image height is minus when the blur angle is corrected by 0.4 ° (± 0.2 °). (C) is a lateral aberration diagram at the telephoto end of Example 4, and is a lateral aberration at the time of non-vibration prevention. (D) is a lateral aberration diagram at the telephoto end in Example 4, which is lateral aberration at the time of image height plus when the blur angle is corrected by 0.4 ° (± 0.2 °). (E) is a lateral aberration diagram at the telephoto end in Example 4, and is the lateral aberration at the time of image height plus when the blur angle is corrected by 0.8 ° (± 0.4 °).

Explanation of symbols

GR1 1st lens group GR2 2nd lens group GR3 3rd lens group GR4 4th lens group GR4X 4th lens group Object side part GR4Y Anti-vibration lens group GR4Z 4th lens group Image side part GR5 5th lens group VER Vertical direction STOP Aperture Aperture

Claims (4)

In order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens having a positive refractive power In a zoom lens system that includes a group and a fifth lens group having negative refractive power, and in which all the intervals of these groups change when zooming from the wide-angle end to the telephoto end,
The fourth lens group includes an anti-vibration lens group having a positive refractive power,
This anti-vibration lens group is moved in the direction perpendicular to the optical axis to correct camera shake that occurs during camera shooting.
A compact high-magnification telephoto zoom lens having an anti-vibration function. 2. The compact high-magnification telephoto zoom lens having an image stabilization function according to claim 1, wherein the following conditional expression is satisfied.
(1) 0.35> | f2 / fW |> 0.2
(2) 0.6> | f2 / f3 |> 0.3
(3) f34W> f34T
Where fW: focal length at the wide-angle end of the zoom lens
f2: Focal length of the second lens group f3: Focal length of the third lens group f34W: Composite focal length of the third lens group and the fourth lens group at the wide-angle end f34T: Third lens group and fourth at the telephoto end Composite focal length of lens group 3. The compact high-magnification telephoto zoom lens having an anti-vibration function according to claim 1, wherein the anti-vibration lens group satisfies the following conditional expression.
(4) 1.3> | f4Y / f4 |> 0.85
Where f4: focal length of the fourth lens group f4Y: focal length of the anti-vibration lens group The fourth lens group including the image stabilizing lens group includes at least one convex lens and one concave lens before and after the image stabilizing lens group, and a concave lens on the object side of the image stabilizing lens group. And place
The compact high-magnification telephoto zoom lens having the image stabilization function according to any one of claims 1 to 3, wherein the following conditional expression is satisfied.
(5) | f4X | + | f4Z |> 3 · f4Y
Where f4X: focal length of the fourth lens group object side f4Y: focal length of the anti-vibration lens group f4Z: focal length of the fourth lens group image side

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