Zoom mechanism and endoscope

Abstract

The invention relates to the technical field of medical instruments, and particularly discloses a zoom mechanism, which comprises an installation lens cone, a lens cone, a zoom lens cone, a zoom lens cone and a zoom lens cone, and is characterized in that the installation lens cone is provided with an inner cavity and an installation part parallel to the axis of the inner cavity; at least part of the structure of the movable lens cone is accommodated in the inner cavity, and the movable lens cone can slide along the axial direction of the inner cavity; the traction component is fixedly connected with the movable lens cone so as to drive the movable lens cone to move in the axial direction of the inner cavity; the axial limiting component is arranged on the mounting part, the axial mounting position of the axial limiting component in the mounting part is adjustable, and a first limiting surface is arranged on one side, facing the movable lens barrel, of the axial limiting component; the movable lens cone or the traction component is provided with a second limiting surface opposite to the first limiting surface, and when the second limiting surface abuts against the first limiting surface, the movable lens cone is limited at the first zooming position. According to the zoom mechanism, errors caused by assembly can be reduced, adjustability and flexibility are improved, and the yield of the image transmission assembly can be improved. The invention further discloses an endoscope which also has the above technical effects.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and more specifically, to a zoom mechanism and an endoscope. Background Art

[0002] Optical magnification endoscopes can observe the lesion location more intuitively. Using the magnification function, details that cannot be observed by a conventional endoscope body can be achieved, such as the surface mucosa morphology. In the conventional mode, doctors use a low magnification to find the lesion location and then use optical zoom to magnify the image, which is more conducive to diagnosing the condition. The optical magnification endoscope mainly realizes optical zoom by moving a zoom lens in the objective optical system relative to a fixed lens along the optical axis through a zoom mechanism.

[0003] In the related art, the zoom position of a zoom mechanism with a simple structure is usually determined by a limiting structure. However, in the practical process, the inventors of the present application found that: affected by processing and assembly errors, the zoom position defined by the limiting structure may be deviated, ultimately resulting in poor images, and thus the image transmission yield of the product is relatively low. Summary of the Invention

[0004] In view of this, the purpose of the present application is to provide a zoom mechanism and an endoscope. The structural design of the zoom mechanism and the endoscope can effectively solve the problems of poor images caused by the deviation of the zoom position of the zoom mechanism and low image transmission yield.

[0005] In order to achieve the above purpose, the present application provides the following technical solutions:

[0006] A zoom mechanism, comprising:

[0007] A mounting barrel, having an inner cavity and a mounting portion arranged parallel to the axis of the inner cavity;

[0008] A moving barrel, at least part of its structure is accommodated in the inner cavity and can slide axially along the inner cavity;

[0009] A traction member, fixedly connected to the moving barrel to drive the moving barrel to move axially along the inner cavity;

[0010] An axial limiting member, arranged on the mounting portion and its axial mounting position in the mounting portion is adjustable. A first limiting surface is provided on the side of the axial limiting member facing the moving barrel;

[0011] A second limiting surface is provided on the moving barrel or the traction member opposite to the first limiting surface. When the traction member drives the moving barrel to move in the direction close to the axial limiting member and the second limiting surface abuts against the first limiting surface, the moving barrel is limited at the first zoom position.

[0012] Optionally, in the above zoom mechanism, the first limiting surface and the second limiting surface are arranged opposite to each other along the axial direction of the traction member.

[0013] Optionally, in the above zoom mechanism, the second limiting surface is arranged on the traction member.

[0014] Optionally, in the above zoom mechanism, the traction member includes an actuator, a traction piece, and a guide post connected in sequence. The guide post is fixedly connected to the moving lens barrel, and the second limiting surface is provided on one side of the guide post facing the axial limiting member.

[0015] Optionally, in the above zoom mechanism, the axial limiting member is arranged between the moving lens barrel and the actuator. The traction piece is slidably disposed within the axial limiting member, and the second limiting surface is provided at one end of the guide post connected to the traction piece.

[0016] Optionally, in the above zoom mechanism, a blind hole is axially recessed at one end of the guide post connected to the traction piece. The traction piece is inserted and fixed within the blind hole, and the end face of one end of the guide post connected to the traction piece forms the second limiting surface.

[0017] Optionally, in the above zoom mechanism, the axial limiting member has a guide hole close to the moving lens barrel and a through hole connected to the guide hole. The aperture of the guide hole is larger than the aperture of the through hole to form the first limiting surface at the connection between the guide hole and the through hole. The guide post is inserted into the guide hole, and the traction piece extends out from the through hole to be connected to the actuator. The guide post can axially move along the guide hole under the traction of the traction piece.

