Lens assembly, front end assembly and imaging equipment

Abstract

The invention provides a lens assembly, a front end assembly and imaging equipment. The lens assembly comprises a mounting seat, a lens and a clasping ring. The mounting base comprises a body part and a plurality of elastic parts arranged on the body part. The lens comprises a lens barrel, a lens arranged on the lens barrel and a positioning part connected with the lens barrel. After the lens is mounted on the mounting seat, the plurality of elastic parts surround the periphery of the positioning part. The holding ring abuts against the plurality of elastic parts, and the plurality of elastic parts elastically deform to press the positioning part, so that direct holding assembly of the mounting seat and the lens can be realized, the number of adapters is reduced, and the structural stability is improved.

Description

Technical Field

[0001] This application relates to the field of machine vision technology, and in particular to lens assemblies, front-end assemblies and imaging devices. Background Technology

[0002] With the increasing maturity of vision technology, its applications are becoming more and more widespread. Imaging equipment is typically used for inspection when employing vision technology. The imaging equipment is the core component of a machine vision system, essentially acting as the "eye" of the machine vision system. It is responsible for acquiring images of the product to be inspected and transmitting them to the controller within the imaging equipment system for image processing. Imaging equipment includes lens assemblies. However, existing lens assemblies suffer from poor structural stability. Summary of the Invention

[0003] This application provides a lens assembly, a front-end assembly, and an imaging device that can improve structural stability.

[0004] This application provides a lens assembly, including a mounting base, a lens, and a clamping ring. The mounting base includes a main body and a plurality of elastic parts disposed on the main body. The lens includes a lens barrel, a lens element disposed on the lens barrel, and a positioning part connected to the lens barrel. After the lens is mounted on the mounting base, the plurality of elastic parts surround the periphery of the positioning part. The clamping ring presses against the plurality of elastic parts, and the plurality of elastic parts elastically deform to press the positioning part.

[0005] Furthermore, the main body is provided with a cavity, the lens includes an optical axis segment connected to the positioning part, the optical axis segment is located inside the cavity, the lens barrel is located outside the cavity, and the optical axis segment is overfitted to the main body.

[0006] Furthermore, the clamping ring includes a first fixing part and a second fixing part, with a notch between the first fixing part and the second fixing part. The lens assembly includes a fastener, which fixes the first fixing part and the second fixing part to reduce the notch, so that the clamping ring presses against the plurality of elastic parts.

[0007] Furthermore, the clamping ring includes a front surface and a rear surface opposite to the front surface. After the clamping ring is assembled to the body, the rear surface faces away from the lens barrel, and the clamping ring includes a chamfer disposed on the rear surface side.

[0008] Furthermore, the clamping ring includes a front surface and a rear surface opposite to the front surface. After the clamping ring is assembled to the body, the rear surface faces away from the lens barrel. The clamping ring includes a first mark disposed on the rear surface. When assembling the clamping ring, the first mark faces away from the lens barrel.

[0009] Furthermore, a second mark is provided on the outer diameter surface of the clamping ring, and the second mark faces upward when assembling the clamping ring.

[0010] Furthermore, the mounting base includes a fixing plate and a base plate integrally extended from the fixing plate, the fixing plate and the base plate forming a space, the main body being located within the space, and the base plate being fixed to the outer shell of the imaging device.

[0011] Furthermore, the mounting base includes a connecting plate, and the base plate, the fixing plate and the connecting plate are vertically connected in pairs. The connecting plate is in contact with the outer shell of the imaging device for heat transfer.

[0012] This application also provides a front-end component, including a circuit board assembly and the lens assembly, wherein the circuit board assembly and the mounting base are fixed by a fastener; or, after the front-end component AA is adjusted, the circuit board assembly and the mounting base are welded or bonded to each other.

[0013] Furthermore, the mounting base includes a first mounting surface and an adhesive groove recessed from the first mounting surface, the first mounting surface being used to fit against the second mounting surface of the circuit board assembly, and the adhesive groove being used to fill adhesive.

