A lens module and electronic device

Abstract

This application discloses a lens module and electronic device, including a carrier, an optical element, a limiter, and an adhesive. The carrier is suitable for accommodating the optical element. The limiter includes a support member, and a pre-compression part is provided on the side of the support member near the optical element. The minimum frictional force between the pre-compression part and the optical element is not less than the weight of the optical element. The limiter is suitable for connecting with the carrier and pressing the optical element onto the carrier. At least one adhesive surface is provided around the limiter. The adhesive is suitable for being disposed between the adhesive surface and the carrier. The elastic modulus of the pre-compression part is less than the elastic modulus of the support member and less than the elastic modulus of the optical element. This application has the characteristic of structural stability. Through the flexible connection of the pre-compression part, the transmission of force to the optical element during the use of the lens module can be weakened, reducing the probability of damage to the optical element.

Description

Technical Field

[0001] This application relates to the field of optical imaging equipment technology, specifically to a lens module and electronic device. Background Technology

[0002] High-magnification optical zoom has always been a development trend in smartphone photography. However, due to the trend of smartphones becoming thinner and lighter, traditional lens module structures cannot meet the requirements of high-magnification optical zoom. Therefore, periscope lenses have come to the stage of mobile phone cameras, making long-distance zoom possible. Existing periscope camera modules usually have optical image stabilization (OIS) to improve image quality and enhance the user's photography experience. Generally speaking, periscope camera modules use prisms or reflective surfaces to provide a bending effect on the light path. This allows the linear light path design to bend to 90 degrees using mirrors or prisms, thereby converting the thickness of the lens into length, achieving a longer focal length, and also changing the structure of the camera module.

[0003] However, existing lens modules have the following drawbacks: In periscope camera modules, the reflector is usually directly fixed to the moving parts of the motor with glue. When the glue is cured, the assembled whole needs to be heated and cured. During the heating process, due to the different materials of the reflector and the supporting reflector, the difference in the coefficient of thermal expansion of the materials often causes structural interference problems caused by thermal expansion of the reflector and the supporting reflector, resulting in reflector deformation. When the temperature returns to room temperature from the glue curing temperature, the structure of the reflector and the supporting reflector will also generate shrinkage stress due to the different rates of dimensional expansion and contraction during cooling. The shrinkage stress may further aggravate the deformation of the reflector, or maintain the deformed shape, making it difficult for the structure to return to the state before the first heating.

[0004] Furthermore, when voice coil motors or SMA shape memory alloys are working, they need to be energized. The coils generate heat when energized, and this heat can be transferred to the moving parts. SMA shape memory alloys work on a similar principle. All of these factors cause thermal expansion and contraction effects on the moving parts and the mirrors on them. Since the mirrors and moving parts are made of different materials, their degrees of thermal expansion and contraction differ when the temperature changes, generating stress. This can easily cause the mirrors to deform, reducing their surface accuracy and affecting their optical performance, resulting in unsatisfactory image capture results from the camera module. Summary of the Invention

[0005] One objective of this application is to provide a structurally stable lens module and electronic device.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows: a lens module, including a carrier, an optical element, a limiter, and an adhesive. The carrier is adapted to accommodate the optical element. The limiter includes a support member. A pre-compression portion is provided on the side of the support member near the optical element. The minimum frictional force between the pre-compression portion and the optical element is not less than the weight of the optical element. The limiter is adapted to connect with the carrier and press the optical element onto the carrier. At least one adhesive surface is provided around the limiter. The adhesive is adapted to be disposed between the adhesive surface and the carrier. The elastic modulus of the pre-compression portion is less than the elastic modulus of the support member, and the elastic modulus of the pre-compression portion is less than the elastic modulus of the optical element.

[0007] In some embodiments, the support member has an extrusion section on the side away from the optical element, the elastic modulus of the extrusion section is less than the elastic modulus of the support member, and the elastic modulus of the extrusion section is less than the elastic modulus of the optical element. The pre-compression section is adapted to deform to uniformly distribute the force between the support member and the mounting device.

[0008] In some embodiments, the support member has a positioning channel, and the pre-compression part and the extrusion part are connected to each other through the positioning channel; the surface area of ​​the pre-compression part and the surface area of ​​the extrusion part are the same.

[0009] In some embodiments, the maximum pressure applied by the pre-compression portion to the optical element is less than the minimum stress that causes elastic deformation of the optical element.

[0010] In some embodiments, the deformation generated when the pre-compression part abuts against the optical element is not less than the maximum deformation generated when the pre-compression part overcomes gravity.

[0011] In some embodiments, the surface of the optical element is provided with a pre-pressure region, the coefficient of friction of the optical element in the pre-pressure region is greater than the coefficient of friction of the region outside the pre-pressure region, and the pre-pressure portion is adapted to engage with the pre-pressure region.

