Variable magnification optical system and imaging device

Abstract

A zoom optical system and an imaging device that corrects various aberrations well in a high zoom ratio range are provided. The zoom optical system is composed of a first lens group having positive refractive power, an intermediate group, and a subsequent group in order from an object side to an image side. The intermediate group is composed of three or less lens groups including a M1 lens group having negative refractive power disposed closest to the object side and a Mr lens group having negative refractive power disposed closest to the image side. A R1 lens group having positive refractive power is disposed closest to the object side of the subsequent group. The first lens group is stationary during zooming. When a focal length of the M1 lens group is fM1 and a focal length of the first lens group is f1, the zoom optical system satisfies the following condition: 0.05 < (-fM1) / f1 < 0.8.

Description

Technical Field

[0001] The present invention relates to a zoom optical system and a camera device. Background Technology

[0002] Previously, as an optical system applicable to video recording devices such as surveillance cameras and digital cameras, the optical system described in Patent Document 1 below has been proposed.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2015-018155

[0004] There is a growing expectation for a zoom optical system that can achieve a high zoom ratio while effectively correcting aberrations across the entire zoom range. These requirements are increasing year by year. Summary of the Invention

[0005] The present invention provides a zoom optical system that achieves a high zoom ratio while effectively correcting various aberrations throughout the zoom range, and a camera device equipped with the zoom optical system.

[0006] The zoom optical system according to one aspect of the present invention is composed of a first lens group with positive refractive power, an intermediate group, and a subsequent group, arranged sequentially from the object side to the image side. In the intermediate group, an M1 lens group with negative refractive power is arranged closest to the object side, and a Mr lens group with negative refractive power is arranged closest to the image side. The intermediate group consists of three or fewer lens groups with refractive power, including the M1 and Mr lens groups. In the subsequent group, an R1 lens group with positive refractive power is arranged closest to the object side. During zooming, the first lens group is fixed relative to the image plane, and the spacing between all adjacent lens groups changes. Furthermore, the zoom optical system satisfies the following conditional expression (1):

[0007] 0.05<(-fM1) / f1<0.8 (1).

[0008] Here, the focal length of lens group M1 is set to fM1, and the focal length of lens group 1 is set to f1.

[0009] When the focal length of the R1 lens group is set to fR1, the zoom optical system described above preferably satisfies the following condition (2):

[0010] 0.05<fR1 / f1<0.85 (2).

[0011] When the focal length of the Mr lens group is set to fMr, the zoom optical system described above preferably satisfies the following condition (3):

[0012] 0.8 < fMr / fM1 < 7 (3).

[0013] When the distance on the optical axis from the object-side surface of the first lens group to the image-side surface of the first lens group is set to DG1, and the distance on the optical axis from the object-side surface of the first lens group to the image-side surface of the subsequent lens group is set to Dsum when focusing on an object at infinity at the wide-angle end, the zoom optical system described above preferably satisfies the following condition (4):

[0014] 0.012<DG1 / Dsum<0.25 (4).

[0015] When the focal length of the zoom optical system is set to fw when focusing on an object at infinity at the wide-angle end, the zoom optical system described above preferably satisfies the following condition (5):

[0016] 0.08 < fw / f1 < 0.3 (5).

[0017] When the focal length of the zoom optical system is set to fw when focusing on an object at infinity at the wide-angle end, the zoom optical system described above preferably satisfies the following condition (6):

[0018] -3<fw / fM1<-0.2 (6)。

[0019] When the focal length of the zoom optical system is set to fw for the entire system and the focal length of the R1 lens group is set to fR1, the zoom optical system described above preferably satisfies the following condition (7):

[0020] 0.1 < fw / fR1 < 1.4 (7).

[0021] When the focal length of the zoom optical system is set to fw when focusing on an object at infinity at the wide-angle end and to ft when focusing on an object at infinity at the telephoto end, the zoom optical system described above preferably satisfies the following condition (8):

[0022] 0.6 < f1 / (fw×ft) 1 / 2 <4 (8).

[0023] When the focal length of the zoom optical system is set to fw when focusing on an object at infinity at the wide-angle end and to ft when focusing on an object at infinity at the telephoto end, the zoom optical system described above preferably satisfies the following condition (9):

[0024] 9 < ft / fw < 60 (9).

[0025] In the subsequent group, which includes an anti-shake group that moves in a direction intersecting the optical axis during image shake correction, when the focal length of the zoom optical system as a whole is set to fw and the focal length of the anti-shake group is set to fois, the zoom optical system described above preferably satisfies the following condition (10):

[0026] 0.1<fw / |fois|<1.5 (10).

[0027] In the subsequent group including the anti-vibration group, when the overall focal length of the zoom optical system is set to ft when focusing on an object at infinity at the telephoto end, the maximum half angle of view is set to ωw when focusing on an object at infinity at the wide-angle end, and the maximum half angle of view is set to ωt when focusing on an object at infinity at the telephoto end, the zoom optical system of the above manner preferably satisfies the following condition (11):

[0028] 0.6 < (fw × tanωw) / (ft × tanωt) < 0.98 (11).

[0029] When the refractive index of the lens included in the zoom optical system relative to the d-line is set to Nd, and the Abbe number of the d-line reference of the lens included in the zoom optical system is set to νd, the zoom optical system in the above manner includes at least one specific lens that satisfies the following conditional expressions (12) and (13):

[0030] 2.435<Nd+0.01425×νd<2.75 (12)

[0031] 15<νd<39 (13)。

[0032] When the partial dispersion ratio between the g-line and F-line of the lens included in the zoom optical system is set to θgF, a particular lens preferably satisfies the following condition (14):

[0033] 0.65<θgF+0.00316×νd<0.85 (14).

[0034] When the maximum effective diameter of the lens with the largest effective diameter among the specific lenses included in the zoom optical system is set to EDL, the focal length of the entire zoom optical system when focusing on an object at infinity at the telephoto end is set to ft, and the maximum half angle of view when focusing on an object at infinity at the telephoto end is set to ωt, the zoom optical system in the above manner preferably satisfies the following conditional expression (15).

[0035] 0.1<EDL / (2×ft×tanωt)<2 (15).

[0036] The intermediate group preferably includes at least one specific lens.

[0037] The subsequent group preferably includes at least one specific lens.

[0038] In a zoom optical system comprising at least one joining lens, the at least one joining lens of the zoom optical system preferably comprises a specific lens.

[0039] The intermediate group can be configured as a group of 3 lenses.

[0040] The M1 lens group can be configured to include two or more positive lenses and three or more negative lenses.

[0041] Another aspect of the present invention is a camera device having a zoom optical system as described above.

[0042] In addition, the terms "composed of" and "composed of" in this specification mean that, in addition to the constituent elements listed, it may also include lenses that do not substantially have refractive power, as well as optical elements other than lenses such as apertures, filters and cover glass, and mechanism parts such as lens flanges, lens barrels, imaging elements and hand shaking correction mechanisms.

[0043] In this manual, "a group with positive refractive power" means that the group as a whole has positive refractive power. Similarly, "a group with negative refractive power" means that the group as a whole has negative refractive power. "A lens with positive refractive power" has the same meaning as "positive lens." "A lens with negative refractive power" has the same meaning as "negative lens." In this manual, "lens group," "vibration damping group," and "focusing group" are not limited to a structure consisting of multiple lenses; they can also be described as a structure consisting of only one lens.

[0044] The number of lens elements in this specification refers to the number of lens elements that constitute the lens. For example, the number of lens elements in a combined lens, which is formed by joining multiple single lenses of different materials, is expressed as the number of single lenses constituting the combined lens. However, a compound aspherical lens (a lens (e.g., a spherical lens) and an aspherical film formed on the lens are integrated and function as a single aspherical lens) is used as a single lens and not considered a combined lens. Unless otherwise specified, the symbols for refractive power and surface shapes related to lenses including aspherical surfaces use the symbols and surface shapes of the paraxial region.

[0045] In this specification, the "focal length" used in the conditional expressions is the paraxial focal length. Unless otherwise specified, the "distance on the optical axis" used in the conditional expressions is the geometric distance. Unless otherwise specified, the values ​​used in the conditional expressions are those taken with the d-line as a reference when focusing on an object at infinity.

[0046] The “d-line,” “C-line,” “F-line,” and “g-line” described in this specification are bright lines. The wavelength of the d-line is considered to be 587.56 nm, the wavelength of the C-line is considered to be 656.27 nm, the wavelength of the F-line is considered to be 486.13 nm, and the wavelength of the g-line is considered to be 435.84 nm.

[0047] Invention Effects

[0048] According to the present invention, a zoom optical system that can achieve a high zoom ratio while effectively correcting various aberrations throughout the zoom range, and a camera device having the zoom optical system, can be provided. Attached Figure Description

[0049] Figure 1 This is a cross-sectional view and a diagram showing the structure and movement trajectory of a zoom optical system corresponding to the zoom optical system of Embodiment 1 and an embodiment thereof.

[0050] Figure 2 yes Figure 1 A cross-sectional view of the structure of the zoom optical system at the wide-angle end, and a diagram used to illustrate the notation of the conditional expressions.

[0051] Figure 3 This is a diagram used to illustrate the effective diameter.

[0052] Figure 4 These are aberration diagrams of the zoom optical system in Example 1.

[0053] Figure 5 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 2.

[0054] Figure 6 These are aberration diagrams of the zoom optical system in Example 2.

[0055] Figure 7 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 3.

[0056] Figure 8 These are aberration diagrams of the zoom optical system in Example 3.

[0057] Figure 9 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 4.

[0058] Figure 10 These are aberration diagrams of the zoom optical system in Example 4.

[0059] Figure 11 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 5.

[0060] Figure 12 These are aberration diagrams of the zoom optical system in Example 5.

[0061] Figure 13 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 6.

[0062] Figure 14 These are aberration diagrams of the zoom optical system in Example 6.

[0063] Figure 15 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 7.

[0064] Figure 16 These are aberration diagrams of the zoom optical system in Example 7.

[0065] Figure 17 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 8.

[0066] Figure 18 These are aberration diagrams of the zoom optical system in Example 8.

[0067] Figure 19 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 9.

[0068] Figure 20 These are aberration diagrams of the zoom optical system in Example 9.

[0069] Figure 21 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 10.

[0070] Figure 22 These are aberration diagrams of the zoom optical system in Example 10.

[0071] Figure 23 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 11.

[0072] Figure 24 These are aberration diagrams of the zoom optical system in Example 11.

[0073] Figure 25 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 12.

[0074] Figure 26 These are aberration diagrams of the zoom optical system in Example 12.

[0075] Figure 27 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 13.

[0076] Figure 28 These are aberration diagrams of the zoom optical system in Example 13.

[0077] Figure 29 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 14.

[0078] Figure 30 These are aberration diagrams of the zoom optical system in Example 14.

[0079] Figure 31 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 15.

[0080] Figure 32 These are aberration diagrams of the zoom optical system in Example 15.

[0081] Figure 33 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 16.

[0082] Figure 34 These are aberration diagrams of the zoom optical system in Example 16.

[0083] Figure 35 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 17.

[0084] Figure 36 These are aberration diagrams of the zoom optical system in Example 17.

[0085] Figure 37 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 18.

[0086] Figure 38 These are aberration diagrams of the zoom optical system in Example 18.

[0087] Figure 39 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 19.

[0088] Figure 40 These are aberration diagrams of the zoom optical system in Example 19.

[0089] Figure 41 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 20.

[0090] Figure 42 These are aberration diagrams of the zoom optical system in Example 20.

[0091] Figure 43 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 21.

[0092] Figure 44 These are aberration diagrams of the zoom optical system in Example 21.

[0093] Figure 45 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 22.

[0094] Figure 46 These are aberration diagrams of the zoom optical system in Example 22.

[0095] Figure 47 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 23.

[0096] Figure 48 These are aberration diagrams of the zoom optical system in Example 23.

[0097] Figure 49 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 24.

[0098] Figure 50 These are aberration diagrams of the zoom optical system in Example 24.

[0099] Figure 51 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 25.

[0100] Figure 52 These are aberration diagrams of the zoom optical system in Example 25.

[0101] Figure 53 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 26.

[0102] Figure 54 These are aberration diagrams of the zoom optical system in Example 26.

[0103] Figure 55 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 27.

[0104] Figure 56 These are aberration diagrams of the zoom optical system in Example 27.

[0105] Figure 57 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 28.

[0106] Figure 58 These are aberration diagrams of the zoom optical system in Example 28.

[0107] Figure 59This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 29.

[0108] Figure 60 These are aberration diagrams of the zoom optical system in Example 29.

[0109] Figure 61 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 30.

[0110] Figure 62 These are aberration diagrams of the zoom optical system in Example 30.

[0111] Figure 63 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 31.

[0112] Figure 64 These are aberration diagrams of the zoom optical system in Example 31.

[0113] Figure 65 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 32.

[0114] Figure 66 These are aberration diagrams of the zoom optical system in Example 32.

[0115] Figure 67 This is a schematic structural diagram of a camera device according to one embodiment.

