Light-transmitting assembly, camera module and electronic device

Abstract

The application discloses a light-transmitting assembly, a camera module and an electronic device. The light-transmitting assembly comprises a light-transmitting base material, an ink layer and an anti-reflection film. The light-transmitting base material has an incident surface and an emitting surface. The ink layer is arranged on the circumferential edge of the incident surface and / or the circumferential edge of the emitting surface. The anti-reflection film is arranged on the ink layer, and the ink layer is located between the light-transmitting base material and the anti-reflection film.

Description

Technical Field

[0001] This application relates to the field of camera module technology, specifically to a light-transmitting component, a camera module, and an electronic device. Background Technology

[0002] Periscope lenses were developed to create thinner digital cameras with optical zoom by converting the depth required for zoom lenses into a vertical or horizontal orientation, thereby reducing the thickness of the camera body.

[0003] Periscope lenses in related technologies have drawbacks in image quality. In prism modules, an anti-reflective film is coated on the prism surface, and then an ink layer is screen-printed on the film surface. The ink's function is to block light. Ink surface testing shows that the prism module has low reflectivity, but the reflectivity from the substrate surface inside the prism module is high, leading to stray light risk and affecting image quality. Summary of the Invention

[0004] This application aims to provide a light-transmitting component, a camera module, and an electronic device, which at least solves the problem of stray light risk in periscope lenses in related technologies, affecting the imaging effect.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] In a first aspect, embodiments of this application provide a light-transmitting component, comprising:

[0007] A light-transmitting substrate, which has an incident surface and an exit surface;

[0008] An ink layer is disposed on the circumferential edge of the incident surface and / or the circumferential edge of the exit surface;

[0009] An antireflective film is disposed on an ink layer, which is located between a light-transmitting substrate and an antireflective film.

[0010] Secondly, embodiments of this application propose a camera module, including:

[0011] Such as the light-transmitting component in the first aspect.

[0012] Thirdly, embodiments of this application propose an electronic device, including:

[0013] Such as the camera module in the second aspect.

[0014] In the embodiments of this application, a scheme for improving the internal reflectivity of a light-transmitting component is provided. In related technologies, a light-transmitting component is a structure consisting of a substrate, a film layer, and an ink layer stacked sequentially. In this case, the external reflectivity is the reflectivity of the ink layer, and the internal reflectivity is the equivalent reflectivity of the substrate, ink layer, and film layer. In this embodiment, the stacked structure of the light-transmitting component is a light-transmitting substrate, an ink layer, and an anti-reflection film. The external reflectivity is the combined equivalent reflection of the ink layer and the anti-reflection film, and the internal reflectivity is the equivalent reflectivity of the light-transmitting substrate and the ink layer. Actual testing shows that the equivalent reflectivity of the light-transmitting substrate and the ink layer in this embodiment is lower than the equivalent reflectivity of the substrate, ink layer, and film layer in related technologies, thus improving the photographic effect of stray light.

[0015] In this embodiment, the stacking sequence is clearly defined as follows: first, an ink layer is applied to the circumferential edge of the light-transmitting substrate, and then an anti-reflection film is deposited on the surface of the ink structure. In this embodiment, the internal reflectivity of the light-transmitting component is equivalent to the reflectivity of the ink layer plus the light-transmitting substrate, which can reduce the internal reflectivity of the light-transmitting component, thereby avoiding stray light risks and ensuring the imaging effect of the camera module.

[0016] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 This is a schematic diagram of the structure of a light-transmitting component according to an embodiment of this application;

[0019] Figure 2 This is a schematic diagram of the structure of a camera module according to an embodiment of this application;

[0020] Figure 3 This is a schematic diagram of the structure of a prism according to an embodiment of this application;

[0021] Figure 4 A graph showing the internal reflectivity of a light-transmitting component as a function of wavelength is shown in the related technology.

[0022] Figure 5 A graph showing the external reflectivity of a light-transmitting component as a function of wavelength is presented in the related technology.

[0023] Figure 6 A graph showing the internal reflectivity of the light-transmitting component as a function of wavelength in an embodiment of this application is shown.

[0024] Figure 7 A graph showing the external reflectivity of the light-transmitting component in an embodiment of this application as a function of wavelength is shown.

[0025] Figure 8 A schematic diagram of the thin-film interference principle is shown;

[0026] Figure 9 A schematic diagram showing the variation of amplitude with optical path length is shown.

