Variable magnification optical system, optical apparatus, and method for manufacturing variable magnification optical system

Abstract

Provided is a variable magnification optical system, an optical apparatus, and a manufacturing method for a variable magnification optical system, which can achieve miniaturization and lightness while having high optical performance. A variable magnification optical system (GL) for an optical apparatus such as a camera (1) includes: a first lens group (G1) disposed on the most object side and having a positive refractive power; a second lens group (G2); and a rear group (GL), the interval between each lens group changing when magnification is changed, the first lens group (G1) having a positive lens (L11) on the most object side, the variable magnification optical system (GL) satisfying the following condition: 0.30 < D1MAX / G1d < 0.70, where D1MAX is the maximum air interval on the optical axis in the first lens group (G1), and G1d is the thickness on the optical axis of the first lens group (G1).

Description

Technical Field

[0001] This invention relates to a zoom optical system, an optical device, and a method for manufacturing a zoom optical system. Background Technology

[0002] In recent years, there has been a demand for miniaturization and weight reduction in telephoto zoom optical systems (see Patent Document 1). However, the optical system described in Patent Document 1 is required to further improve its optical performance.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2016-080824 Summary of the Invention

[0006] The zoom optical system of the first aspect of the present invention comprises: a first lens group disposed on the object-side and having positive optical power; a second lens group; and a rear group, wherein the spacing between the lens groups changes during zooming, and the first lens group has a positive lens on the object-side. The zoom optical system satisfies the following condition:

[0007] 0.30 <D1MAX / G1d<0.70

[0008] in,

[0009] D1MAX: The maximum air gap on the optical axis within the first lens group.

[0010] G1d: The thickness on the optical axis of the first lens group.

[0011] Furthermore, the zoom optical system of the second aspect of the present invention comprises: a first lens group disposed on the side closest to the object and having a positive optical power; a second lens group; and a rear group, wherein the spacing between the lens groups changes during zooming, and the first lens group has a positive lens on the side closest to the object. The zoom optical system satisfies the following condition:

[0012] 0.064 <D1MAX / f1<0.140

[0013] in,

[0014] D1MAX: The maximum air gap on the optical axis within the first lens group.

[0015] f1: Focal length of the first lens group.

[0016] A method for manufacturing a zoom optical system according to a first aspect of the present invention, the zoom optical system comprising: a first lens group disposed on the object-side and having positive optical power; a second lens group; and a rear group, wherein the zoom optical system is configured such that the spacing between the lens groups changes during zooming, a positive lens is disposed on the object-side of the first lens group, and the zoom optical system is configured to satisfy the following condition:

[0017] 0.30 <D1MAX / G1d<0.70

[0018] in,

[0019] D1MAX: The maximum air gap on the optical axis within the first lens group.

[0020] G1d: The thickness on the optical axis of the first lens group. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view showing the lens structure in the infinity focusing state at the wide-angle end of the zoom optical system of the first embodiment.

[0022] Figure 2 These are aberration diagrams of the zoom optical system of the first embodiment at infinity focus, (a) showing the wide-angle end state and (b) showing the telephoto end state.

[0023] Figure 3 This is a cross-sectional view showing the lens structure in the infinity focusing state at the wide-angle end of the zoom optical system of the second embodiment.

[0024] Figure 4 These are aberration diagrams of the zoom optical system in the infinity focusing state of the second embodiment. (a) shows the wide-angle state, and (b) shows the telephoto state.

[0025] Figure 5 This is a cross-sectional view showing the lens structure in the infinity focusing state at the wide-angle end of the zoom optical system of the third embodiment.

[0026] Figure 6 These are aberration diagrams of the zoom optical system in the infinity focusing state of the third embodiment, (a) showing the wide-angle end state and (b) showing the telephoto end state.

[0027] Figure 7 This is a cross-sectional view showing the lens structure in the infinity focusing state at the wide-angle end of the zoom optical system of the fourth embodiment.

[0028] Figure 8 These are aberration diagrams of the zoom optical system in the infinity focusing state of the fourth embodiment, (a) showing the wide-angle end state and (b) showing the telephoto end state.

[0029] Figure 9 This is a cross-sectional view of the lens structure in the infinity focusing state at the wide-angle end of the zoom optical system of the fifth embodiment.

[0030] Figure 10 These are aberration diagrams of the zoom optical system in the infinity focusing state of the fifth embodiment, (a) showing the wide-angle end state and (b) showing the telephoto end state.

[0031] Figure 11 This is a cross-sectional view showing the lens structure in the infinity focusing state at the wide-angle end of the zoom optical system of the sixth embodiment.

[0032] Figure 12 These are aberration diagrams of the zoom optical system in the infinity focusing state of the sixth embodiment, (a) showing the wide-angle end state and (b) showing the telephoto end state.

[0033] Figure 13 This is a cross-sectional view showing the lens structure in the infinity focusing state at the wide-angle end of the zoom optical system of the 7th embodiment.

[0034] Figure 14 These are aberration diagrams of the zoom optical system in the infinity focusing state of the seventh embodiment, (a) showing the wide-angle end state and (b) showing the telephoto end state.

[0035] Figure 15 This is a cross-sectional view showing the lens structure in the infinity focusing state at the wide-angle end of the zoom optical system of the 8th embodiment.

[0036] Figure 16 These are aberration diagrams of the zoom optical system in the infinite focusing state of the eighth embodiment, (a) showing the wide-angle end state and (b) showing the telephoto end state.

[0037] Figure 17 This is a cross-sectional view of a camera equipped with the aforementioned zoom optical system.

[0038] Figure 18 This is a flowchart illustrating the manufacturing method of the aforementioned zoom optical system. Detailed Implementation

[0039] Hereinafter, preferred embodiments will be described with reference to the accompanying drawings.

[0040] (First Embodiment)

[0041] like Figure 1As shown, the zoom optical system ZL of the first embodiment includes a first lens group G1, a second lens group G2, and a rear lens group GL, all with positive optical power, disposed on the object-side. The spacing between the lens groups changes during zooming. Furthermore, in this zoom optical system ZL, the first lens group G1 has a positive lens on the object-side (e.g., in…). Figure 1 In the example, it is a biconvex positive lens L11. By constructing it as described above, optical performance can be ensured, and the zoom optical system ZL can be miniaturized and made lighter.

[0042] Furthermore, the zoom optical system ZL of the first embodiment preferably satisfies the following conditional expression (1).

[0043] 0.30 <D1MAX / G1d<0.70 (1)

[0044] in,

[0045] D1MAX: The maximum air gap on the optical axis within the first lens group G1.

[0046] G1d: Thickness on the optical axis of lens group G1 (first lens group)

[0047] Condition (1) specifies the ratio of the maximum air gap within the first lens group G1 to the thickness along the optical axis of the first lens group G1. When the upper limit of condition (1) is exceeded, the thickness along the optical axis of the first lens group G1 becomes too thick, making it difficult to correct spherical aberration, axial chromatic aberration, magnification chromatic aberration, etc., which is undesirable. Furthermore, to reliably obtain the effect of condition (1), it is more preferable to set the upper limit of condition (1) to 0.68, 0.65, 0.63, 0.60, 0.58, and further to 0.55. In addition, when the value is lower than the lower limit of condition (1), it is not conducive to miniaturization and weight reduction. When miniaturization and weight reduction are desired, it is difficult to correct spherical aberration, coma, image plane curvature, etc., which is undesirable. Furthermore, to reliably obtain the effect of condition (1), it is more preferable to set the lower limit of condition (1) to 0.33, and further to 0.35.

[0048] Furthermore, the zoom optical system ZL in the first embodiment preferably satisfies the following conditional expression (2).

[0049] 0.064 <D1MAX / f1<0.140 (2)

[0050] in,

[0051] D1MAX: The maximum air gap on the optical axis within the first lens group G1.

[0052] f1: Focal length of the first lens group G1

[0053] Condition (2) specifies the ratio of the maximum air gap within the first lens group G1 to the focal length of the first lens group G1. When the value exceeds the upper limit of condition (2), the thickness along the optical axis of the first lens group G1 becomes excessive, making it difficult to correct spherical aberration, axial chromatic aberration, magnification chromatic aberration, etc., which is undesirable. Furthermore, to reliably obtain the effect of condition (2), it is more preferable to set the upper limit of condition (2) to 0.138, 0.135, 0.133, and further to 0.130. In addition, when the value is lower than the lower limit of condition (2), it is not conducive to miniaturization and weight reduction, and it is difficult to correct spherical aberration, coma, image plane curvature, etc. when miniaturization and weight reduction are desired, which is undesirable. Furthermore, to reliably obtain the effect of condition (2), it is more preferable to set the lower limit of condition (2) to 0.065, 0.068, and further to 0.070.

[0054] (Second Implementation)

[0055] like Figure 1 As shown, the zoom optical system ZL of the second embodiment includes a first lens group G1, a second lens group G2, and a rear lens group GL, all with positive optical power, disposed on the object-side. During zooming, the spacing between each lens group changes. Furthermore, in this zoom optical system ZL, the first lens group G1 has a positive lens on the object-side (e.g., in…). Figure 1 In the example, it is a biconvex positive lens L11). By constructing it as described above, the zoom optical system ZL can be miniaturized and made lighter.

[0056] Furthermore, the zoom optical system ZL in the second embodiment preferably satisfies the following conditional expression (2).

[0057] 0.064 <D1MAX / f1<0.140 (2)

[0058] in,

[0059] D1MAX: The maximum air gap on the optical axis within the first lens group G1.

