Endoscope rear end structure

Abstract

The invention discloses a rear end structure of an endoscope. It comprises a shell, a shell mounting groove is provided on the rear end surface of the shell, an objective lens assembly is installed in the shell mounting groove, the objective lens assembly comprises an objective lens assembly and an objective lens mounting seat matching the shell mounting groove, the objective lens mounting seat is fixed in the shell mounting groove, the objective lens assembly is installed in the objective lens mounting seat and is slidably connected with the objective lens mounting seat, the objective lens assembly comprises objective lens 1, objective lens seat and objective lens 2, objective lens 1 and objective lens 2 are respectively fixed at the two ends of the objective lens seat and the three are placed on the same straight line, an eyepiece is fixed at the rear end of the objective lens mounting seat, and the eyepiece and the objective lens assembly are placed on the same straight line. The beneficial effects of the invention are: the original rear end fixing structure is injection molded and integrated, and the objective lens system is integratedly designed, so that the assembly and debugging of the endoscope are more convenient and quick, and the imaging quality of the eyepiece is significantly improved; the glue coating surface of the objective lens system is increased, so that the packaging quality is significantly improved.

Description

Technical Field

[0001] The present invention relates to the technical field related to endoscopes, and in particular to a rear end structure of an endoscope. Background Art

[0002] Nasal endoscope is an ENT device, an optical device that can perform detailed examination of the nasal cavity. It generally refers to a hard tube endoscope with angles ranging from 0 to 90 degrees. Due to good lighting and its relatively thin diameter of only 2.7-4.0mm, the nasal endoscope can easily pass through the narrow nasal cavity and the structure in the nasal passage to examine the internal structure of the nasal cavity, nasopharynx and even the sinuses. It is an important means of diagnosing sinusitis and nasal polyps. Through the matching surgical instruments, it can also perform fine treatment of sinusitis and nasal polyps, allowing the surgery to reach areas that traditional surgery cannot reach.

[0003] The existing hardware parts of the back end of the rigid tube endoscope include a pressure lens barrel, a spring, a fixing seat, an adjustment plate, a fixing ring, a light beam, a light cap and an eyepiece seat; the objective lens system includes objective lens 1, objective lens 1, objective lens 2, objective lens 3 and objective lens 4. The numerous parts make the installation and debugging of the rigid tube endoscope difficult, and the optical center axis is easily deviated during assembly, which greatly reduces the accuracy of the rigid tube endoscope. Summary of the invention

[0004] The present invention aims to overcome the shortcomings of the existing hard tube endoscope in the prior art, such as the large number of parts, great difficulty in installation and debugging, and low precision, and provides an endoscope rear end structure that reduces the number of hardware parts to ensure the accuracy of the optical center axis.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An endoscope rear end structure comprises a shell, a shell mounting groove is provided on the rear end surface of the shell, an objective lens assembly is installed in the shell mounting groove, the objective lens assembly comprises an objective lens assembly and an objective lens mounting seat matching the shell mounting groove, the objective lens mounting seat is fixed in the shell mounting groove, the objective lens assembly is installed in the objective lens mounting seat and is slidably connected to the objective lens mounting seat, the objective lens assembly comprises objective lens 1, objective lens seat and objective lens 2, the objective lens 1 and objective lens 2 are respectively fixed at two ends of the objective lens seat and the three are placed on the same straight line, an eyepiece is fixed at the rear end of the objective lens mounting seat, and the eyepiece and the objective lens assembly are placed on the same straight line.

[0007] A shell mounting groove is provided on the rear end surface of the shell, and an objective lens assembly is installed in the shell mounting groove. The objective lens assembly includes an objective lens assembly and an objective lens mounting seat matching the shell mounting groove. The objective lens mounting seat is fixed in the shell mounting groove. The objective lens assembly is installed in the objective lens mounting seat and is slidably connected with the objective lens mounting seat. The objective lens assembly includes objective lens 1, objective lens seat and objective lens 2. Objective lens 1 and objective lens 2 are respectively fixed at two ends of the objective lens seat and the three are placed on the same straight line. An eyepiece is fixed at the rear end of the objective lens mounting seat, and the eyepiece and the objective lens assembly are placed on the same straight line. The original rear end fixing structure is injection molded and integrated. At the same time, the objective lens system is integratedly designed. The redesigned rear end fixing structure and objective lens system make the assembly and debugging of the endoscope more convenient and quick, and the imaging quality of the eyepiece is significantly improved. At the same time, the glue coating surface of the objective lens system is increased, so that the packaging quality is significantly improved.

