8K ultra-high-definition optical endoscope and imaging system

Abstract

The embodiment of the invention discloses an 8K ultra-high-definition optical endoscope and an imaging system, relates to the technical field of medical instruments, and aims to provide an optical endoscope with higher resolution. The optical endoscope comprises a tube body, an objective lens group and a relay lens group, the objective lens group and the relay lens group are arranged in the tube body, the relay lens group is arranged at the image space of the objective lens group, and a collimation magnifying lens group is arranged at the image space of the relay lens group; wherein the objective lens group is used for imaging an observed object; the relay lens group performs relay transmission on the image formed by the objective lens group; the collimation magnifying lens group amplifies the light spot of the image space of the relay lens group into a parallel collimation light spot, so that the light emergent angle of the relay lens group is consistent with the light incident angle of the pick-up lens, and the size of the parallel collimation light spot formed after amplification is consistent with the size of the entrance pupil of the pick-up lens; and the light emitting side of the relay lens group is the image side of the relay lens group. The embodiment of the invention is suitable for the scene of medical examination and operation through the endoscope.

Description

Technical Field

[0001] The present invention relates to the technical field of medical diagnostic instruments, and in particular to an 8K ultra-high definition optical endoscope and imaging system. Background Art

[0002] Medical diagnostic devices are equipment or instruments that identify various medical conditions of patients and can assist doctors in making accurate and timely diagnoses so that doctors can effectively treat and manage diseases.

[0003] An optical endoscope is a commonly used medical device that can enter the human body through natural channels or small surgical incisions to help doctors diagnose and analyze the condition of lesions and treat diseases. For example, there are gastroscopes, colonoscopes, etc.

[0004] An optical endoscope system is a system formed by combining an optical endoscope with a camera device to facilitate viewing the image of the observed object through a display device. At present, existing optical endoscopes are difficult to meet the clinical ultra-high-definition imaging requirements. Summary of the invention

[0005] In view of this, an embodiment of the present invention provides an optical endoscope and an imaging system with higher resolution.

[0006] To achieve the above purpose, the embodiments of the present invention provide the following technical solutions:

[0007] In a first aspect, an embodiment of the present invention provides an optical endoscope, comprising: a tube body, and an objective lens group and a relay lens group disposed in the tube body, wherein the relay lens group is disposed on the image side of the objective lens group, and a collimating magnifying lens group is disposed on the image side of the relay lens group;

[0008] Wherein, the objective lens group is used to form an image of the object being observed;

[0009] The relay lens group is used to relay the image formed by the objective lens group;

[0010] The collimating magnifying lens group is used to magnify the light spot on the image side of the relay lens group into a parallel collimated light spot, so that the light emission angle of the relay lens group is consistent with the light incident angle of the camera lens, and the size of the parallel collimated light spot formed after magnification is consistent with the size of the entrance pupil of the camera lens; the light emission side of the relay lens group is the image side of the relay lens group.

[0011] According to an implementation of the embodiment of the present invention, the illumination on the image side of the collimating magnifying lens group and the illumination on the object side of the objective lens group satisfy the following relationship:

[0012] ;

[0013] is the image-side illumination, in units of ;

[0014] is the object-side illuminance, in units of ;

[0015] is the transmittance, and its value range is ;

[0016] F is the aperture number, and its value range is .

[0017] According to an implementation of the embodiment of the present invention, the outer diameter of the tube is 10 mm, the outer diameter of the objective lens group is greater than or equal to 5.0 mm, the outer diameter of the relay lens group is greater than or equal to 6.8 mm, the outer diameter of the collimating magnifying lens group is greater than or equal to 7.8 mm and less than or equal to 31 mm, or the outer diameter of the collimating magnifying lens group is greater than 31 mm; or

[0018] The outer diameter of the tube body is 4 mm, the outer diameter of the objective lens group is greater than or equal to 2.2 mm, the outer diameter of the relay lens group is greater than or equal to 3.0 mm, the outer diameter of the collimating magnifying lens group 301 is greater than or equal to 4.8 mm and less than or equal to 31 mm, or the outer diameter of the collimating magnifying lens group is greater than 31 mm.

[0019] According to an implementation of the embodiment of the present invention, the aperture of the objective lens group is 6-6.8 mm, and the aperture of the relay lens group is 7-7.8 mm.

[0020] According to an implementation of an embodiment of the present invention, the tube body includes an inner tube, a middle tube and an outer tube;

[0021] The objective lens group and the relay lens group are arranged in the inner tube, and the outer diameter of the relay lens group is 7 mm;

[0022] The middle tube is sleeved on the outside of the outer tube;

[0023] The outer tube is sleeved on the outside of the middle tube, and an optical fiber is arranged in the cavity between the inner wall of the outer tube and the outer wall of the middle tube.

[0024] According to an implementation of the embodiment of the present invention, the relay mirror group includes an odd-numbered array of rod mirrors, and the odd-numbered array of rod mirrors is at least five groups of rod mirrors.

[0025] According to an implementation of the embodiment of the present invention, the object-side detail resolution of the optical endoscope is 1.0um-2.0um.

[0026] According to an implementation of the embodiment of the present invention, the object-side detail resolution of the optical endoscope is 1.0um, 1.38um, 1.45um, 1.85um, or 2.0um.

[0027] According to an implementation of the embodiment of the present invention, the image-side optical resolution of the optical endoscope is greater than or equal to 250 lp / mm-500 lp / mm.

[0028] According to an implementation of the embodiment of the present invention, the objective lens group adopts a quasi-double Gaussian symmetric system, with an aperture stop placed in the middle and the curvatures of the lenses on both sides bent toward the aperture stop.

[0029] According to an implementation of the embodiment of the present invention, the objective lens group includes an objective lens, a compensation lens, a first cemented lens, a second cemented lens and a third cemented lens;

[0030] The objective lens, the compensation lens, the first cemented lens, the second cemented lens and the third cemented lens are arranged in sequence along the direction from the object side to the image side of the objective lens group;

[0031] When the working outer diameter of the optical endoscope is 10 mm, the combined focal length range of the objective lens group is , ;

[0032] When the working outer diameter of the optical endoscope is 4 mm, the combined focal length range of the objective lens group is , ;

[0033] in, is the focal length of the second cemented lens; is the focal length of the third cemented lens.

[0034] According to an implementation of an embodiment of the present invention, the ratio of the overall focal length of the relay lens assembly to the effective aperture of the object side of the relay lens assembly is .

