CN113079304A - Camera module and electronic equipment - Google Patents
Camera module and electronic equipment Download PDFInfo
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- CN113079304A CN113079304A CN202110448699.8A CN202110448699A CN113079304A CN 113079304 A CN113079304 A CN 113079304A CN 202110448699 A CN202110448699 A CN 202110448699A CN 113079304 A CN113079304 A CN 113079304A
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- camera module
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- bearing
- refractive index
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
- H04M1/026—Details of the structure or mounting of specific components
- H04M1/0264—Details of the structure or mounting of specific components for a camera module assembly
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/57—Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices
Abstract
The application discloses module and electronic equipment make a video recording, the module of making a video recording includes sensitization piece, camera lens subassembly and holds carrier, the camera lens subassembly sets up in the top of sensitization piece, holds carrier and sets up between camera lens subassembly and sensitization piece, the refracting index that holds carrier gradually changes, the propagation path of the light that penetrates in holding carrier from the camera lens subassembly is the curve, and light passes and holds carrier back directive sensitization piece. The refractive index gradual change that this application embodiment designed and bore thing for hold thing at its last lens in replacing original lens subassembly in the function, make original lens subassembly can reduce at least a slice lens, reduce the height of the module of making a video recording, be favorable to realizing the frivolous design of electronic equipment such as cell-phone.
Description
Technical Field
The application relates to the technical field of electronic equipment, in particular to a camera module and electronic equipment.
Background
At present, the performance requirements of the camera module in various aspects (such as high pixel, high resolution and large aperture) are higher and higher for users. Therefore, the number of lenses in the lens assembly is increasing, which directly leads to the height of the camera module being also increasing, so that the thickness of the electronic device such as a mobile phone and the like which should have the camera module is increasing, even the projection of the camera module becomes a normal state, which is not in accordance with the requirement of thinning the mobile phone.
In addition, infrared light in the ambient light interferes with the sensitization of the photosensitive member. Therefore, in the related art, a bearing member is disposed between the lens assembly and the photosensitive member, and a filter member and an anti-reflection member are disposed on the bearing member. However, the bearing member only plays a role in bearing the light filtering member and the anti-reflection member, and does not help to reduce the height of the camera module.
Disclosure of Invention
The application aims at providing a camera module and electronic equipment, and the technical problem that the size of the camera module is high in the related art is at least solved.
In order to solve the technical problem, the present application is implemented as follows:
in a first aspect, an embodiment of the present application provides a camera module, which includes a photosensitive part, a lens assembly, and a bearing part, wherein the lens assembly is disposed on a top of the photosensitive part, the bearing part is disposed between the lens assembly and the photosensitive part, a refractive index of the bearing part changes gradually, a propagation path of light emitted from the lens assembly in the bearing part is a curve, and the light passes through the bearing part and then emits to the photosensitive part.
In a second aspect, an embodiment of the present application provides an electronic device, including: the camera module of the above embodiment.
In an embodiment of the application, the refractive index of the carrier is graded. That is, when light penetrated inside the carrier through the lens subassembly, the propagation path of light in carrying the carrier was the curve, makes like this and carries the carrier and also has certain aggregation effect to light for carry the carrier and on the basis of originally bearing optical filter and anti-reflection piece, possessed the effect of lens, make and carry the carrier and cooperate the use jointly with the lens subassembly, realized the effect of assembling to light. Like this, can reduce the inside lens quantity of camera lens subassembly, reduce the height of camera lens subassembly self, and then reduce the height of whole module of making a video recording, realized the miniaturized design of the module of making a video recording. Moreover, when the camera module is applied to electronic equipment such as a mobile phone, the light and thin design of the electronic equipment such as the mobile phone can be realized.
