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

Abstract

Embodiments of the present invention relate to the technical field of medical devices. Disclosed are an 8K ultra-high-definition optical endoscope and an imaging system, which are invented to provide an optical endoscope having high resolution. The optical endoscope comprises a tubular body, as well as an objective lens group and a relay lens group that are arranged within the tubular body. The relay lens group is disposed on an image side of the objective lens group, and a collimating magnifying lens group is arranged on an image side of the relay lens group. The objective lens group is used for imaging an observed subject, the relay lens group relays and transmits an image formed by the objective lens group, and the collimating magnifying lens group magnifies a light spot at the image side of the relay lens group into a parallel collimated light spot, so that the light exit angle of the relay lens group matches the light incident angle of an imaging lens, and the size of the magnified parallel collimated light spot matches the size of the entrance pupil of the imaging lens. The light exit side of the relay lens group is the image side of the relay lens group. The embodiments of the present invention are suitable for scenarios in which medical examinations and surgeries are performed by means of an endoscope.

Description

8K Ultra-High Definition Optical Endoscope and Imaging System

[0001] This application claims priority to Chinese Patent Application No. 202411731692.7, filed on November 28, 2024, entitled “8K Ultra-High Definition Optical Endoscope and Imaging System”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This invention relates to the field of medical diagnostic instrument technology, and in particular to an 8K ultra-high-definition optical endoscope and imaging system. Background Technology

[0003] Medical diagnostic instruments are devices or instruments that identify various medical conditions in patients, assisting doctors in making accurate and timely diagnoses so that doctors can effectively treat and manage diseases.

[0004] Optical endoscopes are commonly used medical devices that can be inserted into the human body through natural orifices or small surgical incisions to help doctors diagnose and treat diseases. Examples include gastroscopes and colonoscopes.

[0005] An optical endoscope system combines an optical endoscope with a camera device to form a system that allows for viewing images of the observed object on a display device. Currently, existing optical endoscopes are insufficient to meet the requirements of ultra-high-definition imaging in clinical settings. Summary of the Invention

[0006] In view of this, embodiments of the present invention provide an optical endoscope and imaging system with higher resolution.

[0007] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0008] In a first aspect, embodiments of the present invention provide an optical endoscope, comprising: a tube body and an objective lens group and a relay lens group disposed within 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.

[0009] The objective lens group is used to image the observed object;

[0010] The relay lens group is used to relay the image formed by the objective lens group;

[0011] The collimating magnifying lens group is used to magnify the light spot on the image side of the relay lens group into a parallel collimating light spot, so that the light exit angle of the relay lens group is consistent with the light incident angle of the camera lens, and the size of the parallel collimating light spot formed after magnification is consistent with the size of the entrance pupil of the camera lens, or the size of the parallel collimating light spot formed after magnification is smaller than the size of the entrance pupil of the camera lens; the light exit side of the relay lens group is the image side of the relay lens group.

[0012] According to one implementation of the present invention, the illuminance of the image side of the collimating magnifying lens group and the illuminance of the object side of the objective lens group satisfy the following relationship:

[0013] E′ is the image-side illuminance in lx; E is the object-side illuminance in lx; τ is the transmittance, ranging from 75% to 100%; F is the aperture number, ranging from 3 to 4.

[0014] According to one implementation 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, and 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

[0015] The outer diameter of the tube 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.

[0016] According to one embodiment of the present invention, the objective lens group has an aperture of 6-6.8 mm, and the relay lens group has an aperture of 7-7.8 mm.

[0017] According to one embodiment of the present invention, the tube body includes an inner tube, a middle tube, and an outer tube; the objective lens group and the relay lens group are disposed 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 disposed in the cavity between the inner wall of the outer tube and the outer wall of the middle tube.

[0018] According to one implementation of the present invention, the relay lens group includes an odd number of rod lenses, and the odd number of rod lenses is at least five groups of rod lenses.

[0019] According to one implementation of the present invention, the object-side detail resolution of the optical endoscope is 1.0µm-2.0µm.

[0020] According to one implementation of the present invention, the object-side detail resolution of the optical endoscope is 1.0 μm, 1.38 μm, 1.45 μm, 1.85 μm, or 2.0 μm.

[0021] According to one implementation of the present invention, the image-side optical resolution of the optical endoscope is 250 lp / mm to 500 lp / mm.

[0022] According to one embodiment of the present invention, the objective lens group adopts a quasi-double Gaussian symmetry system, with an aperture stop placed in the middle and the curvature of the lenses on both sides bent toward the aperture stop.

[0023] According to one embodiment of the present invention, the objective lens group includes an objective lens, a compensating lens, a first cemented lens, a second cemented lens, and a third cemented lens;

[0024] The objective lens, compensating lens, first cemented lens, second cemented lens and third cemented lens are arranged sequentially from the object side to the image side of the objective lens group;

[0025] Wherein, when the working outer diameter of the optical endoscope is 10mm, the combined focal length range of the objective lens group is 3.2 < f 物镜组 <4.5,

[0026] When the working outer diameter of the optical endoscope is 4 mm, the combined focal length range of the objective lens group is 2.4 < f. 物镜组 <3.6,

[0027] Where f2 is the focal length of the second cemented lens; and f3 is the focal length of the third cemented lens.

[0028] According to one implementation of the present invention, the ratio of the overall focal length of the relay lens group to the effective aperture of the object aspect of the relay lens group is 2.8 < fd. 通 <3.5.

[0029] According to one implementation of the present invention, the relay lens group includes an odd number of relay rod lenses, each rod lens group including two cemented lens groups; each cemented lens group includes a first relay lens, a second relay lens and a third relay lens; wherein, the first relay lens is cemented with the second relay lens, the second relay lens is cemented with the third relay lens, the first relay lens and the third relay lens are symmetrical with respect to the second relay lens, and the optical parameters of the first relay lens and the third relay lens are consistent.

[0030] According to one implementation of the present invention, the relay lens group 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.

