Zoom mechanism, zoom lens, and endoscope

Abstract

The utility model relates to medical instrument technical field discloses a zoom mechanism, zoom lens and endoscope, zoom mechanism includes: main mirror barrel, zoom lens component, transmission part and transmission pin, and the lateral wall of main mirror barrel is equipped with guide groove, zoom lens component is located in main mirror barrel, and can move relative to the axial movement of main mirror barrel, the front end of transmission part is slidably equipped in the outer circumferential side of main mirror barrel, and the other end of transmission pin is connected with the front end of transmission part, and the rear end of transmission part is equipped with push -and -pull part, and the axis of push -and -pull part is coaxial with the axis of zoom lens component, transmission pin passes through guide groove, and one end of transmission pin is connected with the lateral wall of zoom lens component, and the other end is connected with transmission part, in above -mentioned scheme, the driving force of push -and -pull part can be along the same axis transmission to zoom lens component, to make zoom lens component along the axial direction movement of main mirror barrel, and not easy to deviate, can guarantee that the optical axis of zoom lens component does not deviate, and moves smoothly.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a zoom mechanism, a zoom lens and an endoscope. Background Technology

[0002] An endoscope is a medical device that allows observation of the body's cavities. Currently available medical endoscopes, however, cannot clearly visualize the tissue structure within these cavities. For precise diagnosis of lesions, it is necessary to clearly see changes in the openings of glandular ducts, microvessels, and capillaries on the surface of the digestive tract mucosa, and even to visualize cells and their nuclei.

[0003] To improve the clarity and accuracy of endoscopic observation, optically zoomable endoscopes have been proposed. Zoomable endoscopes help to accurately determine the pathological form of lesions and improve the accuracy of biopsies.

[0004] However, existing zoom endoscopes generate a certain overturning torque on the zoom lens when zooming. On the one hand, this can cause the zoom lens to tilt and the optical axis to deviate. On the other hand, it can cause the zoom tube to jam, resulting in uneven zooming and thus affecting operation.

[0005] Therefore, how to improve the smoothness of zoom mechanism during zooming is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0006] The purpose of this invention is to provide a zoom mechanism, zoom lens, and endoscope that can effectively ensure that the optical axis of the zoom lens does not deviate and improve the smoothness of the zoom lens during movement.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A zoom mechanism, comprising:

[0009] The main lens barrel has a guide groove on its side wall, and the length of the guide groove extends parallel to the axis of the main lens barrel.

[0010] A zoom lens assembly, wherein the zoom lens assembly is disposed within the main lens barrel and is axially movable relative to the main lens barrel;

[0011] A transmission component, the front end of which is slidably disposed on the outer periphery of the main lens barrel, the other end of which is connected to the front end of the transmission pin, and the rear end of which is provided with a push-pull part, the axis of which is coaxial with the axis of the zoom lens assembly;

[0012] A drive pin passes through the guide groove, with one end of the drive pin connected to the outer wall of the zoom lens assembly and the other end connected to the front end of the transmission component.

[0013] In some embodiments, the sidewall of the main lens barrel is provided with a plurality of guide grooves evenly distributed along the circumferential direction, and a transmission pin is respectively inserted into each guide groove.

[0014] In some embodiments, the transmission component includes a transmission cylinder, which includes a front cylindrical section and a rear cylindrical section. The front cylindrical section is sleeved on the outer periphery of the main lens barrel, and the rear end of the rear cylindrical section is provided with an end plate. The push-pull portion is provided on the end plate.

[0015] In some embodiments, the sidewall of the rear cylindrical section is provided with a lead wire opening.

[0016] In some embodiments, the push-pull part is a wire drawing part, and a protrusion is provided on the rear end face of the end plate. A connecting hole is provided in the protrusion, and the front end of the wire drawing part is fixed in the connecting hole.