[0014] Furthermore, the mounting base is provided with a first groove recessed from the first mounting surface for accommodating the photosensitive device of the circuit board assembly, and the adhesive groove surrounds the first groove.

[0015] Furthermore, the mounting base is provided with a second groove formed by recessing from the bottom surface of the first groove for accommodating the filter.

[0016] Furthermore, the mounting base includes a separate fixing plate and a lens mount. The lens mount includes a limiting part that is assembled and fixed with the fixing plate. The main body extends integrally from the limiting part, and the circuit board assembly is fixed with the limiting part.

[0017] Furthermore, the fixing plate has an opening, and the circuit board assembly is located within the opening.

[0018] Furthermore, the mounting base includes a fixing plate, the body portion extends integrally from the fixing plate, and the circuit board assembly is fixed to the fixing plate.

[0019] This application also provides an imaging device, including a housing and the front-end component, the housing forming a receiving cavity, and the front-end component located within the receiving cavity.

[0020] The lens assembly of this application includes a lens, a mounting base, and a clamping ring. The mounting base includes a main body and multiple elastic parts disposed on the main body. The clamping ring presses against the multiple elastic parts, and the multiple elastic parts elastically deform to press the positioning part of the lens. This can realize direct clamping assembly of the mounting base and the lens, reduce the number of adapter parts, and improve structural stability. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of an imaging device according to an embodiment of this application, wherein only a portion of the housing is shown; Figure 2 yes Figure 1 The diagram shows a cross-sectional view of the imaging device, where only a portion of the outer casing is shown. Figure 3 yes Figure 1 A schematic diagram of the lens shown; Figure 4 yes Figure 1 A schematic diagram of the mounting base shown; Figure 5 yes Figure 1 A schematic diagram of the front-end components shown; Figure 6 yes Figure 5 A schematic diagram of the clamping ring of the front-end component is shown; Figure 7 yes Figure 4 A schematic diagram of the mounting bracket from another perspective; Figure 8 yes Figure 5 A schematic diagram of another implementation of the front-end component shown; Figure 9 yes Figure 8 A schematic diagram of the lens mount shown; Figure 10 yes Figure 8 The diagram shows a cross-sectional view of the lens and lens mount after installation. Detailed Implementation

[0022] The technical solutions in the embodiments (or "implementations") of this application will be clearly and completely described herein with reference to the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0023] If there are terms related to directional indications or positional relationships in the embodiments of this application (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial direction, radial direction, circumferential direction, etc.), then such terms are only used to explain the relative positional relationships, movement conditions, etc. between various components in a specific posture (as shown in the attached drawings); if the specific posture changes, then these directional indications or positional relationships will also change accordingly. In addition, terms such as "first" and "second" involved in the embodiments of this application are only for the purpose of convenient description and cannot be construed as indicating or implying relative importance.

[0024] Referring Figures 1 to 2 , the imaging device according to the embodiment of the present application includes a housing 1 and a front-end component 2 fixed to the housing 1. The front-end component 2 includes a lens assembly and a circuit board assembly 23. The lens assembly includes a mounting base 21 and a lens 22 fixed to the mounting base 21. The mounting base 21 is fixed to the housing 1. The circuit board assembly 23 is fixed to the mounting base 21. In one embodiment, the housing 1 defines a receiving cavity 10, and the front-end component 2 is located in the receiving cavity 10. The housing 1 is provided with a viewing window 11 communicating with the receiving cavity 10, and the lens 22 faces the viewing window 11.

[0025] In one embodiment, the housing 1 includes a housing body 13 and a side cover 14 fixed to the housing body 13. The side cover 14 and the housing body 13 define the receiving cavity 10. The housing body 13 includes a plurality of side walls 131, and the viewing window 11 is provided on one of the side walls 131.