[0018] Optionally, in the above zoom mechanism, the guide post and the guide hole are in clearance fit, and the clearance is not greater than the maximum tolerable deviation of the optical axis of the optical system maintained by the zoom mechanism.

[0019] Optionally, in the above zoom mechanism, one end of the axial limiting member away from the moving lens barrel protrudes from the end face of the mounting lens barrel by a preset length.

[0020] Optionally, in the above zoom mechanism, the axial limiting member is threadedly connected to the mounting portion;

[0021] Or,

[0022] One of the axial limiting member and the mounting portion is provided with a sliding groove, and the other of the axial limiting member and the mounting portion is provided with a pin. The pin is inserted into the sliding groove and its fixed position within the sliding groove is adjustable.

[0023] Optionally, in the above zoom mechanism, a dispensing groove is provided at one end of the mounting portion away from the moving lens barrel. The dispensing groove is used for dispensing glue to fixedly connect the axial limiting component to the mounting portion.

[0024] Optionally, in the above zoom mechanism, a bushing provided on the mounting lens barrel is further included. The bushing has a third limiting surface opposite to the first limiting surface. When the moving lens barrel abuts against the third limiting surface, the moving lens barrel is limited to the second zoom position.

[0025] Optionally, in the above zoom mechanism, the first zoom position is the wide-angle position, and the second zoom position is the magnified position.

[0026] By applying the zoom mechanism provided in the present application, the moving lens barrel is axially moved in the inner cavity of the mounting lens barrel by the traction component, so as to achieve zooming. When the second limiting surface provided on the moving lens barrel or the traction component abuts against the first limiting surface of the axial limiting component, the moving lens barrel is limited to the first zoom position. Among them, the axial limiting component is provided on the mounting portion of the mounting lens barrel and its axial position in the mounting portion is adjustable. Therefore, during the assembly process, the axial position of the first limiting surface can be adjusted by adjusting the axial position of the axial limiting component in the mounting portion, so as to realize the adjustment of the first zoom position, effectively overcome the influence of processing and assembly errors on the imaging quality, and improve the image transmission yield. In summary, the axial position of the limiting surface in the zoom mechanism is adjustable, which is convenient for image transmission debugging, beneficial to improving the yield of the image transmission component, and also helps to reduce material scrapping and save costs. In addition, the axial limiting component of the zoom mechanism is provided on the mounting portion of the mounting lens barrel, which avoids the inner cavity for mounting the moving lens barrel, and can reduce the influence on the inner cavity and its related mating structures.

[0027] To achieve the above object, the present application further provides an endoscope, which includes any one of the above zoom mechanisms. Since the above zoom mechanism has the above technical effects, the endoscope having this zoom mechanism should also have corresponding technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0029] Figure 1 It is an exploded structural schematic diagram of the zoom mechanism of a specific embodiment of the present application;

[0030] Figure 2 is Figure 1 a schematic cross-sectional structure diagram of the zoom mechanism shown in the figure, where the moving lens barrel is in the first zoom position;

[0031] Figure 3 is Figure 1 a schematic cross-sectional structure diagram of the zoom mechanism shown in the figure, where the moving lens barrel is in the second zoom position;

[0032] Figure 4 is an exploded structure diagram of the zoom mechanism according to another specific embodiment of the present application;

[0033] Figure 5 is Figure 4 a schematic cross-sectional structure diagram of the zoom mechanism shown in the figure, where the moving lens barrel is in the first zoom position.

[0034] The markings in the drawings are as follows:

[0035] mounting lens barrel 100, moving lens barrel 200, axial limiting component 300, traction component 400, bushing 500;

[0036] inner cavity 101, avoidance groove 102, dispensing groove 103, guiding through hole 104, main body part 110, mounting part 120;

[0037] lens barrel main body 210, connecting part 220;

[0038] first limiting surface 310, guiding hole 320, through hole 330, external thread 340, sliding groove 350, pin 360;

[0039] guiding column 410, second limiting surface 411, guiding column dispensing groove 412, blind hole 413, traction part 420;

[0040] third limiting surface 501, avoidance hole 502. Specific embodiments

[0041] The embodiments of the present application disclose a zoom mechanism and an endoscope to reduce the image defect caused by the zoom position deviation due to machining error and assembly error, and increase the adjustability and flexibility.

