Reflection module and camera module

Abstract

The application relates to a reflection module and a camera module. The reflection module comprises: an optical path assembly, the optical path assembly comprising a first lens, a light reflection element and a second lens; a mounting bracket configured to support the first lens; a motor carrier configured to carry the light reflection element and the second lens, the motor carrier being provided with a containing cavity with an opening, and the motor carrier having a first side wall, the light reflection element being arranged in the containing cavity, the second lens being arranged on the first side wall, the first side wall and the opening being located on the light-incident side and the light-emitting side of the light reflection element respectively; wherein the mounting bracket is arranged on the opening, and the light reflection element is configured to reflect light incident on the first lens to the second lens. The reflection module and the camera module provided by the application realize integrated positioning of the light reflection element and the lens, and avoid the adverse effects of multi-stage assembly tolerance accumulation on the imaging quality of the reflection module.

Description

Technical Field

[0001] This application relates to the field of optical imaging technology, and in particular to a reflection module and a camera module. Background Technology

[0002] With the trend towards thinner and lighter mobile devices and higher performance in photography, optical imaging modules are increasingly moving towards miniaturization and higher pixel counts. To achieve long focal lengths within limited space, the industry commonly employs a periscope structure, which uses light-reflecting elements to deflect the incident light path, thereby extending the optical path length in the vertical space. In a periscope structure, the assembly precision of the light-reflecting elements and subsequent lens groups affects the optical axis alignment and image quality.

[0003] In existing technologies, the optical reflective element is typically assembled with the motor carrier assembly first. Then, at least one lens is pre-fixed to a separate lens holder, which is then assembled to the motor carrier. The final lens undergoes active alignment and centering compensation based on this semi-finished product to correct the aforementioned accumulated tolerances and ensure optical path collimation. However, because the first-installed lens needs to be indirectly fixed to the motor carrier via the lens holder, the tolerance chain between it and the reflector is relatively long, resulting in a large relative positional deviation between the two. This increases the optical compensation required for the subsequently installed lens, limits the adjustment range, and affects yield and performance stability. Utility Model Content

[0004] This application discloses a reflection module and a camera module, which realizes the integrated positioning of the light reflection element and the lens, avoiding the adverse effects of the accumulation of multi-level assembly tolerances on the imaging quality of the reflection module.

[0005] To achieve the above objectives, a first aspect of this application discloses a reflection module, which includes:

[0006] An optical path assembly, the optical path assembly including a first lens, a light reflecting element, and a second lens;

[0007] Mounting bracket, configured to support the first lens;

[0008] A motor carrier is configured to carry the light reflecting element and the second lens and drive the light reflecting element and the second lens to move. The motor carrier forms a receiving cavity with an opening and has a first sidewall. The opening and the first sidewall are located on different sides of the receiving cavity. The light reflecting element is disposed in the receiving cavity, and the second lens is disposed on the first sidewall. The first sidewall and the opening are respectively located on the light emitting side and the light entering side of the light reflecting element.

[0009] The mounting bracket is disposed in the opening, and the optical axis of the second lens intersects the optical axis of the first lens. The light reflecting element is configured to reflect the light incident from the first lens to the second lens.

[0010] Compared with the prior art, the beneficial effects of this application are:

[0011] The reflection module provided in this application integrates the light reflection element and the second lens on the same motor carrier, with the first lens mounted on the mounting bracket. This shortens the assembly tolerance chain between the light reflection element and the second lens, thereby improving the relative positional accuracy between the reflecting surface of the light reflection element and the optical axis of the second lens. It also reduces the difficulty and requirement of centering compensation for the first lens, which is beneficial to improving the yield and consistency of the reflection module.

[0012] As an alternative implementation, the first lens has at least one convex surface to give the first lens positive optical power, and the first lens is configured to converge light rays; and / or, the second lens has at least one concave surface to give the second lens negative optical power, and the second lens is configured to expand light rays.

[0013] The first lens converges the light beam, reducing the beam diameter entering the subsequent optical path. This allows the beam to pass through the opening on the motor carrier more efficiently, improving the utilization efficiency of light energy. The negative optical power of the second lens moderately expands the converged beam, better matching the incident requirements of the subsequent imaging lens group. This avoids problems such as uneven image illumination or insufficient utilization of the aperture of subsequent lenses that may result from excessive beam concentration.

[0014] As an optional implementation, the motor carrier further has a support groove disposed at the opening edge of the motor carrier, the support groove being configured to support the mounting bracket; the mounting bracket includes a connecting portion disposed on the side of the mounting bracket, the surface of the connecting portion facing the motor carrier being configured to abut against the bottom of the support groove, so that the mounting bracket is connected to the motor carrier.

