Methods for manufacturing camera modules, electronic devices, and housing components

Abstract

This application provides a method for manufacturing a camera module, an electronic device, and a housing assembly. The periscope camera module includes a reflective element, a focusing module, a sensor, and a housing assembly. The housing assembly includes at least a cover plate and a dereflectivity film. The cover plate covers at least the reflective element and the focusing module, and has an opening that exposes at least a portion of the light-incident surface of the reflective element. The dereflectivity film is located on the inner surface of the cover plate, and the surface of the dereflectivity film facing away from the inner surface of the cover plate is a non-flat surface. The dereflectivity film includes a base material and an additive material. The base material includes resin, and the additive material is a material with visible light absorption function. By controlling the material of the dereflectivity film, the film effectively absorbs visible light. Simultaneously, the film is modified so that light can be reflected back and forth within the film and cannot escape, effectively reducing the reflectivity of the film and thus achieving a low-cost solution to stray light.

Description

Technical Field

[0001] This application relates to the field of electronic product technology, and in particular to a method for manufacturing a camera module, electronic device, and housing assembly. Background Technology

[0002] Periscope camera module prism components are increasingly used in electronic devices because they can increase the zoom focal length and reduce the size of the camera module in the thickness direction of electronic devices. As users' requirements for the shooting capabilities of electronic devices increase, the requirements for the image clarity of periscope camera modules also increase.

[0003] Existing periscope camera modules suffer from stray light affecting the image clarity. Summary of the Invention

[0004] To address the aforementioned technical problems, this application provides a method for manufacturing a camera module, electronic device, and housing assembly, which can solve the problem of stray light affecting the image clarity of a periscope camera module.

[0005] In a first aspect, this application provides a camera module, which is a periscope camera module. The periscope camera module includes: a reflective element having a light-incident surface for reflecting external light entering through the light-incident surface; a focusing module located on the light-emitting side of the reflective element for focusing the light emitted from the reflective element; a sensor located on the light-emitting side of the focusing module for receiving the light emitted from the focusing module; and a housing assembly including at least a cover plate and an anti-reflectivity film layer. The cover plate covers at least the reflective element and the focusing module, and has an opening that exposes at least a portion of the light-incident surface. The cover plate includes opposing inner and outer surfaces, and the anti-reflectivity film layer is located on the inner surface. The surface of the anti-reflectivity film layer facing away from the cover plate is a non-flat surface. The anti-reflectivity film layer includes a base material and an additive material. The base material includes resin, and the additive material is a material with visible light absorption function.

[0006] Because some light rays, after exiting the focusing module, incident on the inner surface of the cover plate, stray light is generated, affecting the image clarity of the periscope camera module. This application addresses this issue by setting an anti-reflectivity film layer on the inner surface of the cover plate. This anti-reflectivity film layer has a light-absorbing effect, so at least a portion of the light incident on the film layer can be absorbed and not reflected. Furthermore, since the surface of the film layer is not smooth, the light that is not absorbed by the film layer will be reflected back and forth on the smooth surface, preventing the remaining light from incident on the sensor, further reducing the reflectivity of the film layer and effectively avoiding the generation of stray light. In addition, since only the anti-reflectivity film layer, including base materials and additives, needs to be set on the cover plate, the material composition is simple, and no other complex methods are required to process the film layer, resulting in simple process steps and low cost.

[0007] For example, the opening exposing at least a portion of the light-incident surface (i.e., the incident surface) can be understood as the projection of at least a portion of the light-incident surface onto the plane where the cover plate is located overlapping (coinciding, partially overlapping, or one being located within the other).

[0008] For example, a non-flat surface can be understood as a surface on the side of the antireflectivity film away from the cover plate that has been treated to create protrusions and / or depressions. When the surface of the antireflectivity film away from the cover plate has multiple protrusions and depressions, the distance between the highest and lowest points of the surface is larger, further reducing the reflectivity of the film (because the distance between the highest and lowest points of the surface is larger, more light cannot pass through the surface and enter the sensor, further reducing the reflectivity of the film). Of course, the surface may also have only protrusions or only depressions. This application does not limit this.

[0009] For example, when the surface of the antireflectivity film layer facing away from the cover plate includes a protrusion, the protrusion can be cone-shaped. This makes the surface area of ​​the antireflectivity film layer facing away from the cover plate larger, allowing more light to be reflected back and forth on the surface. Therefore, more light cannot pass through the surface and enter the sensor, further avoiding the generation of stray light.

[0010] For example, when the cover and the enclosure are integrally formed, the housing assembly may also include the enclosure, i.e., the housing assembly includes an outer shell (including the cover and the enclosure) and an anti-reflectivity film layer.

[0011] According to the first aspect, the antireflectivity film layer includes a first edge and a second edge opposite each other. At the minimum object distance, the projection of the end of the focusing module away from the reflective element onto the plane where the cover plate is located is flush with the first edge, and the second edge is flush with the edge of the cover plate.

[0012] In other words, one edge of the anti-reflectivity film is flush with the end of the focusing module away from the reflective element, and the other edge is flush with the edge of the cover plate. In this way, wherever the light emitted from the focusing module enters the inner surface of the cover plate, it is covered with a reflectivity film.

[0013] The minimum object distance for a camera module can be understood as the maximum distance between the end of the focusing module away from the reflective element and the sensor; at this point, the focusing module is in a contracted state. In other words, the distance between the end of the focusing module away from the reflective element and the end of the focusing module adjacent to the reflective element is the minimum.

[0014] Of course, the specific location of the anti-reflectivity film layer is not limited to this. It can be set on the entire inner surface of the cover plate, that is, all areas of the inner surface are provided with the anti-reflectivity film layer; or it can be set in only some areas, such as the projection of the end of the focusing module away from the reflective element on the plane of the cover plate being flush with the first edge, and the projection of the side wall of the structural component of the driving device (the device that drives the focusing module to automatically focus) on the plane of the cover plate being flush with the second edge, etc.

[0015] According to the first aspect, or any implementation of the first aspect above, the average reflectance of the antireflectivity film is less than or equal to 0.45% in the visible light band, and the reflectance is the reflectance when light is incident perpendicularly on the antireflectivity film.

[0016] By controlling the material of the antireflectivity film, the average reflectivity of the film is made small in the visible light band, which can effectively absorb visible light. At the same time, the film is modified so that light can be reflected back and forth in the film and cannot escape, further reducing the reflectivity of the film and thus achieving a low-cost solution for stray light.

[0017] For example, the average reflectance of the antireflectivity film in the visible light band includes 0.45%, 0.40%, 0.35%, 0.30%, 0.25%, 0.20%, 0.15%, or 0.10%, etc.

[0018] According to the first aspect, or any implementation of the first aspect above, the average reflectivity of the antireflectivity film is less than or equal to 0.25% in the visible light band.

[0019] It has been verified that when the average reflectance of the antireflectivity film is less than or equal to 0.25% in the visible light band, stray light can be completely eliminated.

[0020] According to the first aspect, or any implementation of the first aspect above, the surface roughness of the surface of the antireflectivity film layer on the side opposite to the inner surface of the cover plate is less than or equal to 20 μm and greater than or equal to 10 μm; and the maximum height is less than or equal to 160 μm and greater than or equal to 100 μm; and the aspect ratio of the surface properties is less than or equal to 0.48; and the arithmetic mean curvature of the peak is less than or equal to 30 / mm and greater than or equal to 20 / mm.