[0027] Figure label:

[0028] 100 Light-transmitting component, 110 Light-transmitting substrate, 111 Prism, 112 Lens, 120 Ink layer, 121 Incident surface, 122 Exit surface, 123 Reflective surface, 130 Anti-reflective coating, 200 Photosensitive chip, 300 Housing. Detailed Implementation

[0029] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0030] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0031] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] The following is combined Figures 1-9 This application describes a light-transmitting component, a camera module, and an electronic device according to embodiments thereof.

[0033] Combination Figure 1 and Figure 2As shown, according to some embodiments of this application, a light-transmitting component 100 includes a light-transmitting substrate 110, an ink layer 120, and an anti-reflection film 130. The light-transmitting substrate 110 has an incident surface 121 and an exit surface 122. The ink layer 120 is disposed on the circumferential edge (arrow pointing at c1) of the incident surface 121 and / or the circumferential edge (arrow pointing at c2) of the exit surface 122. The anti-reflection film 130 is disposed on the ink layer 120 and is located between the light-transmitting substrate 110 and the anti-reflection film 130.

[0034] The light-transmitting substrate 110 is light-transmitting, and light can pass through the light-transmitting substrate 110. Specifically, the light enters the light-transmitting substrate 110 through the incident surface 121 and exits through the exit surface 122.

[0035] An ink layer 120 can be provided on the circumferential edge of the incident surface 121 or the circumferential edge of the exit surface 122, or an ink layer 120 can be provided on both the circumferential edge of the incident surface 121 and the circumferential edge of the exit surface 122, and then an antireflection film 130 can be deposited on the surface of the ink structure.

[0036] This embodiment provides a solution for improving the internal reflectivity of a light-transmitting component 100. In related technologies, the light-transmitting component 100 is a structure consisting of a substrate, a film layer, and an ink layer stacked sequentially. In this case, the external reflectivity is the reflectivity of the ink layer, and the internal reflectivity is the equivalent reflectivity of the substrate, ink, and film layer. In this embodiment, the stacked structure of the light-transmitting component 100 is a light-transmitting substrate 110, an ink layer 120, and an anti-reflection film 130. The external reflectivity is the combined equivalent reflection of the ink layer 120 and the anti-reflection film 130, and the internal reflectivity is the equivalent reflectivity of the light-transmitting substrate 110 and the ink layer 120. Actual testing shows that the equivalent reflectivity of the light-transmitting substrate 110 and the ink layer 120 in this embodiment is lower than the equivalent reflectivity of the substrate, ink, and film layer in related technologies, thus improving the photographic effect of stray light.

[0037] In this embodiment, the stacking sequence is specified as follows: first, an ink layer 120 is applied to the circumferential edge of the light-transmitting substrate 110, and then an anti-reflection film 130 is deposited on the surface of the ink structure. In this embodiment, the internal reflectivity of the light-transmitting component 100 is equivalent to the reflectivity of the ink layer 120 plus the reflectivity of the light-transmitting substrate 110, which can reduce the internal reflectivity of the light-transmitting component 100, thereby avoiding stray light risks and ensuring the imaging effect of the camera module.

[0038] The processing technology of ink layer 120 can be screen printing, spraying, dipping, or pad printing. In the above embodiment, the reflectivity of ink layer 120 itself is less than 1%. In other embodiments, ink layer 120 is not limited to the above reflectivity. The reflectivity of ink layer 120 is lower than that of light-transmitting substrate 110.

[0039] The solution to reduce internal reflectivity can be implemented on the incident surface 121 or on the exit surface 122. The light is reflected by the photosensitive chip or lens 112 to the prism 111, which can improve the reflection of light to the incident surface 121 or the exit surface 122 of the prism 111 and reduce the reflectivity more effectively.

[0040] The main function of the antireflection coating 130 is to reduce external reflectivity. Without the antireflection coating 130, the external reflectivity is the same as that of the ink layer 120. With the antireflection coating 130, the external reflectivity is the equivalent reflectivity of the ink layer 120 and the antireflection coating 130, which further reduces the reflectivity and helps improve the transmittance of the prism 111.

[0041] The principle behind reducing reflectivity by coating the ink layer 120 with an antireflective film 130: The ink has an absorption rate close to 100%, and the ink itself has a reflectivity of about 2%. This reflectivity is caused by the difference in refractive indices between the ink and air, resulting in light interference. Coating the ink layer 120 with an antireflective film 130 brings the refractive indices of air and the antireflective film 130 closer together, reducing the interference effect and thus lowering the surface reflectivity of the ink layer 120. With reduced reflectivity, the generated light is absorbed by the ink.

