Injection-molded light guide, mobile phone rear camera soft light ring and mobile phone

Abstract

The present invention discloses an injection-molded light guide, a soft light ring for rear camera of a mobile phone, and a mobile phone, which relate to the field of light guide technology, and solve the technical problems that the light source structure of the existing rear camera module of 3C products has poor spatial adaptability and poor light source irradiation quality during shooting; the injection-molded light guide is used in the rear camera module of 3C products, and the injection-molded light guide is generated by an injection molding process, and a plurality of micro-grid structures are provided on the injection-molded light guide, and the grid structure protrudes toward the central axis direction of the injection-molded light guide. If the injection-molded light guide provided by the present invention is prepared by an injection molding process, an injection-molded light guide matching the rear camera module of a mobile phone can be obtained, and a plurality of concave micro-grid structures are provided on the surface of the injection-molded light guide, and the micro-grid structure can change the conduction direction of light in the injection-molded light guide, diffusely reflect light to the outside, so that the light source can be evenly distributed on the injection-molded light guide, and the light is diffusely reflected to the outside to achieve soft fill light.

Description

Technical Field

[0001] The present invention relates to a field, and in particular to an injection-molded light guide, a mobile phone rear camera soft light ring and a mobile phone. Background Art

[0002] The rear camera modules of existing 3C products need to have a certain soft light to achieve lighting and fill light during the rear shooting process. The rear camera modules of current 3C products generally provide lighting and fill light for rear photography by setting up a lighting system, and its implementation usually relies on traditional LED light sources. However, the use of LED light sources has the problem of poor spatial adaptability. At the same time, the light directly projected by the LED light source presents "hard light". The "hard light" will cause obvious shadows and highlight areas during shooting, affecting the image quality. Summary of the invention

[0003] The purpose of the present invention is to provide an injection-molded light guide, a mobile phone rear camera soft light ring and a mobile phone, which solve the technical problems of poor spatial adaptability of the light source structure and poor light source illumination quality during shooting in the rear camera module of existing 3C products.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] In a first aspect, the present invention provides an injection-molded light guide for use in a rear camera module of a 3C product. The injection-molded light guide is produced by an injection molding process. A plurality of micro-dot structures are provided on the injection-molded light guide, and the dot structures protrude toward a central axis direction of the injection-molded light guide.

[0006] Preferably, both ends of the injection-molded light guide are connected to the light source, and the distribution state of the micro-dot structure gradually changes as it moves away from the port;

[0007] When the distribution of the micro-dot structure is such that the number thereof gradually changes with the distance away from the port, there is:

[0008] R (S) =R0*e αS ,

[0009] R (S) is the micro-dot structure density at a distance of S, R0 is the initial micro-dot structure density at the light source end, and α is the rate at which the dot density changes with distance, indicating how fast the dot density grows.

[0010] Preferably, both ends of the injection-molded light guide are connected to the light source, and the distribution state of the micro-dot structure gradually changes with the distance from the port; when the distribution state of the micro-dot structure is that its height gradually changes with the distance from the port, there is:

[0011] h (S) =h1*eβS ;

[0012] h (S) is the height of the micro-dot structure at a distance of S; h1 is the initial micro-dot structure height, and β is the growth rate of the micro-dot structure height as the distance increases.

[0013] Preferably, the first side of the injection-molded light guide is planar and is used to fit onto the back of a mobile phone, and the micro-dot structure is disposed on the first side.

[0014] Preferably, the cross-section of the injection-molded light guide is rectangular, with an aspect ratio of 1.5:1 to 2:1, and a small rounded transition is used at the edge bend of the cross-section.