[0035] According to an implementation of the embodiment of the present invention, the relay mirror group includes an odd number of relay rod mirrors, and each group of rod mirrors includes two triple cemented mirror groups;

[0036] Each triplet lens group includes a first relay lens, a second relay lens and a third relay lens; wherein the first relay lens is glued to the second relay lens, the second relay lens is glued to the third relay lens, the first relay lens and the third relay lens are symmetrical relative to the second relay lens, and the optical parameters of the first relay lens and the third relay lens are consistent.

[0037] According to an implementation of the embodiment of the present invention, the relay lens assembly further includes an aperture stop, and the convex surfaces of the first relay lens and the third relay lens are bent toward the aperture stop.

[0038] According to an implementation of an embodiment of the present invention, when the working outer diameter of the optical endoscope is 10 mm, the overall combination range of the relay lens group is ,and ;

[0039] When the working outer diameter of the optical endoscope is 4 mm, the overall combination range of the relay lens group is

[0040] ,and ;

[0041] in, is the focal length of the first relay lens, is the focal length of the second relay lens.

[0042] According to an implementation method of an embodiment of the present invention, the aperture and the cemented lens group form a double Gauss, magnification symmetrical system.

[0043] According to an implementation of the embodiment of the present invention, the incident numerical aperture NA and the exit numerical aperture ISNA of the relay mirror assembly are equal, and the incident numerical aperture NA and the exit numerical aperture ISNA range .

[0044] According to an implementation of the embodiment of the present invention, the object side of the objective lens is a flat surface, the image side is a concave surface, and the average dispersion , curvature ;

[0045] The object side of the compensation lens is flat, the image side is convex, and the average dispersion , curvature ;

[0046] The first cemented lens is composed of a first lens and a second lens, and the dispersion coefficient satisfies vd3-vd4>10; the object side surface of the first lens is convex, the image side surface is convex, and the ratio of the focal length to the effective aperture of the object side surface is , average dispersion , the curvature of the object side Image side curvature ratio The object side of the second lens is concave, the image side is convex, and the ratio of the focal length to the effective aperture of the object side is , average dispersion , the curvature of the object side The curvature of the image side ratio ;

[0047] The second cemented lens is composed of a third lens and a fourth lens, and the dispersion coefficient satisfies vd6-vd5>20; the object side of the third lens is convex, the image side is concave, and the ratio of the focal length to the effective aperture of the object side is , average dispersion ; Curvature of the side surface The curvature of the image side ratio ; The object side of the fourth lens is convex, the image side is concave, and the ratio of the focal length to the effective aperture of the object side is , average dispersion ; Curvature of the side surface The curvature of the image side ratio ;

[0048] The third cemented lens is composed of a fifth lens and a sixth lens, and the dispersion coefficient satisfies vd7-vd8>12; the object side surface of the fifth lens is convex, the image side surface is concave, and the ratio of the focal length to the effective aperture of the object side surface is , average dispersion ; Curvature of the side surface The curvature of the image side ratio ; The object side surface of the sixth lens is convex, the image side surface is convex, and the ratio of the focal length to the effective aperture of the object side surface is , average dispersion ; Curvature of the side surface The curvature of the image side ratio .

[0049] According to an implementation of an embodiment of the present invention, the collimating magnifying lens group includes: a first collimating magnifying glued lens and a second collimating magnifying glued lens;

[0050] The first collimating magnifying lens is composed of the seventh lens and the eighth lens, and the dispersion coefficient satisfies vd12-vd13>25; the object side of the seventh lens is concave, the image side is convex, and the ratio of the focal length to the effective aperture of the object side is , average dispersion , the curvature of the object side The curvature of the image side ratio ; The object side of the eighth lens is concave, the image side is convex, and the ratio of the focal length to the effective aperture of the object side is , average dispersion , the curvature of the object side The curvature of the image side ratio ;

[0051] The second collimating magnifying doublet is composed of the ninth lens and the tenth lens, and the dispersion coefficient satisfies vd14-vd15>12; the object side surface of the ninth lens is convex, the image side surface is convex, and the ratio of the focal length to the effective aperture of the object side surface is preferably , average dispersion , the curvature of the object side The curvature of the image side ratio The object side surface of the tenth lens is concave, the image side surface is concave, and the ratio of the focal length to the effective aperture of the object side surface is preferably , average dispersion , the curvature of the object side The curvature of the image side ratio .

[0052] In a second aspect, an embodiment of the present invention provides an optical endoscope imaging system, comprising:

[0053] Optical endoscope;

[0054] A camera lens, which is arranged on the image side of the optical endoscope and is used to form a real image of the outgoing light of the optical endoscope at an imaging plane;

[0055] An image sensor, the image sensor being arranged on the image side of the optical endoscope and used for converting light imaged by the optical endoscope at an imaging plane into an electrical signal;

[0056] Wherein, the optical endoscope is the optical endoscope described in any of the aforementioned implementations; the light exit angle of the collimating magnifying lens group is consistent with the light incident angle of the camera lens.

[0057] According to an implementation of the embodiment of the present invention, the object-side detail resolution of the optical endoscope is 0.8-1.5 times the pixel size of the image sensor.

[0058] According to an implementation of the embodiment of the present invention, the camera lens and the collimating magnifying lens assembly are not detachable; or

[0059] The camera lens and the collimating magnifying lens group are detachably connected via a standard connection structure, or detachably connected via a non-standard connection structure.

[0060] According to an implementation of the embodiment of the present invention, the objective lens group, the relay lens group, the collimating magnifying lens group and the camera lens are arranged together in the same lumen to form an integrated design.

[0061] According to an implementation of the embodiment of the present invention, the spot diameter of the light incident port of the camera lens is 1 to 6 times the spot diameter of the light exit port of the collimating magnifier group, and the spot diameter of the light exit port of the collimating magnifier group is 1.5-8 mm.

[0062] According to an implementation of the embodiment of the present invention, the camera lens includes two camera lenses arranged in parallel for 3D imaging; or,

[0063] The camera lens has only one camera lens for 2D imaging.

[0064] According to an implementation of the embodiment of the present invention, the camera lens includes a third camera lens, a fourth camera cemented lens and a fifth camera lens;

[0065] The object side of the third camera lens is convex, the image side is concave, and the ratio of the focal length to the effective aperture of the object side is , average dispersion , the curvature of the object side The curvature of the image side ratio ;

[0066] The fourth camera doublet is composed of the eleventh lens and the twelfth lens, and the dispersion coefficient satisfies vd17-vd18>22; the object side surface of the eleventh lens is concave, the image side surface is concave, and the ratio of the focal length to the effective aperture of the object side surface is , average dispersion , the curvature of the object side The curvature of the image side ratio ; The object side surface of the twelfth lens is convex, the image side surface is convex, and the ratio of the focal length to the effective aperture of the object side surface is , average dispersion , the curvature of the object side The curvature of the image side ratio ;

[0067] The object side surface of the fifth camera lens is concave, the image side surface is convex, and the ratio of the focal length to the effective aperture of the object side surface is , average dispersion ; Curvature of the side surface The curvature of the image side ratio .

