Zoom lens suitable for surgical exterior mirror
By designing a zoom lens suitable for surgical exterior mirrors, combining the combination of negative and positive power lens groups and mechanical linkage, the image surface instability and optical zoom ratio of the exterior mirror lens during the zooming process is solved. The problem of insufficient results enables efficient imaging and multifunctional fusion, suitable for complex surgical environments.
Patent Information
- Application Number
- CN202411460278.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-18
- Publication Date
- 2024-12-13
AI Technical Summary
The existing exterior lens lenses do not have a stable image surface, a high optical zoom ratio and space utilization during the zoom process, and it is difficult to meet the complex and variable surgical environment and the imaging accuracy requirements of the surgeon.
A zoom lens suitable for surgical exterior mirrors is designed, including a large objective lens group, a front fixing group, a zoom group, a compensation group and a rear fixing group. The working distance and zooming are achieved through the movement of the components to ensure the stability of the image surface. Moreover, the optical zoom ratio is high, and the combination of negative and positive power lens groups is adopted, combined with mechanical linkage method to achieve efficient imaging.
Large changes in working distance range and high optical zoom ratio are achieved, the stability and clarity of imaging are ensured, surgical quality and equipment applicability are improved, and it is suitable for use in different departments, and space utilization is improved.
Smart Images
Figure CN119126354A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of optical lenses and relates to a zoom lens suitable for a surgical exoscope. Background Art
[0002] The exoscopic microscope is a new type of surgical auxiliary microscope system. Its appearance marks the beginning of the replacement of traditional surgical microscopes. In comparison, the exoscopic microscope is farther away from the surgeon and the patient, has a more reasonable ergonomic working mode, more convenient and efficient operation, a lighter appearance, and is easy to integrate with intraoperative navigation data and other display-based surgical equipment. These advantages can effectively reduce the surgeon's fatigue and improve the quality of surgery. In 2008, the test of 2D exoscopic microscope on living animal models was first reported and began to attract a lot of attention. At present, Karl Storz's VITOM 3D, ZEISS's KINEVO 900 and Olympus's ORBEYE are all relatively mature exoscopic systems.
[0003] Although exoscopic microscopes have many outstanding advantages, different departments have different requirements for the working distance and magnification of exoscopic lenses. The complex and ever-changing surgical environment and the surgeon's requirements for imaging accuracy have put forward more stringent standards for the continuous upgrading of their optical systems. Specifically, in the process of zooming, exoscopic lenses often do not have stable image planes, high optical zoom ratios, and space utilization. Summary of the invention
[0004] To solve the above problems, the present invention discloses a zoom lens suitable for surgical exoscopes, which can adapt to complex and changeable surgical environments, ensure the stability of the image plane and the accuracy of imaging during the zooming process, and achieve a higher optical zoom ratio.
[0005] The specific plan is as follows:
[0006] A zoom lens suitable for surgical exoscopes, comprising a large objective lens group and at least two imaging light paths located above the large objective lens group; each imaging light path sequentially comprises a front fixed group, a zoom group, an aperture, a compensation group and a rear fixed group arranged coaxially; wherein the large objective lens group is a negative focal power lens group, sequentially comprising a first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged coaxially; the front fixed group is a positive focal power lens group, sequentially comprising a flat glass, a sixth lens, a seventh lens and an eighth lens arranged coaxially; the zoom group is a negative focal power lens group, sequentially comprising a ninth lens and a tenth lens arranged coaxially; the compensation group is a negative focal power lens group, sequentially comprising an eleventh lens and a twelfth lens arranged coaxially. The rear fixed group is a positive power lens group, which includes the thirteenth lens, the fourteenth lens, the fifteenth lens, the sixteenth lens, the seventeenth lens, the eighteenth lens, the nineteenth lens, the twentieth lens, the twenty-first lens and the twenty-second lens which are coaxially arranged in sequence; wherein, the first lens, the fourth lens, the fifth lens, the seventh lens, the eighth lens, the eleventh lens, the twelfth lens, the thirteenth lens, the fourteenth lens, the eighteenth lens and the twentieth lens are positive lenses; the second lens, the third lens, the sixth lens, the ninth lens, the tenth lens, the fifteenth lens, the sixteenth lens, the seventeenth lens, the nineteenth lens, the twenty-first lens and the twenty-second lens are negative lenses; and the surface types of all the lenses are spherical.
