Zoom mechanism and endoscope

Abstract

The utility model 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 utility model 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 location of lesions more intuitively. The magnification function can be used to observe details that cannot be observed by conventional endoscopes, such as the surface mucosal morphology. In conventional mode, doctors use low magnification to find the location of the lesion, and then use optical zoom to magnify the image, which is more conducive to diagnosing the disease. Optical magnification endoscopes mainly use a zoom mechanism to move the zoom lens in the objective optical system relative to the fixed lens along the optical axis to achieve optical zoom.

[0003] In the related art, the zoom position of a zoom mechanism with a simple structure is usually determined by a limit structure. However, in practice, the inventors of the present application found that due to the influence of processing and assembly errors, the zoom position defined by the limit structure may deviate, which ultimately results in poor image quality and a low image transmission yield of the product. Utility Model Content

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

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

[0006] A zoom mechanism, comprising:

[0007] An installation lens barrel having an inner cavity and an installation portion arranged parallel to the axis of the inner cavity;

[0008] A movable lens barrel, at least part of which is accommodated in the inner cavity and can slide along the axial direction of the inner cavity;

[0009] A traction component, fixedly connected to the movable lens barrel, to drive the movable lens barrel to move along the axial direction of the inner cavity;

[0010] An axial limiting component is provided at the mounting portion and its axial mounting position in the mounting portion is adjustable, and a first limiting surface is provided on a side of the axial limiting component facing the movable lens barrel;

[0011] The movable lens barrel or the traction component is provided with a second limiting surface arranged opposite to the first limiting surface. When the traction component drives the movable lens barrel to move in a direction close to the axial limiting component and makes the second limiting surface abut against the first limiting surface, the movable lens barrel is limited to 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 component.

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

[0014] Optionally, in the above zoom mechanism, the traction component includes an actuating member, a traction member and a guide column connected in sequence, the guide column is fixedly connected to the movable lens barrel, and the second limiting surface is provided on a side of the guide column facing the axial limiting component.

[0015] Optionally, in the above-mentioned zoom mechanism, the axial limiting component is arranged between the movable lens barrel and the actuator, the traction member can be slidably inserted into the axial limiting component, and the end of the guide column connected to the traction member is provided with the second limiting surface.

[0016] Optionally, in the above-mentioned zoom mechanism, one end of the guide column connected to the traction member is axially recessed to form a blind hole, the traction member is passed through and fixed in the blind hole, and the end surface of the end of the guide column connected to the traction member forms the second limiting surface.

[0017] Optionally, in the above-mentioned zoom mechanism, the axial limiting component has a guide hole close to the movable 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, so as to form the first limiting surface at the connection between the guide hole and the through hole, the guide column is penetrated into the guide hole, the traction member extends from the through hole to be connected to the actuator, and the guide column can move axially along the guide hole under the traction of the traction member.

[0018] Optionally, in the above zoom mechanism, the guide post and the guide hole are clearance-matched, and the clearance is no greater than the maximum optical axis deviation that can be tolerated by the optical system maintained by the zoom mechanism.

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

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

[0021] or,

[0022] One of the axial limiting component and the mounting portion is provided with a slide groove, and the other of the axial limiting component and the mounting portion is provided with a pin, the pin is inserted into the slide groove and its fixed position in the slide groove is adjustable.

[0023] Optionally, in the above-mentioned zoom mechanism, a glue dispensing groove is opened at one end of the mounting portion away from the movable lens barrel, and the glue dispensing groove is used for dispensing glue to fix the axial limiting component to the mounting portion.

[0024] Optionally, the above-mentioned zoom mechanism further includes a bushing arranged on the mounting barrel, the bushing has a third limiting surface, the third limiting surface is opposite to the first limiting surface, and when the movable barrel abuts against the third limiting surface, the movable barrel is limited to the second zoom position.

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

[0026] The zoom mechanism provided by the present application is applied, and the moving lens barrel is driven to move axially in the inner cavity of the mounting lens barrel by the traction component, so as to realize zooming, and when the second limiting surface arranged on the moving lens barrel or the traction component is against the first limiting surface of the axial limiting component, the moving lens barrel is limited to the first zoom position. Wherein, the axial limiting component is arranged on the mounting portion of the mounting lens barrel and the axial position in the mounting portion is adjustable. Therefore, during the assembly process, the position of the first limiting surface in the axial direction can be adjusted by adjusting the axial position of the axial limiting component in the mounting portion, 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 the zoom mechanism is adjustable, which is convenient for image transmission debugging, is conducive 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 arranged on the mounting portion of the mounting lens barrel, which avoids the inner cavity of the mounting moving lens barrel, and can reduce the influence on the inner cavity and its related matching structure.