[0031] According to one implementation 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 22 < f. 转像镜组 <25, and 1.5 < f9f 10 <2.5;

[0032] When the working outer diameter of the optical endoscope is 4mm, the overall assembly range of the relay endoscope group is:

[0033] 8 < f 转像镜组 <13, and 1.2 < f9f 10 <1.9;

[0034] Where f9 is the focal length of the first relay lens, f 10 This is the focal length of the second relay lens.

[0035] According to one embodiment of the present invention, the aperture stop and the cemented lens group form a double Gaussian configuration with a magnification β = -1. × A symmetric system.

[0036] According to one implementation of the present invention, the incident numerical aperture NA and the outgoing numerical aperture ISNA of the relay lens group are equal, and the range of incident numerical aperture NA and outgoing numerical aperture ISNA is 0.01 < NA (ISNA) < 0.2.

[0037] According to one implementation of the present invention, the object-side surface of the objective lens is planar, the image-side surface is concave, and the average dispersion is 0.01 < n. F -n c <0.02, curvature 0.2<ρ<0.6;

[0038] The compensating lens has a planar object side and a convex image side, with an average dispersion of 0.01 < n. F -n c <0.015, curvature 0.01<ρ<0.1;

[0039] The first cemented lens consists of a first lens and a second lens, with a dispersion coefficient satisfying 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 1.8 < fd. 通 <2.1, mean dispersion 0.01<n F -n c <0.014, the ratio of the object side curvature ρ1 to the image side curvature ρ2 The object-side surface of the second lens is concave, and the image-side surface is convex. The ratio of the focal length to the effective aperture of the object-side surface is 1.1 < fd. 通 <1.5, mean dispersion 0.015 < n F-n c <0.018, the ratio of the object side curvature ρ1 to the image side curvature ρ2

[0040] The second cemented lens consists of a third lens and a fourth lens, with a dispersion coefficient satisfying vd6 - vd5 > 20; the object-side surface of the third lens is convex, and the image-side surface is concave, with a focal length to the effective aperture of the object-side surface ratio of 1.3 < fd. 通 <1.9, mean dispersion 0.015 <n F -n c <0.02; the ratio of object side curvature ρ1 to image side curvature ρ2 The fourth lens has a convex object-side surface and a concave image-side surface. The ratio of the focal length to the effective aperture of the object-side surface is 2.2 < fd. 通 <5.6, mean dispersion 0.01<n F -n c <0.013; the ratio of object side curvature ρ1 to image side curvature ρ2

[0041] The third cemented lens is composed of a fifth lens and a sixth lens, with a dispersion coefficient satisfying vd7 - vd8 > 12; the object-side surface of the fifth lens is convex, and the image-side surface is concave, with the ratio of focal length to the effective aperture of the object-side surface being 4 < fd. 通 <7.6, mean dispersion 0.01<n F -n c <0.013; the ratio of object side curvature ρ1 to image side curvature ρ2 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 1.8 < fd. 通 <3.2, mean dispersion 0.014 <n F -n c <0.021; the ratio of the curvature ρ1 of the object side to the curvature ρ2 of the image side

[0042] According to one implementation of the present invention, the collimating magnifying lens group includes: a first collimating magnifying cemented lens and a second collimating magnifying cemented lens;

[0043] The first collimating magnifying cemented lens consists of a seventh lens and an eighth lens, with a dispersion coefficient satisfying vd12 - vd13 > 25; the object side of the seventh lens is concave, and the image side is convex, with the ratio of focal length to the effective aperture of the object side being 4 < fd. 通 <5.6, mean dispersion 0.01<n F -n c <0.013, the ratio of the object side curvature ρ1 to the image side curvature ρ2 The object-side surface of the eighth lens is concave, and the image-side surface is convex. The ratio of the focal length to the effective aperture of the object-side surface is 5.6 < fd. 通 <6.2, mean dispersion 0.015 <n F -n c <0.02, the ratio of the object side curvature ρ1 to the image side curvature ρ2

[0044] The second collimating and magnifying cemented lens consists of a ninth lens and a tenth lens, with a dispersion coefficient satisfying vd14 - vd15 > 12; the object-side and image-side of the ninth lens are convex, and the ratio of focal length to the effective aperture of the object-side lens is preferably 4 < fd. 通 <4.6, mean dispersion 0.011<n F -n c <0.015, the ratio of the curvature ρ1 of the object side to the curvature ρ2 of the image side. The object-side surface of the tenth lens is concave, and the image-side surface is also concave. The ratio of the focal length to the effective aperture of the object-side surface is preferably 1.05 < fd. 通 <1.78, mean dispersion 0.016 < n F -n c <0.019, the ratio of the object side curvature ρ1 to the image side curvature ρ2

[0045] Secondly, embodiments of the present invention provide an optical endoscope imaging system, comprising: an optical endoscope; a camera lens disposed on the image side of the optical endoscope for forming a real image of the outgoing light rays from the optical endoscope on an imaging plane; an image sensor disposed on the image side of the optical endoscope for converting the light imaged by the optical endoscope on the imaging plane into an electrical signal; wherein the optical endoscope is the optical endoscope described in any of the aforementioned implementations; and the light exit angle of the collimating magnifying lens group is consistent with the light incident angle of the camera lens.

[0046] According to one implementation 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.

[0047] According to one implementation of the present invention, the camera lens and the collimating magnifying lens group are not detachable; or, the camera lens and the collimating magnifying lens group are detachably connected by a standard connection structure or by a non-standard connection structure.

[0048] According to one embodiment of the present invention, the objective lens group, the relay lens group, the collimating magnifying lens group, and the camera lens are all housed in the same cavity to form an integrated design.

[0049] According to one embodiment of the present invention, the light spot diameter of the light entrance of the camera lens is 1 to 6 times the light spot diameter of the light exit of the collimating magnifying lens group, and the light spot diameter of the light exit of the collimating magnifying lens group is 1.5-8 mm.

[0050] According to one implementation of the present invention, the camera lens includes two camera lenses arranged in parallel for 3D imaging; or,

[0051] The camera lens has only one lens and is used for 2D imaging.

