JP2015031951A - Zoom lens, optical device and method for manufacturing zoom lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a zoom lens or the like that has a chromatic aberration excellently corrected in both occasions of an anti-tremor and a non anti-tremor, and includes high optical performance.SOLUTION: A zoom lens has: a first lens group G1 that has a negative refractive power; a second lens group G2 that has a positive refractive power; a third lens group G3 that has the negative refractive power; and a fourth lens group G4 that has the positive refractive power, in order from an object side. Upon zooming from a wide-angle end state to a telephoto-end state, a space between the first lens group G1 and the second lens group G2 varies, a space between the second lens group G2 and the third lens group G3 varies and a space between the third lens group G3 and the fourth lens group G4 varies. The second lens group G2 has: a front side lens group G2F; an aperture stop S; and a rear side lens group G2R, in order from the object side. The front side lens group G2F and the rear side lens group G2R have at least one negative lens, respectively, and at least some lenses of the rear side lens group G2R move so as to include a component of a direction orthogonal to an optical axis.

Description

  The present invention relates to a zoom lens, an optical device, and a zoom lens manufacturing method suitable for an imaging device such as a digital camera, a video camera, and a silver salt film camera.

  In recent years, an image sensor used in an imaging apparatus such as a digital camera has been increased in the number of pixels. An imaging lens used in an imaging apparatus provided with a high-pixel imaging device is required to have high optical performance.

  Under such a background, in order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, and a positive refraction. There has been proposed a zoom lens that includes a fourth lens group having power and performs zooming from the wide-angle end state to the telephoto end state by changing the interval between adjacent lens groups. Further, as such a zoom lens, there has been proposed a lens that performs vibration isolation by moving a part of the lenses in the second lens group in a direction orthogonal to the optical axis (for example, see Patent Document 1). reference.).

International Publication No. 2012/086153

  However, it has been difficult for the conventional zoom lens as described above to sufficiently correct chromatic aberration both in the case of anti-vibration and in the case of non-vibration.

  Accordingly, the present invention has been made in view of the above-described problems, and a zoom lens having excellent optical performance by correcting chromatic aberration satisfactorily both at the time of anti-vibration and at the time of non-vibration, and an optical apparatus having the zoom lens And a method of manufacturing the zoom lens.

In order to solve the above problems, the present invention
In order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, and a fourth lens having a positive refractive power A group,
At the time of zooming from the wide-angle end state to the telephoto end state, the distance between the first lens group and the second lens group, the distance between the second lens group and the third lens group, and the third lens group The distance from the fourth lens group changes,
The second lens group includes, in order from the object side, a front lens group, an aperture stop, and a rear lens group.
The front lens group and the rear lens group each have at least one negative lens;
A zoom lens is provided in which at least a part of the lenses in the rear lens group moves so as to include a component in a direction orthogonal to the optical axis.

The present invention also provides
An optical apparatus comprising the zoom lens is provided.

The present invention also provides
In order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, and a fourth lens having a positive refractive power A zoom lens manufacturing method comprising:
The second lens group includes, in order from the object side, a front lens group, an aperture stop, and a rear lens group.
The front lens group and the rear lens group each have at least one negative lens;
At the time of zooming from the wide-angle end state to the telephoto end state, the distance between the first lens group and the second lens group, the distance between the second lens group and the third lens group, and the third lens group The distance from the fourth lens group is changed,
A zoom lens manufacturing method is provided, wherein at least some of the lenses in the rear lens group are moved so as to include a component in a direction orthogonal to the optical axis.

  According to the present invention, there is provided a zoom lens that has excellent optical performance by properly correcting chromatic aberration both in anti-vibration and non-vibration, an optical device having the zoom lens, and a method for manufacturing the zoom lens. can do.

FIGS. 1A and 1B are sectional views of the zoom lens according to the first example of the present application in the wide-angle end state and the telephoto end state, respectively. FIGS. 2A and 2B are graphs showing various aberrations when the zoom lens according to Example 1 of the present application is focused on an object at infinity in the wide-angle end state and the telephoto end state, respectively. 3 (a) and 3 (b) show coma aberration when image stabilization is performed at the time of focusing on an object at infinity in the wide-angle end state and the telephoto end state of the zoom lens according to Example 1 of the present application, respectively. FIG. FIGS. 4A and 4B are sectional views of the zoom lens according to the second example of the present application in the wide-angle end state and the telephoto end state, respectively. FIGS. 5A and 5B are graphs showing various aberrations during focusing on an object at infinity in the wide-angle end state and the telephoto end state of the zoom lens according to Example 2 of the present application, respectively. FIGS. 6A and 6B are coma aberrations when the image stabilization is performed at the time of focusing on an object at infinity in the wide-angle end state and the telephoto end state of the zoom lens according to Example 2 of the present application, respectively. FIG. FIGS. 7A and 7B are sectional views of the zoom lens according to the third example of the present application in the wide-angle end state and the telephoto end state, respectively. FIGS. 8A and 8B are graphs showing various aberrations at the time of focusing on an object at infinity in the wide-angle end state and the telephoto end state of the zoom lens according to Example 3 of the present application, respectively. FIGS. 9A and 9B are coma aberrations when the image stabilization is performed at the time of focusing on an object at infinity in the wide-angle end state and the telephoto end state of the zoom lens according to the third example of the present application, respectively. FIG. FIGS. 10A and 10B are sectional views of the zoom lens according to the fourth example of the present application in the wide-angle end state and the telephoto end state, respectively. FIGS. 11A and 11B are graphs showing various aberrations at the time of focusing on an object at infinity in the wide-angle end state and the telephoto end state of the zoom lens according to Example 4 of the present application, respectively. 12 (a) and 12 (b) show coma aberration when the image stabilization is performed at the time of focusing on an object at infinity in the wide-angle end state and the telephoto end state of the zoom lens according to the fourth example of the present application, respectively. FIG. FIGS. 13A and 13B are sectional views of the zoom lens according to the fifth example of the present application in the wide-angle end state and the telephoto end state, respectively. FIGS. 14A and 14B are graphs showing various aberrations when the zoom lens according to Example 5 of the present application is focused on an object at infinity in the wide-angle end state and the telephoto end state, respectively. FIGS. 15A and 15B are coma aberrations when the image stabilization is performed at the time of focusing on an object at infinity in the wide-angle end state and the telephoto end state of the zoom lens according to Example 5 of the present application, respectively. FIG. FIGS. 16A and 16B are cross-sectional views of the zoom lens according to the sixth example of the present application in the wide-angle end state and the telephoto end state, respectively. FIGS. 17A and 17B are graphs showing various aberrations when the zoom lens according to Example 6 of the present application is focused on an object at infinity in the wide-angle end state and the telephoto end state, respectively. 18 (a) and 18 (b) show coma aberration when image stabilization is performed at the time of focusing on an object at infinity in the wide-angle end state and the telephoto end state of the zoom lens according to Example 6 of the present application, respectively. FIG. FIGS. 19A and 19B are cross-sectional views of the zoom lens according to the seventh example of the present application in the wide-angle end state and the telephoto end state, respectively. FIGS. 20A and 20B are graphs showing various aberrations when the zoom lens according to the seventh example of the present application is focused on an object at infinity in the wide-angle end state and the telephoto end state, respectively. FIGS. 21 (a) and 21 (b) show coma aberration when image stabilization is performed at the time of focusing on an object at infinity in the wide-angle end state and the telephoto end state of the zoom lens according to Example 7 of the present application, respectively. FIG. FIG. 22 is a diagram illustrating a configuration of a camera including the zoom lens of the present application. FIG. 23 is a diagram showing an outline of the manufacturing method of the zoom lens of the present application.

Hereinafter, the zoom lens, the optical device, and the zoom lens manufacturing method of the present application will be described.
The zoom lens of the present application includes, in order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, and a positive refraction. A fourth lens group having power, and at the time of zooming from the wide-angle end state to the telephoto end state, the distance between the first lens group and the second lens group, the second lens group and the third lens And the distance between the third lens group and the fourth lens group is changed, and the second lens group includes, in order from the object side, a front lens group, an aperture stop, and a rear lens group. The front lens group and the rear lens group each have at least one negative lens, and at least some of the lenses in the rear lens group include a component in a direction perpendicular to the optical axis. It is characterized by moving. Here, the front lens group refers to a lens group including optical elements arranged on the object side of the aperture stop in the second lens group. Further, the rear lens group refers to a lens group including optical elements arranged on the image side from the aperture stop in the second lens group.

  As described above, the zoom lens of the present application moves so that at least a part of the lenses in the rear lens group includes a component in a direction orthogonal to the optical axis as a vibration-proof lens group. Accordingly, it is possible to correct image blur due to camera shake, vibration, or the like, that is, to perform image stabilization.

As described above, in the zoom lens according to the present application, the second lens group includes, in order from the object side, the front lens group, the aperture stop, and the rear lens group, and the front lens group and the rear lens group are at least one. Each has two negative lenses. With this configuration, it is possible to achieve both correction of axial chromatic aberration and lateral chromatic aberration during non-vibration and correction of axial chromatic aberration and lateral chromatic aberration during image stabilization.
With the above-described configuration, it is possible to realize a zoom lens having excellent optical performance by correcting chromatic aberration satisfactorily both during image stabilization and during non-image stabilization.