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

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 This is a schematic diagram of the exploded structure of a zoom mechanism according to a specific embodiment of the present application;

[0030] Figure 2 for Figure 1 A schematic cross-sectional structure diagram of the zoom mechanism shown, wherein the movable lens barrel is located at a first zoom position;

[0031] Figure 3 for Figure 1 A schematic cross-sectional structure diagram of the zoom mechanism shown, wherein the movable lens barrel is located at a second zoom position;

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

[0033] Figure 5 for Figure 4 The cross-sectional structure diagram of the zoom mechanism shown is shown, wherein the movable lens barrel is located at the first zoom position.

[0034] The following are marked in the accompanying drawings:

[0035] Install the lens barrel 100, move the lens barrel 200, the axial limiting component 300, the pulling component 400, and the bushing 500;

[0036] Inner cavity 101, avoidance groove 102, glue dispensing groove 103, guide through hole 104, main body 110, mounting portion 120;

[0037] The lens barrel body 210, the connecting portion 220;

[0038] A first limiting surface 310, a guide hole 320, a through hole 330, an external thread 340, a sliding groove 350, and a pin 360;

[0039] Guide column 410, second limiting surface 411, guide column glue dispensing groove 412, blind hole 413, traction member 420;

[0040] The third limiting surface 501 and the avoidance hole 502 . DETAILED DESCRIPTION

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

[0042] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0043] During the zooming process, the zoom mechanism pulls (pushes or pulls) the moving lens barrel through the traction member, so that it moves axially in the inner cavity of the mounting lens barrel, so as to change the axial distance of the lens on the moving lens barrel relative to the fixed lens, thereby realizing zooming. The fixed lens can be fixedly arranged on the mounting lens barrel and / or the fixed lens barrel fixedly connected to the mounting lens barrel, and the fixed lens barrel can be fixedly arranged at both ends of the mounting lens barrel, 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 zoom mechanism, and the limiting surface is usually a sinking surface acting on the moving lens barrel during the zooming process. When the traction member pulls the moving lens barrel to move axially to abut against the limiting surface at one end, the moving lens barrel moves to the first zoom position, and when the traction member pulls the moving lens barrel to move 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 a wide-angle position, or a position called a normal observation position, and the other can be a magnified position. Affected by processing and assembly errors, the zoom position defined by the limit surface may deviate, which ultimately results in poor image quality, especially for optically sensitive wide-angle positions.

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

[0045] In a specific embodiment, see Figure 1-Figure 3The zoom mechanism provided by the present application includes a mounting barrel 100, a movable barrel 200, an axial limiting component 300 and a pulling component 400. 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 slidingly mounting the movable barrel 200, and the mounting portion 120 is used for mounting the axial limiting component 300. At least part of the structure of the movable barrel 200 is accommodated in the inner cavity 101 and can slide along the axial direction of the inner cavity 101. The focal length is adjusted by the movement of the movable barrel 200. The pulling component 400 is fixedly connected to the movable barrel 200, thereby driving the movable barrel 200 to move along the axial direction of 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, and the axial limiting component 300 is provided with a first limiting surface 310 on the side facing the movable barrel 200. The movable lens barrel 200 or the traction member 400 is provided with a second limiting surface 411 arranged opposite to the first limiting surface 310. When the traction member 400 drives the movable lens barrel 200 to move in a direction close to the axial limiting member 300 and makes the second limiting surface 411 abut against the first limiting surface 310, the movable lens barrel 200 is limited to the first zoom position. It can be understood that the axial limiting member 300 can be axially moved in the mounting portion 120 to adjust the mounting position during image transmission debugging. When the position of the axial limiting member 300 is adjusted in place, the axial limiting member 300 can be fixedly connected to the mounting lens barrel 100 by conventional methods such as dispensing glue and self-locking structure. Accordingly, the position of the first limiting surface 310 is fixed, and normal zooming and imaging work can be performed.

