Lens assembly, lens assembly assembly method and camera module

Abstract

The present application discloses a lens assembly, a lens assembly assembly method and a camera module, and belongs to the field of camera module technology. The lens assembly includes a lens barrel, a lens group and a pressing member, wherein the lens barrel includes an inner peripheral wall, a light incident side and a light exit side, the inner peripheral wall forms a mounting cavity penetrating the light incident side and the light exit side, and the size of the mounting cavity located on the light incident side is larger than the light exit side, the lens group is installed in the mounting cavity, and includes a first lens located on the light incident side, the first lens includes a first optical zone and a first structural zone surrounding the first optical zone, the first structural zone includes an upper surface close to the light incident side and a side surface adjacent to the upper surface, the pressing member includes a first pressing surface opposite to the inner peripheral wall, and a second pressing surface opposite to the upper surface, the first pressing surface abuts against the inner peripheral wall of the lens barrel, the second pressing surface abuts against the upper surface of the first lens, and the pressing member keeps the side surface of the first lens interference-fitted on the inner peripheral wall of the lens barrel. It has the characteristics of reducing the risk of lens breakage.

Description

Technical Field

[0001] The present application relates to the technical field of camera modules, and in particular to a lens assembly, a lens assembly assembly method and a camera module. Background Art

[0002] The camera module includes a lens assembly for focusing and a photosensitive assembly for imaging. Among them, the lens assembly includes a lens barrel and a first lens arranged on the light incident side of the lens barrel, and the first lens includes a first optical area for processing light and a first structural area arranged outside the first optical area for connecting with the lens barrel. At present, the first lens and the lens barrel are generally connected in two ways: gluing or bearing. Bearing means that the first lens is interference-fitted in the lens barrel, and the first structural area of ​​the first lens abuts against the inner wall of the lens barrel. Among them, the gluing method has problems such as poor connection reliability and glue overflow affecting the optical effect of the first optical area.

[0003] As for the supporting method, firstly, the interference fit between the first structural area of ​​the first lens and the inner wall of the lens barrel will cause the stress to be concentrated in the area where the first structural area abuts the lens barrel; secondly, the uneven contact between the first lens and the lens barrel and the uneven installation force during the installation of the first lens may also cause the stress to be concentrated in the area where the first structural area abuts the lens barrel; in addition, since the first lens and the lens barrel are made of different materials and have different thermal expansion coefficients, under the impact of high and low temperatures, the expansion and contraction of the first lens and the lens barrel may cause a gap between the two, causing the first lens to shift, and the two may also produce further interference, causing the stress to be concentrated in the area where the first structural area abuts the lens barrel. The first lens is approximately a planar object, which is susceptible to stress when it is supported by the edge area, and the first lens is usually made of brittle materials, such as glass. The above reasons lead to the risk of the first lens being broken when the stress is concentrated. Summary of the invention

[0004] The purpose of this application is to provide a lens assembly, a lens assembly assembly method and a camera module to reduce the risk of the first lens being broken.

[0005] In order to achieve one of the above purposes, the technical solution adopted in the present application is: a lens assembly, which includes:

[0006] The lens barrel comprises an inner peripheral wall, a light incident side and a light exit side, wherein the inner peripheral wall forms a mounting cavity penetrating the light incident side and the light exit side, and a size of the mounting cavity at the light incident side is larger than a size at the light exit side;

[0007] A lens group, the lens group is installed in the installation cavity and defines an optical axis, the lens group includes a first lens located at the light incident side, the first lens includes a first optical zone and a first structural zone surrounding the first optical zone, the first structural zone includes an upper surface close to the light incident side and a side surface adjacent to the upper surface;

[0008] A pressing member is arranged between the lens barrel and the first lens on the light incident side, and the pressing member includes a first pressing surface opposite to the inner circumferential wall of the lens barrel, and a second pressing surface opposite to the upper surface of the first lens, wherein the first pressing surface abuts against the inner circumferential wall of the lens barrel, and the second pressing surface abuts against the upper surface of the first lens; the pressing member keeps the side surface of the first lens interference-fitted against the inner circumferential wall of the lens barrel.

[0009] In some embodiments, the pressing member includes a top, a bottom, an outer portion and an inner portion, the top faces the light incident side, the bottom faces the light exit side, the outer portion faces the inner circumferential wall of the lens barrel, and the inner portion faces the optical axis; wherein the top includes a top surface, the outer portion includes the first pressing surface, the bottom includes the second pressing surface, and the inner portion includes an inner surface.

[0010] In some embodiments, a buffer groove is provided at the bottom of the pressing member, and the buffer groove is provided between the first pressing surface and the second pressing surface. The buffer groove includes a groove surface provided close to the light incident side, and the distance from the groove surface to the top surface is smaller than the distance from the second pressing surface to the top surface.

[0011] In some embodiments, a glue groove is formed between the top of the pressing member and the inner wall of the lens barrel, which is suitable for fixing the pressing member to the lens barrel by setting glue only in the glue groove, and the pressing member keeps the lens group installed in the lens barrel.

[0012] In some embodiments, the inner surface of the pressing member includes a first area and a second area connected to each other, the first area is connected to the top surface of the pressing member and extends obliquely from the top surface toward the first optical zone of the first lens, the second area is located on the side facing the second pressing surface and opposite to the first structural area of ​​the first lens, the second area is connected to the second pressing surface of the pressing member and extends obliquely from the second pressing surface toward the first optical zone of the first lens to block stray light entering the first lens.

[0013] In some embodiments, a dimension of the top surface of the pressing member along a direction perpendicular to the optical axis is greater than a dimension of the second pressing surface along a direction perpendicular to the optical axis.

[0014] In some embodiments, the pressing member is made of elastic material, and the first lens is made of glass material.

