Zoom adjusting mechanism and endoscope

Abstract

The invention relates to the technical field of medical instruments, in particular to a zoom adjusting mechanism and an endoscope. The zoom adjusting mechanism comprises a shell, a movable mirror frame, a traction assembly and an elastic reset piece. The shell comprises a first objective lens barrel and a second objective lens barrel which are detachably connected; the movable lens frame comprises a sliding part and a focusing part which are connected with each other. The sliding part is in sliding fit with the second objective lens barrel in the first direction. The traction assembly comprises a traction cable and a driving piece, one end of the traction cable penetrates through the sliding part and is connected with the driving piece, and the driving piece abuts against the sliding part so as to drive the sliding part to move in the first direction; one end of the elastic reset piece is connected with the sliding part, the other end of the elastic reset piece is connected with the second objective lens barrel so as to apply acting force in the first direction to the sliding part, and the elastic reset piece is located on the side, away from the driving piece, of the sliding part. According to the zoom adjusting mechanism and the endoscope provided by the invention, the defect that a lens cone is easy to be stuck when an existing traction zoom mechanism performs optical zoom is overcome.

Description

Technical Field

[0001] The present invention relates to the technical field of medical equipment, and in particular to a zoom adjustment mechanism and an endoscope. Background Art

[0002] At present, medical endoscopes have been widely used in the inspection, diagnosis and treatment of human cavities such as the digestive tract. Endoscopes can clearly observe the details of lesions through optical zoom technology, helping doctors to make more accurate diagnoses and greatly improving diagnostic efficiency.

[0003] However, due to the space limitation of the insertion part of the endoscope, the design of the optical zoom mechanism faces great challenges. Currently, there are two main types of common optical zoom mechanisms: cam zoom mechanism and traction zoom mechanism. The cam zoom mechanism drives the cam to rotate by rotating the motor, so that the lens barrel moves in a straight line. This design can reduce the risk of the lens barrel getting stuck during zooming, but its structure is relatively complex and requires high processing accuracy. The traction zoom mechanism drives the displacement of the lens frame by moving the traction device to achieve zooming. However, when the existing traction zoom mechanism is performing optical zoom, the lens barrel is prone to getting stuck, especially when the insertion part of the endoscope is bent, the jamming phenomenon is more serious. Summary of the invention

[0004] The invention provides a zoom adjustment mechanism and an endoscope, which are used to solve the defect that the lens barrel of the existing traction zoom mechanism is prone to jamming when performing optical zooming.

[0005] One aspect of the present invention provides a zoom adjustment mechanism, comprising: a housing, a movable lens frame, a traction assembly and an elastic reset member.

[0006] The shell includes a first objective lens barrel and a second objective lens barrel that are detachably connected; the movable lens frame includes a sliding portion and a focusing portion that are connected to each other, and the sliding portion slides with the second objective lens barrel along a first direction; the traction assembly includes a traction cable and a driving member, one end of the traction cable is passed through the sliding portion and is connected to the driving member, and the driving member abuts against the sliding portion to drive the sliding portion to move along the first direction; one end of the elastic return member is connected to the sliding portion, and the other end of the elastic return member is connected to the second objective lens barrel to apply a force along the first direction to the sliding portion, and the elastic return member is located on the side of the sliding portion away from the driving member.

[0007] According to the zoom adjustment mechanism provided by the present invention, the second objective lens barrel is provided with a sliding groove along the first direction, the sliding part and the sliding groove are slidably matched along the first direction, and the elastic return member is arranged in the sliding groove; it also includes a limiting member, one end of the limiting member is connected to the second objective lens barrel, and one end of the elastic return member is connected to the limiting member.

[0008] According to the zoom adjustment mechanism provided by the present invention, a clearance groove is provided at one end of the slide groove facing the focus adjusting portion, and the diameter of the clearance groove is larger than the diameter of the slide groove.

[0009] According to the zoom adjustment mechanism provided by the present invention, a positioning groove is formed on one side of the second objective lens barrel close to the first objective lens barrel, and the focusing part is located in the positioning groove and is coaxially arranged with the positioning groove.