In the zoom lens of the present application, it is desirable that the front lens group has a positive refractive power. With this configuration, the second lens group can have a positive refractive power.
In the zoom lens of the present application, it is preferable that the rear lens group has a positive refractive power. With this configuration, the second lens group can have a positive refractive power.

  In the zoom lens according to the present application, the second lens group includes, in order from the object side, a front lens group having a positive refractive power, an aperture stop, and a rear lens group having a positive refractive power. desirable. With this configuration, it is easy to maintain the symmetry by sharing the refractive power back and forth within the second lens group with the aperture stop as the center, and it is possible to make a good correction by balancing the correction of spherical aberration and coma.

The zoom lens of the present application preferably includes at least one positive lens and one negative lens in the front lens group and the rear lens group in the second lens group. With this configuration, the degree of freedom of chromatic aberration correction can be secured as compared with a single lens, and therefore the refractive index and Abbe number of each lens constituting the front lens group and the rear lens group can be set appropriately. . In addition, since the rear lens group has at least one positive lens and one negative lens, the correction of axial chromatic aberration and lateral chromatic aberration at the time of non-vibration is prevented while increasing the refractive power of the anti-vibration lens group. It is possible to more preferably achieve both the longitudinal chromatic aberration and the correction of the lateral chromatic aberration during shaking.
In the zoom lens of the present application, it is desirable that the front lens group and the rear lens group are composed of one positive lens and one negative lens. Further, it is desirable that each of the front lens group and the rear lens group is composed of one cemented lens. Further, the second lens group is arranged in order from the object side, positive lens, negative lens, aperture stop, negative lens, positive lens, or in order from the object side, negative lens, positive lens, aperture stop, positive lens, It is desirable to arrange a negative lens from the viewpoint of symmetry.

In addition, it is desirable that the zoom lens of the present application satisfies the following conditional expression (1).
(1) 1.00 <| f2i | / fw <4.00
However,
f2i: focal length of the rear lens group fw: focal length of the zoom lens in the wide-angle end state

  Conditional expression (1) is a conditional expression that defines the focal length of the rear lens group in the second lens group. The zoom lens of the present application can satisfactorily correct coma and spherical aberration by satisfying conditional expression (1).

  If the corresponding value of the conditional expression (1) of the zoom lens of the present application is below the lower limit value, the sensitivity of decentration of the rear lens group increases, that is, when the rear lens group is decentered due to a manufacturing error or the like. Aberration tends to occur. As a result, coma is deteriorated. In order to secure the effect of the present application, it is more preferable to set the lower limit of conditional expression (1) to 1.50. In order to secure the effect of the present application, it is more preferable to set the lower limit of conditional expression (1) to 2.00.

  On the other hand, when the corresponding value of the conditional expression (1) of the zoom lens of the present application exceeds the upper limit value, the movement amount of the anti-vibration lens group which is at least a part of the lenses in the rear lens group during the anti-vibration increase. For this reason, it becomes difficult to reduce the outer diameter and the overall length of the zoom lens of the present application. Further, the refractive power of the rear lens group becomes small. Therefore, if the refractive power of the front lens group is increased in order to secure the refractive power of the second lens group, the spherical aberration and the coma aberration will be deteriorated. In order to secure the effect of the present application, it is more preferable to set the upper limit of conditional expression (1) to 3.50. In order to secure the effect of the present application, it is more preferable to set the upper limit of conditional expression (1) to 3.20.

In addition, it is desirable that the zoom lens of the present application satisfies the following conditional expression (2).
(2) 0.50 <| f2i | / f2 <5.00
However,
f2i: focal length of the rear lens group f2: focal length of the second lens group

  Conditional expression (2) is a conditional expression that defines the focal length of the rear lens group in the second lens group. The zoom lens of the present application can satisfactorily correct coma and spherical aberration by satisfying conditional expression (2).

  If the corresponding value of the conditional expression (2) of the zoom lens of the present application is below the lower limit value, the refractive power of the rear lens group increases and the refractive power of the front lens group decreases, leading to deterioration of spherical aberration and coma aberration. I will. In order to secure the effect of the present application, it is more preferable to set the lower limit of conditional expression (2) to 1.00. In order to secure the effect of the present application, it is more preferable to set the lower limit of conditional expression (2) to 1.50.

  On the other hand, if the corresponding value of the conditional expression (2) of the zoom lens of the present application exceeds the upper limit value, the refractive power of the rear lens group decreases and the refractive power of the front lens group increases, leading to deterioration of coma aberration. End up. In order to secure the effect of the present application, it is more preferable to set the upper limit of conditional expression (2) to 4.00. In order to secure the effect of the present application, it is more preferable to set the upper limit of conditional expression (2) to 3.00. In order to further secure the effect of the present application, it is more preferable to set the upper limit of conditional expression (2) to 2.50.

Moreover, it is desirable that the zoom lens of the present application satisfies the following conditional expression (3).
(3) 1.00 <m12 / fw <2.00
However,
m12: Amount of change fw from the wide-angle end state to the telephoto end state of the distance on the optical axis from the most image side lens surface in the first lens group to the most object side lens surface in the second lens group: The focal length of the zoom lens in the wide-angle end state

  Conditional expression (3) is a conditional expression that defines the amount of change in the air gap between the first lens group and the second lens group during zooming from the wide-angle end state to the telephoto end state. By satisfying conditional expression (3), the zoom lens of the present application can satisfactorily correct spherical aberration, coma aberration, chromatic aberration, and field curvature while preventing an increase in the total length of the zoom lens of the present application.

  When the corresponding value of conditional expression (3) of the zoom lens of the present application is less than the lower limit value, the refractive power of each lens group increases or the amount of movement of each lens group during zooming increases. For this reason, an increase in the eccentric sensitivity and an increase in the total length of the zoom lens of the present application are caused. Further, the optical performance is deteriorated, specifically, the spherical aberration, the coma aberration, and the chromatic aberration are deteriorated. In particular, when the refractive power of the third lens group increases, the field curvature is deteriorated. In order to secure the effect of the present application, it is more preferable to set the lower limit of conditional expression (3) to 1.20. In order to secure the effect of the present application, it is more preferable to set the lower limit of conditional expression (3) to 1.40. In order to further secure the effect of the present application, it is more preferable to set the lower limit of conditional expression (3) to 1.45.

  On the other hand, if the corresponding value of conditional expression (3) of the zoom lens of the present application exceeds the upper limit value, the total length of the zoom lens of the present application increases. For this reason, it becomes difficult to shorten the overall length of the zoom lens of the present application and to reduce the outer diameter. In particular, in the telephoto end state, the distance between the lens group (the third lens group or the fourth lens group) disposed on the image side from the second lens group and the aperture stop increases, and thus the lens group (third lens group). Alternatively, the sensitivity of the decentered field curvature of the fourth lens group) increases. In order to secure the effect of the present application, it is more preferable to set the upper limit of conditional expression (3) to 1.80. In order to secure the effect of the present application, it is more preferable to set the upper limit of conditional expression (3) to 1.65.

  In the zoom lens of the present application, the first lens group, the second lens group, and the third lens move along the optical axis during zooming from the wide-angle end state to the telephoto end state, and the fourth lens It is desirable that the position of the group is fixed. With this configuration, the sensitivity of decentering coma aberration can be reduced by fixing the fourth lens group at the time of zooming.

  In the zoom lens of the present application, it is desirable that the front lens group has at least two lenses and has at least one aspherical surface. Chromatic aberration can be favorably corrected by combining at least two lenses, particularly a positive lens and a negative lens. Moreover, spherical aberration and coma can be favorably corrected by having at least two lenses and having at least one aspherical surface. Furthermore, the front lens group can be configured to have a minimum number of lenses by configuring the front lens group with two lenses.

  The optical apparatus of the present application is characterized by having the zoom lens having the above-described configuration. As a result, it is possible to realize an optical device having high optical performance by correcting chromatic aberration well both in the case of anti-vibration and in the case of non-vibration.

  The zoom lens manufacturing method of the present application includes, in order from the object side, a first lens group having negative refractive power, a second lens group having positive refractive power, and a third lens group having negative refractive power; A method of manufacturing a zoom lens having a fourth lens group having a positive refractive power, wherein the second lens group includes a front lens group, an aperture stop, and a rear lens group in order from the object side. The front lens group and the rear lens group each have at least one negative lens, and at the time of zooming from the wide-angle end state to the telephoto end state, the first lens group and the second lens group The distance between the second lens group and the third lens group, and the distance between the third lens group and the fourth lens group, and at least a part of the rear lens group. The component in the direction perpendicular to the optical axis of the lens It is characterized in that to move unnecessarily. As a result, it is possible to manufacture a zoom lens having high optical performance by correcting chromatic aberration well both during and without image stabilization.

