Mirror sheath protection structure, mirror assembly and endoscope

Abstract

The present application discloses a mirror sheath protection structure, a mirror group assembly, and an endoscope. The mirror sheath protection structure includes: a first sleeve, including a first end and a second end arranged opposite to each other, a through-channel inside the first sleeve including a first mounting section extending to the first end for mounting a magnifying lens group and a second mounting section extending to the second end for mounting a portion of a rod-shaped lens group; a second sleeve, coaxially arranged with the first sleeve and fixedly connected to the second end of the first sleeve, the through-channel inside the second sleeve including a third mounting section for accommodating the portion of the rod-shaped lens group protruding outside the first sleeve. During installation of the present application, the rod-shaped lens group can be first embedded in the portion of the first sleeve for glue fixation, and then the rest of the rod-shaped lens group can be inserted into the second sleeve to achieve installation of the lens group. This helps to ensure the flatness of the small-sized crescent mirror at the head end of the rod-shaped lens group and facilitates glue fixation.

Description

Technical Field

[0001] The present application relates to the technical field of endoscopes, and in particular to a sheath protection structure, a lens assembly, and an endoscope. Background Art

[0002] Endoscopic microscope equipment generally has components such as a small objective lens, a light source, a magnifying glass, a rod mirror, and a photoelectric conversion module. Among them, the light source provides illumination, and the image is formed through the small objective lens after being reflected from the surface of the object. Since the image formed by the small objective lens is very close to the small objective lens, and the endoscope needs to be inserted into the human body to contact the tissue surface for imaging, the length of the sheath is several tens of centimeters long. This requires the use of a rod mirror combination to transmit the image of the small objective lens backward. At the same time, in order to increase the magnification of the image, optical magnification will first be performed inside the sheath, so the magnifying glass component is needed.

[0003] Because the rod-shaped lens assembly and the magnifying lens assembly have different magnifications and diameters, it's impossible to use a mirror sheath with the same inner diameter to mount the lenses of both the rod-shaped and magnifying lens assemblies. The prior art uses an adapter with openings of different sizes at both ends, with the magnifying lens assembly mounted on one end and the rod-shaped lens assembly mounted on the other. Due to the rod-shaped lens assembly's excessive length, ensuring the flatness of the crescent mirror at the end of the rod-shaped lens assembly during installation is difficult. Furthermore, to ensure high alignment of the rod-shaped lens, the inner diameter of the adapter and the outer diameter of the rod-shaped lens must be highly consistent. This makes it difficult to secure the rod-shaped lens within the adapter using glue after installation. Summary of the Invention

[0004] The purpose of the present application is to provide a mirror sheath protection structure, a mirror group assembly and an endoscope, so as to solve the technical problems in the prior art of using an adapter with different sizes of openings at both ends to install a magnifying glass group and a rod-shaped mirror group, making it difficult to ensure the flatness of the crescent mirror at the end of the rod-shaped mirror group during installation, and difficult to achieve the fixed gluing operation of the rod-shaped mirror in the adapter after the rod-shaped mirror is installed.

[0005] To achieve the above objectives, the present application provides a first aspect of a mirror sheath protection structure, comprising:

[0006] a first sleeve including a first end and a second end opposite to each other, wherein a through passage inside the first sleeve includes a first mounting section extending to the first end for mounting the magnifying lens assembly and a second mounting section extending to the second end for mounting a portion of the rod-shaped lens assembly;

[0007] The second sleeve is coaxially arranged with the first sleeve and fixedly connected to the second end of the first sleeve. The through channel inside the second sleeve includes a third mounting section for accommodating the portion of the rod-shaped lens assembly protruding outside the first sleeve.

[0008] In one or more embodiments, the through passage inside the second sleeve further includes a first docking cavity located on a side of the third mounting section close to the second end, and the first sleeve is embedded in the first docking cavity to connect and fix the first sleeve and the second sleeve;

[0009] The first docking cavity, the third mounting section, the first mounting section and the second mounting section are arranged on the same optical axis.

[0010] In one or more embodiments, the outer wall of the first sleeve near the second end is formed with a first annular surface, a second annular surface, and a third annular surface arranged in sequence along the direction from the second end to the first end, and the diameters of the first annular surface, the second annular surface, and the third annular surface increase in sequence;

[0011] The first docking cavity includes a first docking section that matches the size of the second annular surface, and a second docking section that matches the size of the first annular surface.

[0012] In one or more embodiments, the second annular surface is inwardly concave to form a first annular groove, and / or outwardly convex to form a first annular boss;

[0013] The inner wall of the first docking section is protruded away from the outer wall to form a second annular boss that cooperates and locks with the first annular groove, and / or is recessed toward the outer wall to form a second annular groove that cooperates and locks with the first annular boss.

[0014] In one or more embodiments, a first external thread is arranged on the second annular surface and / or the third annular surface, a first internal thread matching the first external thread is arranged on the inner wall of the first docking section and / or the second docking section, and the first sleeve and the second sleeve are threadedly connected by the first external thread and the first internal thread.