Therefore, the camera module that this application embodiment provided optimizes the optical property who holds carrier, make the refracting index that holds carrier gradually change, make hold carrier to possess the function of lens, make hold carrier and lens component in lens constitute new real camera lens, make hold carrier in function its last lens of replacing original lens component, make original lens component can reduce at least a piece of lens, thereby when satisfying imaging performance, reduce camera module's height, realize the frivolous design of electronic equipment such as cell-phone.
Additional aspects and advantages of the present 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 the present application.
Drawings
The above and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic view of a camera module according to one embodiment of the present application;
fig. 2 is a schematic diagram of a light path of light rays passing through a bearing member in the camera module shown in fig. 1;
FIG. 3 is a schematic illustration of the principle of refraction;
FIG. 4 is a schematic view of a carrier with a gradually changing refractive index in the camera module shown in FIG. 1;
FIG. 5 is a schematic view of a graded index of refraction of a carrier in a camera module according to an embodiment of the present application;
FIG. 6 is a schematic view illustrating a gradient refractive index of a carrier in a camera module according to yet another embodiment of the present application;
FIG. 7 is a schematic view illustrating a gradient refractive index of a carrier in a camera module according to yet another embodiment of the present application;
fig. 8 is a schematic view of a camera module according to yet another embodiment of the present application.
Reference numerals in fig. 1 to 8:
102 a light sensitive member, 104 a lens assembly, 1042 a lens, 106 a bearing member, 108 a light filtering member, 110 an anti-reflection member, 112 a glass cover plate, 114 a shell, 116 a first magnetic member, 118 a second magnetic member.
Detailed Description
Reference will now be made in detail to the embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description and claims of this application, the term "plurality" means two or more unless otherwise specified. Further, "and/or" in the specification and claims means at least one of the connected objects.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be taken as limiting the present application.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The following describes an image pickup module and an electronic apparatus according to an embodiment of the present application with reference to fig. 1 to 8. Wherein, in fig. 1, 5, 6, and 8, a broken line L indicates an optical axis of the photosensitive member 102; in fig. 1, 2 and 8, the density of vertical bars in the carrier 106 represents the refractive index magnitude, and a higher density of vertical bars represents a higher refractive index there; in fig. 4, 5, 6 and 7, the gray scale indicates the magnitude of the refractive index, and the deeper the gray scale indicates the greater the refractive index at that position.
As shown in fig. 1 and 2, an embodiment of the present application provides a camera module, which includes a photosensitive member 102, a lens assembly 104, and a bearing member 106. The lens assembly 104 is disposed above the photosensitive member 102, and the bearing 106 is disposed between the lens assembly 104 and the photosensitive member 102, and can be used for bearing related components (a bearing filter 108 and an anti-reflection member 110) in the camera module. During use of the imaging device, external light passes through the lens assembly 104 and the bearing member 106 in sequence, and is finally emitted into the photosensitive member 102.
In particular, as shown in fig. 4, the refractive index of the carrier 106 is graded. That is, when light enters the inside of the bearing 106 through the lens assembly 104, the propagation path of the light in the bearing 106 is a curve, so that the bearing 106 also has a certain focusing effect on the light, and the bearing 106 has the function of the lens 1042 on the basis of originally bearing the filter 108 and the anti-reflection element 110, so that the bearing 106 and the lens assembly 104 are used together to realize the focusing effect on the light. Therefore, the number of the lenses 1042 in the lens assembly 104 can be reduced, the height of the lens assembly 104 is reduced, the height of the whole camera module is reduced, and the miniaturization design of the camera module is realized. Moreover, when the camera module is applied to electronic equipment such as a mobile phone, the light and thin design of the electronic equipment such as the mobile phone can be realized.
Therefore, the camera module provided in this embodiment of the present application optimizes the optical property of the carrier 106, so that the refractive index of the carrier 106 changes gradually, so that the carrier 106 has the function of the lens 1042, so that the carrier 106 and the lens 1042 in the lens assembly 104 form a new real lens, so that the carrier 106 replaces the last lens in the original lens assembly in terms of function, so that the original lens assembly can reduce at least one lens, thereby satisfying the imaging performance, reducing the height of the camera module, and realizing the light and thin design of electronic devices such as mobile phones.
