Front end assembly and endoscope

Abstract

The application relates to the technical field of endoscopes, in particular to a front-end assembly and an endoscope, which comprises a curved tube, a fixed base plate and a light-transmitting cover, the distal end of the curved tube is provided with an assembly cavity, the fixed base plate is arranged in the assembly cavity, the fixed base plate is provided with a support and a camera module, the support is provided with a light source, and the light-transmiting cover is arranged at the opening of the assembly cavity. The application shortens the axial distance between the light source and the camera module by using the support, reduces the interference of the inner wall of the curved tube and the circumferential wall of the camera module on the light-emitting range, improves the light-emitting effect, and in the process of installing the light-transmitting cover, the first abutting surface is matched with the image acquisition surface of the camera module, and the second abutting surface is matched with the light-emitting surface of the light source, so that the light-emitting direction of the light source corresponds to the image acquisition direction of the camera module. The light-emitting effect of the light source after assembly is consistent with the designed light-emitting effect, the assembly process and the assembly difficulty of the front-end assembly of the endoscope are simplified, the assembly efficiency and the assembly convenience are improved, and the production cost of the endoscope is reduced.

Description

Technical Field

[0001] This invention relates to the field of endoscopy technology, and more particularly to a front-end component and an endoscope. Background Technology

[0002] An endoscope is a medical device widely used in departments such as gastroenterology, respiratory medicine, otolaryngology, and urology. Through the synergistic effect of distal imaging, flexible bending section, insertion tube reaching deep into the body, and control function of the operating section, it enables visual observation and minimally invasive treatment of internal tissues.

[0003] In the process of realizing this invention, the applicant discovered that high assembly precision is required when assembling the distal imaging component. Summary of the Invention

[0004] The purpose of this application is to provide a front-end component and an endoscope to solve the aforementioned technical problems existing in the prior art.

[0005] This application is implemented as follows:

[0006] In a first aspect, this application provides a front-end component for use in an endoscope, comprising:

[0007] A curved tube, wherein the distal end of the curved tube is provided with an assembly cavity, and the distal end of the assembly cavity is provided with an opening;

[0008] A fixed substrate is disposed in the assembly cavity. A support member and a camera module are disposed on the fixed substrate. A mounting surface is disposed on the support member, and a light source is disposed on the mounting surface. Along the axial direction of the curved tube, the light-emitting surface of the light source is located near the image acquisition surface of the camera module.

[0009] A light-transmitting cover is provided at the opening. The light-transmitting cover includes a groove and a boss located on the inner side. A first abutting surface is provided in the groove, which abuts and fits against the image acquisition surface of the camera module. A second abutting surface is provided on the boss, which abuts and fits against the light-emitting surface of the light source.

[0010] Secondly, this application provides an endoscope including a handle and the aforementioned front end assembly, wherein the proximal end of the curved tube is connected to the distal end of the handle.

[0011] The technical solution provided in this application can achieve the following beneficial effects:

[0012] This application utilizes a support component to shorten the axial distance between the light source and the camera module, reducing interference between the inner wall of the curved tube and the peripheral wall of the camera module on the light emission range and improving the light emission effect. Simultaneously, during the installation of the light-transmitting cover, the first abutting surface abuts against the image acquisition surface of the camera module, and the second abutting surface abuts against the light emission surface of the light source, correcting the position of the fixed substrate inside the curved tube and ensuring that the illumination direction of the light source corresponds to the image acquisition direction of the camera module. This not only ensures that the light emission effect of the light source after assembly is consistent with the designed light emission effect, but also simplifies the assembly process and assembly difficulty of the endoscope front-end components, improves assembly efficiency and ease of assembly, and reduces the production cost of the endoscope. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the endoscope in this application;

[0015] Figure 2 This is a schematic diagram of the structure of the front-end component of this application;

[0016] Figure 3 This is an exploded view of the front-end components of this application;

[0017] Figure 4 This is a schematic diagram of the internal structure of the front-end component of this application;

[0018] Figure 5 This is a schematic diagram of the connection structure of the fixed substrate, light source and camera nozzle in this application;

[0019] Figure 6 This is a schematic diagram of the structure of the light-transmitting cover of this application;

[0020] Figure 7 This is a schematic diagram of the connection structure between the fixed substrate and the light source in this application;

[0021] Figure 8 This is a schematic diagram of the internal structure of the front-end component from another perspective.