[0015] The support groove provides a clear installation position for the mounting bracket. The movement of the mounting bracket within the bottom surface of the support groove is constrained by the groove wall, which limits the displacement of the mounting bracket relative to the motor carrier. This improves the repeatability and consistency of the optical axis position of the first lens, and ensures the accuracy of the incident light path between the first lens and the light reflecting element.

[0016] As an optional implementation, there are multiple connecting parts and multiple bearing grooves, with the multiple connecting parts spaced apart circumferentially along the mounting bracket and the multiple bearing grooves spaced apart circumferentially along the opening.

[0017] The circumferentially spaced configuration of multiple connecting parts and multiple bearing grooves enables uniform force and support at multiple points between the mounting bracket and the motor carrier, avoiding excessive stress concentration in local areas. This reduces the risk of deformation or cracking of the mounting bracket or motor carrier due to long-term stress concentration, and improves the structural reliability and long-term durability of the reflective module.

[0018] As an optional implementation, there is a gap between the sidewall of the bearing groove and the sidewall of the connecting part, and there is a gap between the sidewall of the mounting bracket and the inner sidewall of the opening.

[0019] The spacing absorbs the unavoidable dimensional deviations in component manufacturing. Even if the size of a single part is at the limit of the tolerance zone, it will not cause assembly interference or jamming between the mounting bracket and the motor carrier. This improves the interchangeability of parts and the yield of assembly, and reduces the screening or scrap costs caused by the cumulative tolerance of the dimensional chain.

[0020] As an optional implementation, the mounting bracket has a first mounting portion with a first mounting hole. The first mounting portion is used to mount the first lens. The first mounting hole extends through the first mounting portion along the optical axis of the first lens. The edge of the first end face of the first mounting hole is recessed toward the second end face to form a first mounting groove around the periphery of the first mounting hole. The surface of the first mounting groove opposite to the receiving cavity is configured to abut against the bottom surface of the first lens. The sidewall of the first mounting groove abuts against the lateral peripheral surface of the first lens.

[0021] The first mounting slot provides positioning and bearing space for the first lens, determines the position of the first lens in the optical axis direction, ensures the accuracy of the focal length of the optical system, constrains the movement of the first lens in the plane perpendicular to the optical axis, ensures the coincidence of the optical center and the mechanical axis of the first lens, reduces the eccentricity and tilt of the first lens, and thus eliminates the risk of lens surface shape changes or positional disturbances caused by shrinkage stress during the adhesive curing process.

[0022] As an optional implementation, the motor carrier has a mounting surface and a second mounting portion. The mounting surface is located on the bottom surface of the motor carrier so that the receiving cavity is formed above the mounting surface. The mounting surface is used to support the light reflecting element. The second mounting portion is disposed on the first sidewall and is disposed opposite to the mounting surface along the direction of the optical axis of the second lens. The second mounting portion is used to mount the second lens.

[0023] The mounting surface provides a bearing reference for the light reflector, enhancing the mounting rigidity and stability of the light reflector on the motor carrier. It prevents the light reflector from shifting or deflecting when subjected to external forces or vibrations, thereby reducing the risk of external interference and damage and avoiding the tolerance accumulation problem caused by stacking multiple parts in traditional designs.

[0024] As an optional implementation, the second mounting portion has a second mounting hole that extends through the second mounting portion along the direction of the optical axis of the second lens. The edge of the first end face of the second mounting hole is recessed toward the second end face to form a second mounting groove around the periphery of the second mounting hole. The surface of the second mounting groove away from the receiving cavity is configured to abut against the bottom surface of the second lens, and the sidewall of the second mounting groove abuts against the lateral peripheral surface of the second lens.

[0025] The second mounting slot provides positioning and bearing space for the second lens, determines the position of the second lens in the optical axis direction, constrains the movement of the second lens in the plane perpendicular to the optical axis, ensures the coincidence of the optical center and mechanical axis of the second lens, reduces the eccentricity and tilt of the second lens, and thus eliminates the risk of lens surface shape change or positional disturbance caused by shrinkage stress during the adhesive curing process.

[0026] As an optional implementation, the surface of the motor carrier with the opening is provided with a plurality of indicator marks, which are spaced apart circumferentially along the opening. All the indicator marks form a central indicator pattern, and the projection of the geometric center of the central indicator pattern along the optical axis of the first lens coincides with the projection of the center of the light reflecting element along the optical axis of the first lens.

[0027] The center indicator pattern provides an intuitive and precise visual alignment reference during assembly. Operators or automated vision recognition systems can quickly and accurately determine the projected position of the theoretical center point of the light-reflecting element on the motor carrier opening plane using these circumferentially spaced indicator marks.

