Optical imaging lens group, optical bayonet and endoscope

Abstract

The invention relates to an optical imaging lens group, an optical bayonet and an endoscope. The optical imaging lens group comprises a front fixing group, a zoom group and a compensation group which are arranged along the direction of an optical axis, and the zoom group is arranged between the front fixing group and the compensation group; the zoom group and the compensation group are used for changing the focal length of the optical imaging lens group under the condition of linkage along the optical axis direction; the image focal length f1 of the front fixed group under the central wavelength satisfies the image focal length f2 of the # imgabs0 # zoom group under the central wavelength satisfies the image focal length f3 of the # imgabs1 # compensation group under the central wavelength satisfies the # imgabs2 #, wherein f is the shortest focal length of the optical imaging lens group within the adjustable focal length range under the central wavelength. The optical imaging lens group is beneficial to imaging.

Description

Technical Field

[0001] The present application relates to the technical field of endoscopes, and in particular to an optical imaging lens assembly, an optical bayonet, and an endoscope. Background Art

[0002] An endoscope is a commonly used medical device that is mainly used to observe lesions in the patient's body and provide images for clinical surgery and diagnosis.

[0003] The optical bayonet is an important part of the endoscope. It is responsible for connecting the optical tube and the imaging chip, thereby transmitting the light signal detected by the optical tube to the imaging chip, and the imaging chip performs imaging based on the light signal output by the optical bayonet. The optical imaging lens group is an important part of the optical bayonet. Therefore, the design of the optical imaging lens group determines the imaging quality of the endoscope to a certain extent.

[0004] Therefore, how to design an optical imaging lens assembly that is conducive to imaging is a key research topic for people in this field. Summary of the invention

[0005] Based on this, it is necessary to provide an optical imaging lens group, an optical mount and an endoscope that can facilitate imaging in order to solve the above-mentioned technical problems.

[0006] In a first aspect, the present application provides an optical imaging lens assembly, which includes a front fixed group, a zoom group and a compensation group arranged along an optical axis, wherein the zoom group is arranged between the front fixed group and the compensation group; the zoom group and the compensation group are used to change the focal length of the optical imaging lens assembly while being linked along the optical axis;

[0007] The image focal length f1 of the front fixed group at the central wavelength satisfies

[0008] The image focal length f2 of the zoom group at the central wavelength satisfies

[0009] The image focal length f3 of the compensation group at the central wavelength satisfies Where f is the shortest focal length of the optical imaging lens assembly within the adjustable focal length range at the central wavelength.

[0010] In one embodiment, the optical imaging lens assembly further includes a rear fixing group, and the compensation group is disposed between the zoom group and the rear fixing group;

[0011] The image focal length f4 of the rear fixed lens group at the central wavelength satisfies

[0012] In one embodiment, the front fixed group includes a first front fixed lens and a second front fixed lens arranged along the optical axis;

[0013] The image focal length f of the first front fixed lens at the central wavelength 11 satisfy

[0014] The image focal length f of the second front fixed lens at the central wavelength 12 satisfy

[0015] In one embodiment, the zoom group includes a first zoom lens, a second zoom lens and a third zoom lens arranged along the optical axis;

[0016] The image focal length f of the first zoom lens at the central wavelength 21 satisfy

[0017] The image focal length f of the second zoom lens at the central wavelength 22 satisfy

[0018] The image focal length f of the third zoom lens at the central wavelength 23 satisfy

[0019] In one embodiment, the compensation group includes a first compensation lens, a second compensation lens, and a third compensation lens arranged along the optical axis;

[0020] The image focal length f of the first compensation lens at the central wavelength 31 satisfy

[0021] The image focal length f of the second compensation lens at the central wavelength 32 satisfy

[0022] The image focal length f of the third compensation lens at the central wavelength 32 satisfy

[0023] In one embodiment, the rear fixed group includes a first rear fixed lens, a second rear fixed lens and a third rear fixed lens arranged along the optical axis;

[0024] The image focal length f of the first rear fixed lens at the central wavelength 41 satisfy

[0025] The image focal length f of the second rear fixed lens at the central wavelength 42 satisfy

[0026] The image focal length f of the third rear fixed lens at the central wavelength 43 satisfy

[0027] In one embodiment, the first front fixed lens is a biconcave lens and the second front fixed lens is a rear meniscus lens.

[0028] In one embodiment, the refractive index of the first front fixed lens is 1.4 to 1.6;

[0029] The refractive index of the second front fixed lens is 1.8-2.

[0030] In one embodiment, the first variable power lens is a back meniscus lens, the second variable power lens is a back meniscus lens, and the third variable power lens is a biconvex lens;

[0031] The first variable magnification lens is glued and connected to the second variable magnification lens.

[0032] In one embodiment, the refractive index of the first variable power lens is 1.4 to 1.6;

[0033] The refractive index of the second zoom lens is 1.7 to 1.9;

[0034] The refractive index of the third variator lens is 1.4 to 1.6.

[0035] In one embodiment, the compensation group further includes a fourth compensation lens, and the third compensation lens is located between the second compensation lens and the fourth compensation lens;

[0036] The image focal length f of the fourth compensation lens at the central wavelength 34 satisfy

[0037] In one embodiment, the first compensation lens is a front meniscus lens, the second compensation lens is a biconvex lens, the third compensation lens is a rear meniscus lens, and the fourth compensation lens is a rear meniscus lens;

[0038] The first compensation lens is glued to the second compensation lens, and the third compensation lens is glued to the fourth compensation lens.

[0039] In one embodiment, the refractive index of the first compensation lens is 1.8 to 2;

[0040] The refractive index of the second compensation lens is 1.4 to 1.6;

[0041] The refractive index of the third compensation lens is 1.6 to 1.8;

[0042] The refractive index of the fourth compensation lens is 1.8-2.

[0043] In one embodiment, the first rear fixed lens is a biconvex lens, the second rear fixed lens is a rear meniscus lens, and the third rear fixed lens is a biconcave lens.

[0044] In one embodiment, the refractive index of the first rear fixed lens is 1.5 to 1.7;

[0045] The refractive index of the second rear fixed lens is 1.6 to 1.8;

[0046] The refractive index of the third rear fixed lens is 1.7-1.9.

[0047] In one embodiment, the front fixed group includes a first front fixed lens and a second front fixed lens arranged along the optical axis;

[0048] The zoom group includes a first zoom lens, a second zoom lens and a third zoom lens arranged along the optical axis;

[0049] The compensation group includes a first compensation lens, a second compensation lens, a third compensation lens and a fourth compensation lens arranged along the optical axis direction;

[0050] The rear fixed group includes a first rear fixed lens, a second rear fixed lens and a third rear fixed lens arranged along the optical axis direction.

[0051] In one embodiment, the first front fixed lens is a rear meniscus lens, and the second front fixed lens is a front meniscus lens;

[0052] The first front fixed lens is glued and connected to the second front fixed lens.