[0022] In the picture:

[0023] 10. Bending tube; 110. Assembly cavity; 120. Fixed base plate; 130. Support member; 131. Positioning stage; 132. Snap-fit ​​part; 133. Flexible section; 140. Light source; 141. Light-emitting surface; 150. Camera module; 151. Image acquisition surface; 160. Light-transmitting cover; 161. First abutment surface; 162. Second abutment surface; 163. Transition surface; 1631. Straight section; 1632. Curved section; 20. Handle. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0025] In the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0026] In various embodiments of this application, "proximal end" and "distal end" refer to the position of the endoscope and its accessories relative to the user in the usage environment. The end closer to the user is designated as the "proximal end", and the end farther from the user is designated as the "distal end".

[0027] An endoscope has a camera module and light sources symmetrically positioned on either side of it at its distal end. The light sources provide illumination, which is reflected off the inner wall of the body cavity and onto the camera module, enabling it to image the environment inside the cavity. The illumination provided by the light source has a significant impact on the image quality of the camera module. However, in the current endoscope assembly process, the camera module and light source are typically mounted on the same substrate before being inserted into the distal end of a curved tube. On the one hand, due to the limited space inside the distal end of the curved tube and the small assembly gap between the substrate and the curved tube, it is difficult to accurately insert the substrate into the curved tube and to determine whether the substrate is properly installed. On the other hand, the axial dimension of the light source is smaller than that of the camera module, causing the light emission range of the light source to be blocked by the inner wall of the curved tube and the peripheral wall of the camera module after assembly. This is especially true when the substrate is tilted inside the curved tube, which exacerbates the interference of the inner wall of the curved tube and the peripheral wall of the camera module on the light emission range, resulting in a lower light emission effect than designed.

[0028] To address this, this application provides a front-end component and an endoscope. By utilizing a support member to shorten the axial distance between the light source and the camera module, interference from the inner wall of the curved tube and the peripheral wall of the camera module on the light emission range is reduced. Furthermore, after the fixed substrate is installed inside the curved tube, precise assembly of the fixed substrate's position is unnecessary. During the installation of the light-transmitting cover, the first contact surface abuts against the image acquisition surface of the camera module, and the second contact surface abuts against the light emission surface of the light source. This corrects the position of the fixed substrate within the curved tube, ensuring that the illumination direction of the light source corresponds to the image acquisition direction of the camera module. This guarantees that the light emission effect of the light source after assembly is consistent with the designed light emission effect, simplifies the assembly process and difficulty of the endoscope's front-end component, improves assembly efficiency and convenience, and reduces the production cost of the endoscope. Specific embodiments are described below.

[0029] This embodiment provides a front-end component for use in an endoscope, such as... Figures 1-6 As shown, it includes:

[0030] The bending tube 10 is used to cooperate with the lever on the handle 20 to achieve directional bending of the front end component, so as to smoothly insert it into the body cavity. The structure for positioning and bending of the bending tube 10 is prior art. For example, the lever can be set to be connected to the active bending section of the bending tube 10 through a traction rope. The lever pulls the traction rope to drive the active bending section to achieve directional bending of the front end component. The specific structure for achieving directional bending of the front end component is not the point of this application and will not be described in detail here. The distal end of the bending tube 10 is provided with an assembly cavity 110. The assembly cavity 110 can be set on the peripheral wall of the distal end of the bending tube 10, or it can be set on the distal end face of the bending tube 10. In this embodiment, it is preferred to set the assembly cavity 110 on the distal end face of the bending tube 10. The distal end of the assembly cavity 110 is provided with an opening, which is at least able to allow the fixed base plate 120 to pass through, so that the fixed base plate 120 can be inserted into the assembly cavity 110 through the opening.