[0007] Optionally, the third lens and the fourth lens form a double cemented lens, the sixth lens and the seventh lens form a double cemented lens, the ninth lens and the tenth lens form a double cemented lens, the eleventh lens and the twelfth lens form a double cemented lens, the fourteenth lens and the fifteenth lens form a double cemented lens, the sixteenth lens and the seventeenth lens form a double cemented lens, and the twentieth lens and the twenty-first lens form a double cemented lens.
[0008] Optionally, the focal length of the large objective lens group is f1, the focal length of the front fixed group is f2, the focal length of the zoom group is f3, the focal length of the compensation group is f5, the focal length of the rear fixed group is f6, the focal length of the first lens is f10, the focal length of the second lens is f11, the focal length of the third lens is f12, the focal length of the fourth lens is f13, the focal length of the fifth lens is f14, the focal length of the sixth lens is f21, the focal length of the seventh lens is f22, the focal length of the eighth lens is f23, the focal length of the ninth lens is f30, and the focal length of the first lens is f10. The focal length of the tenth lens is f31, the focal length of the eleventh lens is f50, the focal length of the twelfth lens is f51, the focal length of the thirteenth lens is f60, the focal length of the fourteenth lens is f61, the focal length of the fifteenth lens is f62, the focal length of the sixteenth lens is f63, the focal length of the seventeenth lens is f64, the focal length of the eighteenth lens is f65, the focal length of the nineteenth lens is f66, the focal length of the twentieth lens is f67, the focal length of the twenty-first lens is f68, and the focal length of the twenty-second lens is f69.
[0009] Optionally, the zoom lens achieves variable working distance and variable magnification (zoom) at the same working distance by moving some components; the working distance of the zoom lens includes three modes: long, medium and short, with a variation range of ≥300mm, a longest working distance of ≥600mm, and a shortest working distance of ≥300mm; the zoom ratio of the zoom lens at the same working distance is ≥7, and the overall optical zoom ratio is ≥8.
[0010] Optionally, the focal length of the large objective lens group is f1, the focal length of the front fixed group is f2, the focal length of the zoom group is f3, the focal length of the compensation group is f5, the focal length of the rear fixed group is f6, and the focal length of the zoom lens at the long working distance and wide-angle end is f; wherein, -231.271≤f1 / f≤-73.039, 2.795≤f2 / f≤2.854, -1.741≤f3 / f≤-1.736, -1.261≤f5 / f≤-1.257, and 0.885≤f6 / f≤0.989.
[0011] Optionally, the aperture is arranged between the tenth lens and the eleventh lens, the distance from the aperture to the image plane is L, and the total optical length of the zoom lens is TTL, wherein 0.365≤L / TTL≤0.389.
[0012] Optionally, the moving components of each imaging optical path are the zoom group and the compensation group, and the fixed components are the front fixed group and the rear fixed group; wherein the movement only involves the overall movement of the components, and does not involve the movement of the lenses and the flat glass, and the fixation refers to the overall fixation of the components, the glass included in the components, and the flat glass; when the large objective lens group changes magnification at the same working distance, the relative position and absolute position of each lens do not change; when the large objective lens group changes the working distance, the third lens, the fourth lens and the fifth lens move backward as a whole, and the distance between the second lens and the third lens, and the distance between the fifth lens and the rear group of flat glass change.
[0013] Optionally, the zoom lens satisfies the following conditions: 0.163≤S1 / TTL≤0.165, 0.080≤S2 / TTL≤0.082, 0.070≤S3 / TTL≤0.072, wherein S1 is the relative displacement of the zoom group when the zoom lens is at the wide-angle end position and when the zoom lens is at the telephoto end position, S2 is the relative displacement of the compensation group when the zoom lens is at the wide-angle end position and when the zoom lens is at the telephoto end position, S3 is the relative displacement of the third lens, the fourth lens and the fifth lens in the large lens group as a whole when the zoom lens is at the long working distance position and when the zoom lens is at the short working distance position, and TTL is the total optical length of the zoom lens.
