Binocular lens and surgical equipment

Abstract

The invention relates to a binocular lens and surgical equipment. The binocular lens comprises a first lens group and two light paths which have the same structure and are symmetrically distributed about the center of the binocular lens; each of the two light paths comprises a second lens group, a third lens group and an imaging lens group which are sequentially arranged from the object side to the image side; the reflected light of the object side enters the first lens group, then enters the two light paths respectively, and is imaged at the imaging lens group of each light path; the focal length of the binocular lens and the total optical length of the binocular lens meet the following relational expression: # imgabs0 #, f is the total focal length of the binocular lens, and TTL is the total optical length of the binocular lens. By adopting the method, the problem that an existing binocular zoom lens cannot realize binocular convergence can be solved.

Description

Technical Field

[0001] The present application relates to the field of optical technology, and in particular to a binocular lens and a surgical device. Background Art

[0002] With the development of optical technology, optical technology has been widely used in the medical field. For example, optical technology can be applied to in vitro surgical equipment such as brain craniotomy equipment or spinal surgery equipment. As the demand for the application of optical technology in in vitro surgical equipment increases, the supporting equipment for optical lenses is becoming increasingly complex. In order to better perceive depth information and accurately locate the location of lesions, the requirements for optical lenses in in vitro surgical equipment have developed from monocular and fixed focus to binocular and zoom.

[0003] The existing binocular zoom lens mainly adopts two optical paths with the same structure and symmetrical distribution of the center. The light of each optical path is emitted after passing through the lens of the same structure. Therefore, the emitted light is two parallel lights, which cannot achieve binocular convergence.

[0004] With regard to the problem that existing binocular zoom lenses cannot achieve binocular convergence, no effective solution has been proposed so far. Summary of the invention

[0005] Based on this, it is necessary to provide a binocular lens and a surgical device to address the above technical problems.

[0006] In a first aspect, the present application provides a binocular lens, comprising a first lens group and two optical paths having the same structure and symmetrically distributed about the center of the binocular lens;

[0007] Each of the two optical paths includes a second lens group, a third lens group and an imaging lens group, which are arranged in sequence from the object side to the image side;

[0008] After the reflected light from the object side enters the first lens group, it enters the two optical paths respectively and forms an image at the imaging lens group of each optical path;

[0009] The focal length of the binocular lens and the total optical length of the binocular lens satisfy the following relationship:

[0010]

[0011] Wherein, f is the total focal length of the binocular lens, and TTL is the total optical length of the binocular lens.

[0012] In one embodiment, the first lens group includes a first lens, a second lens, a third lens and a fourth lens arranged in sequence along the incident direction of light;

[0013] The second lens group includes a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens and a twelfth lens arranged in sequence along the incident direction of light;

[0014] The third lens group includes a thirteenth lens, a fourteenth lens and a fifteenth lens arranged in sequence along the incident direction of light;

[0015] The first lens, the fourth lens, the fifth lens and the twelfth lens are meniscus lenses with negative optical power; the third lens, the eighth lens, the ninth lens and the eleventh lens are meniscus lenses with positive optical power; the second lens, the sixth lens and the fifteenth lens are biconvex lenses with positive optical power; the seventh lens, the tenth lens and the fourteenth lens are biconcave lenses with negative optical power; the thirteenth lens is a plano-convex lens with positive optical power.

[0016] In one embodiment, the first lens and the second lens are closely connected to form a first cemented lens group; the third lens and the fourth lens are closely connected to form a second cemented lens group; the fifth lens and the sixth lens are closely connected to form a third cemented lens group; the seventh lens and the eighth lens are closely connected to form a fourth cemented lens group; the ninth lens and the tenth lens are closely connected to form a fifth cemented lens group; and the eleventh lens and the twelfth lens are closely connected to form a sixth cemented lens group.

[0017] In one embodiment, the third cemented lens group, the fourth cemented lens group, the fifth cemented lens group and the sixth cemented lens group satisfy the following relationship:

[0018]

[0019] Wherein, FOV is the field of view of the binocular lens, f G1 is the focal length of the first lens group, f D3 is the focal length of the third cemented lens group, f D4 is the focal length of the fourth cemented lens group, f D5 is the focal length of the fifth cemented lens group, f D6 is the focal length of the sixth cemented lens group.

[0020] In one embodiment, a surface of the third lens close to the object side is concave, and a surface close to the image side is convex; and the second lens and the third lens satisfy the following relationship:

[0021]

[0022] Wherein, R3 is the central curvature radius of the third lens close to the object side, and R2 is the central curvature radius of the second lens close to the image side.

[0023] In one embodiment, the third lens, the eighth lens and the thirteenth lens meet the following conditions:

[0024] f3 ≥ 128;

[0025] f8≥18;

[0026] f 13 ≥13;

[0027] Wherein, f3 is the focal length of the third lens, f8 is the focal length of the eighth lens, and f 13 is the focal length of the thirteenth lens.