[0012] In some embodiments, the surface friction coefficient of the pre-compression portion is 0.3 to 0.7, and the friction coefficient of the pre-compression zone is 0.1 to 0.3.

[0013] In some embodiments, the limiter is provided with an extension on the side near the support, the extension being adapted to engage with the adhesive surface to increase the adhesive area of ​​the adhesive surface.

[0014] In some embodiments, the extension has at least one extension end and at least one notch formed on the side near the optical element, the extension end being adapted to engage with the carrier, and the notch being adapted to engage with the carrier; the carrier is provided with an engagement groove, and when the limiter is connected to the carrier and abuts against the optical element, the engagement groove is adapted to accommodate the extension and restrict the extension from disengaging at least in a direction perpendicular to the adhesive surface where the extension is joined.

[0015] An electronic device comprising any of the lens modules described above.

[0016] Compared with the prior art, the beneficial effects of this application are as follows: By setting the pre-compression part to be flexible and configuring the relationship between the elastic modulus of the pre-compression part, the support member, and the optical element, the lens module and electronic device of this application ensure that the support member provides stable support for the optical element. At the same time, when forces are generated between the various components of the lens module, the pre-compression part can deform before the support member and the optical element, thereby weakening the transmission of the force from the support member to the optical element and reducing the occurrence of phenomena such as the support member damaging the reflector. This improves the installation stability and usage stability of the entire lens module. Attached Figure Description

[0017] Figure 1 This is an overall structural view according to a preferred embodiment of the present application.

[0018] Figure 2 This is an oblique view according to a preferred embodiment of the present application.

[0019] Figure 3 This is a contact diagram of the limiter and optical element according to a preferred embodiment of this application.

[0020] Figure 4 This is a schematic diagram of a combination of a limiter and an optical element according to a preferred embodiment of this application.

[0021] Figure 5 This is a cross-sectional view along the AA direction in Figure 2, according to a preferred embodiment of this application.

[0022] Figure 6 This is a perspective view of a preferred embodiment of the present application.

[0023] Figure 7 This is a top view according to a preferred embodiment of the present application.

[0024] Figure 8 This is a schematic diagram showing the connection between the limiter and the support according to a preferred embodiment of this application.

[0025] Figure 9This is a schematic diagram of the fit between the limiter and the bearing seat according to a preferred embodiment of this application.

[0026] Figure 10 This is a schematic diagram of the fit between the limiter and the support seat according to a preferred embodiment of this application.

[0027] Figure 11 This is a schematic diagram of the fit between the limiter and the support seat according to a preferred embodiment of this application.

[0028] Figure 12 This is a schematic diagram of the engagement of an optical element and a carrier according to a preferred embodiment of this application.

[0029] Figure 13 This is a schematic diagram of the overall structure after combining a preferred embodiment of the present application with a lens.

[0030] In the diagram: 1. Bearing seat; 11. Engaging groove; 12. Positioning part; 13. Bearing edge; 14. Alignment slot; 15. Notch; 16. Support piece; 2. Optical element; 21. Pre-compression area; 3. Limiter; 31. Support member; 311. Positioning channel; 32. Pre-compression part; 33. Extrusion part; 34. Extension part; 341. Extension end; 342. Notch; 35. First positioning end; 351. Hinge interface; 352. Fitting edge; 353. First bending section; 354. Second bending section; 36. Second positioning end; 361. Insertion edge; 362. Third bending section; 363. Fourth bending section; 4. Adhesive. Detailed Implementation

[0031] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0032] In the description of this application, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this application.

[0033] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0034] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0035] The following description, in conjunction with the accompanying drawings, further illustrates this application:

[0036] like Figures 1 to 13 As shown, this application provides a lens module, including a carrier 1, an optical element 2, a limiter 3, and an adhesive 4. The carrier 1 is adapted to accommodate the optical element 2, and the limiter 3 is adapted to connect to the carrier 1 and limit the optical element 2 on the carrier 1. At least one adhesive surface is provided around the limiter 3. The adhesive 4 is adapted to be disposed between the adhesive surface and the carrier 1. The main expansion and contraction direction of the adhesive 4 between the adhesive surface and the carrier 1 is parallel to the contact surface between the optical element 2 and the limiter 3. The adhesive 4 is adapted to at least maintain the contact fit between the limiter 3 and the optical element 2. The adhesive 4 enables the carrier 1, the optical element 2, and the limiter 3 assembled together to maintain relative stability and reduce the occurrence of relative movement.

[0037] In this application, the mounting direction of the optical element 2 into the carrier 1 and the mounting direction of the limiter 3 connected to the carrier 1 are both from the same side of the carrier 1. The carrier 1 is used on the other sides to restrict the movement of the optical element 2 and the limiter 3, so as to improve the structural stability after assembly.

[0038] In some embodiments, the size of the limiter 3 is larger than the size of the optical element 2, and part of the structure of the limiter 3 can be connected to the support 1 on the outside of the optical element 2, while the optical element 2 can be completely supported by the limiter 3.