[0053] In one embodiment, the refractive index of the first front fixed lens is 1.8 to 2;

[0054] The refractive index of the second front fixed lens is 1.4-1.6.

[0055] In one embodiment, the first variable magnification lens is a front meniscus lens, the second variable magnification lens is a rear meniscus lens, and the third variable magnification lens is a biconvex lens;

[0056] The first variable magnification lens and the second variable magnification lens are glued and connected.

[0057] In one embodiment, the refractive index of the first variable power lens is 1.4 to 1.7;

[0058] The refractive index of the second variable power lens is 1.7 to 2;

[0059] The refractive index of the third variator lens is 1.4 to 1.6.

[0060] In one embodiment, the first compensation lens is a biconvex lens, the second compensation lens is a biconvex lens, and the third compensation lens is a biconcave lens.

[0061] In one embodiment, the refractive index of the first compensation lens is 1.4 to 1.6;

[0062] The refractive index of the second compensation lens is 1.4 to 1.6;

[0063] The refractive index of the third compensation lens is 1.7-2.

[0064] In one embodiment, the first rear fixed lens is a front meniscus lens, the second rear fixed lens is a biconvex lens, and the third rear fixed lens is a front meniscus lens;

[0065] The first rear fixed lens is glued and connected to the second rear fixed lens.

[0066] In one embodiment, the refractive index of the first rear fixed lens is 1.7 to 2;

[0067] The refractive index of the second rear fixed lens is 1.4 to 1.6;

[0068] The refractive index of the third rear fixed lens is 1.75-1.95.

[0069] In one embodiment, the front fixed group includes a first front fixed lens and a second front fixed lens arranged along the optical axis;

[0070] The zoom group includes a first zoom lens, a second zoom lens and a third zoom lens arranged along the optical axis;

[0071] The compensation group includes a first compensation lens, a second compensation lens and a third compensation lens arranged along the optical axis direction;

[0072] The rear fixed group includes a first rear fixed lens, a second rear fixed lens and a third rear fixed lens arranged along the optical axis direction.

[0073] In one embodiment, the optical imaging lens group further includes an aperture surface, which coincides with the front surface of the front fixed group.

[0074] In a second aspect, the present application further provides an optical mount, which includes an imaging chip and an optical imaging lens assembly as described above, wherein the imaging chip is arranged behind the optical imaging lens assembly along the optical axis.

[0075] In a third aspect, the present application also provides an endoscope, which includes any of the optical mounts described above.

[0076] The optical imaging lens group, optical bayonet and endoscope, the optical imaging lens group includes a front fixed group, a zoom group and a compensation group arranged along the optical axis, and the zoom group is arranged between the front fixed group and the compensation group. Since the zoom group and the compensation group can change the focal length of the optical imaging lens group in a linkage along the optical axis, the optical imaging lens group can achieve a zoom function more accurately. In addition, since the image side focal length f1 of the front fixed group at the central wavelength satisfies The image focal length f2 of the zoom group at the central wavelength satisfies The image focal length f3 of the compensation group at the central wavelength satisfies f is the shortest focal length of the optical imaging lens assembly within the adjustable focal length range at the central wavelength. Therefore, the components in the optical imaging lens assembly provided in this embodiment can cooperate with each other, which is beneficial to imaging and improves imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0077] Figure 1 This is a schematic diagram of the structure of an optical imaging lens assembly in an embodiment of the present application;

[0078] Figure 2 This is a schematic structural diagram of another optical imaging lens assembly in an embodiment of the present application;

[0079] Figure 3 This is a schematic structural diagram of a front fixing group in an embodiment of the present application;

[0080] Figure 4 This is a schematic diagram of the structure of a zoom group in an embodiment of the present application;

[0081] Figure 5 This is a schematic diagram of the structure of a compensation group in an embodiment of the present application;

[0082] Figure 6 This is a schematic structural diagram of a rear fixing group in an embodiment of the present application;

[0083] Figure 7 This is a schematic diagram of the structure of another front fixing group in an embodiment of the present application;

[0084] Figure 8 This is a schematic diagram of the structure of another zoom group in the embodiment of the present application;

[0085] Fig. 9 This is a schematic diagram of the structure of another compensation group in an embodiment of the present application;

[0086] Fig.10 A schematic diagram of the structure of another compensation group in an embodiment of the present application;

[0087] Fig.11 This is a schematic structural diagram of another rear fixation group in an embodiment of the present application;

[0088] Fig.12 This is a schematic structural diagram of another optical imaging lens assembly in an embodiment of the present application;

[0089] Fig.13 This is a schematic diagram of the structure of another front fixing group in an embodiment of the present application;

[0090] Fig.14 This is a schematic diagram of the structure of another zoom group in the embodiment of the present application;

[0091] Fig.15 This is a schematic diagram of the structure of another compensation group in an embodiment of the present application;

[0092] Fig.16 This is a schematic structural diagram of another rear fixation group in an embodiment of the present application;

[0093] Fig.17 This is a schematic structural diagram of another optical imaging lens assembly in an embodiment of the present application;

[0094] Fig.18 is a schematic structural diagram of an optical mount in an embodiment of the present application;

[0095] Fig.19 This is a schematic diagram of the structure of an endoscope in an embodiment of the present application;

[0096] Fig. 20 A moving curve diagram in an embodiment of the present application;

[0097] Fig.21 This is an MTF curve diagram in an embodiment of the present application;

[0098] Fig. 22 This is a schematic diagram of field curvature and distortion in an embodiment of the present application;

[0099] Fig.23 This is another MTF curve diagram in the embodiment of the present application;

[0100] Fig.24 This is another schematic diagram of field curvature and distortion in an embodiment of the present application.

[0101] Description of reference numerals:

[0102] 100-optical imaging lens group, 101-front fixed group, 102-zooming group, 103-compensation group, 201-rear fixed group, 301-first front fixed lens, 302-second front fixed lens, 401-first zooming lens, 402-second zooming lens, 403-third zooming lens, 501-first compensation lens, 502-second compensation lens, 503-third compensation lens, 601-first rear fixed lens, 602-second rear fixed lens, 603-third rear fixed lens, 901-fourth compensation lens, 1800-optical mount, 1801-imaging chip, 1900-endoscope. DETAILED DESCRIPTION

[0103] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0104] Figure 1 FIG. 1 is a schematic diagram of the structure of an optical imaging lens assembly according to an embodiment of the present application. Figure 1 As shown, the optical imaging lens assembly 100 includes a front fixed group 101, a zoom group 102 and a compensation group 103 arranged along the optical axis. That is, the zoom group 102 is arranged between the front fixed group 101 and the compensation group 103 along the optical axis. The optical axis direction can be understood as the propagation direction of light. Figure 1 For example, light enters the optical imaging lens group from left to right, that is, the light enters from the front fixed group 101 to the zoom group 102 and then reaches the compensation group 103.