[0015] Preferably, the injection molding process adopts layered injection molding, and an injection mold with a ring-shaped structure is provided. The injection mold is ring-shaped, and a plurality of tiny protrusions are provided in the inner cavity of the injection mold. The injection molding process includes:

[0016] S1: applying a high reflectivity polymer coating to the inner cavity of the injection mold;

[0017] S2: injecting a first injection amount of the molten matrix into a mold according to a first injection speed to form a first layer of the matrix;

[0018] S3: When the first layer of the matrix is ​​in a semi-solidified state, injecting a second injection amount of the molten matrix into a mold according to a second injection speed to form a second layer of the matrix;

[0019] S4: After controlling the temperature of the injection mold to slowly drop to a certain temperature, the injection molded light guide component is taken out and annealed to obtain the injection molded light guide component.

[0020] In a second aspect, the present invention provides a mobile phone rear camera soft light ring, the mobile phone rear camera soft light ring comprising:

[0021] light source,

[0022] The injection-molded light guide provided in the first aspect above;

[0023] Protective film, attached to the back of the phone;

[0024] A light shielding member, wherein the injection-molded light guide member is disposed between the light shielding member and the protective film;

[0025] The mounting piece is provided with a groove, and the protective film, the injection-molded light guide piece and the light shielding piece are placed in the groove; the mounting piece and the light shielding piece are fixed by bonding;

[0026] The protective film and the mounting member are provided with through holes for the camera to pass through, and the shading member is provided with a light-transmitting area for the camera.

[0027] Preferably, a light-transmitting strip is provided on the light-shielding member, and the light-transmitting strip is formed into a ring shape;

[0028] The light-transmitting strip is used to transmit the light of the injection-molded light guide component to the outside.

[0029] Preferably, the mounting piece is fixed to the back end by bonding.

[0030] In a third aspect, the present invention provides a mobile phone, wherein the back of the mobile phone is provided with any one of the mobile phone rear camera soft light rings provided in the second aspect.

[0031] Compared with the prior art, the present invention has the following beneficial effects: the present invention provides an injection-molded light guide, a soft light ring for the rear camera of a mobile phone, and a mobile phone, which are prepared by an injection-molded light guide using an injection molding process, so that an injection-molded light guide matching the rear camera module of the mobile phone can be obtained. The injection-molded light guide forms a ring-shaped structure on the outside, and the area surrounded by the structure is used to place the camera structure. The ring-shaped injection-molded light guide allows the light source to be distributed around the entire field of view of the camera, so that light can be evenly irradiated to the shooting area of ​​the camera from multiple directions, and the light source is incident from different angles, which can effectively avoid the shadow area caused by irradiation from only a single direction.

[0032] In addition, a plurality of concave micro-dot structures are provided on the surface of the injection-molded light guide, which can change the conduction direction of light in the injection-molded light guide and diffusely reflect the light to the outside, so that the light source can be evenly distributed on the injection-molded light guide, and the light is diffusely reflected to the outside to achieve soft fill light. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0034] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention.

[0035] Figure 1 A schematic diagram of the structure of the injection-molded light guide provided in Example 1;

[0036] Figure 2 The injection molding process flow chart of the injection molding light guide member provided in Example 1;

[0037] Figure 3 A schematic diagram of the structure of a mobile phone rear camera soft light ring provided in Example 1;

[0038] Illustrations: 1. Injection-molded light guide; 11. Micro-dot structure; 2. Protective film; 3. Mounting piece; 31. Groove; 4. Shading piece. DETAILED DESCRIPTION

[0039] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally arranged component at the same time.

[0041] With the rapid development of the market for smart terminal devices (such as smartphones, tablets, etc.), the rear camera module of 3C products has become an important part of the user experience. High-quality rear camera effects rely on good lighting and fill light conditions, especially in low light or complex light environments, where fill light performance directly affects the final image quality.

[0042] At present, many 3C products use LED light sources to achieve lighting and fill light in the rear camera modules. However, the application of traditional LED light sources faces many problems in actual use, including poor spatial adaptability, uneven light distribution and "hard light effect".

[0043] In order to solve the above problems, the present invention proposes an injection molded light guide, a mobile phone rear camera soft light ring and a mobile phone. The injection molded light guide obtained by injection molding guides light and emits light to replace the LED light source in the rear camera module of current 3C products.

[0044] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementations.