[0017] In some embodiments, the transmission component includes a front ring, a connecting rod, and a rear end plate. The two ends of the connecting rod are respectively connected to the front ring and the rear end plate. The front ring is sleeved on the outer periphery of the main lens barrel, and the push-pull portion is disposed on the rear end face of the rear end plate.

[0018] In some embodiments, the transmission component includes a plurality of push-pull wires that are connected one-to-one with the transmission pins, and the rear ends of each push-pull wire are connected together to form a push-pull rod; wherein, the push-pull part is the push-pull rod.

[0019] In some embodiments, the zoom lens assembly includes a zoom barrel and a zoom lens, the zoom lens is disposed inside the zoom barrel, a first pin hole is provided on the outer side wall of the zoom barrel, a second pin hole is provided on the side wall of the front end of the transmission member, and the two ends of the transmission pin are respectively fixedly inserted into the first pin hole and the second pin hole.

[0020] In some embodiments, the line connecting the first pin hole and the second pin hole is perpendicular to the axis of the main lens barrel.

[0021] A zoom lens includes the zoom mechanism described in any one of the above claims, and further includes a lens mount, a fixed lens, a front lens barrel, and a front lens element. The rear end of the main lens barrel is connected to the front end of the lens mount, the fixed lens element is disposed at the rear end of the main lens barrel, the front lens barrel is connected to the front end of the main lens barrel, and the front lens element is disposed inside the front lens barrel.

[0022] In some embodiments, the zoom lens further includes an image sensor, a cable, and a protective housing. The image sensor is disposed on the lens mount, the cable is connected to the image sensor and located inside the protective housing, the front end of the protective housing is connected to the rear end of the lens mount, and the rear end of the protective housing extends out from the side of the transmission member.

[0023] In some embodiments, the protective housing includes a front housing, an intermediate transition housing, and a rear housing. The front housing is connected to the mirror mount, the intermediate transition housing is located between the front housing and the rear housing, and the rear housing is located outside the transmission member. The axis of the front housing is coaxial with the axis of the mirror mount, and the axis of the rear housing is not coaxial with the axis of the front housing and is parallel to the axis of the front housing.

[0024] An endoscope comprising the zoom lens described in any of the preceding claims.

[0025] Compared with existing technologies, the above technical solution has the following advantages:

[0026] This utility model provides a zoom mechanism, including: a main lens barrel, a zoom lens assembly, a transmission component, and a transmission pin. The rear end of the transmission component has a push-pull portion, the axis of which is coaxial with the axis of the zoom lens assembly. The transmission pin fixes the transmission component to the zoom lens assembly. When the user pushes the transmission component axially via the push-pull portion, the transmission component transmits the driving force to the zoom lens assembly through the transmission pin, thereby realizing the zoom function of the zoom lens assembly. Since one end of the transmission pin is fixed to the zoom lens assembly, the point of force application of the zoom lens assembly is close to the center of the zoom lens assembly, resulting in a smaller negative torque. Furthermore, because the axis of the push-pull portion is coaxial with the axis of the zoom lens assembly, the driving force of the push-pull portion can be transmitted to the zoom lens assembly along the same axis, making the zoom lens assembly move along the axis of the main lens barrel, reducing the likelihood of tilting or deviation. This effectively ensures that the optical axis of the zoom lens assembly does not deviate and significantly improves the smoothness of the zoom lens assembly's movement.

[0027] The zoom lens provided by this utility model achieves coaxiality of the lens elements through the cooperation of the lens mount and lens barrel. The entire zoom lens is aligned on a single axis, effectively preventing optical axis deviation and facilitating reliable zooming. Furthermore, due to the inclusion of the aforementioned zoom mechanism, it also possesses the advantages of a zoom mechanism, which will not be elaborated further here.