[0014] Optionally, the zooming method of the zoom lens is: during the magnification change at the same working distance, the change in the conjugate distance of the moving component arranged in the imaging optical path is zero, the image plane remains stable and the size remains unchanged, the large objective lens group, the front fixed group and the rear fixed group are fixed, the zoom group and the compensation group cooperate with each other to perform mechanical linkage to change the optical magnification; and when the working distance needs to be changed, the distance of the lenses inside the large objective lens group is also controlled.
[0015] Optionally, the mechanical linkage method includes a cam mechanism and a four-bar four-rod mechanism; the multiple imaging optical path structures and zoom methods are completely consistent; the multiple imaging optical paths are distributed in a circular array along the optical axis of the large objective lens group; the optical axes of two adjacent imaging optical paths are ≥25mm apart; the multiple imaging optical paths can be used for ICG fluorescence imaging, blue light imaging, and narrow-band imaging; the zoom lens 5.1≤F number≤11.0.
[0016] The beneficial effects of the present invention are as follows: 1. The surgical exoscope zoom lens provided by the present invention can achieve a large range of changes in the working distance and a high optical zoom ratio. The design provided in the embodiment realizes 18 levels of adjustment, a working distance variation range of 350mm, and an optical zoom ratio of nearly 9 times, which can enable the exoscope to be better matched and used between different departments, thereby improving applicability. 2. During the zooming process of the surgical exoscope zoom lens provided by the present invention, the change in the conjugate distance of the moving component set in the imaging optical path is zero, and the image plane always remains stable and unchanged in size, which is conducive to stable and clear imaging and improves the quality of surgery. 3. In the surgical exoscope zoom lens provided by the present invention, a plurality of the imaging optical paths can be placed above a group of large objective lens groups for multi-mode imaging, which improves space utilization, makes the exoscope more lightweight and efficient, and realizes multi-functional fusion. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a basic structural schematic diagram of a zoom lens suitable for a surgical exoscope of the present invention (the schematic diagram only shows one imaging light path because multiple imaging light path structures and zoom modes are completely consistent).
[0018] Figure 2 Schematic diagram of the optical path of a zoom lens with a long working distance and wide angle.
[0019] Figure 3 Schematic diagram of the optical path of a zoom lens with long working distance and telephoto end.
[0020] Figure 4 Schematic diagram of the optical path of a medium working distance, wide-angle zoom lens.
[0021] Figure 5 Schematic diagram of the optical path of a zoom lens with medium working distance and long focal length.
[0022] Figure 6 Schematic diagram of the optical path of a zoom lens with short working distance and wide angle.
[0023] Figure 7 Schematic diagram of the optical path of a zoom lens with short working distance and long focal length.
[0024] Figure 8 This is the imaging point diagram of a zoom lens with a long working distance and wide angle.
[0025] Fig. 9 This is the imaging point diagram of a zoom lens with a long working distance and a long focal length.
[0026] Fig.10 This is the imaging point diagram of a zoom lens with medium working distance and wide angle.
[0027] Fig.11 This is the imaging point diagram of a zoom lens with medium working distance and long focal length.
[0028] Fig.12 This is the imaging point diagram of a zoom lens with a short working distance and wide angle.
[0029] Fig.13 This is the imaging point diagram of a zoom lens with short working distance and long focal length.
[0030] Fig.14 A schematic diagram of the optical path of another lens with a long working distance and a telephoto end that meets the requirements of the present invention.
[0031] Fig.15 A schematic diagram of the optical path of another lens with a long working distance and a telephoto end that meets the requirements of the present invention.
[0032] Fig.16 A schematic diagram of the optical path of another lens with a long working distance and a telephoto end that meets the requirements of the present invention.
[0033] Fig.17 A schematic diagram of the optical path of another lens with a long working distance and a telephoto end that meets the requirements of the present invention.