[0031] A fixed substrate 120 is provided, which can be a PCB board, a PCBA board, or a flexible circuit board; in this embodiment, a PCB board is preferred. The fixed substrate 120 is disposed within the assembly cavity 110. A support member 130 and a camera module 150 are provided on the fixed substrate 120. The support member 130 has a mounting surface, on which a light source 140 is provided. Along the axial direction of the curved tube 10, the light-emitting surface 141 of the light source 140 is located near the image acquisition surface 151 of the camera module 150, that is, the image acquisition surface 151 of the camera module 150 is located between the light-emitting surface 141 of the light source 140 and the distal surface of the curved tube 10. The light source 140 can be an LED or a light-guiding fiber; in this embodiment, an LED is preferred. The camera module 150 is used to acquire image information along the axial direction of the distal end of the curved tube, so as to obtain the endoscopic field of view at the distal end of the curved tube to observe the internal condition of the human body cavity.

[0032] A light-transmitting cover 160 is provided at the opening. The light-transmitting cover 160 includes a groove and a boss located on the inner side. A first abutting surface 161 is provided in the groove. The first abutting surface abuts and fits against the image acquisition surface 151 of the camera module 150 so that the first abutting surface 161 and the image acquisition surface 151 of the camera module 150 are attached to the same plane. A second abutting surface 162 is provided on the boss. The second abutting surface 162 abuts and fits against the light emitting surface 141 of the light source 140 so that the second abutting surface 162 and the light emitting surface 141 of the light source 140 are attached to the same plane.

[0033] During the assembly of the front-end components, the light source 140 is first installed onto the mounting surface of the support 130, and the camera module 150 is installed onto the fixed substrate 120. The support 130 is used to shorten the axial distance between the light-emitting surface 141 of the light source 140 and the image acquisition surface 151 of the camera module 150, reducing the interference of the inner wall of the bent tube 10 and the peripheral wall of the camera module 150 on the light-emitting range and improving the illumination effect of the light source 140. Then, the fixed substrate 120 is inserted into the assembly cavity 110 through the opening. The entire assembly is pushed into the assembly cavity 110, and then the light-transmitting cover 160 is installed, aligning the first abutment surface 161 with the image acquisition surface 151 of the camera module 150 and the second abutment surface 162 with the light-emitting surface 141 of the light source 140. Then, the light-transmitting cover 160 is pushed into the assembly cavity 110 along the axial direction of the curved tube 10. During this process, if the fixed substrate 120 is tilted within the assembly cavity 110, causing the camera module 150 and the light source 140 to deviate from the axis of the curved tube 10, the light-transmitting cover 160 will facilitate... The light source 140 abuts against the second abutment surface 162, or the camera module 150 abuts against the first abutment surface 161, causing the fixed substrate 120 to move axially within the assembly cavity 110 and deflect. This deflection ensures that the light source 140 and the second abutment surface 162 are in contact, while the camera module 150 and the first abutment surface 161 are also in contact. This achieves the correction and adjustment of the fixed substrate 120's installation position within the assembly cavity 110, eliminating the need for additional adjustments by operators. The precise assembly of the mounting plate 120 effectively simplifies the assembly process and difficulty of the endoscope front-end components, improves assembly efficiency and convenience, and reduces the production cost of the endoscope. At the same time, the abutment and bonding of the light source 140 with the second abutment surface 162 and the abutment and bonding of the camera module 150 with the first abutment surface 161 effectively ensures that the light output effect of the light source 140 after assembly is consistent with the designed light output effect. Meanwhile, the camera module 150 and the light source 140 can also maintain the design synergy effect to ensure the stability of the front-end component assembly quality.

[0034] In some embodiments, to further reduce the assembly difficulty of the light source 140, such as Figure 7 and Figure 8 As shown, a positioning platform 131 can be provided on the mounting surface. The positioning platform 131 cooperates with the mounting surface to achieve the installation and positioning of the light source 140. When the light source 140 is installed on the support member 130, the light source 140 is fixed to the mounting surface against the positioning platform 131. The peripheral wall of the positioning platform 131 is used to position and constrain the light source 140, which can improve the accuracy of the installation position of the light source 140, limit the displacement of the light source 140 during the installation process, and protect the light source 140 to prevent it from falling off the support member 130 after being fixed.