[0028] In one embodiment, the tenth lens and the twelfth lens satisfy the following conditions:

[0029] Vd 10 ≥28.1;

[0030] Vd 12 ≥33.0;

[0031] Among them, Vd 10 is the Abbe number of the glass material of the tenth lens, Vd 12 is the Abbe number of the glass material of the twelfth lens.

[0032] In one embodiment, the fourth lens, the seventh lens and the thirteenth lens meet the following conditions:

[0033] Nd4≥1.61;

[0034] Nd7≥1.58;

[0035] Nd 13 ≥1.50;

[0036] Wherein, Nd4 is the refractive index of the glass material of the fourth lens, Nd7 is the refractive index of the glass material of the seventh lens, and Nd 13 is the refractive index of the glass material of the thirteenth lens.

[0037] In one embodiment, the second lens group and the third lens group constitute a rear zoom system, and the range of optical axis eccentricity between the rear zoom system and the first lens group is [-10mm, 10mm].

[0038] In one embodiment, it also includes:

[0039] An aperture stop is disposed between the second lens group and the third lens group.

[0040] In one of the embodiments, along the incident direction of light, a flat glass group and a color filter group are sequentially arranged after the third lens group and before the imaging lens group.

[0041] In one embodiment, along the incident direction of light, a prism group and a color filter group are sequentially arranged after the third lens group and before the imaging lens group.

[0042] In one of the embodiments, a reflective component is also included;

[0043] The reflective assembly is located between the second lens group and the third lens group.

[0044] In a second aspect, the present application also provides a surgical device. The surgical device includes a movable trolley;

[0045] The movable trolley is provided with a monitor, a control touch screen and a supporting arm;

[0046] The end of the support arm is connected to the binocular lens described in the first aspect above; the binocular lens moves along with the end of the support arm;

[0047] The monitor is used to display the imaging data of the binocular lens;

[0048] The control touch screen generates a control instruction in response to a touch operation of a user, so as to control the movement of the support arm.

[0049] The binocular lens and a surgical device described above, the binocular lens includes a first lens group and two optical paths with the same structure and symmetrically distributed around the center of the binocular lens; each of the two optical paths includes a second lens group, a third lens group and an imaging lens group, which are arranged in sequence from the object side to the image side; after the reflected light from the object side enters the first lens group, it enters the two optical paths respectively, and forms an image at the imaging lens group of each optical path, and the first lens group (common objective lens) is used to achieve dual optical path convergence, and the second lens group and the third lens group are used to perform zooming, so as to achieve high-resolution imaging of the binocular lens while achieving binocular convergence and observation over a wide field of view. In terms of optical path design, it is realized that at an effective working distance, light convergence can be achieved on a target plane, point or block, not just at a fixed distance, and on the premise of achieving light convergence, clear imaging can be achieved at the optimal position. It can solve the problem that the existing binocular zoom lens cannot achieve binocular convergence.

[0050] Details of one or more embodiments of the present application are set forth in the following drawings and description to make other features, objects, and advantages of the present application more readily apparent. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0052] Figure 1 A structural block diagram of a binocular lens provided in one embodiment of the present application;

[0053] Figure 2 A schematic diagram of the structure of the binocular lens provided in Example 1 of the present application;

[0054] Figure 3 A schematic diagram of the structure of a binocular lens provided in Example 2 of the present application;

[0055] Figure 4 A schematic diagram of the structure of a binocular lens provided in Example 3 of the present application;

[0056] Figure 5A A schematic diagram of the structure of the binocular lens in a wide-angle state provided in Embodiment 4 of the present application;

[0057] Figure 5B A schematic diagram of the structure of the binocular lens in the telephoto state provided in the fourth embodiment of the present application;

[0058] Figure 6 A schematic diagram of the structure of a binocular lens provided in Example 5 of the present application;

[0059] Fig. 7A A schematic diagram of the optical transfer function of a binocular lens at a wide angle end provided in an embodiment of the present application;

[0060] Figure 7B A schematic diagram of the optical transfer function of a binocular lens at the telephoto end provided by an embodiment of the present application;

[0061] Fig. 8A A schematic diagram of the field curvature of a binocular lens at a wide angle end provided in an embodiment of the present application;

[0062] Figure 8B A schematic diagram of the distortion of a binocular lens at a wide angle end provided in an embodiment of the present application;

[0063] Figure 8C A schematic diagram of the field curvature of a binocular lens at the telephoto end provided in an embodiment of the present application;

[0064] Fig.8D A schematic diagram of the distortion of a binocular lens at the telephoto end provided in an embodiment of the present application;

[0065] Fig.9A A schematic diagram of a lateral light fan of a binocular lens in a first field of view provided by an embodiment of the present application;

[0066] Fig. 9B A schematic diagram of a lateral light fan of a binocular lens provided in an embodiment of the present application under a second normal field of view;

[0067] Fig. 9C A schematic diagram of a lateral light fan of a binocular lens in a third normal field of view provided by an embodiment of the present application;

[0068] Fig.9D A schematic diagram of a lateral light fan of a binocular lens provided in an embodiment of the present application under a second negative field of view;

[0069] Fig.9E A schematic diagram of a lateral light fan of a binocular lens provided in an embodiment of the present application under a third negative field of view;

[0070] Fig.10 A schematic diagram of the structure of a surgical device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0071] In order to more clearly understand the purpose, technical solutions and advantages of the present application, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments.