[0105] The zoom group 102 can change the magnification of the optical imaging lens group 100 during the movement, and the magnification is positively correlated with the distance between the zoom group 102 and the front fixed group 101. When the zoom group 102 moves linearly along the optical axis, the focal length and image plane position of the optical imaging lens group 100 will change. In order to ensure the stability of the image plane, the compensation group 201 needs to be linked with the zoom group 102 to change the focal length of the optical imaging lens group 100 on the basis of maintaining the stability of the image plane, thereby improving the zoom accuracy.

[0106] In one embodiment, optionally, the relative positions of the zoom lens group and the compensation lens group in the optical imaging lens group 100 are moved by mechanical compensation to achieve continuous change of the focal length of the optical imaging lens group 100. Exemplarily, the focal length change range of the optical imaging lens group 100 can be 15 mm (millimeter) to 30 mm.

[0107] In this way, the zoom group 102 and the compensation group 103 can be linked together along the optical axis to change the focal length of the optical imaging lens assembly 100 .

[0108] Furthermore, the image-side focal length f1 of the front fixed group 101 at the central wavelength satisfies The image-side focal length f2 of the zoom group 102 at the central wavelength satisfies The image focal length f3 of the compensation group 103 at the central wavelength satisfies

[0109] Where f is the shortest focal length of the optical imaging lens assembly 100 within the adjustable focal length range at the center wavelength. For example, assuming that the working wavelength is within the range of 0.44um-0.85um and the center wavelength is 0.56um. The focal length of the optical imaging lens assembly 100 can be within the range of 15mm-30mm, with a long focal length of 30mm, a medium focal length of 22.22mm, and a short focal length of 15mm. The shortest focal length within the adjustable focal length range is 15mm, i.e., f=15mm.

[0110] Further optionally, the image-side focal length f1 of the front fixed group 101 at the central wavelength satisfies The image-side focal length f2 of the zoom group 102 at the central wavelength satisfies The image focal length f3 of the compensation group 103 at the central wavelength satisfies

[0111] The optical imaging lens assembly 100 provided in this embodiment includes a front fixed group 101, a zoom group 102 and a compensation group 103 arranged along the optical axis, and the zoom group 102 is arranged between the front fixed group 101 and the compensation group 103. Since the zoom group 102 and the compensation group 103 can change the focal length of the optical imaging lens assembly 100 in a linked manner along the optical axis, the optical imaging lens assembly 100 can achieve a zoom function more accurately. In addition, since the image side focal length f1 of the front fixed group 101 at the central wavelength satisfies The image-side focal length f2 of the zoom group 102 at the central wavelength satisfies The image focal length f3 of the compensation group 103 at the central wavelength satisfies f is the shortest focal length of the optical imaging lens assembly 100 within the adjustable focal length range at the central wavelength. Therefore, the components in the optical imaging lens assembly 100 provided in this embodiment can cooperate with each other, which is beneficial to imaging and improves imaging quality.

[0112] Figure 2 FIG. 1 is a schematic diagram of the structure of another optical imaging lens assembly in an embodiment of the present application. Figure 2 As shown, in one embodiment, optionally, the optical imaging lens assembly 100 further includes a rear fixed group 201, and the compensation group 103 is disposed between the zoom group 102 and the rear fixed group 201. That is, the front fixed group 101, the zoom group 102, the compensation group 103 and the fixed group 201 can be arranged in sequence along the optical axis direction.

[0113] Among them, the image focal length f4 of the rear fixed lens group at the central wavelength satisfies Optionally, the image-side focal length f4 of the rear fixed lens group at the central wavelength satisfies

[0114] The optical imaging lens assembly 100 of this embodiment further includes a rear fixed group 201. The compensation group 103 is disposed between the zoom group 102 and the rear fixed group 201. Since the image focal length f4 of the rear fixed group 201 at the central wavelength satisfies Therefore, the rear fixing group 201 can cooperate with other components to further stabilize the image plane, so as to improve the imaging quality of the optical imaging lens assembly 100 .

[0115] Figure 3 Schematic diagram of the structure of a front fixing group in an embodiment of the present application, such as Figure 3As shown, in one embodiment, optionally, the front fixed group 101 includes a first front fixed lens 301 and a second front fixed lens 302 arranged along the optical axis direction.

[0116] The image focal length f of the first front fixed lens 301 at the central wavelength is 11 satisfy The image focal length f of the second front fixed lens 302 at the central wavelength 12 satisfy

[0117] Further optionally, the image-side focal length f of the first front fixed lens 301 at the central wavelength is 11 Can satisfy The image focal length f of the second front fixed lens 302 at the central wavelength 12 Can satisfy

[0118] In this embodiment, the front fixed group 101 includes a first front fixed lens 301 and a second front fixed lens 302 arranged along the optical axis, and the image side focal length f of the first front fixed lens 301 at the central wavelength is 11 satisfy The image focal length f of the second front fixed lens 302 at the central wavelength 12 satisfy Therefore, the image focal length f1 of the front fixed group 101 at the central wavelength can satisfy And, since f 11 is a negative value, f 12 is a positive value, so the first front fixed lens 301 is a lens with negative optical power, and the second front fixed lens 302 is a lens with positive optical power. Furthermore, the combination of the first front fixed lens 301 with negative optical power and the second front fixed lens 302 with positive optical power is beneficial to reducing astigmatism, field curvature, chromatic aberration and spherical aberration, and improving the imaging quality of the optical imaging lens assembly.

[0119] Figure 4 Schematic diagram of the structure of a zoom group in the embodiment of the present application. Figure 4 As shown, in one embodiment, optionally, the zoom group 102 includes a first zoom lens 401, a second zoom lens 402, and a third zoom lens 403 arranged along the optical axis.

[0120] The image focal length f of the first variable magnification lens 401 at the central wavelength is 21 satisfy The image focal length f of the second variable magnification lens 402 at the central wavelength 22 satisfy The image-side focal length f of the third variable magnification lens 403 at the central wavelength 23satisfy

[0121] Further optionally, the image-side focal length f of the first variable magnification lens 401 at the central wavelength is 21 Can satisfy The image focal length f of the second variable magnification lens 402 at the central wavelength 22 Can satisfy The image-side focal length f of the third variable magnification lens 403 at the central wavelength 23 Can satisfy

[0122] In this embodiment, the zoom group 102 includes a first zoom lens 401, a second zoom lens 402, and a third zoom lens 403 arranged along the optical axis, and the image side focal length f of the first zoom lens 401 at the central wavelength is 21 satisfy The image focal length f of the second variable magnification lens 402 at the central wavelength 22 satisfy The image-side focal length f of the third variable magnification lens 403 at the central wavelength 23 satisfy Therefore, the image focal length f2 of the zoom group 102 at the central wavelength can satisfy And, since f 21 is a negative value, f 22 and f 23 is a positive value, so the first zoom lens 401 is a lens with negative optical focal length, and the second zoom lens 402 and the third zoom lens 403 are lenses with positive optical focal length. Furthermore, by using the first zoom lens 401 with negative optical focal length and the third zoom lens 403 with positive optical focal length, astigmatism and field curvature can be eliminated, and by using the third zoom lens 403, the ability of the zoom group 102 to clearly focus light can be improved, thereby improving the imaging quality of the optical imaging lens group.