[0035] To further reduce the assembly difficulty of the front-end components, the positioning platform 131 can be configured as a flexible structure. The positioning platform 131 engages with the inner wall of the boss to fix the support member 130 to the light-transmitting cover 160. Along the axial direction of the curved tube 10, the distal end of the positioning platform 131 is located between the light-emitting surface 141 of the light source 140 and the image-acquiring surface 151 of the camera module 150. After the light source 140 and the camera module 150 are mounted on the fixing substrate 120, the light-transmitting cover 160 and the fixing substrate 120 can be pre-fixed. Specifically, the first abutment surface 161 corresponds to the image-acquiring surface 151 of the camera module 150, and the second abutment surface 162 corresponds to the light-emitting surface 141 of the light source 140. The positioning platform 131 is inserted into the inner side of the boss, and the two positioning platforms 131 abut against the inner walls of the adjacent bosses respectively. The light can be transmitted through the support member 130. The cover 160 is pre-fixed on the fixed base plate 120. Then, the fixed base plate 120 and the light-transmitting cover 160 are installed into the assembly cavity 110. The light-transmitting cover 160 and the fixed base plate 120 are pushed into the assembly cavity 110 along the axial direction of the bent tube 10 and pushed into place, so that the light source 140 abuts and adheres to the second abutting surface 162, and the camera module 150 abuts and adheres to the first abutting surface 161. Then, the light-transmitting cover 160 and the opening are glued and fixed to complete the assembly of the front-end components. In some embodiments, the fixed substrate 120, which is equipped with a light source 140 and a camera module 150, can be first installed into the assembly cavity 110. Then, the light-transmitting cover 160 is controlled so that the positioning stage 131 is inserted into the inner side of the boss. The two positioning stages 131 respectively abut against the inner wall of the adjacent boss. The light-transmitting cover 160 is pre-fixed on the fixed substrate 120 by the support member 130. Then, the light-transmitting cover 160 is pushed along the axial direction of the bent tube 10 to push the light-transmitting cover 160 and the fixed substrate 120 into the assembly cavity 110 and into place, so that the light source 140 abuts against the second abutting surface 162 and the camera module 150 abuts against the first abutting surface 161. Then, the light-transmitting cover 160 and the opening are glued and fixed to complete the assembly of the front end component.

[0036] In some implementations, to achieve pre-fixation between the positioning stage 131 and the light-transmitting cover 160, such as Figure 6As shown, a transition surface 163 can be provided on the light-transmitting cover 160. The transition surface 163 is used to achieve a smooth transition between the first abutment surface 161 and the second abutment surface 162. The cross-section of the transition surface 163 includes a straight segment 1631 and an arc segment 1632. The straight segment 1631 is closer to the second abutment surface 162, and the arc segment 1632 is closer to the first abutment surface 161. The straight segment 1631 ensures stable abutment with the positioning stage 131. When the fixed substrate 120 is tilted in the assembly cavity 110, the arc segment 1632 enhances the abutment force on the positioning stage 131, assisting the fixed substrate 120 in quickly correcting its position in the assembly cavity 110.

[0037] In some embodiments, to ensure the structural stability of the light source 140 and the camera module 150 on the fixed substrate 120, a snap-fit ​​portion 132 may be provided on the support member 130. The snap-fit ​​portion 132 cooperates with the peripheral wall of the camera module 150 to fix the camera module 150. The snap-fit ​​portion 132 provides radial support to the camera module 150, thereby improving the structural stability of the light source 140 and the camera module 150 on the fixed substrate 120.

[0038] In some embodiments, due to the influence of processing precision, the connection between the light source 140 and the support member 130, and the connection between the support member 130 and the fixed substrate 120 may have processing errors, causing the light emission direction of the light source 140 to deviate from the axial direction of the fixed substrate 120, resulting in a deterioration in the light emission effect. To reduce the problem of deterioration in the light emission effect caused by processing errors, the support member 130 may be provided to include a flexible section 133. The snap-fit ​​portion 132 is connected to the fixed substrate 120 through the flexible section 133. The flexible section 133 has a deformation space in the assembly cavity 110 along the radial direction of the bent tube 10, so as to realize the abutment and fit between the camera module 150 and the first abutment surface 161, and the abutment and fit between the light source 140 and the second abutment surface 162; the second abutment surface 162 is located at the distal end of the snap-fit ​​portion 132. During the assembly of the front-end components, the fixed substrate 120 is tilted within the assembly cavity 110. When the light-transmitting cover 160 is installed, the second abutting surface 162 of the light-transmitting cover 160 and the light-emitting surface 141 of the light source 140 are in point-to-surface or line-to-surface contact. The second abutting surface 162 applies a pushing force to the light-emitting surface 141, pushing the fixed substrate 120 to the installation position. Then, the pushing force is transmitted to the flexible section 133, causing the flexible section 133 to bend and deform, so that the second abutting surface 162 and the light-emitting surface 141 become surface-to-surface contact, correcting the light emission direction of the light source 140 to be consistent with the axial direction of the fixed substrate 120 and the axial direction of the bent tube 10, thereby improving the light emission effect of the light source 140.