[0042] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0043] During the zooming process of the zooming mechanism, the lens barrel is moved axially in the inner cavity of the mounting lens barrel by a traction member (pushing or pulling), so as to change the axial distance between the lens on the moving lens barrel and the fixed lens, thereby achieving zooming. The fixed lens can be specifically fixed to the mounting lens barrel and / or a fixed lens barrel fixedly connected to the mounting lens barrel. The fixed lens barrel can be fixed to both ends of the mounting lens barrel, for example, that is, the moving lens barrel is located between the fixed lens barrels at both ends. A limiting surface for limiting the moving stroke of the moving lens barrel is provided in the zooming mechanism. This limiting surface is usually a bearing surface acting on the moving lens barrel during the zooming process. When the traction member pulls the moving lens barrel axially to abut against the limiting surface at one end, the moving lens barrel moves to the first zoom position. When the traction member pulls the moving lens barrel axially to abut against the limiting surface at the other end, the moving lens barrel moves to the second zoom position. Among them, one of the first zoom position and the second zoom position can be the wide-angle position, or the position for normal observation, and the other can be the magnified position. Affected by processing and assembly errors, there may be deviations in the zoom positions defined by the limiting surfaces, ultimately resulting in poor images, especially for the wide-angle position that is sensitive to optics.

[0044] In view of this, the present application provides a zooming mechanism that can adjust the axial position of the limiting surface, that is, adjust the first zoom position and / or the second zoom position, so as to reduce the position deviation caused by processing and assembly errors. In the following embodiments, the structure for adjusting the limiting surface will be mainly described.

[0045] In a specific embodiment, please refer to Figures 1 - 3, the zoom mechanism provided by the present application includes a mounting barrel 100, a moving barrel 200, an axial limiting component 300, and a traction component 400. Among them, the mounting barrel 100 has an inner cavity 101 and a mounting portion 120 arranged parallel to the axis of the inner cavity 101. The inner cavity 101 is used for slidably mounting the moving barrel 200, and the mounting portion 120 is used for mounting the axial limiting component 300. At least part of the structure of the moving barrel 200 is accommodated in the inner cavity 101 and can slide axially along the inner cavity 101. The focal length is adjusted by the movement of the moving barrel 200. The traction component 400 is fixedly connected to the moving barrel 200, thereby driving the moving barrel 200 to move axially along the inner cavity 101. The axial limiting component 300 is arranged on the mounting portion 120 and the axial mounting position of the axial limiting component 300 in the mounting portion 120 is adjustable. A first limiting surface 310 is provided on one side of the axial limiting component 300 facing the moving barrel 200. A second limiting surface 411 is provided on the moving barrel 200 or the traction component 400 opposite to the first limiting surface 310. When the traction component 400 drives the moving barrel 200 to move in the direction close to the axial limiting component 300 and the second limiting surface 411 abuts against the first limiting surface 310, the moving barrel 200 is limited to the first zoom position. It can be understood that the axial limiting component 300 can axially move in the mounting portion 120 during image transmission debugging to adjust the mounting position. After the position of the axial limiting component 300 is adjusted in place, the axial limiting component 300 can be fixedly connected to the mounting barrel 100 by conventional methods such as dispensing and self-locking structures. Correspondingly, the position of the first limiting surface 310 is fixed, and normal zooming and imaging work can be carried out.

[0046] Applying the zoom mechanism provided by the present application, the moving barrel 200 is axially moved in the inner cavity 101 of the mounting barrel 100 by the traction component 400, thereby achieving zooming. And when the second limiting surface 411 provided on the moving barrel 200 or the traction component 400 abuts against the first limiting surface 310 of the axial limiting component 300, the moving barrel 200 is limited to the first zoom position. Among them, the axial limiting component 300 is arranged on the mounting portion 120 of the mounting barrel 100 and the axial position in the mounting portion 120 is adjustable. Therefore, during the assembly process, the axial position of the first limiting surface 310 in the axial direction can be adjusted by adjusting the axial position of the axial limiting component 300 in the mounting portion 120, thereby realizing the adjustment of the first zoom position, effectively overcoming the influence of processing and assembly errors on the imaging quality, and improving the image transmission yield. In summary, the axial position of the limiting surface in this zoom mechanism is adjustable, which is convenient for image transmission debugging, beneficial to improving the yield of the image transmission component, and also helps to reduce material scrapping and save costs. In addition, the axial limiting component 300 of this zoom mechanism is arranged on the mounting portion 120 of the mounting barrel 100, which avoids the inner cavity 101 for mounting the moving barrel 200 and can reduce the influence on the inner cavity 101 and its related mating structures.

[0047] It can be understood that the first zoom position of the moving lens barrel 200 is defined by the first limiting surface 310 in this application. Therefore, the movable stroke of the moving lens barrel 200 in the mounting lens barrel 100 should be greater than the maximum moving stroke defined by the first limiting surface 310, so as to prevent the moving lens barrel 200 from being limited by the mounting lens barrel 100 and / or other structures and unable to abut against the first limiting surface 310. In addition, when the zoom structure is assembled, the axial limiting component 300 can be arranged in the middle of the adjustable stroke range of the mounting portion 120, so that the axial limiting component 300 can move forward or backward along the axis as needed during the transmission image debugging.