[0026] In one embodiment, the side cover 14 and the housing body 13 are detachably connected to facilitate the maintenance of the front-end component 2 and reduce the use cost. The side cover 14 and the housing body 13 can be fixed by means of snap fasteners or screws or by a tight fit.

[0027] In one embodiment, the mounting base 21 contacts the housing 1 for heat transfer, so as to timely dissipate the heat generated by the circuit board assembly 23 to the outside of the imaging device and ensure the imaging quality of the photosensitive device 233 of the imaging device.

[0028] In one embodiment, the mounting base 21 contacts the side cover 14 for heat transfer. In one embodiment, the side wall 131 includes a first side wall 1311 and a second side wall 1312 perpendicular to the first side wall 1311. The first side wall 1311 is located below the mounting base 21, the second side wall 1312 is located in front of the mounting base 21, and the side cover 14 is located on the side of the mounting base 21. In one embodiment, the mounting base 21 is fixed to the first side wall 1311, and the viewing window 11 is provided on the second side wall 1312.

[0029] In one embodiment, a heat-conducting pad 141 is provided between the mounting base 21 and the side cover 14 to improve the heat-conduction efficiency and thus enhance the heat dissipation effect. In another embodiment, the mounting base 21 directly contacts the side cover 14 for heat transfer.

[0030] Refer Figures 2 to 5 , the mounting base 21 includes a fixing plate 211, a bottom plate 212 integrally extending from the fixing plate 211, a connecting plate 214 connecting the fixing plate 211 and the bottom plate 212, and a lens mount 213 fixed to the fixing plate 211. The lens mount 213 is used to fix the lens 22.

[0031] In one embodiment, the bottom plate 212 integrally extends from the fixing plate 211 along the first direction X.

[0032] In one embodiment, the lens mount 213 integrally extends from the fixing plate 211 along the first direction X. The integrated mounting base 21 reduces the number of connecting parts and improves the structural stability of the imaging device.

[0033] The lens 22 includes a lens barrel 221, an optical axis section 222, a lens 223, and a positioning portion 224. The lens barrel 221, the positioning portion 224, and the optical axis section 222 are connected in sequence. The lens 223 is disposed in the lens barrel 221. In one embodiment, an external thread 2241 is provided on the positioning portion 224. In another embodiment, the lens 22 may not be provided with the optical axis section 222, and the positioning portion 224 is assembled and fixed with the lens mount 213.

[0034] In one embodiment, the connecting plate 214 contacts the housing 1 of the imaging device for heat transfer. In one embodiment, the connecting plate 214 contacts the side cover 14 of the housing 1 for heat transfer.

[0035] In one embodiment, the lens mount 213 is cylindrical. In one embodiment, the lens mount 213 is provided with a cavity 2130. The lens barrel 221 is located outside the cavity 2130. The lens 22 includes an optical axis section connected to the positioning portion 224, and the optical axis section 222 is located inside the cavity 2130 to improve the coaxiality of the assembly of the lens 22 and the lens mount 213 and facilitate obtaining a better imaging effect. The length of the optical axis section 222 is less than the length of the cavity 2130.

[0036] In one embodiment, the lens mount 213 is provided with an internal thread 2135 to be threadedly connected with the external thread 2241 on the positioning portion 224. By rotating the lens 22, axial movement can be achieved, facilitating the realization of focusing or height-setting requirements.

[0037] In one embodiment, the mounting base 21 includes a body portion 2131 and a plurality of elastic portions 2132 provided at the front end of the body portion 2131. The cavity 2130 is provided in the body portion 2131. The positioning portion 224 is fixed to the body portion 2131. The body portion 2131 is integrally extended from the fixing plate 211. The plurality of elastic portions 2132 are arranged along the circumferential direction of the cavity 2130. After the lens 22 is mounted to the mounting base 21, the plurality of elastic portions 2132 surround the periphery of the positioning portion 224.