[0039] In some embodiments, a base is provided in the assembly cavity 110. The base is used to mount the fixed substrate 120. When the fixed substrate 120 moves axially along the curved tube 10, the base limits the axial movement of the fixed substrate 120 to ensure that the light-transmitting cover 160 can push the fixed substrate 120 into place. During the assembly of the front-end components, when the fixed substrate 120 is corrected by pushing it in with the light-transmitting cover 160, the light-transmitting cover 160 will first push the fixed substrate 120 to abut against the base, so that the fixed substrate 120 and the base make surface contact. When the support member 130 includes a flexible section 133, the light-transmitting cover 160 will continue to push forward to cause the flexible section 133 to undergo adaptive bending deformation, so as to correct the light-emitting surface 141 of the light source 140 and improve the light emission effect of the light source 140.

[0040] In some embodiments, to ensure the axial consistency of the light source 140 and the camera module 150 during assembly, the locking part 132 and the peripheral wall of the camera module 150 can be provided to have a sliding stroke along the axial direction of the curved tube 10. When correcting the light-emitting surface 141 of the light source 140, the sliding fit between the locking part 132 and the peripheral wall of the camera module 150 is used to avoid relative displacement between the light source 140 and the camera module 150 in the radial direction. At the same time, it improves the structural strength of the support member 130 corresponding to the locking part 132, allowing stress to concentrate on the flexible section 133, making the flexible section 133 easy to undergo adaptive bending deformation, so as to complete the correction of the light-emitting surface 141 of the light source 140 and improve the structural stability and safety between the light source 140 and the support member 130. Preferably, the flexible section 133 can be configured as an arc-shaped structure. The latching part 132 can be configured as a semi-closed latching groove, in which the camera module 150 passes. The inner wall of the semi-closed latching groove slides in conjunction with the peripheral wall of the camera module 150.

[0041] In some embodiments, the first contact surface 161 and the second contact surface 162 can be set to be parallel. After the light-transmitting cover 160 pushes the fixed substrate 120 into place, the light-emitting surface 141 of the light source 140 and the image acquisition surface 151 of the camera module 150 can be made parallel, ensuring that the illumination direction of the light source 140 and the image acquisition direction of the camera module 150 are consistent, thereby improving the lighting effect and image acquisition quality.

[0042] In some embodiments, a preset gap may be provided between the light source 140 and the camera module 150 to reduce interference between the light source 140 and the camera module 150, while providing a mating space for the positioning stage 131 and the inner wall of the boss.

[0043] In some embodiments, to facilitate the adhesive bonding and fixing of the light-transmitting cover 160 and the opening of the assembly cavity 110, a stepped surface may be provided at the opening. The light-transmitting cover 160 includes a third abutting surface located on the inner side, the third abutting surface being located on the outer side of the boss, and the third abutting surface abutting and engaging with the stepped surface. Specifically, the axial length of the support 130 is greater than the axial distance between the step surface and the base. Thus, during the assembly process, before the third abutment surface contacts the step surface, the second abutment surface 162 has already abutted against the light-emitting surface 141 of the light source 140. As the light-transmitting cover 160 moves axially closer to the step surface, the second abutment surface 162 generates a thrust on the light-emitting surface 141 of the light source 140 and transmits it to the flexible section 133. This causes the flexible section 133 to undergo adaptive bending deformation during the pushing process of the light-transmitting cover 160. This not only promotes the correction of the mounting posture of the fixed substrate 120, but also ensures that the light-emitting surface 141 of the light source 140 and the second abutment surface 162 are stably attached. Finally, the light-transmitting cover 160 is pushed so that the first abutment surface 161 and the image acquisition surface 151 are attached, improving the lighting effect and image acquisition effect. Then, the light-transmitting cover 160 and the opening can be glued and cured to fix the relative positions of the fixed substrate 120, light source 140, camera module 150 and light-transmitting cover 160 in the fixed assembly cavity 110, so as to ensure the structural stability and safety of the front-end components.