[0060] f1: Focal length of the first lens group G1

[0061] Condition (2) specifies the ratio of the maximum air gap within the first lens group G1 to the focal length of the first lens group G1. When the value exceeds the upper limit of condition (2), the thickness along the optical axis of the first lens group G1 becomes excessive, making it difficult to correct spherical aberration, axial chromatic aberration, magnification chromatic aberration, etc., which is undesirable. Furthermore, to reliably obtain the effect of condition (2), it is more preferable to set the upper limit of condition (2) to 0.138, 0.135, 0.133, and further to 0.130. In addition, when the value is lower than the lower limit of condition (2), it is not conducive to miniaturization and weight reduction, and it is difficult to correct spherical aberration, coma, image plane curvature, etc. when miniaturization and weight reduction are desired, which is undesirable. Furthermore, to reliably obtain the effect of condition (2), it is more preferable to set the lower limit of condition (2) to 0.065, 0.068, and further to 0.070.

[0062] (Regarding the first and second embodiments)

[0063] Furthermore, the zoom optical system ZL of the first embodiment and the second embodiment (hereinafter referred to as "this embodiment") preferably satisfies the following condition (3).

[0064] 0.20 <f1 / ft<0.50 (3)

[0065] in,

[0066] f1: Focal length of the first lens group G1

[0067] ft: The focal length of the entire system at the telephoto end of the zoom optical system ZL.

[0068] Condition (3) specifies the ratio of the focal length of the first lens group G1 to the focal length of the entire system in the telephoto state. By satisfying the range of condition (3), variations in various aberrations such as spherical aberration, plane curvature, and coma during zoom can be effectively corrected. However, when the range of condition (3) is exceeded, variations in aberrations such as spherical aberration, plane curvature, and coma during zoom become larger, which is undesirable. Furthermore, to reliably obtain the effect of condition (3), it is more preferable to set the upper limit of condition (3) to 0.48, 0.46, 0.45, and more preferably 0.44. Furthermore, to reliably obtain the effect of condition (3), it is more preferable to set the lower limit of condition (3) to 0.23, 0.25, 0.28, and more preferably 0.30.

[0069] Furthermore, in this embodiment of the zoom optical system ZL, it is preferable that an aperture (e.g., ) is provided within the rear group GL. Figure 1The aperture stop S shown is a stabilization group Gv located on the image plane side of the aperture, which moves in a manner having a component in a direction orthogonal to the optical axis.

[0070] Furthermore, the zoom optical system ZL in this embodiment preferably satisfies the following conditional expression (4).

[0071] 1.50 < (1-βtv) × βtvb < 3.00 (4)

[0072] in,

[0073] βtv: Horizontal magnification of the image stabilization group Gv at the telephoto end.

[0074] βtvb: Horizontal magnification of the group located on the image plane side compared to the image stabilization group Gv at the telephoto end.

[0075] Condition (4) specifies the conditions for image stabilization using the image stabilization group Gv. By satisfying condition (4), variations in coma, plane curvature, astigmatism, and other aberrations during image stabilization can be effectively corrected. However, when the condition deviates from the range of condition (4), it becomes difficult to correct the aberrations under normal conditions, and it is difficult to balance the correction of coma, plane curvature, astigmatism, etc., during image stabilization, which is therefore undesirable. Furthermore, to reliably obtain the effect of condition (4), it is more preferable to set the upper limit of condition (4) to 2.90, 2.80, 2.70, 2.60, and further to 2.50. Furthermore, to more reliably obtain the effect of condition (4), it is more preferable to set the lower limit of condition (4) to 1.60, 1.70, 1.80, 1.90, 2.00, 2.10, and further to 2.20.

[0076] Furthermore, in the zoom optical system ZL of this embodiment, it is preferable that the image stabilization group Gv includes a positive lens, a positive lens, and a negative lens sequentially from the object side. With this configuration as described above, variations in aberrations such as coma during image stabilization can be corrected.

[0077] Furthermore, the zoom optical system ZL in this embodiment preferably satisfies the following conditional expression (5).

[0078] 0.020 <Gvd / TLt<0.040 (5)

[0079] in,

[0080] Gvd: Thickness on the optical axis of the image stabilization group Gv

[0081] TLt: Total optical length of the zoom optical system ZL at its telephoto end.

[0082] Condition (5) specifies the ratio of the thickness on the optical axis of the image stabilization group to the total optical length of the zoom optical system ZL in the telephoto state. By satisfying condition (5), variations in coma, astigmatism, and other aberrations during image stabilization can be effectively corrected. However, when the condition deviates from the range of condition (5), it is difficult to correct coma, astigmatism, and other aberrations during image stabilization while achieving miniaturization and weight reduction, which is therefore undesirable. Furthermore, to reliably obtain the effect of condition (5), it is more preferable to set the upper limit of condition (5) to 0.038, 0.036, or even 0.035. Furthermore, to reliably obtain the effect of condition (5), it is more preferable to set the lower limit of condition (5) to 0.022, 0.024, 0.025, or even 0.027.

[0083] Furthermore, in the zoom optical system ZL of this embodiment, it is preferable that an aperture is provided in the rear group GL, and at least a portion of the aperture located on the image plane side is a focusing group Gf, which moves in the optical axis direction during focusing.

[0084] Furthermore, the zoom optical system ZL in this embodiment preferably satisfies the following conditional expression (6).

[0085] -8.00<(1-βtf 2 )×βtfb 2 <-4.00 (6)

[0086] in,

[0087] βtf: Horizontal magnification of the focus group Gf at the telephoto end.

[0088] βtfb: Horizontal magnification of the group located on the image plane side compared to the focusing group Gf in the telephoto state.

[0089] Condition (6) specifies the conditions for focusing using the focus group Gf. By satisfying condition (6), variations in various aberrations such as spherical aberration, coma, plane curvature, and astigmatism during focusing can be effectively corrected. However, when the condition deviates from its range, it becomes difficult to correct the aberrations under normal conditions, and it is difficult to balance the corrections for spherical aberration, coma, plane curvature, and astigmatism during focusing, which is therefore undesirable. Furthermore, to reliably obtain the effect of condition (6), it is more preferable to set the upper limit of condition (6) to -4.25, -4.50, -4.75, and further to -5.00. Moreover, to reliably obtain the effect of condition (6), it is more preferable to set the lower limit of condition (6) to -7.50, -7.00, -6.50, -6.00, -5.80, and further to -5.50.

[0090] Furthermore, in the zoom optical system ZL of this embodiment, it is preferable that the focusing group Gf has a positive lens and a negative lens sequentially from the object side. By configuring it as described above, variations in axial chromatic aberration and magnification chromatic aberration during focusing can be corrected.

[0091] Furthermore, the zoom optical system ZL in this embodiment preferably satisfies the following conditional expression (7).

[0092] 0.005 <Gfd / TLt<0.015(7)

[0093] in,

[0094] Gfd: Thickness on the optical axis of the focus group Gf

[0095] TLt: Total optical length of the zoom optical system ZL at its telephoto end.

[0096] Condition (7) specifies the ratio of the thickness on the optical axis of the focusing group Gf to the total optical length of the zoom optical system ZL in the telephoto state. By satisfying condition (7), variations in coma, astigmatism, and other aberrations during focusing can be effectively corrected. However, when the condition deviates from its range, it is difficult to correct coma, astigmatism, and other aberrations during focusing while achieving miniaturization and weight reduction, which is therefore undesirable. Furthermore, to reliably obtain the effect of condition (7), it is more preferable to set the upper limit of condition (7) to 0.014, 0.013, or even 0.012. Furthermore, to reliably obtain the effect of condition (7), it is more preferable to set the lower limit of condition (7) to 0.006, 0.007, or even 0.008.

[0097] Furthermore, in the zoom optical system ZL of this embodiment, it is preferable that the first lens group G1 has a negative lens on the side closest to the image plane. As described above, by arranging a positive lens on the side closest to the object in the first lens group G1 and further arranging a negative lens on the side closest to the image plane, the zoom optical system ZL can be miniaturized and made lighter.

[0098] Furthermore, the zoom optical system ZL in this embodiment preferably satisfies the following conditional expression (8).

[0099] 0.04 <G1d / ft<0.15 (8)

[0100] in,

[0101] G1d: Thickness on the optical axis of lens group G1 (first lens group)

[0102] ft: The focal length of the entire system at the telephoto end of the zoom optical system ZL.

[0103] Condition (8) specifies the ratio of the thickness on the optical axis of the first lens group G1 to the focal length of the entire zoom optical system ZL in the telephoto state. By satisfying condition (8), various aberrations can be well corrected. However, when the value is higher than the upper limit of condition (8), the thickness on the optical axis of the first lens group G1 becomes too thick, making it difficult to correct various aberrations such as spherical aberration, axial chromatic aberration, and magnification chromatic aberration, which is not preferable. Furthermore, in order to reliably obtain the effect of condition (8), it is more preferable to set the upper limit of condition (8) to 0.14, 0.13, and further to 0.12. In addition, when the value is lower than the lower limit of condition (8), it is not conducive to miniaturization and weight reduction. When miniaturization and weight reduction are desired, it is difficult to correct various aberrations such as spherical aberration, coma, and image plane curvature, which is not preferable. In addition, in order to reliably obtain the effect of the condition (8), it is more preferable to make the lower limit of the condition (8) 0.05, and further 0.055.

[0104] Furthermore, in the zoom optical system ZL of this embodiment, it is preferable that the rear group GL has a lens group including an aperture (e.g., in...). Figure 1 The zoom optical system ZL satisfies the following condition (9), where G3 is the third lens group.

[0105] 0.05 <Gsd / TLt<0.30 (9)

[0106] in,

[0107] Gsd: The thickness of the lens group containing the aperture along its optical axis.

[0108] TLt: Total optical length of the zoom optical system ZL at its telephoto end.