[0034] Fig.18 A schematic diagram of the optical path of another lens with a long working distance and a telephoto end that meets the requirements of the present invention.
[0035] Fig.19 A schematic diagram of the optical path of another lens with a long working distance and a telephoto end that meets the requirements of the present invention.
[0036] List of reference numerals:
[0037] 1. Large objective lens group; 10. First lens; 11. Second lens; 12. Third lens; 13. Fourth lens; 14. Fifth lens; 2. Front fixed group; 20. Flat glass; 21. Sixth lens; 22. Seventh lens; 23. Eighth lens; 3. Zoom group; 30. Ninth lens; 31. Tenth lens; 4. Diaphragm; 5. Compensation group; 50. Eleventh lens; 51. Twelfth lens; 6. Rear fixed group; 60. Thirteenth lens; 61. Fourteenth lens; 62. Fifteenth lens; 63. Sixteenth lens; 64. Seventeenth lens; 65. Eighteenth lens; 66. Nineteenth lens; 67. Twentieth lens; 68. Twenty-first lens; 69. Twenty-second lens. DETAILED DESCRIPTION
[0038] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.
[0039] The present invention provides a zoom lens suitable for surgical exoscopes, such as Figure 1The basic structure diagram is shown in FIG. 1 (because the structures and zooming modes of multiple imaging optical paths are completely the same, only one imaging optical path is shown in the diagram). The large objective lens group 1 and at least two imaging optical paths located above the large objective lens group 1 are sequentially included; each imaging optical path sequentially includes a coaxially arranged front fixed group 2, a zoom group 3, a compensation group 5, a rear fixed group 6 and an aperture 4. Among them, the large objective lens group 1 is a negative power lens group, which includes a first lens 10, a second lens 11, a third lens 12, a fourth lens 13 and a fifth lens 14 which are coaxially arranged in sequence; the front fixed group 2 is a positive power lens group, which includes a flat glass 20, a sixth lens 21, a seventh lens 22 and an eighth lens 23 which are coaxially arranged in sequence; the zoom group 3 is a negative power lens group, which includes a ninth lens 30 and a tenth lens 31 which are coaxially arranged in sequence; the compensation group 5 is a negative power lens group, which includes an eleventh lens 50 and a twelfth lens 51 which are coaxially arranged in sequence; the rear fixed group 6 is a positive power lens group, which includes a thirteenth lens 60, a fourteenth lens 61, a fifteenth lens 62, a sixteenth lens 63, a seventeenth lens 64, an eighteenth lens 65, a nineteenth lens 66, a twentieth lens 67, a twenty-first lens 68 and a twenty-second lens 69 which are coaxially arranged in sequence.
[0040] Among them, the first lens 10, the fourth lens 13, the fifth lens 14, the seventh lens 22, the eighth lens 23, the eleventh lens 50, the twelfth lens 51, the thirteenth lens 52, the fourteenth lens 53, the eighteenth lens 65, and the twentieth lens 67 are positive lenses; the second lens 11, the third lens 12, the sixth lens 21, the ninth lens 30, the tenth lens 31, the fifteenth lens 62, the sixteenth lens 63, the seventeenth lens 64, the nineteenth lens 66, the twenty-first lens 68, and the twenty-second lens 69 are negative lenses; and the surface type of all lenses is spherical.
[0041] Among them, the third lens 12 and the fourth lens 13 form a double cemented lens, the sixth lens 21 and the seventh lens 22 form a double cemented lens, the ninth lens 30 and the tenth lens 31 form a double cemented lens, the eleventh lens 50 and the twelfth lens 51 form a double cemented lens, the fourteenth lens 61 and the fifteenth lens 62 form a double cemented lens, the sixteenth lens 63 and the seventeenth lens 64 form a double cemented lens, and the twentieth lens 67 and the twenty-first lens 68 form a double cemented lens.