[0039] In some embodiments, the main body shape of the surface of the optical element 2 is rectangular, and the limiter 3 is adapted to be symmetrically arranged on both sides of the optical element 2 and adapted to limit the shorter side of the optical element 2, which can reduce the impact on the imaging of the optical element 2 and make the optical element 2 more uniformly stressed.

[0040] Since the adhesive 4 shrinks during the cooling process after curing, and the shrinkage rate of the adhesive 4 is consistent throughout the process, the shrinkage of the adhesive 4 will be greater in the direction where the total amount of adhesive 4 used is larger. The same applies when the adhesive 4 expands due to heat. Therefore, the main shrinkage and expansion direction of the adhesive 4 between the bonding surface and the support 1 can also be understood as the shrinkage and expansion direction in which the amount of shrinkage (expansion) of the adhesive 4 is the largest in a single bonding surface. The shrinkage (expansion) of the adhesive 4 in this shrinkage and expansion direction is greater than the shrinkage (expansion) of the adhesive 4 in other shrinkage and expansion directions.

[0041] In some embodiments, the bonding surface is planar, and the contact surface between the adhesive 4 and the carrier 1 is planar, which reduces the torsional force on the bonded object when the adhesive 4 is bonding (especially when shrinkage or expansion occurs), and improves the bonding stability.

[0042] like Figure 2 In the embodiment shown, the adhesive 4 between the bonding surface and the carrier 1 is a long strip shape. The amount of expansion and contraction of the adhesive 4 in the length direction (x direction between the extension and the carrier, y direction between the first positioning end and the carrier) is greater than the amount of expansion and contraction in other directions (width, height). Therefore, when the adhesive 4 expands and contracts, the stress in the length direction (x direction between the extension and the carrier, y direction between the first positioning end and the carrier) is greater than the stress in other directions (width, height).

[0043] As can be seen from the above, by setting the main expansion and contraction direction parallel to the contact surface between the optical element 2 and the limiter 3, the maximum curing stress generated between the limiter 3 and the support 1 is parallel to the contact surface between the optical element 2 and the limiter 3. The deformation and displacement of the limiter 3 under the influence of this maximum curing stress can be effectively reduced when it is transmitted to the optical element 2, thereby reducing the pulling and pressing of the limiter 3 on the optical element 2. Ultimately, the overall impact of the limiter 3 on the optical element 2 caused by the shrinkage and expansion of the adhesive 4 can be reduced, thereby improving the stability and assembly accuracy of the optical element 2.

[0044] The main expansion and contraction direction can also be understood as follows: when the adhesive is placed between the adhesive surface and the carrier, the two sides of the adhesive that are furthest apart form the direction of the maximum size. The direction of the maximum size is parallel to the contact surface of the optical element and the limiter. This direction of the maximum size can also be regarded as the main expansion and contraction direction.

[0045] Furthermore, the main expansion and contraction direction can also be understood as follows: when the adhesive is placed between the bonding surface and the bearing seat, the adhesive forms a maximum dimension direction between the two sides furthest apart in a certain plane. This maximum dimension direction can also be regarded as the main expansion and contraction direction. The torque generated by the adhesive in this maximum dimension direction between the hinge point between the limiter and the bearing seat is a non-rotational torque. That is, when the adhesive expands or contracts, the limiter will not twist relative to the bearing seat along the hinge point.

[0046] In some embodiments, adhesive 4 is preferably a low-modulus adhesive, the elastic modulus of which is between 100 MPa and 500 MPa.

[0047] When optical element 2 includes a mirror, since the mirror is thinner than the prism, it is equivalent to a mirror. The mirror has a metal layer inside to provide reflection, and a glass layer on the metal layer to transmit light. However, in this multi-layered structure, the metal layer and the glass layer will also generate stress due to temperature changes because of the different coefficients of thermal expansion. Overall, the mirror is more sensitive to temperature stress and is more likely to warp and deform under the influence of temperature stress. In some extreme cases, the mirror may cause severe local deformation due to unreasonable structural design, which may lead to various optical aberrations.

[0048] like Figure 3 In the embodiment shown, the limiter 3 includes a support member 31. A pre-compression part 32 is provided on the side of the support member 31 near the optical element 2. The elastic modulus of the pre-compression part 32 is less than the elastic modulus of the support member 31 and the elastic modulus of the pre-compression part 32 is less than the elastic modulus of the optical element 2. The pre-compression part 32 is adapted to deform in order to uniformly distribute the force between the support member 31 and the optical element 2.

[0049] The elastic modulus refers to the ability of a material to return to its original shape after being subjected to external force. By setting the elastic modulus relationship between the support member 31, the pre-compression part 32 and the optical element 2, the pre-compression part 32 can deform before the support member 31 when subjected to force, so as to ensure the support and limiting effect of the support member 31, and can deform before the optical element 2, so as to weaken the transmission of force to the optical element 2.