[0015] In some embodiments, the lens group also includes at least one second lens coaxially arranged with the first lens, and along the direction from the light incident side to the light exit side of the optical axis, the diameter of each lens in the lens group gradually decreases, and a spacer is arranged between the first lens and the second lens, and the spacer includes a first supporting surface facing the light incident side and a second supporting surface facing the light exit side, the first supporting surface abuts against the first lens, and the second supporting surface abuts against the second lens.

[0016] In some embodiments, the inner circumferential wall of the lens barrel includes a first inner circumferential wall and a second inner circumferential wall, the first inner circumferential wall extends in a direction parallel to the optical axis and abuts against the first pressing surface, the second inner circumferential wall extends in a direction parallel to the optical axis and abuts against the side surface of the first lens, and the diameter of the first inner circumferential wall is greater than the diameter of the second inner circumferential wall.

[0017] In some embodiments, a protective member is further included, wherein the lens barrel is provided with a protrusion on the light incident side that protrudes away from the optical axis, and the protective member is provided on the protrusion and extends in a direction perpendicular to the optical axis to above the lens barrel and the pressing member to protect the lens barrel, the pressing member and the lens group.

[0018] To achieve one of the above purposes, the present application provides a method for assembling a lens assembly, which comprises the steps of:

[0019] S1. Provide a lens barrel, the lens barrel comprising an inner circumferential wall, a light incident side and a light exiting side, the inner circumferential wall forming a mounting cavity penetrating the light incident side and the light exiting side, and a size of the mounting cavity at the light incident side is larger than a size at the light exiting side;

[0020] S2. Provide a lens group, which is installed in the installation cavity and defines an optical axis, wherein the lens located on the light incident side is a first lens, the first lens includes a first optical zone and a first structural zone surrounding the first optical zone, the first structural zone includes an upper surface close to the light incident side and a side surface adjacent to the upper surface, the side surface abuts against the inner peripheral wall and is interference fit;

[0021] S3, providing a pressing member, the pressing member comprising a first pressing surface suitable for abutting against the inner peripheral wall of the lens barrel, a second pressing surface suitable for abutting against the upper surface of the first lens, and a top portion facing away from the second pressing surface, so that the first pressing surface abuts against the inner peripheral wall of the lens barrel, and the second pressing surface abuts against the upper surface of the first lens;

[0022] S4. A glue groove is formed between the top of the pressing member and the inner circumferential wall of the lens barrel. The pressing member is fixed to the lens barrel by setting glue only in the glue groove. The pressing member keeps the lens group installed in the lens barrel.

[0023] In order to achieve one of the above purposes, the present application provides a camera module, which includes a lens assembly and a photosensitive assembly. The lens assembly is any one of the above-mentioned lens assemblies, or a lens assembly assembled using the assembly method of the above-mentioned lens assemblies, and the photosensitive assembly is arranged on the light-emitting side of the lens assembly.

[0024] Compared with the prior art, the beneficial effects of the present application are as follows: (1) by arranging a pressing member on the side of the first lens facing the light incident side, the pressing member abuts against the inner peripheral wall of the lens barrel and the upper surface of the first structural area of ​​the first lens respectively, the force direction of the first lens is changed, the stress at the side surface of the first structural area of ​​the first lens is reduced, so that the stress will not be concentrated on the side surface of the first structural area of ​​the first lens, thereby reducing the risk of the first lens being broken due to excessive local stress; (2) by arranging glue bonding only between the pressing member and the lens barrel, the structural reliability is increased and the deformation during the curing process of the glue or under high and low temperature shocks can be avoided. (3) The pressing member can prevent the first lens from shifting toward the light incident side. Even when the first lens and the lens barrel expand and contract under high and low temperature shocks, resulting in a gap between the two, the setting of the pressing member can prevent the displacement of the first lens. (4) The pressing member is made of elastic material, which can absorb the deformation of the first lens and the lens barrel, reducing the risk of the first lens being broken. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the cross-sectional structure of the lens assembly in some embodiments of the present application.

[0026] Figure 2 for Figure 1 A magnified schematic diagram of the local structure at point Ⅰ in the middle.

[0027] Figure 3 This is a schematic diagram of the exploded structure of the lens assembly in some embodiments of the present application.

[0028] Figure 4 Schematic diagram of the cross-sectional structure of the lens barrel in some embodiments of the present application.

[0029] Figure 5 This is a schematic diagram of the structure of the pressure member in some embodiments of the present application.

[0030] Figure 6 for Figure 1 A magnified schematic diagram of the local structure at point Ⅰ in the middle.

[0031] Figure 7Schematic diagram of the cross-sectional structure of the lens assembly in some other embodiments of the present application.

[0032] Figure 8 Schematic diagram of the cross-sectional structure of the lens assembly in some further embodiments of the present application.

[0033] Fig. 9 This is a schematic diagram of the structure of the camera module in some embodiments of the present application.

[0034] In the figure: L, optical axis; 10, lens barrel; 11, light incident side; 111, protrusion; 12, inner peripheral wall; 121, mounting cavity; 122, first inner peripheral wall; 123, second inner peripheral wall; 13, light exit side; 20, lens group; 21, first lens; 211, first optical zone; 212, first structural zone; 2121, upper surface; 2122, side surface; 2123, lower surface; 22, second lens; 221, second optical zone; 222, second structural zone; 30, spacer; 31, first lens Support surface; 32, second support surface; 33, side support surface; 40, spacer; 50, pressing member; 51, top; 511, top surface; 512, glue storage groove; 52, outer side; 521, first pressing surface; 53, bottom; 531, second pressing surface; 532, buffer groove; 5321, groove surface; 54, inner side; 541, inner surface; 5411, first area; 5412, second area; 61, photosensitive chip; 62, chip circuit board; 71, filter element; 72, bracket. DETAILED DESCRIPTION

[0035] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0036] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific scope of protection of the present application.

