Lens module fixing mechanism with stress buffering function

Abstract

The utility model provides a lens module fixing mechanism with stress buffering function, it is applied to fixing a lens module, the image side end of lens module has a circuit board. The lens module fixing mechanism with stress buffering function includes a metal support, a sticking piece and a shell piece. The metal support is formed by sheet metal. The metal support has a bearing surface. The sticking piece is arranged on the bearing surface, and the circuit board is fixed on the metal support by the sticking piece. The shell piece is sleeved on the periphery of the lens module and is fixed on the metal support. The utility model can effectively buffer the torsion and deformation stress generated during the process of locking the screw along the optical axis, and avoid affecting the optical performance such as SFR and MTF, which are image quality judgment indexes.

Description

Technical Field

[0001] This utility model relates to a lens module fixing technology, and more particularly to a lens module fixing mechanism with stress buffering function that uses a thin sheet metal with elastic properties and an adhesive structure to fix the lens module to the device body. Through this dual elastic structure design, the torsional and deformation stress generated during screw fastening can be effectively buffered, avoiding impact on image quality assessment indicators such as spatial frequency response (SFR) and modulation transfer function (MTF) optical performance. Background Technology

[0002] In existing lens module assembly designs, the lens module is typically secured directly to the plastic cover body with screws. However, this structure has significant drawbacks, especially when the flatness of the plastic cover's mounting surface is insufficient. The stress experienced by the lens module during the securing process is unevenly transmitted to the underlying circuit board (PCBA), leading to PCBA deformation. This deformation alters the relative position and focal length between the lens module and the image sensor (such as CMOS), thus affecting the overall optical path and image quality. Especially with the increasing miniaturization and precision of modern lens modules, even minute deformations can lead to a decrease in image resolution, causing optical performance indicators such as spatial frequency response (SFR) and modulation transfer function (MTF) to deviate or fail to meet quality specifications (out of specification).

[0003] To address the aforementioned issues, existing technologies have attempted to improve the deformation effect by adding buffer pads or locally adjusting the locking structure. However, most of these methods still fail to effectively resolve the problems of overall module deformation and unstable optical performance caused by locking stress.

[0004] In summary, the inventors of this utility model have designed a lens module fixing mechanism with stress buffering function to improve upon the deficiencies of existing technologies and thereby enhance its industrial application. Utility Model Content

[0005] In view of the problems of the prior art, the purpose of this utility model is to provide a lens module fixing mechanism with stress buffering function to improve the problems existing in the prior art.

[0006] To achieve the above objectives, this utility model provides a lens module fixing mechanism with stress buffering function, which is used to fix a lens module, the image side of which has a circuit board. The lens module fixing mechanism with stress buffering function includes a metal bracket, an adhesive component, and a housing component. The metal bracket is formed of a thin sheet of metal. The metal bracket has a bearing surface. The adhesive component is disposed on the bearing surface, and the circuit board is fixed to the metal bracket by the adhesive component. The housing component is sleeved around the outer periphery of the lens module and fixed to the metal bracket.

[0007] Preferably, the stress-buffering lens module fixing mechanism includes a sealing ring. The sealing ring is sleeved on the lens module and is located between the lens module and the housing.

[0008] Preferably, the sealing ring is fitted onto the object side of the lens module.

[0009] Preferably, the metal bracket is fixed to the housing by a locking method, and the locking direction is along the optical axis of the lens module.

[0010] Preferably, the two ends of the metal bracket are formed by integrally bending the two sides of the metal bracket body to form two locking parts, which are then locked to the outer shell by screws passing through the locking parts.

[0011] Preferably, an arc-shaped portion connects the locking part to the body of the metal bracket.

[0012] Preferably, the two sides of the metal bracket body are integrally bent to form positioning portions. The positioning portions are located between the two locking portions.

[0013] Preferably, the metal support is formed of a thin sheet metal with a thickness of less than 0.2 mm.

[0014] Preferably, the adhesive element is a thermally conductive pad.

[0015] Preferably, the stress-buffered lens module fixing mechanism is configured to maintain the values ​​of the spatial frequency response (SFR) and modulation transfer function (MTF) of the lens module in the state before locking.