[0116] Symbol Explanation

[0117] 1-Magnification optical system, 2-Filter, 3-Imaging element, 5-Signal processing unit, 6-Display unit, 7-Magnification control unit, 8-Focus control unit, 9-Anti-vibration control unit, 500-Camera device, DG1-Distance, Dsum-Distance, ED-Effective diameter, G1-First lens group, GM-Intermediate group, GM1-M1 lens group, GM2-M2 lens group, GMr-Mr lens group, GR-Subsequent group, GR1-R1 lens group, GR2-R2 lens group, GR3-R3 lens group, L11~L58, Lx-Lens, P1-Optical component, PP-Optical component, Px-Position, Sim-Image plane, St-Aperture stop, Xa-On-axis beam, Xb-Off-axis beam, Xb1-Ray, Z-Optical axis, ωt-Maximum half angle of view, ωw-Maximum half angle of view. Detailed Implementation

[0118] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0119] exist Figure 1The diagram illustrates the structure, cross-sectional view, and movement trajectory of a zoom optical system according to one embodiment of the present invention. Figure 1 In the image, the upper section labeled "Wide" shows the wide-angle end, and the lower section labeled "Tele" shows the telephoto end. Figure 1 In the diagram, the on-axis beam at the wide-angle end and the beam with the maximum half-angle view ωw are shown, along with the on-axis beam at the telephoto end and the beam with the maximum half-angle view ωt. Figure 2 The middle shows Figure 1 A cross-sectional view of the structure of the zoom optical system at the wide-angle end. Figure 1 and Figure 2 In the image, the left side is the object side, the right side is the image side, and the image is focused on an object at infinity. Figure 1 and Figure 2 The example shown corresponds to the zoom optical system of Embodiment 1 described later. Hereinafter, reference will be made primarily to... Figure 1 Provide explanations and refer to them as needed. Figure 2 .

[0120] The zoom optical system of the present invention is composed of a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR, arranged sequentially along the optical axis Z from the object side to the image side. A lens group M1 with negative refractive power GM1 is positioned closest to the object side of the intermediate lens group GM. A lens group Mr with negative refractive power GMr is positioned closest to the image side of the intermediate lens group GM. The intermediate lens group GM consists of three or fewer lens groups with refractive power, including the M1 lens group GM1 and the Mr lens group GMr. That is, the intermediate lens group GM consists of two or three lens groups with refractive power. A lens group R1 with positive refractive power GR1 is positioned closest to the object side of the subsequent lens group GR. During zooming, the first lens group is fixed relative to the image plane Sim, while the spacing between all adjacent lens groups changes. This structure facilitates the effective correction of various aberrations throughout the zoom region while achieving a high zoom ratio.

[0121] Setting the refractive power of the first lens group closest to the object to be positive facilitates miniaturization and reduces the height of the light incident on the intermediate group GM, thus helping to suppress aberration variations during zooming. The intermediate group GM, comprising two lens groups with negative refractive powers, helps to balance good aberration correction and high zoom ratios throughout the zoom range. Setting the refractive power of the lens group closest to the object to be positive in the subsequent group GR also facilitates miniaturization. Keeping the first lens group closest to the object stationary during zooming helps to suppress changes in the center of gravity during zooming.

[0122] Furthermore, in this specification, a lens group is defined as a group whose spacing in the optical axis direction changes with adjacent groups during zooming. During zooming, the spacing between adjacent lenses within a lens group remains unchanged. That is, a "lens group" is a component of the zoom optical system and includes at least one lens separated by an air gap that changes during zooming. During zooming, each lens group unit can be moved or fixed. A "lens group" may include components other than lenses that do not have refractive power, such as an aperture stop (St).

[0123] As an example, such as Figure 2 The detailed structure shown is as follows: Figure 1 The zoom optical system is configured as follows: Lens group G1 consists of five lenses, L11 to L15, arranged sequentially from the object side to the image side. The intermediate group GM consists of two lens groups, M1 (GM1) and Mr (GMr), arranged sequentially from the object side to the image side. M1 (GM1) consists of six lenses, L21 to L26, arranged sequentially from the object side to the image side. Mr (GMr) consists of two lenses, L31 to L32, arranged sequentially from the object side to the image side. The subsequent group GR consists of one lens group, R1 (GR1). R1 ​​(GR1) consists of lens L41, aperture stop St, lenses L42 to L55, optical component PP, and lenses L56 to L58, arranged sequentially from the object side to the image side. Figure 1 and Figure 2 The aperture stop St shown indicates the position along the optical axis, not its size or shape. The optical component PP is envisioned as a parallel, flat, non-refractive component, such as various filters. In the zoom optical system of the present invention, it is also possible to construct a structure that does not include the optical component PP.

[0124] exist Figure 1 In the example, during zooming, the first lens group G1 and the R1 lens group GR1 are fixed relative to the image plane Sim, while the M1 lens group GM1 and the Mr lens group GMr change their spacing and move along the optical axis Z. Figure 1 In the diagram, between the upper and lower sections, solid arrows represent the approximate movement trajectories of each lens group during zoom, from the wide-angle end to the telephoto end.

[0125] The first lens group G1 can be configured to include two joined lenses, formed by combining a negative lens and a positive lens. This configuration is advantageous for correcting chromatic aberration. Alternatively, the first lens group G1 can be configured to include one positive lens in addition to the two joined lenses. This configuration is advantageous for correcting spherical aberration.

[0126] The M1 lens group GM1 preferably includes two or more positive lenses and three or more negative lenses. This configuration helps to suppress aberrations during zooming.

[0127] The Mr lens group (GMr) can be configured as a combined lens, consisting of a negative lens and a positive lens. This configuration helps to suppress chromatic aberration during zooming.

[0128] The lens surfaces of the subsequent group GR closest to the object and the lens surfaces of the subsequent group GR closest to the image are preferably fixed relative to the image plane Sim during zooming. This configuration simplifies the mechanism.

[0129] The subsequent group GR can be configured to include an aperture stop St. This configuration facilitates the miniaturization of the subsequent group GR.

[0130] The subsequent group GR preferably includes an anti-vibration group that moves in a direction intersecting the optical axis Z during image jitter correction. By configuring the anti-vibration group in the subsequent group GR, the diameter of the anti-vibration group can be easily suppressed, thus facilitating miniaturization. In this specification, "image jitter correction" is also referred to as "vibration stabilization".

[0131] As an example, Figure 1 The vibration damping assembly of the zoom optical system consists of Figure 2 The lenses shown are L45 to L48. Figure 1 In the lower section of the diagram, brackets with downward arrows are marked below the lens that constitutes the vibration damping unit. Furthermore, the vibration damping unit functions throughout the entire zoom range, including the wide-angle end, but... Figure 1 In order to avoid complicating the diagrams, the aforementioned brackets and arrows are only shown in the lower section of the diagram. The above-described illustration method related to the vibration damping group is also the same in the diagrams of other embodiments.

[0132] A zoom optical system can be configured to include a focusing group that moves along the optical axis Z during focusing. Figure 1 In the example, the subsequent group GR includes the focus group. By configuring the focus group in the subsequent group GR, it is easy to suppress the diameter of the focus group, thus facilitating miniaturization.

[0133] As an example, Figure 1 The focusing group of the zoom optical system consists of Figure 2 The lenses shown are L52 to L55. Figure 1 In the lower section of the diagram, brackets with left-right arrows are marked below the lenses that constitute the focusing group. These arrows indicate the direction in which the focusing group moves when focusing from an object at infinity to the nearest object. Furthermore, the focusing group operates throughout the entire zoom range, including the wide-angle end, but... Figure 1 In order to avoid complicating the diagram, the aforementioned brackets and arrows are only shown in the lower section of the diagram. The above-described illustration method related to the focusing group is also the same in the diagrams of other embodiments.

[0134] Next, the preferred structure of the zoom optical system of the present invention related to the conditional expressions will be described. In the following description of the conditional expressions, to avoid redundancy, the same notation will be used for the same definition of the same part, and repeated descriptions of the notation will be omitted. Furthermore, to avoid redundancy, "the zoom optical system of the present invention" will also be simply referred to as "zoom optical system" below.

[0135] The zoom optical system preferably satisfies the following condition (1). Here, the focal length of the M1 lens group GM1 is set to fM1. The focal length of the first lens group G1 is set to f1. By ensuring that the corresponding value of condition (1) is not below the lower limit, the refractive power of the first lens group G1 can be enhanced, thus facilitating a shorter overall optical length. By ensuring that the corresponding value of condition (1) is not above the upper limit, it is beneficial to maintain the zoom effect of the M1 lens group GM1, thus facilitating a high zoom ratio. Furthermore, by ensuring that the corresponding value of condition (1) is not above the upper limit, it is beneficial to shorten the amount of movement of the M1 lens group GM1 during zooming, thus also facilitating miniaturization.

[0136] 0.05<(-fM1) / f1<0.8 (1)

[0137] To obtain better properties, the lower limit of conditional expression (1) is more preferably set to 0.08, further preferably 0.1, further preferably 0.12, further preferably 0.14, further preferably 0.16, further preferably 0.18, further preferably 0.2, further preferably 0.21, and further preferably 0.22. To obtain better properties, the upper limit of conditional expression (1) is more preferably set to 0.75, further preferably 0.7, further preferably 0.65, further preferably 0.6, further preferably 0.55, further preferably 0.5, further preferably 0.45, further preferably 0.4, and further preferably 0.35.

[0138] When the focal length of the R1 lens group GR1 is set to fR1, the zoom optical system preferably satisfies the following condition (2). By ensuring that the corresponding value of condition (2) is not below the lower limit, the refractive power of the first lens group G1 will not become too weak, thus facilitating a shorter overall optical length. By ensuring that the corresponding value of condition (2) is not above the upper limit, the refractive power of the first lens group G1 will not become too strong, thus facilitating the suppression of aberration variations during zooming.

[0139] 0.05 < fR1 / f1 < 0.85 (2)

[0140] To obtain better properties, the lower limit of condition (2) is more preferably set to 0.07, more preferably 0.09, more preferably 0.11, more preferably 0.13, more preferably 0.15, more preferably 0.16, more preferably 0.17, more preferably 0.18, and more preferably 0.185. To obtain better properties, the upper limit of condition (2) is more preferably set to 0.8, more preferably 0.75, more preferably 0.7, more preferably 0.65, more preferably 0.6, more preferably 0.55, more preferably 0.45, more preferably 0.4, and more preferably 0.35.

[0141] When the focal length of the Mr lens group GMr is set to fMr, the zoom optical system preferably satisfies the following condition (3). By ensuring that the corresponding value of condition (3) is not below the lower limit, the refractive power of the M1 lens group GM1 will not become too weak, thus making it easier to shorten the movement of the M1 lens group GM1 during zooming, which is beneficial for shortening the total optical length. By ensuring that the corresponding value of condition (3) is not above the upper limit, the refractive power of the M1 lens group GM1 will not become too strong, thus suppressing overcorrection of spherical aberration on the telephoto side, which is beneficial for obtaining high optical performance.

[0142] 0.8 < fMr / fM1 < 7 (3)

[0143] To obtain better properties, the lower limit of condition (3) is more preferably set to 0.95, further preferably 1.1, further preferably 1.25, further preferably 1.4, further preferably 1.55, further preferably 1.7, further preferably 1.8, further preferably 1.9, and further preferably 2. To obtain better properties, the upper limit of condition (3) is more preferably set to 6, further preferably 5.5, further preferably 5, further preferably 4.5, further preferably 4.25, further preferably 4, further preferably 3.75, further preferably 3.5, and further preferably 3.25.

[0144] The zoom optical system preferably satisfies the following condition (4). Here, the distance on the optical axis from the object-side surface of the first lens group to the image-side surface of the first lens group is defined as DG1. The distance on the optical axis from the object-side surface of the first lens group G1 to the image-side surface of the subsequent group GR in the state of focusing on an infinity object at the wide-angle end is defined as Dsum. As an example, in Figure 2The distances DG1 and Dsum mentioned above are shown in the figure. The distance DG1 corresponds to the thickness on the optical axis of the first lens group G1. By ensuring that the corresponding value of condition (4) is not below the lower limit, the first lens group G1 will not become too thin, which is beneficial for correcting chromatic aberration and astigmatism. By ensuring that the corresponding value of condition (4) is not above the upper limit, it is possible to suppress the weight of the first lens group G1 from becoming too large, and thus it is possible to suppress the overall weight of the optical system from becoming too large.

[0145] 0.012<DG1 / Dsum<0.25 (4)

[0146] To obtain better properties, the lower limit of condition (4) is more preferably set to 0.014, more preferably 0.016, more preferably 0.018, more preferably 0.02, more preferably 0.022, more preferably 0.024, more preferably 0.026, more preferably 0.028, and more preferably 0.03. To obtain better properties, the upper limit of condition (4) is more preferably set to 0.24, more preferably 0.23, more preferably 0.22, more preferably 0.21, more preferably 0.2, more preferably 0.19, more preferably 0.18, more preferably 0.17, and more preferably 0.16.

[0147] The zoom optical system preferably satisfies the following condition (5). Here, the focal length of the zoom optical system in the state of focusing on an object at infinity at the wide-angle end is set to fw. By ensuring that the corresponding value of condition (5) is not below the lower limit, it is beneficial to shorten the total optical length. By ensuring that the corresponding value of condition (5) is not above the upper limit, it is beneficial to ensure the angle of view at the wide-angle end.

[0148] 0.08 < fw / f1 < 0.3 (5)

[0149] To obtain better properties, the lower limit of condition (5) is more preferably set to 0.085, more preferably 0.09, more preferably 0.095, more preferably 0.1, more preferably 0.105, and more preferably 0.11. To obtain better properties, the upper limit of condition (5) is more preferably set to 0.22, more preferably 0.2, more preferably 0.18, more preferably 0.17, more preferably 0.16, and more preferably 0.15.

[0150] The zoom optical system preferably satisfies the following condition (6). By ensuring that the corresponding value of condition (6) is not below the lower limit, the negative refractive power of the M1 lens group GM1 will not become too strong, thus suppressing the large diameter of the beam incident on the intermediate group GM and the group further to the image side than the intermediate group GM, which is beneficial for miniaturization. By ensuring that the corresponding value of condition (6) is not above the upper limit, the negative refractive power of the M1 lens group GM1 will not become too weak, which is beneficial for high zoom ratio.