[0037] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0038] The terms "including" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0039] In the design of lens assemblies, "entrance pupil diameter" usually refers to the aperture diameter of the lens assembly, which refers to the size of the maximum opening for light to enter the lens assembly. A larger entrance pupil diameter means that the lens assembly can collect more light, thereby improving the brightness and contrast of the image to a certain extent; "effective focal length" refers to the actual length of the focal length of the lens assembly. A longer effective focal length means that the lens assembly can magnify the image of distant objects larger, provide a higher magnification, and provide more details and clear visual effects; "aperture coefficient" refers to the relative size of the aperture, and the aperture coefficient is equal to the effective focal length divided by the aperture diameter.

[0040] Since a longer effective focal length requires the light to remain focused on a longer optical path, more light is needed to maintain the brightness of the image. Therefore, as the effective focal length increases, in order to maintain the same optical performance, the entrance pupil diameter needs to be increased, that is, the aperture diameter needs to be increased. If the aperture diameter is too small, the lens assembly may not be able to collect enough light, resulting in a decrease in image quality. At the same time, if the effective focal length increases and the aperture diameter remains unchanged, the aperture coefficient becomes larger, which means that the relative size of the aperture actually becomes smaller, resulting in a decrease in the amount of light entering the lens assembly. Therefore, in order to ensure that enough light is collected, the aperture diameter needs to be increased, which means that the diameter of the first lens of the lens assembly located on the incident side of the light needs to be increased in accordance with the aperture diameter, and the first lens is abbreviated as the first lens 21. Furthermore, the larger diameter of the first lens 21 helps to design a more complex optical system, improves imaging quality, and ensures that the entire image field can receive light and form a clear image. In short, the diameter of the first lens 21 increases with the increase of the focal length, which is conducive to collecting more light and improving the flexibility of optical design.

[0041] To this end, the present application provides a lens assembly, such as Figure 1-Figure 8 As shown, the size of the lens assembly at the light incident side is larger than that at the light exiting side, so that the first lens 21 with the largest diameter is installed on the light incident side of the lens assembly.

[0042] Specifically, the lens assembly includes a lens barrel 10 and a lens group 20, and the lens group 20 is assembled in the lens barrel 10. The lens barrel 10 includes a light incident side 11, a light exit side 13 and an inner peripheral wall 12, and the inner peripheral wall 12 forms a mounting cavity 121 that penetrates the light incident side 11 and the light exit side 13. The lens group 20 is installed in the mounting cavity 121 and defines an optical axis L. The lens group 20 includes at least two lenses, that is, the lens group 20 includes a first lens 21 located at the light incident side 11 and other lenses closer to the light exit side 13 relative to the first lens 21. Further, each lens is coaxially arranged along the optical axis L, and along the direction of the optical axis L from the light incident side 11 to the light exit side 13, the diameter of each lens in the lens group 20 gradually decreases. It is easy to understand that, considering that the diameter of the first lens 21 is larger than the diameters of other lenses in the lens group 20, the size of the mounting cavity 121 or the lens barrel 10 at the light incident side 11 is correspondingly larger than the size at the light exit side 13, so as to provide sufficient mounting space for the first lens 21 at the light incident side 11. When assembling the lens assembly, the lenses in the lens group 20 can be sequentially mounted in the mounting cavity 121 of the lens barrel 10 in order of diameter from small to large.

[0043] In some embodiments, the first lens 21 is made of glass, and the other lenses are made of glass or plastic. Glass lenses have a higher refractive index and transmittance, which is beneficial to improving imaging quality, and glass lenses are more stable and durable.

[0044] In some embodiments, the lens barrel 10 is made of plastic, which has low cost, light weight, and is easy to process into a desired shape.

[0045] In some embodiments, the first lens 21 includes a first optical zone 211 for collecting light and a first structural zone 212 disposed on the periphery of the first optical zone 211 for connecting with the lens barrel 10. The first structural zone 212 of the first lens 21 includes an upper surface 2121 close to the light incident side 11, a side surface 2122 adjacent to the upper surface 2121, and a lower surface 2123 facing the light exiting side 13. Further, the upper surface 2121 and the lower surface 2123 of the first structural zone 212 are both configured as planes, and the side surface 2122 is configured as a cylindrical surface so as to make surface contact with other components, which is beneficial to increase the connection strength and force stability.

[0046] In some embodiments, the lens group 20 includes a second lens 22 disposed adjacent to the first lens 21, the second lens 22 includes a second optical zone 221 for processing light and a second structural zone 222 disposed outside the second optical zone 221 for connecting to the lens barrel 10, and the second optical zone 221 is disposed opposite to the first optical zone 211. Further, a spacer 30 is provided between the first lens 21 and the second lens 22. The spacer 30 includes a first support surface 31 facing the light incident side 11, a second support surface 32 facing the light exit side 13, and a side support surface 33 connecting the first support surface 31 and the second support surface 32. The first support surface 31 abuts against the lower surface 2123 of the first structural area 212 of the first lens 21, the second support surface 32 abuts against the second structural area 222 of the second lens 22, and the side support surface 33 abuts against the inner peripheral wall 12 of the lens barrel 10, so that the first lens 21 and the second lens 22 are connected in the direction of the optical axis L, which can not only stably support the first lens 21 and the second lens 22 in the mounting cavity 121 of the lens barrel 10, but also avoid stress concentration at the second structural area 222 of the second lens 22. Further, the first support surface 31 and the second support surface 32 of the spacer 30 are both set as planes to provide more stable support, which is conducive to increasing the connection strength and force stability.