[0050] In some embodiments, the size of the support member 31 is larger than the size of the pre-compression part 32, so that the pre-compression part 32 can fully receive, uniformly transmit and transfer the force between the support member 31 and the optical element 2.

[0051] like Figure 3In the embodiment shown, the pre-pressure part 32 is interference-fitted between the support member 31 and the optical element 2 to provide pre-pressure to the optical element 2. Normally, to ensure stability, the direction of the pre-pressure can be designed so that the fit direction between the support member 31, the pre-pressure part 32 and the optical element 2 is perpendicular to the surface of the optical element 2.

[0052] In some embodiments, the pre-compression portion 32 has sufficient thickness to restrict the support member 31 from contacting the optical element 2, thereby preventing hard contact between the support member 31 and the optical element 2 and protecting the surface of the optical element 2.

[0053] In some embodiments, the pre-compression section 32 is made of silicone material.

[0054] In some embodiments, the minimum frictional force between the pre-pressure part 32 and the optical element 2 is not less than the weight of the optical element 2. The formula for calculating the frictional force f between the pre-pressure part 32 and the optical element 2 is: f = x * k * μ, where x is the elastic expansion and contraction of the pre-pressure part 32, k is the elastic coefficient of the pre-pressure part 32, and μ is the friction coefficient between the pre-pressure part 32 and the optical element 2. This ensures that when the lens module rotates to different directions, there will be no relative sliding between the pre-pressure part 32 and the optical element 2, thereby improving the stability of the optical element 2.

[0055] like Figure 4 In the embodiment shown, a pre-pressure region 21 is provided on the surface of the optical element 2. The coefficient of friction of the optical element 2 in the pre-pressure region 21 is greater than the coefficient of friction of the region outside the pre-pressure region 21. The pre-pressure part 32 is adapted to fit against the pre-pressure region 21. In this application, the pre-pressure region 21 is provided to provide greater friction for the contact between the pre-pressure part 32 and the surface of the optical element 2, so that the optical element 2 can be fixed by the pre-pressure part 32 with greater friction.

[0056] It is understandable that the optical element 2 is pressed into the bearing seat 1 by the limiter 3. The greater the pressure applied by the limiter 3 to the optical element 2, the greater the friction between the optical element 2 and the pre-pressing part 32. This makes the state of the optical element 2 after positioning more stable and less prone to displacement, thus improving reliability. The installation method of using the pre-pressing part 32 for pre-pressing, as a non-material curing method, can effectively eliminate various stresses generated by fixing the optical element 2. In the prior art, when glue is used for fixing, the curing of the glue material will generate shrinkage stress. The thermal expansion coefficient of the glue material is also different from that of other parts, which will further increase the possibility of deformation when heated.

[0057] In some embodiments, the area of ​​the pre-compression zone 21 is not less than the contact area between the pre-compression part 32 and the optical element 2, ensuring that the pre-compression part 32 can make flat contact with the surface of the optical element 2, so that the force transmission is more uniform and the probability of deformation of the optical element 2 is reduced.

[0058] In some embodiments, the surface friction coefficient of the pre-compression portion 32 is 0.3 to 0.7, and the friction coefficient of the pre-compression region 21 is 0.1 to 0.3. From a micromechanical perspective, the friction coefficient of the pre-compression portion 32 of this application is 2 to 5 times greater than the friction coefficient of the surface of the optical element 2. After verification, it can prevent the optical element 2 with a glass substrate and a silver plating layer from undergoing stress deformation in a high-temperature environment. Since the surface of the optical element 2 may be in various positions, such as inverted or sideways, the weight applied to the pre-compression portion 32 may change, causing the pre-compression portion 32 to be further compressed or stretched. In other words, the pressure may decrease. Therefore, in order to ensure relative friction, the pre-compression portion 32 and the optical element 2 can make relatively close contact within a range of 2 to 5 times. When the adhesive shrinks, the pre-compression portion 32 can also always maintain the position of the optical element 2.

[0059] In some embodiments, the maximum pressure applied by the pre-pressure section 32 to the optical element 2 is less than the minimum stress required for the optical element 2 to undergo elastic deformation. The formula for calculating the pressure P applied by the pre-pressure section 32 to the optical element 2 is: f = x * k * s, where x is the elastic expansion and contraction of the pre-pressure section 32, k is the elastic coefficient of the pre-pressure section 32, and s is the contact area between the pre-pressure section 32 and the optical element 2. It can also be understood that the pressure applied by the pre-pressure section 32 to the optical element 2 is less than the force required for the optical element 2 to undergo most of the deformation. By controlling the pressure applied by the pre-pressure section 32 to the optical element 2, it is ensured that the surface of the optical element 2 will not deform under various conditions of the lens module, or in other words, there will be no deformation that affects the normal use of the optical element 2, thereby improving the stability of the optical element 2.