[0042] Thin-film interference principle: When light propagates in a radiating medium, as it enters another medium, some light is reflected and some is refracted. Both reflected and refracted light are formed by the superposition of coherent light waves. When these two parts meet again at the interface, they interfere according to the principle of coherence. Figure 8 In the diagram, W3 represents the incident light, W1 represents the reflected light, W2 represents the light reflected from interface 1 at interface 2, n0 represents the refractive index of air, n1 represents the refractive index of interface 1, and n2 represents the refractive index of interface 2. For example... Figure 9 As shown, if the amplitudes of the two reflected beams are equal, then the interference is destructive, and λ is used to represent the wavelength.

[0043] Combination Figure 1 and Figure 2 As shown, in some embodiments, the light-transmitting substrate 110 optionally includes a prism 111 and / or a lens 112.

[0044] The light-transmitting substrate 110 can be a prism 111. A prism 111 is a transparent object formed by two planes that intersect but are not parallel to each other. It is used to split light or cause light beams to disperse. It is a polyhedron made of transparent material. In a periscope camera module, the prism 111 reflects light to the lens 112.

[0045] By sequentially stacking an ink layer 120 and an antireflection film 130 on the prism 111, the internal reflectivity of the prism 111 can be reduced, thereby reducing the risk of stray light.

[0046] Following the relevant technical method of coating first and then ink coating, the internal reflectivity of prism 111 is approximately 3.5%, which can be used as a reference. Figure 4 The reflectivity curve. After improving to a scheme of first applying ink and then coating, the internal reflectivity of prism 111 is approximately 0.7%, as referenced. Figure 6 As shown, the internal reflectivity is significantly reduced. After changing the coating and ink stacking scheme, the difference in external ink reflectivity is small. (See reference...) Figure 5 The external reflectance of the ink before improvement was approximately 0.4%. Figure 7 The improved external reflectivity of the ink is approximately 0.6%. The illustration above in this embodiment shows the reflectivity of one ink specification. If an ink with a lower reflectivity is available, the internal reflectivity can be reduced even further. The main components of the ink are special polymer resin series inks, including epoxy resin, organic solvents, colorants, defoamers, etc. The ink is an insulator. The resin is acrylic resin, the colorant is inorganic pigment, and the additive is organosilicon; this is one type of ink material.

[0047] The application of this embodiment is not limited to this prism 111 structure; it is applicable to other periscope prism 111 structures as well. In this embodiment, the method for reducing internal reflectivity can be used on the lenses of the lens 112. Applying ink to the edge of any lens element of the lens 112 followed by a coating treatment can improve the stray light effect inside the lens 112. This is not limited to specific requirements; the above is merely an exemplary embodiment of this invention.

[0048] In some embodiments, optionally, when the light-transmitting substrate 110 includes a prism 111, the prism 111 includes a glass prism or a plastic prism.

[0049] Prism 111 can be made of glass, plastic, or other materials. The glass substrate is not limited, and the refractive index is not limited. It can be lanthanide optical glass, heavy flint optical glass, low softening point optical glass, etc.

[0050] The processing technology for prism 111 can be cold working, grinding and polishing, or molding.

[0051] like Figure 3 As shown, in some embodiments, the prism 111 may optionally have a reflective surface 123, through which light incident into the light-transmitting substrate 110 is reflected to the exiting surface 122; the reflective surface 123 includes a total reflection surface; or the reflective surface 123 includes a non-total reflection surface, on which a reflective medium film and / or a reflective metal film are provided.

[0052] The reflecting surface 123 in prism 111 is an inclined surface. The inclined surface can be a total reflection surface or a non-total reflection surface. The non-total reflection surface needs to be coated with a dielectric film or a dielectric film plus a metal film. The metal film can be a silver or aluminum thin film, thereby increasing the reflectivity.

[0053] In some embodiments, optionally, when the light-transmitting substrate 110 includes a prism 111, the prism 111 includes a right-angle prism or a glued prism.

[0054] This embodiment Figure 3 Prism 111 in the diagram is a right-angle prism, and the design of prism 111 is not limited to... Figure 3 As shown, the above-mentioned scheme for reducing internal reflectivity can also be applied to cemented prisms, focal prisms 111, etc.

[0055] like Figure 1 As shown, in some embodiments, optionally, the first side of the ink layer 120 faces the light-transmitting substrate 110, the second side of the ink layer 120 faces the antireflective film 130, and the coefficient of friction of the first side of the ink layer 120 is less than the coefficient of friction of the second side of the ink layer 120.