[0047] In some embodiments, spacers 40 are further provided on two opposite sides of some or all of the lenses along the optical axis L, which are used to fix and support the position of the lenses, and can prevent dust and impurities from entering, reduce reflections, absorb stray light, etc. In a specific embodiment, a spacer 40 is provided between the lower surface 2123 of the first lens 21 and the first supporting surface 31 of the spacer 30, and another spacer 40 is provided between the second supporting surface 32 of the spacer 30 and the second lens 22.

[0048] In some embodiments, the first lens 21 is fixed to the lens barrel 10 by gluing. Specifically, the first structural area 212 of the first lens 21 is bonded to the inner peripheral wall 12 of the lens barrel 10 by glue. The gluing connection has low reliability, and the first lens 21 may be separated from the lens barrel 10 when the lens assembly falls or collides. Further, in order to enable the glue to provide sufficient bonding strength, a sufficient amount of glue may be provided between the first structural area 212 and the inner peripheral wall 12, and there is a risk that the glue overflows and affects the optical effect of the first optical area 211. Furthermore, the first lens 21 and the lens barrel 10 are made of different materials, and the thermal expansion coefficients of the two are also different. Under high and low temperature impacts, the first lens 21 and the lens barrel 10 respectively expand and contract, which may cause stress between the two, thereby causing debonding and glue breakage. In addition, the thermal expansion coefficient of the glue itself is also greater than that of the first lens 21 made of glass. Under high and low temperature impacts, the deformation of the glue is more severe than that of the first lens 21. The curing shrinkage of the glue may affect the surface shape and position of the first lens 21.

[0049] In some embodiments, the first lens 21 is fixed to the lens barrel 10 by a bearing method, and no glue is directly provided between the first lens 21 and the lens barrel 10 to avoid the risks that may be generated in the adhesive fixing method. Specifically, the side surface 2122 of the first structural area 212 of the first lens 21 bears against the inner peripheral wall 12 of the lens barrel 10 and has an interference fit therewith, which is conducive to improving the structural stability and reliability, and avoids the above-mentioned adverse effects caused by directly bonding the first lens 21 with glue. However, the bearing fixing method will cause stress concentration between the side surface 2122 of the first lens 21 and the inner peripheral wall 12 of the lens barrel 10. Firstly, in order to make the first lens 21 firmly fixed on the inner peripheral wall 12 of the lens barrel 10, it is necessary to make the outer diameter of the first lens 21 slightly larger than the inner diameter of the inner peripheral wall 12 at the corresponding position, so that the first lens 21 is installed on the inner peripheral wall 12 with interference fit, and this interference fit method will cause a large amount of stress to be concentrated on the side surface 2122 of the first structural area 212; secondly, the uneven contact between the side surface 2122 and the inner peripheral wall 12, and the uneven installation force during the installation of the first lens 21 may also cause the stress to be concentrated on the side surface 2122; in addition, since the first lens 21 and the lens barrel 10 are made of different materials and have different thermal expansion coefficients, under the impact of high and low temperatures, the expansion and contraction deformation of the first lens 21 and the lens barrel 10 may cause a gap between the two, causing the first lens 21 to shift, and the two may also have further interference fit, resulting in further increase of the concentrated stress at the side surface 2122. It should be understood that the first lens 21 is approximately an object extending in the horizontal direction, and its side surface 2122 near the edge area is susceptible to concentrated stress when supported, and because the first lens 21 is usually made of a brittle material, such as glass, one or more of the above reasons may cause the first lens 21 to be at risk of breakage when the stress concentration at the side surface 2122 is large.

[0050] When the side surface 2122 of the first structural area 212 of the first lens 21 is fixed to the inner peripheral wall 12 of the lens barrel 10, there is a risk of stress concentration causing the first lens 21 to break. In order to solve this problem, the present application provides the following technical solutions:

[0051] The lens assembly includes a pressing member 50, which is arranged between the lens barrel 10 and the first lens 21 on the light incident side 11. The pressing member 50 includes a first pressing surface 521 opposite to the inner circumferential wall 12 of the lens barrel 10, and a second pressing surface 531 opposite to the upper surface 2121 of the first lens 21, wherein the first pressing surface 521 abuts against the inner circumferential wall 12 of the lens barrel 10, and the second pressing surface 531 abuts against the upper surface 2121 of the first lens 21; the pressing member 50 keeps the side surface 2122 of the first lens 21 interference-fitted against the inner circumferential wall 12 of the lens barrel 10. When the first lens 21 is in interference fit with the lens barrel 10, it will be squeezed by the lens barrel 10 and will tend to move toward the light incident side 11. A pressing member 50 is arranged on the side of the first lens 21 facing the light incident side 11, and the pressing member 50 abuts against the inner peripheral wall 12 of the lens barrel 10 and the upper surface 2121 of the first structural area 212 of the first lens 21, respectively, so as to change the force direction of the first lens 21. That is, the stress can be dispersed on the side surface 2122 and the upper surface 2121 of the first lens 21, reducing the degree of stress concentration at the side surface 2122 of the first structural area 212 of the first lens 21, thereby reducing the risk of the first lens 21 being broken due to excessive local stress. The pressing member 50 limits the position of the first lens 21 in the direction of the optical axis L. Even under high and low temperature impact, when the first lens 21 and the lens barrel 10 undergo expansion and contraction deformation, resulting in a gap between the two, the setting of the pressing member 50 can still prevent the displacement of the first lens 21, which is conducive to improving the structural reliability.