[0109] Condition (9) specifies the ratio of the thickness of the lens group including the aperture on the optical axis to the total optical length of the zoom optical system ZL in the telephoto end state. By satisfying condition (9), various aberrations such as spherical aberration, image plane curvature, and astigmatism can be effectively corrected. However, when the condition deviates from the range of condition (9), it is difficult to correct various aberrations such as spherical aberration, image plane curvature, and astigmatism while achieving miniaturization and weight reduction, which is therefore undesirable. Furthermore, in order to reliably obtain the effect of condition (9), it is more preferable to set the upper limit value of condition (9) to 0.28, 0.25, 0.23, and more preferably 0.20. Furthermore, in order to reliably obtain the effect of condition (9), it is more preferable to set the lower limit value of condition (9) to 0.06, 0.08, 0.10, 0.12, and more preferably 0.13.

[0110] Furthermore, in the zoom optical system ZL of this embodiment, it is preferable that the first lens group G1 has a negative lens disposed on the side closest to the image plane and a positive lens disposed adjacent to the negative lens on the object side. As described above, by disposing a positive lens on the object side of the first lens group G1, and further disposing a negative lens on the side closest to the image plane and arranging a positive lens adjacent to the negative lens on the object side, the zoom optical system ZL can be miniaturized and made lighter.

[0111] Furthermore, the zoom optical system ZL in this embodiment preferably satisfies the following conditional expression (10).

[0112] 0.015 <D1MAX / ft<0.080 (10)

[0113] in,

[0114] D1MAX: The maximum air gap on the optical axis within the first lens group G1.

[0115] ft: The focal length of the entire system at the telephoto end of the zoom optical system ZL.

[0116] Condition (10) specifies the ratio of the maximum air gap on the optical axis within the first lens group G1 to the focal length of the entire zoom optical system ZL in the telephoto state. By satisfying condition (10), various aberrations can be effectively corrected. However, when the upper limit of condition (10) is exceeded, it becomes difficult to correct various aberrations such as spherical aberration, axial chromatic aberration, and magnification chromatic aberration, which is not preferred. Furthermore, in order to reliably obtain the effect of condition (10), it is more preferable to set the upper limit of condition (10) to 0.075, 0.070, 0.065, 0.060, 0.058, and further to 0.055. In addition, when the lower limit of condition (10) is exceeded, it is not conducive to miniaturization and weight reduction. When miniaturization and weight reduction are desired, it becomes difficult to correct various aberrations such as spherical aberration, coma, and image plane curvature, which is not preferred. In addition, in order to reliably obtain the effect of the condition (10), it is more preferable to make the lower limit value of the condition (10) 0.016, 0.018, or even 0.020.

[0117] Furthermore, the zoom optical system ZL in this embodiment preferably satisfies the following conditional expression (11).

[0118] 0.15 <Bfw / fw<0.50 (11)

[0119] in,

[0120] Bfw: Back focal length of the ZL zoom optical system in wide-angle mode.

[0121] fw: The focal length of the entire system in the wide-angle state of the zoom optical system ZL.

[0122] Condition (11) specifies the ratio of the back focal length of the zoom optical system ZL in the wide-angle end state to the focal length of the entire system. Furthermore, to reliably obtain the effect of condition (11), it is more preferable to set the upper limit of condition (11) to 0.48, 0.45, 0.43, and further to 0.40. Moreover, to reliably obtain the effect of condition (11), it is more preferable to set the lower limit of condition (11) to 0.18, 0.20, 0.23, 0.25, and further to 0.28.

[0123] Furthermore, the zoom optical system ZL in this embodiment preferably satisfies the following conditional expression (12).

[0124] 4.00°<ωw<10.00° (12)

[0125] in,

[0126] ωw: Half field of view of the zoom optical system ZL in its wide-angle end state.

[0127] Condition (12) specifies the range of the half field of view in the wide-angle end state of the zoom optical system ZL. Furthermore, to reliably obtain the effect of condition (12), it is more preferable to set the upper limit of condition (12) to 9.50°, 9.00°, 8.80°, 8.50°, 8.30°, and further to 8.00°. Furthermore, to reliably obtain the effect of condition (12), it is more preferable to set the lower limit of condition (12) to 4.30°, 4.50°, 4.80°, 5.00°, 5.30°, and further to 5.50°.

[0128] In the zoom optical system ZL of this embodiment, it is preferable that the rear group GL, from the object side, sequentially includes a positive lens group, a positive lens group, and a negative lens group. Furthermore, it is preferable that at least a portion of at least one of the positive lens group, the positive lens group, and the negative lens group in the rear group GL is an image stabilization group Gv, which moves in a direction orthogonal to the optical axis. Additionally, at least a portion of at least one of the positive lens group, the positive lens group, and the negative lens group is a focusing group Gf, which moves in the optical axis direction during focusing. By configuring it as described above, it is possible to achieve miniaturization and weight reduction of the zoom optical system ZL while suppressing aberrations during image stabilization and focusing.

[0129] Furthermore, in the zoom optical system ZL of this embodiment, it is preferable that the rear group GL has an image stabilization group Gv, which moves in a manner having a component in a direction orthogonal to the optical axis, and the image stabilization group Gv is a positive lens group.

[0130] Furthermore, in the zoom optical system ZL of this embodiment, it is preferable that the rear group GL has a focusing group Gf, which moves in the optical axis direction during focusing, and the focusing group Gf is a negative lens group.

[0131] Furthermore, in the zoom optical system ZL of this embodiment, it is preferable that the lens group of the rear group GL, which is arranged on the side closest to the image plane, has positive optical power.

[0132] Furthermore, in the zoom optical system ZL of this embodiment, it is preferable that the first lens group G1 is fixed relative to the image plane during zooming. By configuring it as described above, the number of components used in the mechanism that moves the lens group during zooming can be reduced, enabling the zoom optical system ZL to be miniaturized and lightweight. Additionally, deviations in optical performance during zooming can be prevented. Furthermore, it is beneficial to suppress optical performance deviations during manufacturing.

[0133] Furthermore, the conditions and structures described above, which each exert the aforementioned effects, are not limited to systems that satisfy all conditions and structures. Systems that satisfy any one condition or structure, or any combination of conditions or structures, can also achieve the aforementioned effects.

[0134] Next, according to Figure 17 The optical device, i.e., a camera, equipped with the zoom optical system ZL of this embodiment will be described. This camera 1 is a mirrorless camera with an interchangeable lens, incorporating the zoom optical system ZL of this embodiment as the photographic lens 2. In this camera 1, light from an object (subject) not shown is focused by the photographic lens 2 and formed on the imaging surface of the imaging unit 3 via an OLPF (Optical Low Pass Filter) not shown. Furthermore, the subject image is photoelectrically converted by a photoelectric conversion element provided in the imaging unit 3 to generate an image of the subject. This image is displayed on the EVF (Electronic View Finder) 4 provided in the camera 1. Thus, the photographer can observe the subject through the EVF 4.

[0135] Furthermore, when the photographer presses the release button (not shown), the image, which has undergone photoelectric conversion by the imaging unit 3, is stored in a memory (not shown). Thus, the photographer can take photographs of the subject based on this camera 1. Although this embodiment describes a mirrorless camera as an example, the same effect as the camera 1 can be achieved even when an SLR camera with a fast-return mirror and a viewfinder optical system for observing the subject is equipped with the zoom optical system ZL of this embodiment.

[0136] In addition, the following description can be appropriately used within the range that does not impair optical performance.

[0137] In this embodiment, although a zoom optical system ZL with 6 or 7 lens groups is shown as described below, the above structure and conditions can also be applied to other lens groups such as 8 or 9. Furthermore, it is also possible to add a lens or lens group to the side closest to the object, or to the side closest to the image plane. Specifically, a structure in which a lens group is added to the side closest to the image plane, with its position fixed relative to the image plane during zooming or focusing, can be considered. Additionally, a lens group (also simply referred to as a "group") refers to a portion that is separated by air gaps that change during zooming or focusing and has at least one lens. Furthermore, a lens component refers to a single lens or a combined lens formed by joining multiple lenses.

[0138] Alternatively, a focusing group can be formed by moving one or more lens groups, or a portion thereof, along the optical axis to focus on an object at a closer distance from an object at infinity. In this case, the focusing group is also suitable for autofocus and for motor drive (such as an ultrasonic motor) used for autofocus. In particular, it is preferable that at least a portion of the fifth lens group G5 (the sixth lens group G6 in the seventh embodiment) is a focusing group. Furthermore, it is preferable that the positions of the lenses other than the focusing group relative to the image plane are fixed during focusing. Considering the load applied to the motor, the focusing group is preferably composed of a single lens or a single lens component.

[0139] Alternatively, the lens group or a portion thereof can be moved in a manner having a displacement component orthogonal to the optical axis, or rotated (oscillated) in a direction encompassing the optical axis, to serve as an image stabilization group for correcting image shake caused by hand tremors. In particular, it is preferable that at least a portion of the fourth lens group G4 (the fifth lens group G5 in the seventh embodiment) is an image stabilization group.

[0140] Furthermore, the lens surface can be formed from a spherical or flat surface, or from an aspherical surface. When the lens surface is spherical or flat, lens processing and assembly adjustments become easier, preventing degradation of optical performance caused by processing and assembly adjustments errors, thus making it preferred. Additionally, there is less degradation in image performance when the image plane is shifted, making it preferred as well. When the lens surface is aspherical, the aspherical surface can be any of the following: a ground aspherical surface, a glass-molded aspherical surface formed by molding glass into an aspherical shape, or a composite aspherical surface formed by molding resin into an aspherical shape on the surface of glass. Furthermore, the lens surface can also be a diffraction surface, and the lens can be a refractive index distribution lens (GRIN lens) or a plastic lens.