It should be noted that, the gradual refractive index of the carrier 106 refers to: the refractive index of the supporting member 106 gradually increases or decreases rather than abruptly changing, so as to ensure that the propagation path of the light in the supporting member 106 is curved.
As a possible implementation, as shown in fig. 1 and 2, the bearing member 106 is a carrier sheet, and the optical axis L of the lens assembly 104 is perpendicular to the carrier sheet. This ensures that the supporting member 106 covers the photosensitive member 102, ensures that light rays emitted toward the photosensitive member 102 pass through the supporting member 106, and facilitates the preparation of the supporting member 106 having a gradually changing refractive index. Because the supporting member 106 is generally prepared separately, after the camera module is assembled, it is ensured that the optical axis L of the lens assembly 104 is perpendicular to the supporting sheet, that is, the relative position between the supporting member 106 and the photosensitive member 102 is ensured, so that the worker can control the gradual change of the refractive index when preparing the supporting member 106.
As a possible implementation manner, as shown in fig. 5, the refractive index of any position on the supporting member 106 in the extending direction of the optical axis L is negatively related to the distance from the position to the center of the supporting member 106, and it should be noted here that the center of the supporting member 106 in the extending direction of the optical axis L is 1/2 of the thickness of the supporting member 106, that is, the center of the supporting member 106 in the extending direction of the optical axis L is a plane, and the distance from the plane to the two sides of the supporting member 106 is equal, which can be understood by those skilled in the art. Further, the refractive index of any position on the carrier 106 in the extending direction of the optical axis L, negatively related to the distance from the position to the center of the carrier 106, refers to: the greater the distance of the location from the center of the carrier 106, the smaller the refractive index of the location.
Therefore, in this embodiment, when light is emitted from one side of the carrier 106 to the other side, it is ensured that the light passes through the graded-index carrier 106 inside the carrier 106, and further it is ensured that the light inside the carrier 106 is curved, that is, the graded-index carrier 106 is ensured to gather the light, so that the carrier 106 can serve as the lens 1042, and it is ensured that the carrier 106 and the plurality of lenses 1042 in the lens assembly 104 cooperate to function as a lens in the related art.
As a possible implementation, as shown in fig. 6, in a plane perpendicular to the optical axis L, the refractive index of any position on the supporting member 106 is negatively related to the distance from the position to the optical axis L. In this way, when different light rays are emitted from one side of the carrier 106 to the other side, the different light rays are absorbed into the portions of the carrier 106 with different refractive indexes, so that the different light rays have different refraction angles when being absorbed into the carrier 106, and are absorbed into the interior of the carrier 106 at different angles and spread along a curve in the carrier 106. In this way, the focusing effect of the graded-index carrier 106 on the light is ensured, so that the carrier 106 can serve as the lens 1042, and the carrier 106 and the plurality of lenses 1042 in the lens assembly 104 are ensured to cooperate to function as a lens in the related art.
It should be noted that, in a plane perpendicular to the optical axis L, the refractive index of any position on the supporting member 106, which is negatively related to the distance from the position to the optical axis L, refers to: the larger the distance from the optical axis L of a position on the bearing member 106, the larger the gradation ratio of the position.
As a possible implementation, as shown in fig. 5, the refractive index of the carrier 106 is graded in the extending direction of the optical axis L. That is, the refractive index of the carrier 106 is gradually varied along the extending direction of the optical axis L. Thus, the same light beam passes through the bearing 106 at a different refractive index than the bearing 106. Then, the propagation direction of the light beam is continuously changed inside the bearing component 106, so that the propagation path of the light beam on the bearing component 106 is ensured to be a curve, that is, the light beam is collected by the bearing component 106, so that the bearing component 106 can serve as the lens 1042, and the bearing component 106 and the plurality of lenses 1042 in the lens assembly 104 are ensured to be matched for use, and jointly play a role of a lens in the related art.