[0072] Unless otherwise defined, the technical terms or scientific terms involved in this application shall have the general meaning understood by people with ordinary skills in the technical field to which this application belongs. The words "one", "a", "a", "the", "these" and the like in this application do not represent quantitative restrictions, and they can be singular or plural. The terms "include", "comprise", "have" and any variants thereof involved in this application are intended to cover non-exclusive inclusions; for example, a process, method and system, product or device comprising a series of steps or modules (units) is not limited to the listed steps or modules (units), but may include unlisted steps or modules (units), or may include other steps or modules (units) inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether directly or indirectly. The "multiple" involved in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, "A and / or B" can mean: A exists alone, A and B exist at the same time, and B exists alone. Usually, the character " / " indicates that the objects associated with each other are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific ordering of the objects.

[0073] In this embodiment, a binocular lens is provided. Figure 1: is a structural block diagram of a binocular lens of this embodiment. Figure 1 As shown, the binocular lens comprises a first lens group 110 and two optical paths with the same structure and symmetrically distributed around the center of the binocular lens; each of the two optical paths comprises a second lens group 120, a third lens group 130 and an imaging lens group 140, which are arranged in sequence from the object side to the image side; after the reflected light from the object side enters the first lens group 110, it enters the two optical paths respectively and forms an image at the imaging lens group 140 of each optical path.

[0074] The first lens group 110, the second lens group 120 and the third lens group 130 are all composed of a plurality of lenses. The imaging lens group 140 may be composed of one or more imaging lenses.

[0075] In this embodiment, the first lens group 110, as the front end common objective lens of the binocular lens, can realize the two-way convergence function of light. The second lens group 120 and the third lens group 130 can be used as a zoom system, which can adjust the focal length, thickness, etc. of the lenses in the second lens group 120 and the third lens group 130 to perform zooming of the binocular lens, and can realize high-resolution imaging of the binocular lens while achieving binocular convergence and observation over a wide field of view.

[0076] The focal length of the binocular lens and the total optical length of the binocular lens satisfy the following relationship:

[0077]

[0078] Among them, f is the total focal length of the binocular lens, and TTL is the total optical length of the binocular lens.

[0079] The total optical length of the binocular lens is the distance between the first lens (first lens) of the first lens group 110 and the last lens of the imaging lens group 140 .

[0080] This embodiment uses the first lens group (common objective lens) to achieve dual light path convergence, and uses the second lens group and the third lens group to zoom, so as to achieve high-resolution imaging of the binocular lens while achieving binocular convergence and observation over a wide field of view. In terms of optical path design, it is possible to achieve light convergence on the target plane, point or block at an effective working distance, not just convergence at a fixed distance, and on the premise of achieving light convergence, it can clearly image the best position. Moreover, when light is incident at a certain angle (±2°), clear imaging can also be guaranteed.

[0081] in, Figure 2 Schematic diagram of the structure of the binocular lens provided in Example 1 of the present application. Figure 2As shown, the first lens group 110 is provided with a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4 in sequence along the incident direction of light; the second lens group 120 is provided with a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, a tenth lens L10, an eleventh lens L11 and a twelfth lens L12 in sequence along the incident direction of light; the third lens group 130 is provided with a thirteenth lens L13, a fourteenth lens L14 in sequence along the incident direction of light , the fifteenth lens L15; the first lens L1, the fourth lens L4, the fifth lens L5 and the twelfth lens L12 are meniscus lenses with negative focal power; the third lens L3, the eighth lens L8, the ninth lens L9 and the eleventh lens L11 are meniscus lenses with positive focal power; the second lens L2, the sixth lens L6 and the fifteenth lens L15 are biconvex lenses with positive focal power; the seventh lens L7, the tenth lens L10 and the fourteenth lens L14 are biconcave lenses with negative focal power; the thirteenth lens L13 is a plano-convex lens with positive focal power.

[0082] Specifically, in one embodiment, continue to see Figure 2 , the first lens and the second lens are closely connected to form a first cemented lens group; the third lens and the fourth lens are closely connected to form a second cemented lens group; the fifth lens L5 and the sixth lens L6 are closely connected to form a third cemented lens group; the seventh lens L7 and the eighth lens L8 are closely connected to form a fourth cemented lens group; the ninth lens L9 and the tenth lens L10 are closely connected to form a fifth cemented lens group; the eleventh lens L11 and the twelfth lens L12 are closely connected to form a sixth cemented lens group.