[0028] The endoscope provided by this utility model, since it includes the above-mentioned zoom lens, also has the advantages of zoom mechanism and zoom lens, which will not be elaborated here. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0030] Figure 1 A cross-sectional view of a zoom lens provided for a specific embodiment of this utility model;

[0031] Figure 2 An exploded view of a zoom lens provided for a specific embodiment of this utility model;

[0032] Figure 3 A schematic diagram of the structure of a first transmission component of a zoom mechanism provided for a specific embodiment of this utility model;

[0033] Figure 4 A schematic diagram of the structure of a second transmission component of a zoom mechanism provided in a specific embodiment of this utility model;

[0034] Figure 5 This is a schematic diagram of the third transmission component of a zoom mechanism provided in a specific embodiment of the present utility model.

[0035] The attached figures are labeled as follows:

[0036] 10-Main lens barrel, 101-Fixed lens, 11-Guide groove;

[0037] 20-Zoom lens assembly, 21-Zoom barrel, 211-First pin hole, 22-Zoom lens;

[0038] 30-Transmission component, 31-Transmission cylinder, 311-Front cylindrical section, 3111-Second pin hole, 312-Rear cylindrical section, 3121-Lead wire port, 313-End plate, 3131-Arc-shaped clearance groove, 314-Protrusion, 321-Front ring, 322-Connecting rod, 323-Rear end plate, 33-Push-pull wire, 331-Push-pull rod;

[0039] 40-Drive pin;

[0040] 50 - Push-pull section;

[0041] 60 - Mirror mount; 61 - Image sensor;

[0042] 70 - Protective shell, 71 - Front shell, 72 - Intermediate transition shell, 73 - Rear shell;

[0043] 80 - Front lens barrel, 81 - Front lens element. Detailed Implementation

[0044] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0045] Please refer to Figures 1 to 5 .

[0046] The zoom mechanism provided in this embodiment of the utility model is as follows: Figure 1 As shown, the zoom mechanism includes: a main lens barrel 10, a zoom lens assembly 20, a transmission component 30, and a transmission pin 40. The main lens barrel 10 has a guide groove 11 on its side wall, the length of which extends parallel to the axis of the main lens barrel 10. The zoom lens assembly 20 is disposed within the main lens barrel 10 and is axially movable relative to the main lens barrel 10, i.e., the zoom lens assembly 20 is slidably connected to the main lens barrel 10. The front end of the transmission component 30 is slidably disposed on the outer periphery of the main lens barrel 10, and the other end of the transmission pin 40 is connected to the front end of the transmission component 30. The rear end of the transmission component 30 has a push-pull portion 50, the axis of which is coaxial with the axis of the zoom lens assembly 20. The transmission pin 40 passes through the guide groove 11, with one end connected to the outer side wall of the zoom lens assembly 20 and the other end connected to the front end of the transmission component 30. The transmission pin 40 can be a cylindrical pin or a square pin.

[0047] In this embodiment, the front end is the end closer to the endoscope lens (i.e., the end furthest from the user), and the rear end is the end closer to the endoscope operating part (i.e., the end closer to the user). In a zoom lens, a fixed lens 101 and a front lens 81 are typically included, the zoom lens assembly 20 is located between the fixed lens 101 and the front lens 81, the end of the transmission member 30 near the front lens 81 is its front end, and the other end of the transmission member 30 is its rear end.

[0048] In the above scheme, the transmission pin fixes the transmission component to the zoom lens assembly. When the user pushes the transmission component 30 axially through the push-pull part 50, the transmission component 30 transmits the driving force to the zoom lens assembly 20 through the transmission pin 40, thereby realizing the zoom function of the zoom lens assembly 20. Since one end of the transmission pin 40 is fixed to the zoom lens assembly 20, the point of force application of the zoom lens assembly 20 is close to the center of the zoom lens assembly 20, so the negative torque is small. Moreover, since the axis of the push-pull part 50 is coaxial with the axis of the zoom lens assembly 20, the driving force of the push-pull part 50 can be transmitted to the zoom lens assembly 20 along the same axis, so that the zoom lens assembly 20 moves along the axis of the main lens barrel 10, and is not prone to tilting or deviation. This effectively ensures that the optical axis of the zoom lens assembly 20 does not deviate and effectively improves the smoothness of the zoom lens assembly 20's movement.