[0052] According to one implementation of the present invention, the camera lens includes a third camera lens, a fourth camera cemented lens, and a fifth camera lens;

[0053] The object-side surface of the third imaging lens is convex, and the image-side surface is concave. The ratio of the focal length to the effective aperture of the object-side surface is 2.5 < fd. 通 <2.7, mean dispersion 0.01 <n F -n c <0.015, the ratio of the curvature ρ1 of the object side to the curvature ρ2 of the image side.

[0054] The fourth camera lens consists of an eleventh lens and a twelfth lens, with a dispersion coefficient satisfying vd17 - vd18 > 22. The object-side and image-side surfaces of the eleventh lens are concave, and the ratio of the focal length to the effective aperture of the object-side surface is 4.3 < fd. 通 <4.85, mean dispersion 0.01 <n F -n c <0.013, the ratio of the object side curvature ρ1 to the image side curvature ρ2 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 1.42 < fd. 通 <1.66, mean dispersion 0.017 < n F -n c <0.021, the ratio of the object side curvature ρ1 to the image side curvature ρ2

[0055] The fifth imaging lens has a concave object-side surface and a convex image-side surface, with the ratio of focal length to the effective aperture of the object-side surface being 1.3 < fd. 通 <1.65, mean dispersion 0.018 <n F -n c <0.022; the ratio of object side curvature ρ1 to image side curvature ρ2

[0056] According to one embodiment of the present invention, the optical endoscope is an optical endoscope that facilitates the formation of 8K ultra-high-definition images of 7680x4320 pixels.

[0057] The optical endoscope and imaging system of this invention uses a collimating magnifying lens group to magnify the light spot transmitted by the relay lens group, which facilitates imaging by the camera lens on a high-resolution image sensor, such as forming an ultra-high-definition image of 7680x4320 pixels on an 8K (7680x4320 pixels) image sensor.

[0058] 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 exit angle of the relay lens group is consistent with the light incident angle of the camera lens, and the size of the magnified parallel collimated light spot is consistent with the size of the entrance pupil of the camera lens. This allows the light from the collimated light spot formed on the image side of the relay lens group to 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 image pixel. This facilitates 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 a 7680x4320 pixel ultra-high-definition image on an 8K (7680x4320 pixels) image sensor. Attached Figure Description

[0059] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0060] Figure 1 is a schematic diagram of the optical structure of an embodiment of the optical endoscope of the present invention;

[0061] Figures 2a-2b are schematic diagrams of a measuring device used to measure the illuminance of the image side of an optical endoscope in one embodiment of the present invention.

[0062] Figure 3a is a schematic diagram of the external structure of an existing optical endoscope;

[0063] Figure 3b is a schematic diagram of the external structure of an embodiment of the ultra-high-definition optical endoscope of the present invention;

[0064] Figure 3c is a partial cross-sectional view of an embodiment of the ultra-high-definition optical endoscope of the present invention;

[0065] Figure 3d is a partial cross-sectional view of an embodiment of the ultra-high-definition optical endoscope of the present invention;

[0066] Figure 3e is a partial cross-sectional view of another embodiment of the ultra-high-definition optical endoscope of the present invention;

[0067] Figure 4 is a schematic diagram of the optical structure of the objective lens assembly in the embodiment shown in Figure 1;

[0068] Figure 5 is a schematic diagram of the optical structure of the relay lens group in the embodiment shown in Figure 1.

[0069] Figure 6 is a schematic diagram of the optical structure of the camera lens assembly in the embodiment shown in Figure 1. Detailed Implementation

[0070] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0071] Figure 1 shows a schematic diagram of the optical structure of the optical endoscope in this embodiment. Referring to Figure 1, the optical endoscope in this embodiment includes: a tube (not shown in the figure) and an objective lens group 10 and a relay lens group 20 disposed in the tube. The relay lens group 20 is disposed on the image side of the objective lens group 10, and a collimating magnifying lens group 301 is disposed on the image side of the relay lens group 20.

[0072] Objective lens group 10 is used to image the observed object 40.

[0073] The relay lens group 20 is used to relay the image formed by the objective lens group 10. During the transmission of the image formed by the objective lens group 10, the orientation of the image formed by the objective lens group 10 can be inverted multiple times. For example, if the image of the observed object formed by the objective lens group 10 is inverted, after multiple inversions by the relay lens group 20, an upright image of the observed object can be obtained in the image position of the relay lens group 20.

[0074] The collimating magnifying lens group 301 is used to magnify the image-side light spot of the relay lens group 20 into a parallel collimated light spot, so that the light exit angle of the relay lens group is consistent with the light incident angle of the camera lens, and the size of the magnified parallel collimated light spot is consistent with the size of the entrance pupil of the camera lens, or the size of the magnified parallel collimated light spot is smaller than the size of the entrance pupil of the camera lens; the light exiting side of the relay lens group is the image side of the relay lens group.

[0075] In other words, the collimating magnifying lens group 301 is used to magnify the light spot on the image side of the relay lens group 20, forming a parallel collimated light spot on the image side of the collimating magnifying lens group 301. The light exit angle of the parallel collimated light spot is consistent with the light incident angle of the camera lens, and the size of the parallel collimated light spot is consistent with the size of the entrance pupil of the camera lens, or the size of the parallel collimated light spot is smaller than the size of the entrance pupil of the camera lens; the light exit side of the relay lens group is the image side of the relay lens group, and the light exit side of the collimating magnifying lens group 301 is the image side of the collimating magnifying lens group 301.

[0076] In this embodiment, "parallel collimated spot" means that all light rays forming the spot are parallel to the optical axis. The entrance pupil of a camera lens refers to the aperture of the camera lens; the size of the entrance pupil is the same as the size of the aperture.

[0077] In this embodiment of the invention, the collimating magnifying lens group 301 magnifies the light spot transmitted by the relay lens group, which facilitates the imaging of the camera lens on a high-resolution image sensor, such as forming an ultra-high-definition image of 7680x4320 pixels on an 8K (7680x4320 pixels) image sensor.