[0045] Example 1

[0046] Please refer to Figure 1 An embodiment of the present invention provides an injection-molded light guide 1, which is used in a rear camera module of a 3C product. The injection-molded light guide 1 is produced by an injection molding process, and a plurality of micro-dot structures 11 are provided on the injection-molded light guide 1. The micro-dot structures protrude toward the central axis direction of the injection-molded light guide 1.

[0047] In existing technologies, it is very common to use optical fiber for light guidance and lighting, but the existing optical fiber structures are mostly circular or long strips, and their structural shapes cannot adapt well to the spatial layout of small camera modules. In addition, the traditional optical fiber production process uses vapor deposition and stretching to obtain circular or long strip structures, and the optical fiber produced cannot be used in the rear camera modules of 3C products.

[0048] If the injection molded light guide 1 provided by the present invention is prepared by an injection molding process, an injection molded light guide 1 matching the rear camera module of a mobile phone can be obtained. The injection molded light guide 1 forms a ring-shaped structure on the outside, and the area surrounded by the structure is used to place the camera structure. The ring-shaped injection molded light guide 1 allows the light source to be distributed around the entire field of view of the camera, so that light can be evenly irradiated to the shooting area of ​​the camera from multiple directions, and the light source is incident from different angles, which can effectively avoid the shadow area caused by irradiation from only a single direction.

[0049] In addition, a plurality of concave micro-dot structures 11 are provided on the surface of the injection-molded light guide, which can change the conduction direction of light in the injection-molded light guide and diffusely reflect the light to the outside, so that the light source can be evenly distributed on the injection-molded light guide, and diffusely reflect the light to the outside to achieve soft fill light.

[0050] At the same time, the existing stretching process cannot produce an injection-molded light guide 1 that can match the rear camera module. Therefore, the light guide provided by the present invention is manufactured by an injection molding process, and an injection-molded light guide 1 with a desired structural shape, such as a ring shape, can be obtained.

[0051] Preferably, the cross section of the injection-molded light guide 1 is rectangular, with an aspect ratio of 1.5:1 to 2:1, and a small fillet transition is used at the edge bending portion of the cross section.

[0052] The injection-molded light guide 1 is arranged and installed on the back of a mobile phone or other product, and needs to fit the surface of the back as closely as possible. The cross section of the injection-molded light guide 1 is set to a rectangle (rectangular or square) to better fit the back of the mobile phone. The rectangular structure improves space utilization, facilitates installation and structural integration, and better adapts to the shape of the rear camera module of the current mainstream 3C products.

[0053] A small rounded corner transition is used between two adjacent edges to make the edge more rounded. The small rounded corner can better scatter light from the surface of the light guide, reduce light reflection and optical loss, and at the same time improve the mechanical strength of the injection-molded light guide 1 and reduce the risk of deformation due to stress.

[0054] Preferably, the first side of the injection-molded light guide 1 is planar and is used to fit onto the back of a mobile phone, and the micro-dot structure 11 is disposed on the first side.

[0055] Specifically, the first side is used to fit the back surface of the mobile phone, and the second side opposite to the first side is far away from the back and is used to emit light for supplementary lighting during use.

[0056] A plurality of inwardly recessed micro-dot structures 11 are arranged on the surface of the first side to control the incident angle of the light source entering the injection-molded light guide 1, so that the incident light is totally reflected and partially reflected on the first side, thereby achieving the goal of allowing most of the incident light to continue to be conducted in the injection-molded light guide 1 while part of the light is irradiated from the second side to the external environment.

[0057] Preferably, the first side surface and the second side surface are planes, and the other side surfaces adjacent to the first side surface are arc surfaces.

[0058] In one embodiment, both ends of the injection-molded light guide 1 are connected to the light source, and the distribution state of the micro-dot structure 11 gradually changes as it moves away from the port; when the distribution state of the micro-dot structure 11 is that its height gradually changes as it moves away from the port, there are:

[0059] Formula 1: R (S) =R0*e αS ;

[0060] R (S) is the micro-dot structure density at a distance of S, R0 is the initial micro-dot structure density at the light source end, and α is the rate at which the dot density changes with distance, indicating how fast the dot density grows.