[0016] The technical features of this utility model will be described in detail below with reference to specific embodiments and accompanying drawings, so that those skilled in the art can easily understand the purpose, technical features and advantages of this utility model. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art to which this utility model pertains, other drawings can be obtained based on these drawings.

[0018] Figure 1 This is an exploded view of the lens module fixing mechanism with stress buffering function of this utility model.

[0019] Figure 2 This is a schematic diagram of the lens module fixing mechanism with stress buffering function of this utility model.

[0020] Figure 3 This is a schematic diagram of the metal bracket of the lens module fixing mechanism with stress buffering function of this utility model.

[0021] Figure 4 This is a schematic diagram of the first buffer limit of the lens module fixing mechanism with stress buffering function of this utility model.

[0022] Figure 5 This is a schematic diagram of the second buffer limit of the lens module fixing mechanism with stress buffering function of this utility model.

[0023] The following are the labeling elements in the figure:

[0024] 100: Lens module fixing mechanism with stress buffering function;

[0025] 1: Lens module;

[0026] 11: Circuit board;

[0027] 2: Metal bracket;

[0028] 21: Bearing surface;

[0029] 22: Locking part;

[0030] 23: Arc-shaped part;

[0031] 24: Positioning section;

[0032] 3: Adhesive components;

[0033] 4: Housing components;

[0034] 5: Sealing ring. Detailed Implementation

[0035] The advantages, features, and technical methods of this utility model will be more readily understood by referring to the exemplary embodiments and accompanying drawings. This utility model can be implemented in different forms and should not be construed as limited to the embodiments set forth herein. Rather, the embodiments provided will enable those skilled in the art to more thoroughly and completely convey the scope of this utility model, which will be defined only by the appended claims.

[0036] It should be understood that although the terms "first," "second," etc., may be used in this invention to describe various elements, components, regions, sections, layers, and / or parts, these elements, components, regions, sections, layers, and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, section, layer, and / or part from another element, component, region, section, layer, and / or part.

[0037] In this specification, the terms "comprising," "including," or any other variations thereof are intended to cover a 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. Without further limitation, 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 said element.

[0038] Unless otherwise defined, all terms used in this invention (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and this invention, and will not be interpreted as having an idealized or overly formal meaning unless expressly defined herein.

[0039] It should also be understood that the terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and / or the appended claims, unless the context clearly indicates otherwise, the singular forms "a" and "described" are intended to include the plural forms.

[0040] Please refer to the following: Figures 1 to 5 . Figure 1 This is an exploded view of the lens module fixing mechanism with stress buffering function of this utility model. Figure 2 This is a schematic diagram of the lens module fixing mechanism with stress buffering function of this utility model. Figure 3This is a schematic diagram of the metal bracket of the lens module fixing mechanism with stress buffering function of this utility model. Figure 4 , 5 This is a schematic diagram of the buffer limit of the lens module fixing mechanism with stress buffering function of this utility model.

[0041] As shown in the figure, the stress-buffering lens module fixing mechanism 100 of this utility model is used to fix a lens module 1, the image side end of which has a circuit board 11. The stress-buffering lens module fixing mechanism 100 mainly includes a metal bracket 2, an adhesive component 3, and a housing component 4; additionally, in a preferred embodiment, the stress-buffering lens module fixing mechanism 100 includes a sealing ring 5.

[0042] The metal bracket 2 is formed of a thin sheet of metal; preferably, the metal bracket is formed of a thin sheet of metal with a thickness of less than 0.2 mm. The metal bracket 2 has a bearing surface 21. An adhesive 3 is disposed on the bearing surface 21, and the circuit board 11 is fixed to the metal bracket 2 by means of the adhesive 3; preferably, the adhesive 3 is a thermally conductive pad. The outer shell 4 may be made of plastic material, which is sleeved on the outer periphery of the lens module 1 and fixed to the metal bracket 2.

[0043] The lens module fixing mechanism 100 with stress buffering function is configured to maintain the spatial frequency response (SFR) and modulation transfer function (MTF) values ​​of the lens module 1 in the state before locking.

