Camera module and terminal equipment

Abstract

The utility model discloses a camera module and terminal equipment, and belongs to the technical field of camera devices. The camera module comprises a prism assembly, an image sensor and at least one lens assembly, the prism assembly comprises a prism body, a first film layer and a second film layer, the prism body is provided with a light-in surface and a light-out surface, the first film layer is located on the light-in surface and connected with the light-in surface, and the second film layer is located on the light-out surface and connected with the light-out surface. One of the first film layer and the second film layer is an infrared absorption film, the other one is an antireflection film, the image sensor is opposite to the light emitting surface, and the lens assembly is located on the light incident side of the prism assembly, or the lens assembly is located between the light emitting surface and the image sensor. The infrared absorption film is arranged on the light incident surface or the light emergent surface of the prism body, so that the function of filtering infrared light by the camera module is realized, an independent element, namely an optical filter, is prevented from being arranged in the camera module, the assembly process of the camera module is simplified, and the assembly efficiency of the camera module is improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of camera devices, and particularly relates to a camera module and a terminal device. BACKGROUND

[0002] With the increasing requirements of users on various functions of electronic products, the use time of the camera module of the electronic product is gradually increased. During the working process of the camera module, the infrared light in the environment will enter the camera module. On the one hand, the infrared light is easy to affect the color balance, resulting in image distortion, reducing the imaging quality and definition of the image sensor. On the other hand, the infrared light may generate heat at the image sensor, thereby reducing the service life of the camera module.

[0003] In the related art, an infrared filter (IR filter) is arranged between the lens assembly and the image sensor of the camera module, for filtering the infrared light in the light radiated to the image sensor.

[0004] The scheme of adding the infrared filter increases the assembly process of the camera module, and reduces the assembly efficiency of the camera module. INVENTION CONTENTS

[0005] The present disclosure provides a camera module and a terminal device, which can solve the above technical problems existing in the related art. The technical solution is as follows:

[0006] In a first aspect, a camera module is provided, the camera module comprising a prism assembly, an image sensor, and at least one lens assembly;

[0007] The prism assembly comprises a prism body, a first film layer, and a second film layer. The prism body has an incident light surface and an emergent light surface. The first film layer is located on the incident light surface and connected with the incident light surface. The second film layer is located on the emergent light surface and connected with the emergent light surface. One of the first film layer and the second film layer is an infrared absorption film, and the other is an anti-reflection film.

[0008] The image sensor is opposite to the emergent light surface.

[0009] The lens assembly is located on the incident light side of the prism assembly, or the lens assembly is located between the emergent light surface and the image sensor.

[0010] In some possible implementation manners, the passband wavelength range of the infrared absorption film is 400nm-700nm.

[0011] In some possible implementation manners, the infrared absorption film has a multi-layer structure.

[0012] In some possible implementation manners, the anti-reflection film has a multi-layer structure.

[0013] In some possible implementation manners, the refractive index of the anti-reflection film layer close to one side of the prism body is the same as the refractive index of the prism body, and the refractive index of each layer of the anti-reflection film gradually decreases from the side close to the prism body to the side away from the prism body.

[0014] In some possible implementation manners, the prism body has a reflecting surface, and the prism assembly further comprises a third film layer, which is located on the reflecting surface and connected with the reflecting surface, and is used to improve the reflectivity of the reflecting surface.

[0015] In some possible implementation manners, the third film layer is a metal film or a dielectric film.

[0016] In some possible implementation manners, the prism assembly further comprises a transition layer, which is located between the first film layer and the light-in surface, and / or is located between the second film layer and the light-out surface.

[0017] In some possible implementation manners, the number of the lens assemblies is multiple, and a part of the lens assemblies are located on the light-in side of the lens assemblies and opposite to the light-in surface, and the other part of the lens assemblies are located between the prism assembly and the image sensor and are opposite to the light-out surface and the image sensor respectively.

[0018] In a second aspect, a terminal device is provided, and the terminal device comprises the camera module according to any one of the first aspect.

[0019] The technical solutions provided by the present disclosure have at least the following beneficial effects:

[0020] In the present disclosure, the infrared absorption film is arranged on the light-in surface or the light-out surface of the prism body, so that the camera module has the filtering function for infrared light, and the separate element of the optical filter is avoided, thereby simplifying the assembly process of the camera module and improving the assembly efficiency of the camera module.

[0021] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor.

[0023] Figure 1is a structural schematic diagram of an infrared absorption film provided by an embodiment of the present disclosure.

[0024] Figure 2 is a transmittance schematic diagram of an infrared absorption film provided by an embodiment of the present disclosure.