[0038] The elastic portion 2132 can be formed by machining a notch. The number of the elastic portions 2132 should not be too many or too few. If too few, it will be difficult for the elastic portion 2132 to deform. If too many, it will lead to a weakening of the strength of the elastic portion 2132 and affect the structural rigidity after fixation.

[0039] In one embodiment, the body portion 2131 is perpendicular to the fixing plate 211.

[0040] In one embodiment, an internal thread 2135 is provided inside the elastic portion 2132.

[0041] In one embodiment, the optical axis section 222 is in an interference fit with the body portion 2131 to improve the coaxiality of the optical axis section 222 and the body portion 2131, which is beneficial to improving the imaging quality.

[0042] The lens assembly includes a clamping ring 24 sleeved on the periphery of the elastic portion 2132. The clamping ring 24 squeezes the plurality of elastic portions 2132 to deform them, so as to tightly press the positioning portion 224. The direct clamping assembly of the mounting base and the lens can be realized, the number of adapters is reduced, and the structural stability is improved; at the same time, compared with fixing with glue, the assembly is more convenient, easy to disassemble, and the maintenance cost is reduced.

[0043] In one embodiment, the lens 22 is rotated for focusing, and after the focusing is completed, the lens 22 is fixed by the clamping ring 24.

[0044] See Figure 5 and Figure 6 In one embodiment, the clamping ring 24 is provided with a notch portion 241 and a first fixing portion 242 and a second fixing portion 243 located on both sides of the notch portion 241. The lens assembly includes a fastener 3. When the fastener 3 fixes the first fixing portion 242 and the second fixing portion 243, the notch portion 241 is reduced, so that the inner diameter of the clamping ring 24 is reduced, and the clamping ring 24 squeezes the elastic portion 2132 to deform it.

[0045] In one embodiment, the first fixing part 242 is provided with a first assembly hole 2421, and the second fixing part 243 is provided with a second assembly hole 2431. When the clamping ring 24 is sleeved around the elastic part 2132, the fastener 3 is assembled in the first assembly hole 2421 and the second assembly hole 2431 to fix the first fixing part 242 and the second fixing part 243.

[0046] The second assembly hole 2431 can be a through hole or a blind hole. The fastener 3 can be a screw or a bolt. The fastener 3 can be fixed to the second fixing part 243, or it can pass through the second assembly hole 2431 and be fixed to a nut.

[0047] In one embodiment, the clamping ring 24 is provided with a first clearance groove 244 located on one side of the first fixing part 242 to facilitate the assembly of the fastener 3.

[0048] In one embodiment, the clamping ring 24 is provided with a second clearance groove 245 located on one side of the second fixing part 243 to facilitate the assembly of the fastener 3.

[0049] In one embodiment, the first fixing part 242 and the second fixing part 243 are located in the circumferential direction of the clamping ring 24, that is, in the radial direction of the clamping ring 24, and the first fixing part 242 and the second fixing part 243 do not protrude. The length of the notch 241 is equal to the first thickness of the clamping ring 24 in the direction of the central axis, the width of the notch 241 is equal to the second thickness of the clamping ring in the radial direction, and the thickness of the notch 241 is the distance between the first fixing part 242 and the second fixing part 243. When adjusting the fastener 3, the thickness of the notch 241 is adjusted.

[0050] By controlling the dimensional tolerances of the optical axis segment 222 and the cavity 2130, a suitable coaxiality can be achieved. Thanks to this fit, when the pressure generated by tightening the fastener 3 is transmitted to the lens 22, it will not cause excessive movement of the lens 22 in the radial direction, thus ensuring that the focused image is not affected by the fixation of the fastener 3. Furthermore, the lens 22 and the mounting base 21 have good assembly coaxiality, which can reduce the difficulty of assembling the circuit board assembly 23 and obtain better imaging results.

[0051] Both the elastic portion 2132 and the body portion 2131 extend along the first direction X. A gap groove 2133 is provided between two adjacent elastic portions 2132 to increase the elasticity of the elastic portion 2132.