[0028] A second aspect of this application discloses a camera module, comprising: a reflection module as described in the first aspect of this application; a lens module, the lens module being held on the light reflection path of the reflection module; an imaging module, the imaging module receiving light emitted from the lens module to form an image; a base, the base having a placement cavity, the reflection module and the lens module being disposed within the placement cavity; and a housing, the housing covering the base.

[0029] The reflection module in the camera module provided in this application integrates the light reflection element and the second lens on the same motor carrier, and the first lens is set on the mounting bracket. This shortens the assembly tolerance chain between the light reflection element and the second lens, thereby improving the relative positional accuracy between the reflecting surface of the light reflection element and the optical axis of the second lens, reducing the difficulty and requirement of centering compensation of the first lens, and helping to improve the yield and consistency of the reflection module. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of a reflection module in the prior art;

[0032] Figure 2 This is a schematic diagram of the exploded structure of a reflective module in the prior art;

[0033] Figure 3 This is one of the structural schematic diagrams of the reflection module provided in the embodiments of this application;

[0034] Figure 4 An exploded structural diagram of the reflective module provided in this application;

[0035] Figure 5 This is a schematic diagram of the structure of the motor carrier provided in the embodiments of this application;

[0036] Figure 6 This is a schematic diagram of the structure of the mounting bracket provided in the embodiments of this application;

[0037] Figure 7 This is the second schematic diagram of the structure of the reflection module provided in the embodiments of this application;

[0038] Figure 8 for Figure 7 A schematic diagram of the cross-sectional structure along the AA direction;

[0039] Figure 9 This is a schematic diagram of the structure of the mounting bracket and motor carrier provided in the embodiments of this application;

[0040] Figure 10 for Figure 9 A schematic diagram of the cross-sectional structure along the BB direction.

[0041] Explanation of reference numerals in the attached figures:

[0042] a-Light reflector; b-Motor bracket; c-Lens; d-Lens bracket; 100-Reflection module; 11-First lens; 12-Light reflecting element; 13-Second lens; 2-Mounting bracket; 21-Connecting part; 22-First mounting part; 221-First mounting hole; 222-First mounting groove; 3-Motor carrier; 31-Opening; 32-First sidewall; 33-Bearing groove; 34-Mounting surface; 35-Second mounting part; 351-Second mounting hole; 352-Second mounting groove; 4-Indicator mark. Detailed Implementation

[0043] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0044] In this application, the terms "upper," "lower," "top," "bottom," "inner," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0045] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0046] Furthermore, the terms "set up," "equipped with," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0047] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0048] With the trend towards thinner and lighter mobile devices and higher performance in photography, optical imaging modules are increasingly moving towards miniaturization and higher pixel counts. To achieve long focal lengths within limited space, the industry commonly employs a periscope structure, which uses light-reflecting elements to deflect the incident light path, thereby extending the optical path length in the vertical space. In a periscope structure, the assembly precision of the light-reflecting elements and subsequent lens groups affects the optical axis alignment and image quality.

[0049] Please see Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of a reflection module in the prior art; Figure 2 This is an exploded view of a reflective module in the prior art. A reflective module typically includes a light reflector a (such as a mirror or right-angle prism) for changing the optical path and its supporting structure (such as a motor bracket b). The assembly accuracy of the reflective module determines the collimation of the imaging optical path. In mainstream manufacturing processes, the light reflector a is first fixed to the motor bracket b to establish an initial optical path reference. Subsequently, the subsequent lens group c (usually including multiple lenses c) needs to be indirectly mounted to the motor bracket b, which already houses the light reflector a, via a separate lens bracket d. Specifically, one lens c is first installed and fixed in the lens bracket d, which is then assembled as a single unit onto the motor bracket b already supporting the light reflector a. Finally, another lens c is actively aligned and compensated for on this semi-finished product to correct all accumulated deviations in the preceding optical elements.

[0050] This multi-stage assembly method results in a lengthy tolerance chain. This chain includes: the assembly tolerance between the first-installed lens c and the lens holder d; the manufacturing tolerance of the lens holder d itself; the assembly tolerance between the lens holder d and the motor holder b; the manufacturing tolerance of the motor holder b itself; and the assembly tolerance between the light reflector a and the motor holder b. All these tolerances are sequentially connected and amplified along the optical path, ultimately resulting in a significant overall spatial deviation between the optical center of the first-installed lens c and the optical reference plane established by the reflector. This not only makes the subsequently installed lens c prone to yield reduction due to insufficient compensation capability, but more seriously, even if the optical axis is aligned through self-alignment, the accumulation of tolerances across multiple stages can easily introduce unnecessary tilting and eccentricity, limiting the resolution and imaging quality of the camera module.

[0051] Based on this, this application discloses a reflection module and a camera module, which realizes the integrated positioning of the light reflection element and the lens, and avoids the adverse effects of the accumulation of multi-level assembly tolerances on the imaging quality of the reflection module.