[0021] It has been verified that stray light can be completely eliminated when the surface roughness of the antireflectivity film layer on the side facing away from the inner surface of the cover plate is less than or equal to 20 μm and greater than or equal to 10 μm; the maximum height is less than or equal to 160 μm and greater than or equal to 100 μm; the aspect ratio of the surface properties is less than or equal to 0.48; and the arithmetic mean curvature of the peak is less than or equal to 30 / mm and greater than or equal to 20 / mm.

[0022] According to the first aspect, or any implementation of the first aspect above, the added material includes at least one of carbon black, aqueous silicon oxide, organic solvent, or ester system.

[0023] Of course, the added materials are not limited to at least one of carbon black, aqueous silicon oxide, organic solvent or ester system, as long as they can effectively absorb visible light when combined with the resin, they are within the scope of protection of this application.

[0024] According to the first aspect, or any implementation of the first aspect above, the base material includes at least one of acrylic resin, urethane resin, melamine resin, polyester resin, polyethylene resin, alkyd resin, epoxy resin, acrylic urethane resin, alkyd-melamine resin, silicone resin, modified vinyl acetate resin, maleic anhydride acrylic modified polyolefin resin, or maleic anhydride acrylic modified chlorinated polypropylene resin.

[0025] When the base material is the aforementioned material, its combination with additives can better absorb visible light.

[0026] According to the first aspect, or any of the above implementations of the first aspect, the antireflectivity film layer is composed of the following components in parts by weight: 5 or more parts of additive material and 100 parts of base material.

[0027] By controlling the material of the antireflectivity film, the film can effectively absorb visible light.

[0028] According to the first aspect, or any implementation of the first aspect above, the focusing module includes multiple lenses, the optical axes of the multiple lenses coincide, and are parallel to the plane where the cover plate is located.

[0029] This configuration increases the range of movement of the focusing module's lens along its optical axis, enabling greater zoom magnification and improving shooting effects at greater distances, without increasing the thickness of the electronic device.

[0030] Secondly, embodiments of this application provide an electronic device, which includes the camera module described in the first aspect and any one of the first aspects.

[0031] The second aspect and any implementation thereof correspond to the first aspect and any implementation thereof, respectively. The technical effects of the second aspect and any implementation thereof are similar to those of the first aspect and any implementation thereof, and will not be repeated here.

[0032] Thirdly, embodiments of this application provide a method for preparing a housing assembly, the method comprising:

[0033] A cover plate is provided: the cover plate includes an inner surface; an anti-reflectivity film layer is formed on the inner surface, the anti-reflectivity film layer includes a base material and an additive material, the base material includes a resin, and the additive material is a material with visible light absorption function; the surface of the anti-reflectivity film layer opposite to the cover plate is treated to form a non-flat surface to form a housing assembly.

[0034] When this housing component is applied to a periscope camera module, it can effectively absorb visible light and avoid the generation of stray light. Furthermore, the anti-reflectivity film material of the housing component has a simple composition and does not require any other complex processing methods to treat the film. The process steps are simple and the cost is low.

[0035] It should be noted that when the cover plate and the enclosure are integrally formed (where the cover plate and the enclosure are collectively referred to as the outer shell), providing a cover plate is equivalent to providing an outer shell.

[0036] According to the third aspect, forming an antireflectivity film on the inner surface includes: forming an antireflectivity film on the inner surface by a spraying process.

[0037] This results in a uniform distribution of the antireflectivity film layer, allowing for better absorption of visible light.

[0038] Of course, the process of forming an antireflectivity film is not limited to this. Spin coating or vacuum deposition methods can also be used to form an antireflectivity film on the inner surface.

[0039] According to the third aspect, or any implementation of the third aspect above, the process parameters of the spraying process include: the number of spraying times is less than or equal to 4 and greater than or equal to 1; and the spraying pressure is less than or equal to 0.2 MPa and greater than or equal to 0.1 MPa.

[0040] This process setup, while ensuring the requirements of the film layer, can improve the preparation efficiency of the antireflectivity film layer.

[0041] For example, the number of sprays may include 1, 2, 3, or 4. The spraying pressure may include 0.1 MPa, 0.12 MPa, 0.14 MPa, 0.16 MPa, 0.18 MPa, or 0.2 MPa. Of course, the number of sprays and the spraying pressure are not limited to these.

[0042] According to the third aspect, or any of the above implementations of the third aspect, the surface of the antireflectivity film layer facing away from the inner surface is processed, including: processing the surface of the antireflectivity film layer facing away from the cover plate by laser engraving process.

[0043] This allows the uneven surface of the antireflectivity film to better absorb visible light.

[0044] Of course, the process for treating the side of the antireflectivity film that is away from the inner surface is not limited to this. Etching or laser treatment can also be used to treat the side of the antireflectivity film that is away from the inner surface.

[0045] According to the third aspect, or any of the above implementations of the third aspect, the laser engraving process parameters include: laser engraving speed less than or equal to 1500mm / s and greater than or equal to 800mm / s; laser engraving power less than or equal to 65W and greater than or equal to 45W; laser engraving frequency less than or equal to 100kHz and greater than or equal to 60kHz; and laser engraving line spacing less than or equal to 0.1mm and greater than or equal to 0.01mm.

[0046] For example, laser engraving speeds can include 800mm / s, 900mm / s, 1000mm / s, 1100mm / s, 1200mm / s, 1300mm / s, 1400mm / s, or 1500mm / s, etc. Laser engraving power can include 45W, 50W, 55W, 60W, or 65W, etc. Laser engraving frequency can include 60kHz, 70kHz, 80kHz, 90kHz, or 100kHz, etc. Laser engraving line spacing can include 0.01mm, 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, or 0.1mm, etc. Of course, laser engraving speed, laser engraving power, laser engraving frequency, and laser engraving line spacing are not limited to these.

[0047] According to the third aspect, or any implementation of the third aspect above, the method for preparing the housing component further includes: fusing an additive material in a proportion greater than or equal to 5 parts by weight and a base material in a proportion of 100 parts by weight, and stirring to form an antireflectivity solution; forming an antireflectivity film layer on the inner surface by a spraying process, including: spraying the antireflectivity solution onto the inner surface by a spraying process to form an antireflectivity film layer.

[0048] By controlling the material of the antireflectivity film, the film can effectively absorb visible light.

[0049] According to the third aspect, or any implementation of the third aspect above, the added material includes at least one of carbon black, aqueous silicon oxide, organic solvent, or ester system.

[0050] Of course, the added materials are not limited to at least one of carbon black, aqueous silicon oxide, organic solvent or ester system, as long as they can effectively absorb visible light when combined with the resin, they are within the scope of protection of this application.

[0051] According to the third aspect, or any implementation of the third aspect above, the base material includes at least one of acrylic resin, urethane resin, melamine resin, polyester resin, polyethylene resin, alkyd resin, epoxy resin, acrylic urethane resin, alkyd-melamine resin, silicone resin, modified vinyl acetate resin, maleic anhydride acrylic modified polyolefin resin, or maleic anhydride acrylic modified chlorinated polypropylene resin.