[0060] In some embodiments, the deformation generated when the pre-compression part 32 abuts against the optical element 2 is not less than the maximum deformation generated when the pre-compression part 32 overcomes gravity.

[0061] In some embodiments, the compression depth of the pre-compression part 32 is at least 5% to 40% of the material thickness of the pre-compression part 32 when it is not assembled, and the deformation of the pre-compression part 32 against its own gravity is <5%. Within the above compression range, it is sufficient to ensure that the pre-compression part 32 will not fail due to the influence of gravity in various states and postures of the lens module. For example, if the pre-compression part 32 is rotated 180 degrees from above the optical element 2 to below the optical element 2, since it is opposite to the initial position of assembly, the pre-compression part 32 may deform to a greater extent in the opposite direction of the optical element 2 under the influence of gravity to resist the original compression deformation of the pre-compression part 32, thereby causing the pre-compression part 32 to return to its original state, resulting in loosening between the optical element 2 and the pre-compression part 32, thereby causing the position of the optical element 2 to shift, thus affecting the optical imaging of the lens module. In addition, by setting an upper limit for the compression depth of the pre-compression part 32, it is used to avoid excessive deformation of the compression part causing hard contact between the limiter 3 and the optical element 2.

[0062] In some embodiments, the support member 31 is provided with an extrusion section 33 on the side away from the optical element 2. The elastic modulus of the extrusion section 33 is less than that of the support member 31 and the optical element 2. The pre-pressing section 32 is adapted to deform to uniformly distribute the force between the support member 31 and the mounting device. The support member 31 usually needs to be pre-pressed onto the optical element 2 by an external mounting device. The mounting device can provide extrusion pressure to the extrusion section 33. The extrusion pressure provided by the mounting device can deform the extrusion section 33. The extrusion section 33 can use its own deformation to uniformly distribute the extrusion pressure of the mounting device. The extrusion section 33 and the support member 31 are fixedly connected. The uniform force can be transmitted to the support member 31. Through the transmission and uniform pressure of the support member 31 and the pre-pressing section 32, the probability of damage to the optical element 2 is reduced.

[0063] In some embodiments, the size of the support member 31 is larger than the size of the extrusion section 33, so that the extrusion section 33 can fully receive, uniformly transmit and transfer the force between the support member 31 and the mounting device.

[0064] In some embodiments, the extrusion portion 33 has sufficient thickness to restrict the support member 31 from contacting the optical element 2, thereby preventing hard contact between the support member 31 and the optical element 2 and protecting the surface of the optical element 2.

[0065] In some embodiments, the extrusion portion 33 is made of silicone material, and the elastic modulus of the extrusion portion 33 is between 0.1 MPa and 10 MPa.

[0066] like Figure 3In the embodiment shown, the support member 31 is provided with a positioning channel 311. The pre-compression part 32 and the extrusion part 33 are connected to each other through the positioning channel 311. When the pre-compression part 32 is under pressure, it can enter the positioning channel 311 and deform and transition to the side of the extrusion part 33, thereby improving the buffering effect. The same applies when the extrusion part 33 is under pressure.

[0067] like Figure 3 In the embodiment shown, the pre-compression part 32 and the extrusion part 33 are integrally formed on both sides of the support member 31 through the connection of the positioning channel 311, which can improve the transmission efficiency of the force and the stability of the pre-compression part 32 and the extrusion part 33 fixed on the support member 31.

[0068] In some embodiments, the surface area of ​​the pre-compression section 32 is the same as the surface area of ​​the extrusion section 33, so that when the assembly pressure is applied, the pressed surface can provide the same pressure as the other side. When the limiter 3 is installed by external force, the pressure of the limiter 3 needs to be calculated based on the material properties on the next page. This calculation process is relatively complicated. Making the surface area of ​​the extrusion section 33 and the surface area of ​​the pre-compression section 32 the same can eliminate some variables. It is only necessary to calculate the required assembly pressure and how much pre-pressure the external force provides to offset the stress caused by the temperature change of the process based on the material properties, which can reduce the difficulty of calculation and design.

[0069] like Figure 4 In the embodiment shown, the limiter 3 is provided with an extension 34 on the side near the support 1. The extension 34 is adapted to connect with the adhesive surface to expand the adhesive area of ​​the adhesive surface, thereby improving the adhesive stability between the limiter 3 and the support 1 on this side.

[0070] like Figure 4 In the embodiment shown, the extension 34 has at least one extension end 341 and at least one notch 342 formed on the side near the optical element 2. The extension end 341 is adapted to engage with the carrier 1, and the notch 342 is adapted to engage with the carrier 1. The engagement between the extension end 341 and the notch 342 and the carrier 1 can help the limiter 3 and the carrier 1 to obtain a certain stability before bonding, which can assist the bonding process and reduce the bonding difficulty.