[0141] Although the aperture stop S is preferably configured in the third lens group G3 of the rear group GL (in the fourth lens group G4 in the seventh embodiment), it is also possible to omit the component that serves as the aperture stop and instead use the lens frame to perform its function.

[0142] In addition, to reduce glare and ghosting and achieve high contrast and high optical performance, an antireflective coating with high transmittance over a wide wavelength range can be applied to each lens surface.

[0143] The following is for reference Figure 18 A general description of the manufacturing method of the zoom optical system ZL according to this embodiment will be given. First, a first lens group G1, a second lens group G2, and a rear lens group GL with positive optical power are prepared (step S100). Next, the spacing between each lens group is configured to change during zooming (step S200), and then a positive lens L11 is placed on the object side of the first lens group G1 (step S300). Furthermore, each lens group is configured to satisfy a predetermined condition (for example, the conditional expression (1) described above) (step S400).

[0144] When structured as described above, it can provide a zoom optical system, optical device, and a method for manufacturing a zoom optical system that can achieve miniaturization, lightweighting, and high optical performance.

[0145]

Example

[0146] The embodiments will now be described with reference to the accompanying drawings. Additionally, Figure 1 , Figure 3 , Figure 5 , Figure 7 , Figure 9 , Figure 11 , Figure 13 and Figure 15 These are cross-sectional views showing the structure and optical power distribution of the zoom optical system ZL (ZL1 to ZL8) in each embodiment. Additionally, at the bottom of each figure, the movement trajectory of each lens group of the zoom optical system ZL from the wide-angle end state (W) to the telephoto end state (T) during zooming is shown.

[0147] In various embodiments, regarding aspherical surfaces, when the height perpendicular to the optical axis is y, the distance along the optical axis (indentation amount) from the tangent at the vertex of each aspherical surface to each aspherical surface at height y is S(y), the radius of curvature (paraxial radius of curvature) of the reference sphere is r, the conic constant is K, and the nth-order aspherical coefficient is An, it is represented by the following equation (a). Furthermore, in the following embodiments, "En" represents "×10". -n ".

[0148] S(y)=(y 2 / r) / {1+(1-K×y2 / r 2 ) 1 / 2}+A4×y 4 +A6×y 6 +A8×y 8 +A10×y 10 (a)

[0149] In addition, in each embodiment, the quadratic aspheric coefficient A2 is 0.

[0150] In addition, the following embodiments illustrate specific examples of the invention, but the invention is not limited thereto.

[0151] [First Embodiment]

[0152] Figure 1 This diagram illustrates the structure of the zoom optical system ZL1 according to the first embodiment. From the object side, the zoom optical system ZL1 consists of a first lens group G1 with positive optical power, a second lens group G2 with negative optical power, and a rear lens group GL. Furthermore, from the object side, the rear lens group GL consists of a third lens group G3 with positive optical power, a fourth lens group G4 with positive optical power, a fifth lens group G5 with negative optical power, and a sixth lens group G6 with positive optical power.

[0153] Lens group G1, from the object side, consists of a biconvex positive lens L11 and a combined positive lens formed by combining a biconvex positive lens L12 and a biconcave negative lens L13. Lens group G2, from the object side, consists of a combined negative lens formed by combining a biconvex positive lens L21 and a biconcave negative lens L22, a combined negative lens formed by combining a biconvex positive lens L23 and a biconcave negative lens L24, and a biconcave negative lens L25. Lens group G3, from the object side, consists of a biconvex positive lens L31, a biconvex positive lens L32, a combined negative lens formed by combining a biconvex positive lens L33 and a biconcave negative lens L34, and a combined negative lens formed by combining a positive meniscus lens L35 (with its concave surface facing the object side) and a biconcave negative lens L36. Lens group G4, from the object side, consists of a biconvex positive lens L41 and a combined negative lens formed by combining a biconvex positive lens L42 and a biconcave negative lens L43. Furthermore, the fifth lens group G5 is composed of a combined lens formed by joining a biconvex positive lens L51 and a biconcave negative lens L52 from the object side. The sixth lens group G6 is composed of a combined positive lens formed by joining a biconcave negative lens L61 with an aspherical surface formed on the object side lens surface and a biconvex positive lens L62 from the object side.

[0154] Additionally, the aperture stop S is positioned between the biconcave negative lens L34 and the positive meniscus lens L35 in the third lens group G3. Furthermore, a filter group FL is positioned between the rear group GL and the image plane I.

[0155] In the zoom optical system ZL1, during zooming, the second lens group G2, the third lens group G3, the fourth lens group G4, the fifth lens group G5, and the sixth lens group G6 move along the optical axis, causing the spacing between the lens groups to change. Additionally, during zooming, the first lens group G1 remains fixed relative to the image plane I.

[0156] In addition, in this zoom optical system ZL1, the image position is corrected (stabilized) when hand shakiness occurs by making the fourth lens group G4 the image stabilization group Gv and moving the image stabilization group Gv in a manner with a displacement component in a direction orthogonal to the optical axis.

[0157] Furthermore, in this zoom optical system ZL1, focusing is performed from infinity to a closer object point by making the fifth lens group G5 the focusing group Gf and moving the focusing group Gf along the optical axis to the image side.

[0158] Table 1 below shows the parameter values ​​for the zoom optical system ZL1. In Table 1, the overall parameters f represent the focal length of the entire system, Fno represents the F-number, ω represents the half field of view (maximum incident angle in [°]), Y represents the maximum image height, BF represents the back focal length at infinity focus, and TL represents the total optical length at infinity focus as values ​​for wide-angle, intermediate focal length, and telephoto states. Here, the back focal length BF represents the distance along the optical axis from the lens surface closest to the image plane (surface 36) to image plane I. Furthermore, the total optical length TL represents the distance along the optical axis from the lens surface closest to the object (surface 1) to image plane I. In addition, the first column 'm' in the lens data indicates the order of the lens surfaces (surface number) from the object side along the direction of light travel; the second column 'r' indicates the radius of curvature of each lens surface; the third column 'd' indicates the distance on the optical axis from each optical surface to the next (surface interval); and the fourth and fifth columns 'nd' and 'νd' indicate the refractive index and Abbe number for the d-line (λ = 587.6 nm). Furthermore, the radius of curvature ∞ indicates a plane, omitting the refractive index of air (1.000000). Additionally, in the case of aspherical lens surfaces, an asterisk (*) is appended to the right of the surface number, and the column for radius of curvature 'r' indicates the paraxial radius of curvature. Finally, the focal length of the lens group indicates the initial surface number and focal length of each of the 1st to 6th lens groups G1 to G6.

[0159] Here, although “mm” is generally used for the focal length f, radius of curvature r, interplanar spacing d, and other length units recorded in all the following parameter values, the same optical performance can be obtained even if the optical system is scaled up or scaled down, so it is not limited to this.

[0160] Furthermore, the descriptions of these reference numerals and parameter tables are the same in the following embodiments.

[0161] (Table 1) First Embodiment

[0162] [Overall Parameters]

[0163]

[0164] [Lens Data]

[0165]

[0166]

[0167]

[0168] [Focal length of lens group]

[0169]

[0170] In this zoom optical system ZL1, surface 33 is an aspherical surface. Table 2 below shows the data for the aspherical surface with surface number m, namely the values ​​of the conic constant K and the aspherical constants A4 to A10.

[0171] (Table 2)

[0172] [Aspherical Data]

[0173]

[0174] In this zoom optical system ZL1, the on-axis air gaps d1 between the first lens group G1 and the second lens group G2, d2 between the second lens group G2 and the third lens group G3, d3 between the third lens group G3 and the fourth lens group G4, d4 between the fourth lens group G4 and the fifth lens group G5, d5 between the fifth lens group G5 and the sixth lens group G6, and d6 between the sixth lens group G6 and the filter group FL change during zooming. Table 3 below shows the variable gaps in the wide-angle, intermediate focal length, and telephoto states.

[0175] (Table 3)

[0176] [Variable Interval Data]

[0177]

[0178] Figure 2This diagram shows the spherical aberration, astigmatism, distortion, magnification chromatic aberration, and coma diagrams of the ZL1 zoom optical system at both the wide-angle and telephoto ends when focusing at infinity. In each aberration diagram, FNO represents the F-value, and A represents the half-field of view (in °) for each image height. The spherical aberration diagram shows the F-value for the maximum aperture, the astigmatism and distortion diagrams show the half-field of view values, and the coma diagram shows the values ​​for each half-field of view. In the spherical aberration, magnification chromatic aberration, and coma diagrams, d represents the d-line (λ = 587.6 nm), and g represents the g-line (λ = 435.8 nm). In the astigmatism diagram, solid lines represent the sagittal image plane, and dashed lines represent the meridional image plane. The same symbols as in this embodiment are used in the aberration diagrams of the embodiments shown below. These aberration diagrams demonstrate that the ZL1 zoom optical system effectively corrects various aberrations and exhibits excellent imaging performance.

[0179] [Second Embodiment]

[0180] Figure 3 This diagram illustrates the structure of the zoom optical system ZL2 according to the second embodiment. From the object side, the zoom optical system ZL2 consists of a first lens group G1 with positive optical power, a second lens group G2 with negative optical power, and a rear lens group GL. Furthermore, from the object side, the rear lens group GL consists of a third lens group G3 with positive optical power, a fourth lens group G4 with positive optical power, a fifth lens group G5 with negative optical power, and a sixth lens group G6 with positive optical power.