[0061] Specifically, both ends of the light guide are connected to the light source, the light source is introduced from both ends of the injection-molded light guide 1 and is guided through the light guide path, and the light source is controlled from both ends to ensure sufficient incident light.

[0062] The density of micro-dot distribution changes gradually with the distance from the light source port, thereby controlling the distribution characteristics of the light. The above formula 1 shows that the density of the micro-dot structure is dynamically adjusted with the distance from the port, R (S)It represents the density of micro-dot structure at the distance port S. The farther away from the light source port, the greater the dot density. R0 is the initial micro-dot structure density at the light source port. The dot density near the light source port is relatively low. α is the growth rate of dot density with distance, reflecting the speed of increase of dot density. S is the distance along the light guide path from the light source port.

[0063] In one embodiment, both ends of the injection-molded light guide are connected to the light source, and the distribution state of the micro-dot structure gradually changes as it moves away from the port; when the distribution state of the micro-dot structure is that its height gradually changes as it moves away from the port, there is:

[0064] Formula 2: h (S) =h1*e βS ;

[0065] h (S) is the height of the micro-dot structure at a distance of S; h1 is the initial micro-dot structure height, and β is the growth rate of the micro-dot structure height as the distance increases.

[0066] Specifically, h (S) is the height of the micro-dot structure at a distance of S; h1 is the initial micro-dot structure height; β is the growth rate of the micro-dot structure height with distance; S is the distance along the light guide path from the light source port. Formula 2 indicates that the height of the micro-dot structure changes exponentially with distance S from the light source port; by adjusting the parameter β to control the dot height change speed, a smaller dot height is set in the area close to the light source port, and the dot height is gradually increased away from the port area, thereby achieving light scattering and soft fill light.

[0067] The density and height of the micro-dot structure change according to the law of exponential function, so that the incident angle of the light source in the light guide path is gradually adjusted, avoiding the hard light effect of traditional fill light design, enhancing the softness and uniformity of light, thereby significantly improving the imaging quality in weak or dark light environments and enhancing the user's shooting experience.

[0068] Preferably, the distribution of the micro-mesh structure 11 is set using the above formula 1 in combination with the above formula 2.

[0069] In one embodiment, please refer to Figure 2 The injection molding process adopts layered injection molding, and an injection mold with a ring structure is provided. The injection mold is ring-shaped, and a plurality of tiny protrusions are provided in the inner cavity of the injection mold. The injection molding process includes:

[0070] S1: applying a high reflectivity polymer coating to the inner cavity of the injection mold;

[0071] First, the inner cavity surface of the annular injection mold is pretreated, and plasma cleaning or chemical cleaning agents are used to remove oil and impurities on the mold surface to ensure coating adhesion. A high-reflectivity polymer is used to prepare the coating, and the coating consistency is controlled at 50% to 60% to ensure coating uniformity. The coating coating temperature is controlled at 60~80°C. The coating is applied to the bottom of the inner cavity of the injection mold, and the bottom is provided with a plurality of tiny protrusions. The coating is applied to the bottom to form a light-shielding layer on the first side of the injection-molded light guide 1 taken out after the injection molding is completed, which is used to prevent the incident light from passing through the first side and causing waste of light.

[0072] Preferably, the thickness of the light-shielding layer is controlled at 10-20 μm.

[0073] Preferably, the high reflectivity polymer is titanium dioxide (TiO2), which has high reflectivity and good stability.

[0074] Preferably, TiO2 and polyethyl acrylate are used to make the coating so that the light-shielding layer has adhesion and durability.

[0075] Preferably, TiO2 is mixed with silicon (SiO2) and dispersed in a polyester resin or acrylic matrix to prepare a coating, and nanocomposite coating particles of different sizes are introduced into the coating to further enhance the reflective performance and provide more uniform light reflection characteristics.