Hereinafter, zoom lenses according to numerical examples of the present application will be described with reference to the accompanying drawings.
(First embodiment)
FIGS. 1A and 1B are sectional views of the zoom lens according to the first example of the present application in the wide-angle end state and the telephoto end state, respectively. 1 and FIGS. 4, 7, 10, 13, 16, and 19, which will be described later, indicate the movement trajectory of each lens group during zooming from the wide-angle end state to the telephoto end state.
The zoom lens according to the present embodiment includes a first lens group G1 having a negative refractive power, a second lens group G2 having a positive refractive power, a third lens group G3 having a negative refractive power, and a positive It is composed of a fourth lens group G4 having refractive power.

  The first lens group G1, in order from the object side, includes a negative meniscus lens L11 having a convex surface directed toward the object side, a negative meniscus lens L12 having a convex surface directed toward the object side, and a positive meniscus lens L13 having a convex surface directed toward the object side. Consists of. The negative meniscus lens L12 is a glass mold aspheric lens in which the object-side and image-side lens surfaces are aspherical.

The second lens group G2 includes, in order from the object side, a front lens group G2F having a positive refractive power, an aperture stop S, and a rear lens group G2R having a positive refractive power.
The front lens group G2F includes, in order from the object side, a cemented lens of a biconvex positive lens L21 and a negative meniscus lens L22 having a concave surface facing the object side. The positive lens L21 is a glass mold aspheric lens having an aspheric lens surface on the object side.
The rear lens group G2R includes, in order from the object side, a cemented lens of a negative meniscus lens L23 having a convex surface facing the object side and a biconvex positive lens L24.

  The third lens group G3 includes a negative meniscus lens L31 having a convex surface directed toward the object side. The negative meniscus lens L31 is a glass mold aspheric lens in which the object-side and image-side lens surfaces are aspherical.

  The fourth lens group G4 includes a positive meniscus lens L41 having a convex surface directed toward the image side. The positive meniscus lens L41 is a glass mold aspheric lens in which the object-side and image-side lens surfaces are aspherical.

  With the above configuration, in the zoom lens according to the present embodiment, the air gap between the first lens group G1 and the second lens group G2 decreases during zooming from the wide-angle end state to the telephoto end state, and the second lens The first lens group G1 moves along the optical axis so that the air gap between the group G2 and the third lens group G3 increases and the air gap between the third lens group G3 and the fourth lens group G4 increases. The second lens group G2 and the third lens group G3 move toward the object side along the optical axis. The position of the fourth lens group G4 is fixed at the time of zooming. In addition, the front lens group G2F, the aperture stop S, and the rear lens group G2R of the second lens group G2 move together during zooming.

  In the zoom lens according to the present embodiment, the third lens group G3 is moved to the image side along the optical axis, thereby focusing from an object at infinity to a near object.

  Further, the zoom lens according to the present embodiment performs image stabilization by moving the rear lens group G2R in the second lens group G2 as an image stabilization lens group so as to include a component in a direction orthogonal to the optical axis.

Table 1 below lists values of specifications of the zoom lens according to the present example.
In Table 1, f indicates the focal length, and BF indicates the back focus (the distance on the optical axis between the lens surface closest to the image side and the image plane I).
In [Surface data], the surface number is the order of the optical surfaces counted from the object side, r is the radius of curvature, d is the surface interval (the interval between the nth surface (n is an integer) and the n + 1th surface), and nd is The refractive index for d-line (wavelength 587.6 nm) and νd indicate the Abbe number for d-line (wavelength 587.6 nm), respectively. Further, the object plane indicates the object plane, the variable indicates the variable plane spacing, the stop S indicates the aperture stop S, and the image plane indicates the image plane I. The radius of curvature r = ∞ indicates a plane. For the aspherical surface, * is added to the surface number, and the value of the paraxial radius of curvature is indicated in the column of the radius of curvature r. Description of air refractive index nd = 1.000 is omitted.

[Aspherical data] shows an aspherical coefficient and a conic constant when the shape of the aspherical surface shown in [Surface data] is expressed by the following equation.
x = (h ² / r) / [1+ {1−κ (h / r) ² } ^1/2 ]
+ A4h ⁴ + A6h ⁶ + A8h ⁸ + A10h ¹⁰ + A12h ¹²
Here, h is the height in the direction perpendicular to the optical axis, x is the distance (sag amount) from the tangent plane of the apex of the aspheric surface to the aspheric surface at the height h, and κ is the conic constant. , A4, A6, A8, A10, A12 are aspherical coefficients, and r is the radius of curvature of the reference sphere (paraxial radius of curvature). “E−n” (n is an integer) indicates “× 10 ⁻ⁿ ”, for example “1.234E-05” indicates “1.234 × 10 ⁻⁵ ”. The secondary aspherical coefficient A2 is 0 and is not shown.

In [various data], FNO is the F number, 2ω is the angle of view (unit is “°”), Y is the image height, TL is the total length of the zoom lens according to the present embodiment (light from the first surface to the image surface I). (Distance on the axis), dn indicates a variable distance between the nth surface and the (n + 1) th surface, respectively. W represents the wide-angle end state, M represents the intermediate focal length state, and T represents the telephoto end state. D represents the distance from the object to the first surface.
[Lens Group Data] indicates the start surface and focal length of each lens group.
In [Anti-Vibration Data], Z is the shift amount of the rear lens group G2R which is an anti-vibration lens group, that is, the movement amount in the direction perpendicular to the optical axis, and [theta] is the angle of rotation blur of the zoom lens according to the present embodiment ( (Inclination angle, unit is “°”), and K is an anti-vibration coefficient.
[Conditional Expression Corresponding Value] indicates the corresponding value of each conditional expression of the zoom lens according to the present embodiment.

Here, the focal length f, the radius of curvature r, and other length units listed in Table 1 are generally “mm”. However, the optical system is not limited to this because an equivalent optical performance can be obtained even when proportionally enlarged or proportionally reduced.
In addition, the code | symbol of Table 1 described above shall be similarly used also in the table | surface of each Example mentioned later.

(Table 1) First Example
[Surface data]
Surface number r d nd νd
Object ∞

1 72.401 0.800 1.603 65.440
2 8.933 3.247
* 3 81.430 1.000 1.623 58.163
* 4 14.381 0.217
5 11.610 2.300 2.001 25.455
6 16.466 Variable

* 7 17.188 2.688 1.623 58.163
8 -8.884 0.800 1.603 38.028
9 -46.602 1.500
10 (Aperture S) ∞ 2.989
11 18.062 0.800 1.583 46.422
12 6.945 3.024 1.498 82.570
13 -30.319 Variable

* 14 95.105 0.800 1.623 58.163
* 15 11.725 Variable

* 16 -30.246 2.900 1.583 59.460
* 17 -11.506 BF

Image plane ∞

[Aspherical data]
Surface number κ A4 A6 A8 A10
3 1.000E + 00 -1.341E-04 4.946E-06 -2.851E-08 0.000E + 00
4 1.000E + 00 -1.733E-04 4.608E-06 -2.877E-09 -4.422E-10
7 1.000E + 00 -6.445E-05 -1.030E-06 3.176E-08 1.259E-11
14 1.000E + 00 5.106E-04 -1.420E-05 -1.448E-07 1.178E-08
15 1.000E + 00 7.701E-04 -1.866E-05 1.925E-07 0.000E + 00
16 1.000E + 00 1.161E-04 1.252E-06 -3.371E-08 1.439E-10
17 1.000E + 00 1.152E-04 1.558E-06 -2.620E-08 8.016E-11

[Various data]
Scaling ratio 2.83

W T
f 10.3 29.1
FNO 3.56 5.66
2ω 77.0 ° 31.4 °
Y 8.19 8.19

(When focusing on an object at infinity)
W M T
f 10.300 18.383 29.100
d6 17.948 7.230 2.253
d13 1.600 6.325 11.865
d15 5.138 7.347 10.568
BF 13.299 13.299 13.299
TL 47.750 43.966 47.750

(When focusing on a short distance object)
W M T
D 200.000 200.000 200.000
d6 17.948 7.230 2.253
d13 2.070 7.693 15.083
d15 4.668 5.979 7.349
BF 13.299 13.299 13.299
TL 47.750 43.966 47.750

[Lens group data]
Group start surface f
1 1 -14.141
2 7 13.652
3 14 -21.559
4 16 30.130

[Anti-vibration data]
W M T
f 10.300 18.383 29.100
Z 0.142 0.148 0.171
θ 0.624 0.500 0.500
K 0.789 1.087 1.485

[Conditional expression values]
(1) | f2i | /fw=2.718
(2) | f2i | / f2 = 2.051
(3) m12 / fw = 1.524

FIGS. 2A and 2B are graphs showing various aberrations when the zoom lens according to Example 1 of the present application is focused on an object at infinity in the wide-angle end state and the telephoto end state, respectively.
3 (a) and 3 (b) respectively perform vibration isolation against 0.624 ° rotational blur when focusing on an object at infinity in the wide-angle end state of the zoom lens according to Example 1 of the present application. FIG. 7 is a coma aberration diagram when the object is in focus, and a coma aberration diagram when the image stabilization is performed for a rotational shake of 0.500 ° when an object at infinity is focused in the telephoto end state.