[0008] Preferably, a fixing threaded hole and a side mounting groove are provided on the side wall of the shell mounting groove, a fastening screw is connected to the inner thread of the fixing threaded hole, the objective lens mounting seat includes a fixing seat, and a fixing seat groove matching the fixing threaded hole is provided on the outer side surface of the fixing seat, the fixing seat is fixed in the shell mounting groove by the cooperation of the fixing seat groove and the fastening screw, the side mounting groove is placed at the front end of the objective lens assembly and a light source seat is fixed thereon, the fixing method of the objective lens mounting seat is simple and convenient, and assembly and debugging are more convenient and quick; the light source seat is used to provide a light source for the endoscope.

[0009] Preferably, a fixing sleeve is fixed to the rear end of the fixing seat, the objective lens assembly is placed in the fixing sleeve and is slidably connected to the fixing sleeve, the eyepiece is fixed to the rear end of the fixing sleeve, and adjustment through holes are provided on the side walls of the four sides of the fixing sleeve, and adjusting bolts are provided in the adjusting through holes. A slider is fixed on the side wall of the adjusting through hole, and a sliding groove matching the slider is provided on the side of the adjusting bolt. The adjusting bolt is slidably connected to the adjusting through hole through the cooperation of the sliding groove and the slider. During debugging, the position of the objective lens assembly is adjusted by adjusting bolts on the upper, lower, left and right sides of the fixing sleeve so that the axis center line of the objective lens assembly coincides with the axis center line of the eyepiece to ensure that the deviation of the optical center axis is minimized.

[0010] Preferably, one end of the adjusting bolt is threadedly connected with an adjusting nut, and the outer side wall of the fixed sleeve is provided with a nut mounting groove that matches the adjusting nut. The adjusting nut is installed in the nut mounting groove and is rotatably connected to the nut mounting groove. The other end of the adjusting bolt is fixed with an arc-shaped adjusting block that matches the objective lens assembly, and the inner side wall of the fixed sleeve is provided with an adjusting block mounting groove that matches the arc-shaped adjusting block. The operator can adjust the position of the objective lens assembly by rotating the adjusting nut; the design of the arc-shaped adjusting block fits the objective lens assembly better, which greatly improves the debugging accuracy.

[0011] Preferably, a stator is fixed to the front end of the fixed seat, and a plurality of positioning rods are fixed to the edge of the rear end surface of the stator. A positioning groove matching the positioning rod is provided on the front end surface of the fixed seat. The stator is installed at the front end of the fixed seat through the cooperation of the positioning rod and the positioning groove. The cooperation of the positioning rod and the positioning groove avoids the influence of the spring on the concentricity during assembly injection molding, ensures the coincidence of the axis center line of the fixed seat and the axis center line of the stator, and improves the injection molding accuracy between the stator and the fixed seat.

[0012] Preferably, an elastic expansion ring is sleeved on the side of the fixing seat, and the elastic expansion ring is placed on the side of the positioning groove. A pressure rod matching the positioning groove is fixed on the inner wall of the elastic expansion ring. The pressure rod passes through the side wall of the positioning groove and is placed inside the positioning groove and is slidably connected to the positioning groove. A slot matching the pressure rod is provided on the side of the positioning rod. The shape of the end of the positioning rod and the shape of the end of the pressure rod are arc-shaped. Under the elastic action of the elastic expansion ring, the pressure rod presses the stator from all sides at the same time, firmly fixing the stator on the fixing seat, avoiding the influence of the gap between the positioning rod and the positioning groove on the concentricity during assembly injection molding, and further improving the injection molding accuracy of the stator and the fixing seat.

[0013] Preferably, a chamber is provided between the centering member and the fixed seat, a compression barrel is slidably connected in the chamber, a spring is provided between the compression barrel and the chamber, one end of the spring is fixed to the rear end face of the compression barrel, and the other end of the spring is fixed to the rear end face of the chamber, a connecting through hole is provided between the chamber and the fixed sleeve, the compression barrel, the connecting through hole, the objective lens assembly and the eyepiece are all placed on the same straight line, the compression barrel can slide in the chamber for fixing the lens tube; the spring plays a role in pressing and fixing the compression barrel; under the centering action of the centering member, it is ensured that the axis lines of the compression barrel, the connecting through hole, the objective lens assembly and the eyepiece are all on a straight line, thereby greatly improving the structural accuracy of the endoscope.