[0071] like Figure 5 In the embodiment shown, the support 1 is provided with a locking groove 11. When the limiter 3 is connected to the support 1 and abuts against the optical element 2, the locking groove 11 is adapted to accommodate the extension 34 and restrict the extension 34 from disengaging at least in the direction perpendicular to the bonding surface of the extension 34. The extension 34 and the locking groove 11 cooperate to serve as a positioning assembly structure to ensure the accuracy of the assembly position of the support 31.

[0072] like Figure 4In the embodiment shown, the extension 34 has multiple extension ends 341 and multiple notches 342 formed on the side near the optical element 2 to form a fin-like structure, which can reduce the structural strength of the extension 34 and make it easier for the extension 34 to enter the engagement groove 11.

[0073] In some embodiments, a locking structure may be provided in the locking groove 11 to cooperate with the fixing of the extension end 341 and / or the notch 342 in the locking groove 11.

[0074] like Figures 6 to 11 In the embodiment shown, the limiter 3 is provided with a first positioning end 35 and a second positioning end 36. The first positioning end 35 is provided with a hinge interface 351, and the support 1 is provided with a positioning part 12. The hinge interface 351 and the positioning part 12 are adapted to be connected to each other so that the second positioning end 36 is adapted to rotate relative to the first positioning end 35. The second positioning end 36 is adapted to be connected to the support 1 when it moves to the support 1. The limiter 3 is pre-fixed to the support 1 by hinge with the first positioning end 35, which reduces the assembly difficulty between the limiter 3 and the optical element 2 and improves the assembly accuracy.

[0075] In some embodiments, the length of the hinge interface 351 along the line connecting the first positioning end 35 and the second positioning end 36 is greater than the diameter of the positioning part 12. The positioning part 12 is adapted to move along the connection direction of the first positioning end 35 and the second positioning end 36 in the hinge interface 351, thereby realizing the positioning of the limiter 3 in at least one degree of freedom direction. The support member 31 is fitted with the positioning part 12 and the hinge interface 351 to realize the limiting of the degree of freedom of the hinge interface 351 along the line connecting the first positioning end 35 and the second positioning end 36. During assembly, the positioning part 12 is allowed to move within the hinge interface 351, which facilitates subsequent high-precision assembly.

[0076] In some embodiments, the hinge interface 351 is an oblong opening or a rectangular opening, and the positioning part 12 is a rod-shaped protrusion structure.

[0077] Those skilled in the art should know that errors will occur during the manufacturing and assembly of products. In particular, in the field of camera modules, if manufacturing and assembly errors cause a decrease in the optical performance of the camera module, they need to be given special attention because optical performance is the most critical indicator of the camera module's photo-taking function. In order to prevent excessive deformation of the optical element 2 from causing a decrease in optical performance, attention should be paid to the deformation problem caused by excessive pre-pressure when the limiter 3 is assembled onto the optical element 2.

[0078] like Figure 3 and Figure 8In the embodiment shown, the first positioning end 35 is provided with a first bending portion and a fitting edge 352, the support base 1 is provided with a support edge 13 facing the surface of the optical element 2, the fitting edge 352 is adapted to fit onto the support edge 13, and the first bending portion is adapted to deform to push the limiter 3 closer to the surface of the optical element 2.

[0079] like Figure 3 and Figure 8 In the illustrated embodiment, the first bending portion includes a first bending segment 353 and a second bending segment 354 with different bending directions. The first bending segment 353 is away from the fitting edge 352, and the second bending segment 354 is close to the fitting edge 352. The angle of the first bending segment 353 is greater than the angle of the second bending segment 354. The first positioning end 35 generates self-deformation capability through multiple bends. After the first positioning end 35 and the carrier 1 are engaged, the self-deformation capability of the first positioning end 35 enables the limiter 3 to obtain a force away from the surface of the optical element. In order to make the assembly process smoother, especially to ensure that the support member 31 can be rotated and inserted for assembly after the first positioning end 35 is hinged to the positioning part 12, the first positioning end 35 is provided with a fitting edge 352, and the carrier 1 is provided with a corresponding fitting edge 352. When the bearing edge 13 of the support member 31 is inserted into the positioning part 12 after the hinge interface 351 of the support member 31 is rotated to a certain extent, the fitting edge 352 can fit with the bearing edge 13 and generate a large compressive force, thereby helping the support member 31 to fix the optical element 2. At this time, if the fitting edge 352 fits with the bearing edge 13, as the source of force, the second bending segment 354 is closer to the force point, and one side of the second bending segment 354 is parallel to the compressive force, while the first bending segment 353 is farther from the force point. Therefore, the side where the first bending segment 353 is located is more likely to deform. In this application, the included angle of the first bending segment 353 is larger to provide more deformation margin during the rotation insertion process, and also to ensure that the support member 31 can be assembled in a way that fits the bearing seat 1, and to allow the support member 31 to be assembled at a larger angle.