[0083] In addition, in one embodiment, the third cemented lens group, the fourth cemented lens group, the fifth cemented lens group and the sixth cemented lens group satisfy the following relationship:

[0084]

[0085] Among them, FOV is the field of view of the binocular lens, f G1 is the focal length of the first lens group 110, f D3 is the focal length of the third cemented lens group, f D4 is the focal length of the fourth cemented lens group, f D5 is the focal length of the fifth cemented lens group, f D6 is the focal length of the sixth cemented lens group.

[0086] In one embodiment, a surface of the third lens L3 close to the object side is concave, and a surface close to the image side is convex; and the second lens L2 and the third lens L3 satisfy the following relationship:

[0087]

[0088] Wherein, R3 is the central curvature radius of the third lens L3 close to the object side, and R2 is the central curvature radius of the second lens L2 close to the image side.

[0089] In addition, in one embodiment, the third lens L3, the eighth lens L8 and the thirteenth lens L13 satisfy the following conditions:

[0090] f3 ≥ 128;

[0091] f8≥18;

[0092] f 13 ≥13;

[0093] Wherein, f3 is the focal length of the third lens L3, f8 is the focal length of the eighth lens L8, and f 13 is the focal length of the thirteenth lens L13.

[0094] It should be noted that the length unit of the focal length in this embodiment is mm.

[0095] Further, in one embodiment, the tenth lens L10 and the twelfth lens L12 satisfy the following conditions:

[0096] Vd 10 ≥28.1;

[0097] Vd 12 ≥33.0;

[0098] Among them, Vd 10 is the Abbe number of the glass material of the tenth lens L10, Vd 12 is the Abbe number of the glass material of the twelfth lens L12.

[0099] Specifically, in one embodiment, the fourth lens L4, the seventh lens L7 and the thirteenth lens L13 satisfy the following conditions:

[0100] Nd4≥1.61;

[0101] Nd7≥1.58;

[0102] Nd 13 ≥1.50;

[0103] Wherein, Nd4 is the refractive index of the glass material of the fourth lens L4, Nd7 is the refractive index of the glass material of the seventh lens L7, and Nd 13 is the refractive index of the glass material of the thirteenth lens L13.

[0104] Furthermore, in one embodiment, the rear zoom system formed by the second lens group 120 and the third lens group 130 has an optical axis eccentricity range of [-10 mm, 10 mm] between the rear zoom system and the first lens group 110 .

[0105] In addition, the binocular lens provided in the second embodiment of the present application is based on the first embodiment of the present application, with an additional aperture stop. Figure 3 Schematic diagram of the structure of the binocular lens provided in Example 2 of the present application. Figure 3 As shown, an aperture stop 180 is disposed between the second lens group 120 and the third lens group 130 .

[0106] Furthermore, the binocular lens provided in the third embodiment of the present application is based on the second embodiment of the present application, and a flat glass group and a color filter group are added. Figure 4 Schematic diagram of the structure of the binocular lens provided in Example 3 of the present application. Figure 4 As shown, along the incident direction of light, after the third lens group and before the imaging lens group 140, a flat glass group 150 and a color filter group 160 are sequentially arranged.

[0107] The above-mentioned flat glass group may include one or more flat glass. The above-mentioned color filter group may include one or more color filters.

[0108] In addition, based on the binocular lens of the third embodiment of the present application, in order to achieve the effect of light splitting, a prism can be used to replace the flat glass. Figure 5A and Figure 5B 1 is a schematic diagram of the structure of the binocular lens in different states provided in the fourth embodiment of the present application. Figure 5A 1 is a schematic diagram of the structure of the binocular lens in a wide-angle state provided in Embodiment 4 of the present application; Figure 5B Schematic diagram of the structure of the binocular lens in the telephoto state provided by the fourth embodiment of the present application. Figure 5A and Figure 5B As shown, along the incident direction of light, a prism group 170 and a color filter group 160 are sequentially arranged after the third lens group 130 and before the imaging lens group 140 .

[0109] Preferably, in one embodiment, the binocular lens further includes a reflective component; the reflective component is located between the second lens group 120 and the third lens group 130 .

[0110] The above-mentioned reflective component may include one or more reflectors, and the reflectors are used to reflect the light to achieve a change in the light path. In addition, the above-mentioned reflective component may also be a reflector or a dichroic prism. This embodiment does not make any specific limitations here, as long as the reflective component can be used to achieve the change of the light path according to the needs. This embodiment achieves the change of the light path of the binocular lens by setting a reflective component. It should be noted that when the light path changes, the light path is no longer a straight line, and the total optical length of the binocular lens is the length of the light propagation distance between the first lens (first lens L1) of the first lens group 110 and the imaging mirror.

[0111] Figure 6 This is a schematic diagram of the structure of the binocular lens provided in Example 5 of the present application, as shown in Figure 6 As shown, a reflective assembly 190 is disposed between the second lens group 120 and the third lens group 130. The reflective assembly includes a first reflector 192, a second reflector 194, a third reflector 196 and a fourth reflector 198. Figure 6 The prism group 170 can divide the received light into two paths. In this embodiment, the rear end of the lens design can be expanded by adding a reflective component to expand the two-way space and shorten the overall size, and can realize multi-image observation and multi-angle observation, which is highly practical and flexible.