  In each aberration diagram, FNO represents an F number, and Y represents an image height. d indicates the aberration at the d-line (wavelength 587.6 nm), g indicates the aberration at the g-line (wavelength 435.8 nm), and those without d and g indicate the aberration at the d-line. In the astigmatism diagram, the solid line indicates the sagittal image plane, and the broken line indicates the meridional image plane. The coma aberration diagram shows coma aberration at each image height Y. Note that the same reference numerals as in this embodiment are used in the aberration diagrams of each embodiment described later.

  From each aberration diagram, the zoom lens according to the present example has high optical performance with various aberrations corrected well from the wide-angle end state to the telephoto end state, and also has high optical performance even during image stabilization. I understand that.

(Second embodiment)
FIGS. 4A and 4B are sectional views of the zoom lens according to the second example of the present application in the wide-angle end state and the telephoto end state, respectively.
The zoom lens according to the present embodiment includes a first lens group G1 having a negative refractive power, a second lens group G2 having a positive refractive power, a third lens group G3 having a negative refractive power, and a positive It is composed of a fourth lens group G4 having refractive power.

  The first lens group G1, in order from the object side, includes a negative meniscus lens L11 having a convex surface directed toward the object side, a negative meniscus lens L12 having a convex surface directed toward the object side, and a positive meniscus lens L13 having a convex surface directed toward the object side. Consists of. The negative meniscus lens L12 is a glass mold aspheric lens in which the object-side and image-side lens surfaces are aspherical.

The second lens group G2 includes, in order from the object side, a front lens group G2F having a positive refractive power, an aperture stop S, and a rear lens group G2R having a positive refractive power.
The front lens group G2F includes, in order from the object side, a cemented lens of a biconvex positive lens L21 and a negative meniscus lens L22 having a concave surface facing the object side. The positive lens L21 is a glass mold aspheric lens having an aspheric lens surface on the object side.
The rear lens group G2R includes, in order from the object side, a cemented lens of a biconvex positive lens L23 and a negative meniscus lens L24 having a concave surface facing the object side.

  The third lens group G3 includes a negative meniscus lens L31 having a convex surface directed toward the object side. The negative meniscus lens L31 is a glass mold aspheric lens in which the object-side and image-side lens surfaces are aspherical.

  The fourth lens group G4 includes a positive meniscus lens L41 having a convex surface directed toward the image side. The positive meniscus lens L41 is a glass mold aspheric lens in which the object-side and image-side lens surfaces are aspherical.

  With the above configuration, in the zoom lens according to the present embodiment, the air gap between the first lens group G1 and the second lens group G2 decreases during zooming from the wide-angle end state to the telephoto end state, and the second lens The first lens group G1 moves along the optical axis so that the air gap between the group G2 and the third lens group G3 increases and the air gap between the third lens group G3 and the fourth lens group G4 increases. The second lens group G2 and the third lens group G3 move toward the object side along the optical axis. The position of the fourth lens group G4 is fixed at the time of zooming. In addition, the front lens group G2F, the aperture stop S, and the rear lens group G2R of the second lens group G2 move together during zooming.

  In the zoom lens according to the present embodiment, the third lens group G3 is moved to the image side along the optical axis, thereby focusing from an object at infinity to a near object.

Further, the zoom lens according to the present embodiment performs image stabilization by moving the rear lens group G2R in the second lens group G2 as an image stabilization lens group so as to include a component in a direction orthogonal to the optical axis.
Table 2 below lists values of specifications of the zoom lens according to the present example.

(Table 2) Second Example
[Surface data]
Surface number r d nd νd
Object ∞

1 78.484 0.800 1.603 65.440
2 9.640 3.089
* 3 240.283 1.000 1.623 58.163
* 4 14.940 0.286
5 11.133 2.300 2.001 25.455
6 15.568 Variable

* 7 17.287 2.475 1.619 63.854
8 -11.064 0.800 1.648 33.723
9 -29.967 1.500
10 (Aperture S) ∞ 3.054
11 41.552 2.920 1.498 82.570
12 -7.477 0.800 1.583 46.422
13 -18.335 Variable

* 14 63.143 0.800 1.623 58.163
* 15 11.500 Variable

* 16 -29.401 2.900 1.583 59.460
* 17 -11.497 BF

Image plane ∞

[Aspherical data]
Surface number κ A4 A6 A8 A10
3 1.000E + 00 4.841E-06 3.023E-06 -1.926E-08 0.000E + 00
4 1.000E + 00 -3.973E-06 3.373E-06 -2.350E-09 -2.653E-10
7 1.000E + 00 -7.145E-05 -2.026E-07 1.193E-08 1.831E-10
14 1.000E + 00 5.024E-04 -1.733E-05 4.606E-07 -1.011E-08
15 1.000E + 00 7.291E-04 -1.452E-05 1.487E-07 0.000E + 00
16 1.000E + 00 1.438E-04 1.228E-06 -4.055E-08 1.768E-10
17 1.000E + 00 1.467E-04 1.368E-06 -2.735E-08 5.125E-11

[Various data]
Scaling ratio 2.83

W T
f 10.3 29.1
FNO 3.56 5.66
2ω 77.0 ° 31.4 °
Y 8.19 8.19

(When focusing on an object at infinity)
W M T
f 10.300 18.720 29.100
d6 18.251 7.166 2.405
d13 1.600 6.619 12.046
d15 5.176 7.408 10.576
BF 13.299 13.299 13.299
TL 47.750 43.916 47.750

(When focusing on a short distance object)
W M T
D 200.000 200.000 200.000
d6 18.251 7.166 2.405
d13 2.100 8.132 15.490
d15 4.676 5.895 7.133
BF 13.299 13.299 13.299
TL 47.750 43.916 47.750

[Lens group data]
Group start surface f
1 1 -14.400
2 7 13.831
3 14 -22.718
4 16 30.553

[Anti-vibration data]
W M T
f 10.300 18.720 29.100
Z 0.168 0.174 0.198
θ 0.624 0.500 0.500
K 0.668 0.941 1.281

[Conditional expression values]
(1) | f2i | /fw=3.042
(2) | f2i | /f2=2.265
(3) m12 / fw = 1.538

FIGS. 5A and 5B are graphs showing various aberrations during focusing on an object at infinity in the wide-angle end state and the telephoto end state of the zoom lens according to Example 2 of the present application, respectively.
6 (a) and 6 (b) respectively perform image stabilization for 0.624 ° rotation blur when focusing on an object at infinity in the wide-angle end state of the zoom lens according to Example 2 of the present application. FIG. 7 is a coma aberration diagram when the object is in focus, and a coma aberration diagram when the image stabilization is performed for a rotational shake of 0.500 ° when an object at infinity is focused in the telephoto end state.

  From each aberration diagram, the zoom lens according to the present example has high optical performance with various aberrations corrected well from the wide-angle end state to the telephoto end state, and also has high optical performance even during image stabilization. I understand that.

(Third embodiment)
FIGS. 7A and 7B are sectional views of the zoom lens according to the third example of the present application in the wide-angle end state and the telephoto end state, respectively.
The zoom lens according to the present embodiment includes a first lens group G1 having a negative refractive power, a second lens group G2 having a positive refractive power, a third lens group G3 having a negative refractive power, and a positive It is composed of a fourth lens group G4 having refractive power.

  The first lens group G1, in order from the object side, includes a negative meniscus lens L11 having a convex surface directed toward the object side, a negative meniscus lens L12 having a convex surface directed toward the object side, and a positive meniscus lens L13 having a convex surface directed toward the object side. Consists of. The negative meniscus lens L12 is a glass mold aspheric lens in which the object-side and image-side lens surfaces are aspherical.

The second lens group G2 includes, in order from the object side, a front lens group G2F having a positive refractive power, an aperture stop S, and a rear lens group G2R having a positive refractive power.
The front lens group G2F is composed of, in order from the object side, a biconvex positive lens L21 and a negative meniscus lens L22 with a concave surface facing the object side. The positive lens L21 is a glass mold aspheric lens having an aspheric lens surface on the object side.
The rear lens group G2R includes, in order from the object side, a cemented lens of a negative meniscus lens L23 having a convex surface facing the object side and a biconvex positive lens L24.

  The third lens group G3 includes a negative meniscus lens L31 having a convex surface directed toward the object side. The negative meniscus lens L31 is a glass mold aspheric lens in which the object-side and image-side lens surfaces are aspherical.

  The fourth lens group G4 includes a positive meniscus lens L41 having a convex surface directed toward the image side. The positive meniscus lens L41 is a glass mold aspheric lens in which the object-side and image-side lens surfaces are aspherical.

  With the above configuration, in the zoom lens according to the present embodiment, the air gap between the first lens group G1 and the second lens group G2 decreases during zooming from the wide-angle end state to the telephoto end state, and the second lens The first lens group G1 moves along the optical axis so that the air gap between the group G2 and the third lens group G3 increases and the air gap between the third lens group G3 and the fourth lens group G4 increases. The second lens group G2 and the third lens group G3 move toward the object side along the optical axis. The position of the fourth lens group G4 is fixed at the time of zooming. In addition, the front lens group G2F, the aperture stop S, and the rear lens group G2R of the second lens group G2 move together during zooming.