[0068] According to an implementation of an embodiment of the present invention, the optical endoscope is an optical endoscope that is convenient for forming an 8K ultra-high-definition image of 7680x4320 pixels.

[0069] In the optical endoscope and imaging system of the embodiment of the present invention, the collimating magnifying lens group amplifies the light spot transmitted by the relay lens group, so as to facilitate the imaging of the camera lens on the high-resolution image sensor, such as forming an ultra-high-definition image of 7680x4320 pixels on an 8K (7680x4320 pixels) image sensor.

[0070] Furthermore, the collimating magnifying lens group amplifies the light spot transmitted by the relay lens group to form a parallel collimated light spot, so that the light emission angle of the relay lens group is consistent with the light incident angle of the camera lens, and the size of the parallel collimated light spot formed after amplification is consistent with the size of the entrance pupil of the camera lens. In this way, the light of the collimated light spot formed on the image side of the relay lens group can completely enter the camera lens for imaging. In other words, the collimated light spot formed on the image side of the relay lens group can completely enter the camera lens for imaging, so that each image point of the collimated light spot can be used as an imaging pixel point for imaging, thereby facilitating the camera lens to perform ultra-high-definition lossless imaging of the collimated light spot formed on the image side of the relay lens group on a high-resolution image sensor, such as forming an ultra-high-definition image of 7680x4320 pixels on an 8K (7680x4320 pixels) image sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0072] Figure 1 It is a schematic diagram of the optical structure of an embodiment of an optical endoscope of the present invention;

[0073] Figure 2a-2b Schematic diagram of a measuring device for measuring the illuminance of the image side of an optical endoscope in one embodiment of the present invention;

[0074] Figure 3a It is a schematic diagram of the appearance structure of an existing optical endoscope;

[0075] Figure 3b This is a schematic diagram of the appearance and structure of an embodiment of an ultra-high definition optical endoscope of the present invention;

[0076] Figure 3c A partial cross-sectional view of an embodiment of an ultra-high definition optical endoscope of the present invention;

[0077] Figure 3d A partial cross-sectional view of an embodiment of an ultra-high definition optical endoscope of the present invention;

[0078] Figure 3eA partial cross-sectional view of another embodiment of the ultra-high definition optical endoscope of the present invention;

[0079] Figure 4 for Figure 1 A schematic diagram of the optical structure of the objective lens assembly in the illustrated embodiment;

[0080] Figure 5 for Figure 1 A schematic diagram of the optical structure of the relay mirror assembly in the illustrated embodiment;

[0081] Figure 6 for Figure 1 Schematic diagram of the optical structure of the camera lens assembly in the illustrated embodiment. DETAILED DESCRIPTION

[0082] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0083] It should be clear that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0084] Figure 1 The optical structure diagram of the optical endoscope in this embodiment is shown. Figure 1 The optical endoscope of this embodiment includes: a tube body (not shown in the figure) and an objective lens group 10 and a relay lens group 20 arranged in the tube body. The relay lens group 20 is arranged on the image side of the objective lens group 10, and a collimating magnifying lens group 301 is provided on the image side of the relay lens group 20.

[0085] The objective lens group 10 is used to form an image of the observed object 40.

[0086] The relay lens group 20 is used to relay the image formed by the objective lens group 10. In the process of transmitting the image formed by the objective lens group 10, the direction of the image formed by the objective lens group 10 can be inverted multiple times. For example, if the image of the object to be observed formed by the objective lens group 10 is an inverted image, after multiple inversions by the relay lens group 20, an upright image of the object to be observed can be obtained on the image side of the relay lens group 20.

[0087] The collimating magnifying lens group 301 is used to magnify the light spot on the image side of the relay lens group 20 into a parallel collimated light spot, so that the light emission angle of the relay lens group is consistent with the light incident angle of the camera lens, and the size of the parallel collimated light spot formed after magnification is consistent with the size of the entrance pupil of the camera lens; the light emission side of the relay lens group is the image side of the relay lens group.

[0088] In this embodiment, the meaning of the parallel collimated light spot is that all the light rays forming the light spot are parallel to the optical axis.

[0089] In the embodiment of the present invention, the collimating magnifying lens group 301 amplifies the light spot transmitted by the relay lens group, so as to facilitate the camera lens to form an image on a high-resolution image sensor, such as forming an ultra-high-definition image of 7680x4320 pixels on an 8K (7680x4320 pixels) image sensor.

[0090] Furthermore, the collimating magnifying lens group 301 amplifies the light spot transmitted by the relay lens group to form a parallel collimated light spot, so that the light emission angle of the relay lens group is consistent with the light incident angle of the camera lens, and the size of the parallel collimated light spot formed after amplification is consistent with the size of the entrance pupil of the camera lens. In this way, the light of the collimated light spot formed on the image side of the relay lens group can completely enter the camera lens for imaging. In other words, the collimated light spot formed on the image side of the relay lens group can completely enter the camera lens for imaging, so that each image point of the collimated light spot can be used as an imaging pixel point for imaging, thereby facilitating the camera lens to perform ultra-high-definition lossless imaging of the collimated light spot formed on the image side of the relay lens group on a high-resolution image sensor, such as forming an ultra-high-definition image of 7680x4320 pixels on an 8K (7680x4320 pixels) image sensor.

[0091] In some embodiments, the illumination on the image side of the collimating magnifying lens assembly and the illumination on the object side of the objective lens assembly satisfy the following relationship:

[0092] ;

[0093] is the image-side illumination, in units of (lux);

[0094] is the object-side illuminance, in units of ;

[0095] is the transmittance, and its value range is ;

[0096] F is the aperture number, and its value range is .

[0097] Figure 2a FIG. 1 is a schematic diagram of a measuring device for measuring the illuminance of the image side of an optical endoscope in one embodiment of the present invention. The working end of the optical endoscope can be inserted into a light source box (used to provide object side illuminance), and an illuminometer is connected to the image side of the optical endoscope. Figure 2b As shown in the figure, the image-side illumination of the optical endoscope can be displayed by an illuminance meter.