[0042] like Figures 2 to 7The optical path diagram of the six gears (wide-angle end and telephoto end at long, medium and short working distances) of a zoom lens embodiment of the present invention suitable for surgical exoscopes is shown, corresponding to the lens parameters of Tables 1 to 6. The long, medium and short working distances are 650mm, 400mm and 300mm respectively, the distance from the first optical surface to the image plane in the large objective lens group 1 is always kept at 260.015mm when the magnification or working distance is changed, the object-image conjugate distance of the magnification change at the same working distance remains unchanged, and the image plane is always kept stable.
[0043] Table 1 Parameters of long working distance and wide angle lens
[0044]
[0045]
[0046] Table 2 Parameters of long working distance and telephoto end lenses
[0047]
[0048]
[0049] Working distance and wide-angle lens parameters in Table 3
[0050]
[0051]
[0052] Working distance and telephoto lens parameters in Table 4
[0053]
[0054]
[0055] Table 5 Short working distance, wide angle lens parameters
[0056]
[0057]
[0058] Table 6 Short working distance and long focal length lens parameters
[0059]
[0060] Specifically, there are 6 levels of variable optical magnification at each working distance. The specific parameters are shown in Table 7. The focal length range is 20.978-103.585mm, the observable half object height range is 14.383-126.344mm, and the field of view range is 16.277°-3.318°. The optical zoom ratio is 4.94 times, and the optical magnification ratio is 8.71 times.
[0061] Table 7 Comparison of basic parameters of various structures
[0062]
[0063] Specifically, the focal length of the large objective lens group 1 is f1, the focal length of the front fixed group 2 is f2, the focal length of the zoom group 3 is f3, the focal length of the compensation group 5 is f5, the focal length of the rear fixed group 6 is f6, the focal length of the first lens 10 is f10, the focal length of the second lens 11 is f11, the focal length of the third lens 13 is f12, the focal length of the fourth lens 13 is f13, the focal length of the fifth lens 14 is f14, the focal length of the sixth lens 21 is f21, the focal length of the seventh lens 22 is f22, the focal length of the eighth lens 23 is f23, the focal length of the ninth lens 30 is f30, the focal length of the tenth lens 31 is f31, and the focal length of the eleventh lens 32 is f34. The focal length of the twelfth lens 50 is f50, the focal length of the twelfth lens 51 is f51, the focal length of the thirteenth lens 60 is f60, the focal length of the fourteenth lens 61 is f61, the focal length of the fifteenth lens 62 is f62, the focal length of the sixteenth lens 63 is f63, the focal length of the seventeenth lens 64 is f64, the focal length of the eighteenth lens 65 is f65, the focal length of the nineteenth lens 66 is f66, the focal length of the twentieth lens 67 is f67, the focal length of the twenty-first lens 68 is f68, and the focal length of the twenty-second lens 69 is f69; wherein, -3.19≤f10 / f1≤-0.257, 0.021≤f 11 / f1≤0.073, 0.044≤f12 / f1≤0.082, -0.061≤f13 / f1≤-0.025, -0.151≤f14 / f1≤-0.055, -1.384≤f21 / f2≤-1.134, 5.75≤f22 / f2≤10.945, 1.101≤f23 / f2≤1.115, 1.343≤f30 / f3≤1.439, 3.692≤f31 / f3≤3.723, -2.460≤f50 / f5≤-2.000, 1.326≤f51 / f5≤1.3 40, 1.761≤f60 / f6≤1.773, 7.847≤f61 / f6≤30.292, -5.752≤f62 / f6≤-4.256, -12.853≤f63 / f6≤-8.809, -4.249≤f64 / f6≤-3.192, 3.441≤f65 / f6≤8.828, -9.566≤f66 / f6≤-9.560, 1.359≤f67 / f6≤1.821, -1.091≤f68 / f6≤-0.940, -74.165≤f69 / f6≤-5.394.
[0064] Specifically, the focal length of the large objective lens group 1 is f1, the focal length of the front fixed group 2 is f2, the focal length of the zoom group 3 is f3, the focal length of the compensation group 5 is f5, the focal length of the rear fixed group 6 is f6, and the focal length of the zoom lens at the long working distance and wide-angle end is f; among which, -231.271≤f1 / f≤-73.039, 2.795≤f2 / f≤2.854, -1.741≤f3 / f≤-1.736, -1.261≤f5 / f≤-1.257, and 0.885≤f6 / f≤0.989.