  In the zoom lens according to the present embodiment, the third lens group G3 is moved to the image side along the optical axis, thereby focusing from an object at infinity to a near object.

Further, the zoom lens according to the present embodiment performs image stabilization by moving the rear lens group G2R in the second lens group G2 as an image stabilization lens group so as to include a component in a direction orthogonal to the optical axis.
Table 3 below provides values of specifications of the zoom lens according to the present example.

(Table 3) Third Example
[Surface data]
Surface number r d nd νd
Object ∞

1 81.550 0.800 1.603 65.440
2 9.681 3.069
* 3 328.483 1.000 1.623 58.163
* 4 14.895 0.345
5 11.373 2.200 2.001 25.455
6 16.225 Variable

* 7 17.158 2.493 1.619 63.854
8 -13.864 0.157
9 -13.612 0.800 1.648 33.723
10 -40.184 1.500
11 (Aperture S) ∞ 2.911
12 17.888 0.800 1.583 46.422
13 6.850 3.050 1.498 82.570
14 -29.219 Variable

* 15 62.039 0.800 1.623 58.163
* 16 11.500 Variable

* 17 -26.508 2.900 1.583 59.460
* 18 -11.123 BF

Image plane ∞

[Aspherical data]
Surface number κ A4 A6 A8 A10
3 1.000E + 00 -1.154E-06 3.285E-06 -2.143E-08 0.000E + 00
4 1.000E + 00 -3.977E-06 3.056E-06 9.547E-09 -4.065E-10
7 1.000E + 00 -5.971E-05 -1.038E-06 6.985E-08 -1.544E-09
15 1.000E + 00 5.899E-04 -2.242E-05 3.797E-07 -1.428E-09
16 1.000E + 00 8.486E-04 -2.240E-05 2.918E-07 0.000E + 00
17 1.000E + 00 9.517E-05 3.227E-06 -6.273E-08 2.917E-10
18 1.000E + 00 9.730E-05 2.655E-06 -3.199E-08 6.854E-11

[Various data]
Scaling ratio 2.83

W T
f 10.3 29.1
FNO 3.56 5.66
2ω 77.0 ° 31.4 °
Y 8.19 8.19

(When focusing on an object at infinity)
W M T
f 10.300 18.663 29.100
d6 18.137 7.139 2.319
d14 1.600 6.535 12.018
d16 5.189 7.498 10.589
BF 13.299 13.299 13.299
TL 47.750 43.997 47.750

(When focusing on a short distance object)
W M T
D 200.000 200.000 200.000
d6 18.137 7.139 2.319
d14 2.100 8.032 15.454
d16 4.689 6.001 7.152
BF 13.299 13.299 13.299
TL 47.750 43.997 47.750

[Lens group data]
Group start surface f
1 1 -14.356
2 7 13.818
3 15 -22.812
4 17 30.732

[Anti-vibration data]
W M T
f 10.300 18.663 29.100
Z 0.139 0.146 0.168
θ 0.624 0.500 0.500
K 0.804 1.118 1.511

[Conditional expression values]
(1) | f2i | /fw=2.664
(2) | f2i | /f2=1.986
(3) m12 / fw = 1.536

FIGS. 8A and 8B are graphs showing various aberrations at the time of focusing on an object at infinity in the wide-angle end state and the telephoto end state of the zoom lens according to Example 3 of the present application, respectively.
FIG. 9A and FIG. 9B respectively perform image stabilization against 0.624 ° rotational blur when focusing on an object at infinity in the wide-angle end state of the zoom lens according to Example 3 of the present application. FIG. 7 is a coma aberration diagram when the object is in focus, and a coma aberration diagram when the image stabilization is performed for a rotational shake of 0.500 ° when an object at infinity is focused in the telephoto end state.

  From each aberration diagram, the zoom lens according to the present example has high optical performance with various aberrations corrected well from the wide-angle end state to the telephoto end state, and also has high optical performance even during image stabilization. I understand that.

(Fourth embodiment)
FIGS. 10A and 10B are sectional views of the zoom lens according to the fourth example of the present application in the wide-angle end state and the telephoto end state, respectively.
The zoom lens according to the present embodiment includes a first lens group G1 having a negative refractive power, a second lens group G2 having a positive refractive power, a third lens group G3 having a negative refractive power, and a positive It is composed of a fourth lens group G4 having refractive power.

  The first lens group G1, in order from the object side, includes a negative meniscus lens L11 having a convex surface directed toward the object side, a negative meniscus lens L12 having a convex surface directed toward the object side, and a positive meniscus lens L13 having a convex surface directed toward the object side. Consists of. The negative meniscus lens L12 is a glass mold aspheric lens in which the object-side and image-side lens surfaces are aspherical.

The second lens group G2 includes, in order from the object side, a front lens group G2F having a positive refractive power, an aperture stop S, and a rear lens group G2R having a positive refractive power.
The front lens group G2F is composed of a cemented lens of a negative meniscus lens L21 having a convex surface directed toward the object side and a biconvex positive lens L22 in order from the object side. The negative meniscus lens L21 is a glass mold aspheric lens having an aspheric lens surface on the object side.
The rear lens group G2R includes, in order from the object side, a cemented lens of a negative meniscus lens L23 having a convex surface facing the object side and a biconvex positive lens L24.

  The third lens group G3 includes a negative meniscus lens L31 having a convex surface directed toward the object side. The negative meniscus lens L31 is a glass mold aspheric lens in which the object-side and image-side lens surfaces are aspherical.

  The fourth lens group G4 includes a positive meniscus lens L41 having a convex surface directed toward the image side. The positive meniscus lens L41 is a glass mold aspheric lens in which the object-side and image-side lens surfaces are aspherical.

  With the above configuration, in the zoom lens according to the present embodiment, the air gap between the first lens group G1 and the second lens group G2 decreases during zooming from the wide-angle end state to the telephoto end state, and the second lens The first lens group G1 moves along the optical axis so that the air gap between the group G2 and the third lens group G3 increases and the air gap between the third lens group G3 and the fourth lens group G4 increases. The second lens group G2 and the third lens group G3 move toward the object side along the optical axis. The position of the fourth lens group G4 is fixed at the time of zooming. In addition, the front lens group G2F, the aperture stop S, and the rear lens group G2R of the second lens group G2 move together during zooming.

  In the zoom lens according to the present embodiment, the third lens group G3 is moved to the image side along the optical axis, thereby focusing from an object at infinity to a near object.

Further, the zoom lens according to the present embodiment performs image stabilization by moving the rear lens group G2R in the second lens group G2 as an image stabilization lens group so as to include a component in a direction orthogonal to the optical axis.
Table 4 below lists values of specifications of the zoom lens according to the present example.

(Table 4) Fourth Example
[Surface data]
Surface number r d nd νd
Object ∞

1 106.318 0.800 1.603 65.440
2 10.056 2.861
* 3 143.575 1.000 1.623 58.163
* 4 14.071 0.423
5 11.120 2.300 2.001 25.455
6 15.538 Variable

* 7 13.167 0.800 1.689 31.160
8 10.273 2.367 1.498 82.570
9 -30.189 1.500
10 (Aperture S) ∞ 2.779
11 18.410 0.800 1.583 46.422
12 7.012 3.193 1.498 82.570
13 -30.652 Variable

* 14 63.684 0.800 1.623 58.163
* 15 11.500 Variable

* 16 -27.536 2.900 1.583 59.460
* 17 -11.202 BF

Image plane ∞

[Aspherical data]
Surface number κ A4 A6 A8 A10
3 1.000E + 00 -8.371E-07 3.721E-06 -2.590E-08 0.000E + 00
4 1.000E + 00 -4.169E-06 3.663E-06 6.939E-09 -4.421E-10
7 1.000E + 00 -7.051E-05 -5.833E-07 3.934E-08 -8.656E-10
14 1.000E + 00 5.363E-04 -1.981E-05 3.911E-07 -5.635E-09
15 1.000E + 00 7.643E-04 -1.714E-05 1.457E-07 0.000E + 00
16 1.000E + 00 7.120E-05 3.106E-06 -5.397E-08 2.399E-10
17 1.000E + 00 9.425E-05 2.054E-06 -2.025E-08 1.922E-11

[Various data]
Scaling ratio 2.83

W T
f 10.3 29.1
FNO 3.56 5.66
2ω 77.0 ° 31.4 °
Y 8.19 8.19

(When focusing on an object at infinity)
W M T
f 10.300 18.719 29.100
d6 18.449 7.402 2.629
d13 1.600 6.578 12.020
d15 5.178 7.477 10.578
BF 13.299 13.299 13.299
TL 47.750 43.980 47.750

(When focusing on a short distance object)
W M T
D 200.000 200.000 200.000
d6 18.449 7.402 2.629
d13 2.100 8.086 15.463
d15 4.678 5.969 7.136
BF 13.299 13.299 13.299
TL 47.750 43.980 47.750

[Lens group data]
Group start surface f
1 1 -14.399
2 7 13.808
3 14 -22.674
4 16 30.395

[Anti-vibration data]
W M T
f 10.300 18.719 29.100
Z 0.145 0.152 0.175
θ 0.624 0.500 0.500
K 0.775 1.077 1.452

[Conditional expression values]
(1) | f2i | /fw=2.771
(2) | f2i | /f2=2.067
(3) m12 / fw = 1.536

FIGS. 11A and 11B are graphs showing various aberrations at the time of focusing on an object at infinity in the wide-angle end state and the telephoto end state of the zoom lens according to Example 4 of the present application, respectively.
12 (a) and 12 (b) respectively perform image stabilization against a rotation blur of 0.624 ° when focusing on an object at infinity at the wide-angle end state of the zoom lens according to Example 4 of the present application. FIG. 7 is a coma aberration diagram when the object is in focus, and a coma aberration diagram when the image stabilization is performed for a rotational shake of 0.500 ° when an object at infinity is focused in the telephoto end state.