[0052] In one embodiment, the clamping ring 24 includes a front surface 246 facing the lens barrel 221 and a rear surface 247 opposite to the front surface 246. The clamping ring 24 includes a first mark 2471 provided on the rear surface 247. When assembling the clamping ring 24, the first mark 2471 faces away from the lens barrel 221, that is, towards the mounting base 21 side, which is convenient for distinguishing the assembly direction and improving the assembly efficiency. After the clamping ring 24 is assembled, the fastener 3 is located on the left side of the circuit board assembly 23, which is convenient for locking, can prevent the clamping ring 24 from not being tightened due to assembly errors, and improves the assembly efficiency.

[0053] In one embodiment, the first mark 2471 is a rib. The first mark 2471 can also be a pit or a bump or a protrusion, etc.

[0054] In one embodiment, the clamping ring 24 includes a chamfer 2472 provided on the side of the rear surface 247. When the clamping ring 24 is clamped, it can avoid the root area of the elastic part 2132, making the elastic part 2132 easier to deform, so as to obtain a better fixing effect; furthermore, the chamfer 2472 can also be used as a mark, which is convenient for distinguishing the assembly direction when installing the clamping ring 24, improving the assembly efficiency, and after the clamping ring 24 is assembled, the fastener 3 is located on the left side, which is convenient for locking.

[0055] In one embodiment, the clamping ring 24 includes an outer diameter surface 248, and a second mark 2482 is provided on the outer diameter surface 248. When assembling the clamping ring 24, the second mark 2482 faces upward, which is convenient for distinguishing the front and back, making the production consistency better, and can avoid the problem that the positions of the first fixing part 242 and the second fixing part 243 are installed in reverse and it is not easy to rotate the fastener 3.

[0056] In one embodiment, the second mark 2482 is a flat surface. The second mark 2482 can also be a pit or a bump or a protrusion, etc.

[0057] In one embodiment, the thickness of the elastic part 2132 is less than the thickness of the body part 2131, so as to form a rib 2134 on the body part 2131 that is higher than the elastic part 2132. Along the first direction X, the rib 2134 abuts against the clamping ring 24 to define the assembly position of the clamping ring 24.

[0058] In another embodiment, the lens barrel 221 and the lens mount 213 are integrally provided, and a lens 223 is provided on the lens barrel 221 to realize the function of the lens 22, and the structure is simpler, further improving the stability of the imaging device.

[0059] See Figure 2 and Figures 4 to 5 , the circuit board assembly 23 is fixed to the fixing plate 211, and the circuit board assembly 23 and the lens mount 213 are located on opposite sides of the fixing plate 211.

[0060] In one embodiment, the fixing plate 211 is provided with a first hole 2111. The front-end component 2 includes a fixing member 4. The fixing member 4 is assembled in the second hole 231 of the circuit board component 23 and the first hole 2111 of the fixing plate 211 to fix the circuit board component 23 and the fixing plate 211.

[0061] The first hole 2111 can be a through hole or a blind hole. The fixing member 4 can be fixedly connected to the fixing plate 211 by threading, or can be fixed to a nut after passing through the first hole 2111.

[0062] In another embodiment, in one embodiment, after the AA adjustment of the front-end component 2, the mounting base 21 and the circuit board component 23 are fixed by welding. Compared with screw fixing, the production efficiency is improved, and a stable connection is formed, featuring high assembly efficiency and high connection strength.

[0063] AA (Active Alignment) adjustment is a precise alignment technology that adjusts the relative positions of components through real-time feedback. During the assembly process, optical / mechanical performance parameters (such as MTF, focal length, optical axis deviation) are dynamically detected, and micron-level correction is performed using a high-precision motion mechanism.

[0064] In one embodiment, the AA adjustment can be performed by an AA device, which is more simple and convenient to operate and has higher efficiency. In another embodiment, the AA adjustment can also be performed manually.