[0015] In one or more embodiments, an axial length of the portion of the rod-shaped lens assembly installed in the second installation section is one tenth to one third of the entire axial length of the rod-shaped lens assembly.

[0016] In one or more embodiments, the through channel inside the first sleeve also includes an extension section that connects the first mounting segment and the second mounting segment, the diameter of the extension section is smaller than the first mounting segment and the second mounting segment, and the diameter of the first mounting segment is larger than the diameter of the second mounting segment, so that a first limiting step is formed between the extension section and the first mounting segment, and a second limiting step is formed between the extension section and the second mounting segment.

[0017] In one or more embodiments, a gap greater than or equal to 0.01 mm is formed between the inner wall of the third mounting section and the rod-shaped lens assembly.

[0018] In one or more embodiments, the end surface of the first end and / or the end surface of the second end is a frustum with a cone angle pointing to the middle of the first sleeve.

[0019] In one or more embodiments, a third sleeve is further included, which is coaxially arranged with the first sleeve and fixedly connected to the first end of the first sleeve. The through channel inside the third sleeve includes a fourth mounting section located at the end away from the first sleeve. The fourth mounting section is used to install a dust-proof lens to form an enclosed space inside the third sleeve that is connected to the first mounting section.

[0020] In one or more embodiments, a fourth annular surface is formed on the outer wall of the first sleeve near the first end, and the fourth annular surface is inwardly concave to form a third annular groove, and / or outwardly convex to form a third annular boss;

[0021] The through channel inside the third sleeve also includes a second docking cavity located near one end of the first sleeve, and the fourth annular surface is embedded in the second docking cavity. The second docking cavity matches the size of the fourth annular surface, and the inner wall of the second docking cavity is protruded away from the outer wall to form a fourth annular boss that cooperates and engages with the third annular groove, and / or is recessed toward the outer wall to form a fourth annular groove that cooperates and engages with the third annular boss.

[0022] In one or more embodiments, a fourth annular surface is formed on the outer wall of the first sleeve near the first end, and a second external thread is arranged on the fourth annular surface. The through channel inside the third sleeve also includes a second docking cavity located near one end of the first sleeve, and the inner wall of the second docking cavity is arranged with a second internal thread matching the second external thread. The first sleeve and the third sleeve are threadedly connected by the second external thread and the second internal thread.

[0023] In one or more embodiments, the through channel inside the third sleeve also includes a transition section and a first light expansion section, the diameter of the transition section is not less than the diameter of the first mounting section, the first light expansion section connects the transition section and the fourth mounting section, and the diameter of the first light expansion section gradually increases in the direction away from the transition section.

[0024] In one or more embodiments, a fourth sleeve is further included, which is sleeved on the third sleeve, and the through channel inside the fourth sleeve includes a fifth mounting section located at one end away from the third sleeve, and the fifth mounting section is used to install the photoelectric conversion module.

[0025] In one or more embodiments, the through channel inside the fourth sleeve also includes a third docking cavity and a second light expansion section, the third docking cavity matches the outer wall size of the third sleeve, and the third sleeve is embedded in the third docking cavity, the second light expansion section penetrates and connects the third docking cavity and the fifth installation section, and the diameter of the second light expansion section gradually increases in the direction away from the third docking cavity.

[0026] In one or more embodiments, the first sleeve includes a circle of annular ridges arranged on the outer annular surface, the end of the fourth sleeve is connected to the annular ridges, and the fourth sleeve is an insulating sleeve.

[0027] In one or more embodiments, a pressure ring is further included. The pressure ring is mounted on the outer annular surface of the second sleeve at one end facing away from the first sleeve, and the pressure ring is used to connect the second sleeve and the mirror holder.

[0028] To achieve the above-mentioned objectives, the second aspect of the present application provides a lens assembly, comprising:

[0029] The mirror sheath protection structure described in any of the above embodiments;

[0030] a magnifying lens assembly arranged in the first mounting section, the magnifying lens assembly comprising a plurality of magnifying lenses arranged at intervals and having the same diameter as the first mounting section, and spacers arranged between adjacent magnifying lenses;

[0031] The rod-shaped lens assembly is partially arranged in the second mounting section and the other part extends axially into the third mounting section of the second sleeve. The diameter of the rod-shaped lens assembly is the same as that of the second mounting section.

[0032] To achieve the above-mentioned objectives, the present application provides an endoscope in a third aspect, comprising:

[0033] A housing having an accommodating space formed therein;

[0034] The lens assembly described in any of the above embodiments is arranged in the accommodating space;

[0035] A mirror seat is arranged at the far end of the accommodating space, the mirror seat and the mirror assembly are coaxially arranged to penetrate the housing, and the inner end of the mirror seat is connected to the mirror assembly;

[0036] The sheath tube has one end connected to the outer end of the lens base and the other end extending in a direction away from the lens base.