[0052] When the base material is the aforementioned material, its combination with additives can better absorb visible light. Attached Figure Description

[0053] Figure 1 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application;

[0054] Figure 2 for Figure 1 A split view of the electronic device shown;

[0055] Figure 3 This is a schematic diagram of the structure of a camera module provided in an embodiment of this application;

[0056] Figure 4 for Figure 3 The diagram shows the positional relationship of each component in the camera module.

[0057] Figure 5 A schematic diagram of the structure of a shell provided in an embodiment of this application;

[0058] Figure 6This is a schematic diagram of the structure of a reflective element provided in an embodiment of this application;

[0059] Figure 7 An imaging image provided for an embodiment of this application;

[0060] Figure 8 Another imaging pattern provided in the embodiments of this application;

[0061] Figure 9 A diagram showing the positional relationship of various structures in a camera module provided in this application embodiment;

[0062] Figure 10 A partial cross-sectional view of the antireflectivity film provided in the embodiments of this application;

[0063] Figure 11a This is a schematic diagram of another type of housing provided in an embodiment of this application;

[0064] Figure 11b This is a schematic diagram of another type of housing provided in an embodiment of this application;

[0065] Figure 12a This is a schematic diagram of another type of housing provided in an embodiment of this application;

[0066] Figure 12b This is a schematic diagram of another type of housing provided in an embodiment of this application;

[0067] Figure 13 A flowchart illustrating a method for manufacturing a housing assembly as provided in this application embodiment;

[0068] Figure 14a A distribution diagram of the reflectance of an antireflectivity film layer in the visible light range, provided for embodiments of this application;

[0069] Figure 14b Another imaging pattern provided in the embodiments of this application;

[0070] Figure 15a A distribution diagram of the reflectance of an antireflectivity film layer in the visible light range, provided for embodiments of this application;

[0071] Figure 15b Another imaging pattern provided in the embodiments of this application;

[0072] Figure 16a A distribution diagram of the reflectance of an antireflectivity film layer in the visible light range, provided for embodiments of this application;

[0073] Figure 16b Another imaging pattern provided in the embodiments of this application;

[0074] Figure 17aA distribution diagram of the reflectance of an antireflectivity film layer in the visible light range, provided for embodiments of this application;

[0075] Figure 17b This is yet another imaging image provided in the embodiments of this application. Detailed Implementation

[0076] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0077] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0078] The terms "first" and "second," etc., used in the specification and claims of this application are used to distinguish different objects, not to describe a specific order of objects. For example, "first target object" and "second target object," etc., are used to distinguish different target objects, not to describe a specific order of target objects.

[0079] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0080] In the description of the embodiments in this application, unless otherwise stated, "multiple" means two or more. For example, multiple processing units means two or more processing units; multiple systems means two or more systems.

[0081] In the description of the embodiments of this application, "electrical connection" is used to indicate that two or more components can communicate with each other (i.e., can transmit and interact with signals).

[0082] This application provides an electronic device, which may be, for example, a smartphone, tablet computer, laptop computer, in-vehicle computer, personal digital assistant (PDA), smart wearable device (such as a smartwatch or smart bracelet), or smart home device. This application does not limit the form of the electronic device. The following description uses a mobile phone as an example.

[0083] See Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Figure 2 for Figure 1 The exploded view of the electronic device shown shows that the electronic device 100 includes a display module 10, a back cover 20, and a mid-frame 30. The display module 10 and the back cover 20 are disposed opposite to each other, and the mid-frame 30 is located between the display module 10 and the back cover 20.

[0084] Display module 10 is used to display images, videos, etc. Display module 10 may include a light-transmitting cover and a display screen (also called a display panel), with the light-transmitting cover and display screen stacked together. The light-transmitting cover protects the display screen from damage caused by external forces and also provides dust protection. The material of the light-transmitting cover includes, but is not limited to, glass. The display screen may include a Liquid Crystal Display (LCD) screen, an Organic Light Emitting Diode (OLED) screen, and an LED screen, etc. The LED screen may include Micro-LED screens, Mini-LED screens, etc. This application embodiment does not limit the type of display screen.

[0085] The back cover 20 and the mid-frame 30 can be integrally formed; alternatively, they can be formed separately and then fixed together by adhesive, snap-fit, or other methods. The display module 10, mid-frame 30, and back cover 20 can form a complete housing. The housing contains a printed circuit board (PCB) and multiple electronic components (not shown in the figure), including multiple first electronic components and multiple second electronic components. The first electronic components can be mounted on the PCB and electrically connected to it; the second electronic components are not mounted on the PCB but are electrically connected to it, such as through a flexible printed circuit board (FPC) or other connecting devices. The first electronic components may include a system-on-a-chip (SoC), a power management integrated circuit (PMIC), etc., and the second electronic components may include a camera module 40, etc. The back cover 20 and mid-frame 30 protect the PCB and electronic components inside the electronic device 100.

[0086] The camera module 40 is used to capture video or images. The camera module 40 includes a periscope camera module. Of course, when the electronic device 100 includes multiple camera modules 40, the camera module 40 may also include other types of cameras, such as a vertical camera module.

[0087] It is understood that the structures illustrated in the embodiments of this application do not constitute a specific limitation on the electronic device 100. In other embodiments of this application, the electronic device 100 may include more or fewer components than illustrated, or combine certain components, or change the position of components. The illustrated components may be implemented in hardware, software, or a combination of hardware and software.

[0088] See Figure 3 and Figure 4 , Figure 3 This is a schematic diagram of the structure of a camera module provided in an embodiment of this application. Figure 4 for Figure 3 The diagram shows the positional relationship of each structure in the camera module. The periscope camera module 40 includes a housing 41, a reflective element 42, a focusing module 43, a sensor 44, and a signal transmission structure (such as an FPC) 45, etc.

[0089] The housing 41 is used to protect the reflective element 42 and the focusing module 43, etc. (Combined) Figure 5 , Figure 5This is a schematic diagram of the structure of a housing provided in an embodiment of this application. The housing 41 includes a cover plate 411 and a enclosure 413. The enclosure 413 may include a first sidewall 4132 and two second sidewalls 4132 opposite to each other along a first direction. The two second sidewalls 4132 are respectively connected to the two ends of the first sidewall 4132. The first direction may be the length direction of the mobile phone, and the second direction may be the width direction of the mobile phone; or, the first direction may be the length direction of the mobile phone, and the second direction may be the width direction of the mobile phone. That is, the enclosure 413 is a non-closed annular structure, such as a "U" shape. The cover plate 411 is placed on the enclosure 413, so that the cover plate 411 and the enclosure 413 form a non-closed cover. This cover can be placed on the reflective element 42 and the focusing module 43 to protect the reflective element 42 and the focusing module 43. An opening 4111 is formed on the cover plate 411.

[0090] It should be noted that the cover plate 411 can be integrally formed with the enclosure 413, such as through stamping or other processes, which simplifies the manufacturing process of the outer shell 41. Of course, the cover plate 411 and the enclosure 413 can also be set separately and then fixed together by means of gluing, welding, or other methods.