[0065] During the AA adjustment, it can be that the position of the circuit board component 23 is fixed and the lens component is adjusted, or the position of the lens component is fixed and the circuit board component 23 is adjusted, or both the circuit board component 23 and the lens component are adjusted.

[0066] In one embodiment, the lens component is first assembled, and then the AA adjustment is performed.

[0067] In one embodiment, the circuit board component 23 and the mounting base 21 can be fixed by welding by riveting welding posts on the mounting base 21 when the AA adjustment is completed.

[0068] See Figures 4 to 5 and Figure 7 , in one embodiment, the fixing plate 211 includes a first surface 2112 and a second surface 2113 that are oppositely arranged. The lens mount 213 extends from the first surface 2112. The fixing plate 211 is provided with a first mounting surface 2114. The first mounting surface 2114 and the second surface 2113 are on the same side of the fixing plate 211. Along the thickness direction of the fixing plate 211, the second surface 2113 is higher than the first mounting surface 2114, and the first mounting surface 2114 is used to fit with the second mounting surface 232 of the circuit board component 23.

[0069] In one embodiment, the fixing plate 211 includes a first positioning post 2115 extending from the first mounting surface 2114 for assembly into a first positioning hole (not shown) of the circuit board assembly 23. On the one hand, the circuit board assembly 23 can be pre-positioned to facilitate the alignment of the second hole 231 with the first hole 2111, facilitating the assembly of the fixing member 4; on the other hand, the stability of the circuit board assembly 23 can also be increased.

[0070] In one embodiment, the fixing plate 211 is provided with an adhesive groove 2116 recessed from the first mounting surface 2114 for filling with adhesive to bond and fix the circuit board assembly 23 to the fixing plate 211, increasing the stability of the circuit board assembly 23; and it can prevent water leakage from the gap between the circuit board assembly 23 and the fixing plate 211; the adhesive can also be sealed to prevent external dust from entering.

[0071] In one embodiment, in order to improve the stability of the fixation of the circuit board assembly 23 and the mounting seat 21 after AA adjustment, before AA adjustment, glue is applied to the first mounting surface 2114 or the second mounting surface 232 or the adhesive groove 2116. After completing the AA adjustment, the circuit board assembly 23 and the fixing plate 211 are bonded and fixed through the curing of the glue.

[0072] Refer Figure 2 and Figure 7 In one embodiment, the fixing plate 211 is provided with a first groove 2117 recessed from the first mounting surface 2114 along the first direction X for accommodating the photosensitive device 233 of the circuit board assembly 23 to improve the performance of the imaging device. The adhesive groove 2116 is disposed around the first groove 2117. The first positioning post 2115 is assembled into a first positioning hole (not shown) of the circuit board assembly 23, which can also ensure the coincidence of the centers of the photosensitive device 233 and the lens 22.

[0073] In one embodiment, the fixing plate 211 is provided with a second groove 2118 recessed from the bottom surface of the first groove 2117 along the first direction X for accommodating a filter (not shown) to improve the performance of the imaging device.

[0074] The mounting seat 21 of the embodiment of the present application realizes the assembly of the lens 22 and the circuit board assembly 23, and can be directly fixed on the housing 1, and realizes the function of heat conduction.

[0075] Refer Figure 1 and Figure 7 In one embodiment, the bottom plate 212 is used to fix to the housing 1 of the imaging device.

[0076] In one embodiment, the bottom plate 212 includes an upper surface 2121 facing the lens holder 213 and a lower surface 2122 disposed opposite to the upper surface 2121. The bottom plate 212 includes a second positioning post 2123 protruding from the lower surface 2122 for being installed in the second positioning hole 1313 of the housing 1 to ensure the accurate assembly position between the mounting seat 21 and the housing 1.