[0080] like Figure 8 In the embodiment shown, an adhesive surface is provided on the second positioning end 36, and it is connected to the carrier 1 by an adhesive 4. By providing an adhesive surface on the second positioning end 36 and bonding it to the carrier 1, the rotational force transmitted from the first positioning end 35 can be overcome, thereby improving the stability of the support 31.

[0081] like Figure 3 and Figure 8In the embodiment shown, the second positioning end 36 is provided with a second bend and an insertion edge 361. The support 1 is provided with an alignment slot 14. The insertion edge 361 is adapted to be inserted into the alignment slot 14. The insertion edge 361 is provided with an adhesive surface. The insertion depth of the insertion edge 361 is adapted to be determined by the adhesive position of the adhesive 4 in the adhesive surface. The second bend is adapted to deform to overcome the stress generated by the adhesion between the insertion edge 361 and the support 1. It can be understood that the insertion depth of the insertion edge 361 can adjust the preload of the preload member, thereby providing preload support force of different strengths. Since the second bend has bending segments in at least two directions, the second bend is the most easily deformable part of the first support member 31 as a whole. The adhesive and preload stress can be released by the preferential deformation of the second bend.

[0082] In some embodiments, since the insertion edge 361 rotates relative to the positioning part 12 and is inserted into the alignment slot 14, the opening of the alignment slot 14 needs to be set large enough to avoid structural interference between the insertion edge 361 and the support seat 1. At the same time, a guide structure, such as a ladder structure, can be provided in the alignment slot 14 to guide and limit the insertion edge 361 entering the alignment slot 14, thereby improving the insertion stability of the insertion edge 14 in the alignment slot 14.

[0083] like Figure 3 and Figure 8 In the illustrated embodiment, the second bending portion includes a third bending segment 362 and a fourth bending segment 363 with different bending directions. The third bending segment 362 is away from the insertion edge 361, and the fourth bending segment 363 is close to the insertion edge 361. The angle of the third bending segment 362 is greater than the angle of the fourth bending segment 363. The second positioning end 36 generates self-deformation capability through multiple bends. After the second positioning end 36 and the bearing seat 1 are engaged, the self-deformation capability of the second positioning end 36 enables the limiter 3 to obtain a force away from the surface of the optical element. The second positioning end 36 has a third bending segment 362 and a fourth bending segment 363, wherein the third bending segment 362 is nearly parallel to the surface of the pre-pressure, and the third bending segment 362 is greater than the fourth bending segment 363. The fourth bending segment 363 is closer to the pre-compression section 32, so it is obvious that the pre-compression torque on the fourth bending segment 363 is longer. Therefore, the fourth bending segment 363 is more easily deformed than the third bending segment 362. In this application, the fourth bending segment 363 is the more easily deformable end. If the third bending segment 362 deforms too much, there may be a risk of breakage. Therefore, the angle of the third bending segment 362 is designed to be smaller than that of the fourth bending segment 363 to increase the stiffness of the third bending segment 362. This makes the stiffness of the third bending segment 362 and the fourth bending segment 363 consistent, allowing the entire second bending section to deform to prevent excessive pressure from causing excessive insertion depth, which would lead to severe deformation of the optical element 2.

[0084] In some embodiments, the adhesive surface on the second positioning end 36 is disposed at the insertion edge 361, and the insertion edge 361 can release stress and achieve an anti-torsion effect by bending deformation and bonding with adhesive 4.

[0085] like Figures 9 to 10 In the illustrated embodiment, during assembly, after the first positioning end 35 is fitted onto the positioning part 12, the support member 31 can be fixed near the engagement groove 11 of the bearing seat 1 via the extension 34. The extension 34 of the support member 31 and the engagement groove 11 of the bearing seat 1 are located on the outside of the positioning part 12, and the extension 34 and the engagement groove 11 are arranged along the line connecting the first positioning end 35 and the second positioning end 36. This allows the support member 31 to rotate around the positioning part 12 with the positioning part 12 as the rotation center after the first positioning end 35 is fitted onto the positioning part 12, until the extension 34 and the engagement groove 11 engage in the direction perpendicular to the line connecting the first positioning end 35 and the second positioning end 36. This limits the first support member 31 in the second degree of freedom direction. Finally, the fixed support member 31 and the bearing seat 1 are bonded together with adhesive 4.

[0086] like Figure 10 In the embodiment shown, during assembly, the insertion edge 361 is used as the installation position, and the support 31 is rotated so that the insertion edge 361 is aligned with the alignment slot 14.

[0087] like Figure 10 In the embodiment shown, during assembly, the installation device uses the extrusion portion 33 of the support member 31 as the pressing end to press it to a certain height to meet the design requirements. Since the pressing force is perpendicular to the surface of the optical element 2, there are at least two rotational torque points on the outer or inner sides of the multiple bending sections of the first positioning end 35 and the second positioning end 36. As the parts with the least stiffness in the support member 31, the first positioning end 35 and the second positioning end 36 will deform themselves when the design limit is exceeded to prevent overpressure, thereby protecting the structural integrity of the optical element 2 and ensuring that the optical performance is not reduced due to the deformation of the optical element 2.