[0044] It is worth mentioning that the metal bracket 2 and the outer casing 4 are fixed by a locking method, with the locking direction along the optical axis of the lens module 1. Preferably, both ends of the metal bracket 2 are formed by integrally bending the two sides of the body of the metal bracket 2 opposite to each other to form two locking parts 22, which are locked to the outer casing 4 by screws passing through the locking parts 22. An arc-shaped part 23 connects the locking part 22 to the body of the metal bracket 2. Both sides of the body of the metal bracket 2 are integrally bent to form a positioning part 24. The positioning part 24 is located between the two locking parts 22.

[0045] The sealing ring 5 is fitted onto the lens module 1 and is located between the lens module 1 and the outer casing 4. The sealing ring 5 is fitted onto the object side end of the lens module 1.

[0046] More specifically, the lens module fixing mechanism 100 is mainly used to fix a lens module 1 and ensure that the lens module 1 can maintain its optical performance stability during assembly, especially to avoid the stress generated during the locking process from affecting its spatial frequency response (SFR) and modulation transfer function (MTF) values.

[0047] The lens module fixing mechanism 100 of this embodiment mainly includes the following components: a metal bracket 2, an adhesive component 3, and a housing component 4, and optionally also includes a sealing ring 5. The structure of each component and the way they are connected are described below.

[0048] First, the lens module 1 is an assembly integrating an optical lens and an image sensing element. Its object side faces the imaging target, while its image side has a contact area connected to the circuit board 11. The circuit board 11 is disposed on the image side of the lens module 1 and is mainly responsible for transmitting image signals and connecting to the main system circuit. Since this area contains a precision CMOS sensing element, it is extremely sensitive to strain and torque, so a special structure is required to prevent deformation.

[0049] To achieve the above objectives, this utility model specifically designs a metal bracket 2, which is made of thin sheet metal with a thickness of less than 0.2 mm, possessing basic structural rigidity while still retaining a certain degree of elasticity. The metal bracket 2 has a bearing surface 21, and the lens module 1, along with the circuit board 11 below it, is fixed to the bearing surface 21 by an adhesive 3. In this embodiment, the adhesive 3 is a thermally conductive pad, which not only provides a bonding function but also has a buffering and heat-conducting effect, helping to absorb minor deformations or stress transmission generated during assembly.

[0050] Furthermore, to secure the lens module 1 within the final device structure, this invention includes a housing 4, which is fitted around the periphery of the lens module 1 and combined with the metal bracket 2. Specifically, the metal bracket 2 has two integrally bent sides forming two locking portions 22. These locking portions 22 extend along the optical axis of the lens module (e.g., the Z-axis), allowing screws to pass through them and lock the metal bracket 2 to the corresponding position on the housing 4. In this way, although screws are still ultimately required for securing, the force is first buffered and dispersed by the elastic and adhesive properties of the adhesive 3 and the thin sheet metal bracket 2, effectively preventing stress from being transmitted to the circuit board 11 and causing it to bend and deform.

[0051] Furthermore, an arc-shaped portion 23 is provided between the locking part 22 and the body of the metal bracket 2. The arc-shaped portion can further enhance the buffering capacity of the overall structure and prevent cracks or fatigue damage caused by stress concentration at the bending point. This design allows the metal bracket 2 to deform slightly when subjected to the locking force, thereby mitigating its impact on the lens module 1 and the circuit board 11 through elastic energy absorption.

[0052] To ensure the accuracy of assembly positioning, positioning parts 24 are also provided on both sides of the metal bracket 2. The positioning parts 24 are located between the two locking parts 22. Preferably, the positioning parts 24 can define the position of the circuit board 11, or further fit or engage with the corresponding structure of the housing 4, so that the lens module 1 can be automatically aligned during assembly, avoiding displacement or tilting, and improving the stability and assembly efficiency of the overall module.

[0053] In addition to the aforementioned fixing and buffering structures, to further enhance the positioning and shock resistance of the lens module 1 in other directions perpendicular to the optical axis (such as the X and Y axes), this invention also includes a sealing ring 5. The sealing ring 5 is fitted onto the object-side end of the lens module 1, i.e., near the external image source, and its installation position is between the lens module 1 and the outer casing 4. Besides providing airtightness and dustproofing, the sealing ring 5 can be made of rubber. Utilizing the elastic properties of rubber, it can provide slight positioning and shock absorption in the horizontal direction, allowing the lens module 1 to maintain accurate positioning even when subjected to slight vibrations or external forces.