[0123] Figure 5 Schematic diagram of the structure of a compensation group in the embodiment of the present application. Figure 5 As shown, in one embodiment, optionally, the compensation group 103 includes a first compensation lens 501, a second compensation lens 502 and a third compensation lens 503 arranged along the optical axis.

[0124] The image focal length f of the first compensation lens 501 at the central wavelength is 31 satisfy The image focal length f of the second compensation lens 502 at the central wavelength 32 satisfy The image focal length f of the third compensation lens 503 at the central wavelength is 32 satisfy

[0125] Further optionally, the image-side focal length f of the first compensation lens 501 at the central wavelength is 31 Can satisfy The image focal length f of the second compensation lens 502 at the central wavelength 32 Can satisfy The image focal length f of the third compensation lens 503 at the central wavelength is 32 Can satisfy

[0126] In this embodiment, the compensation group 103 includes a first compensation lens 501, a second compensation lens 502, and a third compensation lens 503 arranged along the optical axis, and the image focal length f of the first compensation lens 501 at the central wavelength is 31 satisfy The image focal length f of the second compensation lens 502 at the central wavelength 32 satisfy The image focal length f of the third compensation lens 503 at the central wavelength is 32 satisfy Therefore, the image focal length f3 of the compensation group 103 at the central wavelength can satisfy Similarly, the use of the first compensation lens 501 can improve the ability of the compensation group 103 to clearly focus light and reduce pixels and field curvature. The use of the second compensation lens 502 and the third compensation lens 503 can further reduce astigmatism and field curvature, and reduce chromatic aberration and spherical aberration.

[0127] Figure 6 Schematic diagram of the structure of a rear fixing group in the embodiment of the present application. Figure 6 As shown, in one embodiment, optionally, the rear fixed group includes a first rear fixed lens, a second rear fixed lens and a third rear fixed lens arranged along the optical axis direction.

[0128] The image focal length f of the first rear fixed lens 601 at the central wavelength is 41 satisfy The image focal length f of the second rear fixed lens 602 at the central wavelength 42 satisfy The image focal length f of the third rear fixed lens 603 at the central wavelength 43 satisfy

[0129] Further optionally, the image-side focal length f of the first rear fixed lens 601 at the central wavelength is 41 Can satisfy The image focal length f of the second rear fixed lens 602 at the central wavelength 42 Can satisfy The image focal length f of the third rear fixed lens 603 at the central wavelength43 Can satisfy

[0130] In this embodiment, the rear fixed group 201 includes a first rear fixed lens 601, a second rear fixed lens 602 and a third rear fixed lens 603 arranged along the optical axis, and the image side focal length f of the first rear fixed lens 601 at the central wavelength is 41 satisfy The image focal length f of the second rear fixed lens 602 at the central wavelength 42 satisfy The image focal length f of the third rear fixed lens 603 at the central wavelength 43 satisfy Therefore, the image focal length f4 of the rear fixed group 201 at the central wavelength can satisfy Similarly, since the rear fixed group 201 includes both lenses with negative optical power and lenses with positive optical power, it is beneficial for the rear fixed group 201 to reduce astigmatism, field curvature, chromatic aberration and spherical aberration.

[0131] The following describes the optional shapes and parameters of each lens in the optical imaging lens assembly.

[0132] Figure 7 FIG. 1 is a schematic diagram of the structure of another front fixing group in an embodiment of the present application. Figure 7 As shown, the first front fixed lens 301 is a biconcave lens, and the second front fixed lens 302 is a rear meniscus lens.

[0133] That is to say, the front fixed group 101 can arrange a double concave lens with negative optical focal length and a rear meniscus lens with positive optical focal length in sequence along the optical axis direction. In this way, after the light passes through the double concave lens with negative optical focal length and the rear meniscus lens with positive optical focal length in sequence, the astigmatism, field curvature, chromatic aberration and spherical aberration can be reduced, which is beneficial to the imaging of the front fixed group 101.

[0134] Please continue to refer to Figure 7 In one embodiment, optionally, the refractive index of the first front fixed lens 301 is 1.4-1.6; the refractive index of the second front fixed lens 302 is 1.8-2. In this way, a biconcave lens with positive focal power and a rear meniscus lens with negative focal power can be realized, and the image focal length f of the first front fixed lens at the central wavelength is 11 satisfy The image focal length f of the second front fixed lens at the central wavelength 12 satisfy Among them, the refractive index of 1.2 to 1.8 means that the refractive index is greater than or equal to 1.2 and less than or equal to 1.8, and other principles are the same and will not be repeated here.

[0135] Figure 8FIG. 1 is a schematic diagram of the structure of another zoom group in the embodiment of the present application. Figure 8 As shown, in one embodiment, optionally, the first variator lens 401 is a rear meniscus lens, the second variator lens 402 is a rear meniscus lens, and the third variator lens 403 is a double convex lens; the first variator lens 401 and the second variator lens 402 are glued together.

[0136] That is to say, the zoom group 102 can sequentially arrange a cemented lens consisting of a back meniscus lens with negative optical power and a back meniscus lens with positive optical power, and a biconvex lens with positive optical power along the optical axis direction. Among them, cementing the first zoom lens 401 with negative optical power and the second zoom lens 402 with positive optical power together helps to correct chromatic aberration and spherical aberration, thereby improving the imaging quality of the zoom group 102.

[0137] In one embodiment, optionally, the refractive index of the first zoom lens 401 is 1.4 to 1.6; the refractive index of the second zoom lens 402 is 1.7 to 1.9; and the refractive index of the third zoom lens 403 is 1.4 to 1.6. In this way, a back meniscus lens with negative optical power, a back meniscus lens with positive optical power, and a biconvex lens with positive optical power can be realized, and the image focal length f of the first zoom lens at the central wavelength is 21 satisfy The image focal length f of the second zoom lens at the central wavelength 22 satisfy The image focal length f of the third zoom lens at the central wavelength 23 satisfy To improve the imaging quality of the zoom group 102.