[0098] Since there is a positive correlation between the image-side illumination of an optical endoscope and its resolution, the image-side illumination of the optical endoscope can be determined according to the object-side illumination of the optical endoscope and the above formula, and further, the resolution of different optical endoscope images can be determined according to the size of the image-side illumination of different optical endoscope images. This makes it convenient to accurately match the resolution of the image sensor of the camera device, and can make full use of existing hardware resources while achieving ultra-high-definition imaging.

[0099] In some embodiments, The value range is ; In some examples, = ,

[0100] In other examples, = In some other examples, = .

[0101] In some embodiments, the aperture number F=4; in other embodiments, the aperture number F=3.8; in yet other embodiments, the aperture number F=3.6; in yet other embodiments, the aperture number F=3.5.

[0102] In some embodiments, the optical endoscope has a working outer diameter of 10 mm (i.e., the outer diameter of the tube body is 10 mm), the outer diameter of the objective lens group (light-clearing aperture) is greater than or equal to 5.0 mm, and the outer diameter of the relay lens group (light-clearing aperture) is greater than or equal to 6.8 mm; in this way, a larger light-clearing aperture can be achieved with a working outer diameter of 10 mm, so as to obtain a larger light intensity, providing a hardware foundation for ultra-high-definition imaging.

[0103] In some examples, the aperture of the objective lens group is 6-6.8mm, and the aperture of the relay lens group is 7-7.8mm. If the aperture of the objective lens group and the relay lens group is too small, the amount of light will be reduced and the imaging quality will be affected. If the aperture is too large, the outer diameter of the tube will increase, limiting the application scenarios of the endoscope.

[0104] In one example, the tube body adopts a three-cavity structure, specifically, the tube body includes an inner tube, a middle tube and an outer tube; the objective lens group and the relay lens group are arranged in the inner tube, and the outer diameter of the relay lens group is 7 mm; the middle tube is sleeved on the outside of the outer tube; the outer tube is sleeved on the outside of the middle tube, and an optical fiber is arranged in the cavity between the inner wall of the outer tube and the outer wall of the middle tube. In this embodiment, the middle tube is sleeved between the inner tube and the outer tube to facilitate the layout of the optical fiber.

[0105] The embodiments of the present invention are not limited thereto, and the tube body may also adopt a two-cavity structure, wherein the tube body comprises an inner tube and an outer tube; the objective lens group and the relay lens group are arranged in the inner tube, and the outer diameter of the relay lens group is 7 mm; the outer tube is sleeved on the outside of the inner tube, and an optical fiber is arranged in the cavity between the inner wall of the outer tube and the outer wall of the inner tube.

[0106] In other embodiments, the ultra-high-definition optical endoscope has a working outer diameter of 4 mm (i.e., the outer diameter of the tube body is 4 mm). The outer diameter of the objective lens group is greater than or equal to 2.2 mm, the outer diameter of the relay lens group is greater than or equal to 3.0 mm, the outer diameter of the collimating magnifying lens group 301 is greater than or equal to 4.8 mm and less than or equal to 31 mm, or the outer diameter of the collimating magnifying lens group is greater than 31 mm. In this way, a larger aperture can be achieved with a working outer diameter of 4 mm, so as to obtain a larger light intensity, providing a hardware foundation for ultra-high-definition imaging.

[0107] It should be understood that the outer diameter of the objective lens group, the outer diameter of the relay lens group, and the outer diameter of the collimating magnifying lens group described in the embodiments of the present invention refer to the outer diameters of the lenses of each lens group.

[0108] Due to the increase in the light aperture of the objective lens group 10 and the relay lens group 20, adverse factors of aberration may be brought about. For this reason, in some embodiments, the relay lens group includes an odd-numbered array of rod lenses, and the odd-numbered array of rod lenses is at least five groups of rod lenses, so as to reduce or eliminate aberrations by setting up the at least five groups of rod lenses.

[0109] In the embodiment of the present invention, the inherent structure of the eyepiece in the traditional optical endoscope is abandoned, and a collimating magnifying glass group 301 (the outer diameter of the collimating magnifying glass group can be flexibly set) that can be easily matched with the imaging device is used instead.

[0110] In some embodiments, the outer diameter of the collimating magnifying lens assembly 301 is greater than or equal to 7.8 mm and less than or equal to 31 mm, so as to obtain a larger collimated light spot.

[0111] In some embodiments, the outer diameter of the collimating magnifying lens assembly is greater than 31 mm.

[0112] In some embodiments, the outer diameter of the collimating magnifier group 301 can be larger than the size specified by the industry standard, so that two camera devices (such as two camera lenses) can be arranged in parallel on the image side of the collimating magnifier group to achieve 3D imaging, and the two camera devices can rotate around the optical axis of the collimating magnifier group.

[0113] It should be understood that when the outer diameter of the collimating magnifying lens assembly is larger than the size specified by the industry standard, when realizing 2D imaging, a camera device (such as a camera lens) can also be set on the image side of the collimating magnifying lens assembly to realize 2D imaging. In other words, the outer diameter of the collimating magnifying lens assembly of this embodiment is compatible with 3D imaging and 2D imaging.

[0114] Figure 3a This is a schematic diagram of the outer diameter structure of an existing optical endoscope. Figure 3a The outer diameter of the eyepiece M (specifically the outer diameter of the lens constituting the eyepiece) is the outer diameter specified by the industry standard, such as 4-6 mm.

[0115] Figure 3b FIG. 1 is a schematic diagram of the outer diameter structure of an embodiment of an ultra-high definition optical endoscope of the present invention. Figure 3b The outer diameter D of the collimating magnifying lens assembly 301 in the embodiment of the present invention is 31 mm.

[0116] Figure 3c A partial cross-sectional view of an embodiment of an ultra-high definition optical endoscope of the present invention.

[0117] Figure 3d This is a partial cross-sectional view of an embodiment of an ultra-high-definition optical endoscope of the present invention, which can realize 3D imaging. Since the outer diameter of the collimating magnifying lens group 301 of this embodiment (specifically, the outer diameter of the lens constituting the collimating magnifying lens group) is larger than the outer diameter of the eyepiece of a conventional endoscope (specifically, the outer diameter of the lens constituting the eyepiece), two camera lenses can be arranged in parallel on the image side of the collimating magnifying lens group 301. Specifically, see Figure 3d In this embodiment, the camera lens 302 is disposed on the handle B; the camera lens 302 includes two camera lenses S1 and S2 disposed in parallel, and the handle B is also provided with two image sensors C1 and C2 corresponding to S1 and S2 respectively.