[0181] The first lens group G1, from the object side, consists of a positive meniscus lens L11 with its convex surface facing the object side, a positive meniscus lens L12 with its convex surface facing the object side, and a combined negative lens formed by combining a biconvex positive lens L13 and a biconcave negative lens L14. The second lens group G2, from the object side, consists of a combined negative lens formed by combining a biconvex positive lens L21 and a biconcave negative lens L22, a combined positive lens formed by combining a biconvex positive lens L23 and a biconcave negative lens L24, and a biconcave negative lens L25. The third lens group G3, from the object side, consists of a biconvex positive lens L31, a biconvex positive lens L32, a combined negative lens formed by combining a biconvex positive lens L33 and a biconcave negative lens L34, and a combined negative lens formed by combining a positive meniscus lens L35 with its concave surface facing the object side and a biconcave negative lens L36. Furthermore, the fourth lens group G4, from the object side, consists of a biconvex positive lens L41 and a combined positive lens formed by joining a biconvex positive lens L42 and a biconcave negative lens L43. The fifth lens group G5, from the object side, consists of a combined negative lens formed by joining a biconvex positive lens L51 and a biconcave negative lens L52. The sixth lens group G6, from the object side, consists of a combined positive lens formed by joining a biconcave, aspherical negative lens L61 with an aspherical surface formed on the object side and a biconvex positive lens L62.

[0182] Additionally, the aperture stop S is positioned between the biconcave negative lens L34 and the positive meniscus lens L35 in the third lens group G3. Furthermore, a filter group FL is positioned between the rear group GL and the image plane I.

[0183] In the zoom optical system ZL2, during zooming, the second lens group G2, the third lens group G3, the fourth lens group G4, the fifth lens group G5, and the sixth lens group G6 move along the optical axis, causing the spacing between the lens groups to change. Additionally, during zooming, the first lens group G1 remains fixed relative to the image plane I.

[0184] In addition, in this zoom optical system ZL2, the image position is corrected (stabilized) when hand shakiness occurs by making the fourth lens group G4 the image stabilization group Gv and moving the image stabilization group Gv in a manner with a displacement component in a direction orthogonal to the optical axis.

[0185] Furthermore, in this zoom optical system ZL2, focusing is performed on an object point from infinity to near by making the fifth lens group G5 the focusing group Gf and moving the focusing group Gf along the optical axis to the image side.

[0186] Table 4 below shows the values ​​of the parameters for the ZL2 zoom optical system.

[0187] (Table 4) Example 2

[0188] [Overall Parameters]

[0189]

[0190] [Lens Data]

[0191]

[0192]

[0193]

[0194] [Focal length of lens group]

[0195]

[0196] In this zoom optical system ZL2, the 35th surface is an aspherical surface. Table 5 below shows the data for the aspherical surface with surface number m, namely the values ​​of the conic constant K and the aspherical constants A4 to A10.

[0197] (Table 5)

[0198] [Aspherical Data]

[0199]

[0200] In this zoom optical system ZL2, the on-axis air gaps d1 between the first lens group G1 and the second lens group G2, d2 between the second lens group G2 and the third lens group G3, d3 between the third lens group G3 and the fourth lens group G4, d4 between the fourth lens group G4 and the fifth lens group G5, d5 between the fifth lens group G5 and the sixth lens group G6, and d6 between the sixth lens group G6 and the filter group FL change during zooming. Table 6 below shows the variable gaps for the wide-angle, intermediate focal length, and telephoto ends.

[0201] (Table 6)

[0202] [Variable Interval Data]

[0203]

[0204] Figure 4 The diagrams show spherical aberration, astigmatism, distortion, magnification chromatic aberration, and coma of the ZL2 zoom optical system at both the wide-angle and telephoto ends when focusing at infinity. These aberration diagrams demonstrate that the ZL2 zoom optical system effectively corrects for various aberrations, exhibiting excellent imaging performance.

[0205] [Embodiment 3]

[0206] Figure 5This diagram illustrates the structure of the zoom optical system ZL3 according to the third embodiment. From the object side, the zoom optical system ZL3 consists of a first lens group G1 with positive optical power, a second lens group G2 with negative optical power, and a rear lens group GL. Furthermore, from the object side, the rear lens group GL consists of a third lens group G3 with positive optical power, a fourth lens group G4 with positive optical power, a fifth lens group G5 with negative optical power, and a sixth lens group G6 with positive optical power.

[0207] The first lens group G1, from the object side, consists of a biconvex positive lens L11 and a combined negative lens formed by combining a biconvex positive lens L12 and a biconcave negative lens L13. The second lens group G2, from the object side, consists of a combined negative lens formed by combining a biconvex positive lens L21 and a biconcave negative lens L22, a combined positive lens formed by combining a positive meniscus lens L23 (convex side facing the object) and a negative meniscus lens L24 (convex side facing the object), and a biconcave negative lens L25. The third lens group G3, from the object side, consists of a biconvex positive lens L31, a biconvex positive lens L32, a combined negative lens formed by combining a biconvex positive lens L33 and a biconcave negative lens L34, and a combined negative lens formed by combining a positive meniscus lens L35 (concave side facing the object) and a biconcave negative lens L36. Furthermore, the fourth lens group G4, from the object side, consists of a biconvex positive lens L41 and a combined negative lens formed by joining a biconvex positive lens L42 and a biconcave negative lens L43. The fifth lens group G5, from the object side, consists of a combined negative lens formed by joining a biconvex positive lens L51 and a biconcave negative lens L52. The sixth lens group G6, from the object side, consists of a combined positive lens formed by joining an aspherical negative lens L61 (with a negative meniscus shape and an aspherical surface formed on the object side) and a biconvex positive lens L62.

[0208] Additionally, the aperture stop S is positioned between the biconcave negative lens L34 and the positive meniscus lens L35 in the third lens group G3. Furthermore, a filter group FL is positioned between the rear group GL and the image plane I.

[0209] In the zoom optical system ZL3, during zooming, the second lens group G2, the third lens group G3, the fourth lens group G4, the fifth lens group G5, and the sixth lens group G6 move along the optical axis, causing the spacing between the lens groups to change. Additionally, during zooming, the first lens group G1 remains fixed relative to the image plane I.

[0210] In addition, in this zoom optical system ZL3, the image position is corrected (stabilized) when hand shakiness occurs by making the fourth lens group G4 the image stabilization group Gv and moving the image stabilization group Gv in a manner with a displacement component in a direction orthogonal to the optical axis.

[0211] Furthermore, in this zoom optical system ZL3, focusing is performed on an object point from infinity to near by making the fifth lens group G5 the focusing group Gf and moving the focusing group Gf along the optical axis to the image side.

[0212] Table 7 below shows the values ​​of the parameters for the ZL3 zoom optical system.

[0213] (Table 7) Third Embodiment

[0214] [Overall Parameters]

[0215]

[0216]

[0217] [Lens Data]

[0218]

[0219]

[0220] [Focal length of lens group]

[0221]

[0222] In this zoom optical system ZL3, the 33rd surface is an aspherical surface. Table 8 below shows the data for the aspherical surface with surface number m, namely the values ​​of the conic constant K and the aspherical constants A4 to A10.

[0223] (Table 8)

[0224] [Aspherical Data]

[0225]

[0226] In this zoom optical system ZL3, the on-axis air gaps d1 between the first lens group G1 and the second lens group G2, d2 between the second lens group G2 and the third lens group G3, d3 between the third lens group G3 and the fourth lens group G4, d4 between the fourth lens group G4 and the fifth lens group G5, d5 between the fifth lens group G5 and the sixth lens group G6, and d6 between the sixth lens group G6 and the filter group FL change during zooming. Table 9 below shows the variable gaps in the wide-angle, intermediate focal length, and telephoto states.

[0227] (Table 9)

[0228] [Variable Interval Data]

[0229]

[0230] Figure 6 The diagrams show spherical aberration, astigmatism, distortion, magnification chromatic aberration, and coma of the ZL3 zoom optical system at both the wide-angle and telephoto ends when focusing at infinity. These aberration diagrams demonstrate that the ZL3 zoom optical system effectively corrects for various aberrations, exhibiting excellent imaging performance.

[0231] [Example 4]

[0232] Figure 7 This diagram illustrates the structure of the zoom optical system ZL4 according to the fourth embodiment. From the object side, the zoom optical system ZL4 consists of a first lens group G1 with positive optical power, a second lens group G2 with negative optical power, and a rear lens group GL. Furthermore, from the object side, the rear lens group GL consists of a third lens group G3 with positive optical power, a fourth lens group G4 with positive optical power, a fifth lens group G5 with negative optical power, and a sixth lens group G6 with positive optical power.

[0233] The first lens group G1, from the object side, consists of a positive meniscus lens L11 with its convex surface facing the object side, a biconvex positive lens L12, and a combined negative lens formed by joining a biconvex positive lens L13 and a biconcave negative lens L14. The second lens group G2, from the object side, consists of a combined negative lens formed by joining a biconvex positive lens L21 and a biconcave negative lens L22, a combined positive lens formed by joining a biconvex positive lens L23 and a biconcave negative lens L24, and a biconcave negative lens L25. The third lens group G3, from the object side, consists of a biconvex positive lens L31, a biconvex positive lens L32, a combined negative lens formed by joining a biconvex positive lens L33 and a biconcave negative lens L34, and a combined negative lens formed by joining a biconvex positive lens L35 and a biconcave negative lens L36. Furthermore, the fourth lens group G4, from the object side, consists of a biconvex positive lens L41 and a combined positive lens formed by joining a biconvex positive lens L42 and a biconcave negative lens L43. The fifth lens group G5, from the object side, consists of a combined negative lens formed by joining a biconvex positive lens L51 and a biconcave negative lens L52. The sixth lens group G6, from the object side, consists of a combined positive lens formed by joining a biconcave, aspherical negative lens L61 with an aspherical surface formed on the object side and a biconvex positive lens L62.

[0234] Additionally, the aperture stop S is positioned between the biconcave negative lens L34 and the biconvex positive lens L35 of the third lens group G3. Furthermore, a filter group FL is positioned between the rear group GL and the image plane I.