[0010] According to the zoom adjustment mechanism provided by the present invention, a plurality of positioning protrusions are provided at intervals along the circumferential direction on the side of the focusing portion, and gaps are provided between some of the positioning protrusions and the inner wall of the positioning groove.

[0011] According to the zoom adjustment mechanism provided by the present invention, the side wall of the focus adjusting portion cooperates with the inner wall of the positioning groove.

[0012] According to the zoom adjustment mechanism provided by the present invention, the sliding portion is provided with a receiving groove, and at least a part of the driving member is located in the receiving groove.

[0013] According to the zoom adjustment mechanism provided by the present invention, a limiting platform for limiting the movable lens frame is provided in the second objective lens barrel, and the focusing part is located between the inner wall of the first objective lens barrel and the limiting platform.

[0014] According to the zoom adjustment mechanism provided by the present invention, a glue overflow groove is provided at the connection between the first objective lens barrel and the second objective lens barrel.

[0015] Another aspect of the present invention provides an endoscope, comprising an imaging component and a zoom adjustment mechanism as described in any one of the above items.

[0016] The zoom adjustment mechanism provided by the present invention can drive the sliding part of the movable frame to move relative to the second objective lens barrel in a first direction through the driving member when focusing by pulling the traction rope backwards, and drive the focusing part to move to achieve focusing. Since the driving member abuts against the sliding part, the driving member can be detached from the sliding part when the traction rope is pushed forward, which can effectively prevent the displacement of the traction component from exerting a lateral force on the movable frame during the zooming process or when the bending part of the endoscope is bent. The movable frame only moves forward under the force applied by the elastic reset member along the first direction, which can prevent the movable frame from being stuck during focusing, thereby ensuring the stability of imaging.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is one of the schematic diagrams of the zoom adjustment mechanism provided by the embodiment of the present invention.

[0020] Figure 2 This is the second schematic diagram of the zoom adjustment mechanism provided by the embodiment of the present invention (the first objective lens barrel is hidden).

[0021] Figure 3 It is a cross-sectional view of a zoom adjustment mechanism provided in an embodiment of the present invention.

[0022] Figure 4 yes Figure 3 A is a partial enlarged schematic diagram of the middle part.

[0023] Figure 5 yes Figure 3 A partial enlarged schematic diagram of B in the figure.

[0024] Figure 6 It is a schematic diagram of a movable lens frame in a zoom adjustment mechanism provided in an embodiment of the present invention.

[0025] Reference numerals: 100, housing; 110, first objective lens barrel; 111, glue overflow groove; 120, second objective lens barrel; 121, slide groove; 122, air avoidance groove; 123, positioning groove; 124, limit table; 200, movable frame; 210, sliding part; 211, accommodating groove; 220, focusing part; 221, positioning protrusion; 300, traction assembly; 310, traction rope; 320, driving member; 400, elastic reset member; 500, limit member. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0028] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0029] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0030] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0031] Combine the following Figures 1 to 6 The zoom adjustment mechanism and the endoscope provided by the present invention are described.

[0032] See also Figures 1 to 3 As shown, the zoom adjustment mechanism provided by the embodiment of the present invention includes: a housing 100 , a movable lens frame 200 , a traction assembly 300 and an elastic reset member 400 .

[0033] The housing 100 includes a first objective lens barrel 110 and a second objective lens barrel 120 that are detachably connected; the movable lens frame 200 includes a sliding portion 210 and a focusing portion 220 that are connected to each other, and the sliding portion 210 slidably cooperates with the second objective lens barrel 120 along a first direction; the traction assembly 300 includes a traction cable 310 and a driving member 320, one end of the traction cable 310 is passed through the sliding portion 210 and is connected to the driving member 320, and the driving member 320 abuts against the sliding portion 210 to drive the sliding portion 210 to move along the first direction; one end of the elastic return member 400 is connected to the sliding portion 210, and the other end of the elastic return member 400 is connected to the second objective lens barrel 120 to apply a force along the first direction to the sliding portion 210, and the elastic return member 400 is located on the side of the sliding portion 210 away from the driving member 320.