As a possible implementation manner, as shown in fig. 6, in a plane perpendicular to the optical axis L, the refractive index of the supporting member 106 is gradually changed toward the periphery with the optical axis L as the center. That is, the index of refraction of the carrier 106 is graded in the plane in which it lies. Therefore, for a plurality of light rays, the plurality of light rays are incident on the position of the supporting member 106 with different refractive indexes. Therefore, the refraction angles of different light rays generated when the light rays enter the bearing member 106 are different, and the propagation direction of the light rays obliquely absorbed into the bearing member 106 is ensured to be changed continuously, so that the propagation path of the different light rays in the bearing member 106 is ensured to be a curve, that is, the bearing member 106 is ensured to gather the light rays, so that the bearing member 106 can serve as the lens 1042, and the bearing member 106 and the plurality of lenses 1042 in the lens assembly 104 are ensured to be matched for use, thereby playing a role of the lens in the related art together.
As a possible embodiment, as shown in fig. 7, the refractive index of the supporting member 106 is gradually changed in the extending direction of the optical axis L, and the refractive index of the supporting member 106 is gradually changed toward the periphery with the optical axis L as the center in a plane perpendicular to the optical axis L. That is, for the same light, in the process of passing through the bearing member 106, the light passes through the position where the refractive index of the bearing member 106 is different, and the propagation direction of the light is continuously changed in the bearing member 106, so that the propagation path of the light in the bearing member 106 is a curve, that is, the light gathering effect of the bearing member 106 on the light is ensured. For different light beams, the light beams can be shot into the position of the bearing member 106 with different refractive indexes, the refraction angles of the different light beams generated when the light beams are shot into the bearing member 106 are different, and the continuous change of the propagation direction of the light beams shot into the bearing member 106 in an inclined manner is ensured, so that the propagation paths of the different light beams in the bearing member 106 are ensured to be curves, that is, the light gathering effect of the bearing member 106 on the light beams is ensured.
As one possible implementation, as shown in fig. 1, the lens assembly 104 includes a plurality of lenses 1042. The plurality of lenses 1042 are stacked and distributed on the top of the bearing member 106, and the plurality of lenses 1042 and the bearing member 106 are ensured to be matched for use, so as to serve as a lens assembly in the related art, ensure the convergence effect on light rays, and ensure the accurate focusing of the camera module.
In particular, as shown in fig. 1, the gradient of the refractive index of the carrier 106 is matched to the optical properties of the plurality of lenses 1042. That is, the graded index of the carrier 106 needs to be matched with the plurality of lenses 1042 of the lens assembly 104, and it can be realized that the graded index of the carrier 106 is functionally equivalent to the lens assembly in the related art by using the plurality of lenses 1042 of the lens assembly 104.
In addition, the present embodiment, due to the use of the graded index carrier 106, ensures that the carrier 106 can serve as the last lens 1042 in the lens assembly 104. That is, compared to the lens assembly adopted in the related art, the embodiment of the present application can reduce at least one lens 1042 of the lens assembly 104, thereby reducing the height of the lens assembly 104, so as to achieve a miniaturized design of the lens assembly 104 and the camera module.
As a possible implementation manner, as shown in fig. 1, the camera module further includes a light filtering component 108 and an anti-reflection component 110. Wherein the filter 108 is disposed on the carrier 106 and supported by the carrier 106; an anti-reflection member 110 is disposed on the side of the support member 106 facing the photosensitive member 102, on the top of the photosensitive member 102. The optical filter 108 is disposed on the supporting member 106 and can filter out infrared light in the ambient light, so as to eliminate interference of the infrared light to the photosensitive member 102. The anti-reflective element 110 reduces the reflection of visible light from the carrier 106 and the underlying air interface. Therefore, through the matching of the green light piece and the anti-reflection piece 110, the photographing and photographing effects of the photographing module can be further improved.