[0235] In the zoom optical system ZL4, during zooming, the second lens group G2, the third lens group G3, the fourth lens group G4, the fifth lens group G5, and the sixth lens group G6 move along the optical axis, causing the spacing between the lens groups to change. Additionally, during zooming, the first lens group G1 remains fixed relative to the image plane I.

[0236] In addition, in this zoom optical system ZL4, the image position is corrected (stabilized) when hand shakiness occurs by making the fourth lens group G4 the image stabilization group Gv and moving the image stabilization group Gv in a manner with a displacement component in a direction orthogonal to the optical axis.

[0237] In addition, in this zoom optical system ZL4, focusing is performed from infinity to a closer object point by making the fifth lens group G5 the focusing group Gf and moving the focusing group Gf along the optical axis to the image side.

[0238] Table 10 below shows the values ​​of the parameters for the ZL4 zoom optical system.

[0239] (Table 10) Example 4

[0240] [Overall Parameters]

[0241]

[0242] [Lens Data]

[0243]

[0244]

[0245]

[0246] [Focal length of lens group]

[0247]

[0248] In this zoom optical system ZL4, surface 35 is an aspherical surface. Table 11 below shows the data for the aspherical surface with surface number m, namely the values ​​of the conic constant K and the aspherical constants A4 to A10.

[0249] (Table 11)

[0250] [Aspherical Data]

[0251]

[0252] In this zoom optical system ZL4, the on-axis air gaps d1 between the first lens group G1 and the second lens group G2, d2 between the second lens group G2 and the third lens group G3, d3 between the third lens group G3 and the fourth lens group G4, d4 between the fourth lens group G4 and the fifth lens group G5, d5 between the fifth lens group G5 and the sixth lens group G6, and d6 between the sixth lens group G6 and the filter group FL change during zooming. Table 12 below shows the variable gaps in the wide-angle, intermediate focal length, and telephoto states.

[0253] (Table 12)

[0254] [Variable Interval Data]

[0255]

[0256] Figure 8 The diagrams show spherical aberration, astigmatism, distortion, magnification chromatic aberration, and coma of the ZL4 zoom optical system at both the wide-angle and telephoto ends when focused at infinity. These aberration diagrams demonstrate that the ZL4 zoom optical system effectively corrects for various aberrations, exhibiting excellent imaging performance.

[0257] [Version 5]

[0258] Figure 9 This diagram illustrates the structure of the zoom optical system ZL5 according to the fifth embodiment. From the object side, the zoom optical system ZL5 consists of a first lens group G1 with positive optical power, a second lens group G2 with negative optical power, and a rear lens group GL. Furthermore, from the object side, the rear lens group GL consists of a third lens group G3 with positive optical power, a fourth lens group G4 with positive optical power, a fifth lens group G5 with negative optical power, and a sixth lens group G6 with positive optical power.

[0259] The first lens group G1, from the object side, consists of a biconvex positive lens L11 and a combined positive lens formed by combining a biconvex positive lens L12 and a biconcave negative lens L13. The second lens group G2, from the object side, consists of a combined negative lens formed by combining a biconvex positive lens L21 and a biconcave negative lens L22, a combined positive lens formed by combining a positive meniscus lens L23 (convex side facing the object) and a negative meniscus lens L24 (convex side facing the object), and a biconcave negative lens L25. The third lens group G3, from the object side, consists of a biconvex positive lens L31, a biconvex positive lens L32, a combined negative lens formed by combining a biconvex positive lens L33 and a biconcave negative lens L34, and a combined negative lens formed by combining a positive meniscus lens L35 (concave side facing the object) and a biconcave negative lens L36. Furthermore, the fourth lens group G4, from the object side, consists of a biconvex positive lens L41 and a combined negative lens formed by joining a biconvex positive lens L42 and a biconcave negative lens L43. The fifth lens group G5, from the object side, consists of a combined negative lens formed by joining a biconvex positive lens L51 and a biconcave negative lens L52. The sixth lens group G6, from the object side, consists of a combined positive lens formed by joining an aspherical negative lens L61 (with a negative meniscus shape and an aspherical surface formed on the object side) and a biconvex positive lens L62.

[0260] Additionally, the aperture stop S is positioned between the biconcave negative lens L34 and the positive meniscus lens L35 in the third lens group G3. Furthermore, a filter group FL is positioned between the rear group GL and the image plane I.

[0261] In the ZL5 zoom optical system, during zooming, the second lens group G2, the third lens group G3, the fourth lens group G4, the fifth lens group G5, and the sixth lens group G6 move along the optical axis, causing the spacing between the lens groups to change. Additionally, during zooming, the first lens group G1 remains fixed relative to the image plane I.

[0262] In addition, in this zoom optical system ZL5, the image position is corrected (stabilized) when hand shakiness occurs by making the fourth lens group G4 the image stabilization group Gv and moving the image stabilization group Gv in a manner with a displacement component in a direction orthogonal to the optical axis.

[0263] In addition, in this zoom optical system ZL5, focusing is performed from infinity to a closer object point by making the fifth lens group G5 the focusing group Gf and moving the focusing group Gf along the optical axis to the image side.

[0264] Table 13 below shows the values ​​of the parameters for the ZL5 zoom optical system.

[0265] (Table 13) Fifth Embodiment

[0266] [Overall Parameters]

[0267]

[0268] [Lens Data]

[0269]

[0270]

[0271] [Focal length of lens group]

[0272]

[0273] In this zoom optical system ZL5, surface 33 is an aspherical surface. Table 14 below shows the data for the aspherical surface with surface number m, namely the values ​​of the conic constant K and the aspherical constants A4 to A10.

[0274] (Table 14)

[0275] [Aspherical Data]

[0276]

[0277] In this zoom optical system ZL5, the on-axis air gaps d1 between the first lens group G1 and the second lens group G2, d2 between the second lens group G2 and the third lens group G3, d3 between the third lens group G3 and the fourth lens group G4, d4 between the fourth lens group G4 and the fifth lens group G5, d5 between the fifth lens group G5 and the sixth lens group G6, and d6 between the sixth lens group G6 and the filter group FL change during zooming. Table 15 below shows the variable gaps in the wide-angle, intermediate focal length, and telephoto states.

[0278] (Table 15)

[0279] [Variable Interval Data]

[0280]

[0281] Figure 10 The diagrams show spherical aberration, astigmatism, distortion, magnification chromatic aberration, and coma of the ZL5 zoom optical system at both the wide-angle and telephoto ends when focusing at infinity. These aberration diagrams demonstrate that the ZL5 zoom optical system effectively corrects for various aberrations, exhibiting excellent imaging performance.

[0282] [Sixth Embodiment]

[0283] Figure 11This diagram illustrates the structure of the zoom optical system ZL6 according to the sixth embodiment. From the object side, the zoom optical system ZL6 consists of a first lens group G1 with positive optical power, a second lens group G2 with negative optical power, and a rear lens group GL. Furthermore, from the object side, the rear lens group GL consists of a third lens group G3 with positive optical power, a fourth lens group G4 with positive optical power, a fifth lens group G5 with negative optical power, and a sixth lens group G6 with negative optical power.

[0284] The first lens group G1, from the object side, consists of a positive meniscus lens L11 (convex side facing the object), a biconvex positive lens L12, and a combined negative lens formed by combining a biconvex positive lens L13 and a biconcave negative lens L14. The second lens group G2, from the object side, consists of a combined negative lens formed by combining a biconvex positive lens L21 and a biconcave negative lens L22, a combined positive lens formed by combining a biconvex positive lens L23 and a biconcave negative lens L24, and a biconcave negative lens L25. The third lens group G3, from the object side, consists of a biconvex positive lens L31, a biconvex positive lens L32, a combined negative lens formed by combining a biconvex positive lens L33 and a biconcave negative lens L34, and a combined negative lens formed by combining a positive meniscus lens L35 (concave side facing the object) and a biconcave negative lens L36. Furthermore, the fourth lens group G4, from the object side, consists of a biconvex positive lens L41 and a combined positive lens formed by joining a biconvex positive lens L42 and a biconcave negative lens L43. The fifth lens group G5, from the object side, consists of a combined negative lens formed by joining a biconvex positive lens L51 and a biconcave negative lens L52. The sixth lens group G6, from the object side, consists of a combined negative lens formed by joining a biconcave aspherical negative lens L61 with an aspherical surface formed on the object side and a biconvex positive lens L62.

[0285] Additionally, the aperture stop S is positioned between the biconcave negative lens L34 and the positive meniscus lens L35 in the third lens group G3. Furthermore, a filter group FL is positioned between the rear group GL and the image plane I.

[0286] In the ZL6 zoom optical system, during zooming, the second lens group G2, the third lens group G3, the fourth lens group G4, the fifth lens group G5, and the sixth lens group G6 move along the optical axis, causing the spacing between the lens groups to change. Additionally, during zooming, the first lens group G1 remains fixed relative to the image plane I.

[0287] In addition, in this zoom optical system ZL6, the image position is corrected (stabilized) when hand shakiness occurs by making the fourth lens group G4 the image stabilization group Gv and moving the image stabilization group Gv in a manner with a displacement component in a direction orthogonal to the optical axis.

[0288] In addition, in this zoom optical system ZL6, focusing is performed from infinity to a closer object point by making the fifth lens group G5 the focusing group Gf and moving the focusing group Gf along the optical axis to the image side.

[0289] Table 16 below shows the values ​​of the parameters for the ZL6 zoom optical system.

[0290] (Table 16) Example 6

[0291] [Overall Parameters]

[0292]

[0293] [Lens Data]

[0294]

[0295]

[0296]

[0297] [Focal length of lens group]

[0298]

[0299] In this zoom optical system ZL6, surface 35 is an aspherical surface. Table 17 below shows the data for the aspherical surface with surface number m, namely the values ​​of the conic constant K and the aspherical constants A4 to A10.