[0037] Different from the prior art, the present invention has the following advantages:

[0038] The mirror sheath protection structure of the present application includes a first sleeve and a second sleeve. Part of the rod-shaped mirror assembly is installed in the first sleeve, and the other part extends into the second sleeve. During installation, the rod-shaped mirror assembly can be first embedded in the first sleeve and fixed with glue. Then, the other part of the rod-shaped mirror assembly is inserted into the second sleeve to complete the installation of the mirror assembly. This helps to ensure the flatness of the small-sized crescent mirror at the head end of the rod-shaped mirror assembly and facilitates the glue fixing operation.

[0039] The second sleeve of the lens sheath protection structure of the present application can form a gap with the rod-shaped lens assembly, effectively reducing the external stress on the rod-shaped lens assembly, avoiding the possibility of the rod-shaped lens assembly being broken by external forces, and extending the service life;

[0040] The mirror sheath protection structure of the present application is arranged with a fourth sleeve, and the photoelectric conversion module is installed at one end of the fourth sleeve, which effectively avoids the interference of the metal material on the photoelectric conversion module and improves the imaging effect;

[0041] The endoscope of the present application can effectively prevent the rod-shaped lens group inside the shell from being affected by external stress, thereby increasing the service life, while ensuring the installation position accuracy and collimation of each lens, thereby improving the imaging effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] To more clearly illustrate the embodiments of this application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some of the embodiments described in this application. For those of ordinary skill in the art, other drawings can be derived from these drawings without inventive effort.

[0043] Figure 1 This is a schematic diagram of the explosion structure of an embodiment of the mirror sheath protection structure of the present application;

[0044] Figure 2 This is a schematic cross-sectional view of an embodiment of the mirror sheath protection structure of the present application;

[0045] Figure 3 yes Figure 2 A partial enlarged schematic diagram;

[0046] Figure 4 1 is a schematic cross-sectional view of another embodiment of the mirror sheath protection structure of the present application;

[0047] Figure 5This is a schematic cross-sectional view of another embodiment of the mirror sheath protection structure of the present application;

[0048] Figure 6 This is a structural diagram of an embodiment of the lens assembly of the present application;

[0049] Figure 7 This is a schematic cross-sectional view of an embodiment of the lens assembly of the present application;

[0050] Figure 8 This is a schematic structural diagram of an embodiment of the endoscope of the present application;

[0051] Figure 9 It is a schematic cross-sectional structural diagram of an embodiment of the endoscope of the present application.

[0052] As shown in the figure:

[0053] Mirror sheath protection structure 10;

[0054] First sleeve 100; first end 101; second end 102; first mounting section 103; second mounting section 104; extension section 105; first limiting step 106; second limiting step 107; second annular surface 108; first annular groove 1081; first annular boss 1082; third annular surface 109; first annular surface 110; first step surface 1101; fourth annular surface 111; third annular groove 1111; third annular boss 1112; annular ridge 112;

[0055] Second sleeve 200; third mounting section 201; first docking cavity 202; first docking section 2021; second annular boss 2022; second annular groove 2023; second docking section 2024; second step surface 2025;

[0056] Pressing ring 300;

[0057] Third sleeve 400; fourth mounting section 401; second docking cavity 402; fourth annular boss 4021; fourth annular groove 4022; transition section 403; first light expansion section 404;

[0058] Fourth sleeve 500; fifth mounting section 501; third docking cavity 502; second light expansion section 503;

[0059] Magnifying lens assembly 20; magnifying lens 201; spacer 202;

[0060] Rod lens group 30;

[0061] Housing 40; accommodating space 41; first space 411; second space 412;

[0062] Circuit components 50;

[0063] Mirror mount 60;

[0064] sheath 70;

[0065] Photoelectric conversion module 80;

[0066] Dust-proof lens 90. DETAILED DESCRIPTION

[0067] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0068] In order to solve the problems existing in the prior art when installing the magnifying lens group and the rod-shaped lens group at the rear end, the applicant has developed a new type of sheath protection structure, which can be applied to the handle of the endoscope for installing the magnifying lens group and the rod-shaped lens group, ensuring the position accuracy and collimation of each lens, and solving the problem of difficult gluing and fixing when installing the lens group.

[0069] Specifically, see Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the explosion structure of an embodiment of the mirror sheath protection structure of the present application. Figure 2 It is a schematic cross-sectional view of an embodiment of the mirror sheath protection structure of the present application.

[0070] like Figure 1 and Figure 2 As shown, the lens sheath protection structure 10 includes a first sleeve 100 and a second sleeve 200 arranged in sequence along the axial direction. The first sleeve 100 and the second sleeve 200 are coaxially arranged. The axial direction is parallel to the direction of light propagation, so that the light formed by the small objective lens can pass through the through-channels inside the second sleeve 200 and the first sleeve 100 in sequence.

[0071] The first sleeve 100 includes a first end 101 and a second end 102 that are oppositely disposed, and a through passage inside the first sleeve 100 includes a first mounting section 103 extending to the first end 101 and a second mounting section 104 extending to the second end 102 .

[0072] The first mounting section 103 is used to mount the magnifying lens assembly, and the second mounting section 104 is used to mount a portion of the rod-shaped lens assembly.