[0025] Figure 3 is a structural schematic diagram of an infrared absorption film provided by an embodiment of the present disclosure.

[0026] Figure 4 is a structural schematic diagram of an antireflection film provided by an embodiment of the present disclosure.

[0027] Figure 5 is a structural schematic diagram of a prism assembly provided by an embodiment of the present disclosure.

[0028] Figure 6 is a structural schematic diagram of a camera module provided by an embodiment of the present disclosure.

[0029] Figure 7 is a structural schematic diagram of a camera module provided by an embodiment of the present disclosure.

[0030] Reference signs:

[0031] 1, prism assembly; 11, prism body; 11a, light entrance surface; 11b, light exit surface; 11c, reflecting surface; 12, first film layer; 13, second film layer; 14, third film layer; 15, transition layer;

[0032] 2, image sensor;

[0033] 3, lens assembly.

[0034] The above drawings have shown the explicit embodiments of the present disclosure, and the following will have more detailed descriptions. These drawings and textual descriptions are not intended to limit the scope of the concept of the present disclosure by any means, but to illustrate the concept of the present disclosure to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0035] In order to make the purposes, technical solutions and advantages of the present disclosure clearer, the following will make further detailed descriptions on the embodiments of the present disclosure in combination with the drawings.

[0036] Referring to Figure 1 Fig. 1, an embodiment of the present disclosure provides a camera module, which includes a prism assembly 1, an image sensor 2 and at least one lens assembly 3.

[0037] The prism assembly 1 comprises a prism body 11, a first film layer 12 and a second film layer 13, the prism body 11 has an incident light surface 11a and an emergent light surface 11b, the first film layer 12 is located on the incident light surface 11a and connected with the incident light surface 11a, the second film layer 13 is located on the emergent light surface 11b and connected with the emergent light surface 11b, one of the first film layer 12 and the second film layer 13 is an infrared absorption film, and the other is an anti-reflection film.

[0038] The prism body 11 can change the propagation path of light, thereby realizing the target that the camera module is used as a periscope lens module.

[0039] The infrared absorption film, also known as an IR (Infrared Filter) film, mainly functions to cut off infrared light while allowing visible light to pass through. Infrared light is a kind of electromagnetic wave. When infrared light interacts with the substance on the infrared absorption film, it will cause the vibration, rotation and electron transition of molecules and atoms in the substance, which will change the properties and structure of the substance, thereby realizing the absorption of infrared light.

[0040] The anti-reflection film, also known as a reflection-reducing film, an AR (Anti Reflection) film, an AR sheet, and a reflection-reducing filter, can increase the transmittance of the prism body 11 to light, so that more light can pass through the prism body 11, and can also reduce the reflected light and stray light in the propagation path of the light, thereby improving the imaging quality or display effect of the image sensor 2.

[0041] The image sensor 2 is opposite to the emergent light surface 11b. The image sensor 2 can convert the received light signal into an electrical signal, and then the electrical signal is processed and analyzed by an image processing chip to finally generate a digital image signal, which is processed, displayed or stored by a digital device.

[0042] The kind of the image sensor 2 is not specifically limited in the disclosure, and can be matched and set according to the use scene, resolution requirement, manufacturing cost and other parameters. For example, the image sensor 2 can be a CCD (Charge Coupled Device) sensor, and the image sensor 2 can also be a CMOS (Complementary Metal Oxide Semiconductor) sensor.

[0043] The lens assembly 3 is located on the light entrance side of the prism assembly 1, or the lens assembly 3 is located between the light exit surface 11b and the image sensor 2. On the one hand, the lens assembly 3 is used to converge light rays, and the lens assembly 3 can effectively collect and focus light rays from an object through its special shape and optical performance, so that the light rays can be accurately projected onto the light-sensitive surface of the image sensor 2. On the other hand, the lens assembly 3 also has the function of adjusting the focal length in the camera module. By adjusting the position or shape of the internal elements of the lens assembly 3, the focal length of the camera module can be changed, thereby realizing clear imaging of objects at different distances.

[0044] The number of lens assemblies 3 is not specifically limited in the present disclosure, and can be matched and set according to parameters such as the size design, optical performance requirements, etc. of the camera module. The internal structure of the lens assembly 3 is also not specifically limited in the present disclosure, and different lens assemblies 3 can have different numbers and shapes of lenses.

[0045] In the embodiments of the present disclosure, an infrared absorption film is arranged on the light entrance surface 11a or the light exit surface 11b of the prism body 11, thereby realizing the filtering function of the camera module to infrared light, avoiding the arrangement of a separate filter element in the camera module, simplifying the camera module assembly process, and improving the camera module assembly efficiency.