[0076] Preferably, TiO2 and TiO2 are mixed in a mass ratio of 3:7.

[0077] S2: injecting a first injection amount of the molten matrix into a mold according to a first injection speed to form a first layer of the matrix;

[0078] Specifically, the first injection amount is determined based on the area of ​​the first side surface of the injection-molded light guide 1 and the height data of the micro-dot structure 11 , and the first injection amount can cover the tiny protrusions at the bottom of the injection mold.

[0079] The first injection molding speed is preferably 5-10 mm / s to ensure that the molten matrix has enough time to smoothly fill all tiny raised areas in the mold and ensure the shape integrity and uniformity of the micro-dot structure 11; at the same time, a lower injection molding speed can reduce the probability of bubble formation and improve the optical performance of the light guide.

[0080] PMMA or PC is selected as the light-guiding material for heating and melting treatment to obtain a molten matrix; a first injection amount is injected into the injection mold at a first injection speed to form a first layer of the matrix at the bottom of the inner cavity.

[0081] S3: When the first layer of the matrix is ​​in a semi-solidified state, injecting a second injection amount of the molten matrix into a mold according to a second injection speed to form a second layer of the matrix;

[0082] Specifically, the first substrate material and the second substrate material are the same, which can ensure the reflection path of light to a certain extent. After the injection molding of the first layer of substrate is completed, the temperature of the injection mold is controlled to be 100°C~120°C to slowly reduce the temperature of the first layer of substrate. When the first layer of substrate is in a semi-solidified state, the molten substrate of the second injection amount is injected into the inner cavity according to the second injection speed, and is fused and contacted with the first substrate to form a second substrate. When the first substrate is in a semi-solidified state, the state of the first layer of substrate should be in a stable state, and can be effectively combined with the second substrate to avoid the surfaces of the first substrate and the second substrate not being completely fused, causing light to be damaged during transmission or affecting the reflection path of light.

[0083] The first injection amount is less than the second injection amount, and the first injection speed is less than the second injection speed. Preferably, the second injection speed is 20-25 mm / s.

[0084] The distribution of the tiny protrusion structure at the bottom of the inner cavity is set according to Formula 1 and / or Formula 2 to ensure that the change of the micro-dot structure 11 on the first side of the injection-molded light guide 1 obtained by injection molding is the same as that described in Formula 1 and / or Formula 2.

[0085] S4: After controlling the temperature of the injection mold to slowly drop to a certain temperature, the injection molded light guide component 1 is taken out and annealed to obtain the injection molded light guide component 1 .

[0086] Control the temperature of the injection mold to cool slowly, and slowly reduce the temperature of the injection mold from 100°C~120° to 50°C~60°C. Use a combination of natural cooling and auxiliary cooling system to ensure a uniform temperature gradient.

[0087] After the injection molded light guide 11 is taken out of the mold, the injection molded light guide 1 is relatively soft but not easy to deform. It is placed in an environment (oven or annealing furnace) with a temperature of 80~100°C for annealing. The annealing time is 2~3 hours to completely release the internal stress to obtain the injection molded light guide 1.

[0088] When PMMA is used as the light guide material, the injection molded light guide 1 is slowly heated to 80°C (slightly lower than the glass transition temperature of PMMA, 85°C); the heating rate is controlled at 3-5°C / min to avoid thermal stress caused by rapid heating.

[0089] Preferably, during the process of coating the polymer coating, the mold is maintained at a certain temperature so that the polymer coating can fuse with the first substrate and adhere to the first side. At the same time, the temperature is prevented from being too high, causing the polymer coating to flow along with the first substrate, thereby ensuring the uniformity of the light-shielding layer.

[0090] This embodiment provides an injection molded light guide 1 through a layered injection molding preparation method and by setting tiny protrusions at the bottom of the mold cavity and coating the bottom with a high-reflectivity polymer coating. The injection molded light guide 1 improves light reflection performance by coating the first side with a high-reflectivity polymer coating. The introduction of nanoparticles such as titanium dioxide (TiO2) in the high-reflectivity polymer coating helps to enhance the reflectivity of the light guide, so that most of the incident light is effectively reflected and conducted in the light guide path, thereby improving the light guide efficiency and light guide performance, and ensuring that the camera can still achieve uniform fill light in a dark light environment.