[0052] In some embodiments, the pressing member 50 is made of elastic material, which can absorb the impact force of the lens barrel 10 on the first lens 21 when the lens assembly falls or collides, thereby reducing the risk of the first lens 21 being broken. The pressing member 50 can also absorb the force generated by the deformation of the first lens 21 and / or the lens barrel 10 due to temperature changes, avoiding stress concentration at the side surface 2122 of the first lens 21 and the inner peripheral wall 12 of the lens barrel 10 due to thermal expansion mismatch, thereby reducing the risk of the first lens 21 being broken. Further, the pressing member 50 can be made of plastic material, which has low cost, low weight, and is easy to process and manufacture.

[0053] In some embodiments, the pressing member 50 is an annular structure coaxially arranged with the first lens 21, and includes a top portion 51, a bottom portion 53, an outer portion 52 and an inner portion 54, wherein the top portion 51 faces the light incident side 11, the bottom portion 53 faces the light emitting side 13, the outer portion 52 faces the inner peripheral wall 12 of the lens barrel 10, and the inner portion 54 faces the optical axis L; wherein the top portion 51 includes a top surface 511, the outer portion 52 includes a first pressing surface 521 adapted to abut against the inner peripheral wall 12 of the lens barrel 10, the bottom portion 53 includes a second pressing surface 531 adapted to abut against the first lens 21, and the inner portion 54 includes an inner surface 541. In other words, the outer portion 52 of the pressing member 50 away from the optical axis L forms a lens barrel bearing portion to abut against the inner peripheral wall 12 of the lens barrel 10, and the side of the pressing member 50 facing the light emitting side 13 forms a lens bearing portion to abut against the first lens 21.

[0054] In some embodiments, the first pressing surface 521 is set as a cylindrical surface, and the second pressing surface 531 is set as a plane, so as to make surface contact with the inner peripheral wall 12 of the lens barrel 10 or the upper surface 2121 of the first lens 21, and the surface contact is not easy to be separated, and the connection strength is good and the reliability is high. Further, the first pressing surface 521 is a cylindrical surface arranged parallel to the optical axis L, and the second pressing surface 531 is a plane arranged perpendicular to the optical axis L, and the first pressing surface 521 is perpendicular to the second pressing surface 531. It should be understood that the first pressing surface 521 is parallel to the optical axis L and can also include the situation that the first pressing surface 521 is approximately parallel to the optical axis L, for example, the first pressing surface 521 and the optical axis L have an angle less than 5°. The second pressing surface 531 is perpendicular to the optical axis L and can also include the situation that the second pressing surface 531 is approximately perpendicular to the optical axis L, for example, the second pressing surface 531 and the optical axis L have an angle greater than 85° and less than 95°.

[0055] In some embodiments, the bottom 53 of the pressing member 50 is provided with a buffer groove 532, and the buffer groove 532 is provided between the first pressing surface 521 and the second pressing surface 531, or in other words, the buffer groove 532 is provided at the bottom 53 of the pressing member 50 and is provided on the side of the second pressing surface 531 away from the optical axis L. The buffer groove 532 includes a groove surface 5321 provided close to the light incident side 11, and the distance from the groove surface 5321 to the top surface 511 is smaller than the distance from the second pressing surface 531 to the top surface 511, that is, the buffer groove 532 is concave inwardly relative to the second pressing surface 531 along the direction of the optical axis L. In the case of high and low temperature impact or falling or collision, the bottom 53 of the pressing member 50, especially the local area located at the second pressing surface 531, can be deformed toward the buffer groove 532, so as to play a role in buffering and absorbing energy.

[0056] In some embodiments, Figure 7As shown, the buffer groove 532 is arranged in the middle of the bottom 53 of the pressing member 50 along the direction perpendicular to the optical axis L, and the buffer groove 532 is not connected with the outer portion 52 of the pressing member 50, so as to avoid the setting of the buffer groove 532 causing the first pressing surface 521 on the outer portion 52 to extend in the direction of the optical axis L to be reduced. Further, the buffer groove 532 can be centrally arranged at the bottom 53 of the pressing member 50.

[0057] In some embodiments, the distance from the bottom 53 of the pressing member 50 away from the optical axis L to the top surface 511 is greater than the distance from the second pressing surface 531 to the top surface 511, that is, the surface of the bottom 53 of the pressing member 50 connected to the outer portion 52 is closer to the light emitting side 13 relative to the second pressing surface 531, which is beneficial to increase the length that the first pressing surface 521 can extend along the optical axis L, thereby improving the stability of the pressing member 50.

[0058] In some embodiments, Figure 8 As shown, the buffer groove 532 can extend to connect with the first pressing surface 521 , that is, the side of the buffer groove 532 away from the optical axis L can penetrate the outer portion 52 of the pressing member 50 to provide a larger buffer space.

[0059] In some embodiments, the dimension of the top surface 511 of the pressing member 50 along the direction perpendicular to the optical axis L is greater than the dimension of the second pressing surface 531 along the direction perpendicular to the optical axis L, so as to reasonably configure the structure of the pressing member 50, which not only ensures that there is a sufficient pressing area between the pressing member 50 and the first lens 21 to increase the reliability between the pressing member 50 and the first lens 21, but also allows the top surface 511 of the pressing member 50 to extend toward the optical axis L to achieve the function of blocking stray light.

[0060] In some embodiments, the outer diameter of the pressing member 50 is greater than the diameter of the first lens 21. Projected along the optical axis L, the projection of the first pressing surface 521 is located outside the projection of the side surface 2122 of the first lens 21, and the projection of the second pressing surface 531 falls within the projection of the first structural area 212. The pressing member 50 extends a certain width in a direction perpendicular to the optical axis L so that the pressing member 50 has moderate structural strength and deformation capacity, and the larger outer diameter of the pressing member 50 means that the first pressing surface 521 has a longer circumferential length around the optical axis L, which can provide a larger area for bearing against the inner peripheral wall 12 of the lens barrel 10 to increase the structural strength.