[0118] Figure 3e FIG. 1 is a partial cross-sectional view of another embodiment of the ultra-high-definition optical endoscope of the present invention, which is capable of achieving 2D imaging. Figure 3e In this embodiment, the camera lens 302 is disposed on the handle B; the camera lens 302 includes a camera lens S1, and an image sensor C1 corresponding to S1 is also disposed in the handle B.

[0119] according to Figure 3b-Figure 3e It can be seen that the collimating magnifying lens group 301 of this embodiment can be matched with a camera lens 302 including two camera lenses to achieve 3D imaging, and can also be matched with a camera lens 302 including only one camera lens to achieve 2D imaging, thereby achieving compatible 2D imaging and 3D imaging.

[0120] In the prior art, the traditional optical endoscope is designed for human eye observation, and its structure includes an objective lens, a relay lens group and an eyepiece. In addition, according to the provisions of the industry standard, the imaging clarity of the traditional optical endoscope is expressed by angular resolution, which is the limit resolution of the minimum discernible equidistant fringe width at a given optical working distance at the entrance pupil center of the optical mirror, and the unit is expressed in cycles / degrees.

[0121] The field of camera technology is different from that of optical endoscopes. In the field of camera technology, imaging is achieved through electronic technology (image sensor), and it is no longer necessary to directly observe the image of the object being observed through the human eye. The resolution of image sensors is constantly improving with the advancement of technology.

[0122] Due to the limitations of the industry standards of traditional optical endoscopes and the habitual practices of industry personnel (optical endoscopes are only produced according to the requirements of the optical endoscope industry itself), as well as the continuous advancement of camera technology, the resolution of traditional optical endoscopes cannot be accurately matched with the resolution of imaging devices, and the respective resolution capabilities of optical endoscopes and imaging devices cannot be fully and utilized.

[0123] In order to accurately match the resolution of the optical endoscope with the resolution of the imaging device, and give full play to and utilize the respective resolution capabilities of the optical endoscope and the imaging device, the embodiment of the present invention provides the object-side detail resolution of the optical endoscope. The meaning of the object-side detail resolution of the optical endoscope is: when the optical endoscope is used to observe the observed object, the minimum distance between two adjacent object points on the observed object that can be distinguished on the image formed by the optical endoscope, the unit is um (micrometer).

[0124] In some embodiments, the object-side detail resolution of the optical endoscope is 1.0um-2.0um. For example, the object-side detail resolution of the optical endoscope is 1.0um, 1.38um, 1.45um, 1.85um, and 2.0um.

[0125] Specifically, the object-side detail resolution of the optical endoscope in this embodiment is 1.0um-2.0um. In other words, when the optical endoscope of the embodiment of the present invention is used to observe the observed object (such as the tissue surface in the human body), the minimum distance between two adjacent object points on the observed object that can be distinguished in the image formed by the optical endoscope can reach 1.0um-2.0um, which is convenient for meeting the requirements of ultra-high-definition imaging of the observed object and can obtain 8K (7680x4320 pixels) ultra-high-definition images.

[0126] In the embodiment of the present invention, the imaging clarity of the optical endoscope is represented by the object-side detail resolution of the optical endoscope, and the unit is um, which is consistent with the unit of the pixel size of the image sensor.

[0127] On the one hand, when manufacturing the optical endoscope in the embodiment of the present invention, the object-side detail resolution (in um) of the optical endoscope to be manufactured can be determined based on the pixel size (in um) of the target image sensor, and then the outer diameter and optical path system of the optical endoscope can be designed to achieve the object-side detail resolution that reaches the pixel size of the target image sensor.

[0128] On the other hand, when the optical endoscope is manufactured, its object-side detail resolution is determined, and a target image sensor that matches its object-side detail resolution can be selected accordingly, so that the resolution of the optical endoscope and the resolution of the image sensor are accurately matched, thereby facilitating ultra-high-definition imaging. In other words, the optical endoscope of the embodiment of the present invention is manufactured for the purpose of matching with the best image sensor (such as COMS).

[0129] In the prior art, even if someone assembles a traditional optical endoscope and a camera device for use together, it is impossible to determine the best image sensor for use with the combination based on the angular resolution of the optical endoscope specified by industry standards, thereby affecting the display resolution of the entire system (the system consisting of the optical endoscope and the camera device).

[0130] According to the solution of the embodiment of the present invention, based on the object detail resolution of the optical endoscope, the image sensor used in combination can be accurately selected to achieve a precise match between the optical endoscope and the image sensor in ultra-high-definition imaging. While achieving ultra-high-definition imaging, existing hardware resources can be fully utilized.

[0131] In addition to using the object-side detail resolution to determine the imaging clarity of the optical endoscope, the imaging clarity of the optical endoscope can also be further determined by using the image-side optical resolution of the optical endoscope to calibrate the object-side detail resolution to more accurately determine the imaging clarity of the optical endoscope.

[0132] In this embodiment, the following quantitative relationship may exist between the image-side optical resolution and the object-side detail resolution:

[0133] ;

[0134] in, is the image-side optical resolution, in units of lp / mm (line pairs / mm);

[0135] is the object detail resolution, in um (micrometer);

[0136] is a constant whose value is 1000.

[0137] The image-side optical resolution of the optical endoscope is the product of the object-side optical resolution of the optical endoscope and the magnification of the optical endoscope. Both the object-side optical resolution and the magnification of the optical endoscope can be measured by existing optical measuring instruments.

[0138] In some embodiments, the image-side optical resolution of the optical endoscope is greater than or equal to 250 lp / mm-500 lp / mm, such as 250 lp / mm, 270 lp / mm, 345 lp / mm, or 500 lp / mm.

[0139] In some embodiments, the objective lens group 10 adopts a double-Gaussian symmetric system to compensate for the high-order aberrations (spherical aberration, coma, position chromatic aberration) of the system, with an aperture stop placed in the middle and the curvatures of the lenses on both sides bent toward the stop, which can further compensate for astigmatism and field area.

[0140] See also Figure 4 In some embodiments, the objective lens group 10 includes an objective lens 101, a compensation lens 102, a first cemented lens 103, a second cemented lens 104 and a third cemented lens 105; the objective lens 101, the compensation lens 102, the first cemented lens 103, the second cemented lens 104 and the third cemented lens 105 are arranged in sequence along the direction from the object side to the image side of the objective lens group 10.

[0141] When the working outer diameter of the optical endoscope is 10 mm, the combined focal length range of the objective lens group 10 is , ; is the focal length of the second cemented mirror 104, is the focal length of the third cemented lens 105.

[0142] When the working outer diameter of the optical endoscope is 4 mm, the combined focal length range of the objective lens group 10 is , ; is the focal length of the second cemented mirror 104, is the focal length of the third cemented lens 105.