[0138] Fig. 9 FIG. 1 is a schematic diagram of the structure of another compensation group in an embodiment of the present application. Fig. 9 As shown, in one embodiment, optionally, the compensation group 103 further includes a fourth compensation lens 901, and the third compensation lens 503 is located between the second compensation lens 502 and the fourth compensation lens 901. The image focal length f of the fourth compensation lens 901 at the central wavelength is 34 satisfy

[0139] Further optionally, the image-side focal length f of the fourth compensation lens 901 at the central wavelength is 34 Can satisfy

[0140] In this embodiment, since the compensation group 103 further includes the fourth compensation lens 901, the third compensation lens 503 is located between the second compensation lens 502 and the fourth compensation lens 901, and the image-side focal length f of the fourth compensation lens 901 at the central wavelength is 34satisfy Therefore, the compensation group 103 can sequentially arrange two lenses with positive optical power and two lenses with negative optical power along the optical axis direction, which helps to improve the imaging quality.

[0141] Fig.10 A schematic diagram of the structure of another compensation group in the embodiment of the present application is as follows: Fig.10 As described, in one embodiment, further optionally, the first compensation lens 501 is a front meniscus lens, the second compensation lens 502 is a double convex lens, the third compensation lens 503 is a rear meniscus lens, and the fourth compensation lens 901 is a rear meniscus lens; the first compensation lens 501 is glued to the second compensation lens 502, and the third compensation lens 503 is glued to the fourth compensation lens 901.

[0142] That is to say, the compensation group 103 can sequentially arrange a cemented lens consisting of a front meniscus lens with positive focal power and a biconvex lens with positive focal power, and a cemented lens consisting of two rear meniscus lenses with negative focal power along the optical axis direction. Gluing the first compensation lens 501 with positive focal power and the first compensation lens 501, and gluing the third compensation lens 503 with negative focal power and the fourth compensation lens 901 together can help correct chromatic aberration and spherical aberration. In this way, light will pass through two cemented lenses in the zoom group 102, which can improve the imaging quality of the zoom group 102.

[0143] In one embodiment, optionally, the refractive index of the first compensation lens 501 is 1.8-2; the refractive index of the second compensation lens 502 is 1.4-1.6; the refractive index of the third compensation lens 503 is 1.6-1.8; and the refractive index of the fourth compensation lens 901 is 1.8-2. In this way, a front meniscus lens with positive focal power, a biconvex lens with positive focal power, and a rear meniscus lens with negative focal power can be realized, and the image focal length of the compensation group 103 at the central wavelength meets the above requirements.

[0144] Fig.11 FIG. 1 is a schematic diagram of the structure of another rear fixing group in an embodiment of the present application. Fig.11 As shown, in one embodiment, optionally, the first rear fixed lens 601 is a biconvex lens, the second rear fixed lens 602 is a rear meniscus lens, and the third rear fixed lens 603 is a biconcave lens.

[0145] That is, the rear fixed group 201 can sequentially arrange a biconvex lens with positive optical power, a rear meniscus lens with positive optical power, and a biconcave lens with negative optical power along the optical axis. Similarly, combining a lens with positive optical power and a lens with negative optical power is beneficial to the imaging of the rear fixed group 201.

[0146] In one embodiment, optionally, the refractive index of the first rear fixed lens 601 is 1.5 to 1.7; the refractive index of the second rear fixed lens 602 is 1.6 to 1.8; and the refractive index of the third rear fixed lens 603 is 1.7 to 1.9. In this way, a biconvex lens with positive focal power, a rear meniscus lens with positive focal power, and a biconcave lens with negative focal power are realized, and the image-side focal length of the front fixed group 201 at the central wavelength meets the above requirements.

[0147] Fig.12 FIG. 1 is a schematic diagram of the structure of another optical imaging lens assembly in an embodiment of the present application. Fig.12 As shown, in one embodiment, the front fixed group 101 includes a first front fixed lens 301 and a second front fixed lens 302 arranged along the optical axis; the zoom group 102 includes a first zoom lens 401, a second zoom lens 402 and a third zoom lens 403 arranged along the optical axis; the compensation group 103 includes a first compensation lens 501, a second compensation lens 502, a third compensation lens 503 and a fourth compensation lens 901 arranged along the optical axis; the rear fixed group 201 includes a first rear fixed lens 601, a second rear fixed lens 602 and a third rear fixed lens 603 arranged along the optical axis.

[0148] The first front fixed lens 301 is a biconcave lens, and the second front fixed lens 302 is a rear meniscus lens. The refractive index of the first front fixed lens 301 may be 1.57; and the refractive index of the second front fixed lens 302 may be 1.88.

[0149] The first variator lens 401 is a meniscus lens, the second variator lens 402 is a meniscus lens, and the third variator lens 403 is a biconvex lens; the first variator lens 401 is glued to the second variator lens 402. The refractive index of the first variator lens 401 may be 1.47; the refractive index of the second variator lens 402 may be 1.76; and the refractive index of the third variator lens 403 may be 1.6.

[0150] The first compensating lens 501 is a front meniscus lens, the second compensating lens 502 is a biconvex lens, the third compensating lens 503 is a rear meniscus lens, and the fourth compensating lens 901 is a rear meniscus lens; the first compensating lens 501 is glued to the second compensating lens 502, and the third compensating lens 503 is glued to the fourth compensating lens 901. The refractive index of the first compensating lens 501 may be 1.89; the refractive index of the second compensating lens 502 may be 1.46; the refractive index of the third compensating lens 503 may be 1.7; and the refractive index of the fourth compensating lens 901 may be 1.83.

[0151] The first rear fixed lens 601 is a biconvex lens, the second rear fixed lens 602 is a rear meniscus lens, and the third rear fixed lens 603 is a biconcave lens. The refractive index of the first rear fixed lens 601 may be 1.67; the refractive index of the second rear fixed lens 602 may be 1.78; and the refractive index of the third rear fixed lens 603 may be 1.71.

[0152] Furthermore, by changing the relative positions of the zoom group 102 and the compensation group 103 , that is, in the process of linkage between the zoom group 102 and the compensation group 103 , the zoom of the optical imaging lens group is also achieved. Fig.12 The structure diagram of the optical imaging lens assembly 100 at long focus, medium focus and short focus is shown. In this way, since the four components can reduce astigmatism, field curvature, chromatic aberration and spherical aberration, Fig.12 The optical imaging lens assembly 100 shown can improve the imaging quality and facilitate imaging.

[0153] In some embodiments, the optical imaging lens assembly may also adopt other shapes and parameters. The following introduces another optical imaging lens assembly with another shape and parameters.

[0154] Fig.13 FIG. 1 is a schematic diagram of the structure of another front fixing group in an embodiment of the present application. Fig.13 As shown, in one embodiment, optionally, the first front fixed lens 301 is a rear meniscus lens, and the second front fixed lens 302 is a front meniscus lens; the first front fixed lens 301 and the second front fixed lens 302 are glued together.