[0061] In some embodiments, the inner circumferential wall 12 of the lens barrel 10 includes a first inner circumferential wall 122 and a second inner circumferential wall 123. The first inner circumferential wall 122 extends in a direction parallel to the optical axis L and abuts against the first pressing surface 521. The second inner circumferential wall 123 extends in a direction parallel to the optical axis L and abuts against the side surface 2122 of the first lens 21. The diameter of the first inner circumferential wall 122 is greater than the diameter of the second inner circumferential wall 123 to provide sufficient installation space for the pressing member 50 in a direction perpendicular to the optical axis L, and to maintain a tight fit between the second inner circumferential wall 123 and the side surface 2122 of the first lens 21.

[0062] In some embodiments, a glue groove 512 is formed between the top 51 of the pressing member 50 and the inner peripheral wall 12 of the lens barrel 10, and the pressing member 50 is fixed to the lens barrel 10 by only setting glue in the glue groove 512, and the pressing member 50 keeps the lens group 20 installed in the lens barrel 10. The glue prevents the pressing member 50 from moving along the optical axis L, thereby limiting the position of the first lens 21 along the optical axis L, which is conducive to increasing the reliability of the structure. In addition, the glue is arranged between the pressing member 50 and the lens barrel 10, which can prevent the deformation and shrinkage during the curing process of the glue or when it is subjected to high and low temperature shocks from affecting the surface shape or position of the first lens 21, thereby avoiding affecting the imaging effect. Specifically, the top 51 of the pressing member 50 is inclined toward the optical axis L from the side of the first pressing surface 521 close to the light incident side 11, and / or the area where the inner circumferential wall 12 of the lens barrel 10 and the top 51 of the pressing member 50 are opposite to each other is inclined toward the optical axis L, thereby forming a glue containing groove 512 between the top 51 of the pressing member 50 and the inner circumferential wall 12 of the lens barrel 10.

[0063] In some embodiments, the inner surface 541 of the pressing member 50 is a cylindrical surface extending along the optical axis L to avoid blocking light.

[0064] In some embodiments, the inner surface 541 of the pressing member 50 includes a first area 5411 and a second area 5412 that are connected to each other. The first area 5411 is connected to the top surface 511 of the pressing member 50 and extends obliquely from the top surface 511 toward the first optical zone 211 of the first lens 21. The second area 5412 is located on the side facing the second pressing surface 531 and is opposite to the first structural area 212 of the first lens 21. The second area 5412 is connected to the second pressing surface 531 of the pressing member 50 and extends obliquely from the second pressing surface 531 toward the first optical zone 211 of the first lens 21 to block stray light entering the first lens 21.

[0065] In some embodiments, in order to reduce the difficulty of assembly and facilitate interference assembly, a chamfer is provided between the outer portion 52 and the bottom 53 of the pressing member 50, and a chamfer is also provided between the side surface 2122 and the lower surface 2123 of the first structural area 212 of the first lens 21.

[0066] In some embodiments, a spacer 30 and / or a spacer 40 are disposed between the lower surface 2123 of the first structural region 212 of the first lens 21 and the second structural region 222 of the second lens 22. The spacer 30 and / or the spacer 40 are in surface contact with the lower surface 2123, and can also disperse stress, so that the stress is dispersed on the upper surface 2121, the side surface 2122 and the lower surface 2123 of the first lens 21, avoiding stress concentration on a small contact surface area resulting in excessive stress, thereby reducing the risk of the first lens 21 being broken due to stress concentration. Furthermore, in some embodiments, the width of the spacer 30 in a direction perpendicular to the optical axis L can be increased to increase the contact area between the spacer 30 and the lower surface 2123 of the first lens 21, so as to better disperse stress and reduce the risk of the first lens 21 being broken.

[0067] In some embodiments, the width W1 of the second pressing surface 531 extending in a direction perpendicular to the optical axis L is not less than 0.1 mm and not more than 0.5 mm. In a specific embodiment, the width W1 of the second pressing surface 531 is 0.22 mm.

[0068] In some embodiments, the width W2 of the first structure area 212 of the first lens 21 extending in a direction perpendicular to the optical axis L is not less than 0.2 mm and not more than 1.0 mm. In a specific embodiment, the width W2 of the first structure area 212 is 0.48 mm.

[0069] In some embodiments, the width W3 of the first supporting surface 31 of the spacer 30 extending in a direction perpendicular to the optical axis L is not less than 0.2 mm and not more than 1.0 mm. In a specific embodiment, the width W3 of the first supporting surface 31 is 0.7 mm.

[0070] In some embodiments, a width W1 of the second pressing surface 531 extending in a direction perpendicular to the optical axis L is smaller than a width W3 of the first supporting surface 31 of the spacer ring 30 extending in a direction perpendicular to the optical axis L. Due to the space limitation in the mounting cavity 121, if a width W1 of the second pressing surface 531 extending in a direction perpendicular to the optical axis L is too large, the inner surface 541 of the first structural zone 212 may be too close to the first optical zone 211, thereby blocking light and affecting imaging quality.

[0071] It can be understood that the width W1 of the second pressing surface 531 extending in a direction perpendicular to the optical axis L and the width W3 of the first supporting surface 31 extending in a direction perpendicular to the optical axis L are as large as possible within a limited space, so as to provide a larger contact area with the first structural area 212, which is conducive to better stress dispersion.

[0072] In some embodiments, the height H1 of the first pressing surface 521 extending along the optical axis L is not less than 0.1 mm and not more than 1.0 mm. In a specific embodiment, the height H1 of the first pressing surface 521 extending along the optical axis L is 0.3 mm.