[0112] In addition, in one embodiment, the first lens L1, the fifth lens L5 and the eighth lens L8 are lenses whose surfaces close to the object side are convex and whose surfaces close to the image side are concave; the fourth lens L4, the ninth lens L9, the eleventh lens L11 and the twelfth lens L12 are lenses whose surfaces close to the object side are concave and whose surfaces close to the image side are convex; and the thirteenth lens L13 has a convex surface on the side close to the object plane.

[0113] It should be noted that the diameter range of the detection field of the binocular lens provided in this embodiment is between 8mm and 48mm. In telephoto mode, the diameter of the detection field of the binocular lens is about 8mm, and the optical distortion of the telephoto lens is within 1.2%. In wide-angle mode, the diameter of the detection field of the binocular lens is about 48mm, and the optical distortion of the wide-angle lens is within 1.0%, which can achieve six times optical zoom. The above-mentioned binocular lens can distinguish a line width of 7um at high resolution, has good imaging performance, and has small distortion. The above-mentioned binocular device also accepts light within ±2° of the emitted light without restriction, which solves the limitation of 0° parallel light emission. In addition, this binocular lens has stable optical performance and can work normally in the range of -10°C to +50°C, meeting the requirements of working in the above temperature range. In addition, the detection depth range of the above-mentioned binocular lens is: 250mm±50mm. The above-mentioned detection depth range may refer to the working range of the detection, and specifically may refer to the range of the distance between the first lens and the target object.

[0114] In one example, see Figure 4 The curvature radius R and center thickness T of each lens of the binocular lens are c , refractive index Nd, and Abbe constant Vd can be as shown in Table 1 below:

[0115] Table 1

[0116]

[0117] As shown in Table 1, the first bonding surface is a bonding surface formed by the first lens and the second lens, the second bonding surface is a bonding surface formed by the third lens and the fourth lens, the third bonding surface is a bonding surface formed by the fifth lens and the sixth lens, the fourth bonding surface is a bonding surface formed by the seventh lens and the eighth lens, the fifth bonding surface is a bonding surface formed by the ninth lens and the tenth lens, and the sixth bonding surface is a bonding surface formed by the eleventh lens and the twelfth lens. The imaging surface may be an image surface, or may be a sensor so that an image can be imaged on the sensor, that is, the sensor is used to simulate the imaging of the human eye under visual conditions.

[0118] As shown in Table 1, in this embodiment, the total focal length of the binocular lens, the field of view of the binocular lens, the focal length of the first lens group 110, the focal length of the third cemented lens group, the focal length of the fourth cemented lens group, the focal length of the fifth cemented lens group, and the focal length of the sixth cemented lens group are related in the wide-angle mode as follows:

[0119]

[0120] In telephoto mode the relationship is:

[0121]

[0122] Satisfies the following relationship:

[0123]

[0124] In wide-angle mode the relationship is:

[0125]

[0126] In telephoto mode the relationship is:

[0127]

[0128] Satisfies the following relationship:

[0129]

[0130] The relationship between the focal length of the binocular lens and the total optical length of the binocular lens in wide-angle mode is:

[0131]

[0132] The relationship between the focal length of the binocular lens and the total optical length of the binocular lens in telephoto mode is:

[0133]

[0134] Satisfies the following relationship:

[0135]

[0136] The relationship between the second lens L2 and the third lens L3 satisfies the following relationship:

[0137]

[0138] The focal length of the third lens L3 in the binocular lens is 128.48, the focal length of the eighth lens L8 is 20.11, and the focal length of the thirteenth lens L13 is 28.59. The following conditions are met:

[0139] f3 ≥ 128;

[0140] f8≥18;

[0141] f 13 ≥13;

[0142] The Abbe number of the glass material of the tenth lens L10 in the binocular lens is 59.73, and the Abbe number of the glass material of the twelfth lens L12 is 35.92. The following conditions are met:

[0143] Vd 10 ≥28.1;

[0144] Vd 12 ≥33.0;

[0145] The refractive index of the glass material of the fourth lens L4 in the binocular lens is 1.80, the refractive index of the glass material of the seventh lens L7 is 1.58, and the refractive index of the glass material of the thirteenth lens L13 is 1.75. The following conditions are met:

[0146] Nd4≥1.61;

[0147] Nd7≥1.58;

[0148] Nd 13 ≥1.50;

[0149] In another example, see Figure 4 The curvature radius R and center thickness T of each lens of the binocular lens are c , refractive index Nd, and Abbe constant Vd can be as shown in Table 2 below:

[0150] Table 2

[0151]

[0152] As shown in Table 2, in this embodiment, the total focal length of the binocular lens, the field of view of the binocular lens, the focal length of the first lens group 110, the focal length of the third cemented lens group, the focal length of the fourth cemented lens group, the focal length of the fifth cemented lens group, and the focal length of the sixth cemented lens group, in the wide-angle mode, are related as follows:

[0153]

[0154] In telephoto mode the relationship is:

[0155]

[0156] Satisfies the following relationship:

[0157]

[0158] In wide-angle mode the relationship is:

[0159]

[0160] In telephoto mode the relationship is:

[0161]

[0162] Satisfies the following relationship:

[0163]

[0164] The relationship between the focal length of the binocular lens and the total optical length of the binocular lens in wide-angle mode is:

[0165]

[0166] The relationship between the focal length of the binocular lens and the total optical length of the binocular lens in telephoto mode is:

[0167]

[0168] Satisfies the following relationship:

[0169]

[0170] The relationship between the second lens L2 and the third lens L3 satisfies the following relationship:

[0171]

[0172] The focal length of the third lens L3 in the binocular lens is 138.6, the focal length of the eighth lens L8 is 294.5, and the focal length of the thirteenth lens L13 is 26.3. The following conditions are met:

[0173] f3 ≥ 128;

[0174] f8≥18;

[0175] f 13 ≥13;

[0176] The Abbe number of the glass material of the tenth lens L10 in the binocular lens is 60.47, and the Abbe number of the glass material of the twelfth lens L12 is 35.69. The following conditions are met:

[0177] Vd 10 ≥28.1;

[0178] Vd 12 ≥33.0;

[0179] The refractive index of the glass material of the fourth lens L4 in the binocular lens is 1.784, the refractive index of the glass material of the seventh lens L7 is 1.603, and the refractive index of the glass material of the thirteenth lens L13 is 1.569. The following conditions are met:

[0180] Nd4≥1.61;

[0181] Nd7≥1.58;

[0182] Nd 13 ≥1.50;

[0183] In the embodiments of the present application, the limiting conditions of the above parameters can be obtained based on experiments or based on the limiting conditions of the device itself.

[0184] Generally speaking, the optical transfer function is a relatively accurate, intuitive and common way to evaluate the imaging quality of an imaging system. The higher and smoother the curve is, the better the imaging quality of the system is, and various aberrations (such as spherical aberration, coma, astigmatism, field curvature, axial chromatic aberration, vertical chromatic aberration, etc.) are well corrected.

[0185] Fig. 7A , Figure 7B Schematic diagram of the optical transfer function of the binocular lens at the wide-angle end and the telephoto end provided by an embodiment of the present application. Fig. 7A is a schematic diagram of the optical transfer function of the wide-angle end of the binocular lens, such as Fig. 7A As shown, the horizontal axis is the spatial frequency, the unit is lp / mm, and the vertical axis is the transfer function; Figure 7B The figure is a schematic diagram of the optical transfer function of the telephoto end of the binocular lens. The optical transfer function of the binocular lens at room temperature in the visible light band is a curve graph. It can be seen that the optical transfer function (MTF, Modulation Transfer Function) curve of the binocular lens at room temperature in the visible light part is smoother and more concentrated, and can resolve a minimum line width of 7um at high magnification, which can meet higher imaging requirements, where T represents the meridian plane and S represents the sagittal plane.

[0186] Fig. 8A , Figure 8B , Figure 8C , Fig.8D Schematic diagram of field curvature and distortion of a binocular lens at a wide-angle end and a telephoto end provided by an embodiment of the present application. Fig. 8A This is a schematic diagram of the field curvature of the binocular lens at the wide-angle end. Figure 8B This is a schematic diagram of the distortion of the binocular lens at the wide-angle end. Figure 8C This is a schematic diagram of the field curvature of the binocular lens at the telephoto end. Fig.8D This is a schematic diagram of the distortion of the binocular lens at the telephoto end. The field curvature of the binocular lens is controlled within ±0.8mm. Field curvature is also called "image curvature". When the lens has field curvature, the intersection of the entire light beam does not coincide with the ideal image point. Although a clear image point can be obtained at each specific point, the entire image plane is a curved surface. The field curvature curve shows the distance from the current focal plane or image plane to the paraxial focal plane as a function of the field of view coordinates. The meridional field curvature data is measured along the Z axis (optical axis direction), the distance from the currently determined focal plane to the paraxial focal plane, and is measured on the meridian (YZ) plane. The sagittal field curvature data measures the distance measured on a plane perpendicular to the meridian plane. The baseline in the schematic diagram is on the optical axis, and the top of the curve represents the maximum field of view (angle or height). No unit is set on the vertical axis because the curve is always normalized with the maximum radial field of view.

[0187] Based on Figure 8, it can be seen that the distortion of the binocular lens is within ±2%. Figure 8 refers to the distortion curves of multiple wavelengths (such as: 0.486um, 0.546um and 0.656um), and the curves overlap in Figure 8. Generally speaking, lens distortion is actually a general term for the inherent perspective distortion of optical lenses, that is, the distortion caused by perspective. This distortion is very detrimental to the imaging quality of the photo, but because it is an inherent characteristic of the lens (convex lenses converge light and concave lenses diverge light), it cannot be eliminated and can only be improved. As can be seen from Figure 8, the distortion of the binocular lens provided in Table 1 or Table 2 of this application is -1.0% at the wide-angle end and -1.2% at the telephoto end; the distortion is set in this way to balance the focal length, field of view angle and the size of the corresponding camera target surface, and the deformation caused by the distortion can be corrected by post-image processing.