[0014] Preferably, a shell through hole is provided on the bottom surface of the shell mounting groove, a mirror tube matching the shell through hole is installed in the shell through hole, the mirror tube and the shell through hole are slidably connected, a centering sub through hole matching the mirror tube is provided on the front end surface of the centering sub, the mirror tube passes through the centering sub through hole and is placed in the chamber and is installed on the pressing lens barrel, the mirror tube, the connecting through hole and the objective lens assembly are all placed on the same straight line, one end of the mirror tube is fixed on the pressing lens barrel, and the other end is used to extend into the patient's nose, which can facilitate the doctor to observe and operate.

[0015] Preferably, a fixing pin is fixed on the outer wall of the mirror tube, an opening groove matching the fixing pin is provided on the front end surface of the shell, an annular groove matching the fixing pin is provided on the side wall of the through hole of the shell, the opening groove is communicated with the annular groove, a positioning groove matching the fixing pin is provided on the front end surface of the annular groove, the positioning groove and the opening groove are perpendicular to each other, when the mirror tube is installed, the fixing pin is fixed in the positioning groove through the opening groove and the annular groove, thereby fixing the mirror tube.

[0016] Preferably, an objective lens shell is provided at the rear end of the shell, a shell buckle is provided at the front end of the objective lens shell, a shell slot matching the shell buckle is provided on the side of the shell, the objective lens shell is clamped with the shell through the cooperation of the shell buckle and the shell slot, a light shielding cap is fixed to the rear end of the objective lens shell, the eyepiece is located inside the light shielding cap, an eyepiece seat is provided at the rear end of the objective lens shell, the eyepiece seat and the objective lens shell are fixedly connected, the objective lens shell plays a protective role of the objective lens assembly, wherein the clamping method is simple and convenient, and easy to install and disassemble; the added light shielding cap can prevent light from leaking from the eyepiece seat and affecting the correct exposure.

[0017] The beneficial effects of the present invention are as follows: the original rear end fixing structure is injection molded and integrated, and the objective lens system is integratedly designed. The redesigned rear end fixing structure and objective lens system make the assembly and debugging of the endoscope more convenient and quick, and the imaging quality of the eyepiece is significantly improved; the glue coating surface of the objective lens system is increased, so that the packaging quality is significantly improved; the position of the objective lens assembly is adjusted by adjusting bolts on the upper, lower, left and right sides of the fixed sleeve, so that the axis of the objective lens assembly coincides with the axis of the eyepiece to ensure that the deviation of the optical center axis is minimized; the influence of the spring on the concentricity during assembly injection molding is avoided by the cooperation of the positioning rod and the positioning groove, the coincidence of the axis of the fixing seat and the axis of the centering member is ensured, and the injection molding accuracy between the centering member and the fixing seat is improved; the pressure rod presses the centering member from all sides at the same time under the elastic action of the elastic expansion ring, and the centering member is firmly fixed on the fixing seat, so that the influence of the gap between the positioning rod and the positioning groove on the concentricity during assembly injection molding is avoided, and the injection molding accuracy between the centering member and the fixing seat is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention;

[0019] Figure 2 It is the left side view of the shell;

[0020] Figure 3 yes Figure 2 Cross-sectional view at AA in the middle;

[0021] Figure 4 yes Figure 1 A schematic diagram of the structure of the middle objective lens mounting seat;

[0022] Figure 5 yes Figure 4 A rear cross-sectional view of

[0023] Figure 6 yes Figure 5 Enlarged view of point C in the middle;

[0024] Figure 7 yes Figure 4 Cross-section at the middle BB;

[0025] Figure 8 It is a schematic diagram of the structure of the objective lens assembly;

[0026] Fig. 9 yes Figure 4 A front sectional view of

[0027] Fig.10 yes Fig. 9 The enlarged view of point D in the middle;

[0028] Fig.11 It is an assembly diagram of the objective lens mount and objective lens assembly;

[0029] Fig.12 yes Figure 1 Schematic diagram of the structure of the middle mirror tube;

[0030] Fig.13 yes Figure 1 Schematic diagram of the structure of the buckle part of the middle shell.