[0073] In some embodiments, the height H2 of the side surface 2122 of the first structural area 212 extending along the optical axis L is not less than 0.1 mm and not greater than 1.0 mm. In a specific embodiment, the height H2 of the side surface 2122 of the first structural area 212 extending along the optical axis L is 0.13 mm. If the height H2 of the side surface 2122 of the first structural area 212 extending along the optical axis L is large, the total size of the lens assembly along the optical axis L will increase. If the height H2 of the side surface 2122 of the first structural area 212 extending along the optical axis L is small, the contact area between the side surface 2122 and the inner peripheral wall 12 of the lens barrel 10 will be small, and the connection reliability will be low.

[0074] In some embodiments, a height H1 of the first pressing surface 521 extending along the optical axis L is greater than a height H2 of the side surface 2122 of the first structural region 212 extending along the optical axis L. The bearing area between the pressing member 50 and the inner peripheral wall 12 of the lens barrel 10 is greater than the bearing area between the first lens 21 and the inner peripheral wall 12 of the lens barrel 10, so that the pressing member 50 stably and reliably bears on the lens barrel 10, so that the pressing member 50 can reliably press on the first lens 21.

[0075] In some embodiments, considering that the size of the mounting cavity 121 of the lens assembly on the light incident side 11 is larger than the size on the light emitting side 13, impurities such as dust and water droplets are easily introduced into the mounting cavity 121, stray light is easily introduced and affects the imaging quality, and the first lens 21 is easily scratched by foreign objects. In order to solve or at least partially alleviate these problems, the lens assembly further includes a protective member, and the lens barrel 10 is provided with a protrusion 111 protruding away from the optical axis L on the light incident side 11. The protective member is provided on the protrusion 111 and extends in a direction perpendicular to the optical axis L to the top of the lens barrel 10 and the pressing member 50 to protect the lens barrel 10, the pressing member 50 and the lens group 20, which can reduce the lens from being damaged by dust, water droplets, scratches or other potential physical damages, and is conducive to extending the service life of the lens assembly. Furthermore, the protective member can be set to be transparent to avoid blocking light, and can also be set with a coating or film for reducing reflection and glare, such as a super black coating, so as to reduce stray light and reflection without blocking light, especially reducing the entry of stray light under strong light and backlight conditions, which is beneficial to reduce glare and ghosting and improve imaging quality.

[0076] The present application can also provide a method for assembling a lens assembly, which comprises the steps of:

[0077] S1. Provide a lens barrel 10, the lens barrel 10 comprising an inner peripheral wall 12, a light incident side 11 and a light emitting side 13, the inner peripheral wall 12 forms a mounting cavity 121 penetrating the light incident side 11 and the light emitting side 13, and the size of the mounting cavity 121 at the light incident side 11 is larger than the size at the light emitting side 13;

[0078] S2. Provide a lens group 20, which is installed in the installation cavity 121 and defines an optical axis L, with the lens located on the light incident side 11 as the first lens 21, the first lens 21 includes a first optical zone 211 and a first structural zone 212 surrounding the first optical zone 211, the first structural zone 212 includes an upper surface 2121 close to the light incident side 11 and a side surface 2122 adjacent to the upper surface 2121, the side surface 2122 abuts against the inner peripheral wall 12 and is interference fit;

[0079] S3, providing a pressing member 50, the pressing member 50 comprising a first pressing surface 521 adapted to abut against the inner peripheral wall 12 of the lens barrel 10, a second pressing surface 531 adapted to abut against the upper surface 2121 of the first lens 21, and a top portion 51 away from the second pressing surface 531, so that the first pressing surface 521 abuts against the inner peripheral wall 12 of the lens barrel 10, and the second pressing surface 531 abuts against the upper surface 2121 of the first lens 21;

[0080] S4. A glue-containing groove 512 is formed between the top 51 of the pressing member 50 and the inner peripheral wall 12 of the lens barrel 10. The pressing member 50 is fixed to the lens barrel 10 by only placing glue in the glue-containing groove 512. The pressing member 50 keeps the lens group 20 installed in the lens barrel 10. The pressing member 50 can limit the position of the first lens 21 in the direction of the optical axis L, and disperse the stress of the side surface 2122 of the first lens 21, thereby reducing the risk of the first lens 21 being broken.

[0081] The present application can also provide a camera module, which includes a lens assembly and a photosensitive assembly, wherein the lens assembly is any of the above lens assemblies, or a lens assembly assembled using the above lens assembly assembly method, and the photosensitive assembly is arranged on the light exit side 13 of the lens assembly. Specifically, the camera module can be an upright camera module, a telephoto camera module or other camera modules.

[0082] In some embodiments, the photosensitive component includes a chip circuit board 62, a photosensitive chip 61 electrically connected to the chip circuit board 62, and at least one electronic component, wherein the photosensitive surface of the photosensitive chip 61 faces the lens assembly to receive light emitted from the optical lens. In a specific example, the photosensitive chip 61 is fixed to the side of the chip circuit board 62 facing the optical lens. At least one electronic component can be implemented as a passive electronic device such as a capacitor, a resistor, or an active electronic device such as a diode, a memory chip, and at least one electronic component can be arranged on the side of the chip circuit board 62 facing the optical lens. In a specific example, the photosensitive chip 61 is electrically connected to the chip circuit board 62 through at least one lead.

[0083] In some examples of the present application, the camera module further includes a filter component, which is arranged on the optical path of the light, and the camera module can filter out unnecessary stray light through the filter component. For example, the filter component is arranged between the lens component and the photosensitive component. In a specific example, the filter component includes a bracket 72 and a filter element 71 fixed to the bracket 72.