[0078] Furthermore, the collimating magnifying lens group 301 magnifies the light spot transmitted by the relay lens group to form a parallel collimated light spot, so that the light exit angle of the relay lens group is consistent with the light incident angle of the camera lens, and the size of the magnified parallel collimated light spot is consistent with the size of the entrance pupil of the camera lens, or the size of the magnified parallel collimated light spot is smaller than the size of the entrance pupil of the camera lens. This allows the light from the collimated light spot formed on the image side of the relay lens group to 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. This facilitates 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 a 7680x4320 pixel ultra-high-definition image on an 8K (7680x4320 pixels) image sensor.

[0079] In some embodiments, the illuminance on the image side of the collimating magnifying lens group and the illuminance on the object side of the objective lens group satisfy the following relationship:

[0080] E′ is the image-side illuminance, in lx (lux); E is the object-side illuminance, in lx; τ is the transmittance, ranging from 75% ≤ τ ≤ 100%; F is the aperture number, ranging from 3 ≤ F ≤ 4.

[0081] Figure 2a is a schematic diagram of a measuring device for measuring the image-side illuminance of an optical endoscope according to an embodiment of the present invention. The working end of the optical endoscope can be inserted into a light source box (for providing object-side illuminance), and an illuminance meter is connected to the image side of the optical endoscope. When the working end of the optical endoscope is inserted into the light source box (as shown in Figure 2b), the image-side illuminance of the optical endoscope can be displayed by the illuminance meter.

[0082] Since there is a positive correlation between the image-side illuminance and the resolution of an optical endoscope, the image-side illuminance of the optical endoscope can be determined based on the object-side illuminance and the above formula. Furthermore, the resolution of different optical endoscope images can be determined based on the magnitude of the image-side illuminance. This allows for convenient and accurate matching with the image sensor of the camera device in terms of resolution, achieving ultra-high-definition imaging while making full use of existing hardware resources.

[0083] In some embodiments, the value of τ ranges from 85% to 98%; in some examples, τ = 85%, in others, τ = 90%, and in still others, τ = 95%.

[0084] In some embodiments, the aperture number F = 4; in other embodiments, the aperture number F = 3.8; in still other embodiments, the aperture number F = 3.6; and in yet other embodiments, the aperture number F = 3.5.

[0085] 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 (light-transmitting aperture) of the objective lens group is greater than or equal to 5.0 mm, and the outer diameter (light-transmitting aperture) of the relay lens group is greater than or equal to 6.8 mm; this allows for a large light-transmitting aperture with a working outer diameter of 10 mm, so as to obtain a large light intensity and provide a hardware foundation for ultra-high-definition imaging.

[0086] In some cases, the objective lens group has an aperture of 6-6.8 mm, and the relay lens group has an aperture of 7-7.8 mm. If the apertures of the objective lens group and the relay lens group are too small, it will inevitably reduce the light transmission and affect image quality; if the apertures are too large, it will lead to an increase in the outer diameter of the tube, limiting the application scenarios of the endoscope. In some cases, the objective lens group aperture can be 6 mm, 6.2 mm, 6.4 mm, 6.6 mm, or 6.8 mm; in other cases, the relay lens group aperture can be 7 mm, 7.2 mm, 7.4 mm, 7.6 mm, or 7.8 mm.

[0087] 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 disposed 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 disposed 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 deployment of the optical fiber.

[0088] The embodiments of the present invention are not limited to this. The tube body may also adopt a two-cavity structure, the tube body includes an inner tube and an outer tube; the objective lens group and the relay lens group are disposed in the inner tube, and the outer diameter of the relay lens group is 7mm; the outer tube is sleeved on the outside of the inner tube, and an optical fiber is disposed in the cavity between the inner wall of the outer tube and the outer wall of the inner tube.

[0089] 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). Specifically, 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, and 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. This allows for a large light-transmitting aperture within a 4 mm working outer diameter, enabling the acquisition of greater light intensity and providing a hardware foundation for ultra-high-definition imaging.

[0090] 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 mentioned in the various embodiments of the present invention refer to the outer diameter of the lens of each lens group.

[0091] The increased aperture of the objective lens group 10 and the relay lens group 20 may introduce aberrations. Therefore, in some embodiments, the relay lens group includes an odd number of bar lenses, at least five in total, to mitigate or eliminate aberrations through the arrangement of these at least five bar lenses.

[0092] In this embodiment of the invention, the inherent structure of the eyepiece in a traditional optical endoscope is abandoned, and a collimating magnifying lens group 301 that can be easily matched with an imaging device is used instead (the outer diameter of the collimating magnifying lens group can be flexibly set).

[0093] In some embodiments, the outer diameter of the collimating magnifying lens group 301 is greater than or equal to 7.8 mm and less than or equal to 31 mm in order to obtain a larger collimated spot.

[0094] In some embodiments, the outer diameter of the collimating magnifying lens group is greater than 31 mm.

[0095] In some embodiments, the outer diameter of the collimating magnifying lens group 301 may be larger than the size specified by industry standards, so that two imaging devices (such as two camera lenses) can be arranged in parallel on the image side of the collimating magnifying lens group to achieve 3D imaging, and the two imaging devices can rotate around the optical axis of the collimating magnifying lens group.

[0096] It should be understood that when the outer diameter of the collimating magnifying lens group is relatively large compared to the size specified in the industry standard, a camera device (such as a camera lens) can also be set on the image side of the collimating magnifying lens group to achieve 2D imaging. In other words, the outer diameter of the collimating magnifying lens group in this embodiment is compatible with both 3D and 2D imaging.

[0097] Figure 3a is a schematic diagram of the outer diameter structure of an existing optical endoscope. Referring to Figure 3a, the outer diameter of the eyepiece M (specifically, the outer diameter of the lens that makes up the eyepiece) is the outer diameter dimension specified by industry standards, such as 4-6 mm.

[0098] Figure 3b is a schematic diagram of the outer diameter structure of an embodiment of the ultra-high-definition optical endoscope of the present invention. Referring to Figure 3b, the outer diameter D of the collimating magnifying lens group 301 in this embodiment of the present invention is 31 mm.

[0099] Figure 3c is a partial cross-sectional view of an embodiment of the ultra-high-definition optical endoscope of the present invention.