[0091] The reflective element 42 is used to reflect external light onto the focusing module 43. The reflective element 42 may include an optical prism, such as a right-angle prism, combined with... Figure 6 , Figure 6 This is a schematic diagram of a reflective element provided in an embodiment of this application. The right-angle prism may include an incident surface 421, a reflecting surface 422, and an exit surface 423. The opening 4111 on the first cover plate 411 is opposite to the incident surface 421 of the right-angle prism, that is, the opening 4111 on the first cover plate 411 can expose the incident surface 421 of the right-angle prism. In other words, external light can directly enter the incident surface 421 of the right-angle prism through the opening 4111. Specifically, light rays along the thickness direction of the mobile phone enter the reflective element 42 through the incident surface 421 via the opening 4111 on the first cover plate 411. After being reflected by the reflecting surface 422 of the reflective element 42, the transmission path of the light rays is reversed, turning to propagate along the length or width direction of the mobile phone, and then entering the focusing module 43 through the exit surface 423.

[0092] Of course, the reflective element 42 is not limited to an optical prism; any element that can reflect external light onto the focusing module 43 is within the scope of protection of this application.

[0093] The focusing module 43 is located on the light-emitting side of the reflecting element 42, that is, opposite to the emission surface 423, and is used to focus the incident light. The focusing module 43 may include a lens group, which may include multiple lenses. The optical axes of the multiple lenses may coincide and are all parallel to the rear cover 20. Since the optical axis of the focusing module 43 is parallel to the rear cover 20, increasing the range of movement of the lenses of the focusing module 43 along its optical axis can achieve a larger magnification zoom and improve the shooting effect at a greater distance, without increasing the thickness of the electronic device 100. In contrast, in a vertical camera module, the optical axis of the focusing module 43 is perpendicular to the rear cover 20. Increasing the range of movement of the lenses of the focusing module 43 along its optical axis will increase the thickness of the electronic device 100, which is not conducive to the slim design of the electronic device.

[0094] In some embodiments, the periscope camera module 40 further includes a driving device (not shown in the figure) for driving the focusing module 43 to move along its optical axis, thereby realizing the automatic focusing (AF) function of the focusing module 43. The driving device may include a drive motor, etc. The drive motor includes a structural member 46 and a drive module (not shown in the figure) located within the structural member 46, and the focusing module 43 is also located within the structural member 46. The drive module drives the focusing module 43 located within the structural member 46 to move along its optical axis. Exemplarily, the structural member 46 includes at least a bottom wall 461 and a side wall 462, which can be vertically arranged. The bottom wall can support the focusing module 43 and other structures, and the side wall 462 has a through hole 4621. The cover formed by the cover plate 411 and the enclosure 413 can be disposed on the structural member 46 formed by the bottom wall 461 and the side wall 462. For example, if a step is provided at the end of the bottom wall 461 away from the side wall 462, one edge of the cover plate 411 overlaps the step and is fixed to the step by means of adhesive or the like. The outer shell 41 is fixedly connected to the structural member 46 so that the outer shell 41 and the structural member 46 can form a receiving cavity, and the reflective element 42 and the focusing module 43 are located in the receiving cavity. The sensor 44 is located on the light-emitting side of the focusing module 43 and is located outside the receiving cavity, such as on the side of the side wall 462 away from the focusing module 43. The light emitted from the focusing module 43 enters the sensor 44 through the through hole 4621. The sensor 44 is used to convert the light signal incident on its photosensitive surface into an electrical signal that is proportional to the light signal, and convert the electrical signal into an image signal.

[0095] The signal transmission structure 45 is electrically connected to the sensor 44 and is used to transmit the signal converted by the sensor 44 to the SoC on the PCB for processing. Finally, it is converted into an image that can be seen on the display module 10 of the electronic device 100, so as to realize the camera module 40's photo or video recording function.

[0096] In some embodiments, the camera module 40 further includes a bracket (not shown) surrounding the housing 41 to protect the entire camera module 40 and to facilitate fixing the camera module 40 to the whole device cavity.

[0097] The periscope camera module 40 can be operated as follows: external light is incident on the reflective element 42, the reflective element 42 converts the direction of light propagation and reflects the light to the focusing module 43 whose optical axis is parallel to the back cover 20. After the focusing module 43 automatically focuses the light, it is incident on the sensor 44. The sensor 44 converts the light signal into an electrical signal and transmits it to the SoC on the PCB through the signal transmission structure 45.

[0098] While the periscope camera module 40 can achieve greater zoom magnification and improve shooting at greater distances without increasing the thickness of the electronic device 100, it also suffers from stray light during shooting, which severely affects image quality, such as image sharpness.

[0099] Research revealed that when external light is incident perpendicularly onto the incident surface 421 of the reflective element 42, after being reflected by the reflecting surface 422 of the reflective element 42, and then incident again onto the focusing module 43 through the exit surface 423, it can be incident onto the sensor 44 along the optical axis, with the light propagation direction as follows: Figure 4 As shown by the solid arrow in the middle. When external light is incident on the incident surface 421 of the reflective element 42 at a non-perpendicular angle (e.g., the angle between the propagation direction of the external light and the incident surface 421 of the reflective element 42 is 30°), some light will exit through the exit surface 423 of the reflective element 42, while some light will be reflected by the exit surface 423 of the reflective element 42 and then incident on its reflecting surface 422. After being reflected by the reflecting surface 422, it will then be incident on the focusing module 43 through the exit surface 423. At this time, the propagation of the light is not along the optical axis, but has a certain angle (e.g., 30°) with the optical axis. This causes this part of the light to be incident on the inner surface of the cover plate 411 after passing through the focusing module 43. Since the cover plate 411 is generally made of metal, such as iron, it reflects light. Therefore, light incident on the inner surface of the cover plate 411 is reflected and then incident on the sensor 44, resulting in stray light. The direction of light propagation is as follows: Figure 4 As indicated by the dashed arrow.

[0100] To avoid stray light, in one example, a stainless steel coating can be sprayed onto the inner surface of the cover plate 411, which can absorb the light incident on the inner surface of the cover plate 411.

[0101] However, further research revealed that when a stainless steel coating was sprayed onto the inner surface of cover plate 411, significant residual stray light remained. For example... Figure 7 As shown, Figure 7 An imaging image provided in this application embodiment shows that when a periscope camera module 40 is placed in a sealed space and a certain area within the sealed space is photographed, the resulting image contains severe stray light (as shown in area AA), affecting the image clarity.

[0102] In another example, a phosphor bronze film layer can be provided on the inner surface of the cover plate 411, and then the phosphor bronze film layer can be chemically etched to absorb the light incident on the inner surface of the cover plate 411.

[0103] However, further research revealed that while stray light could be improved with this method, a slight residual stray light still remained. For example... Figure 8 As shown, Figure 8 In another imaging example provided by this application, when a periscope camera module is placed in a sealed space and a certain area within that sealed space is photographed, slight stray light (as shown in area BB) appears in the resulting image, affecting the image clarity. Furthermore, the method of setting a phosphor bronze film layer on the inner surface of the cover plate 411 and then chemically etching the phosphor bronze film layer is complex and costly.