[0300] (Table 17)

[0301] [Aspherical Data]

[0302]

[0303] In this zoom optical system ZL6, the on-axis air gaps d1 between the first lens group G1 and the second lens group G2, d2 between the second lens group G2 and the third lens group G3, d3 between the third lens group G3 and the fourth lens group G4, d4 between the fourth lens group G4 and the fifth lens group G5, d5 between the fifth lens group G5 and the sixth lens group G6, and d6 between the sixth lens group G6 and the filter group FL change during zooming. Table 18 below shows the variable gaps for the wide-angle, intermediate focal length, and telephoto ends.

[0304] (Table 18)

[0305] [Variable Interval Data]

[0306]

[0307] Figure 12 The diagrams show spherical aberration, astigmatism, distortion, magnification chromatic aberration, and coma of the ZL6 zoom optical system at both the wide-angle and telephoto ends when focusing at infinity. These aberration diagrams demonstrate that the ZL6 zoom optical system effectively corrects for various aberrations, exhibiting excellent imaging performance.

[0308] [Seventh Embodiment]

[0309] Figure 13 This diagram illustrates the structure of the zoom optical system ZL7 according to the seventh embodiment. From the object side, the zoom optical system ZL7 consists of a first lens group G1 with positive optical power, a second lens group G2 with negative optical power, and a rear lens group GL. Furthermore, from the object side, the rear lens group GL consists of a third lens group G3 with negative optical power, a fourth lens group G4 with positive optical power, a fifth lens group G5 with positive optical power, a sixth lens group G6 with negative optical power, and a seventh lens group G7 with negative optical power.

[0310] The first lens group G1, from the object side, consists of a positive meniscus lens L11 (convex side facing the object), a biconvex positive lens L12, and a combined negative lens formed by combining a biconvex positive lens L13 and a biconcave negative lens L14. The second lens group G2, from the object side, consists of a combined negative lens formed by combining a biconvex positive lens L21 and a biconcave negative lens L22, and a combined positive lens formed by combining a biconvex positive lens L23 and a biconcave negative lens L24. The third lens group G3 consists of a biconcave negative lens L31. The fourth lens group G4, from the object side, consists of a biconvex positive lens L41, a biconvex positive lens L42, a combined negative lens formed by combining a biconvex positive lens L43 and a biconcave negative lens L44, and a combined negative lens formed by combining a positive meniscus lens L45 (concave side facing the object) and a biconcave negative lens L46. Furthermore, the fifth lens group G5, from the object side, consists of a biconvex positive lens L51 and a combined positive lens formed by joining a biconvex positive lens L52 and a biconcave negative lens L53. The sixth lens group G6, from the object side, consists of a combined negative lens formed by joining a biconvex positive lens L61 and a biconcave negative lens L62. The seventh lens group G7, from the object side, consists of a combined negative lens formed by joining a biconcave, aspherical negative lens L71 with an aspherical surface formed on the object side and a biconvex positive lens L72.

[0311] Additionally, the aperture stop S is positioned between the biconcave negative lens L44 and the positive meniscus lens L45 in the fourth lens group G4. Furthermore, a filter group FL is positioned between the rear group GL and the image plane I.

[0312] In the ZL7 zoom optical system, during zooming, the second lens group G2, the third lens group G3, the fourth lens group G4, the fifth lens group G5, the sixth lens group G6, and the seventh lens group G7 move along the optical axis, causing the spacing between the lens groups to change. Additionally, during zooming, the first lens group G1 remains fixed relative to the image plane I.

[0313] In addition, in this zoom optical system ZL7, the image position is corrected (stabilized) when hand shakiness occurs by making the fifth lens group G5 the image stabilization group Gv and moving the image stabilization group Gv in a manner with a displacement component in a direction orthogonal to the optical axis.

[0314] Furthermore, in this zoom optical system ZL7, focusing is performed from infinity to a closer object point by making the sixth lens group G6 the focusing group Gf and moving the focusing group Gf along the optical axis to the image side.

[0315] Table 19 below shows the values ​​of the parameters for the ZL7 zoom optical system.

[0316] (Table 19) Example 7

[0317] [Overall Parameters]

[0318]

[0319] [Lens Data]

[0320]

[0321]

[0322] [Focal length of lens group]

[0323]

[0324]

[0325] In this zoom optical system ZL7, surface 35 is an aspherical surface. Table 20 below shows the data for the aspherical surface with surface number m, namely the values ​​of the conic constant K and the aspherical constants A4 to A10.

[0326] (Table 20)

[0327] [Aspherical Data]

[0328]

[0329] In this zoom optical system ZL7, the on-axis air gaps d1 between the first lens group G1 and the second lens group G2, d2 between the second lens group G2 and the third lens group G3, d3 between the third lens group G3 and the fourth lens group G4, d4 between the fourth lens group G4 and the fifth lens group G5, d5 between the fifth lens group G5 and the sixth lens group G6, d6 between the sixth lens group G6 and the seventh lens group G7, and d7 between the seventh lens group G7 and the filter group FL change during zooming. Table 21 below shows the variable gaps in the wide-angle, intermediate focal length, and telephoto states.

[0330] (Table 21)

[0331] [Variable Interval Data]

[0332]

[0333]

[0334] Figure 14 The diagrams show spherical aberration, astigmatism, distortion, magnification chromatic aberration, and coma of the ZL7 zoom optical system at both the wide-angle and telephoto ends when focusing at infinity. These aberration diagrams demonstrate that the ZL7 zoom optical system effectively corrects for various aberrations, exhibiting excellent imaging performance.

[0335] [Embodiment 8]

[0336] Figure 15 This diagram illustrates the structure of the zoom optical system ZL8 according to the eighth embodiment. From the object side, the zoom optical system ZL8 consists of a first lens group G1 with positive optical power, a second lens group G2 with negative optical power, and a rear lens group GL. Furthermore, from the object side, the rear lens group GL consists of a third lens group G3 with positive optical power, a fourth lens group G4 with positive optical power, a fifth lens group G5 with negative optical power, a sixth lens group G6 with positive optical power, and a seventh lens group G7 with negative optical power.

[0337] The first lens group G1, from the object side, consists of a positive meniscus lens L11 with its convex surface facing the object side, a positive meniscus lens L12 with its convex surface facing the object side, and a combined negative lens formed by combining a biconvex positive lens L13 and a biconcave negative lens L14. The second lens group G2, from the object side, consists of a combined negative lens formed by combining a biconvex positive lens L21 and a biconcave negative lens L22, a combined positive lens formed by combining a biconvex positive lens L23 and a biconcave negative lens L24, and a biconcave negative lens L25. The third lens group G3, from the object side, consists of a biconvex positive lens L31, a biconvex positive lens L32, a combined negative lens formed by combining a biconvex positive lens L33 and a biconcave negative lens L34, and a combined negative lens formed by combining a positive meniscus lens L35 with its concave surface facing the object side and a biconcave negative lens L36. Furthermore, the fourth lens group G4, from the object side, consists of a biconvex positive lens L41 and a combined positive lens formed by joining a biconvex positive lens L42 and a biconcave negative lens L43. The fifth lens group G5, from the object side, consists of a combined negative lens formed by joining a biconvex positive lens L51 and a biconcave negative lens L52. The sixth lens group G6, from the object side, consists of a combined positive lens formed by joining an aspherical negative lens L61 (with a negative meniscus shape and an aspherical surface formed on the object side) and a biconvex positive lens L62. The seventh lens group G7 consists of a plano-concave negative lens L71 with its concave surface facing the image plane.

[0338] Additionally, the aperture stop S is positioned between the biconcave negative lens L34 and the positive meniscus lens L35 in the third lens group G3. Furthermore, a filter group FL is positioned between the rear group GL and the image plane I.

[0339] In the ZL7 zoom optical system, during zooming, the second lens group G2, the third lens group G3, the fourth lens group G4, the fifth lens group G5, the sixth lens group G6, and the seventh lens group G7 move along the optical axis, causing the spacing between the lens groups to change. Additionally, during zooming, the first lens group G1 remains fixed relative to the image plane I.

[0340] In addition, in this zoom optical system ZL7, the image position is corrected (stabilized) when hand shakiness occurs by making the fourth lens group G4 the image stabilization group Gv and moving the image stabilization group Gv in a manner with a displacement component in a direction orthogonal to the optical axis.

[0341] Furthermore, in this zoom optical system ZL7, focusing is performed from infinity to a closer object point by making the fifth lens group G5 the focusing group Gf and moving the focusing group Gf along the optical axis to the image side.

[0342] Table 22 below shows the values ​​of the parameters for the ZL8 zoom optical system.

[0343] (Table 22) Example 8

[0344] [Overall Parameters]

[0345]

[0346]

[0347] [Lens Data]

[0348]

[0349]

[0350] [Focal length of lens group]

[0351]

[0352]

[0353] In this zoom optical system ZL8, surface 35 is an aspherical surface. Table 23 below shows the data for the aspherical surface with surface number m, namely the values ​​of the conic constant K and the aspherical constants A4 to A10.

[0354] (Table 23)

[0355] [Aspherical Data]

[0356]

[0357] In this zoom optical system ZL8, the on-axis air gaps d1 between the first lens group G1 and the second lens group G2, d2 between the second lens group G2 and the third lens group G3, d3 between the third lens group G3 and the fourth lens group G4, d4 between the fourth lens group G4 and the fifth lens group G5, d5 between the fifth lens group G5 and the sixth lens group G6, d6 between the sixth lens group G6 and the seventh lens group G7, and d7 between the seventh lens group G7 and the filter group FL change during zooming. Table 24 below shows the variable gaps in the wide-angle, intermediate focal length, and telephoto states.