[0052] The technical solution of this application will be further described below with reference to the embodiments and accompanying drawings.

[0053] Please see Figure 3 and Figure 4 , Figure 3 This is one of the structural schematic diagrams of the reflection module 100 provided in the embodiments of this application; Figure 4 This is an exploded structural diagram of the reflective module 100 provided in this application. The first aspect of this application discloses a reflection module 100, which includes: an optical path assembly including a first lens 11, a light reflecting element 12, and a second lens 13; a mounting bracket 2 configured to support the first lens 11; and a motor carrier 3 configured to carry the light reflecting element 12 and the second lens 13 and drive the light reflecting element 12 and the second lens 13 to move. The motor carrier 3 forms a receiving cavity with an opening 31 and has a first sidewall 32. The opening 31 and the first sidewall 32 are located on different sides of the receiving cavity. The light reflecting element 12 is disposed in the receiving cavity, and the second lens 13 is disposed on the first sidewall 32. The first sidewall 32 and the opening 31 are respectively located on the light emitting side and the light entering side of the light reflecting element 12. The mounting bracket 2 is disposed in the opening 31, and the optical axis of the second lens 13 intersects the optical axis of the first lens 11. The light reflecting element 12 is configured to reflect the light incident from the first lens 11 to the second lens 13.

[0054] The optical path assembly includes a first lens 11, a light-reflecting element 12, and a second lens 13, which together constitute the core imaging optical path. The first lens 11, as the incident lens, is responsible for receiving external light and completing initial convergence. The light-reflecting element 12 is used to deflect the light path. The second lens 13 receives the reflected light and continues to transmit it to subsequent imaging components. By achieving optical path folding within a limited space, the optical path assembly shortens the physical size of the reflection module 100, supporting the thinning and lightening of the camera module.

[0055] Alternatively, the light reflecting element 12 can be a reflector. Reflectors are low-cost, easy to install, and suitable for applications where high precision is not required. The light reflecting element 12 can also be a right-angle prism. Right-angle prisms have a stable structure and a fixed reflecting surface, making them less prone to displacement and suitable for systems that require maintaining accurate angles over a long period.

[0056] Mounting bracket 2 is configured to support the first lens 11. Its function is to provide a stable mounting reference for the first lens 11 at the incident end and to move the first lens 11. Motor carrier 3 is configured to carry the light reflecting element 12 and the second lens 13, and to move the light reflecting element 12 and the second lens 13 together. Motor carrier 3 forms a receiving cavity with an opening 31. Mounting bracket 2 is positioned at opening 31, allowing for smooth transmission of the incident light path between the first lens 11 and the light reflecting element 12. Simultaneously, the positioning of mounting bracket 2 at opening 31 also ensures the synchronous movement of mounting bracket 2 and motor carrier 3.

[0057] Furthermore, the mounting bracket 2 is positioned at the opening 31 of the motor carrier 3, allowing the optical axis of the first lens 11 to be directly aligned with the light reflecting element 12. The optical axis of the second lens 13 intersects with the optical axis of the first lens 11 after reflection, forming a complete and accurate optical path bend.

[0058] Optionally, the mounting bracket 2 and the first lens 11 can be configured as an integrated structure. When centering the first lens 11, only the position of the mounting bracket 2 relative to the motor carrier 3 needs to be adjusted to achieve the position of the first lens 11 relative to the light reflecting element 12.

[0059] The light-reflecting element 12 is housed within the receiving cavity of the motor carrier 3, avoiding interference from external stray light and physical collision damage. The opening 31 of the receiving cavity is located on the light-inlet side of the light-reflecting element 12, facilitating the reception of incident light; while the first sidewall 32 is located on the light-outlet side, used for mounting the second lens 13. This arrangement allows the light-reflecting element 12 and the second lens 13 to be mounted on the same motor carrier 3, eliminating the problem of overlapping tolerances of multiple parts caused by separate mounting in traditional architectures.

[0060] Optionally, the light reflector 12 is disposed in the receiving cavity, and the light reflector 12 and the motor carrier 3 can be bonded together with ultraviolet light curing adhesive. The curing shrinkage in the limited dispensing area will not cause deformation to the core optical area of ​​the light reflector 12.

[0061] During use, light first enters through the first lens 11, then through the opening 31 of the mounting bracket 2 into the receiving cavity. After reaching the surface of the light reflecting element 12, it is reflected towards the first sidewall 32, passes through the second lens 13 mounted on the first sidewall 32, and exits into subsequent lens groups or sensors. When focusing or optical image stabilization is required, the motor carrier 3 moves the light reflecting element 12 and the second lens 13 it carries together. Since the two are fixed to the same carrier and there is no relative displacement between them, no additional optical deviation is introduced, ensuring the stability of image quality during movement.