[0065] Specifically, the aperture 4 is disposed between the tenth lens 31 and the eleventh lens 50 , the distance from the aperture 4 to the image plane is L, and the total optical length of the zoom lens is TTL, wherein 0.365≤L / TTL≤0.389.
[0066] Specifically, the moving components of each imaging optical path are the zoom group 3 and the compensation group 5, and the fixed components are the front fixed group 2 and the rear fixed group 6. The movement here only involves the overall movement of the components, and does not involve the movement of the lenses and the flat glass. The fixation refers to the overall fixation of the components, the glass included in the components, and the flat glass. When the large objective lens group 1 changes the magnification at the same working distance, the relative position and absolute position of each lens do not change; when the large objective lens group 1 changes the working distance, the third lens 13, the fourth lens 14, and the fifth lens 15 move backward as a whole, and the distance between the second lens 11 and the third lens 13, and the distance between the fifth lens 14 and the rear flat glass 20 change.
[0067] Specifically, the zoom lens embodiment satisfies the following conditions: 0.163≤S1 / TTL≤0.165, 0.080≤S2 / TTL≤0.082, 0.070≤S3 / TTL≤0.072, wherein S1 is the relative displacement of the zoom group 3 when the zoom lens is at the wide-angle end position and when the zoom lens is at the telephoto end position, S2 is the relative displacement of the compensation group 5 when the zoom lens is at the wide-angle end position and when the zoom lens is at the telephoto end position, S3 is the relative displacement of the third lens 12, the fourth lens 13 and the fifth lens 14 in the large lens group 1 as a whole when the zoom lens is at the long working distance position and when the zoom lens is at the short working distance position, and TTL is the total optical length of the zoom lens.
[0068] Specifically, the surgical exoscopic lens is designed to zoom in the following way: during the zoom process at the same working distance, the change in the conjugate distance of the moving element set in the imaging optical path is zero, the image plane remains stable and unchanged in size, the large objective lens group, the front fixed group and the rear fixed group are fixed, and the zoom group and the compensation group cooperate with each other to perform mechanical linkage to change the optical magnification. When the working distance needs to be changed, the distance of the lenses inside the large objective lens group needs to be controlled.
[0069] Specifically, the zoom lens of the embodiment has an F number of 5.181≤F≤10.970.
[0070] Specifically, the imaging quality of the embodiment is good. Figures 8 to 13 The imaging point diagrams at the wide-angle and telephoto ends at long, medium and short working distances are shown. The RMS radius of the spot is smaller than or close to the radius of the Airy disk. Within the full field of view of the zoom lens, the MTF at 26lp / mm is higher than 0.1, and the MTF at the wide-angle end of 80lp / mm is higher than 0.2.
[0071] Figures 14 to 19 To provide a schematic diagram of the optical path of another lens that meets the requirements of the present invention, Tables 8 to 13 respectively represent the lens parameters of the lens under six working states.
[0072] Table 8 Parameters of long working distance and wide angle lens
[0073]
[0074]
[0075] Table 9 Parameters of long working distance and telephoto lenses
[0076]
[0077]
[0078] Working distance and wide-angle lens parameters in Table 10
[0079]
[0080]
[0081] Working distance and telephoto lens parameters in Table 11
[0082]
[0083]
[0084] Table 12 Short working distance, wide angle lens parameters
[0085]
[0086]
[0087] Table 13 Short working distance and long focal length lens parameters
[0088]
[0089]
[0090] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical schemes composed of any combination of the above-mentioned technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also regarded as the protection scope of the present invention.