[0100] Figure 3d is a partial cross-sectional view of an embodiment of the 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 in this embodiment (specifically, the outer diameter of the lenses 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 lenses constituting the eyepiece), two camera lenses can be arranged in parallel on the image side of the collimating magnifying lens group 301. Specifically, referring to Figure 3d, in this embodiment, the camera lens 302 is mounted on the handle B; the camera lens 302 includes two camera lenses S1 and S2 arranged in parallel, and the handle B also contains two image sensors C1 and C2 corresponding to S1 and S2, respectively.

[0101] Figure 3e is a partial cross-sectional view of another embodiment of the ultra-high-definition optical endoscope of the present invention, which is capable of 2D imaging. Referring to Figure 3e, in this embodiment, the camera lens 302 is mounted on the handle B; the camera lens 302 includes a camera lens S1, and an image sensor C1 corresponding to S1 is also provided in the handle B.

[0102] As shown in Figures 3b-3e, the collimating magnifying lens group 301 of this embodiment can be matched with a camera lens 302 that includes two camera lenses to achieve 3D imaging, or it can be matched with a camera lens 302 that includes only one camera lens to achieve 2D imaging, thereby achieving compatibility with both 2D and 3D imaging.

[0103] In the prior art, traditional optical endoscopes are designed specifically for human eye observation, and their structure includes an objective lens, a relay lens group, and an eyepiece. Furthermore, according to industry standards, the imaging sharpness of traditional optical endoscopes is expressed in angular resolution, which is the round number of the limit resolution of the minimum resolvable equidistant fringe width at a given optical working distance with respect to the entrance pupil center of the optical endoscope, expressed in circles per degree.

[0104] The field of camera technology and optical endoscopy belong to different technical fields. In the field of camera technology, imaging is achieved through electronic technology (image sensors), eliminating the need for direct human observation of the observed object. The resolution of image sensors continues to improve with technological advancements.

[0105] Due to the limitations of industry standards for traditional optical endoscopes and the habitual practices of industry personnel (producing optical endoscopes only according to the requirements of the optical endoscope industry itself), as well as the continuous advancement of imaging technology, the resolution of traditional optical endoscopes cannot be accurately matched with the resolution of imaging devices, and the resolution capabilities of both optical endoscopes and imaging devices cannot be fully utilized.

[0106] To ensure precise matching between the resolution of the optical endoscope and the resolution of the imaging device, and to fully utilize the resolving capabilities of both, this invention provides the object-side detail resolution of the optical endoscope. The object-side detail resolution of the optical endoscope is defined as the minimum distance between two adjacent points on the observed object that can be distinguished on the image formed by the optical endoscope when observing the object, expressed in micrometers (µm).

[0107] 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, or 2.0um.

[0108] Specifically, the object-side detail resolution of the optical endoscope in this embodiment is 1.0um-2.0um. In other words, when observing an object (such as the surface of tissue in the human body) using the optical endoscope of this embodiment, the minimum distance between two adjacent points on the object that can be distinguished on the image formed by the optical endoscope can reach 1.0um-2.0um, which facilitates meeting the requirements of ultra-high-definition imaging of the object and can obtain an 8K (7680x4320 pixels) ultra-high-definition image.

[0109] In this embodiment of the invention, the object-side detail resolution of the optical endoscope is used to represent the imaging sharpness of the optical endoscope, with the unit being μm, which is consistent with the unit of the pixel size of the image sensor.

[0110] On the one hand, when manufacturing the optical endoscope in the embodiments of the present invention, the object-side detail resolution (in μm) of the optical endoscope to be manufactured can be determined first based on the pixel size (in μm) of the target image sensor. Then, by designing the outer diameter and optical path system of the optical endoscope, its object-side detail resolution can reach the pixel size of the target image sensor.

[0111] On the other hand, once the optical endoscope is manufactured, its object-space detail resolution is determined. Based on this, a target image sensor that matches its object-space detail resolution can be selected, ensuring a precise match between the resolution of the optical endoscope and the resolution of the image sensor, thus facilitating ultra-high-definition imaging. In other words, the optical endoscope of this invention is manufactured to achieve the goal of matching an optimal image sensor (such as a CMOS).

[0112] In the existing technology, even if someone assembles and uses a traditional optical endoscope with a camera device, it is impossible to determine the optimal image sensor to use based on the angular resolution of the optical endoscope as specified by industry standards, thereby affecting the display resolution of the entire system (the system composed of the optical endoscope and the camera device).

[0113] According to the embodiments of the present invention, the image sensor can be accurately selected and matched based on the object-side detail resolution of the optical endoscope, so as to achieve a precise match between the optical endoscope and the image sensor in ultra-high-definition imaging. While realizing ultra-high-definition imaging, it can make full use of existing hardware resources.

[0114] In addition to using the object-side detail resolution to determine the imaging sharpness of an optical endoscope, the image-side optical resolution of the optical endoscope can be used to further determine the imaging sharpness of the optical endoscope in order to verify the object-side detail resolution and more accurately determine the imaging sharpness of the optical endoscope.

[0115] In this embodiment, the following quantitative relationship may exist between image-side optical resolution and object-side detail resolution:

[0116] Θ1=η / (2×Θ2);

[0117] Where Θ1 is the image-side optical resolution, in lp / mm (line pairs / millimeters); Θ2 is the object-side detail resolution, in μm (micrometers); and η is a constant with a value of 1000.

[0118] The image-side optical resolution of an optical endoscope is the sum of its object-side optical resolution and its magnification. Both the object-side optical resolution and the magnification of an optical endoscope can be measured using existing optical measuring instruments.

[0119] In some embodiments, the image-side optical resolution of the optical endoscope is 250 lp / mm to 500 lp / mm. For example, it can be 250 lp / mm, 270 lp / mm, 345 lp / mm, or 500 lp / mm, etc.

[0120] In some embodiments, the objective lens group 10 employs a double-Gaussian symmetry system to compensate for advanced aberrations (spherical aberration, coma, positional chromatic aberration) of the system. An aperture stop is placed in the middle, and the curvature of the lenses on both sides bends toward the aperture stop, which can further compensate for astigmatism and field area.