[0077] In one embodiment, the bottom plate 212 includes a first assembly groove 2124 recessed from the lower surface 2122. A first boss 2125 is provided in the first assembly groove 2124. The second positioning post 2123 extends from the first boss 2125. The first assembly groove 2124 is used for installing a first gasket (not shown) to prevent water leakage at the second positioning hole 1313 and improve the protection level of the imaging device.

[0078] In one embodiment, the bottom plate 212 includes a second assembly groove 2126 recessed from the lower surface 2122. A second boss 2127 is provided in the second assembly groove 2126. The second boss 2127 is provided with a first limiting hole 2128. The imaging device includes a locking member 5. The locking member 5 is assembled in the first limiting hole 2128 after passing through the second limiting hole 1314 of the housing 1 and is fixed to the second boss 2127. The second assembly groove 2126 is used for installing a second gasket (not shown) to prevent water leakage at the second limiting hole 1314 and improve the protection level of the imaging device.

[0079] Refer Figures 8 to 10 , in one embodiment, the mounting seat 21 includes a split fixing plate 211 and a lens holder 213. The lens holder 213 is assembled to the fixing plate 211.

[0080] In one embodiment, the lens holder 213 includes a limiting portion 2136 extending from the first end of the body portion 2131. The limiting portion 2136 is assembled to the fixing plate 211. The body portion 2131 includes a second end opposite to the first end, and a plurality of elastic portions 2132 are provided at the second end.

[0081] In one embodiment, the limiting portion 2136 and the fixing plate 211 are fixed by a locking member 6 to facilitate the assembly and disassembly of the lens holder 213. A third hole 2137 is provided on the limiting portion 2136, and a fourth hole (not shown) is provided on the fixing plate 211. The locking member 6 is assembled in the third hole 2137 and the fourth hole to fix the limiting portion 2136 and the fixing plate 211. The fourth hole can be a blind hole or a through hole. The locking member 6 can be threadedly connected to the fixing plate 211 or fixed to a nut after passing through the fourth hole.

[0082] In one embodiment, the circuit board assembly 23 is fixed to the limiting portion 2136. The body portion 2131 and the circuit board assembly 23 are respectively located on opposite sides of the limiting portion 2136. The fixing plate 211 is provided with an opening 2119 to accommodate the circuit board assembly 23.

[0083] In one embodiment, the limiting portion 2136 is provided with a fifth hole 21361. The imaging device includes a third fixing member 7. The third fixing member 7 is assembled in the second hole 231 of the circuit board assembly 23 and the fifth hole 21361 of the limiting portion 2136 to fix the circuit board assembly 23 and the limiting portion 2136.

[0084] The fifth hole 21361 can be a through hole or a blind hole. The third fastener 7 can be threaded to the limiting part 2136, or it can pass through the fifth hole 21361 and be fixed with a nut.

[0085] The limiting portion 2136 includes a first surface 2112 and a first mounting surface 2114 disposed opposite to each other. The body portion 2131 extends from the first surface 2112. The first mounting surface 2114 is used to fit against the second mounting surface 232 of the circuit board assembly 23.

[0086] In one embodiment, the limiting part 2136 is provided with an adhesive groove 2116 recessed from the first mounting surface 2114 for filling adhesive to bond and fix the circuit board assembly 23 and the limiting part 2136, thereby increasing the stability of the circuit board assembly 23 and preventing water leakage from the gap between the circuit board assembly 23 and the limiting part 2136.

[0087] In one embodiment, the limiting portion 2136 has a first groove 2117 recessed from the first mounting surface 2114 along a first direction X for accommodating the photosensitive device 233 of the circuit board assembly 23, thereby improving the performance of the imaging device. An adhesive groove 2116 surrounds the first groove 2117.

[0088] In one embodiment, the limiting portion 2136 is provided with a second groove 2118 formed by recessing from the bottom surface of the first groove 2117 along the first direction X, for accommodating a filter (not shown) to improve the performance of the imaging device.