Claims
1. A zoom lens suitable for a surgical exoscope, characterized in that: The invention comprises a large objective lens group and at least two imaging optical paths located above the large objective lens group; each imaging optical path comprises a front fixed group, a zoom group, an aperture, a compensation group and a rear fixed group arranged coaxially in sequence; wherein the large objective lens group is a negative optical power lens group, comprising a first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged coaxially in sequence; the front fixed group is a positive optical power lens group, comprising a flat glass, a sixth lens, a seventh lens and an eighth lens arranged coaxially in sequence; the zoom group is a negative optical power lens group, comprising a ninth lens and a tenth lens arranged coaxially in sequence; the compensation group is a negative optical power lens group, comprising an eleventh lens and a twelfth lens arranged coaxially in sequence; the rear fixed group is a positive ... first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged coaxially in sequence; the front fixed group is a positive optical power lens group, comprising a first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged coaxially in sequence; the front fixed group is a positive optical power lens group, comprising a first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged coaxially in sequence; the front fixed group is a positive optical power lens group, comprising a first lens, a second lens, a third lens, a fourth lens and a The optical power lens group includes, in sequence, a thirteenth lens, a fourteenth lens, a fifteenth lens, a sixteenth lens, a seventeenth lens, an eighteenth lens, a nineteenth lens, a twentieth lens, a twenty-first lens, and a twenty-second lens which are coaxially arranged; wherein, the first lens, the fourth lens, the fifth lens, the seventh lens, the eighth lens, the eleventh lens, the twelfth lens, the thirteenth lens, the fourteenth lens, the eighteenth lens, and the twentieth lens are positive lenses; the second lens, the third lens, the sixth lens, the ninth lens, the tenth lens, the fifteenth lens, the sixteenth lens, the seventeenth lens, the nineteenth lens, the twenty-first lens, and the twenty-second lens are negative lenses; and the surface types of all the lenses are spherical.
2. A zoom lens suitable for surgical exoscope according to claim 1, characterized in that: The third lens and the fourth lens form a double cemented lens, the sixth lens and the seventh lens form a double cemented lens, the ninth lens and the tenth lens form a double cemented lens, the eleventh lens and the twelfth lens form a double cemented lens, the fourteenth lens and the fifteenth lens form a double cemented lens, the sixteenth lens and the seventeenth lens form a double cemented lens, and the twentieth lens and the twenty-first lens form a double cemented lens.
3. The zoom lens suitable for surgical exoscope according to claim 1, characterized in that: The focal length of the large objective lens group is f1, the focal length of the front fixed group is f2, the focal length of the zoom group is f3, the focal length of the compensation group is f5, the focal length of the rear fixed group is f6, the focal length of the first lens is f10, the focal length of the second lens is f11, the focal length of the third lens is f12, the focal length of the fourth lens is f13, the focal length of the fifth lens is f14, the focal length of the sixth lens is f21, the focal length of the seventh lens is f22, the focal length of the eighth lens is f23, the focal length of the ninth lens is f30, the focal length of the tenth lens is f31, and the focal length of the tenth lens is f32. The focal length of the first lens is f50, the focal length of the twelfth lens is f51, the focal length of the thirteenth lens is f60, the focal length of the fourteenth lens is f61, the focal length of the fifteenth lens is f62, the focal length of the sixteenth lens is f63, the focal length of the seventeenth lens is f64, the focal length of the eighteenth lens is f65, the focal length of the nineteenth lens is f66, the focal length of the twentieth lens is f67, the focal length of the twenty-first lens is f68, and the focal length of the twenty-second lens is f69; wherein, -3.19≤f10 / f1≤-0.257, 0.021≤f 11 / f1≤0.073, 0.044≤f12 / f1≤0.082, -0.061≤f13 / f1≤-0.025, -0.151≤f14 / f1≤-0.055, -1.384≤f21 / f2≤-1.134, 5.75≤f22 / f2≤10.945, 1.101≤f23 / f2≤1.115, 1.343≤f30 / f3≤1.439, 3.692≤f31 / f3≤3.723, -2.460≤f50 / f5≤-2.000, 1.326≤f51 / f5≤1.3 40, 1.761≤f60 / f6≤1.773, 7.847≤f61 / f6≤30.292, -5.752≤f62 / f6≤-4.256, -12.853≤f63 / f6≤-8.809, -4.249≤f64 / f6≤-3.192, 3.441≤f65 / f6≤8.828, -9.566≤f66 / f6≤-9.560, 1.359≤f67 / f6≤1.821, -1.091≤f68 / f6≤-0.940, -74.165≤f69 / f6≤-5.