[0091] In the layered injection molding process, the first and second layers of the substrate use different injection speeds and cooling controls, which effectively improves the bonding strength between the layers and the stability of the light guide path. By setting the first injection speed, bubble formation and uneven melt flow can be effectively avoided, ensuring complete filling of the micro-dot area, and improving the mechanical strength of the light guide and the overall molding quality.

[0092] Annealing eliminates the residual stress in the material caused by the molding process, effectively improving the mechanical properties and thermal stability of the light guide, while ensuring the optical consistency and performance stability of the light guide path. This treatment method effectively improves the durability during long-term use and reduces the risk of performance fluctuations caused by stress in the light guide.

[0093] The combination of high-reflectivity coating, micro-dot design, layered injection molding, and annealing process in the injection molding process makes the entire production process highly consistent and stable. The light guide production achieved through injection molding technology has stable quality and high batch production efficiency, which meets the market's large demand for high-performance light guides while reducing production costs. In summary, the injection molding process can effectively achieve the production of light guides with high efficiency, high reflectivity, soft light guide characteristics, strong mechanical stability, and high production consistency, significantly improving the fill light performance and user experience of the rear camera module.

[0094] Example 2

[0095] Please refer to Figure 3 Based on the injection molded light guide 1 described in the above embodiment 1, this embodiment provides a mobile phone rear camera soft light ring, which is used in the mobile phone rear camera module to provide a uniform and soft fill light effect for the mobile phone camera. The mobile phone rear camera soft light ring includes:

[0096] light source,

[0097] The injection-molded light guide member 1 described in the above embodiment 1;

[0098] Protective film 2, attached to the back of the phone;

[0099] A light shielding member 4, wherein the injection-molded light guide member 1 is disposed between the light shielding member 4 and the protective film 2;

[0100] The mounting member 3 is provided with a groove 31, and the protective film 2, the injection-molded light guide member 1 and the light shielding member 4 are placed in the groove 31; the mounting member 3 and the light shielding member 4 are fixed by bonding.

[0101] The protective film 2 and the mounting member 3 are provided with through holes for the camera to pass through, and the light shielding member 4 is provided with a light-transmitting area for the camera.

[0102] Specifically, the injection molded light guide 1 is an annular structure, with its ends being arranged opposite to each other at a certain distance, and a light source being installed between the ports at the ends, and the light source simultaneously injects light into the ports at the ends of the injection molded light guide 1, so that the light is emitted from the second side surface of the injection molded light guide 1 and is conducted along an annular path. The second side surface of the injection molded light guide 1 is a light emitting side, and the surface is in contact with the light shielding member 4, which is used to control the directionality of the light.

[0103] A protective film 2 is provided between the back of the product and the injection-molded light guide 1. The protective film 2 plays a role of mechanical protection and bonding. At the same time, the light guide is stably connected to the back of the mobile phone through a highly light-transmitting material (such as a PET film). The injection-molded light guide 1 is fixed on the protective film 2 by gluing.

[0104] The shading member 4 is attached to the second side surface of the injection molded light guide 1 to shield the light in the non-luminous area to avoid ineffective scattering or leakage of light. The shading member 4 is provided with a position for the camera to transmit light, ensuring that the fill light of the light source does not affect the normal lighting of the camera.

[0105] The mounting member 3 is used to fix the protective film 2, the injection molded light guide 1, and the light shielding member 4 to the back of the mobile phone, and a groove 31 is provided on the side close to the light shielding member 4 to accommodate the protective film 2, the injection molded light guide 1, and the light shielding member 4. The mounting member 3 is fixed to the light shielding member 4 by bonding, and a through hole matching the camera is opened on its surface to ensure that the camera functions normally.