[0151] -3<fw / fM1<-0.2 (6)

[0152] To obtain better properties, the lower limit of condition (6) is more preferably set to -2.5, further preferably -2, further preferably -1.8, further preferably -1.6, further preferably -1.4, further preferably -1.3, further preferably -1.2, further preferably -1.1, and further preferably -1.05. To obtain better properties, the upper limit of condition (6) is more preferably set to -0.3, further preferably -0.4, further preferably -0.45, further preferably -0.5, further preferably -0.6, further preferably -0.64, further preferably -0.67, further preferably -0.7, and further preferably -0.73.

[0153] The zoom optical system preferably satisfies the following condition (7). By ensuring that the corresponding value of condition (7) is not below the lower limit, it is beneficial to suppress the variation of spherical aberration during zooming. By ensuring that the corresponding value of condition (7) is not above the upper limit, it is possible to suppress the overcorrection of spherical aberration, especially at the wide-angle end.

[0154] 0.1 < fw / fR1 < 1.4 (7)

[0155] To obtain better properties, the lower limit of condition (7) is more preferably set to 0.2, more preferably 0.25, more preferably 0.3, more preferably 0.35, more preferably 0.37, more preferably 0.39, more preferably 0.41, more preferably 0.43, and more preferably 0.45. To obtain better properties, the upper limit of condition (7) is more preferably set to 1.3, more preferably 1.2, more preferably 1.1, more preferably 1, more preferably 0.95, more preferably 0.9, more preferably 0.85, more preferably 0.83, and more preferably 0.81.

[0156] The zoom optical system preferably satisfies the following condition (8). Here, the focal length of the zoom optical system as a whole when focusing on an object at infinity at the telephoto end is set to ft. By ensuring that the corresponding value of condition (8) is not below the lower limit, the refractive power of the first lens group G1 will not become too strong, thus helping to suppress aberration changes during zooming. By ensuring that the corresponding value of condition (8) is not above the upper limit, the refractive power of the first lens group G1 will not become too weak, thus helping to shorten the total optical length.

[0157] 0.6 < f1 / (fw×ft) 1 / 2 <4 (8)

[0158] To obtain better properties, the lower limit of condition (8) is more preferably set to 0.9, more preferably 1.2, more preferably 1.4, more preferably 1.55, more preferably 1.65, and more preferably 1.75. To obtain better properties, the upper limit of condition (8) is more preferably set to 3.5, more preferably 3, more preferably 2.9, more preferably 2.8, more preferably 2.5, and more preferably 2.3.

[0159] The zoom optical system preferably satisfies the following condition (9). By ensuring that the corresponding value of condition (9) is not below the lower limit, the zoom ratio will not become too low, thus fully realizing the value of the zoom optical system. By ensuring that the corresponding value of condition (9) is not above the upper limit, the zoom ratio will not become too high, thus preventing excessive movement of the lens group, which is beneficial to the miniaturization of the overall optical system.

[0160] 9 < ft / fw < 60 (9)

[0161] To obtain better properties, the lower limit of condition (9) is more preferably set to 11, more preferably 13, more preferably 15, more preferably 17, more preferably 18, and more preferably 19. To obtain better properties, the upper limit of condition (9) is more preferably set to 50, more preferably 40, more preferably 30, more preferably 25, more preferably 22, and more preferably 20.

[0162] In the subsequent group GR, which includes a vibration-damping group that moves in a direction intersecting the optical axis Z during image jitter correction, the zoom optical system preferably satisfies the following condition (10). Here, the focal length of the vibration-damping group is set to fois. By ensuring that the corresponding value of condition (10) is not below the lower limit, the amount of movement of the vibration-damping group during image jitter correction can be suppressed, thus suppressing the overall size of the zoom optical system and the size of the vibration-damping unit (i.e., the vibration-damping group and the mechanism that moves the vibration-damping group). By ensuring that the corresponding value of condition (10) is not above the upper limit, the refractive power of the vibration-damping group will not become too strong, thus suppressing aberration variations during image jitter correction.

[0163] 0.1<fw / |fois|<1.5 (10)

[0164] To obtain better properties, the lower limit of condition (10) is more preferably set to 0.2, more preferably 0.3, more preferably 0.4, more preferably 0.5, more preferably 0.6, and more preferably 0.7. To obtain better properties, the upper limit of condition (10) is more preferably set to 1.1, more preferably 1, more preferably 0.95, more preferably 0.9, more preferably 0.85, and more preferably 0.8.

[0165] In the subsequent GR group, which includes the aforementioned anti-vibration group, the zoom optical system preferably satisfies the following condition (11). Here, the maximum half-angle view is set as ωw when focusing on an object at infinity at the wide-angle end. The maximum half-angle view is set as ωt when focusing on an object at infinity at the telephoto end. As an example, in Figure 1 The maximum half-angle of view ωw and the maximum half-angle of view ωt are shown above. Condition (11) is a formula that takes into account the movement of the imaging element disposed on the image plane Sim in a direction perpendicular to the optical axis Z for anti-vibration (i.e., image jitter correction). (fw×tanωw) / (ft×tanωt) of condition (11) corresponds to the ratio of the image circle size at the wide-angle end to the image circle size at the telephoto end. The anti-vibration correction angle is preferably kept approximately constant throughout the zoom range, so it is preferable to change the image circle size between the wide-angle end and the telephoto end as in condition (11). When the anti-vibration correction angle is set constant, the amount of movement required to move the imaging element in a direction perpendicular to the optical axis Z for anti-vibration increases proportionally to the focal length of the zoom optical system. By ensuring that the corresponding value of condition (11) does not exceed the upper limit, the image circle at the telephoto end can be made larger than the image circle at the wide-angle end, so it is particularly easy to ensure the required amount of movement within the image circle of the imaging element when performing anti-vibration at the telephoto end. By ensuring that the corresponding value of condition (11) does not fall below the lower limit, it is possible to prevent the imaging element from becoming too large.

[0166] 0.6 < (fw × tanωw) / (ft × tanωt) < 0.98 (11)

[0167] To obtain better properties, the lower limit of condition (11) is more preferably set to 0.65, more preferably 0.68, and even more preferably 0.7. To obtain better properties, the upper limit of condition (11) is more preferably set to 0.91, more preferably 0.85, and even more preferably 0.8.

[0168] The zoom optical system preferably satisfies the following condition (16). Here, the average value of the Abbe number of the d-line reference of all positive lenses in the first lens group G1 is set as ν1pave. By ensuring that the corresponding value of condition (16) is not below the lower limit, it is particularly beneficial to correct on-axis chromatic aberration at the telephoto end. By ensuring that the corresponding value of condition (16) is not above the upper limit, it is beneficial to correct aberrations other than chromatic aberration.

[0169] 70<ν1pave<97 (16)

[0170] To obtain better properties, the lower limit of condition (16) is more preferably set to 78, and even more preferably to 86. To obtain better properties, the upper limit of condition (16) is more preferably set to 95, and even more preferably to 93.

[0171] The zoom optical system preferably satisfies the following condition (20). By ensuring that the corresponding value of condition (20) is not below the lower limit, it is possible to suppress the excessively large incident angle of the off-axis principal ray toward the image plane Sim, and it is beneficial to suppress aberration variations during zooming. By ensuring that the corresponding value of condition (20) is not above the upper limit, it is beneficial to suppress spherical aberration at the telephoto end.

[0172] 0.1<(-fMr) / fR1<5 (20)

[0173] To obtain better properties, the lower limit of condition (20) is more preferably set to 0.3, more preferably 0.5, more preferably 0.7, more preferably 0.9, more preferably 1.1, and more preferably 1.3. To obtain better properties, the upper limit of condition (20) is more preferably set to 4, more preferably 3, more preferably 2.5, more preferably 2.1, more preferably 1.8, and more preferably 1.5.

[0174] The zoom optical system preferably includes at least one specific lens as described below. The specific lens is defined as a lens that satisfies the following conditions (12) and (13). Here, the refractive index of the lens included in the zoom optical system relative to the d-line is set as Nd. The Abbe number of the d-line reference of the lens included in the zoom optical system is set as νd.

[0175] 2.435<Nd+0.01425×νd<2.75 (12)

[0176] 15<νd<39 (13)

[0177] The material of a particular lens can be, for example, glass. The optical glass that satisfies conditions (12) and (13) and its manufacturing method are described on pages 40-42 of the proceedings of the 49th Optical Symposium (Conference dates: June 20-21, 2024, hosted by the Japan Optical Society).

[0178] By ensuring that the corresponding value of condition (12) is not below the lower limit, it is beneficial to perform good correction of spherical aberration and chromatic aberration. By ensuring that the corresponding value of condition (12) is not above the upper limit, it is possible to suppress the excessive difficulty in correcting image plane curvature.

[0179] To obtain better properties, the lower limit of condition (12) is more preferably set to 2.445, further preferably 2.455, further preferably 2.468, further preferably 2.48, further preferably 2.49, further preferably 2.5, further preferably 2.51, and further preferably 2.52. To obtain better properties, the upper limit of condition (12) is more preferably set to 2.74, further preferably 2.73, further preferably 2.72, further preferably 2.71, further preferably 2.7, further preferably 2.69, further preferably 2.68, and further preferably 2.67.

[0180] By ensuring that the corresponding value of condition (13) is not below the lower limit, in addition to primary achromatic correction, secondary spectrum can also be well corrected in color difference correction. By ensuring that the corresponding value of condition (13) is not above the upper limit, secondary spectrum can be corrected more reliably and effectively.

[0181] To obtain better properties, the lower limit of condition (13) is more preferably set to 15.5, further preferably 16, further preferably 16.5, further preferably 16.8, further preferably 17.1, and further preferably 17.3. To obtain better properties, the upper limit of condition (13) is more preferably set to 37, further preferably 35, further preferably 33, further preferably 32, further preferably 31, and further preferably 30.

[0182] When the partial dispersion ratio between the g-line and F-line of the lens included in the zoom optical system is set to θgF, a particular lens preferably satisfies the following condition (14).

[0183] 0.65<θgF+0.00316×νd<0.85 (14)

[0184] Furthermore, when the refractive indices of a lens relative to the g-line, F-line, and C-line are set as Ng, NF, and NC respectively, and the partial dispersion ratio between the g-line and F-line of the lens is set as θgF, θgF is defined by the following formula.

[0185] θgF = (Ng - NF) / (NF - NC)

[0186] By ensuring that the corresponding value of condition (14) is not below the lower limit, in addition to primary achromatic correction, secondary spectrum can also be well corrected in color difference correction. By ensuring that the corresponding value of condition (14) is not above the upper limit, secondary spectrum can be corrected more reliably and effectively.

[0187] To obtain better properties, the lower limit of condition (14) is more preferably set to 0.67, more preferably 0.675, more preferably 0.68, more preferably 0.683, more preferably 0.689, and more preferably 0.692. To obtain better properties, the upper limit of condition (14) is more preferably set to 0.8, more preferably 0.78, more preferably 0.76, more preferably 0.74, more preferably 0.73, and more preferably 0.725.

[0188] The intermediate group GM preferably includes at least one specific lens. This configuration helps to suppress chromatic aberration during zooming. The specific lens included in the intermediate group GM preferably satisfies the above condition (14).

[0189] In particular, the Mr lens group GMr preferably includes at least one specific lens. This configuration helps to suppress chromatic aberration during zooming. The specific lens included in the Mr lens group GMr preferably satisfies the above condition (14).

[0190] The subsequent group GR preferably includes at least one specific lens. This configuration is particularly advantageous for suppressing axial chromatic aberration. The specific lens included in the subsequent group GR preferably satisfies the above condition (14).

[0191] Preferably, the zoom optical system includes at least one joining lens, and the at least one joining lens of the zoom optical system includes a specific lens. By employing a specific lens in the lenses constituting the joining lens, it is beneficial to suppress chromatic aberration. The specific lens included in the joining lens preferably satisfies the above condition (14).

[0192] In a zoom optical system including a specific lens, the zoom optical system preferably satisfies the following condition (15). Here, the maximum effective diameter of the specific lens with the largest effective diameter among the specific lenses included in the zoom optical system is set as EDL. That is, the larger of the effective diameter of the object-side surface and the effective diameter of the image-side surface of the specific lens with the largest effective diameter is set as EDL. By ensuring that the corresponding value of condition (15) is not below the lower limit, the diameter of the specific lens will not become too small, thus making it easy to correct chromatic aberration. By ensuring that the corresponding value of condition (15) is not above the upper limit, the diameter of the specific lens will not become too large, thus suppressing the excessive difficulty in manufacturing the specific lens.

[0193] 0.1<EDL / (2×ft×tanωt)<2 (15)

[0194] To obtain better properties, the lower limit of condition (15) is more preferably set to 0.2, more preferably 0.3, more preferably 0.36, more preferably 0.39, more preferably 0.41, and more preferably 0.43. To obtain better properties, the upper limit of condition (15) is more preferably set to 1.8, more preferably 1.6, more preferably 1.4, more preferably 1.2, more preferably 1, and more preferably 0.95.

[0195] Here, for reference Figure 3 The term "effective diameter" will be explained. Figure 3 This is an illustrative diagram showing the structure within a cross-section including the optical axis Z. Figure 3 In the image, the left side is the object side, and the right side is the image side. Figure 3 The image shows the on-axis beam Xa and the off-axis beam Xb passing through lens Lx. Figure 3 In the example, the upper ray of the off-axis beam Xb, i.e., ray Xb1, is the ray that passes through the outermost edge. Here, "outer edge" refers to the radially outer edge centered on the optical axis Z, i.e., the side furthest from the optical axis Z. In this specification, twice the distance from the point Px where the outermost ray intersects with the lens surface to the optical axis Z is defined as the effective diameter ED. Furthermore, in... Figure 3 In the example, the upper ray of the off-axis beam Xb is the ray that passes through the outermost edge, but which ray becomes the ray that passes through the outermost edge depends on the optical system.