[0121] Referring to Figure 4, in some embodiments, the objective lens group 10 includes an objective lens 101, a compensating lens 102, a first cemented lens 103, a second cemented lens 104, and a third cemented lens 105; the objective lens 101, the compensating lens 102, the first cemented lens 103, the second cemented lens 104, and the third cemented lens 105 are arranged sequentially along the direction from the object side to the image side of the objective lens group 10.

[0122] When the working outer diameter of the optical endoscope is 10mm, the combined focal length range of the objective lens group 10 is 3.2 < f. 物镜组 <4.5, f2 is the focal length of the second cemented lens 104, and f3 is the focal length of the third cemented lens 105.

[0123] When the working outer diameter of the optical endoscope is 4mm, the combined focal length range of objective lens group 10 is 2.4 < f. 物镜组 <3.6, f2 is the focal length of the second cemented lens 104, and f3 is the focal length of the third cemented lens 105.

[0124] In some embodiments, the object plane of the objective lens 101 is planar, the image plane is concave, and the average dispersion is 0.01 < n. F -n c <0.02, curvature 0.2<ρ<0.6.

[0125] Compensating lens 102 has a planar object plane and a convex image plane, with an average dispersion of 0.01 < n. F -n c <0.015, curvature 0.01<ρ<0.1.

[0126] The first cemented lens 103 is formed by cementing two positive and negative optical power cemented lenses, consisting of a first lens 1031 and a second lens 1032; the dispersion coefficient satisfies vd3-vd4>10.

[0127] The object plane of the first lens 1031 is convex, the image plane is convex, and the ratio of focal length to the effective aperture of the object plane is preferably 1.8 < fd. 通 <2.1, mean dispersion 0.01<n F -n c <0.014, the ratio of the object side curvature ρ1 to the image side curvature ρ2

[0128] The object-side surface of the second lens is concave, and the image-side surface is convex. The ratio of the focal length to the effective aperture of the object-side surface is 1.1 < fd. 通 <1.5, mean dispersion 0.015 < n F -n c <0.018, the ratio of the object side curvature ρ1 to the image side curvature ρ2

[0129] The second cemented lens 104 is made of two positive and negative optical power cemented lenses cemented together, and is composed of a third lens 1041 and a fourth lens 1042. The dispersion coefficient satisfies vd6-vd5>20.

[0130] The object plane of the third lens 1041 is convex, and the image plane is concave. The ratio of focal length to the effective aperture of the object plane is preferably 1.3 < fd. 通 <1.9, mean dispersion 0.015 <n F -n c <0.02; the ratio of object side curvature ρ1 to image side curvature ρ2 The fourth lens has a convex object-side surface and a concave image-side surface. The ratio of the focal length to the effective aperture of the object-side surface is 2.2 < fd. 通 <5.6, mean dispersion 0.01<n F -n c <0.013; the ratio of object side curvature ρ1 to image side curvature ρ2

[0131] The third cemented lens 105 is composed of two positive and negative optical power cemented lenses bonded together, consisting of the fifth lens 1051 and the sixth lens 1052. The dispersion coefficient satisfies vd7-vd8>12.

[0132] The object plane of the fifth lens 1051 is convex, and the image plane is concave. The ratio of the focal length to the effective aperture of the object plane is preferably 4 < fd. 通 <7.6, mean dispersion 0.01<n F -n c <0.013; the ratio of object side curvature ρ1 to image side curvature ρ2

[0133] 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 1.8 < fd. 通 <3.2, mean dispersion 0.014 <n F -n c <0.021; the ratio of the curvature ρ1 of the object side to the curvature ρ2 of the image side

[0134] In some embodiments, the ratio of the overall focal length of the relay lens group 20 to the effective aperture of the relay lens group 20 in the object aspect is 2.8 < fd. 通 <3.5.

[0135] In some embodiments, the relay lens group 20 includes an odd number of relay rod lenses 201. Referring to FIG5, each rod lens group 201 includes two cemented lens groups 2011; each 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 cemented with the second relay lens 20112, the second relay lens 20112 is cemented with 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.

[0136] In some embodiments, the relay lens group further includes an aperture stop 2012, with the convex surfaces of the first relay lens and the third relay lens bent toward the aperture stop 2012.

[0137] In some embodiments, when the working outer diameter of the optical endoscope is 10 mm, the overall combination range of the relay lens group is 22 < f. 转像镜组 <25, and 1.5 < f9f 10 <2.5; where f9 is the focal length of the first relay lens, f 10 This is the focal length of the second relay lens.

[0138] In other embodiments, when the working outer diameter of the optical endoscope is 4 mm, the overall combination range of the relay lens group is 8 < f. 转像镜组 <13, and 1.2 < f9f 10<1.9; where f9 is the focal length of the first relay lens, f 10 This is the focal length of the second relay lens.

[0139] In some embodiments, in the relay lens group 20, the aperture 2012 and the cemented lens group form a double Gaussian structure with a magnification β = -1. × A symmetric system.

[0140] In some embodiments, the incident numerical aperture NA of the relay lens group (also known as the rod lens group) 20 is equal to the outgoing numerical aperture ISNA, and the range of incident numerical aperture NA and outgoing numerical aperture ISNA is 0.01 < NA (ISNA) < 0.2.

[0141] According to the formula: Relay lens group resolution = 0.61λ / NA, the larger NA is, the smaller the resolution value, indicating higher resolution. The convex surfaces of the first relay lens 20111 and the third relay lens 20113 are bent towards the aperture stop, which can reduce the increase in marginal aberration caused by the increase in NA of the bar lens group.

[0142] The overall focal length range of the relay lens group 20 is 22 < f. z <25, and 1.5 < f 11 f 12 A diameter of <2.5mm can meet the requirements of a relay lens group with an outer diameter of 7-7.8mm, achieving 8K resolution. z The overall focal length of the relay lens group 20 is f. 11 f is the focal length of the first relay lens 20111. 12 This is the focal length of the second relay lens 20112.