[0106] The injection molded light guide 1 adopts an annular design with a rectangular cross section and a small rounded transition at the edge to enhance the mechanical strength and optical performance of the light guide. The surface of the injection molded light guide 1 is provided with a micro-dot structure 11 whose distribution state changes dynamically, so that the light source is evenly propagated in the annular light guide, and part of the light is scattered to the outside through the second side to provide soft lighting. A highly light-transmitting protective film 2 is arranged between the light guide and the back end of the mobile phone. The material of the protective film 2 is PET film with a light transmittance higher than 90%, and has good wear resistance and bonding performance. The groove 31 of the mounting part 3 accurately accommodates the protective film 2, the injection molded light guide 1 and the light shielding part 4, and is fixed to the light shielding part 4 by a high-strength adhesive to ensure the stability of the component structure. The mounting member 3 and the protective film 2 are provided with a through hole corresponding to the position of the camera, so that the camera in the rear camera module can be installed through the through hole. The shading member 4 is provided with a light-transmitting area, and the light-transmitting area is aligned with the camera for installation; the light-transmitting area on the shading member 4 is transparent, so that external light can pass through the shading member 4 and enter the camera; a through hole is provided on the mounting member 3, and the through hole is aligned with the light-transmitting area, so that external light can enter from the through hole through the shading member 4 and enter the camera.

[0107] Preferably, a light-transmitting strip is provided on the light-shielding member 4, and the light-transmitting strip is formed into a ring shape; the light-transmitting strip is used to transmit the light of the injection-molded light guide member 1 to the outside.

[0108] The light shielding member 4 is a transparent block material, which is light and thin, and can pass light normally without any treatment and has no effect on the light passing through. The light-transmitting strip is arranged at the edge of the light shielding member 4, and an opaque coating is used between the light-transmitting strip and the light-transmitting area to prevent the light of the injection-molded light guide member 1 from affecting the camera shooting when the second side surface of the injection-molded light guide member 1 and the light shielding member 4 are attached.

[0109] The opaque coating can be selected from one of black acrylic coating, black ceramic coating and black optical film.

[0110] The mobile phone rear camera soft light ring provided in this embodiment solves the problems of hard lighting, poor uniformity and insufficient adaptability of equipment space caused by the traditional LED direct fill light method.

[0111] First, the light source enters through the injection-molded light guide 1 at both ends and is evenly transmitted along the annular path. Combined with the dynamic distribution characteristics of the micro-dot structure 11, multi-path scattering and uniform distribution of light are achieved, which greatly improves the illumination uniformity of the fill light area and avoids the problem of local overbrightness or overdarkness.

[0112] Secondly, the annular structure of the injection-molded light guide 1 combined with the light-shielding layer formed by the high-reflectivity polymer coating and the micro-dot structure 11 makes the lighting softer and reduces the hard light effect of traditional LED direct light, thereby significantly improving the shooting quality.

[0113] Finally, the protective film 2 enhances the fit between the light guide and the back of the mobile phone, while avoiding the wear caused by the direct contact between the light guide and the mobile phone shell, thereby improving the durability and mechanical strength of the component; the light shielding member 4 effectively shields unnecessary light and prevents light leakage, further enhancing the accuracy and softness of the fill light direction, while ensuring that the light transmission function of the camera is not affected; the modular design of the mounting member 3 facilitates the rapid installation and replacement of the soft light ring, while improving the spatial adaptability of the device as a whole through the groove 31 and the through hole. The present invention optimizes the mutual cooperation of the light guide, the protective film 2, the light shielding member 4 and the mounting member 3, while achieving efficient and soft fill light, and improving the mechanical stability and optical performance of the soft light ring, thereby meeting the high-quality fill light requirements of the rear camera module of the mobile phone in a weak light environment.

[0114] Example 3

[0115] Based on the above-mentioned embodiment 2, this embodiment provides a mobile phone, and the mobile phone rear camera soft light ring described in the above-mentioned second embodiment is installed on the back of the mobile phone. The mobile phone rear camera soft light ring is used to provide lighting for the rear camera module, while achieving efficient and soft fill light, the mechanical stability and optical performance of the soft light ring are improved, and the high-quality fill light requirements of the mobile phone rear camera module in a low-light environment are met.