[0031] In the figure: 1. Side mounting groove, 2. Light source seat, 3. Objective lens mounting seat, 4. Eyepiece seat, 5. Objective lens shell, 6. Shell buckle, 7. Shell slot, 8. Shell mounting groove, 9. Shell, 10. Mirror tube, 11. Opening groove, 12. Shell through hole, 13. Fixed threaded hole, 14. Fastening screw, 15. Annular groove, 16. Positioning slot, 17. Fixed seat groove, 18. Fixed seat, 19. Fixed sleeve, 20. Adjusting nut, 21. Adjusting bolt, 22. Nut mounting groove , 23. Adjustment through hole, 24. Slider, 25. Slide groove, 26. Arc adjustment block, 27. Adjustment block mounting groove, 28. Objective lens assembly, 29. Objective lens 2, 30. Objective lens seat, 31. Objective lens 1, 32. Centering son, 33. Chamber, 34. Spring, 35. Positioning rod, 36. Positioning groove, 37. Pressing lens barrel, 38. Centering son through hole, 39. Elastic expansion ring, 40. Pressure rod, 41. Slot, 42. Connecting through hole, 43. Eyepiece, 44. Fixing pin, 45. Sunshade cap. DETAILED DESCRIPTION

[0032] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0033] like Figure 1 In the embodiment described, an endoscope rear end structure includes a housing 9, a housing mounting groove 8 is provided on the rear end surface of the housing 9, and an objective lens assembly is installed in the housing mounting groove 8, such as Figure 4 and Figure 8 As shown, the objective lens assembly includes an objective lens assembly 28 and an objective lens mounting seat 3 that matches the housing mounting groove 8, as shown in FIG. Fig.11As shown, the objective lens mounting seat 3 is fixed in the housing mounting groove 8, and the objective lens assembly 28 is installed in the objective lens mounting seat 3 and is slidably connected to the objective lens mounting seat 3.

[0034] like Figure 8 and Fig.11 As shown, the objective lens assembly 28 includes 31, an objective lens seat 30 and an objective lens 29. The objective lens 1 31 and the objective lens 29 are respectively fixed at the two ends of the objective lens seat 30 and the three are placed on the same straight line. An eyepiece 43 is fixed to the rear end of the objective lens mounting seat 3, and the eyepiece 43 and the objective lens assembly 28 are placed on the same straight line.

[0035] like Figure 3 and Figure 4 As shown, a fixing threaded hole 13 and a side mounting groove 1 are provided on the side wall of the housing mounting groove 8, and a fastening screw 14 is connected to the inner thread of the fixing threaded hole 13. The objective lens mounting seat 3 includes a fixing seat 18, and a fixing seat groove 17 matching the fixing threaded hole 13 is provided on the outer surface of the fixing seat 18. The fixing seat 18 is fixed in the housing mounting groove 8 by the cooperation of the fixing seat groove 17 and the fastening screw 14. Figure 1 As shown, the side mounting groove 1 is disposed at the front end of the objective lens assembly and a light source seat 2 is fixed thereon.

[0036] like Figure 5 and Fig.11 As shown, a fixed sleeve 19 is fixed to the rear end of the fixed seat 18, the objective lens assembly 28 is placed in the fixed sleeve 19 and is slidably connected to the fixed sleeve 19, and the eyepiece 43 is fixed to the rear end of the fixed sleeve 19, as shown in FIG. Figure 6 and Figure 7 As shown, adjustment holes 23 are provided on the side walls of the four sides of the fixed sleeve 19, an adjustment bolt 21 is provided in the adjustment hole 23, a slider 24 is fixed on the side wall of the adjustment hole 23, a slide groove 25 matching the slider 24 is provided on the side of the adjustment bolt 21, and the adjustment bolt 21 is slidably connected with the adjustment hole 23 through the cooperation of the slide groove 25 and the slider 24.

[0037] like Figure 6 and Figure 7 As shown, one end of the adjusting bolt 21 is threadedly connected with an adjusting nut 20, and a nut mounting groove 22 matching the adjusting nut 20 is provided on the outer wall of the fixed sleeve 19. The adjusting nut 20 is installed in the nut mounting groove 22 and is rotatably connected to the nut mounting groove 22. The other end of the adjusting bolt 21 is fixed with an arc-shaped adjusting block 26 matching the objective lens assembly 28, and an adjusting block mounting groove 27 matching the arc-shaped adjusting block 26 is provided on the inner wall of the fixed sleeve 19.