[0062] Thus, the reflection module 100 provided in this application integrates the light reflecting element 12 and the second lens 13 onto the same motor carrier 3, and the first lens 11 is disposed on the mounting bracket 2. This shortens the assembly tolerance chain between the light reflecting element 12 and the second lens 13. The first path is the positioning tolerance of the light reflecting element 12 relative to the motor carrier 3, and the second path is the positioning tolerance of the second lens 13 relative to the motor carrier 3. This improves the relative positional accuracy between the reflecting surface of the light reflecting element 12 and the optical axis of the second lens 13, reduces the difficulty and requirement of centering compensation of the first lens 11, and helps to improve the yield and consistency of the reflection module 100.

[0063] In some embodiments, the first lens 11 has at least one convex surface to give it positive optical power, and is configured to converge light rays. Through its positive optical power and light-converging function, the first lens 11 converges the light beam in the initial stage of entering the reflection module 100. This convergence reduces the beam diameter entering the subsequent optical path, allowing the beam to pass more efficiently through the opening 31 on the motor carrier 3 and more concentratedly illuminate the effective area of ​​the light-reflecting element 12, thus improving the efficiency of light energy utilization and laying the foundation for higher relative illumination in the reflection module 100.

[0064] Furthermore, the pre-convergence of light by the first lens 11 reduces the optical power burden on the subsequent second lens 13. After the light beam is converged by the first lens 11, it is deflected by the light reflecting element 12 and guided to the second lens 13. This allows the second lens 13 to focus more on functions such as aberration correction and image plane flattening, rather than undertaking too much responsibility for beam convergence. This helps to optimize the overall aberration balance of the system and improve the sharpness and edge quality of the final image.

[0065] In some embodiments, the second lens 13 has at least one concave surface to give it negative optical power, and is configured to expand the light beam. In the optical path design, the light beam, after being converged by the first lens 11 and deflected by the light reflecting element 12, has a high degree of convergence and a small beam diameter. The negative optical power of the second lens 13 serves to moderately expand this convergent beam to adjust its diameter and divergence angle, better matching the incident requirements of subsequent imaging lens groups. This avoids problems such as uneven image illumination or insufficient utilization of the aperture of subsequent lenses that may result from excessive beam concentration.

[0066] The negative optical power of the second lens 13 works in conjunction with the positive optical power of the first lens 11 to form a telecentric or quasi-telecentric optical path structure in the optical system design. This combination of positive and negative optical power helps to smooth out the angle of light rays and reduce the principal ray angle, thereby reducing the sensitivity of the image sensor to the angle of incident light rays and improving color consistency and relative illumination.

[0067] Please see Figure 5 and Figure 6 , Figure 5 This is a schematic diagram of the structure of the motor carrier 3 provided in the embodiments of this application. Figure 6 This is a schematic diagram of the structure of the mounting bracket 2 provided in an embodiment of this application. In some embodiments, the motor carrier 3 further has a bearing groove 33, which is disposed at the edge of the opening 31 of the motor carrier 3 and is configured to support the mounting bracket 2. The mounting bracket 2 includes a connecting portion 21, which is disposed on the side of the mounting bracket 2. The surface of the connecting portion 21 facing the motor carrier 3 is configured to abut against the bottom of the bearing groove 33 so that the mounting bracket 2 is connected to the motor carrier 3.

[0068] The support groove 33 structure provides a clear installation position for the mounting bracket 2. The connecting part 21 of the mounting bracket 2 abuts against the bottom of the support groove 33. The groove wall constrains the movement of the mounting bracket 2 within the bottom surface of the support groove 33, limiting the displacement of the mounting bracket 2 relative to the motor carrier 3. This positioning method based on mechanical contact improves the repeatability and consistency of the optical axis position of the first lens 11, ensuring the accuracy of the incident light path between the first lens 11 and the light reflecting element 12.

[0069] From an assembly process perspective, the design of the fit between the bearing groove 33 and the connecting part 21 facilitates automated assembly. The mounting bracket 2 can be easily inserted into the bearing groove 33 through a simple pick-and-place operation, simplifying complex steps such as focusing or shim adjustment, which helps to improve production efficiency and reduce manufacturing costs.

[0070] Please see Figure 5 and Figure 6 In some embodiments, there are multiple connecting portions 21 and multiple bearing grooves 33. Multiple connecting portions 21 are spaced apart circumferentially along the mounting bracket 2, and multiple bearing grooves 33 are spaced apart circumferentially along the opening 31. This circumferentially spaced arrangement of multiple connecting portions 21 and multiple bearing grooves 33 achieves uniform force distribution and support at multiple points between the mounting bracket 2 and the motor carrier 3. The multiple connecting portions 21 and multiple bearing grooves 33 disperse connection stress and potential external impact loads to multiple independent contact points, avoiding excessive stress concentration in localized areas. This reduces the risk of deformation or cracking of the mounting bracket 2 or motor carrier 3 due to long-term stress concentration, thereby improving the structural reliability and long-term durability of the reflective module 100.