[0073] Since the magnifications of the magnifying lens assembly and the rod lens assembly are different, the diameter of the magnifying lens assembly is generally larger than that of the rod lens assembly. Therefore, the diameter of the first mounting section 103 should be set larger than the diameter of the second mounting section 104 .

[0074] The second sleeve 200 is arranged on one side of the second end 102 of the first sleeve 100 , and the through passage inside the second sleeve 200 includes a third mounting section 201 for accommodating a portion of the rod-shaped lens assembly protruding from the second mounting section 104 .

[0075] As can be appreciated, based on the above structure, the magnifying lens assembly can be first installed in the first mounting section 103, the rod-shaped lens assembly portion can be embedded in the second mounting section 104, and then glued and fixed. The remaining portion of the rod-shaped lens assembly can then be inserted into the second sleeve 200 to complete the lens assembly installation. Since only the portion of the rod-shaped lens assembly 30 inserted into the second mounting section 104 needs to be glued and fixed, the depth is greatly reduced, which helps ensure the flatness of the small-sized crescent lens at the tip of the rod-shaped lens assembly 30 and facilitates the glue-fixing operation.

[0076] Furthermore, in order to improve the installation position accuracy of the magnifying lens group 20 and the rod-shaped lens group 30, the through channel inside the first sleeve 100 also includes an extension section 105 that penetrates and connects the first mounting section 103 and the second mounting section 104. The diameter of the extension section 105 is smaller than that of the first mounting section 103 and the second mounting section 104, so that a first limiting step 106 is formed between the extension section 105 and the first mounting section 103, and a second limiting step 107 is formed between the extension section 105 and the second mounting section 104.

[0077] Through the design of the limiting step, the mirror group can be installed to a position that is at odds with the limiting step when installing the mirror group, ensuring its installation accuracy.

[0078] Since the rod-shaped lens assembly is relatively long, typically about 20 mm, and has a diameter of only 3 to 5 mm, in order to prevent the rod-shaped lens assembly 30 from being broken by stress perpendicular to the axial direction or resonance when the second sleeve 200 is subjected to stress, a gap can be formed between the hole wall of the third mounting section 201 and the rod-shaped lens assembly in this embodiment to provide a strain buffer space for the second sleeve 200 and prevent stress from being transmitted to the rod-shaped lens assembly 30.

[0079] Specifically, in one embodiment, the width of the gap may be greater than or equal to 0.01 mm to ensure sufficient buffer space.

[0080] Based on similar considerations, the length of the rod-shaped lens assembly inserted into the second mounting section 104 should not be too long, thereby reducing the impact of stress on the first sleeve 100 on the rod-shaped lens assembly. For example, in one embodiment, the axial length of the second mounting section 104 can be one-tenth to one-third of the overall axial length of the rod-shaped lens assembly 30, thereby ensuring that the axial length of the portion of the rod-shaped lens assembly inserted into the second mounting section 104 is one-tenth to one-third of the overall axial length of the rod-shaped lens assembly.

[0081] In order to facilitate the installation of the lens group, in this embodiment, the end of the first end 101 and the end face of the second end 102 of the first sleeve 100 are both frustum surfaces with a cone angle pointing to the middle of the first sleeve 100. On the one hand, the frustum can be used for guidance during the installation of the lens group, and on the other hand, it can also guide the glue to the inside of the first sleeve 100 during dispensing to avoid glue overflow.

[0082] Of course, in other embodiments, only one end surface of the first sleeve 100 may be arranged as a frustum, or the end surface may be other feasible guide surface structures, which can achieve the effect of this embodiment.

[0083] In order to realize the installation of the second sleeve 200 in the endoscope, the sheath protection structure 10 can also include a pressure ring 300, which is installed on the outer annular surface of the second sleeve 200 away from the first sleeve 100 and is used to connect the second sleeve 200 and the mirror base.

[0084] The following describes in detail the connection method of the first sleeve 100 and the second sleeve 200 in the above embodiment. Figure 3 , Figure 3 yes Figure 2 A partial enlarged schematic diagram of the middle A.

[0085] like Figure 3 As shown, the through channel inside the second sleeve 200 also includes a first docking cavity 202 located on the side of the third installation section 201 close to the first sleeve 100. The first sleeve 100 can be embedded in the first docking cavity 202 to connect and fix the first sleeve 100 and the second sleeve 200.

[0086] Specifically, the outer wall of the first sleeve 100 near the second end 102 can form a second annular surface 108 and a third annular surface 109 in sequence along the direction of the second end 102 pointing to the first end 101, and the diameters of the second annular surface 108 and the third annular surface 109 can increase successively, thereby forming a step structure between the second annular surface 108 and the third annular surface 109.

[0087] One end of the second annular surface 108 close to the third annular surface 109 is recessed inward to form a first annular groove 1081 , and one end of the second annular surface 108 away from the third annular surface 109 is convex outward to form a first annular boss 1082 .