[0046] The zoom mechanism provided by the present application is applied, and the traction component 400 drives the movable lens barrel 200 to move axially in the inner cavity 101 of the mounting lens barrel 100, so as to realize zooming, and when the second limiting surface 411 arranged on the movable lens barrel 200 or the traction component 400 abuts against the first limiting surface 310 of the axial limiting component 300, the movable lens barrel 200 is limited to the first zoom position. Wherein, the axial limiting component 300 is arranged on the mounting portion 120 of the mounting lens barrel 100 and the axial position in the mounting portion 120 is adjustable. Therefore, in the process of assembling, the 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, 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, is conducive 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 the zoom mechanism is arranged at the mounting portion 120 of the lens barrel 100 , avoiding the inner cavity 101 where the movable lens barrel 200 is mounted, thereby reducing the impact on the inner cavity 101 and its related matching structures.

[0047] It is understandable that the present application defines the first zoom position of the movable lens barrel 200 by the first limiting surface 310, so the movable stroke of the movable lens barrel 200 in the mounting lens barrel 100 should be greater than the maximum movable stroke defined by the first limiting surface 310, so as to prevent the movable lens barrel 200 from being limited by the mounting lens barrel 100 and / or other structures and being 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 axial direction as required during the image transmission debugging.

[0048] In the above embodiment, the axial limiting component 300 corresponding to the first zoom position is mainly described. For the second zoom position, the same arrangement as above can be adopted as needed, 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 matches the first limiting surface of the first axial limiting component and the fifth limiting surface 411 that matches the fourth limiting surface on the second axial limiting component are respectively arranged on the moving lens barrel 200 or the pulling component 400, so that the second zoom position can also be adjusted. Of course, the second zoom position can also adopt a conventional fixed position 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 relatively along the axial direction of the traction member 400. It is understandable that the axial direction of the traction member 400 is also the traction direction, that is, the first limiting surface 310 and the second limiting surface 411 are arranged relatively along the traction direction. Then, when the first limiting surface 310 and the second limiting surface 411 are against each other, the force direction formed by the two is collinear with the traction force direction formed by the traction member 400 on the movable lens barrel 200, that is, the position of the traction force on the movable lens barrel 200 is coaxial with the position of the limiting force on it, so it is not easy to form a lever, so the movable lens barrel 200 is not easy to tilt, which reduces the risk of the movable lens barrel 200 being offset during movement, is not easy to get stuck, and the zooming process is smoother.

[0050] In some embodiments, the second limiting surface 411 is disposed on the traction component 400. The second limiting surface 411 is disposed on the traction component 400, and the traction component 400 itself forms both traction and a 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), 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 the side facing the axial limiting member 300. The actuator is used to provide traction to the traction member 420, so that the traction member 420 drives the guide column 410 to move, and the guide column 410 further drives the movable lens barrel 200 to move to achieve zooming. Among them, for ease of operation, the actuator can usually be arranged in the operating part of the endoscope, and can be a motor, a lever, a drive circuit, etc., and its specific form can refer to the common traction structure arrangement. The traction member 420 can be a transmission member of any form, for example, it can be a traction rope, a memory alloy wire, etc. In this embodiment, through the arrangement of the guide column 410, it can be guided during the zooming process to ensure the coaxiality of the movable lens barrel 200 during the zooming process, which is conducive to the stability of image quality. Furthermore, the guide column 410 is a rigid structure, and a second limiting surface 411 is provided on the rigid structure, so as to ensure the accuracy and reliability of zooming.

[0052] In some embodiments, the axial limiting component 300 is arranged between the mobile lens barrel 200 and the actuator, the traction member 420 is slidably arranged in the axial limiting component 300, and the end of the guide column 410 connected to the traction member 420 is provided with a second limiting surface 411. Then, after the axial limiting component 300 is adjusted in place, when the traction member 420 moves backward (from the mobile lens barrel 200 to the direction of the mounting portion 120), the mobile lens barrel 200 is driven to move axially backward. With the movement of the traction member 420, when the second limiting surface 411 of the guide column 410 and the first limiting surface 310 of the axial limiting component 300 are against each other, the mobile lens barrel 200 moves backward to the limit position, that is, is limited to the first zoom position. Since the mobile lens barrel 200 is usually arranged at a position closer to the front end, the axial distance of its rear end is longer, so the axial limiting component 300 is arranged between the mobile lens barrel 200 and the actuator, which is convenient for the layout of each component and realizes the rational use of space.