[0071] Furthermore, the cooperation of multiple circumferentially spaced connecting parts 21 with the bearing groove 33 constitutes a circumferentially distributed constraint system, which can more effectively resist the slight rotation or tilt of the mounting bracket 2 relative to the motor carrier 3 in various directions, especially providing stronger constraint on the torsional degree of freedom around the optical axis. This enhanced constraint capability ensures that after assembly, the mounting bracket 2 and the first lens 11 it supports can resist the effects of environmental vibration and temperature changes, maintain the accuracy and stability of the optical center and optical axis, and thus guarantee the long-term consistency of the relative position of the incident light path and the light reflecting element 12.

[0072] Please see Figure 3 In some embodiments, there is a gap between the sidewall of the bearing groove 33 and the sidewall of the connecting portion 21, and there is a gap between the sidewall of the mounting bracket 2 and the inner sidewall of the opening 31.

[0073] From a tolerance adaptability perspective, the spacing design effectively absorbs unavoidable dimensional deviations in component manufacturing. The machining tolerances of the opening 31 of the motor carrier 3, the manufacturing tolerances of the outer contour of the mounting bracket 2, and the relative positional tolerances between the multiple connecting parts 21 and the multiple bearing grooves 33 can all be accommodated by the spacing between the sidewalls. This means that even if the size of a single part is at the limit of its tolerance zone, it will not cause assembly interference or jamming between the mounting bracket 2 and the motor carrier 3, improving the interchangeability of parts and the assembly yield, and reducing the screening or scrap costs caused by accumulated tolerances in the dimensional chain.

[0074] Furthermore, the spacing allows for precise positional adjustment of the mounting bracket 2 and the first lens 11 supported by the mounting bracket 2 before the reflective module 100 is finally secured. During assembly, operators or automated equipment can use an external self-aligning device to push the mounting bracket 2, causing the connecting part 21 of the mounting bracket 2 to translate within the plane of the bearing groove 33, thereby adjusting the position of the optical center of the first lens 11 and ensuring that the optical axis of the first lens 11 is optimally aligned with the incident surface of the light reflecting element 12.

[0075] Optionally, after alignment, the final fixation of the mounting bracket 2 can be achieved using UV-cured adhesive. The operator can apply the adhesive in dots between the connecting part 21 and the side wall of the bearing groove 33, or between the side wall of the mounting bracket 2 and the inner side wall of the opening 31. While in liquid state, the adhesive allows for final fine-tuning; after curing, it firmly locks the relative position between the mounting bracket 2 and the motor carrier 3, forming a high-strength, permanent connection.

[0076] Please see Figures 7 to 10 , Figure 7 This is a second schematic diagram of the structure of the reflection module 100 provided in the embodiments of this application; Figure 8 for Figure 7 A schematic diagram of the cross-sectional structure along the AA direction; Figure 9 This is a schematic diagram of the structure of the mounting bracket 2 and the motor carrier 3 provided in the embodiments of this application; Figure 10 for Figure 9 A cross-sectional view along the BB direction is shown in the diagram. In some embodiments, the mounting bracket 2 has a first mounting portion 22, which has a first mounting hole 221. The first mounting portion 22 is used to mount the first lens 11. The first mounting hole 221 extends through the first mounting portion 22 along the optical axis of the first lens 11. The edge of the first end face of the first mounting hole 221 is recessed toward the second end face to form a first mounting groove 222 around the periphery of the first mounting hole 221. The surface of the first mounting groove 222 facing away from the receiving cavity is configured to abut against the bottom surface of the first lens 11. The sidewall of the first mounting groove 222 abuts against the lateral peripheral surface of the first lens 11.

[0077] The first mounting groove 222 provides positioning and support space for the first lens 11. The surface of the first mounting groove 222 facing away from the receiving cavity serves as a reference surface, contacting the bottom surface of the first lens 11, thereby determining the position of the first lens 11 in the optical axis direction and ensuring the accuracy of the focal length of the optical system. The sidewall of the first mounting groove 222 serves as a radial reference surface, closely fitting with the side circumferential surface of the first lens 11, constraining the movement of the first lens 11 in the plane perpendicular to the optical axis, ensuring the coincidence of the optical center and mechanical axis of the first lens 11, and reducing the eccentricity and tilt of the first lens 11.

[0078] It is understood that the first lens 11 can complete the initial and precise pre-positioning through the bottom surface and side wall of the first mounting groove 222, thereby eliminating the risk of lens surface shape changes or positional disturbances caused by shrinkage stress during the adhesive curing process.