[0046] At the same time, since the filter itself and the installation both require a certain space, the infrared absorption film is used to replace the filter in the embodiments of the present disclosure, which can also compress the overall size of the camera module. This is conducive to the design pursuit of miniaturization and portability of terminal equipment. The cancellation of the filter element can also reduce the light loss caused by the filter and the stray light ghost image caused by the reflection of the filter.

[0047] In some embodiments, the passband wavelength range of the infrared absorption film is 400nm-700nm. Figure 2 is a transmittance diagram of an infrared absorption film provided by the embodiments of the present disclosure, which shows that Figure 2 It can be seen that the infrared absorption film has the characteristics shown in Table 1: the transmittance of the infrared absorption film to light with a wavelength greater than 710nm and less than 390nm is <1%, and the transmittance of the infrared absorption film to light with a wavelength greater than 700nm and less than 400nm is <5%. Therefore, it can be considered that the infrared absorption film absorbs light with a wavelength greater than 700nm and less than 400nm, and allows light with a wavelength of 400nm-700nm to pass through, i.e., allows visible light to pass through.

[0048] Table 1

[0049] Wavelength (nm) <390 nm <400 nm 450nm-650nm >700nm >710nm Transmittance <1％ <5％ >90％ <5％ <1％

[0050] Referring to Figure 3 In some embodiments, the infrared absorption film has a multi-layer structure, i.e. Figure 3The multilayer structure of the infrared absorption film can have different thickness and refractive index parameters on one hand, thereby accurately setting the specific range of the passband wavelength and realizing strong absorption of specific infrared wavelength bands; on the other hand, different material layers in the multilayer structure can complement each other, improving the stability and durability of the overall structure. For example, some oxide materials have the characteristics of high temperature resistance, thermal shock resistance, high mechanical strength, hardness, and are very suitable for use as protective layers or reinforcing layers of the infrared absorption film. The addition of these materials can effectively prevent film layer peeling, aging and other problems, and prolong the service life of the infrared absorption film.

[0051] With reference to Figure 4 In some embodiments, the antireflection film has a multilayer structure, i.e. Figure 4 b1 to bn layers in the infrared absorption film. On one hand, the multilayer structure of the antireflection film can continuously reduce reflected light, reducing reflection to less than 0.1% of incident light, thereby significantly improving the transmittance of the optical device and reducing optical loss. On the other hand, a single layer of antireflection film usually only has complete antireflection effect on monochromatic light of a certain wavelength, while the multilayer structure can improve the antireflection effect and increase the line width, i.e. the frequency width, of the transmitted light, so that the multilayer antireflection film has better application performance in a wide spectral range.

[0052] At the same time, the multilayer structure can also increase the wear resistance and scratch resistance of the antireflection film, which ensures the long-term stability of the prism assembly 1 during use and prolongs the service life of the prism assembly 1.

[0053] In some embodiments, the refractive index of the film layer near the prism body 11 side of the antireflection film is the same as that of the prism body 11, and the refractive index of each layer of the antireflection film gradually decreases from the side near the prism body 11 to the side away from the prism body 11.

[0054] When light enters from one medium to another medium, the propagation direction of the light will change, i.e. refraction, due to the difference in refractive index of the two media. If the refractive index of the medium changes rapidly, the light will frequently change direction during propagation, which will increase the scattering and absorption of the light, thereby increasing the loss of the light. In the related art, the light directly enters the air from the light exit surface 11b of the prism body 11, and the refractive index difference between the prism body 11 and the air is large. In turn, the light has a large loss.

[0055] In the embodiments of the present disclosure, the refractive index of the film layer near the prism body 11 side of the antireflection film is the same as that of the prism body 11, and the refractive index of each layer of the antireflection film gradually decreases from the side near the prism body 11 to the side away from the prism body 11, and in turn the refractive index of the film layer away from the prism body 11 side of the antireflection film is close to that of the air. In this way, the refractive index of the medium on the light propagation path changes at a smaller rate, thereby reducing the loss of the light and improving the propagation efficiency of the light.

[0056] Referring to Figure 5 As shown in the drawings, in some embodiments, the prism body 11 has a reflective surface 11c, and the prism assembly 1 further comprises a third film layer 14 located on and connected with the reflective surface 11c, and the third film layer 14 is used to improve the reflectivity of the reflective surface 11c.