[0038] like Fig. 9As shown, a stator 32 is fixed to the front end of the fixed seat 18, and a plurality of positioning rods 35 are fixed to the edge of the rear end surface of the stator 32. A positioning groove 36 matching the positioning rod 35 is provided on the front end surface of the fixed seat 18, and the stator 32 is installed at the front end of the fixed seat 18 through the cooperation of the positioning rod 35 and the positioning groove 36.

[0039] like Fig.10 As shown, an elastic expansion ring 39 is sleeved on the side of the fixing seat 18, and the elastic expansion ring 39 is placed on the side of the positioning groove 36. A pressure rod 40 matching the positioning groove 36 is fixed on the inner wall of the elastic expansion ring 39. The pressure rod 40 passes through the side wall of the positioning groove 36 and is placed inside the positioning groove 36 and is slidably connected to the positioning groove 36. A card groove 41 matching the pressure rod 40 is provided on the side of the positioning rod 35, and the shape of the end of the positioning rod 35 and the shape of the end of the pressure rod 40 are both arc-shaped.

[0040] like Fig. 9 As shown, a chamber 33 is provided between the centering member 32 and the fixed seat 18, a pressure lens barrel 37 is slidably connected in the chamber 33, a spring 34 is provided between the pressure lens barrel 37 and the chamber 33, one end of the spring 34 is fixed to the rear end surface of the pressure lens barrel 37, and the other end of the spring 34 is fixed to the rear end surface of the chamber 33, and a connecting through hole 42 is provided between the chamber 33 and the fixed sleeve 19, as shown in FIG. Fig.11 As shown, the pressure lens barrel 37, the connecting through hole 42, the objective lens assembly 28 and the eyepiece 43 are all placed on the same straight line.

[0041] like Figure 2 and Figure 3 As shown, a housing through hole 12 is provided on the bottom surface of the housing installation groove 8, and a mirror tube 10 matching the housing through hole 12 is installed in the housing through hole 12, and the mirror tube 10 and the housing through hole 12 are slidably connected, as shown in FIG. Fig. 9 As shown, the front end surface of the centering member 32 is provided with a centering member through hole 38 matching the mirror tube 10. Fig.11 As shown, the mirror tube 10 passes through the centering through hole 38 and is placed in the chamber 33 and is installed on the pressing barrel 37. The mirror tube 10, the connecting through hole 42 and the objective lens assembly 28 are all placed on the same straight line.

[0042] like Fig.12 As shown, a fixing pin 44 is fixed on the outer wall of the mirror tube 10. Figure 2 and Figure 3 As shown, an opening groove 11 matching the fixing pin 44 is provided on the front end face of the shell 9, an annular groove 15 matching the fixing pin 44 is provided on the side wall of the shell through hole 12, the opening groove 11 is connected to the annular groove 15, and a positioning groove 16 matching the fixing pin 44 is provided on the front end face of the annular groove 15, and the positioning groove 16 and the opening groove 11 are perpendicular to each other.

[0043] like Figure 1 and Fig.13 As shown, an objective lens shell 5 is provided at the rear end of the shell 9, a shell buckle 6 is provided at the front end of the objective lens shell 5, a shell slot 7 matching the shell buckle 6 is provided on the side of the shell 9, the objective lens shell 5 is snap-connected with the shell 9 through the cooperation of the shell buckle 6 and the shell slot 7, a light-shielding cap 45 is fixed to the rear end of the objective lens shell 5, the eyepiece 43 is located inside the light-shielding cap 45, and an eyepiece seat 4 is sleeved on the rear end of the objective lens shell 5, and the eyepiece seat 4 and the objective lens shell 5 are fixedly connected.

[0044] Assembly, injection molding and commissioning:

[0045] First, the spring 34 and the fixed sleeve 19 are fixed to the front and rear ends of the fixing seat 18 respectively, and the pressing lens barrel 37 is fixed on the spring 34. Then, the positioning rod 35 of the centering member 32 is inserted into the positioning groove 36 of the fixing seat 18 for positioning and assembly. At the same time, the pressing lens barrel 37 is slidably connected inside the centering member 32 (when the positioning rod 35 is inserted, the pressing rod 40 is propped up, and the elastic expansion ring 39 expands outward. When the slot 41 on the positioning rod 35 moves to the pressing rod 40, the pressing rod 40 is snapped into the slot 41 under the elastic recovery action of the elastic expansion ring 39, and the positioning rod 35 is fixed, thereby fixing the centering member 32 firmly on the fixing seat 18, so that the axis center lines of the centering member 32 and the fixing seat 18 coincide), and then the assembled objective lens mounting seat 3 is integrally formed by injection molding.