[0079] In addition, the first mounting groove 222 forms a wrap-around support for the first lens 11, increasing the contact area and enabling the first lens 11 to more evenly transfer its own weight and possible external impact loads to the overall structure of the mounting bracket 2, thereby improving the rigidity and vibration and impact resistance of the component and ensuring the stability of optical parameters under harsh operating conditions.

[0080] Please see Figure 8 In some embodiments, the motor carrier 3 has a mounting surface 34 and a second mounting portion 35. The mounting surface 34 is located on the bottom surface of the motor carrier 3 so that a receiving cavity is formed above the mounting surface 34. The mounting surface 34 is used to support the light reflecting element 12. The second mounting portion 35 is disposed on the first side wall 32. The second mounting portion 35 and the mounting surface 34 are disposed opposite to each other along the direction of the optical axis of the second lens 13. The second mounting portion 35 is used to mount the second lens 13.

[0081] Mounting surface 34 provides a bearing reference for the light reflector 12. This surface contact support method enhances the mounting rigidity and stability of the light reflector 12 on the motor carrier 3, preventing displacement or angular deflection of the light reflector 12 when subjected to external forces or vibrations, thereby ensuring the long-term accuracy and consistency of the reflection angle of the light reflector 12. The mounting surface 34 is located at the bottom of the receiving cavity, thus surrounding and protecting the light reflector 12, reducing the risk of external interference and damage.

[0082] The second mounting part 35 is disposed on the first side wall 32 and is spatially opposite to the mounting surface 34 at the bottom along the optical axis of the second lens 13. The purpose is to establish the mounting reference of the second lens 13 and the mounting reference of the light reflecting element 12 on the same rigid body, namely the motor carrier 3. Since both the light reflecting element 12 and the second lens 13 are directly fixed to the same motor carrier 3 through the mounting surface 34 and the second mounting part 35, the tolerance accumulation problem caused by the stacking and assembly of multiple parts in the traditional design is avoided.

[0083] Please see Figure 10 In some embodiments, the second mounting portion 35 has a second mounting hole 351 that extends through the second mounting portion 35 along the optical axis of the second lens 13. The edge of the first end face of the second mounting hole 351 is recessed toward the second end face to form a second mounting groove 352 surrounding the periphery of the second mounting hole 351. The surface of the second mounting groove 352 away from the receiving cavity is configured to abut against the bottom surface of the second lens 13, and the sidewall of the second mounting groove 352 abuts against the lateral peripheral surface of the second lens 13.

[0084] The second mounting groove 352 provides positioning and support space for the second lens 13. The surface of the second mounting groove 352 facing away from the receiving cavity serves as a reference surface, contacting the bottom surface of the second lens 13, thereby determining the position of the second lens 13 in the optical axis direction and ensuring the accuracy of the focal length of the optical system. The sidewall of the second mounting groove 352 serves as a radial reference surface, tightly fitting with the lateral circumferential surface of the second lens 13, constraining the movement of the second lens 13 in the plane perpendicular to the optical axis, ensuring the coincidence of the optical center and mechanical axis of the second lens 13, and reducing the eccentricity and tilt of the second lens 13.

[0085] It is understood that the second lens 13 can be preliminarily and accurately positioned by the bottom surface and side wall of the second mounting groove 352, thereby eliminating the risk of lens surface shape changes or positional disturbances caused by shrinkage stress during the adhesive curing process.

[0086] In addition, the second mounting groove 352 forms a wrap-around support for the second lens 13, increasing the contact area and enabling the second lens 13 to more evenly transfer its own weight and possible external impact loads to the overall structure of the mounting bracket 2, thereby improving the rigidity and vibration and impact resistance of the component and ensuring the stability of optical parameters under harsh operating conditions.

[0087] Please see Figure 9 In some embodiments, the surface of the motor carrier 3 with the opening 31 is provided with a plurality of indicator marks 4. The plurality of indicator marks 4 are arranged at intervals along the circumference of the opening 31, and all the indicator marks 4 form a central indicator pattern. The projection of the geometric center of the central indicator pattern along the optical axis of the first lens 11 coincides with the projection of the center of the light reflecting element 12 along the optical axis of the first lens 11.

[0088] The center indicator pattern provides an intuitive and precise visual alignment reference during assembly. Operators or automated vision recognition systems can quickly and accurately determine the projection position of the theoretical center point of the light-reflecting element 12 onto the plane of the opening 31 of the motor carrier 3 using these circumferentially spaced indicator marks 4. The center indicator pattern facilitates the initial placement and coarse adjustment of the mounting bracket 2 and the first lens 11, ensuring that the optical axis of the first lens 11 roughly coincides with the center of the light-reflecting element 12, saving time and reducing operational difficulty for subsequent precision alignment.