[0188] Fig.9A , Fig. 9B , Fig. 9C , Fig.9D , Fig.9E Schematic diagram of the lateral light fan of the binocular lens under different fields of view provided by an embodiment of the present application. Fig.9A is a schematic diagram of the lateral light fan of the binocular lens in the first field of view, Fig.9AAs shown, the first field of view may be the field of view corresponding to “image plane: 0.000mm”, and “image plane: 0.000mm” means that in the first field of view (0 field of view), the intersection height of the main light and the imaging plane is 0.000mm; Fig. 9B Schematic diagram of the lateral light fan of the binocular lens in the second normal field of view. The second normal field of view may be the field of view corresponding to “image plane: 1.000mm”. “Image plane: 1.000mm” means that in the second normal field of view, the intersection height of the chief light ray and the imaging plane is 1.000mm; Fig. 9C Schematic diagram of the lateral light fan of the binocular lens in the third normal field of view. The third normal field of view may be the field of view corresponding to “image plane: 2.000mm”. “Image plane: 2.000mm” means that in the third normal field of view, the intersection height of the chief ray and the imaging plane is 2.000mm; Fig.9D Schematic diagram of the lateral light fan of the binocular lens under the second negative field of view. The above-mentioned second negative field of view may be the field of view corresponding to "image plane: -1.000mm", and "image plane: -1.000mm" means that under the second negative field of view, the intersection height of the main light ray and the imaging plane is -1.000mm; Fig.9E This is a schematic diagram of the lateral light fan of the binocular lens in the third negative field of view. The above third negative field of view can be the field of view corresponding to "image plane: -2.000mm". "Image plane: -2.000mm" means that in the third negative field of view, the intersection height of the main light ray and the imaging plane is -2.000mm. As shown in the figure, ex and ey refer to the difference between the height of the light on a specific pupil in the current field of view light fan incident on the imaging plane and the height of the main light of the current field of view on the imaging plane. Py represents the pupil coordinates on the meridian light fan; px represents the pupil coordinates on the sagittal light fan. And in each field of view, the light fan diagrams appear in pairs. It can be seen from the above figure that the curve is relatively concentrated, and the spherical aberration and dispersion are also well controlled.

[0189] Fig.10 A schematic diagram of the structure of a surgical device provided in one embodiment of the present application is shown in FIG. Fig.10 As shown, the surgical device includes a movable trolley; a monitor, a control touch screen and a support arm are arranged on the movable trolley; the end of the support arm is connected to the binocular lens in any of the above embodiments; the binocular lens moves with the end of the support arm; the monitor is used to display the imaging data of the binocular lens; the control touch screen generates a control instruction in response to the user's touch operation to control the movement of the support arm.

[0190] The monitor is also provided with a monitor bracket.

[0191] Based on the same inventive concept, the present embodiment also provides a control system for surgical equipment, the system comprising a monitoring module, a data processing module, and a data acquisition module; the monitoring module is used to monitor the video data collected by the data acquisition module; the data processing module is used to generate a data acquisition command and send the data acquisition command to the data acquisition module; the data acquisition module comprises the binocular lens and fill light unit of any of the above embodiments; the fill light unit performs synchronous fill light on the binocular lens based on the received data acquisition command; the binocular lens is used to collect data on the target area in response to the received data acquisition command to obtain video data.

[0192] It should be noted that the specific examples in this embodiment can refer to the examples described in the above embodiments and optional implementation modes, and will not be repeated in this embodiment.

[0193] It should be understood that the specific embodiments described herein are only used to explain the application, rather than to limit it. Based on the embodiments provided in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of this application.

[0194] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties.

[0195] Obviously, the drawings are only some examples or embodiments of the present application. For ordinary technicians in the field, the present application can also be applied to other similar situations based on these drawings without creative work. In addition, it is understandable that although the work done in this development process may be complicated and lengthy, for ordinary technicians in the field, certain changes in design, manufacturing or production based on the technical content disclosed in this application are only conventional technical means and should not be regarded as insufficient content disclosed in this application.

[0196] The term "embodiment" in this application refers to a specific feature, structure or characteristic described in conjunction with the embodiment that can be included in at least one embodiment of the present application. The appearance of this phrase in various locations in the specification does not necessarily mean the same embodiment, nor does it mean that it is mutually exclusive with other embodiments and is independent or optional. It is clearly or implicitly understood by those of ordinary skill in the art that the embodiments described in this application can be combined with other embodiments without conflict.

[0197] The above-mentioned 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 patent protection. 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 scope of protection of the present application. Therefore, the scope of protection of the present application shall be subject to the attached claims.