394.
4. The zoom lens for surgical exoscope according to claim 1, characterized in that: The zoom lens achieves variable working distance and variable magnification at the same working distance by moving some components; the working distance of the zoom lens includes three modes: long, medium and short, with a variation range of ≥300mm, a maximum working distance of ≥600mm, and a shortest working distance of ≥300mm; the zoom ratio of the zoom lens at the same working distance is ≥7, and the overall optical zoom ratio is ≥8.
5. The zoom lens suitable for surgical exoscope according to claim 4, characterized in that: The focal length of the large objective lens group is f1, the focal length of the front fixed group is f2, the focal length of the zoom group is f3, the focal length of the compensation group is f5, the focal length of the rear fixed group is f6, and the focal length of the zoom lens at the long working distance and wide-angle end is f; wherein, -231.271≤f1 / f≤-73.039, 2.795≤f2 / f≤2.854, -1.741≤f3 / f≤-1.736, -1.261≤f5 / f≤-1.257, and 0.885≤f6 / f≤0.
989.
6. The zoom lens for surgical exoscope according to claim 5, characterized in that: The aperture is arranged between the tenth lens and the eleventh lens, the distance from the aperture to the image plane is L, the total optical length of the zoom lens is TTL, wherein 0.365≤L / TTL≤0.
389.
7. The zoom lens for surgical exoscope according to claim 6, characterized in that: The moving components of each imaging optical path are the zoom group and the compensation group, and the fixed components are the front fixed group and the rear fixed group; wherein the movement only involves the overall movement of the components, and does not involve the movement of the lenses and the flat glass, and the fixation refers to the overall fixation of the components, the glass included in the components, and the flat glass; when the large objective lens group changes magnification at the same working distance, the relative position and absolute position of each lens do not change; when the large objective lens group changes the working distance, the third lens, the fourth lens, and the fifth lens move backward as a whole, and the distance between the second lens and the third lens, and the distance between the fifth lens and the rear group of flat glass change.
8. The zoom lens for surgical exoscope according to claim 7, characterized in that: The zoom lens satisfies the following conditions: 0.163≤S1 / TTL≤0.165, 0.080≤S2 / TTL≤0.082, 0.070≤S3 / TTL≤0.072, wherein S1 is the relative displacement of the zoom group when the zoom lens is at the wide-angle end position and when the zoom lens is at the telephoto end position, S2 is the relative displacement of the compensation group when the zoom lens is at the wide-angle end position and when the zoom lens is at the telephoto end position, S3 is the relative displacement of the third lens, the fourth lens and the fifth lens in the large lens group as a whole when the zoom lens is at the long working distance position and when the zoom lens is at the short working distance position, and TTL is the total optical length of the zoom lens.
9. The zoom lens for surgical exoscope according to claim 7, characterized in that: The zooming method of the zoom lens is as follows: during the zooming process at the same working distance, the change in the conjugate distance of the moving component arranged in the imaging optical path is zero, the image plane remains stable and the size remains unchanged, the large objective lens group, the front fixed group and the rear fixed group are fixed, the zoom group and the compensation group cooperate with each other to perform mechanical linkage to change the optical magnification; and when the working distance needs to be changed, the distance of the lenses inside the large objective lens group is also controlled.
10. The zoom lens suitable for surgical exoscope according to claim 9, characterized in that: The mechanical linkage method includes a cam mechanism and a four-bar four-rod mechanism; the multiple imaging optical path structures and zoom methods are completely consistent; the multiple imaging optical paths are distributed in a circular array along the optical axis of the large objective lens group; the optical axes of two adjacent imaging optical paths are ≥25mm apart; the multiple imaging optical paths can be used for ICG fluorescence imaging, blue light imaging, and narrow-band imaging; the zoom lens 5.1≤F number≤11.0.