[0056] The surface of the ink layer 120 can be roughened to make the surface of the ink layer 120 facing the antireflection film 130 rougher. This helps to improve the adhesion of the antireflection film 130 to the surface of the ink layer 120 and improve the adhesion effect of the antireflection film 130. Moreover, by making the surface of the ink layer 120 rougher, the internal reflectivity of the light-transmitting component 100 can be further reduced, thereby changing the stray light effect.

[0057] In one possible application, if a lower internal reflectivity is required, low-energy ion bombardment can be performed after the ink layer 120 is stacked on the prism 111. After the surface of the ink layer 120 is roughened, the coating adhesion can be increased, while the reflectivity is reduced, the stray light effect is improved, and a darker visual effect is achieved.

[0058] like Figure 1 As shown, in some embodiments, optionally, the thickness W of the ink layer 120 satisfies 5um ≤ W ≤ 8um.

[0059] When the thickness of the ink layer 120 is small, its thinness reduces its light-shielding effect. Conversely, when the thickness of the ink layer 120 is large, it occupies a significant amount of space in the thickness direction. In this embodiment, the thickness of the ink layer 120 is limited to between 5µm and 8µm. This ensures the light-shielding effect of the ink layer 120, prevents stray light, and reduces the space occupied by the ink layer 120 in the thickness direction, thereby improving the space utilization rate within the camera module.

[0060] For example, the thickness W of the ink layer can be 5um, 6um or 8um.

[0061] In one possible application, the dimensional error of the ink layer 120 is generally around ±30µm.

[0062] In some embodiments, the components of the antireflective membrane 130 may optionally include at least one of the following:

[0063] Titanium pentoxide, tantalum pentoxide, a mixture of lanthanum oxide and titanium dioxide, silicon dioxide and magnesium difluoride.

[0064] In this embodiment, the coating material of the antireflection film 130 contains high refractive index materials such as titanium pentoxide, tantalum pentoxide, lanthanum oxide and titanium dioxide, and refractive index materials such as silicon dioxide and magnesium difluoride.

[0065] In the embodiments of this application, a camera module is proposed, including the light-transmitting component in any of the above embodiments. The camera module in this embodiment can achieve the technical effects of the light-transmitting component in any of the above embodiments, which will not be described again here.

[0066] The camera module also includes a housing 300 and a photosensitive chip 200. The prism 111, lens 112 and photosensitive chip 200 are located inside the housing 300. External light shines on the photosensitive chip 200 after passing through the prism 111 and lens 112.

[0067] In the embodiments of this application, an electronic device is proposed, including the camera module in the above embodiments. The electronic device in this embodiment can achieve the technical effects of the camera module in any of the above embodiments, which will not be repeated here.

[0068] Electronic devices can include mobile phones, tablets, laptops, e-readers, smart wearable devices, etc.

[0069] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0070] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A light-transmitting component, characterized in that, include: A light-transmitting substrate having an incident surface and an exit surface; An ink layer is disposed on the circumferential edge of the incident surface and / or the circumferential edge of the exit surface; An antireflective film is disposed on the ink layer, wherein the ink layer is located between the light-transmitting substrate and the antireflective film; The first side of the ink layer faces the light-transmitting substrate, the second side of the ink layer faces the antireflective film, the coefficient of friction of the first side of the ink layer is less than the coefficient of friction of the second side of the ink layer, and the surface of the side of the ink layer facing the antireflective film is rough.

2. The light-transmitting component according to claim 1, characterized in that, The light-transmitting substrate includes: Prisms and / or lenses.

3. The light-transmitting component according to claim 1, characterized in that, When the light-transmitting substrate includes a prism, the prism includes: Glass prism or plastic prism.

4. The light-transmitting component according to claim 3, characterized in that, The prism also has a reflective surface, and light incident into the light-transmitting substrate is reflected by the reflective surface to the exiting surface. The reflecting surface includes a total reflection surface; or The reflective surface includes a non-total reflective surface, on which a reflective medium film and / or a reflective metal film are provided.

5. The light-transmitting component according to any one of claims 1 to 4, characterized in that, When the light-transmitting substrate includes a prism, the prism includes a right-angle prism or a cemented prism.

6. The light-transmitting component according to any one of claims 1 to 4, characterized in that, The thickness W of the ink layer satisfies 5um≤W≤8um.

7. The light-transmitting component according to any one of claims 1 to 4, characterized in that, The antireflective membrane comprises at least one of the following components: Titanium pentoxide, tantalum pentoxide, a mixture of lanthanum oxide and titanium dioxide, silicon dioxide and magnesium difluoride.

8. A camera module, characterized in that, include: The light-transmitting component as described in any one of claims 1 to 7.

9. An electronic device, characterized in that, include: The camera module as described in claim 8.

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