[0057] In this way, the third film layer 14 can effectively improve the reflection of the light entering the prism body 11 at the reflective surface 11c, avoid the light entering the prism body 11 from being refracted at the reflective surface 11c and failing to be transmitted to the light exit surface 11b, and further affect the imaging quality or display effect of the image sensor 2.

[0058] In some embodiments, the third film layer 14 is a metal film or a dielectric film. The metal film can be an aluminum film, which has good adhesion to the glass substrate, and a dense layer of aluminum oxide (Al2O3) can be formed on the surface of the aluminum film in the atmosphere, which serves as a protective film. The metal film can also be a silver film, which has the highest reflectivity in the visible and infrared wavebands, but has poor mechanical strength and chemical stability and is prone to oxidation or sulfuration, so a suitable protective layer is needed to improve its stability.

[0059] The dielectric film can be a full-dielectric multilayer reflective film, which is a multilayer structure film formed by alternately evaporating dielectric materials with different refractive indices. The full-dielectric multilayer reflective film has high reflectivity and low absorption. The dielectric film can be a metal-dielectric reflective film, which is a composite film combining a metal film and a dielectric film. By coating several layers of dielectric layers with a certain thickness on the outside of the metal film, the reflectivity can be further improved.

[0060] The type of the third film layer 14 can be matched and selected according to the use scenario of the prism assembly 1, the reflectivity requirement of the reflective surface 11c, the manufacturing cost, and other parameters.

[0061] Referring to Figure 5 As shown in the drawings, in some embodiments, the prism assembly 1 further comprises a transition layer 15 located between the first film layer 12 and the light entrance surface 11a, and / or between the second film layer 13 and the light exit surface 11b.

[0062] The transition layer 15 can improve the overall stability of the first film layer 12 and the second film layer 13, which helps to prevent the first film layer 12 and the second film layer 13 from falling off or delaminating during use, thereby prolonging the service life of the film layers.

[0063] For example, the transition layer 15 can be a silicon oxide (SiO2) transition layer, which has good insulation, chemical stability, and specific optical and electrical properties.

[0064] Referring toFigure 6 As shown in some embodiments, one or more lens assemblies 3 are located on the light-in side of the prism assembly 1, so that the lens assemblies 3 with larger sizes can occupy the thickness direction of the terminal device. The terminal device is set to have a size of the entire camera module in the thickness direction of the terminal device due to other cameras (for example, a main camera, an ultra-wide-angle camera), and therefore, the camera module in the embodiments of the present disclosure can occupy the space in the thickness direction, without occupying too much space in the length or width direction of the terminal device.

[0065] Referring to Figure 1 As shown in some embodiments, one or more lens assemblies 3 are located on the light-in side of the prism assembly 1, so that the lens assemblies 3 with larger sizes can occupy the thickness direction of the terminal device. The terminal device is set to have a size of the entire camera module in the thickness direction of the terminal device due to other cameras (for example, a main camera, an ultra-wide-angle camera), and therefore, the camera module in the embodiments of the present disclosure can occupy the space in the thickness direction, without occupying too much space in the length or width direction of the terminal device.

[0066] Referring to Figure 7 As shown in some embodiments, the number of lens assemblies 3 is multiple, wherein a part of the lens assemblies 3 are located on the light-in side of the lens assemblies 3 and opposite to the light-in surface 11a, and another part of the lens assemblies 3 are located between the prism assembly 1 and the image sensor 2 and opposite to the light-out surface 11b and the image sensor 2, respectively.

[0067] In this way, the lens assemblies 3 with larger sizes in the camera module are dispersed to occupy the space in the length or width direction of the terminal device and the space in the thickness direction of the terminal device, so that the space demand of the camera module in a certain direction can be avoided.

[0068] Based on the same concept, the embodiments of the present disclosure also provide a terminal device, which can include the camera module in any one of the above embodiments.

[0069] The terminal device involved in the present disclosure can also be referred to as a terminal, a mobile terminal, an electronic device, a user equipment (UE), etc. Exemplarily, the terminal device can be a smart phone, a tablet computer, a notebook computer, a wearable device (for example, a smart watch), etc., or can also be a digital camera, a single-lens reflex camera / micro-single camera, a gimbal camera, a sports video camera, a professional shooting device such as a drone, etc. It should be understood that the present disclosure does not specifically limit the specific technology and specific device form of the terminal device. In the description of the above embodiments, a mobile phone is taken as an example for description, but the present disclosure is not limited thereto.

[0070] In the description of the specification, the description of the terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0071] It can be understood that "multiple" in the present disclosure means two or more, and other quantifiers are similar. The association relationship of the associated objects described by "and / or" means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. The character " / " generally represents that the associated objects before and after are in an "or" relationship. The singular form of "a", "said" and "the" is also intended to include the plural form, unless the context clearly indicates otherwise.