[0034] It should be noted that the “first direction” described in this embodiment specifically refers to Figure 3 The arrow direction shown in the figure is the length direction of the slide groove 121 described below.

[0035] Specifically, during zooming or bending the inner mirror bending portion, when the traction assembly 300 is displaced to apply lateral force to the movable frame 200, the movable frame 200 will have a certain degree of axial displacement, which aggravates the friction between certain parts of the outer wall of the movable frame 200 and the inner wall of the second objective lens barrel 120, thereby causing the movable frame 200 to become stuck when focusing.

[0036] The zoom adjustment mechanism provided by the present invention can drive the sliding portion 210 of the movable frame 200 to move relative to the second objective lens barrel 120 in a first direction via the driving member 320 when focusing by pulling the traction cable 310 backward, and drive the focusing portion 220 to move to achieve focusing. Since the driving member 320 abuts against the sliding portion 210, when the traction cable 310 is pushed forward, the driving member 320 can be detached from the sliding portion 210, which can effectively prevent the displacement of the traction assembly 300 from applying a lateral force to the movable frame 200 during the zooming process or when the bending portion of the endoscope is bent. The movable frame 200 only moves forward under the force applied by the elastic reset member 400 along the first direction, which can prevent the movable frame 200 from being stuck during focusing, thereby ensuring the stability of imaging.

[0037] See also Figures 1 to 3As shown, the housing 100 comprises a first lens barrel 110 and a second lens barrel 120 that are detachably connected. The first lens barrel 110 and the second lens barrel 120 are both used to install the optical element for imaging, and the movable lens frame 200 comprises a sliding portion 210 and a focusing portion 220 that are connected to each other, and the focusing portion 220 is also used to install the optical element for imaging. When the traction assembly 300 and the elastic reset member 400 drive the focusing portion 220 to move along the first direction, the optical element on the focusing portion 220 can move relative to the optical element on the first lens barrel 110 and the second lens barrel 120, and focusing is achieved. In addition, to prevent external impurities from entering the housing 100 and contaminating the optical element, the connection position of the first lens barrel 110 and the second lens barrel 120 is usually sealed with a sealant.

[0038] The sliding part 210 is slidably matched with the second lens barrel 120 along the first direction, which can be realized in a variety of ways as described below. For example, a sliding groove matching the sliding part 210 and extending along the first direction can be provided in the second lens barrel 120, and the sliding part 210 can slide along the first direction and drive the focus adjusting part 220 to move under the driving action of the traction cable 310 or the elastic reset member 400; a slider can also be provided on the outer wall of the sliding part 120, and a sliding groove matching the slider and extending along the first direction can be provided in the second lens barrel 120, and the slider can slide along the first direction and drive the focus adjusting part 220 to move under the driving action of the traction cable 310 or the elastic reset member 400; a slider can also be provided in the second lens barrel 120, and a sliding groove matching the slider and extending along the first direction can be provided on the outer wall of the sliding part 210, and the sliding part 210 can also slide along the first direction and drive the focus adjusting part 220 to move under the driving action of the traction cable 310 or the elastic reset member 400.

[0039] In addition to the above methods, other methods in the prior art may also be used to make the sliding portion 210 slide and cooperate with the second objective lens barrel 120 along the first direction, and the present invention does not make any specific limitation to this.

[0040] The sliding part 210 is provided with a through hole along the axial direction, and the traction assembly 300 includes a traction rope 310 and a driving member 320. One end of the traction rope 310 is passed through the through hole of the sliding part 210 and connected to the driving member 320, so that when the traction rope 310 moves forward and backward along the first direction, it can drive the driving member 320 to move synchronously. In addition, the traction rope 310 itself has a certain strength and can realize the function of pushing forward or pulling backward the driving member 320.