[0046] The assembled objective lens mount 3 is installed into the housing mounting groove 8, keeping the fixing threaded hole 13 and the fixing seat groove 17 aligned, and then the fastening screw 14 is rotated to fix it, and then the mirror tube 10 is passed through the housing through hole 12 and the centering sub through hole 38 and fixed on the pressing lens barrel 37 (when installing the mirror tube 10, the fixing pin 44 passes through the opening groove 11 into the annular groove 15, and then the mirror tube 10 is rotated 90° and then released, and the fixing pin 44 is clamped into the positioning groove 16 perpendicular to the opening groove 11 under the elastic force of the spring 34).

[0047] The objective lens 1 31, the objective lens seat 30 and the objective lens 2 29 are integrated into the objective lens assembly 28 by injection molding, and the molded objective lens assembly 28 is placed in the fixed sleeve 19, and then the eyepiece 43 is fixed to the rear end of the fixed sleeve 19, and the light source seat 2 is installed to start debugging. The position of the objective lens assembly 28 is adjusted by the adjusting bolts 21 on the upper, lower, left and right sides of the fixed sleeve 19 until the axis lines of the mirror tube 10, the objective lens assembly 28 and the eyepiece 43 coincide.

[0048] After debugging is completed, the objective lens shell 5 is buckled on the rear end of the shell 9 through the cooperation of the shell slot 7 and the shell buckle 6, and the light shielding cap 45 is fixed to the rear end of the objective lens shell 5, and then the eyepiece seat 4 is put on the rear end of the objective lens shell 5 and fixed, and the debugging and assembly are completed.

Claims

1. An endoscope rear end structure, characterized in that: The invention comprises a housing (9), a housing mounting groove (8) being provided on the rear end surface of the housing (9), an objective lens assembly being installed in the housing mounting groove (8), the objective lens assembly comprising an objective lens assembly (28) and an objective lens mounting seat (3) matching the housing mounting groove (8), the objective lens mounting seat (3) being fixed in the housing mounting groove (8), the objective lens assembly (28) being installed in the objective lens mounting seat (3) and being slidably connected to the objective lens mounting seat (3), the objective lens assembly (28) comprising an objective lens 1 (31), an objective lens seat (30) and an objective lens 2 (29), the objective lens 1 (31) and the objective lens 2 (29) being respectively fixed at two ends of the objective lens seat (30) and the three being placed in the same An eyepiece (43) is fixed to the rear end of the objective lens mounting seat (3), and the eyepiece (43) and the objective lens assembly (28) are placed on the same straight line. A fixing threaded hole (13) and a side mounting groove (1) are provided on the side wall of the housing mounting groove (8). A fastening screw (14) is connected to the inner thread of the fixing threaded hole (13). The objective lens mounting seat (3) comprises a fixing seat (18). A fixing seat groove (17) matching the fixing threaded hole (13) is provided on the outer side surface of the fixing seat (18). The fixing seat (18) is fixed in the housing mounting groove (8) by the cooperation of the fixing seat groove (17) and the fastening screw (14). The mounting groove (1) is arranged at the front end of the objective lens assembly and a light source seat (2) is fixed thereon; a centering member (32) is fixed at the front end of the fixing seat (18); a plurality of positioning rods (35) are fixed at the edge of the rear end surface of the centering member (32); a positioning groove (36) matching the positioning rod (35) is arranged on the front end surface of the fixing seat (18); the centering member (32) is installed at the front end of the fixing seat (18) through the cooperation of the positioning rod (35) and the positioning groove (36); an elastic expansion ring (39) is sleeved on the side surface of the fixing seat (18); the elastic expansion ring (39) is arranged on the side surface of the positioning groove (36); and the inner side wall of the elastic expansion ring (39) is provided with a plurality of positioning rods (35) matching the positioning rod (35). A pressure rod (40) matching the positioning groove (36) is fixed thereto. The pressure rod (40) penetrates the side wall of the positioning groove (36) and is disposed inside the positioning groove (36) and is slidably connected to the positioning groove (36). A clamping groove (41) matching the pressure rod (40) is provided on the side of the positioning rod (35). The shape of the end of the positioning rod (35) and the shape of the end of the pressure rod (40) are both arc-shaped. The original rear end fixing structure is injection molded to form an integrated structure. The cooperation of the positioning rod and the positioning groove avoids the influence of the spring on the concentricity during assembly injection molding, ensures the coincidence of the axis center line of the fixing seat and the axis center line of the stator, and improves the injection molding accuracy between the stator and the fixing seat.