[0072] It can be further understood that the terms "first", "second", etc. are used to describe various information, but these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other, and do not represent a specific order or importance. In fact, the expressions of "first", "second", etc. can be used interchangeably. For example, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information without departing from the scope of the present disclosure.

[0073] It can be further understood that the terms "center", "longitudinal", "transverse", "front", "back", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation.

[0074] It will be further understood that terms, such as "mounting", "connecting", "connecting", "fixing", etc., are to be interpreted broadly in accordance with their usage in the relevant art, and may, for example, include fixed connections, detachable connections, or integral connections; may be either mechanical or electrical connections or may be communication between two elements; may be direct connections between two elements, or indirect connections through one or more intermediate elements; may be connections between internal components of two elements, or interactions between two elements. The specific meaning of these terms in the context of the present disclosure will be apparent to those skilled in the art in view of the teachings provided herein.

[0075] It will be further understood that, unless otherwise specified, the terms "mounting", "connecting", "connecting", "fixing", etc., are to be interpreted broadly in accordance with their usage in the relevant art, and may, for example, include fixed connections, detachable connections, or integral connections; may be either mechanical or electrical connections or may be communication between two elements; may be direct connections between two elements, or indirect connections through one or more intermediate elements; may be connections between internal components of two elements, or interactions between two elements. The specific meaning of these terms in the context of the present disclosure will be apparent to those skilled in the art in view of the teachings provided herein.

[0076] Other embodiments of the present disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the aspects disclosed herein. It is intended that the present disclosure cover any and all variations of the present disclosure including those variations that are now known or become known in the future, which follow, in general, the principles of the present disclosure, and include any available prior art. The specification and examples are to be construed as merely illustrative of the present disclosure and not limitative of the true scope and spirit of the present disclosure.

[0077] It should be understood that the present disclosure is not limited to the precise structures herein described and illustrated in the drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the claims appended hereto.

Claims

1. An image capturing module, comprising: The camera module comprises a prism assembly (1), an image sensor (2) and at least one lens assembly (3); The prism assembly (1) comprises a prism body (11), a first film layer (12) and a second film layer (13), the prism body (11) has an entrance surface (11a) and an exit surface (11b), the first film layer (12) is located on the entrance surface (11a) and connected with the entrance surface (11a), the second film layer (13) is located on the exit surface (11b) and connected with the exit surface (11b), one of the first film layer (12) and the second film layer (13) is an infrared absorption film, and the other is an anti-reflection film; The image sensor (2) is opposite to the exit surface (11b); The lens assembly (3) is located on the entrance side of the prism assembly (1), or the lens assembly (3) is located between the exit surface (11b) and the image sensor (2).

2. The camera module according to claim 1, wherein the passband of the infrared absorption film is 400-700 nm.

3. The camera module according to claim 1, wherein the infrared absorption film has a multi-layer structure.

4. The camera module according to claim 1, wherein the anti-reflection film has a multi-layer structure.

5. The camera module according to claim 4, wherein the refractive index of the film layer close to one side of the prism body (11) of the anti-reflection film is the same as the refractive index of the prism body (11), and the refractive index of each layer of the anti-reflection film gradually decreases from the side close to the prism body (11) to the side away from the prism body (11).

6. The camera module according to claim 1, wherein the prism body (11) has a reflecting surface (11c), and the prism assembly (1) further comprises a third film layer (14), the third film layer (14) is located on the reflecting surface (11c) and connected with the reflecting surface (11c), and the third film layer (14) is used to improve the reflectivity of the reflecting surface (11c).

7. The camera module according to claim 6, wherein the third film layer (14) is a metal film or a dielectric film.

8. The camera module according to claim 1, wherein the prism assembly (1) further comprises a transition layer (15), the transition layer (15) is located between the first film layer (12) and the entrance surface (11a), and / or between the second film layer (13) and the exit surface (11b).

9. The camera module according to any one of claims 1-8, wherein the number of the lens assemblies (3) is multiple, wherein a part of the lens assemblies (3) are located on the entrance side of the lens assemblies (3) and opposite to the entrance surface (11a), and another part of the lens assemblies (3) are located between the prism assembly (1) and the image sensor (2) and opposite to the exit surface (11b) and the image sensor (2) respectively. ​ ​ ​ ​ ​ ​ ​ ​ 10. A terminal device, comprising: The terminal device comprises the camera module as claimed in any one of claims 1-9.

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