[0155] That is to say, the front fixed group 101 can also arrange a rear meniscus lens with negative optical focal length and a front meniscus lens with positive optical focal length in sequence along the optical axis direction. In this way, after the light passes through the rear meniscus lens with negative optical focal length and the front meniscus lens with positive optical focal length in sequence, the astigmatism, field curvature, chromatic aberration and spherical aberration can be reduced, which is beneficial to the imaging of the front fixed group 101.

[0156] In one embodiment, optionally, the refractive index of the first front fixed lens 301 is 1.8-2; the refractive index of the second front fixed lens 302 is 1.4-1.6. In this way, a rear meniscus lens with negative optical power and a front meniscus lens with positive optical power are realized, and the image focal length f of the first front fixed lens at the central wavelength is 11 satisfy The image focal length f of the second front fixed lens at the central wavelength 12 satisfy

[0157] Fig.14 FIG. 1 is a schematic diagram of the structure of another zoom group in the embodiment of the present application. Fig.14As shown, in one embodiment, optionally, the first zoom lens 401 is a front meniscus lens, the second zoom lens 402 is a rear meniscus lens, and the third zoom lens 403 is a double convex lens; the first zoom lens 401 and the second zoom lens 402 are glued together.

[0158] That is to say, the zoom group 102 can also sequentially arrange a cemented lens consisting of a front meniscus lens with negative optical power and a rear meniscus lens with positive optical power, and a biconvex lens with positive optical power along the optical axis direction. Similarly, cementing the front meniscus lens with negative optical power and the rear meniscus lens with positive optical power together helps to correct chromatic aberration and spherical aberration, thereby improving the imaging quality of the zoom group 102.

[0159] In one embodiment, the refractive index of the first zoom lens 401 is 1.4 to 1.7; the refractive index of the second zoom lens 402 is 1.7 to 2; and the refractive index of the third zoom lens 403 is 1.4 to 1.6. In this way, a front meniscus lens with negative optical power, a rear meniscus lens with positive optical power, and a biconvex lens with positive optical power are realized, and the image focal length f of the first zoom lens at the central wavelength is 21 satisfy The image focal length f of the second zoom lens at the central wavelength 22 satisfy The image focal length f of the third zoom lens at the central wavelength 23 satisfy

[0160] Fig.15 FIG. 1 is a schematic diagram of the structure of another compensation group in an embodiment of the present application. Fig.15 As shown, in one embodiment, optionally, the first compensation lens 501 is a biconvex lens, the second compensation lens 502 is a biconvex lens, and the third compensation lens 503 is a biconcave lens.

[0161] That is to say, the compensation group 103 can sequentially arrange two front meniscus lenses with positive optical power and a biconcave lens with negative optical power along the optical axis direction. In this way, the zoom group 102 combines a lens with positive optical power and a lens with negative optical power, which can improve the imaging quality of the zoom group 102.

[0162] In one embodiment, optionally, the refractive index of the first compensating lens 501 is 1.4-1.6; the refractive index of the second compensating lens 502 is 1.4-1.6; and the refractive index of the third compensating lens 503 is 1.7-2. In this way, a front meniscus lens with positive focal power and a biconcave lens with negative focal power are realized, and the image focal length f of the first compensating lens at the central wavelength is 31 satisfy The image focal length f of the second compensation lens at the central wavelength is32 satisfy The image focal length f of the third compensation lens at the central wavelength 32 satisfy

[0163] Fig.16 FIG. 1 is a schematic diagram of the structure of another rear fixing group in an embodiment of the present application. Fig.16 As shown, in one embodiment, optionally, the first rear fixed lens 601 is a front meniscus lens, the second rear fixed lens 602 is a biconvex lens, and the third rear fixed lens 603 is a front meniscus lens; the first rear fixed lens 601 and the second rear fixed lens 602 are glued together.

[0164] That is to say, the rear fixed group 201 may also sequentially arrange a front meniscus lens with positive power, a cemented lens composed of a biconvex lens with positive power, and a front meniscus lens with negative power along the optical axis direction. Similarly, after the front meniscus lens with positive power and the biconvex lens with positive power are cemented and connected, and combined with the front meniscus lens with negative power, it can be beneficial to the imaging of the rear fixed group 201.

[0165] In one embodiment, optionally, the refractive index of the first rear fixed lens 601 is 1.7-2; the refractive index of the second rear fixed lens 602 is 1.4-1.6; the refractive index of the third rear fixed lens 603 is 1.75-1.95. In this way, a front meniscus lens with positive focal power, a biconvex lens with positive focal power, and a front meniscus lens with negative focal power are realized, and the image focal length f of the first rear fixed lens at the central wavelength is 41 satisfy The image focal length f of the second rear fixed lens at the central wavelength 42 satisfy The image focal length f of the third rear fixed lens at the central wavelength 43 satisfy

[0166] Fig.17 FIG. 1 is a schematic diagram of the structure of another optical imaging lens assembly in an embodiment of the present application. Fig.17 As shown, in one embodiment, optionally, the front fixed group 101 includes a first front fixed lens 301 and a second front fixed lens 302 arranged along the optical axis; the zoom group 102 includes a first zoom lens 401, a second zoom lens 402 and a third zoom lens 403 arranged along the optical axis; the compensation group 103 includes a first compensation lens 501, a second compensation lens 502 and a third compensation lens 503 arranged along the optical axis; the rear fixed group 201 includes a first rear fixed lens 601, a second rear fixed lens 602 and a third rear fixed lens 603 arranged along the optical axis.

[0167] The first front fixed lens 301 is a rear meniscus lens, and the second front fixed lens 302 is a front meniscus lens; the first front fixed lens 301 is glued to the second front fixed lens 302. The refractive index of the first front fixed lens 301 may be 1.9; the refractive index of the second front fixed lens 302 may be 1.58;

[0168] The first zoom lens 401 is a front meniscus lens, the second zoom lens 402 is a rear meniscus lens, and the third zoom lens 403 is a double convex lens; the first zoom lens 401 and the second zoom lens 402 are glued together. The refractive index of the first zoom lens 401 can be 1.67; the refractive index of the second zoom lens 402 can be 1.88; the refractive index of the third zoom lens 403 can be 1.52;

[0169] The first compensation lens 501 is a biconvex lens, the second compensation lens 502 is a biconvex lens, and the third compensation lens 503 is a biconcave lens. The refractive index of the first compensation lens 501 may be 1.45; the refractive index of the second compensation lens 502 may be 1.53; the refractive index of the third compensation lens 503 may be 1.75;

[0170] The first rear fixed lens 601 is a front meniscus lens, the second rear fixed lens 602 is a biconvex lens, and the third rear fixed lens 603 is a front meniscus lens; the first rear fixed lens 601 and the second rear fixed lens 602 are glued together.

[0171] The refractive index of the first rear fixed lens 601 may be 1.89; the refractive index of the second rear fixed lens 602 may be 1.53; and the refractive index of the third rear fixed lens 603 may be 1.75.