[0104] Based on this, this application provides a technical solution by setting a dereflectivity film layer on the inner surface of the cover plate. By controlling the material of the dereflectivity film layer, the film layer can effectively absorb visible light (light in the 380-780nm wavelength range). At the same time, the film layer is modified so that light can be reflected back and forth in the film layer and cannot escape, such as achieving the effect of "light trap", effectively reducing the reflectivity of the film layer, thereby achieving a low-cost solution to stray light.

[0105] The technical solutions provided in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0106] See Figure 9 , Figure 9 This application provides a diagram showing the positional relationship of various structures in a camera module, in accordance with... Figure 8The difference lies in the fact that, in addition to the housing 41, reflective element 42, focusing module 43, sensor 44, and signal transmission structure 45, the periscope camera module 40 also includes an anti-reflectivity film layer 50, which is disposed on the inner surface of the cover plate 411. The anti-reflectivity film layer 50 may include a base material and an additive material. The base material includes resin; the additive material is a material with visible light absorption function. For example, the base material may include at least one of acrylic resin, urethane resin, melamine resin, polyester resin, polyethylene resin, alkyd resin, epoxy resin, acrylic urethane resin, alkyd-melamine resin, silicone resin, modified vinyl acetate resin, maleic anhydride acrylic-modified polyolefin resin, and maleic anhydride acrylic-modified chlorinated polypropylene resin. For example, the additive material includes at least one of carbon black, aqueous silicon oxide, various organic solvents, and ester systems.

[0107] The specific composition of the base material and additives is not limited in the embodiments of this application. In some embodiments, the antireflectivity film layer 50 is composed of the following components in parts by weight: greater than or equal to 5 parts of additives and 100 parts of base material.

[0108] Combination Figure 10 , Figure 10 The partial cross-sectional view of the antireflectivity film layer provided in this application embodiment shows that the surface of the antireflectivity film layer 50 facing away from the cover plate 411 can be processed by laser engraving or other methods to form a non-flat surface on the surface of the antireflectivity film layer 50 facing away from the cover plate 411. That is, along the thickness direction of the mobile phone, the antireflectivity film layer 50 includes a first surface and a second surface facing away from each other. The first surface is in contact with the inner surface of the cover plate 411, and the second surface is located on the side of the first surface facing away from the inner surface of the cover plate 411. The second surface is a non-flat surface. For example, the surface of the antireflectivity film layer 50 facing away from the cover plate 411 (i.e., the second surface) has multiple protrusions; or, the surface of the antireflectivity film layer 50 facing away from the cover plate 411 (i.e., the second surface) has multiple recesses; or, the surface of the antireflectivity film layer 50 facing away from the cover plate 411 (i.e., the second surface) has multiple protrusions and multiple recesses. Figure 10 The explanation is based on the example of a surface with multiple protrusions and depressions on the side of the anti-reflectivity film layer 50 facing away from the cover plate 411.

[0109] It should be noted here that multiple protrusions can be understood as structures protruding from the reference surface; multiple depressions can be understood as structures formed by depressions downward from the reference surface. The reference surface can be the flat surface of the antireflectivity film 50 on the side away from the cover plate 411 when the antireflectivity film 50 has not been treated.

[0110] Because some light rays, after exiting the focusing module 43, will incident on the inner surface of the cover plate 411, stray light is generated, affecting the image clarity of the periscope camera module. This application addresses this by providing an anti-reflectivity film 50 on the inner surface of the cover plate 411. This anti-reflectivity film 50, through material control, has a strong light absorption effect, so at least a portion of the light incident on it can be absorbed and not reflected. Furthermore, since the surface of the anti-reflectivity film 50 facing away from the cover plate 411 is non-flat, the light rays that are not absorbed by the film 50 will reflect back and forth on the non-flat surface, preventing the remaining light from being reflected, further reducing the reflectivity of the anti-reflectivity film 50 and effectively preventing the generation of stray light.

[0111] Furthermore, when the second surface of the antireflectivity film 50 is provided with multiple protrusions and multiple depressions, the distance between the highest point (the point on the second surface of the antireflectivity film 50 that is furthest from the cover plate 411) and the lowest point (the point on the second surface of the antireflectivity film 50 that is furthest from the cover plate 411) is maximized. In this way, more light can be reflected back and forth on the surface and cannot escape, further reducing the reflectivity of the antireflectivity film 50 and thus further avoiding the generation of stray light.

[0112] In some embodiments, the average reflectance of the antireflectivity film 50 in the visible light band is less than or equal to 0.45%, and optionally, the average reflectance of the antireflectivity film 50 in the visible light band is less than or equal to 0.25%, wherein the reflectance is the reflectance when light is incident perpendicularly (i.e., at zero degrees). Furthermore, the surface roughness of the second surface of the antireflectivity film 50 is less than or equal to 20 μm and greater than or equal to 10 μm; the maximum height is less than or equal to 160 μm and greater than or equal to 100 μm; the aspect ratio of the surface properties is less than or equal to 0.48; and the arithmetic mean curvature of the peak is less than or equal to 30 / mm and greater than or equal to 20 / mm. With these settings, stray light can be completely eliminated.

[0113] For example, the average reflectance of the antireflectivity film 50 in the visible light band includes 0.45%, 0.40%, 0.35%, 0.30%, 0.25%, 0.20%, 0.15%, or 0.10%, etc.

[0114] For example, the surface roughness of the surface of the antireflectivity film layer 50 on the side opposite to the cover plate 411 includes 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm or 20 μm, etc.

[0115] For example, the maximum height of the surface of the antireflectivity film layer 50 on the side facing away from the cover plate 411 (the height of the point on the surface of the antireflectivity film layer 50 on the side facing away from the cover plate 411 that is the furthest from the cover plate 411) includes 100μm, 110μm, 120μm, 130μm, 140μm, 150μm or 160μm, etc.

[0116] For example, the aspect ratio of the surface properties of the antireflectivity film layer 50 on the side opposite to the cover plate 411 includes 0.48, 0.47, 0.46, 0.45, 0.44, 0.43, 0.42, 0.41, 0.40, 0.35, 0.3, 0.25 or 0.2, etc.

[0117] For example, the arithmetic mean curvature of the peak of the surface of the antireflectivity film layer 50 on the side opposite to the cover plate 411 includes 20 / mm, 21 / mm, 22 / mm, 23 / mm, 24 / mm, 25 / mm, 26 / mm, 27 / mm, 28 / mm, 29 / mm or 30 / mm, etc.

[0118] The specific location of the antireflectivity film layer 50 is not limited in this embodiment. One possible implementation is described below. Figure 11a , Figure 11a This is a schematic diagram of another housing structure provided in an embodiment of this application. The antireflectivity film layer 50 can be provided on the entire inner surface of the cover plate 411, that is, all areas of the inner surface of the cover plate 411 are provided with the antireflectivity film layer 50. With this arrangement, stray light generated by reflection from the inner surface of the cover plate 411 can be completely avoided.