[0084] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A lens assembly, characterized in that: include: The lens barrel comprises an inner peripheral wall, a light incident side and a light exit side, wherein the inner peripheral wall forms a mounting cavity penetrating the light incident side and the light exit side, and a size of the mounting cavity at the light incident side is larger than a size at the light exit side; A lens group, the lens group is installed in the installation cavity and defines an optical axis, the lens group includes a first lens located at the light incident side, the first lens includes a first optical zone and a first structural zone surrounding the first optical zone, the first structural zone includes an upper surface close to the light incident side and a side surface adjacent to the upper surface; A pressing member is arranged between the lens barrel and the first lens on the light incident side, the pressing member includes a first pressing surface opposite to the inner circumferential wall of the lens barrel, and a second pressing surface opposite to the upper surface of the first lens, wherein the first pressing surface abuts against the inner circumferential wall of the lens barrel, and the second pressing surface abuts against the upper surface of the first lens; the pressing member keeps the side surface of the first lens interference fitted on the inner circumferential wall of the lens barrel, a buffer groove is arranged at the bottom of the pressing member, the buffer groove is recessed inwardly along the optical axis direction relative to the second pressing surface, and the buffer groove is arranged on the side of the second pressing surface away from the optical axis and is located between the first pressing surface and the second pressing surface.

2. The lens assembly according to claim 1, wherein: The pressing member includes a top, a bottom, an outer portion and an inner portion, the top faces the light incident side, the bottom faces the light exit side, the outer portion faces the inner circumferential wall of the lens barrel, and the inner portion faces the optical axis; wherein the top includes a top surface, the outer portion includes the first pressing surface, the bottom includes the second pressing surface, and the inner portion includes an inner surface.

3. The lens assembly according to claim 2, wherein: The buffer groove includes a groove surface arranged close to the light incident side, and a distance from the groove surface to the top surface is smaller than a distance from the second pressing surface to the top surface.

4. The lens assembly according to claim 2, wherein: A glue groove is formed between the top of the pressing member and the inner peripheral wall of the lens barrel, which is suitable for fixing the pressing member to the lens barrel by only setting glue in the glue groove. The pressing member keeps the lens group installed in the lens barrel.

5. The lens assembly according to claim 2, wherein: The inner surface of the pressing member includes a first area and a second area connected to each other, the first area is connected to the top surface of the pressing member and extends obliquely from the top surface toward the first optical zone of the first lens, the second area is located on the side facing the second pressing surface and opposite to the first structural area of ​​the first lens, the second area is connected to the second pressing surface of the pressing member and extends obliquely from the second pressing surface toward the first optical zone of the first lens to block stray light entering the first lens.

6. The lens assembly according to claim 2, wherein: A dimension of the top surface of the pressing member along a direction perpendicular to the optical axis is greater than a dimension of the second pressing surface along a direction perpendicular to the optical axis.

7. The lens assembly according to any one of claims 2 to 6, characterized in that: The pressing member is made of elastic material, and the first lens is made of glass material.

8. The lens assembly according to claim 1, wherein: The lens group also includes at least one second lens coaxially arranged with the first lens, and the diameters of the lenses in the lens group gradually decrease along the optical axis from the light incident side to the light exit side. A spacer is provided between the first lens and the second lens, and the spacer includes a first supporting surface facing the light incident side and a second supporting surface facing the light exit side, the first supporting surface abuts against the first lens, and the second supporting surface abuts against the second lens.

9. The lens assembly according to claim 1, wherein: The inner circumferential wall of the lens barrel includes a first inner circumferential wall and a second inner circumferential wall, the first inner circumferential wall extends in a direction parallel to the optical axis and abuts against the first pressing surface, the second inner circumferential wall extends in a direction parallel to the optical axis and abuts against the side surface of the first lens, and the diameter of the first inner circumferential wall is greater than the diameter of the second inner circumferential wall.

10. The lens assembly according to claim 1, wherein: A protective member is also included, wherein the lens barrel is provided with a protrusion protruding away from the optical axis on the light incident side, and the protective member is provided on the protrusion and extends in a direction perpendicular to the optical axis to above the lens barrel and the pressing member to protect the lens barrel, the pressing member and the lens group.

11. A method for assembling a lens assembly, characterized in that: Includes steps: S1. Provide a lens barrel, the lens barrel comprising an inner circumferential wall, a light incident side and a light exiting side, the inner circumferential wall forming a mounting cavity penetrating the light incident side and the light exiting side, and a size of the mounting cavity at the light incident side is larger than a size at the light exiting side; S2. Provide a lens group, which is installed in the installation cavity and defines an optical axis, wherein the lens located on the light incident side is a first lens, the first lens includes a first optical zone and a first structural zone surrounding the first optical zone, the first structural zone includes an upper surface close to the light incident side and a side surface adjacent to the upper surface, the side surface abuts against the inner peripheral wall and is interference fit; S3, providing a pressing member, the pressing member comprising a first pressing surface suitable for abutting against the inner circumferential wall of the lens barrel, a second pressing surface suitable for abutting against the upper surface of the first lens, and a top portion away from the second pressing surface, a buffer groove is provided at the bottom of the pressing member, the buffer groove is recessed inwardly along the optical axis direction relative to the second pressing surface, the buffer groove is provided on a side of the second pressing surface away from the optical axis and is located between the first pressing surface and the second pressing surface, so that the first pressing surface abuts against the inner circumferential wall of the lens barrel, and the second pressing surface abuts against the upper surface of the first lens; S4. A glue groove is formed between the top of the pressing member and the inner circumferential wall of the lens barrel. The pressing member is fixed to the lens barrel by setting glue only in the glue groove. The pressing member keeps the lens group installed in the lens barrel.

12. A camera module, characterized in that: It comprises a lens assembly and a photosensitive assembly, wherein the lens assembly is the lens assembly described in any one of claims 1 to 10, or a lens assembly assembled using the lens assembly assembly method described in claim 11, and the photosensitive assembly is arranged on the light-emitting side of the lens assembly.

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