[0143] Referring to Figure 6, in some embodiments, the collimating magnifying lens group 301 includes a first collimating magnifying cemented lens 3011 and a second collimating magnifying cemented lens 3012.

[0144] The first collimating and magnifying cemented lens 3011 is made of two positive and negative optical power cemented lenses cemented together, and is composed of the seventh lens 3012 and the eighth lens 3013; the dispersion coefficient satisfies vd12-vd13>25.

[0145] The object plane of the seventh lens 3012 is concave, and the image plane is convex. The ratio of focal length to the effective aperture of the object plane is preferably 4 < fd. 通 <5.6, mean dispersion 0.01<n F -n c <0.013, the ratio of the object side curvature ρ1 to the image side curvature ρ2

[0146] The object plane of the eighth lens 3013 is concave, and the image plane is convex. The ratio of focal length to the effective aperture of the object plane is preferably 5.6 < fd. 通<6.2, mean dispersion 0.015 <n F -n c <0.02, the ratio of the object side curvature ρ1 to the image side curvature ρ2

[0147] The second collimating and magnifying cemented lens 3012 is made of two positive and negative optical power cemented lenses, and is composed of the ninth lens 3021 and the tenth lens 3022. The dispersion coefficient satisfies vd14-vd15>12.

[0148] The object plane of the ninth lens 3021 is convex, and the image plane is also convex. The ratio of focal length to the effective aperture of the object plane is preferably 4 < fd. 通 <4.6, mean dispersion 0.011<n F -n c <0.015, the ratio of the curvature ρ1 of the object side to the curvature ρ2 of the image side.

[0149] The object plane of the tenth lens 3022 is concave, and the image plane is also concave. The ratio of focal length to the effective aperture of the object plane is preferably 1.05 < fd. 通 <1.78, mean dispersion 0.016 < n F -n c <0.019, the ratio of the object side curvature ρ1 to the image side curvature ρ2

[0150] In some embodiments, the overall focal length range of the optical endoscope assembly is 22 < f. 物镜组 <25, and 1.5 < f 透镜9 f 透镜10 <2.5.

[0151] 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.

[0152] Referring to Figure 1, this embodiment of the invention also provides an optical endoscope imaging system, including: an optical endoscope; a camera lens 302, the camera lens being disposed on the image side of the optical endoscope, for forming a real image of the outgoing light rays from the optical endoscope on the imaging plane; and an image sensor 50, the image sensor being disposed on the image side of the optical endoscope, for converting the light imaged by the optical endoscope on the imaging plane into an electrical signal.

[0153] Wherein, the optical endoscope is the optical endoscope described in any of the foregoing embodiments; the light exit angle of the collimating magnifying lens group 301 is consistent with the light incident angle of the camera lens 302.

[0154] The technical effects of the optical endoscope imaging system in this embodiment are basically the same as those of the aforementioned optical endoscope, and will not be repeated here.

[0155] 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, for example, 0.8 times, 0.9 times, 1 time, 1.2 times, 1.3 times, or 1.5 times.

[0156] In this embodiment of the optical endoscope imaging system, the object-side detail resolution of the optical endoscope is 0.8-1.5 times the pixel size of the image sensor used with it. 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 with it. The two are matched and coordinated, which facilitates the realization of stable and reliable ultra-high-definition imaging.

[0157] In some embodiments, the object-side detail resolution of the optical endoscope is 1.0 times the pixel size of the image sensor, thereby achieving an optimal match between the ultra-high-definition optical imaging performance of the optical endoscope and the image acquisition performance of the image sensor, so that the performance of both can be fully utilized.

[0158] In the embodiments of the present invention, the beneficial effect of the optical endoscope in terms of object-side detail resolution is the same as the beneficial effect described in the aforementioned optical endoscope embodiments, and will not be repeated here.

[0159] In some embodiments, the pixel size of the image sensor is 1.0 μm, 1.45 μm, 1.85 μm, or 2.0 μm.

[0160] The camera lens 302 may include a focusing wheel for moving one or more lenses in the camera lens 302 back and forth along the optical axis. The camera lens 302 may also be referred to as a snap-on lens, a conversion interface, or an adapter.

[0161] Referring to Figure 6, the camera lens 302 and the collimating magnifying lens group 301 together can be referred to as camera assembly 30.

[0162] The camera lens 302 and the collimating magnifying lens group 301 are not detachable. They can be housed in the same cavity to form an integrated design, which facilitates the integrated installation and arrangement of the camera lens 302 and the collimating magnifying lens group 301. This makes the exit pupil position of the collimating magnifying lens group 301 and the entrance pupil position of the camera lens 302 relatively fixed, which is beneficial to maintaining the consistency and stability of ultra-high-definition imaging.

[0163] The camera lens 302 and the collimating magnifying lens group 301 can also be detachably connected.

[0164] In one embodiment, the camera lens 302 and the collimating magnifying lens group 301 can be detachably connected via a standard connection structure.

[0165] In another embodiment, the camera lens 302 and the collimating magnifying lens group 301 are detachably connected via a proprietary connection structure.

[0166] In some embodiments, the detachable connection structure includes a first connector and a second connector, wherein the first connector is disposed on one side of the detachable connection and the second connector is disposed on the other side of the detachable connection.

[0167] When the camera lens 302 and the collimating magnifying lens group 301 are detachably connected, the first connecting member is provided on the collimating magnifying lens group 301 (specifically, it can be provided on the outer tube or housing where the collimating magnifying lens group 301 is located), and the second connecting member is provided on the camera lens 302 (specifically, it can be provided on the outer tube or housing where the camera lens 302 is located).

[0168] Among them, the first connector and the second connector are non-standard (i.e. proprietary) detachable connectors.

[0169] In some cases, the connection dimensions of the first connector and the second connector are non-standard connection dimensions. For example, the connection dimensions of the first connector and the second connector are larger than the standard connection dimensions, or the connection dimensions of the first connector and the second connector are smaller than the standard connection dimensions.