[0089] The second aspect of this application discloses a camera module, including: a reflection module 100 of the first aspect of this application; a lens module, the lens module being held on the light reflection path of the reflection module 100; an imaging module, the imaging module receiving light emitted from the lens module to form an image; a base, the base having a placement cavity, the reflection module 100 and the lens module being disposed in the placement cavity; and a housing, the housing covering the base.

[0090] It should be noted that the camera module disclosed in the second aspect of the embodiments of this application includes the reflection module 100 of the first aspect of the embodiments of this application, and can bring the same or similar beneficial effects. For details, please refer to the description in the above embodiments, which will not be repeated here.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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 or all of the technical features therein. 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 application.

Claims

1. A reflection module, characterized in that, The reflection module includes: An optical path assembly, the optical path assembly including a first lens, a light reflecting element, and a second lens; Mounting bracket, configured to support the first lens; A motor carrier is configured to carry the light reflecting element and the second lens, and to move the light reflecting element, the second lens and the mounting bracket. The motor carrier has a receiving cavity with an opening and a first sidewall. The opening and the first sidewall are located on different sides of the receiving cavity. The light reflecting element is disposed in the receiving cavity, and the second lens is disposed on the first sidewall. The first sidewall and the opening are respectively located on the light emitting side and the light entering side of the light reflecting element. The mounting bracket is disposed in the opening, and the optical axis of the second lens intersects the optical axis of the first lens. The light reflecting element is configured to reflect the light incident from the first lens to the second lens.

2. The reflection module according to claim 1, characterized in that, The first lens has at least one convex surface to give it positive optical power, and is configured to converge light rays; and / or, The second lens has at least one concave surface to give it negative optical power, and is configured to expand the beam of light.

3. The reflection module according to claim 1, characterized in that, The motor carrier also has a support groove, which is disposed at the edge of the opening of the motor carrier and is configured to support the mounting bracket; The mounting bracket includes a connecting portion disposed on the side of the mounting bracket. The surface of the connecting portion facing the motor carrier is configured to abut against the bottom of the bearing groove, so that the mounting bracket is connected to the motor carrier.

4. The reflection module according to claim 3, characterized in that, The number of connecting parts and the number of bearing grooves are both multiple. The multiple connecting parts are arranged at intervals along the circumference of the mounting bracket, and the multiple bearing grooves are arranged at intervals along the circumference of the opening.

5. The reflection module according to claim 3, characterized in that, There is a gap between the sidewall of the bearing groove and the sidewall of the connecting part, and there is a gap between the sidewall of the mounting bracket and the inner sidewall of the opening.

6. The reflection module according to any one of claims 1-5, characterized in that, The mounting bracket has a first mounting portion with a first mounting hole. The first mounting portion is used to mount the first lens. The first mounting hole extends through the first mounting portion along the optical axis of the first lens. The edge of the first end face of the first mounting hole is recessed toward the second end face to form a first mounting groove around the periphery of the first mounting hole. The surface of the first mounting groove away from the receiving cavity is configured to abut against the bottom surface of the first lens. The sidewall of the first mounting groove abuts against the lateral circumferential surface of the first lens.

7. The reflection module according to any one of claims 1-5, characterized in that, The motor carrier has a mounting surface and a second mounting portion. The mounting surface is located on the bottom surface of the motor carrier so that the receiving cavity is formed above the mounting surface. The mounting surface is used to support the light reflecting element. The second mounting portion is disposed on the first side wall. The second mounting portion and the mounting surface are disposed opposite to each other along the direction of the optical axis of the second lens. The second mounting portion is used to mount the second lens.

8. The reflection module according to claim 7, characterized in that, The second mounting portion has a second mounting hole that extends through the second mounting portion along the direction of the optical axis of the second lens. The edge of the first end face of the second mounting hole is recessed toward the second end face to form a second mounting groove around the periphery of the second mounting hole. The surface of the second mounting groove away from the receiving cavity is configured to abut against the bottom surface of the second lens, and the sidewall of the second mounting groove abuts against the lateral circumferential surface of the second lens.

9. The reflection module according to any one of claims 1-5, characterized in that, The motor carrier has a plurality of indicator marks on the surface of the opening. The plurality of indicator marks are spaced apart circumferentially along the opening, and all the indicator marks form a central indicator pattern. The projection of the geometric center of the central indicator pattern along the optical axis of the first lens coincides with the projection of the center of the light reflecting element along the optical axis of the first lens.

10. A camera module, characterized in that, include: The reflection module as described in any one of claims 1-9; A lens module, wherein the lens module is positioned on the light reflection path of the reflective module; An imaging module, configured to receive light emitted from the lens module for imaging; A base having a placement cavity, wherein the reflection module and the lens module are disposed within the placement cavity; as well as A housing, which is fitted over the base.

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