[0358] (Table 24)

[0359] [Variable Interval Data]

[0360]

[0361]

[0362] Figure 16The diagrams show spherical aberration, astigmatism, distortion, magnification chromatic aberration, and coma of the ZL8 zoom optical system at both the wide-angle and telephoto ends when focusing at infinity. These aberration diagrams demonstrate that the ZL8 zoom optical system effectively corrects for various aberrations, exhibiting excellent imaging performance.

[0363] [Conditional expression corresponding value]

[0364] Table 25 below records the corresponding values ​​of conditional expressions (1) to (12) in embodiments 1 to 8.

[0365] (Table 25)

[0366] (1)D1MAX / G1d

[0367] (2)D1MAX / f1

[0368] (3)f1 / ft

[0369] (4)(1-βtv)×βtvb

[0370] (5)Gvd / TLt

[0371] (6)(1-βtf 2 )×βtfb 2

[0372] (7)Gfd / TLt

[0373] (8)G1d / ft

[0374] (9)Gsd / TLt

[0375] (10)D1MAX / ft

[0376] (11)Bfw / fw

[0377] (12)ωw

[0378]

[0379]

[0380] Explanation of reference numerals in the attached figures:

[0381] 1. Camera (Optical Equipment) ZL (ZL1~ZL8) Zoom Optical System

[0382] G1 is the first lens group; G2 is the second lens group; GL is the rear lens group.

[0383] Gv (Image Stabilization), Gf (Focus Group), S (Aperture Stop).

Claims

1. A zoom optical system, comprising: The first lens group is positioned closest to the object and has positive optical power; The second lens group; and Rear group, During zooming, the spacing between the lens groups changes. The first lens group has a positive lens on the side closest to the object. An aperture is located within the rear group. Compared to the aperture, at least a portion of which is located on the image plane side constitutes an image stabilization group, this image stabilization group moves in a manner having a component in a direction orthogonal to the optical axis. The latter group has: The first positive lens group, including the aperture, has positive optical power and is composed of 6 lenses; The second positive lens group, adjacent to the first positive lens group and located on the image plane side compared to the first positive lens group, has positive optical power and is composed of 3 lenses; and The negative lens group, adjacent to the second positive lens group and located on the image plane side compared to the second positive lens group, has negative optical power and consists of two lenses. The zoom optical system satisfies the following condition: 0.30 <D1MAX / G1d<0.70 1.50 < (1-βtv) × βtvb < 3.00 in, D1MAX: The maximum air gap on the optical axis within the first lens group. G1d: The thickness of the first lens group on the optical axis. βtv: The lateral magnification of the image stabilization group in telephoto mode. βtvb: The lateral magnification of the image stabilization group relative to the group located on the image plane side in the telephoto state.

2. A zoom optical system, comprising: The first lens group is positioned closest to the object and has positive optical power; The second lens group; and Rear group, During zooming, the spacing between the lens groups changes. The first lens group has a positive lens on the side closest to the object. An aperture is located within the rear group. Compared to the aperture located at least a portion on the image plane side that constitutes an image stabilization group, this image stabilization group moves in a manner having a component in a direction orthogonal to the optical axis. The latter group has: The first positive lens group, including the aperture, has positive optical power and is composed of 6 lenses; The second positive lens group, adjacent to the first positive lens group and located on the image plane side compared to the first positive lens group, has positive optical power and is composed of 3 lenses; and The negative lens group, adjacent to the second positive lens group and located on the image plane side compared to the second positive lens group, has negative optical power and consists of two lenses. The zoom optical system satisfies the following condition: 0.064 <D1MAX / f1<0.140 1.50 < (1-βtv) × βtvb < 3.00 in, D1MAX: The maximum air gap on the optical axis within the first lens group. f1: The focal length of the first lens group βtv: The lateral magnification of the image stabilization group in telephoto mode. βtvb: The lateral magnification of the image stabilization group relative to the group located on the image plane side in the telephoto state.

3. The zoom optical system according to claim 1, wherein, The zoom optical system satisfies the following condition: 0.064 <D1MAX / f1<0.140 in, D1MAX: The maximum air gap on the optical axis within the first lens group. f1: The focal length of the first lens group.

4. The zoom optical system according to any one of claims 1 to 3, wherein, The zoom optical system satisfies the following condition: 0.20 <f1 / ft<0.50 in, f1: The focal length of the first lens group ft: The focal length of the entire system in the telephoto state of the zoom optical system.

5. The zoom optical system according to any one of claims 1 to 3, wherein, The image stabilization assembly consists of a positive lens, a positive lens, and a negative lens, arranged sequentially from the object side. The zoom optical system satisfies the following condition: 0.020 <Gvd / TLt<0.040 in, Gvd: The thickness of the anti-shake group on the optical axis. TLt: The total optical length of the zoom optical system at its far focal length.

6. The zoom optical system according to any one of claims 1 to 3, wherein, Compared to the aperture, at least a portion of which is located on the image plane side and forms a focusing group, this focusing group moves along the optical axis during focusing. The zoom optical system satisfies the following condition: -8.00<(1-βtf 2 )×βtfb 2 <-4.00 in, βtf: The lateral magnification of the focusing group in the telephoto state. βtfb: The lateral magnification of the focusing group relative to the group located on the image plane side in the telephoto state.

7. The zoom optical system according to claim 6, wherein, The focusing group includes a positive lens and a negative lens sequentially from the object side. The zoom optical system satisfies the following condition: 0.005 <Gfd / TLt<0.015 in, Gfd: The thickness of the focusing group on the optical axis. TLt: The total optical length of the zoom optical system at its far focal length.

8. The zoom optical system according to any one of claims 1 to 3, wherein, The first lens group has a negative lens on the side closest to the image plane. The zoom optical system satisfies the following condition: 0.04 <G1d / ft<0.15 in, G1d: The thickness of the first lens group on the optical axis. ft: The focal length of the entire system in the telephoto state of the zoom optical system.

9. The zoom optical system according to any one of claims 1 to 3, wherein, The rear group has a lens group including an aperture. The zoom optical system satisfies the following condition: 0.05 <Gsd / TLt<0.30 in, Gsd: The thickness of the lens group containing the aperture along its optical axis. TLt: The total optical length of the zoom optical system at its far focal length.

10. The zoom optical system according to any one of claims 1 to 3, wherein, The first lens group includes a negative lens disposed on the image plane side and a positive lens disposed adjacent to the negative lens on the object side. The zoom optical system satisfies the following condition: 0.015 <D1MAX / ft<0.080 in, D1MAX: The maximum air gap on the optical axis within the first lens group. ft: The focal length of the entire system in the telephoto state of the zoom optical system.

11. The zoom optical system according to any one of claims 1 to 3, wherein, The zoom optical system satisfies the following condition: 0.15 <Bfw / fw<0.50 in, Bfw: The back focal length of the zoom optical system in its wide-angle state. fw: The focal length of the entire system in the wide-angle state of the zoom optical system.

12. The zoom optical system according to any one of claims 1 to 3, wherein, The zoom optical system satisfies the following condition: 4.00° < ωw < 10.00° in, ωw: The half field of view of the zoom optical system in the wide-angle end state.

13. The zoom optical system according to any one of claims 1 to 3, wherein, The rear group, from the object side, includes the first positive lens group, the second positive lens group, and the negative lens group in sequence.

14. The zoom optical system according to claim 13, wherein, At least a portion of at least one of the first positive lens group, the second positive lens group, and the negative lens group constitutes an image stabilization group, which moves in a manner having a component in a direction orthogonal to the optical axis. At least a portion of at least one of the first positive lens group, the second positive lens group, and the negative lens group is a focusing group that moves in the optical axis direction during focusing.

15. The zoom optical system according to any one of claims 1 to 3, wherein, The image stabilization group is a positive lens group.

16. The zoom optical system according to any one of claims 1 to 3, wherein, The rear group includes a focusing group that moves along the optical axis during focusing. The focusing group is a negative lens group.

17. The zoom optical system according to any one of claims 1 to 3, wherein, The rear lens group, positioned closest to the image plane, has positive optical power.

18. The zoom optical system according to any one of claims 1 to 3, wherein, During zooming, the first lens group is fixed relative to the image plane.

19. An optical device having a zoom optical system as described in any one of claims 1 to 18.

20. A method for manufacturing a zoom optical system, the zoom optical system comprising: a first lens group disposed on the side closest to the object and having positive optical power; a second lens group; and a rear lens group, wherein... The zoom optical system is configured such that the spacing between the lens groups changes during zooming. A positive lens is positioned on the object-side closest to the first lens group. An aperture is configured within the rear group. The zoom optical system is configured such that at least a portion of the aperture located on the image plane side constitutes an image stabilization group, which moves in a manner having a component in a direction orthogonal to the optical axis. The rear group configuration: The first positive lens group, including the aperture, has positive optical power and is composed of 6 lenses; The second positive lens group is adjacent to the first positive lens group and is located on the image plane side compared to the first positive lens group. It has positive optical power and is composed of 3 lenses. as well as The negative lens group, adjacent to the second positive lens group and located on the image plane side compared to the second positive lens group, has negative optical power and consists of two lenses. The zoom optical system is configured to satisfy the following condition: 0.30 <D1MAX / G1d<0.70 1.50 < (1-βtv) × βtvb < 3.00 in, D1MAX: The maximum air gap on the optical axis within the first lens group. G1d: The thickness of the first lens group on the optical axis. βtv: The lateral magnification of the image stabilization group in telephoto mode. βtvb: The lateral magnification of the image stabilization group relative to the group located on the image plane side in the telephoto state.

Images