  From each aberration diagram, the zoom lens according to the present example has high optical performance with various aberrations corrected well from the wide-angle end state to the telephoto end state, and also has high optical performance even during image stabilization. I understand that.

(5th Example)
FIGS. 13A and 13B are sectional views of the zoom lens according to the fifth example of the present application in the wide-angle end state and the telephoto end state, respectively.
The zoom lens according to the present embodiment includes a first lens group G1 having a negative refractive power, a second lens group G2 having a positive refractive power, a third lens group G3 having a negative refractive power, and a positive It is composed of a fourth lens group G4 having refractive power.

  The first lens group G1, in order from the object side, includes a negative meniscus lens L11 having a convex surface directed toward the object side, a negative meniscus lens L12 having a convex surface directed toward the object side, and a positive meniscus lens L13 having a convex surface directed toward the object side. Consists of. The negative meniscus lens L12 is a glass mold aspheric lens in which the object-side and image-side lens surfaces are aspherical.

The second lens group G2 includes, in order from the object side, a front lens group G2F having a positive refractive power, an aperture stop S, and a rear lens group G2R having a positive refractive power.
The front lens group G2F is composed of a cemented lens of a negative meniscus lens L21 having a convex surface directed toward the object side and a biconvex positive lens L22 in order from the object side. The negative meniscus lens L21 is a glass mold aspheric lens having an aspheric lens surface on the object side.
The rear lens group G2R includes, in order from the object side, a cemented lens of a biconvex positive lens L23 and a negative meniscus lens L24 having a concave surface facing the object side.

  The third lens group G3 includes a negative meniscus lens L31 having a convex surface directed toward the object side. The negative meniscus lens L31 is a glass mold aspheric lens in which the object-side and image-side lens surfaces are aspherical.

  The fourth lens group G4 includes a positive meniscus lens L41 having a convex surface directed toward the image side. The positive meniscus lens L41 is a glass mold aspheric lens in which the object-side and image-side lens surfaces are aspherical.

  With the above configuration, in the zoom lens according to the present embodiment, the air gap between the first lens group G1 and the second lens group G2 decreases during zooming from the wide-angle end state to the telephoto end state, and the second lens The first lens group G1 moves along the optical axis so that the air gap between the group G2 and the third lens group G3 increases and the air gap between the third lens group G3 and the fourth lens group G4 increases. The second lens group G2 and the third lens group G3 move toward the object side along the optical axis. The position of the fourth lens group G4 is fixed at the time of zooming. In addition, the front lens group G2F, the aperture stop S, and the rear lens group G2R of the second lens group G2 move together during zooming.

  In the zoom lens according to the present embodiment, the third lens group G3 is moved to the image side along the optical axis, thereby focusing from an object at infinity to a near object.

Further, the zoom lens according to the present embodiment performs image stabilization by moving the rear lens group G2R in the second lens group G2 as an image stabilization lens group so as to include a component in a direction orthogonal to the optical axis.
Table 5 below provides values of specifications of the zoom lens according to the present example.

(Table 5) Fifth Example
[Surface data]
Surface number r d nd νd
Object ∞

1 88.142 0.800 1.603 65.440
2 9.905 2.982
* 3 210.317 1.000 1.623 58.163
* 4 14.471 0.351
5 11.109 2.232 2.001 25.455
6 15.535 Variable

* 7 12.853 0.800 1.689 31.160
8 9.651 2.483 1.498 82.570
9 -25.272 1.500
10 (Aperture S) ∞ 2.982
11 38.663 2.959 1.498 82.570
12 -7.387 0.800 1.583 46.422
13 -18.053 Variable

* 14 62.590 0.800 1.623 58.163
* 15 11.500 Variable

* 16 -30.304 2.900 1.583 59.460
* 17 -11.634 BF

Image plane ∞

[Aspherical data]
Surface number κ A4 A6 A8 A10
3 1.000E + 00 5.701E-06 3.172E-06 -2.105E-08 0.000E + 00
4 1.000E + 00 -3.719E-06 3.592E-06 -2.523E-09 -2.835E-10
7 1.000E + 00 -8.356E-05 -4.804E-08 3.953E-08 -1.452E-09
14 1.000E + 00 5.370E-04 -1.971E-05 5.561E-07 -1.276E-08
15 1.000E + 00 7.313E-04 -1.349E-05 7.835E-08 0.000E + 00
16 1.000E + 00 9.440E-05 2.643E-06 -5.709E-08 2.373E-10
17 1.000E + 00 1.188E-04 1.670E-06 -2.423E-08 -1.067E-11

[Various data]
Scaling ratio 2.83

W T
f 10.3 29.1
FNO 3.56 5.66
2ω 77.0 ° 31.4 °
Y 8.19 8.19

(When focusing on an object at infinity)
W M T
f 10.300 18.707 29.100
d6 18.352 7.209 2.442
d13 1.600 6.675 12.110
d15 5.209 7.356 10.609
BF 13.299 13.299 13.298
TL 47.750 43.831 47.750

(When focusing on a short distance object)
W M T
D 200.000 200.000 200.000
d6 18.352 7.209 2.442
d13 2.100 8.191 15.553
d15 4.709 5.841 7.165
BF 13.299 13.299 13.298
TL 47.750 43.831 47.750

[Lens group data]
Group start surface f
1 1 -14.390
2 7 13.895
3 14 -22.764
4 16 30.631

[Anti-vibration data]
W M T
f 10.300 18.707 29.100
Z 0.161 0.167 0.190
θ 0.624 0.500 0.500
K 0.696 0.980 1.336

[Conditional expression values]
(1) | f2i | /fw=2.932
(2) | f2i | /f2=2.174
(3) m12 / fw = 1.545

FIGS. 14A and 14B are graphs showing various aberrations when the zoom lens according to Example 5 of the present application is focused on an object at infinity in the wide-angle end state and the telephoto end state, respectively.
FIGS. 15 (a) and 15 (b) respectively perform image stabilization against a rotational shake of 0.624 ° during focusing on an object at infinity in the wide-angle end state of the zoom lens according to Example 5 of the present application. FIG. 7 is a coma aberration diagram when the object is in focus, and a coma aberration diagram when the image stabilization is performed for a rotational shake of 0.500 ° when an object at infinity is focused in the telephoto end state.

  From each aberration diagram, the zoom lens according to the present example has high optical performance with various aberrations corrected well from the wide-angle end state to the telephoto end state, and also has high optical performance even during image stabilization. I understand that.

(Sixth embodiment)
FIGS. 16A and 16B are cross-sectional views of the zoom lens according to the sixth example of the present application in the wide-angle end state and the telephoto end state, respectively.
The zoom lens according to the present embodiment includes a first lens group G1 having a negative refractive power, a second lens group G2 having a positive refractive power, a third lens group G3 having a negative refractive power, and a positive It is composed of a fourth lens group G4 having refractive power.

  The first lens group G1, in order from the object side, includes a negative meniscus lens L11 having a convex surface directed toward the object side, a negative meniscus lens L12 having a convex surface directed toward the object side, and a positive meniscus lens L13 having a convex surface directed toward the object side. Consists of. The negative meniscus lens L12 is a glass mold aspheric lens in which the object-side and image-side lens surfaces are aspherical.

The second lens group G2 includes, in order from the object side, a front lens group G2F having a positive refractive power, an aperture stop S, and a rear lens group G2R having a positive refractive power.
The front lens group G2F includes, in order from the object side, a cemented lens of a biconvex positive lens L21 and a negative meniscus lens L22 having a concave surface facing the object side. The positive lens L21 is a glass mold aspheric lens having an aspheric lens surface on the object side.
The rear lens group G2R includes, in order from the object side, a cemented lens of a negative meniscus lens L23 having a convex surface facing the object side and a biconvex positive lens L24, and a biconvex positive lens L25.

  The third lens group G3 includes a negative meniscus lens L31 having a convex surface directed toward the object side. The negative meniscus lens L31 is a glass mold aspheric lens in which the object-side and image-side lens surfaces are aspherical.

  The fourth lens group G4 includes a positive meniscus lens L41 having a convex surface directed toward the image side. The positive meniscus lens L41 is a glass mold aspheric lens in which the object-side and image-side lens surfaces are aspherical.