[0172] Similarly, by changing the relative positions of the zoom group 102 and the compensation group 103, that is, in the process of linkage between the zoom group 102 and the compensation group 103, the zoom of the optical imaging lens group is also achieved. Fig.17 The structure diagram of the optical imaging lens assembly 100 at long focus, medium focus and short focus is shown. The four components in the above optical imaging lens assembly 100 can also reduce astigmatism, field curvature, chromatic aberration and spherical aberration. Therefore, Fig.17 The optical imaging lens assembly 100 shown can also improve the imaging quality and facilitate imaging.

[0173] It should be noted that the refractive index measured at different wavelengths is also different. The "refractive index" and in this embodiment are parameters of d (helium atom) light, that is, when the wavelength is at 587.6nm.

[0174] In one embodiment, the optical imaging lens assembly 100 optionally further includes an aperture surface, which coincides with the front surface of the front fixed assembly 101. Since the aperture surface coincides with the front surface of the front fixed assembly 101, the aperture is pre-positioned, thereby reducing the aperture and aberration to improve the imaging quality.

[0175] For example, in one embodiment, the optical imaging lens assembly 100 has a zoom distance of 15-30 mm, a reserved back focal length of 14 mm, a zoom ratio of 2, an entrance pupil diameter of 4 mm, a field of view angle of 8.5°, an operating wavelength in the range of 0.44 um-0.85 um, and a center wavelength of 0.56 um.

[0176] Fig.18 is a schematic diagram of the structure of an optical mount in an embodiment of the present application, such as Fig.18 As shown, the optical mount 1800 includes an imaging chip 1801 and any one of the above-mentioned optical imaging lens assemblies 100 . Fig.18 (a) shows the Fig.12 Based on the optical mount 1800, Fig.18 (b) shows that Fig.17 The optical bayonet mount 1800 is based on the optical bayonet mount 1800. It can be understood that the optical bayonet mount 1800 is a zoom optical bayonet mount.

[0177] Fig.19 Schematic diagram of the structure of an endoscope in an embodiment of the present application, such as Fig.19 As shown, in one embodiment, an endoscope 1900 is also provided, and the endoscope 1900 includes any of the optical mounts 1800 described above.

[0178] In some embodiments, the above-mentioned optical imaging lens set 100, optical bayonet 1800 and endoscope 1900 can be applied to the field of minimally invasive surgical instrument endoscopes. For example, the optical bayonet 1800 connects the optical viewing tube and the imaging chip to form an endoscope 1900, so as to image the internal tissue of the patient's cavity and transmit it to the monitor for the doctor to watch in real time. Since this embodiment can realize optical zoom, the doctor can partially magnify the tissue in the patient's cavity, and the clarity is high and the depth of field is large, which is conducive to improving the doctor's work efficiency.

[0179] Fig. 20This is a movement curve diagram in the embodiment of the present application, which shows the movement curve diagrams of the variable magnification lens group 102 and the compensation lens group 103 in the optical imaging lens group 100. The air gap between the variable magnification lens group 102 and the front fixed lens group 101 changes in the range of 1mm-16.3mm during the zooming process, and the air gap between the compensation lens group 103 and the variable magnification lens group 102 changes in the range of 1.6mm-9.7mm during the zooming process. It can be seen that after adding the compensation lens group 103, the focal length of the system, that is, the focal length of the optical imaging lens group 100, shows a nearly linear change, and the zooming effect is better.

[0180] Fig.21 is a modulation transfer function (MTF) curve diagram in an embodiment of the present application, Fig.21 FIG. 1 shows an MTF curve diagram of the optical imaging lens assembly 100 when the focal length is 30 mm. Fig.21 As shown in the figure, it shows the MTF curves corresponding to the meridian and sagittal planes at 0-250cy / mm (cycles per millimeter) at 0° field of view, 3° field of view, and 8.5° field of view, and gives the MTF curve under the diffraction limit condition for comparison. It can be seen that when the MTF drops to 0.2, the corresponding spatial frequency is about 160cy / mm, and the imaging quality is good.

[0181] Fig. 22 is a schematic diagram of field curvature and distortion in an embodiment of the present application, Fig. 22 (a) shows a field curvature curve diagram when the focal length of the optical imaging lens assembly 100 is 30 mm, Fig. 22 (b) shows the distortion curve of the optical imaging lens group 100 when the focal length is 30 mm. Fig. 22 As shown, the field curvature of the optical imaging lens assembly 100 at the maximum field of view does not exceed 0.03 mm, the distortion does not exceed 3.2%, and the imaging quality is good.

[0182] Fig.23 This is another MTF curve diagram in the embodiment of the present application. Fig.21 FIG. 1 shows an MTF curve diagram of the optical imaging lens assembly 100 when the focal length is 15 mm. Fig.23 As shown in the figure, it shows the MTF curves corresponding to the 0° field of view, 3° field of view and 8.5° field of view in the meridian and sagittal planes at 0-250cy / mm, and gives the MTF curve under the diffraction limit condition for comparison. It can be seen that when the spatial frequency is 250cy / mm, the MTF value is still 0.35, and the imaging quality is good.

[0183] Fig.24 This is another schematic diagram of field curvature and distortion in an embodiment of the present application. Fig. 22(a) shows a field curvature curve diagram when the focal length of the optical imaging lens assembly 100 is 15 mm, Fig. 22 (b) shows the distortion curve of the optical imaging lens group 100 when the focal length is 30 mm. The figure shows that the field curvature at the maximum field of view does not exceed 0.01 mm, the distortion does not exceed 2.5%, and the imaging quality is good.

[0184] The system achieves continuous zoom in the range of 15-30mm through mechanical compensation through 12 glass lenses. The operating wavelength ranges from visible light to infrared light. The imaging quality is excellent and the distortion is small. The aperture is placed in front and a 14mm back focal length is reserved. The movement curve of the compensation group changes nearly linearly.

[0185] In summary, since the optical imaging lens group 100 in this embodiment includes 11 or 12 glass lenses, and the relative positions of the zoom lens group and the compensation lens group in the optical system are moved by mechanical compensation, a continuous focal length change range from 15 mm to 30 mm is achieved.

[0186] In addition, through the combination of specific lens curvature radius, material thickness and material type, high definition, small distortion and 0.44um-0.85um working wavelength are achieved. The imaging clarity is excellent within the zoom range, and the imaging chip with a resolution of 4K can be used. The working band can extend from the visible light band to the near-infrared band, and a certain length of back focal length is reserved to adapt to fluorescent endoscopes.