[0196] The zoom optical system of the present invention can be modified in various ways without departing from the spirit of the invention. For example, the number of lens groups included in the intermediate group GM and the number of lens groups included in the subsequent group GR can be adjusted accordingly. Figure 1 The examples differ. The number of lenses contained in each lens group, vibration damping group, and focusing group can be the same as... Figure 1The examples are different. And, in Figure 1 The example shown is a zoom lens, but the zoom optical system of the present invention can also be a variable focal length lens.

[0197] For example, the intermediate group GM can be configured as a set of three lens groups. This configuration helps to suppress aberrations during zooming.

[0198] More specifically, the intermediate group GM can be configured such that, from the object side to the image side, it consists of an M1 lens group GM1 with negative refractive power, an M2p lens group with positive refractive power, and a Mr lens group GMr with negative refractive power. In the structure of the intermediate group GM consisting of the aforementioned M1 lens group GM1, M2p lens group, and Mr lens group GMr, the zoom optical system preferably satisfies the following conditional expression (19). Here, the focal length of the M2p lens group is set to fM2p. By ensuring that the corresponding value of conditional expression (19) is not below the lower limit, it is beneficial to suppress aberration variations during zooming. By ensuring that the corresponding value of conditional expression (19) is not above the upper limit, it is beneficial to suppress spherical aberration at the telephoto end.

[0199] 0.3<fM2p / (-fMr)<5 (19)

[0200] To obtain better properties, the lower limit of condition (19) is more preferably set to 0.7, further preferably 1, further preferably 1.2, further preferably 1.4, further preferably 1.6, and further preferably 1.8. To obtain better properties, the upper limit of condition (19) is more preferably set to 4.5, further preferably 4, further preferably 3.8, further preferably 3.6, further preferably 3.4, and further preferably 3.2.

[0201] Alternatively, the intermediate group GM can be configured such that, from the object side to the image side, it consists of a lens group M1 with negative refractive power, a lens group M2n with negative refractive power, and a lens group GMr with negative refractive power. In the structure of the intermediate group GM consisting of the aforementioned lens group GM1, lens group M2n, and lens group GMr, the zoom optical system preferably satisfies the following conditional expression (21). Here, the focal length of the lens group M2n is set to fM2n. By ensuring that the corresponding value of conditional expression (21) is not below the lower limit, the negative refractive power of the lens group GM1 will not become too weak, thus facilitating a high zoom ratio. By ensuring that the corresponding value of conditional expression (21) is not above the upper limit, the negative refractive power of the lens group M2n will not become too weak, thus enabling a balanced distribution of negative refractive power between the lens groups GM1 and M2n, thereby helping to suppress aberration variations during zooming.

[0202] 1<fM2n / fM1<20 (21)

[0203] To obtain better properties, the lower limit of condition (21) is more preferably set to 1.2, more preferably 1.3, more preferably 1.4, more preferably 1.5, more preferably 1.6, and more preferably 1.7. To obtain better properties, the upper limit of condition (21) is more preferably set to 10, more preferably 7, more preferably 4, more preferably 3.5, more preferably 3.3, and more preferably 3.

[0204] The subsequent group GR can be configured to include at least one lens group with negative refractive power. In the structure where the subsequent group GR includes at least one lens group with negative refractive power, the zoom optical system preferably satisfies the following condition (17). Here, the focal length of the lens group with negative refractive power closest to the object side in the lens group with negative refractive power included in the subsequent group GR is set to fRnf. By ensuring that the corresponding value of condition (17) is not below the lower limit, it is beneficial to suppress aberration variations during zooming. By ensuring that the corresponding value of condition (17) is not above the upper limit, it is beneficial to suppress spherical aberration at the telephoto end.

[0205] 0.1<fR1 / (-fRnf)<5 (17)

[0206] To obtain better properties, the lower limit of condition (17) is more preferably set to 0.2, more preferably 0.3, more preferably 0.35, more preferably 0.4, more preferably 0.45, and more preferably 0.5. To obtain better properties, the upper limit of condition (17) is more preferably set to 4, more preferably 3, more preferably 2, more preferably 1.5, more preferably 1, and more preferably 0.8.

[0207] The subsequent group GR can be configured to include at least two lens groups with negative refractive power. In the structure where the subsequent group GR includes at least two lens groups with negative refractive power, the zoom optical system preferably satisfies the following condition (18). Here, the focal length of the lens group with negative refractive power closest to the image side in the lens group with negative refractive power included in the subsequent group GR is set to fRnr. By ensuring that the corresponding value of condition (18) is not below the lower limit, it is beneficial to prevent overcorrection of aberrations during zoom. By ensuring that the corresponding value of condition (18) is not above the upper limit, it is possible to suppress the incident angle of the off-axis principal ray toward the image plane Sim from becoming too large.

[0208] 0.01<fR1 / (-fRnr)<0.5 (18)

[0209] To obtain better properties, the lower limit of condition (18) is more preferably set to 0.012, more preferably 0.014, more preferably 0.016, more preferably 0.018, more preferably 0.02, and more preferably 0.022. To obtain better properties, the upper limit of condition (18) is more preferably set to 0.4, more preferably 0.3, more preferably 0.25, more preferably 0.2, more preferably 0.15, and more preferably 0.1.

[0210] Structures related to conditional expressions are also included. The preferred and possible structures described above can be combined arbitrarily within the scope of non-contradiction, and preferably selected appropriately according to the required specifications.

[0211] As an example, a preferred embodiment of the present invention is a zoom optical system, which consists of a first lens group G1 with positive refractive power, an intermediate group GM, and a subsequent group GR, arranged sequentially from the object side to the image side. The intermediate group GM has an M1 lens group GM1 with negative refractive power arranged on the object side and a Mr lens group GMr with negative refractive power arranged on the image side. The intermediate group GM consists of three or fewer lens groups with refractive power, including the M1 lens group GM1 and the Mr lens group GMr. The subsequent group GR has an R1 lens group GR1 with positive refractive power arranged on the object side. During zooming, the first lens group G1 is fixed relative to the image plane Sim, all the intervals of adjacent lens groups change, and the zoom optical system satisfies the above condition (1).

[0212] Next, embodiments of the zoom optical system of the present invention will be described with reference to the accompanying drawings. Furthermore, the reference numerals labeled in each group of cross-sectional views of each embodiment are used independently in each embodiment to avoid complicating the description and drawings as the number of reference numerals increases. Therefore, even if common reference numerals are used in the drawings of different embodiments, they do not necessarily represent a common structure.

[0213] [Example 1]

[0214] The structure and movement trajectory of the zoom optical system in Example 1 are shown in Figure 1 The illustrated method and structure are as described above, therefore some repetitive descriptions are omitted here. The zoom optical system of Embodiment 1, from the object side to the image side, consists of a first lens group G1 with positive refractive power, an intermediate group GM, and a subsequent group GR. The intermediate group GM, from the object side to the image side, consists of two lens groups: a lens group GM1 with negative refractive power (M1) and a lens group GMr with negative refractive power (Mr). The subsequent group GR consists of one lens group GR1 with positive refractive power (R1).

[0215] When zooming from wide-angle to telephoto, the first lens group G1 and the R1 lens group GR1 are fixed relative to the image plane Sim, while other lens groups change their spacing with adjacent lens groups and move along the optical axis Z. The image stabilization group consists of the 5th to 8th lenses from the object side in the R1 lens group GR1. The focusing group consists of the 12th to 15th lenses from the object side in the R1 lens group GR1. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0216] Regarding the zoom optical system of Example 1, the basic lens data is shown in Tables 1A and 1B, and the specifications and variable surface spacing are shown in Table 2. Here, to avoid making one table too long, the basic lens data is shown in two tables.

[0217] The basic lens data is shown in the table below. The “Sn” column shows the surface number when the surface closest to the object side is designated as surface 1, and the numbering increases sequentially towards the image side. The “R” column shows the radius of curvature of each surface. The “D” column shows the surface spacing along the optical axis of each surface and its image-side adjacent surface. The “Nd” column shows the refractive index of each component relative to the d-line. The “νd” column shows the Abbe number of each component based on the d-line. The “θgF” column shows the partial dispersion ratio between the g-line and F-line of each component. The “Material” column shows the material name and manufacturer's name of each component separated by periods. Including the tables of the embodiments described later, the manufacturer's name is shown approximated as follows: “HOYA” represents HOYA Corporation. “OHARA” represents OHARA INC. “HIKARI” represents HIKARI GLASS Co., Ltd. “SCHOTT” represents Schott AG. “SUMITA” represents SUMITA OPTICAL GLASS, Inc. “CDGM” represents Chengdu Guangming Optoelectronic Co., Ltd. “NHG” represents Hubei Xinhua Optoelectronic Information Materials Co., Ltd. The effective diameter of each facet is shown in the “ED” column.

[0218] In the table of basic lens data, the sign of the radius of curvature of the surface that makes the convex shape face the object side is set to positive, and the sign of the radius of curvature of the surface that makes the convex shape face the image side is set to negative. The surface number and the statement (St) are recorded in the surface number column corresponding to the aperture stop St. The bottom column of column D in the table contains the interval between the surface closest to the image side and the image plane Sim. Regarding the variable surface interval during zoom, the notation DD[ ] is used, and the object-side surface number of this interval is marked in [ ] and recorded in the surface interval column.

[0219] Table 2 shows the zoom ratio Zr, focal length f, back focal length Bf, open F-number FNo., maximum full angle of view 2ω, and variable plane spacing, with the d-line as the reference. When the zoom optical system is a zoom lens, the zoom ratio has the same meaning as the zoom magnification. The [°] in the 2ω column indicates that the unit is degrees. In Table 2, the values ​​for the wide-angle, middle focal length, and telephoto ends are shown in the columns labeled "Wide," "Middle," and "Tele," respectively.

[0220] In the data in each table, degrees are used as the unit of angle and millimeters as the unit of length. However, optical systems can use both magnified and reduced units, so other appropriate units can also be used. Furthermore, the tables shown below record values ​​with pre-set rounding to a predetermined number of digits.

[0221]

[0222]

[0223]

[0224] exist Figure 4 The diagram shows the aberrations of the zoom optical system of Embodiment 1 when focused on an object at infinity. Figure 4 In the middle, from left to right, are shown spherical aberration, astigmatism, distortion aberration, and magnification chromatic aberration. Figure 4 In the diagram, the upper section labeled "Wide" shows aberrations at the wide-angle end, the middle section labeled "Middle" shows aberrations at the intermediate focal length, and the lower section labeled "Tele" shows aberrations at the telephoto end. In the spherical aberration diagram, aberrations along the d-line, C-line, F-line, and g-line are shown using solid lines, long dashed lines, short dashed lines, and single-dot dashed lines, respectively. In the astigmatism diagram, aberrations along the d-line in the sagittal direction are shown using solid lines, and aberrations along the d-line in the meridional direction are shown using short dashed lines. In the distortion aberration diagram, aberrations along the d-line are shown using solid lines. In the chromatic aberration diagram, aberrations along the C-line, F-line, and g-line are shown using long dashed lines, short dashed lines, and single-dot dashed lines, respectively. In the spherical aberration diagram, the open F-value is shown after FNo.=. In other aberration diagrams, the maximum half-angle value is shown after ω=.

[0225] The notations, meanings, recording methods, and illustration methods of the data related to Embodiment 1 above are basically the same in the following embodiments unless otherwise specified, so repeated descriptions are omitted below.

[0226] [Example 2]

[0227] The structure and movement trajectory of the zoom optical system of Example 2 are shown below. Figure 5The zoom optical system of Example 2 consists of a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR, arranged sequentially from the object side to the image side. The intermediate lens group GM consists of two lens groups, M1 lens group GM1 with negative refractive power and Mr lens group GMr with negative refractive power, arranged sequentially from the object side to the image side. The subsequent lens group GR consists of one lens group, R1 lens group GR1 with positive refractive power.

[0228] When zooming from wide-angle to telephoto, the first lens group G1 and the R1 lens group GR1 are fixed relative to the image plane Sim, while other lens groups change their spacing with adjacent lens groups and move along the optical axis Z. The image stabilization group consists of three lenses from the 5th to the 7th from the object side in the R1 lens group GR1. The focusing group consists of four lenses from the 10th to the 13th from the object side in the R1 lens group GR1. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0229] Regarding the zoom optical system of Example 2, the basic lens data are shown in Tables 3A and 3B, the specifications and variable surface spacing are shown in Table 4, the aspherical coefficients are shown in Table 5, and the various aberrations are illustrated in Table 6. Figure 6 .

[0230] In the table of basic lens data, the surface numbers of aspherical surfaces are labeled. The paraxial radius of curvature is recorded in the "Radius of Curvature" column for aspherical surfaces. In Table 5, the surface number of the aspherical surface is shown in the Sn row, and the values ​​of the aspherical coefficients for each aspherical surface are shown in the KA and Am rows. Furthermore, m in Am is an integer greater than or equal to 3, and varies depending on the surface. For example, in surface 45 of Example 2, m = 4, 6, 8, 10, 12, 14, 16, 18, 20. The "E±n" (n: integer) value for the aspherical coefficients in Table 5 represents "×10" ±n KA and Am are the aspheric coefficients in the aspheric formula expressed by the following equation.