[0041] The elastic reset member 400 is used to apply elastic force to the sliding portion 210 of the movable frame 200, so as to drive the movable frame 200 to move along the first direction. The elastic reset member 400 can be an elastic component such as a spring or an elastic pad commonly used in the prior art.

[0042] Preferably, the elastic reset member 400 in this embodiment adopts a spring, which has a simple structure, is easy to install and arrange, can provide a precisely controllable elastic force, and can maintain good elasticity during long-term use. One end of the spring abuts against the sliding portion 210, and the other end of the spring abuts against the second objective lens barrel 120 (or other components connected to the second objective lens barrel 120, such as the stopper 500 described below). In addition, the spring can provide a clearance space for the traction cable 310, and the traction cable 310 can be sequentially passed through the through holes of the spring and the sliding portion 210 and connected to the driving member 320, thereby improving the compactness of the adjustment mechanism.

[0043] It should be noted that “one end of the elastic return member 400 is connected to the sliding portion 210, and the other end of the elastic return member 400 is connected to the second objective lens barrel 120” can specifically mean that one end of the elastic return member 400 is directly connected to the sliding portion 210, and the other end of the elastic return member 400 is directly connected to the second objective lens barrel 120, or one end of the elastic return member 400 is abutted and connected to the sliding portion 210, and the other end of the elastic return member 400 is abutted and connected to the second objective lens barrel 120.

[0044] See also Figure 3 As shown, according to some embodiments of the present invention, the second objective lens barrel 120 is provided with a slide groove 121 along the first direction, the sliding portion 210 and the slide groove 121 are slidably matched along the first direction, and the elastic return member 400 is arranged in the slide groove 121; it also includes a limit member 500, one end of the limit member 500 is connected to the second objective lens barrel 120, and one end of the elastic return member 400 is connected to the limit member 500.

[0045] By providing a slide groove 121 in the second objective lens barrel 120 and making the sliding part 210 slide and cooperate with the slide groove 121 along the first direction, and configuring one end of the limiting member 500 to be connected to the second objective lens barrel 120, it can be ensured that the movable frame 200 can move smoothly along the length direction of the slide groove 121, thereby reducing the possibility of the movable frame 200 being offset and stuck. The limiting member 500 can limit the elastic return member 400, and can not only fix one end of the elastic return member 400 through the limiting member 500 so that it can apply an elastic force to the sliding part 210, but also prevent the elastic return member 400 from slipping out of the slide groove 121.

[0046] Specifically, in order to prevent foreign matter from entering the chute 121, in this embodiment, one end of the stopper 500 is located in the chute 121 and is sealed at the connection. For example, an internal thread is provided at one end of the chute 121, and a matching external thread is provided at one end of the stopper 500. During assembly, it is only necessary to screw the end of the stopper 500 with the external thread into the internal thread end of the chute 121, or to configure one end of the stopper 500 and the chute 121 to be interference fit.

[0047] See also Figure 4 As shown, according to some embodiments of the present invention, a clearance groove 122 is provided at one end of the slide groove 121 facing the focusing portion 220 , and the diameter of the clearance groove 122 is greater than the diameter of the slide groove 121 .

[0048] See also Figure 6 As shown, due to the limitation of machining process, in the movable lens frame 200, the connection position of the sliding part 210 and the focusing part 220 ( Figure 6 There will be a rounded corner structure (at the circled position in the middle), and when the movable frame 200 moves to the extreme position, the rounded corner structure will interfere with the second objective lens barrel 120, and the focusing part 220 of the movable frame 200 cannot fit with the second objective lens barrel 120, resulting in the zoom mechanism being unable to achieve an ideal zoom effect.

[0049] The present invention provides an avoidance groove 122 whose diameter is larger than that of the slide groove 121 at one end of the slide groove 121 facing the focusing part 220. The avoidance groove 122 can make way for the rounded corner structure at the connection position between the sliding part 210 and the focusing part 220 in the movable frame 200, thereby preventing the second objective lens barrel 120 from interfering with the rounded corner position of the movable frame 200, so that the movable frame 200 can be moved to the set position as required to achieve an ideal magnification effect.