[0089] It should be noted that the technical solutions or features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A lens assembly, characterized in that, include: The mounting base includes a main body and a plurality of elastic portions disposed on the main body; The lens includes a lens barrel, a lens disposed in the lens barrel, and a positioning part connected to the lens barrel. After the lens is installed in the mounting base, a plurality of elastic parts surround the periphery of the positioning part. A clamping ring presses against a plurality of elastic portions, which elastically deform to press against the positioning portion.

2. The lens assembly according to claim 1, characterized in that, The main body is provided with a cavity, the lens includes an optical axis segment connected to the positioning part, the optical axis segment is located inside the cavity, the lens barrel is located outside the cavity, and the optical axis segment is overfitted to the main body.

3. The lens assembly according to claim 1, characterized in that, The clamping ring includes a first fixing part and a second fixing part, with a notch between the first fixing part and the second fixing part. The lens assembly includes a fastener, which fixes the first fixing part and the second fixing part to reduce the notch, so that the clamping ring presses against the plurality of elastic parts.

4. The lens assembly according to claim 3, characterized in that, The clamping ring includes a front surface and a rear surface opposite to the front surface. After the clamping ring is assembled to the body, the rear surface faces away from the lens barrel. The clamping ring includes a chamfer disposed on the rear surface side.

5. The lens assembly according to claim 3, characterized in that, The clamping ring includes a front surface and a rear surface opposite to the front surface. After the clamping ring is assembled to the body, the rear surface faces away from the lens barrel. The clamping ring includes a first mark disposed on the rear surface. When assembling the clamping ring, the first mark faces away from the lens barrel.

6. The lens assembly according to claim 3, characterized in that, The outer diameter surface of the clamping ring is provided with a second mark, and when assembling the clamping ring, the second mark faces upward.

7. The lens assembly according to any one of claims 1 to 6, characterized in that, The mounting base includes a fixing plate and a base plate integrally extended from the fixing plate. The fixing plate and the base plate enclose a space, the main body is located in the space, and the base plate is fixed to the outer shell of the imaging device.

8. The lens assembly according to claim 7, characterized in that, The mounting base includes a connecting plate, and the base plate, the fixing plate and the connecting plate are vertically connected in pairs. The connecting plate is in contact with the outer shell of the imaging device for heat transfer.

9. A front-end component, characterized in that, The device includes a circuit board assembly and a lens assembly as described in any one of claims 1 to 8, wherein the circuit board assembly and the mounting base are fixed by a fastener; or, after the front-end assembly AA is adjusted, the circuit board assembly and the mounting base are welded or bonded together.

10. The front-end component according to claim 9, characterized in that, The mounting base includes a first mounting surface and an adhesive groove recessed from the first mounting surface. The first mounting surface is used to fit against the second mounting surface of the circuit board assembly, and the adhesive groove is used to fill adhesive.

11. The front-end component according to claim 10, characterized in that, The mounting base has a first groove recessed from the first mounting surface for accommodating the photosensitive device of the circuit board assembly, and the adhesive groove surrounds the first groove.

12. The front-end component according to claim 11, characterized in that, The mounting base has a second groove formed by recessing from the bottom surface of the first groove for accommodating the filter.

13. The front-end component according to claim 9, characterized in that, The mounting base includes a separate fixing plate and a lens mount. The lens mount includes a limiting part that is assembled and fixed with the fixing plate. The main body extends integrally from the limiting part, and the circuit board assembly is fixed with the limiting part.

14. The front-end component according to claim 13, characterized in that, The fixing plate has an opening, and the circuit board assembly is located within the opening.

15. The front-end component according to claim 9, characterized in that, The mounting base includes a fixing plate, the main body extends integrally from the fixing plate, and the circuit board assembly is fixed to the fixing plate.

16. An imaging device, characterized in that, include: The housing and the front-end assembly as described in any one of claims 9 to 15, wherein the housing forms a receiving cavity and the front-end assembly is located within the receiving cavity.

Images