[0231] Zd=C×h 2 / {1+(1-KA×C 2 ×h 2 ) 1 / 2}+ΣAm×h m

[0232] in,

[0233] Zd: Aspherical depth (the length of the perpendicular line from a point on the aspherical surface at height h to a plane perpendicular to the optical axis Z that is in contact with the vertex of the aspherical surface)

[0234] h: Height (distance from the optical axis Z to the lens surface)

[0235] C: The reciprocal of the paraxial radius of curvature

[0236] KA, Am: These are aspherical coefficients. In the aspherical form, Σ refers to the summation related to m.

[0237] Unless otherwise specified, the methods of recording related to the aspherical surfaces described above are basically the same in the following embodiments.

[0238]

[0239]

[0240]

[0241]

[0242] [Example 3]

[0243] The structure and movement trajectory of the zoom optical system in Example 3 are shown below. Figure 7 The zoom optical system of Example 3 consists of a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR, arranged sequentially from the object side to the image side. The intermediate lens group GM consists of two lens groups, M1 lens group GM1 with negative refractive power and Mr lens group GMr with negative refractive power, arranged sequentially from the object side to the image side. The subsequent lens group GR consists of one lens group, R1 lens group GR1 with positive refractive power.

[0244] When zooming from wide-angle to telephoto, the first lens group G1 and the R1 lens group GR1 are fixed relative to the image plane Sim, while other lens groups change their spacing with adjacent lens groups and move along the optical axis Z. The image stabilization group consists of three lenses from the 5th to the 7th from the object side in the R1 lens group GR1. The focusing group consists of four lenses from the 10th to the 13th from the object side in the R1 lens group GR1. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0245] Regarding the zoom optical system of Example 3, the basic lens data are shown in Tables 6A and 6B, the specifications and variable surface spacing are shown in Table 7, and the various aberrations are illustrated in Table 6B. Figure 8 .

[0246]

[0247]

[0248]

[0249] [Example 4]

[0250] The structure and movement trajectory of the zoom optical system in Example 4 are shown below. Figure 9The zoom optical system in Example 4 consists of a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR, arranged sequentially from the object side to the image side. The intermediate lens group GM consists of two lens groups, M1 (with negative refractive power) and MMR (with negative refractive power), arranged sequentially from the object side to the image side. The subsequent lens group GR consists of one lens group, R1 (with positive refractive power).

[0251] When zooming from wide-angle to telephoto, the first lens group G1 and the R1 lens group GR1 are fixed relative to the image plane Sim, while other lens groups change their spacing with adjacent lens groups and move along the optical axis Z. The image stabilization group consists of four lenses, the 5th to 8th from the object side, in the R1 lens group GR1. The focusing group consists of three lenses, the 12th to 14th from the object side, in the R1 lens group GR1. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0252] Regarding the zoom optical system of Example 4, the basic lens data are shown in Tables 8A and 8B, the specifications and variable surface spacing are shown in Table 9, the aspherical coefficients are shown in Table 10, and the various aberrations are illustrated in Table 8B. Figure 10 .

[0253]

[0254]

[0255]

[0256]

[0257] [Example 5]

[0258] The structure and movement trajectory of the zoom optical system in Example 5 are shown below. Figure 11 The zoom optical system of Example 5 consists of a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR, arranged sequentially from the object side to the image side. The intermediate lens group GM consists of two lens groups, M1 lens group GM1 with negative refractive power and Mr lens group GMr with negative refractive power, arranged sequentially from the object side to the image side. The subsequent lens group GR consists of one lens group, R1 lens group GR1 with positive refractive power.

[0259] When zooming from wide-angle to telephoto, the first lens group G1 and the R1 lens group GR1 are fixed relative to the image plane Sim, while other lens groups change their spacing with adjacent lens groups and move along the optical axis Z. The image stabilization group consists of four lenses, the 5th to 8th from the object side, in the R1 lens group GR1. The focusing group consists of three lenses, the 12th to 14th from the object side, in the R1 lens group GR1. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0260] Regarding the zoom optical system of Example 5, the basic lens data are shown in Tables 11A and 11B, the specifications and variable surface spacing are shown in Table 12, the aspherical coefficients are shown in Table 13, and the various aberrations are illustrated in Table 14. Figure 12 .

[0261]

[0262]

[0263]

[0264]

[0265] [Example 6]

[0266] The structure and movement trajectory of the zoom optical system of Example 6 are shown below. Figure 13 The zoom optical system of Example 6 consists of a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR, arranged sequentially from the object side to the image side. The intermediate lens group GM consists of two lens groups, M1 lens group GM1 with negative refractive power and Mr lens group GMr with negative refractive power, arranged sequentially from the object side to the image side. The subsequent lens group GR consists of one lens group, R1 lens group GR1 with positive refractive power.

[0267] When zooming from wide-angle to telephoto, the first lens group G1 and the R1 lens group GR1 are fixed relative to the image plane Sim, while other lens groups change their spacing with adjacent lens groups and move along the optical axis Z. The image stabilization group consists of four lenses, the 5th to 8th from the object side, in the R1 lens group GR1. The focusing group consists of three lenses, the 12th to 14th from the object side, in the R1 lens group GR1. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0268] Regarding the zoom optical system of Example 6, the basic lens data are shown in Tables 14A and 14B, the specifications and variable surface spacing are shown in Table 15, the aspherical coefficients are shown in Table 16, and the various aberrations are illustrated in Table 14B. Figure 14 .

[0269]

[0270]

[0271]

[0272]

[0273] [Example 7]

[0274] The structure and movement trajectory of the zoom optical system of Example 7 are shown below. Figure 15 The zoom optical system of Example 7 consists of a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR, arranged sequentially from the object side to the image side. The intermediate lens group GM consists of two lens groups, M1 lens group GM1 with negative refractive power and Mr lens group GMr with negative refractive power, arranged sequentially from the object side to the image side. The subsequent lens group GR consists of one lens group, R1 lens group GR1 with positive refractive power.

[0275] When zooming from wide-angle to telephoto, the first lens group G1 and the R1 lens group GR1 are fixed relative to the image plane Sim, while other lens groups change their spacing with adjacent lens groups and move along the optical axis Z. The image stabilization group consists of four lenses, the 5th to 8th from the object side, in the R1 lens group GR1. The focusing group consists of three lenses, the 12th to 14th from the object side, in the R1 lens group GR1. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0276] Regarding the zoom optical system of Example 7, the basic lens data are shown in Tables 17A and 17B, the specifications and variable surface spacing are shown in Table 18, the aspherical coefficients are shown in Table 19, and the various aberrations are illustrated in Table 18. Figure 16 .

[0277]

[0278]

[0279]

[0280]

[0281] [Example 8]

[0282] The structure and movement trajectory of the zoom optical system of Example 8 are shown below. Figure 17 The zoom optical system of Example 8 consists of a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR, arranged sequentially from the object side to the image side. The intermediate lens group GM consists of two lens groups, M1 lens group GM1 with negative refractive power and Mr lens group GMr with negative refractive power, arranged sequentially from the object side to the image side. The subsequent lens group GR consists of one lens group, R1 lens group GR1 with positive refractive power.

[0283] When zooming from wide-angle to telephoto, the first lens group G1 and the R1 lens group GR1 are fixed relative to the image plane Sim, while other lens groups change their spacing with adjacent lens groups and move along the optical axis Z. The image stabilization group consists of four lenses, the 5th to 8th from the object side, in the R1 lens group GR1. The focusing group consists of three lenses, the 12th to 14th from the object side, in the R1 lens group GR1. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0284] Regarding the zoom optical system of Example 8, basic lens data are shown in Tables 20A and 20B, specifications and variable surface spacing are shown in Table 21, aspherical coefficients are shown in Table 22, and various aberrations are illustrated in Table 20B. Figure 18 .

[0285]

[0286]

[0287]

[0288]

[0289] [Example 9]

[0290] The structure and movement trajectory of the zoom optical system of Example 9 are shown below. Figure 19 The zoom optical system of Example 9 consists of a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR, arranged sequentially from the object side to the image side. The intermediate lens group GM consists of two lens groups, M1 lens group GM1 with negative refractive power and Mr lens group GMr with negative refractive power, arranged sequentially from the object side to the image side. The subsequent lens group GR consists of one lens group, R1 lens group GR1 with positive refractive power.

[0291] When zooming from wide-angle to telephoto, the first lens group G1 and the R1 lens group GR1 are fixed relative to the image plane Sim, while other lens groups change their spacing with adjacent lens groups and move along the optical axis Z. The image stabilization group consists of four lenses, the 5th to 8th from the object side, in the R1 lens group GR1. The focusing group consists of three lenses, the 12th to 14th from the object side, in the R1 lens group GR1. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0292] Regarding the zoom optical system of Example 9, the basic lens data are shown in Tables 23A and 23B, the specifications and variable surface spacing are shown in Table 24, the aspherical coefficients are shown in Table 25, and the various aberrations are illustrated in Table 26. Figure 20 .

[0293]

[0294]

[0295]

[0296]

[0297] [Example 10]

[0298] The structure and movement trajectory of the zoom optical system of Example 10 are shown below. Figure 21 The zoom optical system of Example 10 consists of a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR, arranged sequentially from the object side to the image side. The intermediate lens group GM consists of two lens groups, M1 lens group GM1 with negative refractive power and Mr lens group GMr with negative refractive power, arranged sequentially from the object side to the image side. The subsequent lens group GR consists of one lens group, R1 lens group GR1 with positive refractive power.

[0299] When zooming from wide-angle to telephoto, the first lens group G1 and the R1 lens group GR1 are fixed relative to the image plane Sim, while other lens groups change their spacing with adjacent lens groups and move along the optical axis Z. The image stabilization group consists of four lenses, the 5th to 8th from the object side, in the R1 lens group GR1. The focusing group consists of three lenses, the 12th to 14th from the object side, in the R1 lens group GR1. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0300] Regarding the zoom optical system of Example 10, basic lens data are shown in Tables 26A and 26B, specifications and variable surface spacing are shown in Table 27, aspherical coefficients are shown in Table 28, and various aberrations are illustrated in Table 26B. Figure 22 .

[0301] The zoom optical system of Example 10 includes a specific lens. A lens listed in the material column of the basic lens data table as "N231. Glass", "N216. Glass" or "N200. Glass" is a specific lens. The terminology related to specific lenses in this basic lens data table is the same in the embodiments described later.

[0302] The glass described on pages 40-42 of the proceedings of the 49th Optical Symposium (Conference dates: June 20-21, 2024, organized by the Japan Optical Society) can be used as “N231. Glass”, “N216. Glass”, and “N200. Glass”.

[0303]

[0304]

[0305]

[0306]

[0307] [Example 11]

[0308] The structure and movement trajectory of the zoom optical system of Example 11 are shown in... Figure 23 The zoom optical system of Example 11 consists of a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR, arranged sequentially from the object side to the image side. The intermediate lens group GM consists of two lens groups, M1 lens group GM1 with negative refractive power and Mr lens group GMr with negative refractive power, arranged sequentially from the object side to the image side. The subsequent lens group GR consists of one lens group, R1 lens group GR1 with positive refractive power.

[0309] When zooming from wide-angle to telephoto, the first lens group G1 and the R1 lens group GR1 are fixed relative to the image plane Sim, while other lens groups change their spacing with adjacent lens groups and move along the optical axis Z. The image stabilization group consists of four lenses, the 5th to 8th from the object side, in the R1 lens group GR1. The focusing group consists of three lenses, the 12th to 14th from the object side, in the R1 lens group GR1. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0310] Regarding the zoom optical system of Example 11, basic lens data are shown in Tables 29A and 29B, specifications and variable surface spacing are shown in Table 30, aspherical coefficients are shown in Table 31, and various aberrations are illustrated in Table 29B. Figure 24 .

[0311]

[0312]

[0313]

[0314]

[0315] [Example 12]

[0316] The structure and movement trajectory of the zoom optical system of Example 12 are shown below. Figure 25The zoom optical system of Example 12 consists of a first lens group G1 with positive refractive power, an intermediate group GM, and a subsequent group GR, arranged sequentially from the object side to the image side. The intermediate group GM consists of three lens groups arranged sequentially from the object side to the image side: an M1 lens group GM1 with negative refractive power, an M2 lens group GM2 with positive refractive power, and a Mr lens group GMr with negative refractive power. The M2 lens group GM2 with positive refractive power corresponds to the aforementioned M2p lens group. The subsequent group GR consists of one lens group, an R1 lens group GR1 with positive refractive power.

[0317] When zooming from wide-angle to telephoto, the first lens group G1 and the R1 lens group GR1 are fixed relative to the image plane Sim, while other lens groups change their spacing with adjacent lens groups and move along the optical axis Z. The image stabilization group consists of the 5th to 8th lenses from the object side in the R1 lens group GR1. The focusing group consists of the 12th to 15th lenses from the object side in the R1 lens group GR1. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0318] Regarding the zoom optical system of Example 12, basic lens data are shown in Tables 32A and 32B, specifications and variable surface spacing are shown in Table 33, aspherical coefficients are shown in Table 34, and various aberrations are illustrated in Table 35. Figure 26 .

[0319]

[0320]

[0321]

[0322]

[0323] [Example 13]

[0324] The structure and movement trajectory of the zoom optical system of Example 13 are shown below. Figure 27 The zoom optical system of Example 13 consists of a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR, arranged sequentially from the object side to the image side. The intermediate lens group GM consists of three lens groups arranged sequentially from the object side to the image side: a first lens group GM1 with negative refractive power, a second lens group GM2 with positive refractive power, and a third lens group GMr with negative refractive power. The second lens group GM2 with positive refractive power corresponds to the aforementioned M2p lens group. The subsequent lens group GR consists of one lens group, an R1 lens group GR1 with positive refractive power.