[0049] In some embodiments, the sidewall of the main lens barrel 10 is provided with a plurality of guide grooves 11 evenly distributed along the circumferential direction, and a transmission pin 40 passes through each guide groove 11. For example, two guide grooves 11 can be provided on the sidewall of the main lens barrel 10, with the distribution angle of the two guide grooves 11 being 180°; or three guide grooves 11 can be provided on the sidewall of the main lens barrel 10, with the distribution angle of the three guide grooves 11 being 120°; more guide grooves 11 can also be provided on the sidewall of the main lens barrel 10, and the number and distribution angle of the guide grooves 11 can be set according to actual needs. Furthermore, each guide groove has the same size, and each transmission pin has the same shape and size. The number of transmission pins 40 is the same as the number of guide grooves 11. The distance between the point of force of the transmission pin 40 acting on the zoom lens assembly 20 and the center of the optical axis is equal and small, and the plurality of transmission pins 40 are evenly distributed along the circumferential direction, so the negative torque on the zoom lens assembly 20 can cancel each other out, which can effectively improve the smoothness of the zoom lens assembly during movement.

[0050] In some embodiments, such as Figure 3 As shown, the transmission component 30 includes a transmission cylinder 31, which includes a front cylindrical section 311 and a rear cylindrical section 312. The front cylindrical section 311 and the rear cylindrical section 312 are integrally formed. The front cylindrical section 311 is sleeved on the outer periphery of the main lens barrel 10, and the rear end of the rear cylindrical section 312 is provided with an end plate 313, which can be integrally formed on the rear end of the transmission cylinder 31. The push-pull part 50 is located on the central axis of the end plate 313, so that the axis of the push-pull part 50 is coaxial with the axis of the zoom lens assembly 20.

[0051] To facilitate cable routing within the transmission cylinder 31 and to facilitate the movement of the transmission cylinder 31, a cable guide port 3121 can be provided on the side wall of the rear cylindrical section 312. The cable guide port 3121 can be formed by removing a portion from the side wall of the rear cylindrical section 312, wherein, for example... Figure 3 As shown, the lead-in port 3121 can be a rectangular hole, large enough to allow the cable to pass through. Furthermore, an arc-shaped clearance groove 3131 can be provided on the end plate 313, and the lead-in port 3121 and the arc-shaped clearance groove 3131 can together form an area for the cable to pass through.

[0052] Specifically, the cable can be run through the protective housing 70 to connect with the image sensor 61. One end of the protective housing 70 is led out from the lead-in port 3121, and part of the outer side wall of the rear end of the protective housing 70 contacts the arc-shaped relief groove 3131. This layout can make the axis of the pushing part 50 parallel to the axis of the rear end of the protective housing 70, and can also reduce the overall size of the zoom lens.

[0053] Optionally, the push-pull part 50 is a wire drawing part, which needs to have a certain degree of hardness and low ductility, and can be made of steel wire rope, etc. A protrusion 314 is provided on the rear end face of the end plate 313, and the protrusion is located on the central axis of the end plate 313. The protrusion 314 can be integrally formed on the rear end face of the end plate 313, and a connecting hole is provided inside the protrusion 314, in which the front end of the wire is fixed. The protrusion 314 improves the ease of connection of the wire drawing part.

[0054] In some embodiments, such as Figure 4 As shown, the transmission component 30 includes a front ring 321, a connecting rod 322 and a rear end plate 323. The two ends of the connecting rod 322 are connected to the front ring 321 and the rear end plate 323 respectively. The front ring 321 is sleeved on the outer periphery of the main lens barrel 10. The front ring 321 is provided with a pin hole that cooperates with the transmission pin 40.