[0048] In the above embodiments, the axial limiting component 300 corresponding to the first zoom position is mainly described. For the second zoom position, according to needs, the same setting as above can be adopted, that is, the first axial limiting component and the second axial limiting component can be respectively arranged at both ends of the mounting lens barrel 100, and the second limiting surface that cooperates with the first limiting surface of the first axial limiting component and the fifth limiting surface 411 that cooperates with the fourth limiting surface on the second axial limiting component are provided on the moving lens barrel 200 or the traction component 400, so that the second zoom position can also be adjusted. Of course, the second zoom position can also adopt a conventional position-fixed limiting surface, which is not specifically limited here.

[0049] In some embodiments, the first limiting surface 310 and the second limiting surface 411 are arranged opposite to each other along the axis of the traction component 400. It can be understood that the axis of the traction component 400 is also the traction direction, that is, the first limiting surface 310 and the second limiting surface 411 are arranged opposite to each other along the traction direction. When the first limiting surface 310 abuts against the second limiting surface 411, the force direction formed by the two is collinear with the traction force direction formed by the traction component 400 on the moving lens barrel 200, that is, the position where the moving lens barrel 200 is subjected to the traction force is coaxial with the position where it is subjected to the limiting force. Therefore, it is not easy to form a lever, so the moving lens barrel 200 is not easy to tilt, reducing the risk of the moving lens barrel 200 shifting during the movement, not easy to jam, and the zoom process is smoother.

[0050] In some embodiments, the second limiting surface 411 is arranged on the traction component 400. By arranging the second limiting surface 411 on the traction component 400, the traction component 400 itself forms both the traction force and the sinking surface, which is not easy to form a lever effect and is more convenient for assembly.

[0051] In some embodiments, the traction member 400 includes an actuator (not shown in the figure), a traction member 420, and a guide post 410 that are connected in sequence. The guide post 410 is fixedly connected to the moving lens barrel 200, and a second limiting surface 411 is provided on one side of the guide post 410 facing the axial limiting member 300. The actuator is configured to provide a traction force to the traction member 420, so that the traction member 420 drives the guide post 410 to move, and the guide post 410 further drives the moving lens barrel 200 to move to achieve zooming. Among them, for ease of operation, the actuator can usually be arranged in the operation part of the endoscope and can be a motor, a lever, a driving circuit, etc. The specific form thereof can be set according to common traction structures. The traction member 420 can be any form of transmission member. For example, it can be a traction rope, a shape memory alloy wire, etc. In this embodiment, through the setting of the guide post 410, guiding can be achieved during the zooming process to ensure the coaxiality of the moving lens barrel 200 during the zooming process, which is beneficial to the stability of the image quality. And the guide post 410 is a rigid structure, and the second limiting surface 411 is provided on the rigid structure, which can ensure the accuracy and reliability of zooming.

[0052] In some embodiments, the axial limiting member 300 is arranged between the moving lens barrel 200 and the actuator. The traction member 420 is slidably disposed within the axial limiting member 300, and a second limiting surface 411 is provided at one end of the guide post 410 connected to the traction member 420. After the axial limiting member 300 is adjusted in place, when the traction member 420 moves backward (from the moving lens barrel 200 towards the mounting portion 120), it drives the moving lens barrel 200 to move axially backward. As the traction member 420 moves, when the second limiting surface 411 of the guide post 410 abuts against the first limiting surface 310 of the axial limiting member 300, the moving lens barrel 200 moves backward to the limit position, that is, it is limited to the first zoom position. Since the moving lens barrel 200 is usually arranged at a position relatively close to the front end, the axial distance at its rear end is longer. Therefore, arranging the axial limiting member 300 between the moving lens barrel 200 and the actuator facilitates the layout of each component and realizes the rational use of space.

[0053] In another embodiment, the axial limiting member 300 can also be arranged on the side away from the actuator. For example, a bushing 500 (serving as the mounting portion 120) is provided at one end of the mounting lens barrel 100 away from the actuator, the axial limiting member 300 is arranged in the bushing 500, and a second limiting surface 411 is provided on one side of the moving lens barrel 200 facing the bushing 500. When the moving lens barrel 200 moves to the second limiting surface 411 abuts against the first limiting surface 310 on the axial limiting member 300, the moving lens barrel 200 is limited to the first zoom position.

[0054] In some embodiments, the guiding column 410 is in axial hole fit with the moving lens barrel 200. That is, an installation through hole is provided on the moving lens barrel 200, and the guiding column 410 is fixed in the installation through hole. Specifically, a glue dispensing groove 412 is provided on the outer peripheral surface of the guiding column 410, and the glue dispensing groove 412 is used for glue dispensing to fixedly connect the guiding column 410 and the moving lens barrel 200. Specifically, when the guiding column 410 is installed, the end surface on the side away from the axial limiting component 300 does not exceed the end surface of the moving lens barrel 200, and the two can be specifically flush, so as to be matched and limited with the limiting surface on the corresponding side.