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

[0054] In some embodiments, the guide post 410 cooperates with the axial hole of the movable lens barrel 200, that is, the movable lens barrel 200 is provided with a mounting through hole, and the guide post 410 is fixedly arranged in the mounting through hole. Specifically, the outer peripheral surface of the guide post 410 is provided with a guide post glue dispensing groove 412, and the guide post glue dispensing groove 412 is used for dispensing glue to fix the guide post 410 with the movable lens barrel 200. Specifically, when the guide post 410 is installed, the end surface of the side away from the axial limiting component 300 does not exceed the end surface of the movable lens barrel 200, and the two can be flush, so as to cooperate with the limiting surface on the corresponding side to limit.

[0055] In some embodiments, 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 inserted and fixed in the blind hole 413, and the end surface of the guide column 410 connected to the traction member 420 forms a second limiting surface 411. By setting the blind hole 413 on the guide 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 guide column 410. Through the setting of the gap, it is convenient to fill glue in the gap so that the traction member 420 is fixedly connected to the guide column 410. It can be understood that the size of the gap should prevent the traction member 420 from being too offset, thereby reducing the impact on the smoothness of zooming. In other embodiments, the end surface of the guide column 410 facing the traction member 420 can also be welded or bonded to the traction member 420, and a flange is set on the guide column 410 to form the second limiting surface 411.

[0056] In some embodiments, 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 a first limiting surface 310 at the connection between the guide hole 320 and the through hole 330, the guide post 410 is inserted into the guide hole 320, the traction member 420 extends from the through hole 330 to be connected with the actuator, and the guide post 410 can move axially along the guide hole 320 under the traction of the traction member 420. By arranging the guide hole 320 in the axial limiting component 300 and making the guide post 410 cooperate with the guide hole 320, the guide post 410 can be limited by the guide hole 320 in the process of the traction member 420 pulling the movable lens barrel 200 to move axially to achieve zooming, so that the axial movement of the guide post 410 is more stable and not easy to shake, thereby ensuring the coaxiality of the movable lens barrel 200.

[0057] In some embodiments, the guide post 410 and the guide hole 320 are matched with a clearance, and the clearance is not greater than the maximum optical axis deviation that the optical system maintained by the zoom mechanism can tolerate. The clearance between the guide post 410 and the guide hole 320 is controlled to ensure the coaxiality of the moving lens barrel 200 during the zooming process, so the clearance is controlled not to be greater than the maximum optical axis deviation that the optical system maintained by the zooming mechanism can tolerate, so that the optical axis offset 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 value of the maximum optical axis deviation that the specific optical system can tolerate is determined according to actual conditions and is not specifically limited here. In addition, the clearance between the guide post 410 and the guide hole 320 is also convenient for the guide post 410 to slide in the guide hole 320, reduce friction, and ensure smooth zooming. In addition, in order to reduce the friction between the guide post 410 and the guide hole 320, a smooth coating 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 clearance-matched, and the contacting surfaces of the two can also reduce friction by providing a smooth coating, etc., to ensure smooth zooming.

[0058] In other implementations, the axial limiting component 300 may not be provided with the guide hole 320, but the end surface of the axial limiting component 300 facing the guide post 410 is used as the first limiting surface 310, and when the guide post 410 moves with the traction member 420 until its end surface (i.e., the second limiting surface 411) abuts against the first limiting surface 310, the movable lens barrel 200 is limited to the first zoom position. Further, the guide through hole 104 may be provided on the mounting portion 120, and the guide post 410 may be gap-matched to achieve the guidance of the guide post 410.

[0059] In other embodiments, one end of the axial limiting component 300 facing the movable lens barrel 200 may also protrude from the end surface of the mounting portion 120, and the end surface of the axial limiting component 300 facing the movable lens barrel 200 is used as the first limiting surface 310, and the second limiting surface 411 may be provided on the movable lens barrel 200 or on the traction component 400, such as on the guide column 410. Specifically, the end surface of the movable lens barrel 200 facing the axial limiting component 300 may be used as the second limiting surface 411, or a circle of flanges may be provided on the guide column 410, and the end surface of the flange facing the axial limiting component 300 may be used as the second limiting surface 411.