[0088] The first docking cavity 202 may include a first docking section 2021 that matches the second annular surface 108, and the inner wall of the first docking section 2021 is protruding away from the outer wall to form a second annular boss 2022 that cooperates and engages with the first annular groove 1081, and the inner wall of the first docking section 2021 is also recessed toward the outer wall to form a second annular groove 2023 that cooperates and engages with the first annular boss 1082.

[0089] Based on the above-mentioned clamping structure, the first sleeve 100 and the second sleeve 200 can be clamped and fixed. At the same time, the step structure between the second annular surface 108 and the third annular surface 109 can be offset and limited against the end face of the second sleeve 200 to avoid the first sleeve 100 being inserted too deep into the second sleeve 200 during installation.

[0090] It should be noted that in this embodiment, the second annular surface 108 is arranged with both grooves and boss structures. In other embodiments, the second annular surface 108 may also be arranged with only grooves or boss structures. Accordingly, the inner wall of the first docking section 2021 may also be arranged with only bosses or groove structures, and the clamping fixation of the two can also be achieved. In addition, in this embodiment, grooves and boss structures are respectively arranged at both ends of the second annular surface 108. In other embodiments, the grooves and boss structures may also be arranged at other positions of the second annular surface 108. The positions of the bosses and groove structures of the first docking section 2021 can be adjusted accordingly, and the clamping fixation of the first sleeve 100 and the second sleeve 200 can also be achieved.

[0091] In order to further improve the connection stability between the first sleeve 100 and the second sleeve 200 and meet the installation requirements of rod-shaped lens assemblies of different sizes, in this embodiment, a first annular surface 110 is further arranged on the outer wall of the first sleeve 100 near the first end. The first annular surface 110 is arranged on the side of the second annular surface 108 away from the third annular surface 109, and the diameter of the first annular surface 110 is smaller than that of the second annular surface 108, thereby forming a first step surface 1101 between the first annular surface 110 and the second annular surface 108.

[0092] The first docking cavity 202 may further include a second docking segment 2024 that matches the second annular surface 108 , thereby forming a second step surface 2025 between the second docking segment 2024 and the first docking segment 2021 .

[0093] During docking, the second annular surface 108 can be embedded in the second docking section 2024 , and the first step surface 1101 and the second step surface 2025 can abut against each other to form a limit, thereby ensuring the connection stability between the first sleeve 100 and the second sleeve 200 .

[0094] In particular, the axial length of the second docking section 2024 can be greater than the axial length of the second annular surface 108, thereby forming a gap between the second mounting section 104 and the third mounting section 201. This gap allows the sheath protection structure to adapt to rod-shaped lens assemblies of different lengths, meeting the installation requirements of different application scenarios. It should be noted that this embodiment only illustrates one feasible connection method for the first sleeve 100 and the second sleeve 200. In other embodiments, any commonly used connection method in the art can also be used to fix the first sleeve 100 and the second sleeve 200. For example, the inner wall of the first docking section 2021 and / or the second docking section 2024 can be provided with an internal thread, and the outer wall of the second annular surface 108 and / or the first annular surface 110 can be provided with an external thread. The first sleeve 100 and the second sleeve 200 can be connected and fixed by a threaded structure, or the first sleeve 100 and the second sleeve 200 can be directly glued and fixed, or the first sleeve 100 and the second sleeve 200 can be fixed using other snap-fit ​​structures, all of which can achieve the effects of this embodiment.

[0095] Since the imaging accuracy of the endoscope is high and the final imaging is at the cell level, any tiny particles landing on the lens surface will seriously block the imaging effect. In order to prevent tiny dust from entering the installed magnifying glass group and rod lens group, please refer to Figure 4 , Figure 4 It is a schematic cross-sectional view of another embodiment of the mirror sheath protection structure of the present application.

[0096] like Figure 4 As shown, the mirror sheath protection structure 10 can also include a third sleeve 400, which is arranged on one side of the first end 101 of the first sleeve 100 and is coaxial with the first sleeve 100. One end of the third sleeve 400 is sleeved on the first sleeve 100, and the through channel inside the third sleeve 400 includes a fourth mounting segment 401 located at one end away from the first sleeve 100. The fourth mounting segment 401 is used to install a dust-proof lens to form an enclosed space inside the third sleeve 400 that is connected to the first mounting segment 103.

[0097] It is understandable that after the magnifying glass assembly is installed, the third sleeve 400 equipped with the dustproof lens can be installed on the first sleeve 100 to prevent dust from falling on the lens surface and facilitate subsequent maintenance.

[0098] Specifically, a fourth annular surface 111 is arranged on the outer annular surface of the first sleeve 100 close to the first end 101 , and one axial end of the fourth annular surface 111 is recessed inward to form a third annular groove 1111 , and the other axial end is protruded outward to form a third annular boss 1112 .

[0099] The through channel inside the third sleeve 400 also includes a second docking cavity 402 whose size matches the fourth annular surface 111 , and the inner wall of the second docking cavity 402 is arranged with a fourth annular boss 4021 and a fourth annular groove 4022 that match the third annular groove 1111 and the third annular boss 1112 .