[0055] In some embodiments, a blind hole 413 is formed by axially recessing one end of the guiding column 410 connected to the traction member 420. The traction member 420 is inserted through and fixed in the blind hole 413, and the end surface of the end of the guiding column 410 connected to the traction member 420 forms a second limiting surface 411. By providing the blind hole 413 on the guiding column 410 to connect with the traction member 420 and using the end surface of the connected end as the second limiting surface 411, the structure is simple and easy to produce and assemble. Specifically, there is a gap between the inner hole of the traction member 420 and the guiding column 410. Through the setting of this gap, it is convenient to fill glue in the gap to fixedly connect the traction member 420 and the guiding column 410. It can be understood that the size of the gap should be such that the traction member 420 will not generate excessive offset, thereby reducing the impact on the smoothness of zooming. In other embodiments, the end surface of the guiding column 410 facing the traction member 420 can also be welded or bonded to the traction member 420, and a flange is provided on the guiding column 410 to form the second limiting surface 411.

[0056] In some embodiments, the axial limiting component 300 has a guiding hole 320 close to the moving lens barrel 200 and a through hole 330 connected to the guiding hole 320. The aperture of the guiding hole 320 is larger than the aperture of the through hole 330, so as to form a first limiting surface 310 at the connection between the guiding hole 320 and the through hole 330. The guiding column 410 is inserted through the guiding hole 320, and the traction member 420 extends out from the through hole 330 to be connected to the actuating member. The guiding column 410 can axially move along the guiding hole 320 under the traction of the traction member 420. By providing the guiding hole 320 in the axial limiting component 300 and making the guiding column 410 cooperate with the guiding hole 320, during the process of the traction member 420 pulling the moving lens barrel 200 to axially move to achieve zooming, the guiding column 410 is limited by the guiding hole 320, so that its axial movement is more stable and not prone to shaking, thereby ensuring the coaxiality of the moving lens barrel 200.

[0057] In some embodiments, the guide post 410 and the guide hole 320 are in clearance fit, and the clearance is not greater than the maximum allowable optical axis deviation tolerated by the optical system maintained by the zoom mechanism. By controlling the size of the clearance between the guide post 410 and the guide hole 320, the coaxiality of the moving barrel 200 during zooming is ensured. Therefore, by controlling the clearance not to be greater than the maximum allowable optical axis deviation tolerated by the optical system maintained by the zoom mechanism, the optical axis deviation generated by the movement of the guide post 410 in the guide hole 320 is within the error range allowed by the optical system. The specific value of the maximum allowable optical axis deviation tolerated by the optical system is determined according to the actual situation and is not specifically limited here. In addition, the clearance fit between the guide post 410 and the guide hole 320 also facilitates the sliding of the guide post 410 in the guide hole 320, reduces friction, and ensures smooth zooming. In addition, to reduce the friction between the guide post 410 and the guide hole 320, a smooth coating or the like can be provided on the outer surface of the guide post 410 and the inner surface of the guide hole 320 to reduce the roughness value. Similarly, the traction member 420 and the through hole 330 are in clearance fit, and the surfaces in contact with each other can also be provided with a smooth coating or the like to reduce the frictional force to ensure smooth zooming.

[0058] In other embodiments, the guide hole 320 may not be provided on the axial limiting member 300. Instead, the end face of the axial limiting member 300 facing the guide post 410 is used as the first limiting face 310. Then, when the guide post 410 moves with the traction member 420 until its end face (i.e., the second limiting face 411) abuts against the first limiting face 310, the moving barrel 200 is limited to the first zoom position. Further, the guiding of the guide post 410 can be achieved by providing a guiding through hole 104 on the mounting portion 120 and having a clearance fit with the guide post 410.

[0059] In some other embodiments, one end of the axial limiting member 300 facing the moving barrel 200 may protrude from the end face of the mounting portion 120, and the end face of the axial limiting member 300 facing the moving barrel 200 is used as the first limiting face 310. The second limiting face 411 can be provided either on the moving barrel 200 or on the traction member 400, such as on the guide post 410. Specifically, the end face of the moving barrel 200 facing the axial limiting member 300 can be used as the second limiting face 411, or a flange can be provided on the guide post 410, and the end face of the flange facing the axial limiting member 300 is used as the second limiting face 411.