[0060] In some embodiments, the end of the axial limiting component 300 away from the movable lens barrel 200 protrudes from the end face of the mounting lens barrel 100 by a preset length. The axial limiting component 300 is specifically made of a hard material. By protruding the axial limiting component 300 relative to the mounting lens barrel 100 by a preset length, it is ensured that the structure provided with the zoom mechanism will not bend, such as the head end of the endoscope provided with the zoom mechanism entering the body and the image transmission part does not bend, and the zoom action is not affected. It is understandable that the preset length should meet the requirements for the total length of the hard part of the head end. In addition, the end of the axial limiting component 300 away from the movable lens barrel 200 protrudes from the end face of the mounting lens barrel 100 by a preset length, which can also facilitate the adjustment of the axial mounting position of the axial limiting component 300, so as to facilitate imaging debugging.

[0061] In some embodiments, see Figure 1-Figure 3 , the axial limiting component 300 is threadedly connected to the mounting portion 120. Specifically, the axial limiting component 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 component 300 can be rotated to make the axial limiting component 300 move axially along the mounting portion 120. The thread matching structure is simple and easy to process, and no additional holes are required, which reduces the impact on the sealing. And the thread setting, such as using a trapezoidal thread, can realize the self-locking of the mounting portion 120, that is, locking at any position within the thread stroke. In other embodiments, the internal thread and the external thread 340 can also be fixedly connected by glue. That is, by glueing between the internal thread and the external thread 340, the mounting portion 120 can be fixedly connected to the mounting portion 120 after the mounting portion 120 is adjusted into place. It is understandable that, according to the matching relationship between the axial limiting component 300 and the mounting portion 120, if at least a portion of the axial limiting component 300 is disposed outside the mounting portion 120, an internal thread may be provided on the axial limiting component 300 and an external thread 340 may be provided on the mounting portion 120.

[0062] In some other embodiments, see Figure 4-Figure 5 , 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, the pin 360 is inserted into the slide groove 350 and its fixed position in the slide groove 350 is adjustable. The difference between this embodiment and the above embodiment is that the above embodiment adopts a threaded connection to convert the rotational movement of the axial limiting portion into axial movement, and in this embodiment, the movement direction of the axial limiting component 300 is limited by the cooperation of the slide groove 350 and the pin 360. The setting positions of the slide groove 350 and the pin 360 can be selected as needed, for example, as Figure 4-Figure 5, the slide groove 350 is arranged on the axial limiting component 300, and the pin 360 is arranged on the mounting portion 120. By limiting the slide groove 350, better straightness can be provided for the axial limiting component 300. In one setting mode of the slide groove 350, the slide groove 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 dispensing or thread locking. In another setting mode of the slide groove 350, the slide groove 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 the axial limiting component 300 along the mounting portion 120, and the axial position adjustment of the first limiting surface 310 can also be achieved. The cam groove converts the rotational movement of the axial limiting component 300 into its axial movement, and the control accuracy is high.

[0063] In some embodiments, 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 fix the axial limiting component 300 with the mounting portion 120. The provision of the glue dispensing groove 103 facilitates dispensing glue to connect the mounting portion 120 with the movable lens barrel 200. After the image transmission debugging is completed, the axial limiting component 300 is fixedly connected to the mounting lens barrel 100, so that the position of the first limiting surface 310 after debugging is stable and reliable, which is convenient for the normal zooming and imaging work 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 the debugging is completed, UV glue (shadowless glue) is applied to the above-mentioned glue dispensing groove 103, and the UV glue is cured. After curing, the glue at the internal threads is baked at high temperature to cure. By dispensing glue in the glue dispensing groove 103 and pre-curing, the accurate position of the axial limiting component 300 can be guaranteed in advance to prevent the axial limiting component 300 from being offset during the subsequent glue baking process at the threads, thereby affecting the imaging.