As a possible embodiment, as shown in fig. 8, the camera module further includes a glass cover plate 112. The glass cover plate 112 covers the top of the lens assembly 104 and can protect the lens assembly 104. In addition, the refractive index of the glass cover plate 112 changes gradually, when light enters the glass cover plate 112, the propagation path of the light in the glass cover plate 112 is a curve, so that the glass cover plate 112 also has a certain focusing effect on the light, and the glass cover plate 112 has the function of the lens 1042 on the basis of the related components originally including the lens assembly 104, so that the glass cover plate 112 and the lens assembly 104 are used together, and the focusing effect on the light is realized.
Therefore, the number of the lenses 1042 in the lens assembly 104 can be reduced, the height of the lens assembly 104 is reduced, the height of the whole camera module is reduced, and the miniaturization design of the camera module is realized. Therefore, when the camera module is applied to electronic equipment such as a mobile phone, the light and thin design of the electronic equipment such as the mobile phone can be realized.
In particular, based on the cooperative use of the graded-index carrier 106 and the graded-index glass cover plate 112, the number of the lenses 1042 in the lens assembly 104 can be reduced by at least two, the height of the lens assembly 104 itself can be further reduced, the height of the whole camera module can be further reduced, and the miniaturization design of the camera module can be further realized.
The embodiment of the application further provides an electronic device which comprises the camera module. Therefore, the camera module has all the advantages of the camera module, and the discussion is not repeated here.
Specifically, the electronic device may be a mobile phone, a tablet computer, or the like.
In the specific embodiment, the mobile phone is a popular consumer electronic device, and a life style of people is changed. The importance of the method also promotes the iteration speed of the product, and the performance requirements of all aspects are higher and higher (especially the photographing performance: high pixel, high resolution and large aperture). Therefore, the lens quantity of the lens assembly is more and more, the 7P lens is already produced in quantity, and the height of the camera module is also higher and higher, so that the thickness of the mobile phone is larger and larger, even the bulge of the camera module becomes a normal state, and the appearance and the use experience are seriously influenced. Therefore, the height of the camera module is reduced to be an urgent problem to be solved, the existing solutions such as telescopic type are not mature enough, the reliability is not guaranteed, and the consumer is difficult to accept the camera mode.
In the related art, in order to improve the photographing performance, the height of the conventional mobile phone camera module is higher and higher, the thickness of the whole mobile phone is seriously increased, the mobile phone camera module does not meet the requirement of lightness and thinness of the mobile phone, the appearance and the use experience are influenced, and the mobile phone is not placed flatly on a desktop if a convex camera is arranged. On the other hand, infrared light in ambient light also interferes with the sensitization of the sensitization piece, the incident angle of the infrared light on the aspheric lens is larger, and the existing infrared antireflection coating technology is directly coated on the surface of the aspheric lens and cannot achieve the required effect. Therefore, in the related art, a filter coated with an infrared cut-off film is specially added in the camera module to eliminate infrared light.
Therefore, the bearing part of the optical filter in the existing camera module does not play any role, but also can increase dispersion and enhance chromatic aberration, so that some parasitic light such as purple fringing is more serious. Therefore, under the requirement of seeking the limit of the space size of the camera module, the bearing part should be excavated to have greater value and function.
The embodiment of the application provides a camera module, as shown in fig. 1 and 2, the height of the camera module can be reduced, and the overall height of a mobile phone can be further reduced. In the embodiment of the present application, the lens assembly 104 and the bearing member 106 are combined, and the bearing member 106 with a special design has the function of the lens 1042, so as to form a new real lens with the original lens assembly 104. The carrier 106 functionally replaces the last lens of the original lens assembly 104, so that the number of the lenses 1042 in the original lens assembly 104 can be reduced, thereby satisfying the imaging performance, reducing the height of the camera module, and realizing the light and thin requirements of the mobile phone.