[0055] The number of connecting rods 322 can be multiple, with each connecting rod 322 having both ends connected to the front ring 321 and the rear plate 323, respectively. Specifically, both ends of the connecting rod 322 are connected to the front ring 321 and the rear plate 323 near their outer edges, creating a space between the front ring 321, the connecting rod 322, and the rear plate 323 for the cable to pass through. The connecting rods 322 can be connected in a detachable manner, such as by threaded connection. When it is necessary to adjust the distance between the front ring 321 and the rear plate 323, connecting rods 322 of different lengths can be used for connection.

[0056] The push-pull part 50 is located on the rear end face of the rear end plate 323. The push-pull part 50 can be a wire drawing part, and the specific implementation of the wire drawing part can be referred to the aforementioned embodiment. An arc-shaped clearance groove can be provided on the rear end plate 323, and part of the arc-shaped sidewall of the protective shell 70 through which the cable passes will contact the arc-shaped clearance groove. This allows the cable to be drawn out from the transmission member 30 parallel to the wire drawing part. This layout can protect the cable and effectively reduce the overall size of the zoom lens.

[0057] In some embodiments, such as Figure 5 As shown, the transmission component 30 includes multiple push-pull wires 33 that are connected one-to-one with the transmission pins 40. One end of the transmission pin 40 can extend from the guide groove 11 to facilitate the connection between the push-pull wires 33 and the transmission pin 40. The front end of the push-pull wire 33 can be fixed to the transmission pin 40 and extend out of one end of the guide groove 11. The rear ends of each push-pull wire 33 are connected together to form a push-pull rod 331 (the push-pull rod 331 is the aforementioned push-pull part 50). For example, the rear ends of multiple push-pull wires 33 can be spirally wound together. The multiple push-pull wires 33 are evenly distributed along the circumferential direction, so that the axis of the push-pull rod 331 is coaxial with the axis of the zoom lens assembly 20. By directly connecting the push-pull wires 33 to the transmission pins 40, the transmission cylinder 31, the front ring 321, the connecting rod 322, and the rear plate 323 can be eliminated, which can effectively simplify the structure, reduce its cost, and improve the convenience of maintenance.

[0058] In some embodiments, the zoom lens assembly 20 includes a zoom barrel 21 and a zoom lens 22. A first pin hole 211 is provided on the outer wall of the zoom barrel 21, and a second pin hole 3111 is provided on the transmission member 30. The first pin hole 211 and the second pin hole 3111 are correspondingly arranged. The two ends of the transmission pin 40 are respectively connected to the first pin hole 211 and the second pin hole 3111. The line connecting the first pin hole 211 and the second pin hole 3111 is perpendicular to the axis of the main lens barrel 10. In this embodiment, the zoom barrel 21 facilitates both the installation of the zoom lens 22 and the connection of the transmission pin 40. Furthermore, with the transmission pins 40 evenly distributed circumferentially and perpendicular to the axis of the main lens barrel 10, the driving forces are balanced, preventing lateral offset and improving the smoothness of the zoom lens movement.

[0059] This utility model embodiment also provides a zoom lens, including the zoom mechanism provided in any of the above embodiments, and further including a lens mount 60, a fixed lens 101, a front lens barrel 80, and a front lens element 81. The rear end of the main lens barrel 10 is connected to the front end of the lens mount 60. For example, the lens mount 60 is a cylindrical structure. The rear end of the main lens barrel 10 is provided with an insertion end. The outer diameter of the insertion end is smaller than the outer diameter of the barrel body of the main lens barrel 10. The insertion end is fixed inside the lens mount 60. By providing an insertion end at the rear end of the main lens barrel 10, it is easy to connect with the lens mount 60. The optical axis is aligned; the fixed lens 101 is located at the rear end of the main lens barrel 10, for example, it can be fixed in the inner hole of the insertion end. The front lens barrel 80 is connected to the front end of the main lens barrel 10. The front lens barrel 80 and the main lens barrel 10 can be connected by a stop, for example, a countersunk hole can be provided at the front end of the main lens barrel 10, and a connecting end is provided on the outer side of the rear end of the front lens barrel 80. The outer diameter of the connecting end is smaller than the outer diameter of its main structure. The connecting end is inserted into the countersunk hole, which can easily connect the two. The front lens 81 is located inside the front lens barrel 80. During installation, the front lens barrel 80, the front lens 81, the main lens barrel 10, the fixed lens 101, and the zoom lens assembly 20 can be pre-assembled into a module to facilitate the overall installation of the zoom lens. In addition, the above-mentioned zoom lens achieves the coaxiality of the lens axis through the cooperation of the lens mount and the lens barrel. The zoom lens as a whole is on a single axis, which can effectively prevent optical axis deviation and facilitate reliable zooming. For other beneficial effects of the zoom lens, please refer to the zoom mechanism provided in any of the above embodiments, which will not be repeated here.