Claims

1. A binocular lens, characterized in that: It includes a first lens group and two optical paths with the same structure and symmetrically distributed around the center of the binocular lens; Each of the two optical paths includes a second lens group, a third lens group and an imaging lens group, which are arranged in sequence from the object side to the image side; After the reflected light from the object side enters the first lens group, it enters the two optical paths respectively and forms an image at the imaging lens group of each optical path; The focal length of the binocular lens and the total optical length of the binocular lens satisfy the following relationship: Wherein, f is the total focal length of the binocular lens, and TTL is the total optical length of the binocular lens.

2. The binocular lens according to claim 1, characterized in that: The first lens group includes a first lens, a second lens, a third lens and a fourth lens arranged in sequence along the incident direction of light; The second lens group includes a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens and a twelfth lens arranged in sequence along the incident direction of light; The third lens group includes a thirteenth lens, a fourteenth lens and a fifteenth lens arranged in sequence along the incident direction of light; The first lens, the fourth lens, the fifth lens and the twelfth lens are meniscus lenses with negative optical power; the third lens, the eighth lens, the ninth lens and the eleventh lens are meniscus lenses with positive optical power; the second lens, the sixth lens and the fifteenth lens are biconvex lenses with positive optical power; the seventh lens, the tenth lens and the fourteenth lens are biconcave lenses with negative optical power; the thirteenth lens is a plano-convex lens with positive optical power.

3. The binocular lens according to claim 2, characterized in that: The first lens and the second lens are closely connected to form a first cemented lens group; the third lens and the fourth lens are closely connected to form a second cemented lens group; the fifth lens and the sixth lens are closely connected to form a third cemented lens group; the seventh lens and the eighth lens are closely connected to form a fourth cemented lens group; the ninth lens and the tenth lens are closely connected to form a fifth cemented lens group; the eleventh lens and the twelfth lens are closely connected to form a sixth cemented lens group.

4. The binocular lens according to claim 3, characterized in that: The third glued lens group, the fourth glued lens group, the fifth glued lens group and the sixth glued lens group satisfy the following relationship: Wherein, FOV is the field of view of the binocular lens, f G1 is the focal length of the first lens group, f D3 is the focal length of the third cemented lens group, f D4 is the focal length of the fourth cemented lens group, f D5 is the focal length of the fifth cemented lens group, f D6 is the focal length of the sixth cemented lens group.

5. The binocular lens according to claim 2, characterized in that: The third lens has a concave surface close to the object side and a convex surface close to the image side; and the second lens and the third lens satisfy the following relationship: Wherein, R3 is the central curvature radius of the third lens close to the object side, and R2 is the central curvature radius of the second lens close to the image side.

6. The binocular lens according to claim 2, characterized in that: The third lens, the eighth lens and the thirteenth lens meet the following conditions: f3≥128； f8≥18； f 13 ≥13； Wherein, f3 is the focal length of the third lens, f8 is the focal length of the eighth lens, and f 13 is the focal length of the thirteenth lens.

7. The binocular lens according to claim 2, characterized in that: The tenth lens and the twelfth lens satisfy the following conditions: CEO 10 ≥28.1; CEO 12 ≥33.0; Among them, Vd 10 is the Abbe number of the glass material of the tenth lens, Vd 12 is the Abbe number of the glass material of the twelfth lens.

8. The binocular lens according to claim 2, characterized in that: The fourth lens, the seventh lens and the thirteenth lens meet the following conditions: Nd4≥1.61; Nd7≥1.58; Nd 13 ≥1.50; Wherein, Nd4 is the refractive index of the glass material of the fourth lens, Nd7 is the refractive index of the glass material of the seventh lens, and Nd 13 is the refractive index of the glass material of the thirteenth lens.

9. The binocular lens according to claim 1, characterized in that: The second lens group and the third lens group constitute a rear zoom system, and the range of optical axis eccentricity between the rear zoom system and the first lens group is [-10mm, 10mm].

10. The binocular lens according to any one of claims 1 to 9, characterized in that: Also includes: An aperture stop is disposed between the second lens group and the third lens group.

11. The binocular lens according to any one of claims 1 to 9, characterized in that: Along the incident direction of light, a flat glass group and a color filter group are arranged in sequence after the third lens group and before the imaging lens group.

12. The binocular lens according to any one of claims 1 to 9, characterized in that: Along the incident direction of light, a prism group and a color filter group are arranged in sequence after the third lens group and before the imaging lens group.

13. The binocular lens according to any one of claims 1 to 9, characterized in that: Also includes reflective components; The reflective assembly is located between the second lens group and the third lens group.

14. A surgical device, characterized in that: The surgical equipment includes a movable trolley; The movable trolley is provided with a monitor, a control touch screen and a supporting arm; The end of the support arm is connected to a binocular lens according to any one of claims 1 to 13; the binocular lens moves following the end of the support arm; The monitor is used to display the imaging data of the binocular lens; The control touch screen generates a control instruction in response to a touch operation of a user, so as to control the movement of the support arm.

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