[0119] In another possible implementation, see [link to relevant documentation]. Figure 11b , Figure 11b This is a schematic diagram of another housing structure provided in an embodiment of this application. Along the first direction, the antireflectivity film layer 50 includes a first edge 51 and a second edge 52 opposite each other. At the minimum object distance, the projection of the end of the focusing module 43 away from the reflective element 42 onto the plane of the cover plate 411 is flush with the first edge 51, and the second edge 52 is flush with the edge of the cover plate 411. Alternatively, the projection of the end of the focusing module 43 away from the reflective element 42 onto the plane of the cover plate 411 is flush with the first edge 51, and the projection of the sidewall 462 of the structural member 46 onto the plane of the cover plate 411 is flush with the second edge 52.

[0120] Combination Figure 4 The minimum object distance can be understood as the maximum distance W1 between the end of the focusing module 43 away from the reflective element 42 and the sensor 44, that is, the minimum distance W2 between the end of the focusing module 43 away from the reflective element 42 and the end of the focusing module 43 adjacent to the reflective element 42. At this time, the focusing module 43 is in a contracted state.

[0121] With such a setting, it can not only save materials, but also avoid stray light generated by the reflection of the light emitted from the focus module 43 on the inner surface of the cover plate 411.

[0122] It can be understood that since there are also structures on the inner surface of the cover plate 411 that need to be connected to structural members of the driving device and the like, when setting the anti-reflection rate film layer 50, this structure needs to be avoided. In this way, the shape of the anti-reflection rate film layer 50 is irregular, such as it can be in the shape of a "convex" character (as Figure 12a shown) or in the shape of a "tu" character (as Figure 12b shown).

[0123] The above content has introduced the material and morphology of the anti-reflection rate film layer 50. Next, in combination with Figure 11b the shown housing, the preparation process of the housing assembly will be described. Among them, in the embodiments of the present application, the housing and the anti-reflection rate film layer can be collectively referred to as the housing assembly. Of course, this does not constitute a limitation to the present application. In other alternative embodiments of the present application, the cover plate and the anti-reflection rate film layer can also be collectively referred to as the housing assembly. The embodiments of the present application take the housing and the anti-reflection rate film layer as the housing assembly as an example for description. Since the preparation method of this housing assembly can be used to prepare the above-mentioned housing and the anti-reflection rate film layer located on the housing, therefore, it has the same beneficial effects as the above content. For the detailed content not described in detail in this embodiment, reference can be made to the embodiments of the above housing assembly.

[0124] Refer to Figure 13 , Figure 13 which is a flowchart of a preparation method of a housing assembly provided by an embodiment of the present application. As Figure 13 shown, the steps of the preparation method of the housing assembly provided by the embodiment of the present application specifically include:

[0125] S101. Provide a housing.

[0126] Continue to refer to Figure 5 , the housing includes a cover plate 411 and a围挡 413. Among them, the围挡 413 includes a first side wall 4131 and two second side walls 4132.

[0127] The cover plate 411 and the围挡 413 can be integrally formed.

[0128] For example, the housing can be prepared by processes such as stamping, deburring, and cleaning.

[0129] S102. Blend the additive material and the base material and stir to form an anti-reflection rate solution.

[0130] In this process, 5 parts by weight of additives and 100 parts by weight of base materials are mixed and stirred to form an antireflectivity solution. The antireflectivity solution can be black, in which case it can also be called black paint.

[0131] S103. The anti-reflectivity solution is sprayed onto the inner surface of the cover plate through a spraying process to form an anti-reflectivity film layer.

[0132] See also Figure 11a and Figure 11b An anti-reflectivity solution is sprayed onto the inner surface of the cover plate 411 using a spraying process to form an anti-reflectivity film layer 50.

[0133] During spraying, process parameters such as spraying pressure, number of sprays, distance between the sprayer and the inner surface of the cover plate 411, spraying concentration, and moving speed during spraying can be adjusted adaptively.

[0134] For example, the number of spraying passes can be less than or equal to 4 and greater than or equal to 1. For instance, the number of spraying passes can include 1, 2, 3, or 4 passes, etc.

[0135] For example, the spraying pressure can be less than or equal to 0.2 MPa and greater than or equal to 0.1 MPa. For instance, the spraying pressure can include 0.1 MPa, 0.12 MPa, 0.14 MPa, 0.16 MPa, 0.18 MPa, or 0.2 MPa, etc.

[0136] S104. The surface of the anti-reflectivity film layer facing away from the cover plate is treated by laser engraving to form the housing assembly.

[0137] See also Figure 10 The surface of the antireflectivity film layer 50 facing away from the cover plate 411 is treated by laser engraving to form an uneven surface. For example, the surface of the antireflectivity film layer 50 facing away from the cover plate 411 has multiple protrusions and multiple depressions. The shape of the protrusions may include cones, etc.

[0138] During laser engraving, process parameters such as laser engraving speed, laser engraving power, frequency, and line spacing can be adjusted.

[0139] For example, the laser engraving speed is less than or equal to 1500 mm / s and greater than or equal to 800 mm / s. Laser engraving speeds may include 800 mm / s, 900 mm / s, 1000 mm / s, 1100 mm / s, 1200 mm / s, 1300 mm / s, 1400 mm / s, or 1500 mm / s, etc.

[0140] For example, the laser engraving power is less than or equal to 65W and greater than or equal to 45W. For instance, the laser engraving power can include 45W, 50W, 55W, 60W, or 65W, etc.

[0141] For example, the laser engraving frequency is less than or equal to 100 kHz and greater than or equal to 60 kHz. For instance, the laser engraving frequency may include 60 kHz, 70 kHz, 80 kHz, 90 kHz, or 100 kHz, etc.

[0142] For example, the laser engraving line spacing is less than or equal to 0.1mm and greater than or equal to 0.01mm. For instance, the laser engraving line spacing may include 0.01mm, 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, or 0.1mm, etc.

[0143] Understandably, after processing the surface of the antireflectivity film layer 50 on the side opposite to the cover plate 411 using laser engraving, the housing components can also be cleaned and inspected to remove dust and check whether the surface meets the requirements.

[0144] Once the housing assembly is manufactured, it can be assembled with the structural components of the drive device to form the periscope camera module 40 described above.

[0145] When the housing component prepared by the above method is applied to the periscope camera module, it can effectively absorb visible light and avoid the generation of stray light. Moreover, the anti-reflectivity film material of the housing component has a simple composition and does not require any other complicated means to process the film. The process steps are simple and the cost is low.

[0146] Furthermore, process parameters such as spraying pressure, number of sprays, distance between the sprayer and the inner surface of the cover plate, spraying density, and spraying speed can be adaptively adjusted, as can laser engraving speed, laser engraving power, frequency, and line spacing to obtain the desired antireflectivity film 50. When adjusting the laser engraving power and line spacing in the laser engraving process, the changes in the average reflectivity of the antireflectivity film 50 in the visible light band, as well as the surface roughness, maximum height, aspect ratio of the surface properties, and arithmetic mean curvature of the peak vertices of the antireflectivity film 50, are most significant.

[0147] The effects of the housing assembly provided in the embodiments of this application will be explained below with specific examples. The examples below are based on adjustments made only to the laser engraving power and laser line spacing in the laser engraving process (because when the laser engraving power and laser line spacing are adjusted, the changes in the average reflectivity of the antireflectivity film 50 in the visible light band and the surface roughness, maximum height, aspect ratio of the surface properties, and arithmetic mean curvature of the peaks of the antireflectivity film 50 are most significant).