[0325] When zooming from wide-angle to telephoto, the first lens group G1 and the R1 lens group GR1 are fixed relative to the image plane Sim, while other lens groups change their spacing with adjacent lens groups and move along the optical axis Z. The image stabilization group consists of the 5th to 8th lenses from the object side in the R1 lens group GR1. The focusing group consists of the 12th to 15th lenses from the object side in the R1 lens group GR1. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0326] Regarding the zoom optical system of Example 13, basic lens data are shown in Tables 35A and 35B, specifications and variable surface spacing are shown in Table 36, aspherical coefficients are shown in Table 37, and various aberrations are illustrated in Table 35B. Figure 28 .

[0327]

[0328]

[0329]

[0330]

[0331] [Example 14]

[0332] The structure and movement trajectory of the zoom optical system of Example 14 are shown in... Figure 29 The zoom optical system of Example 14 consists of a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR, arranged sequentially from the object side to the image side. The intermediate lens group GM consists of three lens groups arranged sequentially from the object side to the image side: a first lens group GM1 with negative refractive power, a second lens group GM2 with positive refractive power, and a third lens group GMr with negative refractive power. The second lens group GM2 with positive refractive power corresponds to the aforementioned M2p lens group. The subsequent lens group GR consists of a single lens group, an R1 lens group GR1 with positive refractive power.

[0333] When zooming from wide-angle to telephoto, the first lens group G1 and the R1 lens group GR1 are fixed relative to the image plane Sim, while other lens groups change their spacing with adjacent lens groups and move along the optical axis Z. The image stabilization group consists of the 5th to 8th lenses from the object side in the R1 lens group GR1. The focusing group consists of the 12th to 15th lenses from the object side in the R1 lens group GR1. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0334] Regarding the zoom optical system of Example 14, basic lens data are shown in Tables 38A and 38B, specifications and variable surface spacing are shown in Table 39, aspherical coefficients are shown in Table 40, and various aberrations are illustrated in Table 38B. Figure 30 .

[0335]

[0336]

[0337]

[0338]

[0339] [Example 15]

[0340] The structure and movement trajectory of the zoom optical system of Example 15 are shown below. Figure 31 The zoom optical system of Example 15 consists of a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR, arranged sequentially from the object side to the image side. The intermediate lens group GM consists of three lens groups arranged sequentially from the object side to the image side: a first lens group GM1 with negative refractive power, a second lens group GM2 with negative refractive power, and a third lens group GMr with negative refractive power. The second lens group GM2 with negative refractive power corresponds to the aforementioned M2n lens group. The subsequent lens group GR consists of one lens group, an R1 lens group GR1 with positive refractive power.

[0341] When zooming from wide-angle to telephoto, the first lens group G1 and the R1 lens group GR1 are fixed relative to the image plane Sim, while other lens groups change their spacing with adjacent lens groups and move along the optical axis Z. The image stabilization group consists of the 5th to 8th lenses from the object side in the R1 lens group GR1. The focusing group consists of the 12th to 15th lenses from the object side in the R1 lens group GR1. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0342] Regarding the zoom optical system of Example 15, basic lens data are shown in Tables 41A and 41B, specifications and variable surface spacing are shown in Table 42, and various aberrations are illustrated in Table 41B. Figure 32 .

[0343]

[0344]

[0345]

[0346] [Example 16]

[0347] The structure and movement trajectory of the zoom optical system of Example 16 are shown in... Figure 33The zoom optical system of Example 16 consists of a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR, arranged sequentially from the object side to the image side. The intermediate lens group GM consists of three lens groups arranged sequentially from the object side to the image side: a first lens group GM1 with negative refractive power, a second lens group GM2 with negative refractive power, and a third lens group GMr with negative refractive power. The second lens group GM2 with negative refractive power corresponds to the aforementioned M2n lens group. The subsequent lens group GR consists of one lens group, an R1 lens group GR1 with positive refractive power.

[0348] When zooming from wide-angle to telephoto, the first lens group G1 and the R1 lens group GR1 are fixed relative to the image plane Sim, while other lens groups change their spacing with adjacent lens groups and move along the optical axis Z. The image stabilization group consists of the 5th to 8th lenses from the object side in the R1 lens group GR1. The focusing group consists of the 12th to 15th lenses from the object side in the R1 lens group GR1. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0349] Regarding the zoom optical system of Example 16, the basic lens data are shown in Tables 43A and 43B, the specifications and variable surface spacing are shown in Table 44, the aspherical coefficients are shown in Table 45, and the various aberrations are illustrated in Table 46. Figure 34 .

[0350]

[0351]

[0352]

[0353]

[0354] [Example 17]

[0355] The structure and movement trajectory of the zoom optical system of Example 17 are shown below. Figure 35 The zoom optical system of Example 17 consists of a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR, arranged sequentially from the object side to the image side. The intermediate lens group GM consists of three lens groups arranged sequentially from the object side to the image side: a first lens group GM1 with negative refractive power, a second lens group GM2 with negative refractive power, and a third lens group GMr with negative refractive power. The second lens group GM2 with negative refractive power corresponds to the aforementioned M2n lens group. The subsequent lens group GR consists of one lens group, an R1 lens group GR1 with positive refractive power.

[0356] When zooming from wide-angle to telephoto, the first lens group G1 and the R1 lens group GR1 are fixed relative to the image plane Sim, while other lens groups change their spacing with adjacent lens groups and move along the optical axis Z. The image stabilization group consists of the 5th to 8th lenses from the object side in the R1 lens group GR1. The focusing group consists of the 12th to 15th lenses from the object side in the R1 lens group GR1. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0357] Regarding the zoom optical system of Example 17, the basic lens data are shown in Tables 46A and 46B, the specifications and variable surface spacing are shown in Table 47, the aspherical coefficients are shown in Table 48, and the various aberrations are illustrated in Table 46B. Figure 36 .

[0358]

[0359]

[0360]

[0361]

[0362] [Example 18]

[0363] The structure and movement trajectory of the zoom optical system of Example 18 are shown below. Figure 37 The zoom optical system of Example 18 consists of a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR, arranged sequentially from the object side to the image side. The intermediate lens group GM consists of three lens groups arranged sequentially from the object side to the image side: a first lens group GM1 with negative refractive power, a second lens group GM2 with negative refractive power, and a third lens group GMr with negative refractive power. The second lens group GM2 with negative refractive power corresponds to the aforementioned M2n lens group. The subsequent lens group GR consists of one lens group, an R1 lens group GR1 with positive refractive power.

[0364] When zooming from wide-angle to telephoto, the first lens group G1 and the R1 lens group GR1 are fixed relative to the image plane Sim, while other lens groups change their spacing with adjacent lens groups and move along the optical axis Z. The image stabilization group consists of the 5th to 8th lenses from the object side in the R1 lens group GR1. The focusing group consists of the 12th to 15th lenses from the object side in the R1 lens group GR1. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0365] Regarding the zoom optical system of Example 18, basic lens data are shown in Tables 49A and 49B, specifications and variable surface spacing are shown in Table 50, and various aberrations are illustrated in... Figure 38 .

[0366]

[0367]

[0368]

[0369] [Example 19]

[0370] The structure and movement trajectory of the zoom optical system of Example 19 are shown below. Figure 39 The zoom optical system of Example 19 consists of a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR, arranged sequentially from the object side to the image side. The intermediate lens group GM consists of three lens groups arranged sequentially from the object side to the image side: a first lens group GM1 with negative refractive power, a second lens group GM2 with negative refractive power, and a third lens group GMr with negative refractive power. The second lens group GM2 with negative refractive power corresponds to the aforementioned M2n lens group. The subsequent lens group GR consists of one lens group, an R1 lens group GR1 with positive refractive power.

[0371] When zooming from wide-angle to telephoto, the first lens group G1 and the R1 lens group GR1 are fixed relative to the image plane Sim, while other lens groups change their spacing with adjacent lens groups and move along the optical axis Z. The image stabilization group consists of the 5th to 8th lenses from the object side in the R1 lens group GR1. The focusing group consists of the 12th to 15th lenses from the object side in the R1 lens group GR1. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0372] Regarding the zoom optical system of Example 19, basic lens data are shown in Tables 51A and 51B, specifications and variable surface spacing are shown in Table 52, aspherical coefficients are shown in Table 53, and various aberrations are illustrated in Table 54. Figure 40 .

[0373]

[0374]

[0375]

[0376]

[0377] [Example 20]

[0378] The structure and movement trajectory of the zoom optical system of Example 20 are shown in... Figure 41The zoom optical system of Example 20 consists of a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR, arranged sequentially from the object side to the image side. The intermediate lens group GM consists of three lens groups arranged sequentially from the object side to the image side: a first lens group GM1 with negative refractive power, a second lens group GM2 with negative refractive power, and a third lens group GMr with negative refractive power. The second lens group GM2 with negative refractive power corresponds to the aforementioned M2n lens group. The subsequent lens group GR consists of one lens group, an R1 lens group GR1 with positive refractive power.

[0379] When zooming from wide-angle to telephoto, the first lens group G1 and the R1 lens group GR1 are fixed relative to the image plane Sim, while other lens groups change their spacing with adjacent lens groups and move along the optical axis Z. The image stabilization group consists of the 5th to 8th lenses from the object side in the R1 lens group GR1. The focusing group consists of the 12th to 15th lenses from the object side in the R1 lens group GR1. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0380] Regarding the zoom optical system of Example 20, basic lens data are shown in Tables 54A and 54B, specifications and variable surface spacing are shown in Table 55, aspherical coefficients are shown in Table 56, and various aberrations are illustrated in Table 54B. Figure 42 .

[0381]

[0382]

[0383]

[0384]

[0385] [Example 21]

[0386] The structure and movement trajectory of the zoom optical system of Example 21 are shown below. Figure 43 The zoom optical system of Example 21 consists of a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR, arranged sequentially from the object side to the image side. The intermediate lens group GM consists of three lens groups arranged sequentially from the object side to the image side: a first lens group GM1 with negative refractive power, a second lens group GM2 with negative refractive power, and a third lens group GMr with negative refractive power. The second lens group GM2 with negative refractive power corresponds to the aforementioned M2n lens group. The subsequent lens group GR consists of one lens group, an R1 lens group GR1 with positive refractive power.

[0387] When zooming from wide-angle to telephoto, the first lens group G1 and the R1 lens group GR1 are fixed relative to the image plane Sim, while other lens groups change their spacing with adjacent lens groups and move along the optical axis Z. The image stabilization group consists of the 5th to 8th lenses from the object side in the R1 lens group GR1. The focusing group consists of the 12th to 15th lenses from the object side in the R1 lens group GR1. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0388] Regarding the zoom optical system of Example 21, basic lens data are shown in Tables 57A and 57B, specifications and variable surface spacing are shown in Table 58, aspherical coefficients are shown in Table 59, and various aberrations are illustrated in Table 57B. Figure 44 .

[0389]

[0390]

[0391]

[0392]

[0393] [Example 22]

[0394] The structure and movement trajectory of the zoom optical system of Example 22 are shown below. Figure 45 The zoom optical system of Example 22 consists of a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR, arranged sequentially from the object side to the image side. The intermediate lens group GM consists of three lens groups arranged sequentially from the object side to the image side: a first lens group GM1 with negative refractive power, a second lens group GM2 with negative refractive power, and a third lens group GMr with negative refractive power. The second lens group GM2 with negative refractive power corresponds to the aforementioned M2n lens group. The subsequent lens group GR consists of one lens group, an R1 lens group GR1 with positive refractive power.

[0395] When zooming from wide-angle to telephoto, the first lens group G1 and the R1 lens group GR1 are fixed relative to the image plane Sim, while other lens groups change their spacing with adjacent lens groups and move along the optical axis Z. The image stabilization group consists of the 5th to 8th lenses from the object side in the R1 lens group GR1. The focusing group consists of the 12th to 15th lenses from the object side in the R1 lens group GR1. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0396] Regarding the zoom optical system of Example 22, basic lens data are shown in Tables 60A and 60B, specifications and variable surface spacing are shown in Table 61, and various aberrations are illustrated in... Figure 46 .

[0397]

[0398]

[0399]

[0400] [Example 23]

[0401] The structure and movement trajectory of the zoom optical system of Example 23 are shown below. Figure 47 The zoom optical system of Example 23 consists of a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR, arranged sequentially from the object side to the image side. The intermediate lens group GM consists of three lens groups arranged sequentially from the object side to the image side: a first lens group GM1 with negative refractive power, a second lens group GM2 with negative refractive power, and a third lens group GMr with negative refractive power. The second lens group GM2 with negative refractive power corresponds to the aforementioned M2n lens group. The subsequent lens group GR consists of one lens group, an R1 lens group GR1 with positive refractive power.

[0402] When zooming from wide-angle to telephoto, the first lens group G1 and the R1 lens group GR1 are fixed relative to the image plane Sim, while other lens groups change their spacing with adjacent lens groups and move along the optical axis Z. The image stabilization group consists of the 5th to 8th lenses from the object side in the R1 lens group GR1. The focusing group consists of the 12th to 15th lenses from the object side in the R1 lens group GR1. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0403] Regarding the zoom optical system of Example 23, basic lens data are shown in Tables 62A and 62B, specifications and variable surface spacing are shown in Table 63, aspherical coefficients are shown in Table 64, and various aberrations are illustrated in Table 65. Figure 48 .

[0404]

[0405]

[0406]

[0407]

[0408] [Example 24]

[0409] The structure and movement trajectory of the zoom optical system of Example 24 are shown in... Figure 49The zoom optical system of Example 24 consists of a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR, arranged sequentially from the object side to the image side. The intermediate lens group GM consists of three lens groups arranged sequentially from the object side to the image side: a first lens group GM1 with negative refractive power, a second lens group GM2 with negative refractive power, and a third lens group GMr with negative refractive power. The second lens group GM2 with negative refractive power corresponds to the aforementioned M2n lens group. The subsequent lens group GR consists of one lens group, an R1 lens group GR1 with positive refractive power.