[0100] Based on the boss structure, the first sleeve 100 and the third sleeve 400 can be fixed by clamping. It should be noted that in this embodiment, the axial ends of the fourth annular surface 111 are respectively arranged with grooves and boss structures. In other embodiments, the fourth annular surface 111 can also be provided with only bosses or grooves. Correspondingly, the inner wall of the second docking cavity 402 can also be provided with only grooves or bosses. The grooves and bosses can also be arranged in other positions. The positions of the bosses and grooves of the second docking cavity 402 can be adjusted accordingly to achieve the clamping fixation of the two.

[0101] To ensure the permeability of light within the third sleeve 400, the through-channel within the third sleeve 400 further includes a transition section 403 and a first light-expanding section 404. The diameter of the transition section 403 can be substantially the same as the diameter of the first mounting section 103, thereby allowing light to enter the third sleeve 400 with low loss after passing through the first sleeve 100. Of course, in other embodiments, the diameter of the transition section 403 can also be larger than the diameter of the first mounting section 103, as long as the diameter of the transition section 403 is no smaller than the diameter of the first mounting section 103, and the effects of this embodiment can be achieved in all cases.

[0102] The first light expanding section 404 penetrates and connects the transition section 403 and the fourth installation section 401 , and the diameter of the first light expanding section 404 gradually increases in a direction away from the transition section 403 .

[0103] It should be noted that, similar to the fixing method of the first sleeve 100 and the second sleeve 200, this embodiment only shows a feasible connection method of the first sleeve 100 and the third sleeve 400. In other embodiments, any commonly used connection method in the field can also be applied to the fixation between the first sleeve 100 and the third sleeve 400, such as threaded connection, adhesive fixation, other snap-fit ​​structure fixation, etc., which can achieve the effect of this embodiment and will not be repeated here.

[0104] In the above embodiments, in order to ensure the strength of the mirror sheath structure, the first sleeve 100, the second sleeve 200 and the third sleeve 400 can be made of metal. In order to achieve the installation between the mirror assembly and the photoelectric conversion module and avoid the metal sleeve from interfering with the photoelectric conversion module, please refer to Figure 5 , Figure 5 This is a schematic cross-sectional view of another embodiment of the mirror sheath protection structure of the present application.

[0105] like Figure 5 As shown, the mirror sheath protection structure 10 can also include a fourth sleeve 500, which is sleeved on the third sleeve 400, and the through channel inside the fourth sleeve 500 includes a fifth mounting section 501 located at one end away from the third sleeve 400, and the fifth mounting section 501 is used to install the photoelectric conversion module.

[0106] The fourth sleeve 500 may be a sleeve made of insulating material, thereby isolating the lens assembly and the photoelectric conversion module to avoid interference problems.

[0107] In order to ensure the transmittance of light in the fourth sleeve 500, the through channel inside the fourth sleeve 500 also includes a third docking cavity 502 and a second light expansion section 503. The third docking cavity 502 matches the outer wall size of the third sleeve 400, and the third sleeve 400 is embedded in the third docking cavity 502.

[0108] The second light expanding section 503 penetrates and connects the third docking cavity 502 and the fifth installation section 501 , and the diameter of the second light expanding section 503 gradually increases in a direction away from the third docking cavity 502 .

[0109] In order to fix the fourth sleeve 500, the first sleeve 100 may further include a circle of annular ridges 112 arranged on the outer ring surface. The end of the fourth sleeve 500 may be against the annular ridges 112 and fixedly connected to the annular ridges 112 by bolts.

[0110] The mirror sheath protection structure 10 according to the above-mentioned embodiments can effectively ensure the installation position accuracy and collimation of the mirror assembly, and helps to simplify the dispensing operation during the installation process, thereby reducing the influence of external stress on the mirror assembly.

[0111] This application also provides a lens assembly, please refer to Figure 6 and Figure 7 , Figure 6 This is a structural diagram of an embodiment of the lens assembly of the present application. Figure 7 It is a schematic cross-sectional view of an embodiment of the lens assembly of the present application.

[0112] like Figure 6 and Figure 7As shown, the lens assembly includes the lens sheath protection structure 10 of the above embodiment, a magnifying lens assembly 20 and a rod-shaped lens assembly 30 .

[0113] The magnifying lens assembly 20 is arranged in the first mounting section 103 , and may include a plurality of magnifying lenses 201 arranged at intervals and having the same diameter as the first mounting section 103 , and spacers 202 arranged between adjacent magnifying lenses 201 .

[0114] The magnifying lens 201 located on the inner side can abut against the first limiting step 106 , thereby ensuring the position accuracy of each magnifying lens 201 .

[0115] The rod-shaped lens assembly 30 is partially arranged in the second mounting section 104 and the other portion extends axially into the third mounting section 201 of the second sleeve 200. The diameter of the rod-shaped lens assembly 30 is the same as the diameter of the second mounting section 104, and a gap greater than or equal to 0.01 mm is formed between the rod-shaped lens assembly 30 and the hole wall of the third mounting section 201.