[0060] In some embodiments, one end of the axial limiting member 300 away from the moving lens barrel 200 protrudes from the end face of the mounting lens barrel 100 by a preset length. The axial limiting member 300 is specifically made of a hard material. By protruding the axial limiting member 300 from the mounting lens barrel 100 by a preset length, it is ensured that the structure provided with this zoom mechanism will not bend. For example, the head end of the endoscope provided with this zoom mechanism will not bend when entering the body's image transmission part, without affecting the zoom operation. It can be understood that the preset length should meet the requirements for the total length of the hard part at the head end. In addition, one end of the axial limiting member 300 away from the moving lens barrel 200 protruding from the end face of the mounting lens barrel 100 by a preset length can also facilitate the adjustment of the axial mounting position of the axial limiting member 300 and facilitate imaging debugging.

[0061] In some embodiments, please refer to Figures 1 - 3 , the axial limiting member 300 is threadedly connected to the mounting portion 120. Specifically, the axial limiting member 300 is provided with an external thread 340, and the mounting portion 120 is provided with an internal thread. During the image transmission debugging process, the axial limiting member 300 can be rotated to make the axial limiting member 300 move axially along the mounting portion 120. The threaded fit structure is simple and easy to process, without the need for additional holes, reducing the impact on the sealing performance. And through the setting of the thread, such as using a trapezoidal thread, self-locking of the mounting portion 120 can be achieved, that is, locking at any position within the thread travel. In other embodiments, the internal thread and the external thread 340 can also be fixedly connected by applying glue. That is, by applying glue between the internal thread and the external thread 340, the fixed connection between the mounting portion 120 and the mounting portion 120 can be achieved after the mounting portion 120 is adjusted in place. It can be understood that according to the fitting relationship between the axial limiting member 300 and the mounting portion 120, such as when at least a part of the axial limiting member 300 is sleeved outside the mounting portion 120, an internal thread can also be provided on the axial limiting member 300, and an external thread 340 can be provided on the mounting portion 120.

[0062] In some other embodiments, please refer to Figures 4 - 5 , one of the axial limiting member 300 and the mounting portion 120 is provided with a sliding groove 350, and the other of the axial limiting member 300 and the mounting portion 120 is provided with a pin 360. The pin 360 is inserted into the sliding groove 350 and its fixed position in the sliding groove 350 is adjustable. The difference between this embodiment and the above embodiment is that in the above embodiment, the rotational movement of the axial limiting part is converted into axial movement by threaded connection. In this embodiment, the movement direction of the axial limiting member 300 is restricted by the cooperation of the sliding groove 350 and the pin 360. The setting positions of the sliding groove 350 and the pin 360 can be selected according to needs. Exemplarily, such as Figures 4 - 5, the slide 350 is provided in the axial limiting component 300, and the pin 360 is provided in the mounting portion 120. By limiting the slide 350, better straightness can be provided for the axial limiting component 300. In one setting method of the slide 350, the slide 350 is a linear groove arranged along the axial direction, and the fixed position of the pin 360 in the linear groove is adjustable, that is, the axial position of the pin 360 relative to the linear groove is adjustable, thereby realizing the axial position adjustment of the axial limiting component 300 relative to the mounting portion 120. Specifically, the pin 360 can slide along the linear groove and be fixed at different positions of the linear groove by gluing or thread locking. In another setting method of the slide 350, the slide 350 is a cam groove, and the rotational motion of the axial limiting component 300 is converted into its axial movement by the cooperation of the cam groove and the pin 360. During the image transmission debugging process, the axial limiting component 300 can be rotated to move axially along the mounting portion 120, thereby also adjusting the axial position of the first limiting surface 310. The cam groove converts the rotational motion of the axial limiting component 300 into its axial movement, providing high control accuracy.

[0063] In some embodiments, a glue dispensing groove 103 is defined at one end of the mounting portion 120 away from the movable lens barrel 200. This dispensing groove 103 is used to dispense glue to securely connect the axial limiting component 300 to the mounting portion 120. The provision of the dispensing groove 103 facilitates the dispensing of glue to securely connect the mounting portion 120 to the movable lens barrel 200. After image transmission debugging is completed, the axial limiting component 300 is securely connected to the mounting lens barrel 100, ensuring a stable and reliable position of the first limiting surface 310 after debugging, thereby facilitating normal zooming and imaging operations of the zoom mechanism.

[0064] Specifically, when the axial limiting component 300 is threadedly connected to the mounting portion 120, glue can be applied to the threads in advance during the image transmission debugging process. After debugging is completed, UV glue (shadowless glue) is applied to the above-mentioned glue dispensing groove 103 and cured. After curing, the glue on the internal threads is then baked at high temperature to cure. By applying glue in the glue dispensing groove 103 and pre-curing it, the accurate position of the axial limiting component 300 can be guaranteed in advance to prevent the axial limiting component 300 from shifting during the subsequent glue baking process on the threads, thereby affecting the imaging.