[0065] In some embodiments, the mounting lens barrel 100 includes a main body 110 and a mounting portion 120, 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 that connects the inner cavity 101 with the outside of the inner cavity 101 on one side connected to the mounting portion 120. It can be understood that the main body 110 and the mounting portion 120 can be either an integrally formed structure or a split structure that is fixedly connected or detachably connected. While the mounting portion 120 provides an installation position for the axial limiting component 300, the overall space occupied by the mounting lens barrel 100 is small, which is conducive to the layout at the end of the endoscope head. Exemplarily, the mounting portion 120 can be radially protruded 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 arranged 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 can be understood that the lens barrel body 210 and the connecting portion 220 can be 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 in 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 arranged on the mounting portion 120 and connected to one end of the connecting portion 220 extending 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 arranged on the mounting lens 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 lens barrel 200 abuts against the third limiting surface 501, the movable lens barrel 200 is limited to the second zoom position. In the above embodiments, the setting of the first limiting surface 310 corresponding to the first zoom position is mainly described, and 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 is used to sink against each other with the movable lens barrel 200, the third limiting surface 501 is a fixed limiting surface, and the first limiting surface 310 is an adjustable limiting surface, that is, only one end is limited to adjust the position, so as to reduce the variable and reduce the difficulty of debugging the image. At the same time, the overall structure is simple and easy to operate. It can be understood that the bushing 500 can be an independent component independent of the mounting lens barrel 100, or it can be used as a part of the mounting lens barrel 100.

[0069] In some embodiments, the first zoom position is a wide-angle position, and the second zoom position is a magnified position. Generally speaking, the magnified position is optically insensitive, so the limit surface of the magnified end does not need to be adjusted. When zooming in, it is only necessary to axially move the movable lens barrel 200 to abut against the third limit surface 501 of the bushing 500 through the traction component 400. When it is necessary to use the normal mode, i.e., the wide-angle mode, the movable lens barrel 200 is axially moved to abut against the first limit surface 310 through the traction component 400. Since the optics are more sensitive in the wide-angle mode, the image may be blurred or the field of view may deviate during the debugging process. Therefore, the wide-angle position has stricter requirements on the position of the movable lens barrel 200, so an axial limit component 300 with an adjustable axial position is correspondingly set at 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 body and a protrusion formed by radially extending the outer peripheral surface of the bushing 500 body, the bushing 500 body is sleeved outside the mounting step, and the end surface of the protrusion is the third limiting surface 501. Further, a avoidance hole 502 is provided on the end surface of the protrusion, and the inner diameter of the avoidance hole 502 is larger than the outer diameter of the guide column 410 and smaller than the outer diameter of the connecting portion 220, so that even if the guide column 410 protrudes from the end surface of the movable lens barrel 200, the avoidance hole 502 can avoid it, so that the sinking surface of the connecting portion 220 and the end surface of the protrusion, i.e., the third limiting surface 501, sink against each other. In summary, by setting the avoidance hole 502, the adverse effects of the assembly error of the guide column 410 and the movable lens barrel 200 are reduced, and the position accuracy of the movable lens barrel 200 at the second zoom position is ensured.

[0071] Based on the zoom mechanism provided in the above embodiments, the present application further provides an endoscope, which includes any one of the zoom mechanisms in the above embodiments. Since the endoscope adopts the zoom mechanism in the above embodiments, please refer to the above embodiments for the beneficial effects of the endoscope.

[0072] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced 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 apparent to those skilled in the art, and the general principles defined herein may 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 the embodiments shown herein, but will conform to 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) is 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), which is disposed on the mounting portion (120) and has an adjustable axial mounting position in the mounting portion (120); a first limiting surface (310) is 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, characterized in that: 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, characterized in that: The second limiting surface (411) is arranged on the traction component (400).

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

5. The zoom mechanism according to claim 4, characterized in that: The axial limiting component (300) is arranged between the movable lens barrel (200) and the actuating member, the traction member (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 member (420).

6. The zoom mechanism according to claim 5, characterized in that: One end of the guide column (410) connected to the traction member (420) is axially recessed 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 one 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, characterized in that: The axial limiting component (300) comprises a guide hole (320) close to the movable lens barrel (200) and a through hole (330) connected to the guide hole (320); the diameter of the guide hole (320) is larger than the diameter 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, characterized in that: The guide column (410) and the guide hole (320) are clearance-matched, and the clearance is no greater than the maximum optical axis deviation that can be tolerated by the optical system maintained by the zoom mechanism.

9. The zoom mechanism according to claim 5, characterized in that: 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, characterized in that: 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), wherein 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, characterized in that: 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 fix 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 comprises a bushing (500) arranged on the mounting lens barrel (100), wherein the bushing (500) has a third limiting surface (501), wherein the third limiting surface (501) is 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 a second zoom position.

13. The zoom mechanism according to claim 12, characterized in that: 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 a zoom mechanism as described in any one of claims 1-13.

Images