[0148] In one example, the shell component is formed through the following steps:

[0149] First, a black paint is prepared by fusing a solution of carbon black additive in a ratio of 5 parts by weight or more and modified vinyl acetate resin as the base material in a ratio of 100 parts by weight, and stirring. Then, on the above-mentioned outer shell ( Figure 5 Black paint is sprayed onto the inner surface of the cover plate 411 using a spraying process, with two spraying passes at a pressure of 0.2 MPa, to form an anti-reflectivity film layer 50. Next, the surface of the anti-reflectivity film layer 50 facing away from the cover plate 411 is treated using a laser engraving process, with a laser engraving speed of 1500 mm / s, a power of 55 W, a frequency of 80 kHz, and a line spacing of 0.03 mm, to form the housing assembly.

[0150] By limiting the above-mentioned main process parameters during the fabrication of the housing assembly, an antireflectivity film 50 can be obtained with a reflectivity value of 0.1% to 0.25% in the 380–780 nm wavelength range (average reflectivity of 0.2% in the 380–780 nm wavelength range), a surface roughness of 11 μm, a maximum height of 127 μm, an aspect ratio of 0.3 for the surface properties, and an arithmetic mean curvature of 24 / mm at the peak apex.

[0151] See Figure 14a and Figure 14b , Figure 14a This application provides a distribution diagram of the reflectance of an antireflectivity film in the visible light range, as shown in the embodiments of this application. Figure 14b This is yet another imaging image provided in the embodiments of this application. Figure 14a The horizontal axis in the graph represents the various wavelengths of visible light. Figure 14b The vertical axis represents the average reflectance of the antireflectivity film in the 380–780 nm wavelength range. Figure 14a It can be seen that the antireflectivity film 50 formed through the above materials and steps has an average reflectivity of 0.2% in the 380–780 nm wavelength range. Figure 14bIt is known that when this housing component is applied to the periscope camera module, the periscope camera module is placed in a sealed space, and when a certain area in the sealed space is photographed, stray light in the resulting image can be completely eliminated.

[0152] In yet another example, the housing assembly is formed through the following steps:

[0153] First, a black paint is prepared by fusing a solution of carbon black additive in a ratio of 5 parts by weight or more and maleic anhydride acrylic-modified chlorinated polypropylene resin as the base material in a ratio of 100 parts by weight, and stirring. Then, on the above-mentioned outer shell ( Figure 5 Black paint is sprayed onto the inner surface of the cover plate 411 using a spraying process, with two spraying passes at a pressure of 0.2 MPa, to form an anti-reflectivity film layer 50. Next, the surface of the anti-reflectivity film layer 50 facing away from the cover plate 411 is treated using a laser engraving process, with a laser engraving speed of 1500 mm / s, a power of 55 W, a frequency of 80 kHz, and a line spacing of 0.1 mm, to form the housing assembly.

[0154] By limiting the above-mentioned main process parameters during the fabrication of the housing assembly, an antireflectivity film layer 50 can be obtained with a reflectivity value of 0.25% to 0.32% (average reflectivity of 0.3% in the 380–780 nm wavelength range), a surface roughness of 10 μm, a maximum height of 107 μm, an aspect ratio of 0.27, and an arithmetic mean curvature of 21.3 / mm at the peak apex.

[0155] See Figure 15a and Figure 15b , Figure 15a This application provides a distribution diagram of the reflectance of an antireflectivity film in the visible light range, as shown in the embodiments of this application. Figure 15b This is yet another imaging image provided in the embodiments of this application. Figure 15a The horizontal axis in the graph represents the various wavelengths of visible light. Figure 15b The vertical axis represents the average reflectance of the antireflectivity film in the 380–780 nm wavelength range. Figure 15a It can be seen that the antireflectivity film 50 formed through the above materials and steps has an average reflectivity of 0.3% in the 380–780 nm wavelength range. Figure 15b It can be seen that when the housing component is applied to the periscope camera module, the stray light in the image formed when the periscope camera module is placed in a sealed space and a certain area in the sealed space is photographed can be basically eliminated.

[0156] In yet another example, the housing assembly is formed through the following steps:

[0157] First, a black paint is prepared by mixing and stirring a solution of carbon black additive in a ratio of 5 parts by weight or more and an acrylic resin-based material in a ratio of 100 parts by weight. Then, on the above-mentioned outer shell ( Figure 5 Black paint is sprayed onto the inner surface of the cover plate 411 using a spraying process, with two spraying passes at a pressure of 0.2 MPa, to form an anti-reflectivity film layer 50. Next, the surface of the anti-reflectivity film layer 50 facing away from the cover plate 411 is treated using a laser engraving process, with a laser engraving speed of 1500 mm / s, a power of 55 W, a frequency of 80 kHz, and a line spacing of 0.03 mm, to form the housing assembly.

[0158] By limiting the above-mentioned main process parameters during the fabrication of the housing assembly, an antireflectivity film layer 50 can be obtained with a reflectivity value of 0.2% to 0.26% (average reflectivity of 0.25% in the 380–780 nm wavelength range), a surface roughness of 17.8 μm, a maximum height of 156 μm, an aspect ratio of 0.32, and an arithmetic mean curvature of 28.9 mm at the peak apex.

[0159] See Figure 16a and Figure 16b , Figure 16a This application provides a distribution diagram of the reflectance of an antireflectivity film in the visible light range, as shown in the embodiments of this application. Figure 16b This is yet another imaging image provided in the embodiments of this application. Figure 16a The horizontal axis in the graph represents the various wavelengths of visible light. Figure 16b The vertical axis represents the average reflectance of the antireflectivity film in the 380–780 nm wavelength range. Figure 16a It can be seen that the antireflectivity film 50 formed through the above materials and steps has an average reflectivity of 0.25% in the 380–780 nm wavelength range. Figure 16b It can be seen that when the housing component is applied to the periscope camera module, the periscope camera module is placed in a sealed space, and when a certain area in the sealed space is photographed, stray light in the resulting image is basically eliminated.

[0160] In yet another example, the housing assembly is formed through the following steps:

[0161] First, a black paint is prepared by mixing and stirring a solution of carbon black additive in a ratio of 5 parts by weight or more and alkyd-melamine resin as the base material. Then, on the above-mentioned outer shell ( Figure 5 Black paint is sprayed onto the inner surface of the cover plate 411 using a spraying process, with two spraying passes at a pressure of 0.2 MPa, to form an anti-reflectivity film layer 50. Next, the surface of the anti-reflectivity film layer 50 facing away from the cover plate 411 is treated using a laser engraving process, with a laser engraving speed of 1500 mm / s, a power of 45 W, a frequency of 80 kHz, and a line spacing of 0.1 mm, to form the housing assembly.

[0162] By limiting the above-mentioned main process parameters during the fabrication of the housing assembly, an antireflectivity film layer 50 can be obtained with a reflectivity value of 0.28% to 0.36% (average reflectivity of 0.35% in the 380–780 nm wavelength range), a surface roughness of 10.4 μm, a maximum height of 113.7 μm, an aspect ratio of 0.31, and an arithmetic mean curvature of 24.7 mm at the peak apex.