[0050] See also Figure 2 and Figure 3 As shown, according to some embodiments of the present invention, a positioning groove 123 is formed on one side of the second objective lens barrel 120 close to the first objective lens barrel 110 , and the focusing unit 220 is located in the positioning groove 123 and is coaxially arranged with the positioning groove 123 .

[0051] Specifically, since the sliding part 210 may rotate axially when moving in the slide groove 121, the optical element on the focusing part 220 may deviate from the set optical path, resulting in a decrease in imaging accuracy. The present invention provides a positioning groove 123 on a side of the second objective lens barrel 120 close to the first objective lens barrel 110, and the focusing part 220 is arranged in the positioning groove 123 and coaxially with the positioning groove 123, and the positioning groove 123 can be used to limit the focusing part 220, so that the optical element on the focusing part 220 is always on the set optical path, thereby improving imaging accuracy.

[0052] See also Figure 2 As shown, according to some embodiments of the present invention, a plurality of positioning protrusions 221 are provided at intervals along the circumferential direction on the side of the focusing portion 220 , and gaps are provided between some of the positioning protrusions 221 and the inner wall of the positioning groove 123 .

[0053] By arranging a plurality of positioning protrusions 221 at intervals along the circumferential direction on the side of the focusing portion 220 and setting gaps between some of the positioning protrusions 221 and the inner wall of the positioning groove 123, it is possible to avoid a jamming phenomenon caused by friction between the side wall of the focusing portion 220 and the inner wall of the positioning groove 123 due to external forces, while ensuring that the optical elements on the focusing portion 220 are always in the set optical path.

[0054] As an example, three positioning protrusions 221 are provided on the side of the focusing portion 220 in this embodiment at intervals along the circumferential direction, and the side walls of the positioning protrusions 221 are set to an arc shape that matches the inner wall of the positioning groove 123, two of which cooperate with the inner wall of the positioning groove 123, and a gap is provided between the other positioning protrusion 221 and the inner wall of the positioning groove 123.

[0055] According to some embodiments of the present invention, the side wall of the focusing portion 220 matches the inner wall of the positioning groove 123 .

[0056] By configuring the side wall of the focusing part 220 to cooperate with the inner wall of the positioning groove 123, the optical element on the focusing part 220 can be always confined to the set optical path by utilizing the cooperation between the side wall of the focusing part 220 and the inner wall of the positioning groove 123, thereby improving the imaging effect.

[0057] See also Figure 3 As shown, according to some embodiments of the present invention, the sliding portion 210 is provided with a receiving groove 211 , and at least a portion of the driving member 320 is located in the receiving groove 211 .

[0058] By providing the receiving groove 211 on the sliding portion 210 , the receiving groove 211 can be used to receive and guide at least a portion of the driving member 320 , thereby improving the stability of the traction rope 310 during traction and effectively reducing the axial space occupied by the driving member 320 .

[0059] Preferably, in this embodiment, the depth of the receiving groove 211 is greater than or equal to the length of the driving member 320. When the traction cable 310 is pulled, the driving member 320 can be completely located in the receiving groove 211, so that the driving member 320 does not occupy any axial space, thereby improving the compactness of the zoom adjustment mechanism. At the same time, when the focusing part 220 is located at the extreme position of the front end, the movable frame 200 can be attached to the inner wall of the first eyepiece barrel, thereby improving the stability of the zoom adjustment mechanism.

[0060] See also Figure 3 As shown, according to some embodiments of the present invention, a limiting platform 124 for limiting the movable lens frame 200 is provided in the second objective lens barrel 120 , and the focusing unit 220 is located between the inner wall of the first objective lens barrel 110 and the limiting platform 124 .

[0061] By providing the limiting platform 124 in the second objective lens barrel 120 , the inner wall of the first objective lens barrel 110 and the limiting platform 124 can be used to limit the focus adjusting unit 220 , thereby preventing the focus adjusting unit 220 from moving beyond a limit position.