[0143] In some embodiments, the object side of the objective lens 101 is flat, the image side is concave, and the average dispersion , curvature .

[0144] The object side of the compensation lens 102 is flat, the image side is convex, and the average dispersion , curvature .

[0145] The first bonding 103 is formed by bonding two positive and negative optical power bonding lenses, and is composed of a first lens 1031 and a second lens 1032; the dispersion coefficient satisfies vd3-vd4>10.

[0146] The first lens 1031 has a convex surface on the object side and a convex surface on the image side, and the ratio of the focal length to the effective aperture on the object side is preferably , average dispersion , the curvature of the object side The curvature of the image side ratio .

[0147] The object side surface of the second lens is concave, the image side surface is convex, and the ratio of the focal length to the effective aperture of the object side surface is , average dispersion , the curvature of the object side The curvature of the image side ratio .

[0148] The second cemented lens 104 is formed by gluing two positive and negative optical power cemented lenses, and is composed of a third lens 1041 and a fourth lens 1042, and the dispersion coefficient satisfies vd6-vd5>20.

[0149] The object side of the third lens 1041 is convex, the image side is concave, and the ratio of the focal length to the effective aperture of the object side is preferably , average dispersion ; Curvature of the side surface The curvature of the image side ratio ; The object side of the fourth lens is convex, the image side is concave, and the ratio of the focal length to the effective aperture of the object side is , average dispersion ; Curvature of the side surface The curvature of the image side ratio .

[0150] The third cemented lens 105 is formed by cementing two positive and negative power cemented lenses, and is composed of a fifth lens 1051 and a sixth lens 1052. The dispersion coefficient satisfies vd7-vd8>12.

[0151] The fifth lens 1051 has a convex object surface and a concave image surface. The ratio of the focal length to the effective aperture on the object surface is preferably , average dispersion ; Curvature of the side surface The curvature of the image side ratio .

[0152] The object side surface of the sixth lens is convex, the image side surface is convex, and the ratio of the focal length to the effective aperture of the object side surface is , average dispersion ; Curvature of the side surface The curvature of the image side ratio .

[0153] In some embodiments, the ratio of the overall focal length of the relay lens assembly 20 to the effective aperture of the object side of the relay lens assembly 20 is .

[0154] In some embodiments, the relay mirror assembly 20 includes an odd number of relay rod mirrors 201. Figure 5 Each group of rod mirrors 201 includes two three-cemented lens groups 2011; each three-cemented lens group 2011 includes a first relay lens 20111, a second relay lens 20112 and a third relay lens 20113; wherein, the first relay lens 20111 is glued to the second relay lens 20112, the second relay lens 20112 is glued to the third relay lens 20113, the first relay lens 20111 and the third relay lens 20113 are symmetrical with respect to the second relay lens 20112, and the optical parameters of the first relay lens 20111 and the third relay lens 20113 are consistent.

[0155] In some embodiments, the relay lens assembly further includes an aperture 2012 , and the convex surfaces of the first relay lens and the third relay lens are bent toward the aperture 2012 .

[0156] In some embodiments, when the working outer diameter of the optical endoscope is 10 mm, the overall combination range of the relay lens assembly is ,and ;in, is the focal length of the first relay lens, is the focal length of the second relay lens.

[0157] In other embodiments, when the working outer diameter of the optical endoscope is 4 mm, the overall combination range of the relay lens assembly is ,and ;in, is the focal length of the first relay lens, is the focal length of the second relay lens.

[0158] In some embodiments, in the relay lens assembly 20, the aperture 2012 and the cemented lens assembly form a double Gauss, and the magnification is symmetrical system.

[0159] In some embodiments, the incident numerical aperture NA and the exit numerical aperture ISNA of the relay lens assembly (also referred to as the rod lens assembly) 20 are equal, and the incident numerical aperture NA and the exit numerical aperture ISNA range from .

[0160] According to the formula: Relay lens resolution = The larger the NA, the smaller the resolution value, indicating a higher resolution. The convex surfaces of the first relay lens 20111 and the third relay lens 20113 are bent toward the aperture, which can reduce the increase in edge aberration caused by the increase in the NA of the rod lens group.

[0161] The overall combined focal length range of the relay lens group 20 is ,and It can meet the requirement of 7-7.8mm outer diameter of relay lens group and achieve 8K resolution. is the overall combined focal length of the relay lens group 20, is the focal length of the first relay lens 20111, is the focal length of the second relay lens 20112.

[0162] See also Figure 6 In some embodiments, the collimating magnifying lens set 301 includes a first collimating magnifying glued lens 3011 and a second collimating magnifying glued lens 3012 .

[0163] The first collimating and magnifying cemented lens 3011 is formed by gluing two positive and negative optical power cemented lenses, and is composed of a seventh lens 3012 and an eighth lens 3013; the dispersion coefficient satisfies vd12-vd13>25.

[0164] The seventh lens 3012 has a concave object surface and a convex image surface. The ratio of the focal length to the effective aperture of the object surface is preferably , average dispersion , the curvature of the object side The curvature of the image side ratio .

[0165] The object side of the eighth lens 3013 is concave, the image side is convex, and the ratio of the focal length to the effective aperture of the object side is preferably , average dispersion , the curvature of the object side The curvature of the image side ratio .

[0166] The second collimating magnifying cemented lens 3012 is formed by cementing two positive and negative optical power cemented lenses, and is composed of a ninth lens 3021 and a tenth lens 3022, and the dispersion coefficient satisfies vd14-vd15>12;

[0167] The ninth lens 3021 has a convex surface on the object side and a convex surface on the image side, and the ratio of the focal length to the effective aperture on the object side is preferably , average dispersion , the curvature of the object side The curvature of the image side ratio .

[0168] The object side of the tenth lens 3022 is concave, the image side is concave, and the ratio of the focal length to the effective aperture of the object side is preferably , average dispersion , the curvature of the object side The curvature of the image side ratio .

[0169] In some embodiments, the overall combined focal length range of the optical endoscope is ,and .

[0170] In some embodiments, the optical endoscope is an optical endoscope that facilitates the formation of 8K ultra-high-definition images of 7680x4320 pixels, referred to as an 8K ultra-high-definition optical endoscope.

[0171] See also Figure 1 The embodiment of the present invention further provides an optical endoscope imaging system, comprising:

[0172] Optical endoscope;

[0173] A camera lens 302, which is arranged on the image side of the optical endoscope and is used to form a real image of the outgoing light of the optical endoscope at an imaging plane;

[0174] The image sensor 50 is arranged on the image side of the optical endoscope and is used to convert the light formed by the optical endoscope at the imaging plane into an electrical signal.