[0060] In some embodiments, the zoom lens further includes an image sensor 61, a cable, and a protective housing 70. The image sensor 61 is mounted on the lens mount 60. For example, a retaining ring can be provided on the inner wall of the rear end of the lens mount 60, and the retaining ring is integrally formed within the lens mount 60. The image sensor 61 is fixed to the inner wall of the retaining ring. The cable is connected to the image sensor 61 and is located within the protective housing 70. The front end of the protective housing 70 is connected to the rear end of the lens mount 60. For example, the front end of the protective housing 70 can be fitted onto the outer peripheral surface of the rear end of the lens mount 60. The rear end of the protective housing 70 extends from the side of the transmission member 30 to avoid the push-pull part 50. The protective housing 70 effectively protects the image sensor 61 and the cable, thereby ensuring the working stability of the zoom lens. Moreover, the protective housing 70 is an irregularly shaped structure, with its rear end's central axis offset from the axis of the lens mount 60 towards the outer diameter direction, which facilitates cable routing while preventing the overall outer diameter of the zoom lens from becoming too large.

[0061] In some embodiments, the protective housing 70 includes a front housing 71, an intermediate transition housing 72, and a rear housing 73. The front housing 71 is connected to the lens mount 60, the intermediate transition housing 72 is located between the front housing 71 and the rear housing 73, and the rear housing 73 is located outside the transmission member 30. The axis of the front housing 71 is coaxial with the axis of the lens mount 60, and the axis of the rear housing 73 is parallel to the axis of the front housing 71. The outer diameter of the front housing 71 is larger than the outer diameter of the intermediate transition housing 72, the outer diameter of the intermediate transition housing 72 decreases from front to back, and the outer diameter of the rear housing 73 is smaller than the outer diameter of the intermediate transition housing 72. That is, the outer diameter of the protective housing 70 is larger at the front and smaller at the back, which can prevent the outer diameter of the zoom lens from being too large and is beneficial for application in scenarios with limited installation space, such as endoscopes.

[0062] This utility model embodiment also provides an endoscope, including the zoom lens provided in any of the above embodiments. Regarding the beneficial effects of the endoscope, please refer to the zoom mechanism and zoom lens provided in the above embodiments, which will not be repeated here.

[0063] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0064] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0065] The above provides a detailed description of the zoom mechanism, zoom lens, and endoscope provided by this utility model. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The descriptions of the embodiments above are merely for the purpose of helping to understand the core ideas of this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A zoom mechanism, characterized in that, include: The main lens barrel (10) has a guide groove (11) on its side wall, and the length extension direction of the guide groove (11) is parallel to the axis of the main lens barrel (10). A zoom lens assembly (20) is disposed inside the main lens barrel (10) and is axially movable relative to the main lens barrel (10); The transmission component (30) has its front end slidably disposed on the outer periphery of the main lens barrel (10), and its rear end is provided with a push-pull part (50), the axis of which is coaxial with the axis of the zoom lens assembly (20). A drive pin (40) passes through the guide groove (11), and one end of the drive pin (40) is connected to the outer wall of the zoom lens assembly (20), and the other end is connected to the front end of the drive member (30).