[0044] In some embodiments, a limiting member is provided at the opening of the assembly cavity 110. When the light-transmitting cover 160 is pushed into the mounting base plate and installed in place within the assembly cavity 110, the limiting member axially limits the light-transmitting cover 160 to prevent displacement of the light-transmitting cover 160 within the assembly cavity 110, which would cause changes in the axial positions of the mounting base plate 120, the light source 140, the support member 130, and the camera module 150. Specifically, the limiting member is a positioning groove, and the peripheral wall of the light-transmitting cover 160 is provided with a positioning protrusion that matches the positioning groove; alternatively, the limiting member can be set as a positioning protrusion, and a positioning groove matching the positioning protrusion can be provided on the peripheral wall of the light-transmitting cover 160. Through the cooperation of the positioning protrusion and the positioning groove, the light-transmitting cover 160 is fixed within the assembly cavity 110.

[0045] This embodiment provides an endoscope, such as Figure 1 As shown, the device includes a handle 20 and the front end assembly in the above embodiment, with the proximal end of the curved tube 10 connected to the distal end of the handle 20.

[0046] The endoscope provided in this application embodiment can be a bronchoscope, or a nephroscope, esophagoscope, gastroscope, colonoscope, otoscope, rhinoscope, oral endoscope, laryngoscope, colposcope, laparoscope, arthroscope, etc. This application embodiment does not specifically limit the type of endoscope.

[0047] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0048] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A front end assembly for an endoscope, comprising: The application relates to a front-end assembly of a camera module. The front-end assembly comprises a curved pipe, a fixing base plate, a light-transmitting cover and a handle. The curved pipe is provided with an assembling cavity at a distal end, and the assembling cavity is provided with an opening at a distal end. The fixing base plate is arranged in the assembling cavity, and is provided with a support and a camera module.

2. A front end module according to claim 1, characterized in that The support is provided with a mounting surface, and the mounting surface is provided with a light source.

3. A front end module according to claim 2, characterized in that The light source is located at a proximal end of an image acquisition surface of the camera module along an axial direction of the curved pipe.

4. A front end assembly according to claim 2, wherein, The light-transmitting cover is arranged at the opening, and comprises a groove and a convex platform at an inner side.

5. A front end module according to any one of claims 1 to 4, characterized in that The first abutting surface is arranged in the groove and abuts and is attached to the image acquisition surface of the camera module.

6. A front end module according to claim 5, characterized in that The second abutting surface is arranged on the convex platform and abuts and is attached to the light exit surface of the light source.

7. A front end module according to claim 6, characterized in that The mounting surface is provided with a positioning table, and the positioning table cooperates with the mounting surface to realize the installation and positioning of the light source.

8. A front end module according to any one of claims 1 to 4, characterized in that The positioning table is a flexible structure, and cooperates with an inner wall of the convex platform to realize the fixing of the support on the light-transmitting cover. The distal end surface of the positioning table is located between the light exit surface of the light source and the image acquisition surface of the camera module along the axial direction of the curved pipe.

9. A front end module according to any one of claims 1 to 4, characterized in that The light-transmitting cover is provided with a transition surface.

10. An endoscope characterized by comprising: The transition surface is used for realizing the smooth transition between the first abutting surface and the second abutting surface. The cross section of the transition surface comprises a straight line segment and an arc line segment. The straight line segment is close to the second abutting surface, and the arc line segment is close to the first abutting surface. The support is provided with a clamping part. The clamping part cooperates with a peripheral wall of the camera module to realize the fixing of the camera module. The support comprises a flexible section. The clamping part is connected with the fixing base plate through the flexible section. The flexible section has a deformation space along the radial direction of the curved pipe in the assembling cavity. The second abutting surface is arranged at a distal end of the clamping part. The clamping part and the peripheral wall of the camera module have a sliding stroke along the axial direction of the curved pipe. The first abutting surface and the second abutting surface are parallel. The light source and the camera module have a preset gap. The opening is provided with a step surface. The light-transmitting cover comprises a third abutting surface at an inner side. The third abutting surface is located outside the convex platform and abuts and cooperates with the step surface. The handle is connected with a proximal end of the curved pipe.

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