[0170] In other examples, the connection structure of the first connector and the second connector is a non-standard connection structure. For example, the connection shape of the first connector and the second connector is a non-standard shape. For instance, the first connector may have a plug of a specific shape, and the second connector may have a slot that matches the plug of the specific shape.

[0171] The connection between the first connector and the second connector is not limited to non-standard detachable connectors, but can also be a standard detachable connector.

[0172] 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 all housed in the same cavity to form an integrated design.

[0173] As mentioned earlier, traditional optical endoscopes are designed specifically for human eye observation, and their structure includes an objective lens, a relay lens, and an eyepiece. Even if someone assembles a traditional optical endoscope with a camera device, 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.

[0174] In this embodiment of the invention, the objective lens group 10, the relay lens group 20, the collimating magnifying lens group 301, and the camera lens 302 are all housed in the same 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. In particular, 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 helps to maintain the consistency of optical path transmission, thereby maintaining the consistency and stability of ultra-high-definition imaging.

[0175] In some embodiments, the light spot diameter (also known as the entrance pupil diameter) of the light entrance of the camera lens 302 is 1 to 6 times the light spot diameter (also known as the exit pupil diameter) of the collimating magnifying lens group 301, for example, 1.2 times, 1.5 times, 2 times, 2.5 times, 3 times, 3.5 times, 4 times, 4.5 times, 5 times, 5.5 times, or 6 times. The light spot diameter of the light exit of the collimating magnifying lens group 301 is 1.5-8 mm, preferably 2-3 mm.

[0176] In some embodiments, the light spot diameter at the light entrance of the camera lens 302 is 1 to 6 times the light spot diameter at the light exit of the collimating magnifying lens group 301, which facilitates the complete entry of the light spot through the collimating magnifying lens group 301 into the camera lens 302, thereby increasing the light throughput entering the camera lens and thus benefiting ultra-high-definition imaging.

[0177] Referring to Figure 3d, in some embodiments, the camera lens 302 includes two camera lenses arranged in parallel for 3D imaging.

[0178] Referring to Figure 3e, in some embodiments, the camera lens 302 includes a single camera lens for 2D imaging.

[0179] In one embodiment, according to the formula Airy disk = 1.22λDf, where λ is the wavelength, D is the entrance pupil diameter, f is the system focal length, and the aperture F = f / D, the Airy disk must be within 2.8µm to match an 8K chip with a pixel size of 1.45µm. Therefore, the overall system aperture is 4. So, only when the aperture is ≤4 can the endoscope achieve 8K resolution, that is, the MTF curve reaches 250lp / mm-500lp / mm.

[0180] In the various embodiments of the optical endoscope or optical endoscope imaging system of the present invention, the endoscope and camera lens are designed as a whole, so the design concept is completely different from that of traditional visual endoscopes.

[0181] The system has an overall F-number of 4 and can adopt a 3-cavity structure. Unlike traditional endoscopes, which rely on eyepieces for observation, the 8K endoscope, designed for high resolution, abandons traditional eyepieces and integrates the collimating magnifying lens group with the camera lens. This design allows for a better match between the exit angle of the collimating magnifying lens group and the incident angle of the camera system, compensating for manufacturing and assembly errors in the front-end lens group and achieving the best 8K ultra-high-definition imaging effect.

[0182] In some embodiments, the optical endoscope imaging system may further include: an image processing device connected to a camera device for processing the image on the image sensor; and a display device for displaying 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 250 lp / 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.

[0183] In the above embodiments of the present invention, the object side can also be referred to as the object side, and the image side can also be referred to as the image side.

[0184] The various embodiments in this specification are described in a related manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0185] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An optical endoscope, characterized in that, include: The tube body and the objective lens group and relay lens group disposed within 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. The objective lens group is used to image the observed object; 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 collimating light spot, so that the light exit angle of the relay lens group is consistent with the light incident angle of the camera lens, and the size of the parallel collimating light spot formed after magnification is consistent with the size of the entrance pupil of the camera lens, or the size of the parallel collimating light spot formed after magnification is smaller than the size of the entrance pupil of the camera lens; the light exit 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 illuminance on the image side of the collimating magnifying lens group and the illuminance on the object side of the objective lens group satisfy the following relationship: E′ is the image-side illuminance, in lx; E represents the object-side illuminance, measured in lx. τ is the transmittance, and its value ranges from 75% to 100%. F is the aperture number, and its value ranges from 3 to 4.

3. The optical endoscope according to claim 1, characterized in that, 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 The outer diameter of the tube 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 lens group includes an odd number of rod lenses, and the odd number of rod lenses is at least five groups of rod lenses.

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

6. The optical endoscope according to claim 1, characterized in that, The objective lens group includes an objective lens, a compensating lens, a first cemented lens, a second cemented lens, and a third cemented lens; The objective lens, compensating lens, first cemented lens, second cemented lens and third cemented lens are arranged sequentially from the object side to the image side of the objective lens group; Wherein, when the working outer diameter of the optical endoscope is 10mm, the combined focal length range of the objective lens group is 3.2 < f 物镜组 <4.5, When the working outer diameter of the optical endoscope is 4 mm, the combined focal length range of the objective lens group is 2.4 < f. 物镜组 <3.6, Where f2 is the focal length of the second cemented lens; and f3 is the focal length of the third cemented lens.

7. The optical endoscope according to claim 1, characterized in that, The relay lens group includes an odd number of relay rod lenses, and each rod lens group includes two triplet lens groups. Each triple-lens assembly includes a first relay lens, a second relay lens, and a third relay lens; wherein the first relay lens is cemented with the second relay lens, the second relay lens is cemented with the third relay lens, the first relay lens and the third relay lens are symmetrical with respect 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 is disposed on the image side of the optical endoscope and is used to form a real image of the outgoing light rays of the optical endoscope on the imaging plane. An image sensor, located on the image side of the optical endoscope, is used to convert the light imaged by the optical endoscope at the imaging plane into an electrical signal; Wherein, the optical endoscope is the optical endoscope as described in any one of claims 1-7; 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 detachable; or The camera lens and the collimating magnifying lens group can be detachably connected via a standard connection structure or 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 all housed in the same cavity to form an integrated design.

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

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

Images