  With the above configuration, in the zoom lens according to the present embodiment, the air gap between the first lens group G1 and the second lens group G2 decreases during zooming from the wide-angle end state to the telephoto end state, and the second lens The first lens group G1 moves along the optical axis so that the air gap between the group G2 and the third lens group G3 increases and the air gap between the third lens group G3 and the fourth lens group G4 increases. The second lens group G2 and the third lens group G3 move toward the object side along the optical axis. The position of the fourth lens group G4 is fixed at the time of zooming. In addition, the front lens group G2F, the aperture stop S, and the rear lens group G2R of the second lens group G2 move together during zooming.

  In the zoom lens according to the present embodiment, the third lens group G3 is moved to the image side along the optical axis, thereby focusing from an object at infinity to a near object.

In the zoom lens according to the present embodiment, the cemented lens of the negative meniscus lens L23 and the positive lens L24 in the rear lens group G2R is moved as a vibration-proof lens group so as to include a component in a direction orthogonal to the optical axis. To prevent vibration.
Table 6 below provides values of specifications of the zoom lens according to the present example.

(Table 6) Sixth Example
[Surface data]
Surface number r d nd νd
Object ∞

1 45.595 0.800 1.603 65.440
2 9.305 3.897
* 3 105.000 1.000 1.623 58.163
* 4 14.940 0.100
5 12.251 2.300 2.001 25.455
6 17.488 Variable

* 7 17.546 2.764 1.623 58.163
8 -11.264 0.800 1.603 38.028
9 -98.822 1.500
10 (Aperture S) ∞ 1.387
11 19.920 0.800 1.583 46.422
12 7.418 2.957 1.498 82.570
13 -30.797 0.418
14 69.148 1.200 1.498 82.570
15 -235.478 Variable

* 16 84.505 0.800 1.623 58.163
* 17 11.200 Variable

* 18 -48.331 2.762 1.583 59.460
* 19 -13.370 BF

Image plane ∞

[Aspherical data]
Surface number κ A4 A6 A8 A10
3 1.000E + 00 -1.989E-04 4.989E-06 -2.793E-08 0.000E + 00
4 1.000E + 00 -2.392E-04 5.104E-06 -1.433E-08 -2.533E-10
7 1.000E + 00 -6.515E-05 -2.091E-07 -5.039E-09 5.126E-10
16 1.000E + 00 2.128E-04 3.675E-06 -3.902E-07 6.158E-09
17 1.000E + 00 3.722E-04 1.473E-06 -2.115E-07 0.000E + 00
18 1.000E + 00 2.156E-05 2.295E-06 -5.042E-08 2.351E-10
19 1.000E + 00 5.297E-05 1.731E-06 -3.031E-08 5.877E-11

[Various data]
Scaling ratio 2.83

W T
f 10.3 29.1
FNO 3.56 5.66
2ω 77.0 ° 31.4 °
Y 8.19 8.19

(When focusing on an object at infinity)
W M T
f 10.300 20.160 29.100
d6 19.196 6.353 2.334
d15 1.600 6.308 9.827
d17 4.618 8.326 12.191
BF 13.300 13.297 13.299
TL 48.900 44.472 47.837

(When focusing on a short distance object)
W M T
D 200.000 200.000 200.000
d6 19.196 6.353 2.334
d15 2.058 7.811 12.661
d17 4.161 6.823 9.357
BF 13.300 13.296 13.299
TL 48.900 44.472 47.837

[Lens group data]
Group start surface f
1 1 -15.508
2 7 13.604
3 16 -20.824
4 18 30.800

[Anti-vibration data]
W M T
f 10.300 20.160 29.100
Z 0.145 0.162 0.184
θ 0.624 0.500 0.500
K 0.771 1.089 1.383

[Conditional expression values]
(1) | f2i | /fw=2.313
(2) | f2i | /f2=1.751
(3) m12 / fw = 1.637

FIGS. 17A and 17B are graphs showing various aberrations when the zoom lens according to Example 6 of the present application is focused on an object at infinity in the wide-angle end state and the telephoto end state, respectively.
18 (a) and 18 (b) respectively perform image stabilization against a rotation blur of 0.624 ° when focusing on an object at infinity in the wide-angle end state of the zoom lens according to Example 6 of the present application. FIG. 7 is a coma aberration diagram when the object is in focus, and a coma aberration diagram when the image stabilization is performed for a rotational shake of 0.500 ° when an object at infinity is focused in the telephoto end state.

  From each aberration diagram, the zoom lens according to the present example has high optical performance with various aberrations corrected well from the wide-angle end state to the telephoto end state, and also has high optical performance even during image stabilization. I understand that.

(Seventh embodiment)
FIGS. 19A and 19B are cross-sectional views of the zoom lens according to the seventh example of the present application in the wide-angle end state and the telephoto end state, respectively.
The zoom lens according to the present embodiment includes a first lens group G1 having a negative refractive power, a second lens group G2 having a positive refractive power, a third lens group G3 having a negative refractive power, and a positive It is composed of a fourth lens group G4 having refractive power.

  The first lens group G1, in order from the object side, includes a negative meniscus lens L11 having a convex surface directed toward the object side, a negative meniscus lens L12 having a convex surface directed toward the object side, and a positive meniscus lens L13 having a convex surface directed toward the object side. Consists of. The negative meniscus lens L12 is a glass mold aspheric lens in which the object-side and image-side lens surfaces are aspherical.

The second lens group G2 includes, in order from the object side, a front lens group G2F having a positive refractive power, an aperture stop S, and a rear lens group G2R having a positive refractive power.
The front lens group G2F includes, in order from the object side, a cemented lens of a biconvex positive lens L21 and a negative meniscus lens L22 having a concave surface facing the object side. The positive lens L21 is a glass mold aspheric lens having an aspheric lens surface on the object side.
The rear lens group G2R includes, in order from the object side, a cemented lens of a negative meniscus lens L23 having a convex surface facing the object side and a biconvex positive lens L24.

  The third lens group G3 includes a negative meniscus lens L31 having a convex surface directed toward the object side.

  The fourth lens group G4 includes, in order from the object side, a positive meniscus lens L41 having a convex surface directed toward the image side, and a biconvex positive lens L42. The positive meniscus lens L41 and the positive lens L42 are glass mold aspherical lenses in which the object-side and image-side lens surfaces are aspherical, respectively.

  With the above configuration, in the zoom lens according to the present embodiment, the air gap between the first lens group G1 and the second lens group G2 decreases during zooming from the wide-angle end state to the telephoto end state, and the second lens The first lens group G1 moves along the optical axis so that the air gap between the group G2 and the third lens group G3 increases and the air gap between the third lens group G3 and the fourth lens group G4 increases. The second lens group G2 and the third lens group G3 move toward the object side along the optical axis. The position of the fourth lens group G4 is fixed at the time of zooming. In addition, the front lens group G2F, the aperture stop S, and the rear lens group G2R of the second lens group G2 move together during zooming.

  In the zoom lens according to the present embodiment, the third lens group G3 is moved to the image side along the optical axis, thereby focusing from an object at infinity to a near object.

Further, the zoom lens according to the present embodiment performs image stabilization by moving the rear lens group G2R in the second lens group G2 as an image stabilization lens group so as to include a component in a direction orthogonal to the optical axis.
Table 7 below lists values of specifications of the zoom lens according to the present example.

(Table 7) Seventh Example
[Surface data]
Surface number r d nd νd
Object ∞

1 49.983 0.800 1.603 65.440
2 9.505 3.797
* 3 105.000 1.000 1.623 58.163
* 4 15.558 0.100
5 12.387 2.300 2.001 25.455
6 17.350 Variable

* 7 17.524 2.569 1.623 58.163
8 -10.281 0.800 1.603 38.028
9 -57.158 1.500
10 (Aperture S) ∞ 2.772
11 18.079 0.800 1.583 46.422
12 6.987 3.000 1.498 82.570
13 -30.422 Variable

14 67.175 0.800 1.623 58.163
15 11.200 Variable

* 16 -36.612 2.616 1.583 59.460
* 17 -12.977 0.300
* 18 1000.000 1.115 1.583 59.460
* 19 -210.703 BF

Image plane ∞

[Aspherical data]
Surface number κ A4 A6 A8 A10
3 1.000E + 00 -1.815E-04 4.949E-06 -2.802E-08 0.000E + 00
4 1.000E + 00 -2.152E-04 4.869E-06 -9.757E-09 -2.834E-10
7 1.000E + 00 -5.840E-05 -1.272E-06 8.962E-08 -2.229E-09
16 1.000E + 00 2.682E-06 4.729E-06 -1.432E-07 1.899E-09
17 1.000E + 00 1.508E-04 2.729E-06 -7.215E-08 0.000E + 00
18 1.000E + 00 7.330E-05 1.194E-06 -2.778E-08 2.807E-11
19 1.000E + 00 7.834E-05 1.005E-06 -1.240E-08 -1.054E-10