2. The zoom mechanism according to claim 1, characterized in that, The main lens barrel (10) has a plurality of guide grooves (11) evenly distributed along the circumference on its side wall, and a transmission pin (40) is respectively inserted in each guide groove (11).

3. The zoom mechanism according to claim 1, characterized in that, The transmission component (30) includes a transmission cylinder (31), which includes a front cylindrical section (311) and a rear cylindrical section (312). The front cylindrical section (311) is sleeved on the outer periphery of the main lens barrel (10), and the rear end of the rear cylindrical section (312) is provided with an end plate (313). The push-pull part (50) is provided on the end plate (313).

4. The zoom mechanism according to claim 3, characterized in that, The rear cylindrical section (312) has a lead wire opening (3121) on its side wall.

5. The zoom mechanism according to claim 3, characterized in that, The push-pull part (50) is a wire drawing part, and a protrusion (314) is provided on the rear end surface of the end plate (313). A connecting hole is provided in the protrusion (314), and the front end of the wire drawing part is fixed in the connecting hole.

6. The zoom mechanism according to claim 1, characterized in that, The transmission component (30) includes a front ring (321), a connecting rod (322), and a rear end plate (323). The two ends of the connecting rod (322) are connected to the front ring (321) and the rear end plate (323) respectively. The front ring (321) is sleeved on the outer periphery of the main lens barrel (10), and the push-pull part (50) is located on the rear end face of the rear end plate (323).

7. The zoom mechanism according to claim 1, characterized in that, The transmission component (30) includes a plurality of push-pull wires (33) that are connected one-to-one with the transmission pins (40), and the rear ends of each push-pull wire (33) are connected together to form a push-pull rod (331); wherein, the push-pull part (50) is the push-pull rod (331).

8. The zoom mechanism according to claim 1, characterized in that, The zoom lens assembly (20) includes a zoom barrel (21) and a zoom lens (22). The zoom lens (22) is disposed inside the zoom barrel (21). A first pin hole (211) is provided on the outer side wall of the zoom barrel (21). A second pin hole (3111) is provided on the side wall of the front end of the transmission member (30). The two ends of the transmission pin (40) are respectively fixedly inserted into the first pin hole (211) and the second pin hole (3111).

9. The zoom mechanism according to claim 8, characterized in that, The line connecting the first pin hole (211) and the second pin hole (3111) is perpendicular to the axis of the main lens barrel (10).

10. A zoom lens, characterized in that, The zoom mechanism according to any one of claims 1 to 9 further includes a lens mount (60), a fixed lens (101), a front lens barrel (80), and a front lens (81), wherein the rear end of the main lens barrel (10) is connected to the front end of the lens mount (60), the fixed lens (101) is disposed at the rear end of the main lens barrel (10), the front lens barrel (80) is connected to the front end of the main lens barrel (10), and the front lens (81) is disposed inside the front lens barrel (80).

11. The zoom lens according to claim 10, characterized in that, The zoom lens also includes an image sensor (61), a cable, and a protective housing (70). The image sensor (61) is mounted on the lens mount (60). The cable is connected to the image sensor (61) and is located inside the protective housing (70). The front end of the protective housing (70) is connected to the rear end of the lens mount (60), and the rear end of the protective housing (70) extends out from the side of the transmission member (30).

12. The zoom lens according to claim 11, characterized in that, The protective shell (70) includes a front shell (71), an intermediate transition shell (72), and a rear shell (73). The front shell (71) is connected to the mirror mount (60). The intermediate transition shell (72) is located between the front shell (71) and the rear shell (73). The rear shell (73) is located outside the transmission member (30). The axis of the front shell (71) is coaxial with the axis of the mirror mount (60). The axis of the rear shell (73) is not coaxial with the axis of the front shell (71) and is parallel to the axis of the front shell (71).

13. An endoscope, characterized in that, Includes the zoom lens as described in any one of claims 10 to 12.

Images