[0054] In summary, the lens module fixing mechanism 100 with stress buffering function has a multi-layered buffering mechanism, including: the adhesiveness and elasticity of the thermally conductive pad (adhesive 3), the micro-deformability of the metal bracket 2 made of thin sheet metal, the structural buffering of the arc-shaped portion 23, and the limiting function of the sealing ring 5 in the horizontal direction. The combination of these structures not only ensures the precise alignment of the lens module 1 during assembly, but also resists thermal expansion and contraction, external vibration, or structural fatigue caused by long-term use during the final product's use, thereby significantly improving the stability of image quality.

[0055] The key innovation of this invention lies in utilizing an extremely thin yet flexible metal support layer to bear the stress of the lens module. By placing screws between the metal support and the outer casing, the circuit board is indirectly protected from stress interference. Furthermore, energy absorption characteristics are further introduced through deformable structures (such as arc-shaped portions), allowing the entire module to maintain its optical parameters, such as spatial frequency response (SFR) and modulation transfer function (MTF), even after assembly, ensuring the consistency and reliability of measurement data.

[0056] Therefore, compared to the traditional design where lens modules are directly locked to the plastic body structure, this utility model uses a buffer fixing method that combines metal and elastic adhesive to effectively absorb or disperse stress concentration caused by poor flatness or inconsistent locking force. It is particularly suitable for today's miniaturized and precision consumer or automotive lens module systems.

[0057] In the several embodiments provided by this utility model, it should be understood that the disclosed device can be implemented in other ways. For example, the above embodiments can be arbitrarily combined and applied without conflict; for example, the device embodiments described above are merely illustrative, and the division of modules is merely a logical functional division, and there may be other division methods in actual implementation; for example, multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0058] The modules described as separate components may or may not be physically separate. The components shown as modules may or may not be physical modules; that is, they may be located in one place or distributed across multiple network modules. Some or all of the modules can be selected to achieve the purpose of the embodiment solution according to actual needs.

[0059] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A lens module fixing mechanism with stress buffering function, used for fixing a lens module, characterized in that, The image-side end of the lens module has a circuit board; the lens module fixing mechanism with stress buffering function includes: The metal support is formed from a thin sheet of metal; the metal support has a load-bearing surface. An adhesive element is disposed on the bearing surface, and the circuit board is fixed to the metal bracket by means of the adhesive element; and The outer casing is fitted around the periphery of the lens module and fixed to the metal bracket.

2. The lens module fixing mechanism with stress buffering function as described in claim 1, characterized in that, The stress-buffering lens module fixing mechanism includes a sealing ring; the sealing ring is sleeved on the lens module and is located between the lens module and the outer shell.

3. The lens module fixing mechanism with stress buffering function as described in claim 2, characterized in that, The sealing ring is fitted onto the object side of the lens module.

4. The lens module fixing mechanism with stress buffering function as described in any one of claims 1 to 3, characterized in that, The metal bracket is fixed to the outer casing by a locking method, and the locking direction is along the optical axis of the lens module.

5. The lens module fixing mechanism with stress buffering function as described in claim 4, characterized in that, The two ends of the metal bracket are formed by integrally bending the two sides of the metal bracket body to form two locking parts; wherein, screws pass through the locking parts to lock the outer shell.

6. The lens module fixing mechanism with stress buffering function as described in claim 5, characterized in that, An arc-shaped portion connects the locking part to the body of the metal bracket.

7. The lens module fixing mechanism with stress buffering function as described in claim 5, characterized in that, The two sides of the main body of the metal bracket are integrally bent to form positioning parts; the positioning parts are located between the two locking parts.

8. The lens module fixing mechanism with stress buffering function as described in claim 5, characterized in that, The metal support is formed of a thin sheet of metal with a thickness of less than 0.2 mm.

9. The lens module fixing mechanism with stress buffering function as described in claim 1, characterized in that, The adhesive component is a thermally conductive pad.

10. The lens module fixing mechanism with stress buffering function as described in claim 1, characterized in that, The lens module fixing mechanism with stress buffer function is configured to maintain the spatial frequency response value and modulation conversion function value of the lens module in the state before locking.

Images