[0065] In some embodiments, the mounting barrel 100 includes a main body 110 and a mounting portion 120, wherein the mounting portion 120 is parallel to the main body 110, the main body 110 has an inner cavity 101, and the main body 110 is provided with a avoidance groove 102 on the side connected to the mounting portion 120, which connects the inner cavity 101 with the outside of the inner cavity 101. It is understandable that the main body 110 and the mounting portion 120 can be either an integrally formed structure or a split structure with a fixed connection or a detachable connection. While the mounting portion 120 provides a mounting position for the axial limiting component 300, the overall space occupied by the mounting barrel 100 is small, which is convenient for layout at the end of the endoscope head. For example, the mounting portion 120 can be radially protruding from the outer peripheral surface of one end of the main body 110.

[0066] In some embodiments, the mobile lens barrel 200 includes a lens barrel body 210 and a connecting portion 220. The lens barrel body 210 is slidably disposed in the inner cavity 101. One end of the connecting portion 220 is connected to the lens barrel body 210, and the other end extends out of the inner cavity 101 through the avoidance groove 102. It is understandable that the lens barrel body 210 and the connecting portion 220 can be either an integrally formed structure or a split structure that is fixedly connected or detachably connected. The lens barrel body 210 is provided with a lens, and the lens barrel body 210 can slide within the inner cavity 101. The connecting portion 220 is mainly used to cooperate with the traction component 400 to achieve traction. The traction component 400 is disposed through the mounting portion 120 and is connected to one end of the connecting portion 220 that extends out of the avoidance groove 102 to drive the mobile lens barrel 200 to move axially.

[0067] In some embodiments, there is a gap between the movable lens barrel 200 and the inner cavity 101 to avoid jamming during sliding, and the size of the gap is controlled to ensure smooth zooming while taking into account coaxiality.

[0068] In some embodiments, the zoom mechanism further comprises a bushing 500 disposed on the mounting barrel 100, the bushing 500 having a third limiting surface 501, the third limiting surface 501 being opposite to the first limiting surface 310, and when the movable barrel 200 abuts against the third limiting surface 501, the movable barrel 200 is limited to the second zoom position. In the above embodiments, the arrangement of the first limiting surface 310 corresponding to the first zoom position is mainly described. In this embodiment, the second limiting surface 411 corresponding to the second zoom position is mainly described. The third limiting surface 501 of the bushing 500 and the movable barrel 200 are mutually supported, the third limiting surface 501 being a fixed limiting surface, and the first limiting surface 310 being an adjustable limiting surface, i.e., only one end is limited and adjusted to reduce variables and reduce the difficulty of debugging the image. At the same time, the overall structure is simple and easy to operate. It is understandable that the bushing 500 can be either an independent component independent of the mounting barrel 100 or a part of the mounting barrel 100.

[0069] In some embodiments, the first zoom position is the wide-angle position and the second zoom position is the magnified position. Generally speaking, the magnified position is optically insensitive, so the limiting surface at the magnified end does not need to be adjusted. When magnifying, it is only necessary to axially move the moving lens barrel 200 through the traction member 400 until it abuts against the third limiting surface 501 of the bushing 500. When the normal mode, i.e., the wide-angle mode, is to be used, the moving lens barrel 200 is axially moved through the traction member 400 until it abuts against the first limiting surface 310. Since the optics is more sensitive in the wide-angle mode, image blurring or deviation in the field angle may occur during the debugging process. Therefore, the position requirements for the moving lens barrel 200 in the wide-angle position are relatively strict. Thus, an axially limiting member 300 with an adjustable axial position is correspondingly provided in the wide-angle position to improve the imaging quality.

[0070] In some embodiments, one end of the mounting lens barrel 100 is provided with a mounting step. The bushing 500 includes a bushing 500 main body and a protruding portion radially extending from the outer peripheral surface of the bushing 500 main body. The bushing 500 main body is sleeved outside the mounting step, and the end surface of the protruding portion is the third limiting surface 501. Further, an avoidance hole 502 is formed on the end surface of the protruding portion. The inner diameter of the avoidance hole 502 is larger than the outer diameter of the guide post 410 and smaller than the outer diameter of the connecting portion 220. Thus, even if the guide post 410 protrudes from the end surface of the moving lens barrel 200, the avoidance hole 502 can avoid it, so that the sinking surface of the connecting portion 220 abuts against the end surface of the protruding portion, i.e., the third limiting surface 501. In summary, through the setting of the avoidance hole 502, the adverse effect of the assembly error between the guide post 410 and the moving lens barrel 200 is reduced, ensuring the position accuracy of the moving lens barrel 200 in the second zoom position.