[0187] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0188] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. An optical imaging lens assembly, characterized in that: The optical imaging lens assembly comprises a front fixed group, a zoom group and a compensation group arranged along the optical axis direction, wherein the zoom group is arranged between the front fixed group and the compensation group; the zoom group and the compensation group are used to change the focal length of the optical imaging lens assembly in a linkage manner along the optical axis direction; The image focal length f1 of the front fixed group at the central wavelength satisfies The image focal length f2 of the zoom group at the central wavelength satisfies The image focal length f3 of the compensation group at the central wavelength satisfies Where f is the shortest focal length of the optical imaging lens assembly within the adjustable focal length range at the central wavelength.

2. The optical imaging lens assembly according to claim 1, characterized in that: The optical imaging lens assembly further includes a rear fixing group, and the compensation group is arranged between the variable magnification group and the rear fixing group; The image focal length f4 of the rear fixed lens group at the central wavelength satisfies 3. The optical imaging lens assembly according to claim 1 or 2, characterized in that: The front fixed group includes a first front fixed lens and a second front fixed lens arranged along the optical axis direction; The image focal length f of the first front fixed lens at the central wavelength 11 satisfy The image focal length f of the second front fixed lens at the central wavelength 12 satisfy 4. The optical imaging lens assembly according to claim 1 or 2, characterized in that: The zoom group includes a first zoom lens, a second zoom lens and a third zoom lens arranged along the optical axis direction; The image focal length f of the first variable magnification lens at the central wavelength 21 satisfy The image focal length f of the second variable magnification lens at the central wavelength 22 satisfy The image focal length f of the third variable magnification lens at the central wavelength 23 satisfy 5. The optical imaging lens assembly according to claim 1 or 2, characterized in that: The compensation group includes a first compensation lens, a second compensation lens and a third compensation lens arranged along the optical axis direction; The image focal length f of the first compensation lens at the central wavelength is 31 satisfy The image focal length f of the second compensation lens at the central wavelength is 32 satisfy The image focal length f of the third compensation lens at the central wavelength is 32 satisfy 6. The optical imaging lens assembly according to claim 2, characterized in that: The rear fixed group includes a first rear fixed lens, a second rear fixed lens and a third rear fixed lens arranged along the optical axis direction; The image focal length f of the first rear fixed lens at the central wavelength is 41 satisfy The image focal length f of the second rear fixed lens at the central wavelength 42 satisfy The image focal length f of the third rear fixed lens at the central wavelength 43 satisfy 7. The optical imaging lens assembly according to claim 3, characterized in that: The first front fixed lens is a biconcave lens, and the second front fixed lens is a rear meniscus lens.

8. The optical imaging lens assembly according to claim 7, characterized in that: The refractive index of the first front fixed lens is 1.4 to 1.6; The refractive index of the second front fixed lens is 1.8-2.

9. The optical imaging lens assembly according to claim 4, characterized in that: The first variable magnification lens is a back meniscus lens, the second variable magnification lens is a back meniscus lens, and the third variable magnification lens is a biconvex lens; The first variable power lens is glued to the second variable power lens.

10. The optical imaging lens assembly according to claim 9, characterized in that: The refractive index of the first variator lens is 1.4 to 1.6, and the refractive index of the second variator lens is 1.7 to 1.9; The refractive index of the third variable power lens is 1.4-1.

6.

11. The optical imaging lens assembly according to claim 5, characterized in that: The compensation group further includes a fourth compensation lens, and the third compensation lens is located between the second compensation lens and the fourth compensation lens; The image focal length f of the fourth compensation lens at the central wavelength is 34 satisfy 12. The optical imaging lens assembly according to claim 11, characterized in that: The first compensation lens is a front meniscus lens, the second compensation lens is a biconvex lens, the third compensation lens is a rear meniscus lens, and the fourth compensation lens is a rear meniscus lens; The first compensation lens is glued to the second compensation lens, and the third compensation lens is glued to the fourth compensation lens.

13. The optical imaging lens assembly according to claim 12, characterized in that: The refractive index of the first compensation lens is 1.8 to 2; The refractive index of the second compensation lens is 1.4 to 1.6; The refractive index of the third compensation lens is 1.6 to 1.8; The refractive index of the fourth compensation lens is 1.8-2.

14. The optical imaging lens assembly according to claim 6, characterized in that: The first rear fixed lens is a biconvex lens, the second rear fixed lens is a rear meniscus lens, and the third rear fixed lens is a biconcave lens.

15. The optical imaging lens assembly according to claim 6 or 14, characterized in that: The refractive index of the first rear fixed lens is 1.5 to 1.7; The refractive index of the second rear fixed lens is 1.6 to 1.8; The refractive index of the third rear fixed lens is 1.7-1.

9.

16. The optical imaging lens assembly according to claim 3, characterized in that: The first front fixed lens is a rear meniscus lens, and the second front fixed lens is a front meniscus lens; The first front fixed lens is glued and connected to the second front fixed lens.

17. The optical imaging lens assembly according to claim 16, characterized in that: The refractive index of the first front fixed lens is 1.8 to 2; The refractive index of the second front fixed lens is 1.4-1.

6.

18. The optical imaging lens assembly according to claim 4, characterized in that: The first variable magnification lens is a front meniscus lens, the second variable magnification lens is a rear meniscus lens, and the third variable magnification lens is a biconvex lens; The first variable power lens and the second variable power lens are glued together.

19. The optical imaging lens assembly according to claim 18, characterized in that: The refractive index of the first variable power lens is 1.4 to 1.7; The refractive index of the second variable power lens is 1.7 to 2; The refractive index of the third variable power lens is 1.4-1.

6.

20. The optical imaging lens assembly according to claim 5, characterized in that: The first compensation lens is a biconvex lens, the second compensation lens is a biconvex lens, and the third compensation lens is a biconcave lens.

21. The optical imaging lens assembly according to claim 20, characterized in that: The refractive index of the first compensation lens is 1.4 to 1.6; The refractive index of the second compensation lens is 1.4 to 1.6; The refractive index of the third compensation lens is 1.7-2.

22. The optical imaging lens assembly according to claim 6, characterized in that: The first rear fixed lens is a front meniscus lens, the second rear fixed lens is a biconvex lens, and the third rear fixed lens is a front meniscus lens; The first rear fixed lens is glued and connected to the second rear fixed lens.

23. The optical imaging lens assembly according to claim 6 or 22, characterized in that: The refractive index of the first rear fixed lens is 1.7 to 2; The refractive index of the second rear fixed lens is 1.4 to 1.6; The refractive index of the third rear fixed lens is 1.75-1.

95.

24. The optical imaging lens assembly according to claim 1 or 2, characterized in that: The optical imaging lens group also includes an aperture surface, which coincides with the front surface of the front fixed group.

25. An optical mount, characterized in that: The optical mount comprises an imaging chip and the optical imaging lens assembly as claimed in any one of claims 1 to 24, wherein the imaging chip is arranged behind the optical imaging lens assembly along the optical axis direction.

26. An endoscope, characterized in that: The endoscope comprises the optical mount of claim 25 .

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