[0410] When zooming from wide-angle to telephoto, the first lens group G1 and the R1 lens group GR1 are fixed relative to the image plane Sim, while other lens groups change their spacing with adjacent lens groups and move along the optical axis Z. The image stabilization group consists of the 5th to 8th lenses from the object side in the R1 lens group GR1. The focusing group consists of the 12th to 15th lenses from the object side in the R1 lens group GR1. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0411] Regarding the zoom optical system of Example 24, basic lens data are shown in Tables 65A and 65B, specifications and variable surface spacing are shown in Table 66, aspherical coefficients are shown in Table 67, and various aberrations are illustrated in Table 65B. Figure 50 .

[0412]

[0413]

[0414]

[0415]

[0416] [Example 25]

[0417] The structure and movement trajectory of the zoom optical system of Example 25 are shown in... Figure 51 The zoom optical system of Example 25 consists of a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR, arranged sequentially from the object side to the image side. The intermediate lens group GM consists of three lens groups arranged sequentially from the object side to the image side: a first lens group GM1 with negative refractive power, a second lens group GM2 with negative refractive power, and a third lens group GMr with negative refractive power. The second lens group GM2 with negative refractive power corresponds to the aforementioned M2n lens group. The subsequent lens group GR consists of one lens group, an R1 lens group GR1 with positive refractive power.

[0418] When zooming from wide-angle to telephoto, the first lens group G1 and the R1 lens group GR1 are fixed relative to the image plane Sim, while other lens groups change their spacing with adjacent lens groups and move along the optical axis Z. The image stabilization group consists of the 4th to 7th lenses from the object side in the R1 lens group GR1. The focusing group consists of the 4th to 14th lenses from the object side in the R1 lens group GR1. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0419] Regarding the zoom optical system of Example 25, basic lens data are shown in Tables 68A and 68B, specifications and variable surface spacing are shown in Table 69, aspherical coefficients are shown in Table 70, and various aberrations are illustrated in Table 68B. Figure 52 .

[0420]

[0421]

[0422]

[0423]

[0424] [Example 26]

[0425] The structure and movement trajectory of the zoom optical system of Example 26 are shown in... Figure 53 The zoom optical system of Example 26 consists of a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR, arranged sequentially from the object side to the image side. The intermediate lens group GM consists of three lens groups arranged sequentially from the object side to the image side: a first lens group GM1 with negative refractive power, a second lens group GM2 with negative refractive power, and a third lens group GMr with negative refractive power. The second lens group GM2 with negative refractive power corresponds to the aforementioned M2n lens group. The subsequent lens group GR consists of one lens group, an R1 lens group GR1 with positive refractive power.

[0426] When zooming from wide-angle to telephoto, the first lens group G1 and the R1 lens group GR1 are fixed relative to the image plane Sim, while other lens groups change their spacing with adjacent lens groups and move along the optical axis Z. The image stabilization group consists of the 5th to 8th lenses from the object side in the R1 lens group GR1. The focusing group consists of the 12th to 15th lenses from the object side in the R1 lens group GR1. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0427] Regarding the zoom optical system of Example 26, the basic lens data are shown in Tables 71A and 71B, the specifications and variable surface spacing are shown in Table 72, the aspherical coefficients are shown in Table 73, and the various aberrations are illustrated in Table 74. Figure 54 .

[0428]

[0429]

[0430]

[0431]

[0432] [Example 27]

[0433] The structure and movement trajectory of the zoom optical system of Example 27 are shown below. Figure 55 The zoom optical system of Example 27 consists of a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR, arranged sequentially from the object side to the image side. The intermediate lens group GM consists of three lens groups arranged sequentially from the object side to the image side: a first lens group GM1 with negative refractive power, a second lens group GM2 with negative refractive power, and a third lens group GMr with negative refractive power. The second lens group GM2 with negative refractive power corresponds to the aforementioned M2n lens group. The subsequent lens group GR consists of one lens group, an R1 lens group GR1 with positive refractive power.

[0434] When zooming from wide-angle to telephoto, the first lens group G1 and the R1 lens group GR1 are fixed relative to the image plane Sim, while other lens groups change their spacing with adjacent lens groups and move along the optical axis Z. The image stabilization group consists of the 5th to 8th lenses from the object side in the R1 lens group GR1. The focusing group consists of the 12th to 15th lenses from the object side in the R1 lens group GR1. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0435] Regarding the zoom optical system of Example 27, basic lens data are shown in Tables 74A and 74B, specifications and variable surface spacing are shown in Table 75, aspherical coefficients are shown in Table 76, and various aberrations are illustrated in Table 74B. Figure 56 .

[0436]

[0437]

[0438]

[0439]

[0440] [Example 28]

[0441] The structure and movement trajectory of the zoom optical system of Example 28 are shown below. Figure 57The zoom optical system of Example 28 consists of a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR, arranged sequentially from the object side to the image side. The intermediate lens group GM consists of three lens groups arranged sequentially from the object side to the image side: a first lens group GM1 with negative refractive power, a second lens group GM2 with negative refractive power, and a third lens group GMr with negative refractive power. The second lens group GM2 with negative refractive power corresponds to the aforementioned M2n lens group. The subsequent lens group GR consists of one lens group, an R1 lens group GR1 with positive refractive power.

[0442] When zooming from wide-angle to telephoto, the first lens group G1 and the R1 lens group GR1 are fixed relative to the image plane Sim, while other lens groups change their spacing with adjacent lens groups and move along the optical axis Z. The image stabilization group consists of the 5th to 8th lenses from the object side in the R1 lens group GR1. The focusing group consists of the 12th to 15th lenses from the object side in the R1 lens group GR1. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0443] Regarding the zoom optical system of Example 28, basic lens data are shown in Tables 77A and 77B, specifications and variable surface spacing are shown in Table 78, aspherical coefficients are shown in Table 79, and various aberrations are illustrated in Table 78. Figure 58 .

[0444]

[0445]

[0446]

[0447]

[0448] [Example 29]

[0449] The structure and movement trajectory of the zoom optical system of Example 29 are shown below. Figure 59 The zoom optical system of Example 29 consists of a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR, arranged sequentially from the object side to the image side. The intermediate lens group GM consists of two lens groups, M1 lens group GM1 with negative refractive power and Mr lens group GMr with negative refractive power, arranged sequentially from the object side to the image side. The subsequent lens group GR consists of three lens groups, R1 lens group GR1 with positive refractive power, R2 lens group GR2 with negative refractive power, and R3 lens group GR3 with negative refractive power, arranged sequentially from the object side to the image side.

[0450] When zooming from wide-angle to telephoto, lens groups G1, GR1, and GR3 are fixed relative to the image plane Sim, while other lens groups move along the optical axis Z by changing their spacing from adjacent lens groups. The image stabilization group consists of the 5th to 8th lenses from the object side in lens group GR1. The focusing group consists of lens group GR2. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0451] Regarding the zoom optical system of Example 29, basic lens data are shown in Tables 80A and 80B, specifications and variable surface spacing are shown in Table 81, aspherical coefficients are shown in Table 82, and various aberrations are illustrated in Table 80B. Figure 60 .

[0452]

[0453]

[0454]

[0455]

[0456] [Example 30]

[0457] The structure and movement trajectory of the zoom optical system of Example 30 are shown in... Figure 61 The zoom optical system of Example 30 consists of, from the object side to the image side, a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR. The intermediate lens group GM consists of three lens groups from the object side to the image side: a first lens group GM1 with negative refractive power, a second lens group GM2 with negative refractive power, and a third lens group GMr with negative refractive power. The second lens group GM2 with negative refractive power corresponds to the aforementioned M2n lens group. The subsequent lens group GR consists of three lens groups from the object side to the image side: a first lens group GR1 with positive refractive power, a second lens group GR2 with negative refractive power, and a third lens group GR3 with positive refractive power.

[0458] When zooming from wide-angle to telephoto, lens groups G1, GR1, and GR3 are fixed relative to the image plane Sim, while other lens groups move along the optical axis Z by changing their spacing from adjacent lens groups. The image stabilization group consists of the 5th to 8th lenses from the object side in lens group GR1. The focusing group consists of lens group GR2. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0459] Regarding the zoom optical system of Example 30, basic lens data are shown in Tables 83A and 83B, specifications and variable surface spacing are shown in Table 84, aspherical coefficients are shown in Table 85, and various aberrations are illustrated in Table 86. Figure 62 .

[0460]

[0461]

[0462]

[0463]

[0464] [Example 31]

[0465] The structure and movement trajectory of the zoom optical system of Example 31 are shown below. Figure 63 The zoom optical system of Example 31 consists of, from the object side to the image side, a first lens group G1 with positive refractive power, an intermediate group GM, and a subsequent group GR. The intermediate group GM consists of three lens groups from the object side to the image side: an M1 lens group GM1 with negative refractive power, an M2 lens group GM2 with positive refractive power, and a Mr lens group GMr with negative refractive power. The M2 lens group GM2 with positive refractive power corresponds to the aforementioned M2p lens group. The subsequent group GR consists of three lens groups from the object side to the image side: an R1 lens group GR1 with positive refractive power, an R2 lens group GR2 with negative refractive power, and an R3 lens group GR3 with negative refractive power.

[0466] When zooming from wide-angle to telephoto, lens groups G1, GR1, and GR3 are fixed relative to the image plane Sim, while other lens groups move along the optical axis Z by changing their spacing from adjacent lens groups. The image stabilization group consists of the 5th to 8th lenses from the object side in lens group GR1. The focusing group consists of lens group GR2. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0467] Regarding the zoom optical system of Example 31, basic lens data are shown in Tables 86A and 86B, specifications and variable surface spacing are shown in Table 87, aspherical coefficients are shown in Table 88, and various aberrations are illustrated in Table 86B. Figure 64 .

[0468]

[0469]

[0470]

[0471]

[0472] [Example 32]

[0473] The structure and movement trajectory of the zoom optical system of Example 32 are shown below. Figure 65 The zoom optical system of Example 32 consists, from the object side to the image side, a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR. The intermediate lens group GM consists of two lens groups, M1 (with negative refractive power) and MMR (with negative refractive power), from the object side to the image side. The subsequent lens group GR consists of one lens group, R1 (with positive refractive power). Figure 65 The image shows an example where an optical component P1 is arranged between the subsequent group GR and the image plane Sim. The optical component P1 is envisioned as a parallel plate-shaped component without refractive power, such as various filters and / or cover glass.

[0474] When zooming from wide-angle to telephoto, the first lens group G1 and the R1 lens group GR1 are fixed relative to the image plane Sim, while other lens groups change their spacing with adjacent lens groups and move along the optical axis Z. The image stabilization group consists of the 6th to 8th lenses from the object side in the R1 lens group GR1. The focusing group consists of the 12th to 14th lenses from the object side in the R1 lens group GR1. When focusing from an infinity object to the nearest object, the focusing group moves towards the image side.

[0475] Regarding the zoom optical system of Example 32, basic lens data are shown in Tables 89A and 89B, specifications and variable surface spacing are shown in Table 90, and various aberrations are illustrated in... Figure 66 .

[0476]

[0477]

[0478]

[0479] Tables 91 to 97 show the corresponding values ​​of conditional expressions (1) to (11) and (15) to (21) for the zoom optical systems of Examples 1 to 32. Table 98 shows the corresponding values ​​of conditional expressions (12) to (14) for “N231. glass”, “N216. glass” and “N200. glass” used in the above embodiments. The corresponding values ​​of the embodiments shown in Tables 91 to 98 can also be used as upper or lower limits of the conditional expressions to set the preferred range of the conditional expressions.

[0480]

[0481]

[0482]

[0483]

[0484]

[0485]

[0486]

[0487]

[0488] The zoom optical systems of Examples 1-32 achieve a zoom ratio of 18x or higher, thus realizing a high zoom ratio. Furthermore, the zoom optical systems of Examples 1-32 effectively correct various aberrations throughout the entire zoom range, thereby maintaining high optical performance.

[0489] Next, the camera device according to the embodiments of the present invention will be described. Figure 67 The diagram shows a schematic structural diagram of a camera device 500 according to one embodiment of the present invention. Examples of camera devices 500 include surveillance cameras, film cameras, broadcast cameras, digital cameras, film cameras, video recorders, FA (Factory Automation) cameras, and MV (Machine Vision) cameras.

[0490] The imaging device 500 includes a zoom optical system 1 according to one embodiment of the present invention, a filter 2 disposed on the image side of the zoom optical system 1, and an imaging element 3 disposed on the image side of the filter 2. Additionally, in Figure 67 The diagram schematically illustrates the multiple lenses of the zoom optical system 1.

[0491] Imaging element 3 is a component that converts the optical image formed by the zoom optical system 1 into an electrical signal. For example, a CCD (Charge Coupled Device) or CMOS (Complementary Metal-Oxide Semiconductor) can be used. The imaging element 3 is configured such that its imaging plane coincides with the image plane of the zoom optical system 1.

[0492] The imaging device 500 also includes a signal processing unit 5, a display unit 6, a zoom control unit 7, a focus control unit 8, and a vibration stabilization control unit 9. The signal processing unit 5 processes the output signal from the imaging element 3. The display unit 6 displays the image formed by the signal processing unit 5. The zoom control unit 7 controls the zoom of the zoom optical system 1. The focus control unit 8 controls the focus of the zoom optical system 1. The vibration stabilization control unit 9 controls the vibration stabilization of the zoom optical system 1. Furthermore, in... Figure 67 Only one imaging element 3 is shown in the figure, but it can also be set as a so-called 3-plate camera device with 3 imaging elements.