[0071] Based on the zoom mechanism provided in the above embodiments, the present application further provides an endoscope, which includes any one of the above-described zoom mechanisms. Since this endoscope adopts the zoom mechanism in the above embodiments, the beneficial effects of this endoscope can be referred to the above embodiments.

[0072] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0073] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A zoom mechanism, characterized in that: include: A mounting lens barrel (100) having an inner cavity (101) and a mounting portion (120) arranged parallel to the axis of the inner cavity (101); A movable lens barrel (200), at least part of which is accommodated in the inner cavity (101) and can slide along the axial direction of the inner cavity (101); a traction component (400) fixedly connected to the movable lens barrel (200) to drive the movable lens barrel (200) to move along the axial direction of the inner cavity (101); an axial limiting component (300) provided on the mounting portion (120) and having an adjustable axial mounting position in the mounting portion (120); a first limiting surface (310) being provided on a side of the axial limiting component (300) facing the movable lens barrel (200); The movable lens barrel (200) or the traction component (400) is provided with a second limiting surface (411) arranged opposite to the first limiting surface (310); when the traction component (400) drives the movable lens barrel (200) to move in a direction close to the axial limiting component (300) and causes the second limiting surface (411) to abut against the first limiting surface (310), the movable lens barrel (200) is limited to a first zoom position.

2. The zoom mechanism according to claim 1, wherein: The first limiting surface (310) and the second limiting surface (411) are arranged opposite to each other along the axial direction of the traction component (400).

3. The zoom mechanism according to claim 2, wherein: The second limiting surface (411) is provided on the traction component (400).

4. The zoom mechanism according to claim 3, wherein: The traction component (400) comprises an actuating member, a traction member (420), and a guide column (410) connected in sequence; the guide column (410) is fixedly connected to the movable lens barrel (200); and the guide column (410) is provided with a second limiting surface (411) on a side facing the axial limiting component (300).

5. The zoom mechanism according to claim 4, wherein: The axial limiting component (300) is arranged between the movable lens barrel (200) and the actuating component, the traction component (420) is slidably arranged in the axial limiting component (300), and the second limiting surface (411) is provided at one end of the guide column (410) connected to the traction component (420).

6. The zoom mechanism according to claim 5, wherein: One end of the guide column (410) connected to the traction member (420) is recessed along the axial direction to form a blind hole (413), the traction member (420) is passed through and fixed in the blind hole (413), and the end surface of the end of the guide column (410) connected to the traction member (420) forms the second limiting surface (411).

7. The zoom mechanism according to claim 5, wherein: The axial limiting component (300) has a guide hole (320) close to the movable lens barrel (200) and a through hole (330) connected to the guide hole (320); the aperture of the guide hole (320) is larger than the aperture of the through hole (330), so as to form the first limiting surface (310) at the connection between the guide hole (320) and the through hole (330); the guide column (410) is inserted into the guide hole (320); the traction member (420) extends from the through hole (330) to be connected to the actuating member; and the guide column (410) can move axially along the guide hole (320) under the traction of the traction member (420).

8. The zoom mechanism according to claim 7, wherein: The guide column (410) is clearance-matched with the guide hole (320), and the clearance is no greater than the maximum optical axis deviation tolerable by the optical system maintained by the zoom mechanism.

9. The zoom mechanism according to claim 5, wherein: One end of the axial limiting component (300) away from the movable lens barrel (200) protrudes from the end surface of the mounting lens barrel (100) by a preset length.

10. The zoom mechanism according to claim 1, wherein: The axial limiting component (300) is threadedly connected to the mounting portion (120); or, One of the axial limiting component (300) and the mounting portion (120) is provided with a slide groove (350), and the other of the axial limiting component (300) and the mounting portion (120) is provided with a pin (360), and the pin (360) is inserted into the slide groove (350) and its fixed position in the slide groove (350) is adjustable.

11. The zoom mechanism according to claim 10, wherein: A glue dispensing groove (103) is provided at one end of the mounting portion (120) away from the movable lens barrel (200), and the glue dispensing groove (103) is used for dispensing glue to securely connect the axial limiting component (300) to the mounting portion (120).

12. The zoom mechanism according to any one of claims 1 to 11, characterized in that: The invention also includes a bushing (500) provided on the mounting lens barrel (100), wherein the bushing (500) has a third limiting surface (501), the third limiting surface (501) being opposite to the first limiting surface (310), and when the movable lens barrel (200) abuts against the third limiting surface (501), the movable lens barrel (200) is limited to the second zoom position.

13. The zoom mechanism according to claim 12, wherein: The first zoom position is a wide-angle position, and the second zoom position is a zoom-in position.

14. An endoscope, characterized in that: Comprising the zoom mechanism as described in any one of claims 1-13.

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