[0175] The optical endoscope is any one of the optical endoscopes described in the above embodiments; the light emission angle of the collimating magnifying lens group 301 is consistent with the light incident angle of the camera lens 302 .

[0176] The technical effects of the optical endoscope imaging system of the embodiment of the present invention are basically the same as the technical effects of the aforementioned optical endoscope, and will not be described in detail here.

[0177] In some embodiments, the object-side detail resolution of the optical endoscope is 0.8-1.5 times the pixel size of the image sensor.

[0178] In the optical endoscope imaging system of this embodiment, the object-side detail resolution of the optical endoscope is 0.8-1.5 times the pixel size of the image sensor used therewith. In this way, the object-side detail resolution of the optical endoscope is combined (or bound) with the pixel size of the image sensor used therewith, and the two are matched with each other and coordinated, so as to facilitate the realization of stable and reliable ultra-high-definition imaging.

[0179] In some embodiments, the object-side detail resolution of the optical endoscope is 1.0 times the pixel size of the image sensor, so that the optical ultra-high-definition imaging performance of the optical endoscope and the image acquisition performance of the image sensor are perfectly matched, so that the performance of both can be fully utilized.

[0180] In the embodiment of the present invention, the beneficial effect of the object-side detail resolution of the optical endoscope is the same as the beneficial effect described in the aforementioned optical endoscope embodiment, and will not be described in detail here.

[0181] In some embodiments, the pixel size of the image sensor is 1.0um, 1.45um, 1.85um, or 2.0um.

[0182] The camera lens 302 may include a focus wheel to move one or more lenses in the camera lens 302 forward and backward along the optical axis. The camera lens 302 may also be called a snap-on lens, a conversion interface, or an adapter.

[0183] See also Figure 6 The camera lens 302 and the collimating magnifying lens group 301 can be collectively referred to as a camera assembly 30.

[0184] The camera lens 302 and the collimating magnifying lens group 301 are not detachable, and the two can be arranged in the same tube cavity to form an integrated design, which is convenient for the integrated installation and arrangement of the camera lens 302 and the collimating magnifying lens group 301, so that the exit pupil position of the collimating magnifying lens group 301 and the entrance pupil position of the camera lens 302 are relatively fixed, which is conducive to maintaining the consistency and stability of ultra-high-definition imaging.

[0185] The camera lens 302 and the collimating magnifying lens assembly 301 may also be detachably connected.

[0186] In one embodiment, the camera lens 302 and the collimating magnifying lens assembly 301 can be detachably connected via a standard connection structure.

[0187] In another embodiment, the camera lens 302 and the collimating magnifying lens assembly 301 are detachably connected via a proprietary connection structure.

[0188] In some embodiments, the connection structure of the detachable connection includes a first connection member and a second connection member, the first connection member is arranged on one side of the detachable connection, and the second connection member is arranged on the other side of the detachable connection.

[0189] When the camera lens 302 and the collimating magnifying lens group 301 are detachably connected, the first connecting member is arranged on the collimating magnifying lens group 301 (specifically, it can be arranged on the outer tube or shell where the collimating magnifying lens group 301 is located), and the second connecting member is arranged on the camera lens 302 (specifically, it can be arranged on the outer tube or shell where the camera lens 302 is located).

[0190] The first connecting member and the second connecting member are non-standard (ie, private) detachable connecting members.

[0191] In some examples, the connection size between the first connector and the second connector is a non-standard connection size, for example, the connection size between the first connector and the second connector is larger than the standard connection size, or the connection size between the first connector and the second connector is smaller than the standard connection size.

[0192] In other examples, the connection structure between the first connector and the second connector is a non-standard connection structure, such as the connection shape between the first connector and the second connector is a non-standard shape, for example, a plug of a specific shape may be provided on the first connector, and the second connector may be provided with a slot matching the plug of the specific shape.

[0193] The first connecting member and the second connecting member are not limited to non-standard detachable connecting members, and may also be standard detachable connecting members.

[0194] In some embodiments, the objective lens group 10, the relay lens group 20, the collimating magnifying lens group 301 and the camera lens 302 are arranged together in the same lumen to form an integrated design.

[0195] As mentioned above, the traditional optical endoscope is designed for human eye observation, and its structure includes an objective lens, a relay lens, and an eyepiece. Even if someone assembles a traditional optical endoscope with a camera device for use, the eyepiece of the traditional optical endoscope and the focusing lens of the camera device are located in different cavities, which is not an integrated structural arrangement, and is not conducive to maintaining the consistency and stability of ultra-high-definition imaging.

[0196] In the embodiment of the present invention, the objective lens group 10, the relay lens group 20, the collimating magnifying lens group 301 and the camera lens 302 are arranged together in the same tube cavity, so that the positions of the objective lens group 10, the relay lens group 20, the collimating magnifying lens group 301 and the camera lens 302 are relatively fixed with respect to each other, especially the exit pupil position of the collimating magnifying lens group 301 and the entrance pupil position of the camera lens 302 are relatively fixed, which is conducive to maintaining the consistency of optical path transmission, thereby maintaining the consistency and stability of ultra-high-definition imaging.

[0197] In some embodiments, the spot diameter of the light incident port of the camera lens 302 (also referred to as the entrance pupil diameter) is 1 to 6 times the spot diameter of the light exit port of the collimating magnifying lens group 301 (also referred to as the exit pupil diameter), and the spot diameter of the light exit port of the collimating magnifying lens group 301 is 1.5-8 mm, preferably 2-3 mm.

[0198] In some embodiments, the spot diameter of the light incident port of the camera lens 302 is 1 to 6 times the spot diameter of the light exit port of the collimating magnifying lens group 301, so that the light spot passing through the collimating magnifying lens group 301 can fully enter the camera lens 302, which is beneficial to increase the light flux entering the camera lens, thereby facilitating ultra-high-definition imaging.

[0199] See also Figure 3d In some embodiments, the camera lens 302 includes two camera lenses arranged in parallel for 3D imaging.

[0200] See also Figure 3e In some other embodiments, the camera lens 302 includes a single camera lens for 2D imaging.

[0201] In one embodiment, according to the formula, the Airy disk ,in , D is the entrance pupil diameter, f is the system focal length, aperture F=f / D, the Airy disk must be within 2.8um to match the 8K chip with a pixel size of 1.45um, then the overall aperture of the system is 4, so the aperture ≤4, the endoscope can have 8K resolution, that is, the MTF curve reaches 250lp / mm-500lp / mm.