[Various data]
Scaling ratio 2.83

W T
f 10.3 29.1
FNO 3.56 5.66
2ω 77.0 ° 31.4 °
Y 8.19 8.19

(When focusing on an object at infinity)
W M T
f 10.300 20.356 29.100
d6 19.255 6.343 2.342
d13 1.600 6.867 10.960
d15 3.777 7.568 10.723
BF 13.299 13.299 13.299
TL 48.900 45.046 48.293

(When focusing on a short distance object)
W M T
D 200.000 200.000 200.000
d6 19.255 6.343 2.342
d13 2.102 8.572 14.245
d15 3.275 5.863 7.438
BF 13.299 13.299 13.299
TL 48.900 45.046 48.293

[Lens group data]
Group start surface f
1 1 -15.658
2 7 14.031
3 14 -21.707
4 16 29.815

[Anti-vibration data]
W M T
f 10.300 20.356 29.100
Z 0.144 0.157 0.176
θ 0.624 0.500 0.500
K 0.779 1.134 1.441

[Conditional expression values]
(1) | f2i | /fw=2.718
(2) | f2i | /f2=1.996
(3) m12 / fw = 1.642

FIGS. 20A and 20B are graphs showing various aberrations when the zoom lens according to the seventh example of the present application is focused on an object at infinity in the wide-angle end state and the telephoto end state, respectively.
FIG. 21A and FIG. 21B respectively perform image stabilization against a rotational shake of 0.624 ° during focusing on an object at infinity in the wide-angle end state of the zoom lens according to Example 7 of the present application. FIG. 7 is a coma aberration diagram when the object is in focus, and a coma aberration diagram when the image stabilization is performed for a rotational shake of 0.500 ° when an object at infinity is focused in the telephoto end state.

  From each aberration diagram, the zoom lens according to the present example has high optical performance with various aberrations corrected well from the wide-angle end state to the telephoto end state, and also has high optical performance even during image stabilization. I understand that.

  According to each of the above embodiments, it is possible to realize a zoom lens having a short overall length, a small size and a light weight, excellently correcting chromatic aberration both in the case of anti-vibration and in the case of non-vibration and having high optical performance. In addition, each said Example has shown one specific example of this invention, and this invention is not limited to these. The following contents can be appropriately adopted within a range that does not impair the optical performance of the zoom lens of the present application.

  Although a numerical example of the zoom lens of the present application has been described with a four-group configuration, the present application is not limited to this, and a zoom lens of another group configuration (for example, five groups) can also be configured. Specifically, a configuration in which a lens or a lens group is added to the most object side or the most image side of the zoom lens of the present application may be used.

  In addition, the zoom lens of the present application is used in order to focus from an object at infinity to an object at a short distance in the direction of the optical axis using a part of the lens group, the entire lens group, or a plurality of lens groups as the focusing lens group. It is good also as a structure moved to. In particular, it is preferable that at least a part of the third lens group is a focusing lens group. Such a focusing lens group can be applied to autofocus, and is also suitable for driving by an autofocus motor such as an ultrasonic motor.

  In the zoom lens of the present application, either the entire lens group or a part of the lens group is moved so as to include a component in a direction perpendicular to the optical axis as an anti-vibration lens group, or an in-plane direction including the optical axis It can also be set as the structure which carries out anti-vibration by carrying out rotational movement (oscillation) to (F). In particular, in the zoom lens of the present application, it is preferable that at least a part of the second lens group is an anti-vibration lens group.

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

In the zoom lens of the present application, it is preferable that the aperture stop be disposed in the second lens group, and the role may be substituted by a lens frame without providing a member as the aperture stop.
Further, an antireflection film having a high transmittance in a wide wavelength range may be provided on the lens surface of the lens constituting the zoom lens of the present application. Thereby, flare and ghost can be reduced, and high optical performance with high contrast can be achieved.

Next, a camera equipped with the zoom lens of the present application will be described with reference to FIG.
FIG. 22 is a diagram illustrating a configuration of a camera including the zoom lens of the present application.
As shown in FIG. 22, the camera 1 is a so-called mirrorless camera with interchangeable lenses provided with the zoom lens according to the first embodiment as the photographing lens 2.

In the camera 1, light from an object (subject) (not shown) is collected by the photographing lens 2 and is on the imaging surface of the imaging unit 3 via an OLPF (Optical low pass filter) (not shown). A subject image is formed on the screen. Then, the subject image is photoelectrically converted by the photoelectric conversion element provided in the imaging unit 3 to generate an image of the subject. This image is displayed on an EVF (Electronic view finder) 4 provided in the camera 1. Thus, the photographer can observe the subject via the EVF 4.
When the release button (not shown) is pressed by the photographer, the subject image generated by the imaging unit 3 is stored in a memory (not shown). In this way, the photographer can shoot the subject with the camera 1.

  Here, the zoom lens according to the first embodiment mounted as the photographic lens 2 in the camera 1 is a zoom lens having excellent optical performance, which corrects chromatic aberration well both in the case of anti-vibration and in the case of non-vibration. It is. Therefore, the camera 1 can satisfactorily correct chromatic aberration both at the time of anti-vibration and at the time of non-vibration and realize high optical performance. Even if the camera having the zoom lens according to the second to seventh embodiments mounted as the photographing lens 2, the same effect as the camera 1 can be obtained. Further, even when the zoom lens according to each of the above embodiments is mounted on a single-lens reflex camera having a quick return mirror and observing a subject with a finder optical system, the same effect as the camera 1 can be obtained.

Finally, the outline of the manufacturing method of the zoom lens of this application is demonstrated based on FIG.
The zoom lens manufacturing method shown in FIG. 23 includes, in order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens having a negative refractive power. A zoom lens manufacturing method having a lens group and a fourth lens group having a positive refractive power, and includes the following steps S1 to S4.

Step S1: The second lens group includes, in order from the object side, a front lens group, an aperture stop, and a rear lens group.
Step S2: The front lens group and the rear lens group each have at least one negative lens, and the first to fourth lens groups are sequentially arranged in the lens barrel from the object side.

Step S3: By providing a known moving mechanism in the lens barrel, the distance between the first lens group and the second lens group, the second lens group and the first lens group at the time of zooming from the wide-angle end state to the telephoto end state. The distance between the three lens groups and the distance between the third lens group and the fourth lens group are changed.
Step S4: By providing a known moving mechanism in the lens barrel, at least a part of the lenses in the rear lens group is moved so as to include a component in a direction orthogonal to the optical axis.

  According to the zoom lens manufacturing method of the present application, it is possible to correct the chromatic aberration well both in the case of anti-vibration and in the case of non-vibration, and to manufacture the zoom lens having high optical performance.

G1 First lens group G2 Second lens group G2F Front lens group G2R Rear lens group G3 Third lens group G4 Fourth lens group S Aperture stop I Image surface

Claims (10)

In order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, and a fourth lens having a positive refractive power A group,
At the time of zooming from the wide-angle end state to the telephoto end state, the distance between the first lens group and the second lens group, the distance between the second lens group and the third lens group, and the third lens group The distance from the fourth lens group changes,
The second lens group includes, in order from the object side, a front lens group, an aperture stop, and a rear lens group.
The front lens group and the rear lens group each have at least one negative lens;
A zoom lens, wherein at least a part of the lenses in the rear lens group moves so as to include a component in a direction orthogonal to the optical axis.   The zoom lens according to claim 1, wherein the front lens group has a positive refractive power.   The zoom lens according to claim 1, wherein the rear lens group has a positive refractive power. The zoom lens according to any one of claims 1 to 3, wherein the following conditional expression is satisfied.
1.00 <| f2i | / fw <4.00
However,
f2i: focal length of the rear lens group fw: focal length of the zoom lens in the wide-angle end state The zoom lens according to any one of claims 1 to 4, wherein the following conditional expression is satisfied.
0.50 <| f2i | / f2 <5.00
However,
f2i: focal length of the rear lens group f2: focal length of the second lens group The zoom lens according to any one of claims 1 to 5, wherein the following conditional expression is satisfied.
1.00 <m12 / fw <2.00
However,
m12: Amount of change fw from the wide-angle end state to the telephoto end state of the distance on the optical axis from the most image side lens surface in the first lens group to the most object side lens surface in the second lens group: The focal length of the zoom lens in the wide-angle end state   At the time of zooming from the wide-angle end state to the telephoto end state, the first lens group, the second lens group, and the third lens move along the optical axis, and the position of the fourth lens group is fixed. The zoom lens according to any one of claims 1 to 6, wherein:   The zoom lens according to any one of claims 1 to 7, wherein the front lens group includes at least two lenses and has at least one aspherical surface.   An optical apparatus comprising the zoom lens according to any one of claims 1 to 8. In order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, and a fourth lens having a positive refractive power A zoom lens manufacturing method comprising:
The second lens group includes, in order from the object side, a front lens group, an aperture stop, and a rear lens group.
The front lens group and the rear lens group each have at least one negative lens;
At the time of zooming from the wide-angle end state to the telephoto end state, the distance between the first lens group and the second lens group, the distance between the second lens group and the third lens group, and the third lens group The distance from the fourth lens group is changed,
A method of manufacturing a zoom lens, characterized in that at least a part of the lenses in the rear lens group moves so as to include a component in a direction orthogonal to the optical axis.

Images