[0116] Based on this structure, a portion of the rod-shaped lens assembly 30 can be first inserted into the second installation section 104 and fixed with glue, and then the remaining portion can be inserted into the second sleeve 200 to achieve installation of the rod-shaped lens assembly 30 .

[0117] At the same time, the rod-shaped lens assembly 30 does not contact the second sleeve 200 , effectively reducing the influence of external stress on the rod-shaped lens assembly 30 .

[0118] In this embodiment, the lens assembly further includes a photoelectric conversion module 80 disposed in the fifth mounting section 501 of the fourth sleeve 500 . The photoelectric conversion module 80 is configured to receive the optical signal amplified by the magnifying lens assembly 20 and convert it into an electrical signal.

[0119] In this embodiment, the lens assembly further includes a dustproof lens 90 disposed in the fourth mounting section 401 of the third sleeve 400 . The dustproof lens 90 is used to prevent dust from entering the interior of the lens assembly and facilitates maintenance and replacement.

[0120] This application also provides an endoscope, see Figure 8 and Figure 9 , Figure 8 This is a schematic structural diagram of an embodiment of the endoscope of the present application. Figure 9 It is a schematic cross-sectional structural diagram of an embodiment of the endoscope of the present application.

[0121] like Figure 8 and Figure 9 As shown, the endoscope includes a shell 40, which may be in the shape of a handle for easy gripping by an operator; an accommodating space 41 is formed inside the shell 40, and the lens assembly of the above embodiment is arranged inside the accommodating space 41.

[0122] Specifically, the housing 40 can be divided into a first space 411 for arranging optical path components and a second space 412 for arranging circuit components 50. The first space 411 and the second space 412 can be arranged at a certain angle.

[0123] A mirror base 60 may be disposed at a distal end of the first space 411 , ie, an end away from an operator during operation. The mirror base 60 may extend axially and pass through the housing 40 .

[0124] The inner end of the lens holder 60 can be connected to the pressure ring 300 of the lens assembly to achieve the installation of the lens assembly; the distal end of the lens holder 60 can be connected to a sheath 70, which is used for intervention into the patient's body. The inside of the sheath 70 can be arranged with multiple lenses for relaying light, such as rod-shaped lenses arranged at intervals, which will not be repeated here.

[0125] The endoscope based on the above structure can effectively prevent the rod-shaped lens group 30 inside the shell 40 from being affected by external stress, thereby increasing its service life, while ensuring the installation position accuracy and collimation of each lens, thereby improving the imaging effect.

[0126] For those skilled in the art, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0127] The foregoing descriptions of specific exemplary embodiments of the present application are for purposes of illustration and description. These descriptions are not intended to limit the present application to the precise forms disclosed, and it is apparent that many variations and modifications are possible in light of the foregoing teachings. The exemplary embodiments are selected and described for the purpose of explaining the specific principles of the present application and their practical application, thereby enabling those skilled in the art to realize and utilize the various exemplary embodiments of the present application and various options and modifications. The scope of the present application is intended to be defined by the claims and their equivalents.

Claims

1. A mirror sheath protection structure, characterized in that: include: a first sleeve including a first end and a second end opposite to each other, wherein a through passage inside the first sleeve includes a first mounting section extending to the first end for mounting the magnifying lens assembly and a second mounting section extending to the second end for mounting a portion of the rod-shaped lens assembly; a second sleeve coaxially disposed with the first sleeve and fixedly connected to the second end of the first sleeve, wherein a through passage within the second sleeve includes a third mounting section for accommodating a portion of the rod-shaped lens assembly protruding from the first sleeve, and a gap is formed between an inner wall of the third mounting section and the rod-shaped lens assembly; The through passage inside the second sleeve further includes a first docking cavity located on a side of the third mounting section close to the second end, and the first sleeve is embedded in the first docking cavity to connect and fix the first sleeve and the second sleeve; Wherein, the first docking cavity, the third mounting section, the first mounting section and the second mounting section are arranged on the same optical axis; The outer wall of the first sleeve near the second end is formed with a first annular surface, a second annular surface, and a third annular surface arranged in sequence along the second end toward the first end, wherein the diameters of the first annular surface, the second annular surface, and the third annular surface increase in sequence to form a step structure between the second annular surface and the third annular surface; The first docking cavity includes a first docking section that matches the size of the second annular surface, and a second docking section that matches the size of the first annular surface. The step structure is abutted against the end of the second sleeve for limiting position.

2. The mirror sheath protection structure according to claim 1, characterized in that: The second annular surface is inwardly concave to form a first annular groove, and / or the second annular surface is outwardly convex to form a first annular boss; The inner wall of the first docking section is protruded away from the outer wall to form a second annular boss that cooperates and engages with the first annular groove, and / or the inner wall of the first docking section is recessed toward the outer wall to form a second annular groove that cooperates and engages with the first annular boss.

3. The mirror sheath protection structure according to claim 1, characterized in that: A first external thread is arranged on the second annular surface and / or the third annular surface, a first internal thread matching the first external thread is arranged on the inner wall of the first docking section and / or the second docking section, and the first sleeve and the second sleeve are threadedly connected by the first external thread and the first internal thread.