[0493] The above description, through examples and embodiments, illustrates the technology of the present invention. However, the technology of the present invention is not limited to the above examples and embodiments, and various modifications are possible. For example, the radius of curvature, interplanar spacing, refractive index, Abbe number, and aspherical coefficient of each lens are not limited to the values ​​shown in the above embodiments, and other values ​​may be used.

[0494] The following notes further disclose the above-described implementation methods and embodiments.

[0495] [Postscript 1]

[0496] A zoom optical system comprises, from the object side to the image side, a first lens group with positive refractive power, an intermediate lens group, and subsequent lens groups, wherein...

[0497] The M1 lens group, which has negative refractive power, is positioned on the object-side closest to the middle group.

[0498] A Mr lens group with negative refractive power is disposed on the image-closest side of the middle group.

[0499] The intermediate group consists of three or fewer lens groups with refractive power, including the M1 lens group and the Mr lens group.

[0500] An R1 lens group with positive refractive power is disposed on the object-side closest to the subsequent group.

[0501] During zooming, the first lens group remains fixed relative to the image plane, while the spacing between all adjacent lens groups changes.

[0502] When the focal length of the M1 lens group is set to fM1,

[0503] When the focal length of the first lens group is set to f1...

[0504] The zoom optical system satisfies the following condition (1):

[0505] 0.05<(-fM1) / f1<0.8 (1).

[0506] [Postscript 2]

[0507] According to the zoom optical system described in Appendix 1, wherein,

[0508] When the focal length of the R1 lens group is set to fR1...

[0509] The zoom optical system satisfies the following condition (2):

[0510] 0.05<fR1 / f1<0.85 (2).

[0511] [Postscript 3]

[0512] According to the zoom optical system described in Appendix 1 or 2, wherein,

[0513] When the focal length of the Mr lens group is set to fMr...

[0514] The zoom optical system satisfies the following condition (3):

[0515] 0.8 < fMr / fM1 < 7 (3).

[0516] [Postscript 4]

[0517] According to any one of Appendices 1 to 3, the zoom optical system wherein...

[0518] Let DG1 be the distance along the optical axis from the surface of the first lens group closest to the object side to the surface of the first lens group closest to the image side.

[0519] When focusing on an object at infinity at the wide-angle end, and setting the distance on the optical axis from the surface closest to the object in the first lens group to the surface closest to the image in the subsequent lens group as Dsum,

[0520] The zoom optical system satisfies the following condition (4):

[0521] 0.012<DG1 / Dsum<0.25 (4).

[0522] [Postscript 5]

[0523] According to any one of Appendices 1 to 4, the zoom optical system wherein...

[0524] When the focal length of the zoom optical system is set to fw, with the wide-angle end focused on an object at infinity,

[0525] The zoom optical system satisfies the following condition (5):

[0526] 0.08 < fw / f1 < 0.3 (5).

[0527] [Postscript 6]

[0528] According to any one of Appendices 1 to 5, the zoom optical system wherein...

[0529] When the focal length of the zoom optical system is set to fw, with the wide-angle end focused on an object at infinity,

[0530] The zoom optical system satisfies the following condition (6):

[0531] -3<fw / fM1<-0.2 (6)。

[0532] [Postscript 7]

[0533] According to any one of Appendices 1 to 6, in the zoom optical system, wherein,

[0534] The overall focal length of the zoom optical system is set to fw when focusing on an object at infinity at the wide-angle end.

[0535] When the focal length of the R1 lens group is set to fR1...

[0536] The zoom optical system satisfies the following condition (7):

[0537] 0.1 < fw / fR1 < 1.4 (7).

[0538] [Postscript 8]

[0539] According to any one of Appendices 1 to 7, the zoom optical system wherein...

[0540] The overall focal length of the zoom optical system is set to fw when focusing on an object at infinity at the wide-angle end.

[0541] When the focal length of the zoom optical system is set to ft, with the telephoto end focused on an object at infinity,

[0542] The zoom optical system satisfies the following condition (8):

[0543] 0.6 < f1 / (fw×ft) 1 / 2 <4 (8).

[0544] [Postscript 9]

[0545] According to any one of Appendices 1 to 8, the zoom optical system wherein,

[0546] The overall focal length of the zoom optical system is set to fw when focusing on an object at infinity at the wide-angle end.

[0547] When the focal length of the zoom optical system is set to ft, with the telephoto end focused on an object at infinity,

[0548] The zoom optical system satisfies the following condition (9):

[0549] 9 < ft / fw < 60 (9).

[0550] [Postscript 10]

[0551] According to any one of Appendices 1 to 9, the zoom optical system wherein...

[0552] The subsequent group includes an anti-vibration group that moves along a direction intersecting the optical axis during image jitter correction.

[0553] The overall focal length of the zoom optical system is set to fw when focusing on an object at infinity at the wide-angle end.

[0554] When the focal length of the vibration damping group is set to fois.

[0555] The zoom optical system satisfies the following condition (10):

[0556] 0.1<fw / |fois|<1.5 (10).

[0557] [Postscript 11]

[0558] According to the zoom optical system described in Appendix 10, wherein,

[0559] The overall focal length of the zoom optical system is set to ft when focusing on an object at infinity at the telephoto end.

[0560] The maximum half-angle view when focusing on an object at infinity at the wide-angle end is set to ωw.

[0561] When the maximum half-angle of view is set to ωt when focusing on an object at infinity at the telephoto end,

[0562] The zoom optical system satisfies the following condition (11):

[0563] 0.6 < (fw × tanωw) / (ft × tanωt) < 0.98 (11).

[0564] [Postscript 12]

[0565] According to any one of Appendices 1 to 11, the zoom optical system wherein,

[0566] When the refractive index of the lens included in the zoom optical system relative to the d-line is set to Nd,

[0567] When the Abbe number of the d-line reference of the lenses included in the zoom optical system is set to νd,

[0568] The zoom optical system includes at least one specific lens that satisfies the following conditions (12) and (13):

[0569] 2.435<Nd+0.01425×νd<2.75 (12)

[0570] 15<νd<39 (13)。

[0571] [Postscript 13]

[0572] According to the zoom optical system described in Appendix 12, wherein,

[0573] When the partial dispersion ratio between the g-line and F-line of the lens included in the zoom optical system is set to θgF,

[0574] The specific lens satisfies the following conditional expression (14):

[0575] 0.65<θgF+0.00316×νd<0.85 (14).

[0576] [Postscript 14]

[0577] According to the zoom optical system described in Appendix 12 or 13, wherein,

[0578] The maximum effective diameter of the specific lens with the largest effective diameter among the specific lenses included in the zoom optical system is set as EDL.

[0579] The focal length of the zoom optical system, when focused on an object at infinity at the telephoto end, is set to ft.

[0580] When the maximum half-angle of view is set to ωt when focusing on an object at infinity at the telephoto end,

[0581] The zoom optical system satisfies the following condition (15):

[0582] 0.1<EDL / (2×ft×tanωt)<2 (15).

[0583] [Postscript 15]

[0584] According to any one of Appendices 12 to 14, the zoom optical system wherein,

[0585] The intermediate group includes at least one of the specific lenses.

[0586] [Postscript 16]

[0587] According to any one of Appendices 12 to 15, the zoom optical system wherein,

[0588] The subsequent group includes at least one of the specific lenses.

[0589] [Postscript 17]

[0590] According to any one of Appendices 12 to 16, the zoom optical system wherein,

[0591] The zoom optical system includes at least one conjoined lens.

[0592] At least one of the combined lenses of the zoom optical system includes the specific lens.

[0593] [Postscript 18]

[0594] According to any one of Appendices 1 to 17, the zoom optical system wherein...

[0595] The intermediate group consists of three lens groups.

[0596] [Postscript 19]

[0597] According to any one of Appendices 1 to 18, the zoom optical system wherein...

[0598] The M1 lens group includes two or more positive lenses and three or more negative lenses.

[0599] [Postscript 20]

[0600] A camera device comprising any one of Appendices 1 to 19, a zoom optical system.

Claims

1. A zoom optical system, comprising, from the object side to the image side, a first lens group with positive refractive power, an intermediate lens group, and subsequent lens groups, wherein, The M1 lens group, which has negative refractive power, is positioned on the object-side closest to the middle group. A Mr lens group with negative refractive power is disposed on the image-closest side of the middle group. The intermediate group consists of three or fewer lens groups with refractive power, including the M1 lens group and the Mr lens group. An R1 lens group with positive refractive power is disposed on the object-side closest to the subsequent group. During zooming, the first lens group remains fixed relative to the image plane, while the spacing between all adjacent lens groups changes. When the focal length of the M1 lens group is set to fM1, When the focal length of the first lens group is set to f1... The zoom optical system satisfies the following condition (1): 0.05<(-fM1) / f1<0.8 (1).

2. The zoom optical system according to claim 1, wherein, When the focal length of the R1 lens group is set to fR1... The zoom optical system satisfies the following condition (2): 0.05<fR1 / f1<0.85 (2).

3. The zoom optical system according to claim 1 or 2, wherein, When the focal length of the Mr lens group is set to fMr... The zoom optical system satisfies the following condition (3): 0.8 < fMr / fM1 < 7 (3).

4. The zoom optical system according to claim 1 or 2, wherein, Let DG1 be the distance along the optical axis from the surface of the first lens group closest to the object side to the surface of the first lens group closest to the image side. When focusing on an object at infinity at the wide-angle end, and setting the distance on the optical axis from the surface closest to the object in the first lens group to the surface closest to the image in the subsequent lens group as Dsum, The zoom optical system satisfies the following condition (4): 0.012<DG1 / Dsum<0.25 (4).

5. The zoom optical system according to claim 1 or 2, wherein, When the focal length of the zoom optical system is set to fw, with the wide-angle end focused on an object at infinity, The zoom optical system satisfies the following condition (5): 0.08 < fw / f1 < 0.3 (5).

6. The zoom optical system according to claim 1 or 2, wherein, When the focal length of the zoom optical system is set to fw, with the wide-angle end focused on an object at infinity, The zoom optical system satisfies the following condition (6): -3<fw / fM1<-0.2 (6)。 7. The zoom optical system according to claim 1 or 2, wherein, The overall focal length of the zoom optical system is set to fw when focusing on an object at infinity at the wide-angle end. When the focal length of the R1 lens group is set to fR1... The zoom optical system satisfies the following condition (7): 0.1 < fw / fR1 < 1.4 (7).

8. The zoom optical system according to claim 1 or 2, wherein, The overall focal length of the zoom optical system is set to fw when focusing on an object at infinity at the wide-angle end. When the focal length of the zoom optical system is set to ft, with the telephoto end focused on an object at infinity, The zoom optical system satisfies the following condition (8): 0.6<f1 / (fw×ft) 1 / 2 <4 (8).

9. The zoom optical system according to claim 1 or 2, wherein, The overall focal length of the zoom optical system is set to fw when focusing on an object at infinity at the wide-angle end. When the focal length of the zoom optical system is set to ft, with the telephoto end focused on an object at infinity, The zoom optical system satisfies the following condition (9): 9 < ft / fw < 60 (9).

10. The zoom optical system according to claim 1 or 2, wherein, The subsequent group includes an anti-vibration group that moves along a direction intersecting the optical axis during image jitter correction. The overall focal length of the zoom optical system is set to fw when focusing on an object at infinity at the wide-angle end. When the focal length of the vibration damping group is set to fois. The zoom optical system satisfies the following condition (10): 0.1<fw / |fois|<1.5 (10).

11. The zoom optical system according to claim 10, wherein, The overall focal length of the zoom optical system is set to ft when focusing on an object at infinity at the telephoto end. The maximum half-angle view when focusing on an object at infinity at the wide-angle end is set to ωw. When the maximum half-angle of view is set to ωt when focusing on an object at infinity at the telephoto end, The zoom optical system satisfies the following condition (11): 0.6 < (fw × tanωw) / (ft × tanωt) < 0.98 (11).

12. The zoom optical system according to claim 1 or 2, wherein, When the refractive index of the lens included in the zoom optical system relative to the d-line is set to Nd, When the Abbe number of the d-line reference of the lenses included in the zoom optical system is set to νd, The zoom optical system includes at least one specific lens that satisfies the following conditions (12) and (13): 2.435<Nd+0.01425×νd<2.75 (12) 15<νd<39 (13)。 13. The zoom optical system according to claim 12, wherein, When the partial dispersion ratio between the g-line and F-line of the lens included in the zoom optical system is set to θgF, The specific lens satisfies the following conditional expression (14): 0.65<θgF+0.00316×νd<0.85 (14).

14. The zoom optical system according to claim 12, wherein, The maximum effective diameter of the specific lens with the largest effective diameter among the specific lenses included in the zoom optical system is set as EDL. The focal length of the zoom optical system, when focused on an object at infinity at the telephoto end, is set to ft. When the maximum half-angle of view is set to ωt when focusing on an object at infinity at the telephoto end, The zoom optical system satisfies the following condition (15): 0.1<EDL / (2×ft×tanωt)<2 (15).

15. The zoom optical system according to claim 12, wherein, The intermediate group includes at least one of the specific lenses.

16. The zoom optical system according to claim 12, wherein, The subsequent group includes at least one of the specific lenses.

17. The zoom optical system according to claim 12, wherein, The zoom optical system includes at least one conjoined lens. At least one of the combined lenses of the zoom optical system includes the specific lens.

18. The zoom optical system according to claim 1 or 2, wherein, The intermediate group consists of three lens groups.

19. The zoom optical system according to claim 1 or 2, wherein, The M1 lens group includes two or more positive lenses and three or more negative lenses.

20. A camera device comprising the zoom optical system of any one of claims 1 to 19.

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