[0088] In some embodiments, the width of the extension 34 is greater than the width of the insertion edge 361. As can be seen from the above assembly sequence, the adhesive fixation of the limiter 3 on one side of the extension 34 is to ensure the overall stability of the limiter 3 on the surface of the optical element 2. Compared with the adhesive fixation between the first positioning end 35 and the carrier 1, the adhesive fixation of the limiter 3 on one side of the extension 34 has a greater impact on the stability of the limiter 3. This is because the movement of the limiter 3 causes the optical element 2 to shift, which will result in poor optical performance. When the position shift is severe, the camera module cannot form an image. Therefore, increasing the adhesive area of ​​the limiter 3 on one side of the extension 34 as much as possible is beneficial to maintaining imaging performance.

[0089] like Figure 12 In the embodiment shown, the support 1 has a recess 15 on the side near the positioning part 12. The recess 15 is suitable for accommodating the optical element 2 and cooperates with the limiter 3 to fix the optical element 2 during the connection between the limiter 3 and the support 1.

[0090] In some embodiments, the notch 15 is disposed close to the positioning part 12 so that when the first positioning end 35 and the positioning part 12 are engaged, pressure is simultaneously applied to the optical element 2 at the notch 15 to prevent the optical element 2 from loosening within the notch 15.

[0091] In some embodiments, a support plate 16 is provided on the carrier 1. The support plate 16 is adapted to support the optical element 2 and to cover part of the bottom surface of the optical element 2. The support plate 16 and the optical element 2 are connected by an adhesive 4.

[0092] like Figure 12 In the embodiment shown, the optical element 2 and the carrier 1 are connected by at least three lateral sides and one vertical side to form a W-shaped support structure, which can provide support for the middle, sides and bottom of the optical element 2, reduce the torsional force during the installation of the limiter 3 and prevent the optical element 2 from being eccentric.

[0093] like Figure 13 As shown, this application also provides an electronic device including a lens module of any of the above embodiments.

[0094] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A lens module, characterized in that: The device includes a carrier, an optical element, a limiter, and an adhesive. The carrier is adapted to accommodate the optical element. The limiter includes a support member with a pre-compression portion near the optical element. The minimum frictional force between the pre-compression portion and the optical element is not less than the weight of the optical element. The limiter is adapted to connect to the carrier and press the optical element onto the carrier. At least one adhesive surface is provided around the limiter. The adhesive is adapted to be disposed between the adhesive surface and the carrier. The elastic modulus of the pre-compression portion is less than the elastic modulus of the support member and less than the elastic modulus of the optical element.

2. A lens module as described in claim 1, characterized in that: The support member has an extrusion section on the side away from the optical element. The elastic modulus of the extrusion section is less than that of the support member and less than that of the optical element. The pre-compression section is adapted to deform in order to uniformly distribute the force between the support member and the mounting device.

3. A lens module as described in claim 2, characterized in that: The support member has a positioning channel, and the pre-compression part and the extrusion part are connected to each other through the positioning channel; the surface area of ​​the pre-compression part and the surface area of ​​the extrusion part are the same.

4. A lens module as described in claim 1, characterized in that: The maximum pressure applied by the pre-compression section to the optical element is less than the minimum stress required for the optical element to undergo elastic deformation.

5. A lens module as described in claim 1, characterized in that: The deformation generated when the pre-compression part touches the optical element is not less than the maximum deformation generated when the pre-compression part overcomes gravity.

6. A lens module as described in claim 1, characterized in that: The optical element has a pre-pressure zone on its surface. The coefficient of friction of the optical element in the pre-pressure zone is greater than the coefficient of friction in the area outside the pre-pressure zone. The pre-pressure part is adapted to fit against the pre-pressure zone.

7. A lens module as described in claim 6, characterized in that: The surface friction coefficient of the pre-compression section is 0.3 to 0.7, and the friction coefficient of the pre-compression zone is 0.1 to 0.

3.

8. A lens module as described in claim 1, characterized in that: The limiter has an extension on the side near the support seat, and the extension is adapted to connect with the adhesive surface to increase the adhesive area of ​​the adhesive surface.

9. A lens module as described in claim 8, characterized in that: The extension has at least one extension end and at least one notch formed on the side near the optical element. The extension end is adapted to engage with the carrier, and the notch is adapted to engage with the carrier. The carrier is provided with an engagement groove. When the limiter is connected to the carrier and abuts against the optical element, the engagement groove is adapted to accommodate the extension and restrict the extension from disengaging at least in the direction perpendicular to the adhesive surface where the extension is joined.

10. An electronic device, characterized in that: Includes the lens module as described in any one of claims 1 to 9.

Images