[0163] See Figure 17a and Figure 17b , Figure 17a This application provides a distribution diagram of the reflectance of an antireflectivity film in the visible light range, as shown in the embodiments of this application. Figure 17b This is yet another imaging image provided in the embodiments of this application. Figure 17a The horizontal axis in the graph represents the various wavelengths of visible light. Figure 17b The vertical axis represents the average reflectance of the antireflectivity film in the 380–780 nm wavelength range. Figure 17a It can be seen that the antireflectivity film 50 formed through the above materials and steps has an average reflectivity of 0.35% in the 380–780 nm wavelength range. Figure 17b It is known that when the housing component is applied to the periscope camera module, the periscope camera module is placed in a sealed space, and when a certain area in the sealed space is photographed, the resulting image contains slight stray light.

[0164] Depend on Figures 14a-17bIt can be seen that by controlling the material of the antireflectivity film layer 50, and by setting the antireflectivity film layer 50 on the inner surface of the cover plate 411 through a spraying process, and by performing laser engraving on the surface of the antireflectivity film layer 50, and by adaptively adjusting process parameters such as laser engraving power and line spacing to obtain an antireflectivity film layer 50 that meets the requirements (i.e., reflectivity, surface roughness, maximum height, height ratio of surface properties, and arithmetic mean curvature of the peak vertices all meet the requirements), a low-cost stray light solution can be achieved.

[0165] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A camera module, wherein the camera module is a periscope camera module, characterized in that, include: A reflective element having an incident surface for reflecting external light rays entering through the incident surface; The focusing module is located on the light-emitting side of the reflective element and is used to focus the light emitted from the reflective element. A sensor, located on the light-emitting side of the focusing module, is used to receive the light emitted from the focusing module; The housing assembly includes at least a cover plate and an anti-reflectivity coating; The cover plate is at least covered on the reflective element and the focusing module, and the cover plate has an opening that exposes at least a portion of the light-incident surface. The cover plate includes opposing inner and outer surfaces, the anti-reflectivity film is located on the inner surface, and the surface of the anti-reflectivity film facing away from the cover plate is a non-flat surface. The antireflectivity film layer comprises a base material and an additive material. The base material includes a resin, and the additive material is a material that has the function of absorbing visible light.

2. The camera module according to claim 1, characterized in that, The antireflectivity film includes a first edge and a second edge opposite each other; at the minimum object distance, the projection of the end of the focusing module away from the reflective element onto the plane of the cover plate is flush with the first edge, and the second edge is flush with the edge of the cover plate.

3. The camera module according to claim 1 or 2, characterized in that, The surface of the antireflectivity film layer opposite to the cover plate has multiple protrusions and multiple depressions to form the non-flat surface.

4. The camera module according to claim 3, characterized in that, The protrusion is cone-shaped.

5. The camera module according to any one of claims 1-4, characterized in that, The antireflectivity film has an average reflectivity of less than or equal to 0.45% in the visible light band, and the reflectivity is the reflectivity when light is incident perpendicularly on the antireflectivity film.

6. The camera module according to claim 5, characterized in that, The antireflectivity film has an average reflectivity of less than or equal to 0.25% in the visible light band.

7. The camera module according to any one of claims 1-6, characterized in that, The surface roughness of the antireflectivity film layer on the side facing away from the cover plate is less than or equal to 20 μm and greater than or equal to 10 μm; and the maximum height is less than or equal to 160 μm and greater than or equal to 100 μm. Furthermore, the aspect ratio of the surface features is less than or equal to 0.48; and the arithmetic mean curvature of the peak apex is less than or equal to 30 / mm and greater than or equal to 20 / mm.

8. The camera module according to any one of claims 1-7, characterized in that, The additives include at least one of carbon black, aqueous silicon oxide, organic solvent, or ester system.

9. The camera module according to any one of claims 1-8, characterized in that, The base material includes at least one of the following: acrylic resin, urethane resin, melamine resin, polyester resin, polyethylene resin, alkyd resin, epoxy resin, acrylic urethane resin, alkyd-melamine resin, silicone resin, modified vinyl acetate resin, maleic anhydride acrylic-modified polyolefin resin, or maleic anhydride acrylic-modified chlorinated polypropylene resin.

10. The camera module according to any one of claims 1-9, characterized in that, The antireflectivity film is composed of the following components in parts by weight: 5 or more parts of additive material and 100 parts of base material.

11. The camera module according to any one of claims 1-10, characterized in that, The focusing module includes multiple lenses, the optical axes of which coincide and are parallel to the plane of the cover plate.

12. An electronic device, characterized in that, Includes the camera module as described in any one of claims 1-11.

13. A method for preparing a housing assembly, characterized in that, The method for preparing the housing assembly includes: A cover plate is provided: the cover plate includes an inner surface; An antireflectivity film is formed on the inner surface. The antireflectivity film includes a base material and an additive material. The base material includes a resin, and the additive material is a material with visible light absorption function. The surface of the antireflectivity film layer facing away from the cover plate is processed to form a non-flat surface, thereby forming the housing assembly.

14. The method for preparing the housing assembly according to claim 13, characterized in that, An anti-reflectivity film layer is formed on the inner surface, comprising: An anti-reflectivity film is formed on the inner surface by a spraying process.

15. The method for preparing the housing assembly according to claim 14, characterized in that, The process parameters of the spraying process include: the number of spraying times is less than or equal to 4 and greater than or equal to 1; and the spraying pressure is less than or equal to 0.2 MPa and greater than or equal to 0.1 MPa.

16. The method for preparing the housing assembly according to any one of claims 13-15, characterized in that, The surface of the antireflectivity film layer facing away from the cover plate is treated, including: The surface of the antireflectivity film layer facing away from the cover plate is treated using laser engraving.

17. The method for preparing the housing assembly according to claim 16, characterized in that, The process parameters of the laser engraving process include: The laser engraving speed is less than or equal to 1500 mm / s and greater than or equal to 800 mm / s; the laser engraving power is less than or equal to 65W and greater than or equal to 45W; the laser engraving frequency is less than or equal to 100 kHz and greater than or equal to 60 kHz; and the laser engraving line spacing is less than or equal to 0.1 mm and greater than or equal to 0.01 mm.

18. The method for preparing the housing assembly according to claim 14, characterized in that, The method for preparing the shell assembly further includes: fusing an additive material in a proportion greater than or equal to 5 parts by weight and a base material in a proportion of 100 parts by weight, and stirring to form a dereflectivity solution; An anti-reflectivity film layer is formed on the inner surface by a spraying process, including: The antireflectivity solution is sprayed onto the inner surface using a spraying process to form an antireflectivity film layer.

19. The method for preparing the housing assembly according to claim 18, characterized in that, The additives include at least one of carbon black, aqueous silicon oxide, organic solvent, or ester system.

20. The method for preparing the housing assembly according to claim 18, characterized in that, The base material includes at least one of the following: acrylic resin, urethane resin, melamine resin, polyester resin, polyethylene resin, alkyd resin, epoxy resin, acrylic urethane resin, alkyd-melamine resin, silicone resin, modified vinyl acetate resin, maleic anhydride acrylic-modified polyolefin resin, or maleic anhydride acrylic-modified chlorinated polypropylene resin.

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