4. The mirror sheath protection structure according to claim 1, characterized in that: The axial length of the portion of the rod-shaped lens assembly installed in the second installation section is one tenth to one third of the entire axial length of the rod-shaped lens assembly.

5. The mirror sheath protection structure according to claim 1, characterized in that: The through channel inside the first sleeve also includes an extension section that connects the first mounting section and the second mounting section. The diameter of the extension section is smaller than the first mounting section and the second mounting section, and the diameter of the first mounting section is larger than the diameter of the second mounting section, so that a first limiting step is formed between the extension section and the first mounting section, and a second limiting step is formed between the extension section and the second mounting section.

6. The mirror sheath protection structure according to claim 1, characterized in that: A gap greater than or equal to 0.01 mm is formed between the inner wall of the third mounting section and the rod-shaped lens assembly.

7. The mirror sheath protection structure according to claim 1, characterized in that: The end surface of the first end and / or the end surface of the second end is a frustum surface with a cone angle pointing to the middle of the first sleeve.

8. The mirror sheath protection structure according to claim 1, characterized in that: It also includes a third sleeve, which is coaxially arranged with the first sleeve and fixedly connected to the first end of the first sleeve. The through channel inside the third sleeve includes a fourth mounting section located at the end away from the first sleeve. The fourth mounting section is used to install a dust-proof lens to form an enclosed space inside the third sleeve that is connected to the first mounting section.

9. The mirror sheath protection structure according to claim 8, characterized in that: A fourth annular surface is formed on the outer wall of the first sleeve near the first end, and the fourth annular surface is inwardly concave to form a third annular groove, and / or the fourth annular surface is outwardly convex to form a third annular boss; The through channel inside the third sleeve also includes a second docking cavity located near one end of the first sleeve, and the fourth annular surface is embedded in the second docking cavity. The second docking cavity matches the size of the fourth annular surface, and the inner wall of the second docking cavity protrudes away from the outer wall to form a fourth annular boss that cooperates and engages with the third annular groove, and / or the inner wall of the second docking cavity is recessed toward the outer wall to form a fourth annular groove that cooperates and engages with the third annular boss.

10. The mirror sheath protection structure according to claim 8, characterized in that: A fourth annular surface is formed on the outer wall of the first sleeve near the first end, and a second external thread is arranged on the fourth annular surface. The through channel inside the third sleeve also includes a second docking cavity located near one end of the first sleeve, and the inner wall of the second docking cavity is arranged with a second internal thread matching the second external thread. The first sleeve and the third sleeve are threadedly connected by the second external thread and the second internal thread.

11. The mirror sheath protection structure according to claim 8, characterized in that: The through channel inside the third sleeve also includes a transition section and a first light expansion section. The diameter of the transition section is not less than the diameter of the first mounting section. The first light expansion section connects the transition section and the fourth mounting section, and the diameter of the first light expansion section gradually increases in the direction away from the transition section.

12. The mirror sheath protection structure according to claim 8, characterized in that: It also includes a fourth sleeve, which is sleeved on the third sleeve, and the through channel inside the fourth sleeve includes a fifth installation section located at one end away from the third sleeve, and the fifth installation section is used to install the photoelectric conversion module.

13. The mirror sheath protection structure according to claim 12, characterized in that: The through channel inside the fourth sleeve also includes a third docking cavity and a second light expansion section. The third docking cavity matches the outer wall size of the third sleeve, and the third sleeve is embedded in the third docking cavity. The second light expansion section connects the third docking cavity and the fifth installation section, and the diameter of the second light expansion section gradually increases in the direction away from the third docking cavity.

14. The mirror sheath protection structure according to claim 12, characterized in that: The first sleeve includes a circle of annular ridges arranged on the outer ring surface, the end of the fourth sleeve is connected to the annular ridges, and the fourth sleeve is an insulating sleeve.

15. The mirror sheath protection structure according to claim 1, characterized in that: It also includes a pressing ring, which is installed on the outer annular surface of the second sleeve at one end away from the first sleeve, and is used to connect the second sleeve and the mirror seat.

16. A lens assembly, characterized in that: include: The mirror sheath protection structure according to any one of claims 1 to 15; a magnifying lens assembly arranged in the first mounting section, the magnifying lens assembly comprising a plurality of magnifying lenses arranged at intervals and having the same diameter as the first mounting section, and spacers arranged between adjacent magnifying lenses; The rod-shaped lens assembly is partially arranged in the second mounting section and the other part extends axially into the third mounting section of the second sleeve. The diameter of the rod-shaped lens assembly is the same as that of the second mounting section.

17. An endoscope, characterized in that: include: A housing having an accommodating space formed therein; The lens assembly according to claim 16 is arranged in the accommodating space; A mirror seat is arranged at the far end of the accommodating space, the mirror seat and the mirror assembly are coaxially arranged to penetrate the housing, and the inner end of the mirror seat is connected to the mirror assembly; The sheath tube has one end connected to the outer end of the lens base and the other end extending in a direction away from the lens base.

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