2. The rear end structure of an endoscope according to claim 1, characterized in that: A fixing sleeve (19) is fixed to the rear end of the fixing seat (18), the objective lens assembly (28) is placed in the fixing sleeve (19) and is slidably connected to the fixing sleeve (19), the eyepiece (43) is fixed to the rear end of the fixing sleeve (19), and adjustment through holes (23) are provided on the side walls of the four sides of the fixing sleeve (19), an adjustment bolt (21) is provided in the adjustment through hole (23), a slider (24) is fixed to the side wall of the adjustment through hole (23), a sliding groove (25) matching the slider (24) is provided on the side of the adjustment bolt (21), and the adjustment bolt (21) is slidably connected to the adjustment through hole (23) through the cooperation of the sliding groove (25) and the slider (24).

3. The endoscope rear end structure according to claim 2, characterized in that: One end of the adjusting bolt (21) is threadedly connected to an adjusting nut (20); an outer side wall of the fixed sleeve (19) is provided with a nut mounting groove (22) matching the adjusting nut (20); the adjusting nut (20) is mounted in the nut mounting groove (22) and is rotatably connected to the nut mounting groove (22); an arc-shaped adjusting block (26) matching the objective lens assembly (28) is fixed to the other end of the adjusting bolt (21); and an adjusting block mounting groove (27) matching the arc-shaped adjusting block (26) is provided on the inner side wall of the fixed sleeve (19).

4. The endoscope rear end structure according to claim 1, characterized in that: A chamber (33) is provided between the centering member (32) and the fixed seat (18), a pressure lens barrel (37) is slidably connected in the chamber (33), a spring (34) is provided between the pressure lens barrel (37) and the chamber (33), one end of the spring (34) is fixed to the rear end surface of the pressure lens barrel (37), and the other end of the spring (34) is fixed to the rear end surface of the chamber (33), a connecting through hole (42) is provided between the chamber (33) and the fixed sleeve (19), and the pressure lens barrel (37), the connecting through hole (42), the objective lens assembly (28) and the eyepiece (43) are all arranged on the same straight line.

5. The endoscope rear end structure according to claim 4, characterized in that: A shell through hole (12) is provided on the bottom surface of the shell mounting groove (8), a mirror tube (10) matching the shell through hole (12) is installed in the shell through hole (12), the mirror tube (10) and the shell through hole (12) are slidably connected, a centering through hole (38) matching the mirror tube (10) is provided on the front end surface of the centering part (32), the mirror tube (10) passes through the centering through hole (38) and is placed in the chamber (33) and is installed on the lens pressing barrel (37), and the mirror tube (10), the connecting through hole (42) and the objective lens assembly (28) are all placed on the same straight line.

6. The endoscope rear end structure according to claim 5, characterized in that: A fixing pin (44) is fixed on the outer side wall of the mirror tube (10); an opening groove (11) matching the fixing pin (44) is provided on the front end surface of the housing (9); an annular groove (15) matching the fixing pin (44) is provided on the side wall of the housing through hole (12); the opening groove (11) is communicated with the annular groove (15); a positioning groove (16) matching the fixing pin (44) is provided on the front end surface of the annular groove (15); the positioning groove (16) and the opening groove (11) are perpendicular to each other.

7. The endoscope rear end structure according to claim 1, characterized in that: The rear end of the housing (9) is provided with an objective lens housing (5), the front end of the objective lens housing (5) is provided with a housing buckle (6), the side of the housing (9) is provided with a housing buckle (7) matching the housing buckle (6), the objective lens housing (5) is snap-fitted with the housing (9) through the cooperation of the housing buckle (6) and the housing buckle (7), the rear end of the objective lens housing (5) is fixed with a light shielding cap (45), the eyepiece (43) is located inside the light shielding cap (45), the rear end of the objective lens housing (5) is sleeved with an eyepiece seat (4), and the eyepiece seat (4) and the objective lens housing (5) are fixedly connected.

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