[0062] Specifically, when the focusing part 220 is located at the front limit position, one end surface of the focusing part 220 cooperates with the inner wall of the first objective lens barrel 110 , and when the focusing part 220 is located at the rear limit position, the other end surface of the focusing part 220 cooperates with the limit platform 124 .

[0063] See also Figure 5 As shown, according to some embodiments of the present invention, a glue overflow groove 111 is provided at the connection between the first objective lens barrel 110 and the second objective lens barrel 120 .

[0064] By providing the overflowing glue groove 111 at the connection between the first objective lens barrel 110 and the second objective lens barrel 120, the glue is prevented from overflowing into the housing 100 during the gluing process, thereby preventing the internal components from being contaminated. During the gluing process, the sealant will flow into the overflowing glue groove 111 through the connection gap, ensuring that the glue will not flow further into the housing 100, thereby effectively protecting the internal components.

[0065] The endoscope provided by the present invention is described below. The endoscope described below and the zoom adjustment mechanism described above can be referenced to each other.

[0066] The endoscope provided in the embodiment of the present invention comprises an imaging assembly 600 and a zoom adjustment mechanism as described in any one of the above embodiments.

[0067] The endoscope provided by the present invention adopts the zoom adjustment mechanism described in any of the above embodiments, and therefore, it is also possible to prevent the movable frame 200 from being stuck during focusing, thereby ensuring the stability of imaging.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A zoom adjustment mechanism, characterized in that: include: A housing, the housing comprising a first objective lens barrel and a second objective lens barrel that are detachably connected; A movable lens frame, wherein the movable lens frame comprises a sliding portion and a focusing portion connected to each other, and the sliding portion is slidably matched with the second objective lens barrel along a first direction; A traction assembly, the traction assembly comprising a traction rope and a driving member, one end of the traction rope is passed through the sliding part and connected to the driving member, and the driving member abuts against the sliding part to drive the sliding part to move along the first direction; An elastic return member, one end of which is connected to the sliding portion, and the other end of which is connected to the second objective lens barrel to apply a force along the first direction to the sliding portion, and the elastic return member is located on a side of the sliding portion away from the driving member.

2. The zoom adjustment mechanism according to claim 1, characterized in that: The second objective lens barrel is provided with a slide groove along the first direction, the sliding portion is slidably matched with the slide groove along the first direction, and the elastic reset member is arranged in the slide groove; It also includes a limiting member, one end of which is connected to the second objective lens barrel, and one end of the elastic reset member is connected to the limiting member.

3. The zoom adjustment mechanism according to claim 2, characterized in that: An air avoidance groove is provided at one end of the slide groove facing the focusing portion, and the diameter of the air avoidance groove is larger than the diameter of the slide groove.

4. The zoom adjustment mechanism according to claim 1, characterized in that: A positioning groove is formed on one side of the second objective lens barrel close to the first objective lens barrel, and the focusing part is located in the positioning groove and is coaxially arranged with the positioning groove.

5. The zoom adjustment mechanism according to claim 4, characterized in that: A plurality of positioning protrusions are arranged at intervals along the circumferential direction on the side of the focusing portion, and gaps are arranged between some of the positioning protrusions and the inner wall of the positioning groove.

6. The zoom adjustment mechanism according to claim 4, characterized in that: The side wall of the focusing portion matches the inner wall of the positioning groove.

7. The zoom adjustment mechanism according to any one of claims 1 to 6, characterized in that: The sliding portion is provided with a receiving groove, and at least a portion of the driving member is located in the receiving groove.

8. The zoom adjustment mechanism according to any one of claims 1 to 6, characterized in that: A limiting platform for limiting the position of the movable lens frame is provided in the second objective lens barrel, and the focusing part is located between the inner wall of the first objective lens barrel and the limiting platform.

9. The zoom adjustment mechanism according to any one of claims 1 to 6, characterized in that: A glue overflow groove is provided at the connection between the first objective lens tube and the second objective lens tube.

10. An endoscope, characterized in that: It comprises an imaging component and a zoom adjustment mechanism as described in any one of claims 1 to 9.

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