[0116] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An injection-molded light guide, used in a rear camera module of a 3C product, characterized in that: The injection-molded light guide is produced by an injection molding process, and a plurality of micro-grid structures are provided on the injection-molded light guide, and the micro-grid structures protrude toward the central axis direction of the injection-molded light guide; Both ends of the injection-molded light guide are connected to the light source, and the density of the micro-dot structure gradually increases as it is farther from the light source port; The first side of the injection-molded light guide is planar and is used to fit on the back of a mobile phone, and the micro-dot structure is arranged on the first side; The injection molding process adopts layered injection molding; an injection mold with a ring structure is provided, the injection mold is ring-shaped, and a plurality of tiny protrusions are provided at the bottom of the inner cavity of the injection mold. The injection molding process includes the following steps: Applying a high reflectivity polymer coating to the inner cavity of the injection mold; Injecting a first injection amount of the molten matrix into a mold at a first injection speed to form a first layer of the matrix, wherein the first injection amount can cover a tiny protrusion at the bottom of the injection mold; When the first layer of substrate is in a semi-solidified state, a second injection amount of the molten substrate is injected into a mold according to a second injection speed to form a second layer of substrate, wherein the first substrate material and the second substrate material are the same; the first injection amount is less than the second injection amount, and the first injection speed is less than the second injection speed; After the temperature of the injection mold is controlled to slowly drop to a certain temperature, the injection molded light guide component is taken out and annealed to obtain the injection molded light guide component.

2. The injection molded light guide according to claim 1, characterized in that: Both ends of the injection-molded light guide are connected to the light source, and the distribution state of the micro-dot structure gradually changes as it moves away from the port; When the distribution state of the micro-grid structure is that the number of micro-grid points gradually changes with the distance from the port, there is: R(S)=R0*e αS, R(S) is the micro-dot structure density at a distance of S, R0 is the initial micro-dot structure density at the light source end, and α is the rate at which the micro-dot density changes with distance.

3. The injection molded light guide according to claim 1, characterized in that: Both ends of the injection-molded light guide are connected to the light source, and the distribution state of the micro-dot structure gradually changes as it moves away from the port; when the distribution state of the micro-dot structure is that its height gradually changes as it moves away from the port, there is: h(S)=h1*e βS ; h(S) is the height of the micro-dot structure at a distance of S; h1 is the initial micro-dot structure height, and β is the growth rate of the micro-dot structure height as the distance increases.

4. The injection molded light guide according to claim 2 or 3, characterized in that: The cross section of the injection-molded light guide is rectangular, with an aspect ratio of 1.5:1 to 2:1, and a small rounded transition is used at the edge bend of the cross section.

5. A mobile phone rear camera soft light ring, characterized in that: The mobile phone rear camera soft light ring comprises: light source, The injection molded light guide according to any one of claims 1 to 4; Protective film, attached to the back of the phone; A light shielding member, wherein the injection-molded light guide member is disposed between the light shielding member and the protective film; The mounting piece is provided with a groove, and the protective film, the injection-molded light guide piece and the light shielding piece are placed in the groove; the mounting piece and the light shielding piece are fixed by bonding; The protective film and the mounting member are provided with through holes for the camera to pass through, and the shading member is provided with a light-transmitting area for the camera.

6. The mobile phone rear camera soft light ring according to claim 5, characterized in that: A light-transmitting strip is arranged on the light-shielding member, and the light-transmitting strip is formed into a ring shape; The light-transmitting strip is used to transmit the light of the injection-molded light guide component to the outside.

7. The mobile phone rear camera soft light ring according to claim 6, characterized in that: The mounting piece is fixed to the back end by bonding.

8. A mobile phone, characterized in that: The back of the mobile phone is provided with a mobile phone rear-camera soft light ring as described in any one of claims 5-7.

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