[0202] In each embodiment of the optical endoscope or optical endoscope imaging system of the present invention, the endoscope and the camera lens are designed as an integral whole, so the design concept is completely different from that of a traditional visual endoscope.

[0203] The overall F number of the system is 4, and the structure can adopt a 3-cavity structure. Unlike traditional endoscopes, a single optical endoscope is observed by the human eye through an eyepiece, which has no practical significance in the field of modern medical imaging and needs to be connected to a monitor for observation. Therefore, in order to obtain high resolution, the 8K endoscope abandons the traditional eyepiece, and the collimating magnifying glass group is directly designed as an integral whole with the camera lens, so that the emission angle of the collimating magnifying glass group is better matched with the incident angle of the camera system, so as to compensate for the processing and adjustment errors of the front-end lens group and achieve the best 8K ultra-high-definition imaging effect.

[0204] In some embodiments, the optical endoscope imaging system may further include: an image processing device, which is connected to the camera device and is used to process the image on the image sensor; a display device, which is used to display the image processed by the image processing device on a display screen; wherein, when the image resolution of the optical endoscope and the resolution of the image sensor are both 250lp / mm, the display mode of the display device is a 3840x2160 pixel mode; or, when the image resolution of the optical endoscope and the resolution of the image sensor are both 345 lp / mm, the display mode of the display device is a 7680x4320 pixel mode.

[0205] In the above-mentioned embodiments of the present invention, the object side may also be referred to as the object side, and the image side may also be referred to as the image side.

[0206] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0207] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An optical endoscope, characterized in that: include: A tube body and an objective lens group and a relay lens group arranged in the tube body, wherein the relay lens group is arranged on the image side of the objective lens group, and a collimating magnifying lens group is arranged on the image side of the relay lens group; Wherein, the objective lens group is used to form an image of the object being observed; The relay lens group is used to relay the image formed by the objective lens group; The collimating magnifying lens group is used to magnify the light spot on the image side of the relay lens group into a parallel collimated light spot, so that the light emission angle of the relay lens group is consistent with the light incident angle of the camera lens, and the size of the parallel collimated light spot formed after magnification is consistent with the size of the entrance pupil of the camera lens; the light emission side of the relay lens group is the image side of the relay lens group.

2. The optical endoscope according to claim 1, characterized in that The illumination on the image side of the collimating magnifying lens assembly and the illumination on the object side of the objective lens assembly satisfy the following relationship: ； is the image-side illumination, in units of ; is the object-side illuminance, in units of ; is the transmittance, and its value range is ; F is the aperture number, and its value range is .

3. The optical endoscope according to claim 1, characterized in that: The outer diameter of the tube body is 10 mm, the outer diameter of the objective lens group is greater than or equal to 5.0 mm, the outer diameter of the relay lens group is greater than or equal to 6.8 mm, the outer diameter of the collimating magnifying lens group is greater than or equal to 7.8 mm and less than or equal to 31 mm, or the outer diameter of the collimating magnifying lens group is greater than 31 mm; or The outer diameter of the tube body is 4 mm, the outer diameter of the objective lens group is greater than or equal to 2.2 mm, the outer diameter of the relay lens group is greater than or equal to 3.0 mm, the outer diameter of the collimating magnifying lens group 301 is greater than or equal to 4.8 mm and less than or equal to 31 mm, or the outer diameter of the collimating magnifying lens group is greater than 31 mm.

4. The optical endoscope according to claim 3, characterized in that: The relay mirror group includes an odd number of rod mirrors, and the odd number of rod mirrors is at least five groups of rod mirrors.

5. The optical endoscope according to claim 1, characterized in that: The object-side detail resolution of the optical endoscope is 1.0um-2.0um; and / or The image-side optical resolution of the optical endoscope is greater than or equal to 250 lp / mm-500 lp / mm.

6. The optical endoscope according to claim 1, characterized in that: The objective lens group comprises an objective lens, a compensation lens, a first cemented lens, a second cemented lens and a third cemented lens; The objective lens, the compensation lens, the first cemented lens, the second cemented lens and the third cemented lens are arranged in sequence along the direction from the object side to the image side of the objective lens group; When the working outer diameter of the optical endoscope is 10 mm, the combined focal length range of the objective lens group is , ; When the working outer diameter of the optical endoscope is 4 mm, the combined focal length range of the objective lens group is , ; in, is the focal length of the second cemented lens; is the focal length of the third cemented lens.

7. The optical endoscope according to claim 1, characterized in that: The relay mirror group includes an odd number of relay rod mirrors, and each group of rod mirrors includes two triple-cemented mirror groups; Each triplet lens group includes a first relay lens, a second relay lens and a third relay lens; wherein the first relay lens is glued to the second relay lens, the second relay lens is glued to the third relay lens, the first relay lens and the third relay lens are symmetrical relative to the second relay lens, and the optical parameters of the first relay lens and the third relay lens are consistent.

8. An optical endoscope imaging system, characterized in that: include: Optical endoscope; A camera lens, which is arranged on the image side of the optical endoscope and is used to form a real image of the outgoing light of the optical endoscope at an imaging plane; An image sensor, the image sensor being arranged on the image side of the optical endoscope and used for converting light imaged by the optical endoscope at an imaging plane into an electrical signal; Wherein, the optical endoscope is the optical endoscope as described in any one of claims 1 to 7; the light exit angle of the collimating magnifying lens group is consistent with the light incident angle of the camera lens.

9. The optical endoscope imaging system according to claim 8, characterized in that: The object-side detail resolution of the optical endoscope is 0.8-1.5 times the pixel size of the image sensor.

10. The optical endoscope imaging system according to claim 8, characterized in that: The camera lens and the collimating magnifying lens assembly are not removable; or The camera lens and the collimating magnifying lens group are detachably connected via a standard connection structure, or detachably connected via a non-standard connection structure.

11. The optical endoscope imaging system according to claim 8, characterized in that: The objective lens group, the relay lens group, the collimating magnifying lens group and the camera lens are arranged together in the same tube cavity to form an integrated design.

12. The optical endoscope imaging system according to claim 8, characterized in that: The spot diameter of the light incident port of the camera lens is 1 to 6 times the spot diameter of the light exit port of the collimating magnifier group, and the spot diameter of the light exit port of the collimating magnifier group is 1.5 to 8 mm.

13. The optical endoscope imaging system according to claim 8, characterized in that: The camera lens includes two camera lenses arranged in parallel for 3D imaging; or the camera lens has only one camera lens for 2D imaging.

Images