Specifically, as shown in fig. 1 and 2, the camera module includes the following components: a lens assembly 104 for bending light rays for imaging an object to be photographed onto the photosensitive member 102; a light filter 108 disposed on the upper surface of the supporting member 106 for filtering out infrared light in the environment and eliminating interference to the photosensitive member 102; a carrier 106 for carrying the filter 108 and having the function of a lens 1042; the antireflection element 110 is arranged on the lower surface of the bearing element 106, and reduces the reflection of visible light caused by the bearing element 106 and the air interface below the bearing element; the photosensitive member 102 converts the optical signal into an electrical signal for subsequent processing. Specifically, the filter 108 may be an infrared cut film, the photosensitive element 102 may be a photosensor, and the antireflection element 110 may be an antireflection film.
As shown in fig. 4, in the embodiment of the present application, the carrier 106 is made of a graded index material, and is optically designed together with the lens 1042 module above, so that the last lens of the original lens assembly is replaced by the carrier, thereby achieving the effect of reducing the height of the camera module.
Specifically, the carrier 106 and the lens 1042 module constitute a new lens, which replaces the conventional lens assembly in the related art. Therefore, the number of the lenses 1042 of the lens assembly 104 can be reduced by one, the height of the lens assembly 104 is reduced, and the height of the whole camera module is reduced if the other parts are not changed. In addition, the geometric surface of the carrier 106 is still planar, and thus does not affect the function of the filter 108.
In the camera module provided by the embodiment of the application, as shown in fig. 4, the bearing member 106 with the specially designed graded index is used, the bearing member 106 spatially replaces the bearing member 106 (glass or resin) in the conventional camera module, and functionally replaces the last lens of the lens assembly, so that the height of the lens assembly 104 is reduced, and further the height of the camera module is reduced.
Specifically, the principle of the graded index bearing 106 equivalent lens is illustrated as follows: from the perspective of geometric optics, i.e., light, the physical basis for the lens 1042 to manipulate light is the so-called Snell's law, which can be referred to as the catadioptric theorem. The schematic diagram is shown in fig. 3 (in fig. 3, point a represents an object point, and point B represents an image point). Light is incident from medium 1 to medium 2, niIs the refractive index of medium 1, ntIs the refractive index, k, of medium 20Is the wave vector, θiAnd thetatCorresponding to the incident angle and the refraction angle, respectively, dx is the interface infinitesimal. The dotted line is the normal direction of the interface. The control of the light direction can be realized by changing the normal direction of the interface, namely corresponding to the surface type of the interface. The catadioptric law is pushed to deeper physical essence, and the Fermat principle can be found to correspond to the catadioptric law. The fermat principle, that is, the path of a light ray is the path with the extreme optical path, and the mathematical description thereof is shown in formula (1). Formula (1): δ [ integral ] n (y, z) dl]0; in the formula (1), delta is variation, n is refractive index, y and z are coordinates, and in a corresponding cartesian coordinate system, an xy plane is rotationally symmetrical about the z axis, dl is a path infinitesimal, z is an optical axis direction, and the xy plane is rotationally symmetrical about the z axis.
In conjunction with fig. 3, it can be known from the classical snell's law that:
k0nisinθidx＝k0ntsinθtdx, the final transformation can yield nisinθi＝ntsinθt。
From the fermat principle of this source, it can be found that the way of manipulating the light path not only has the traditional method of interfacial deformation, i.e. bending the lens surface, but also can be realized by controlling the distribution of the medium refractive index. The present application utilizes this point, and comprehensively utilizes two methods for controlling light, and on the basis of the conventional curved lens, the bearing member 106 is also endowed with the function of the lens 1042, so that the bearing member and the lens 1042 in the lens assembly 104 together form the imaging function, and thus, on the basis of not changing the surface type of the bearing member 106, the distribution of the refractive index of the medium can be optimally designed, and the purpose of reducing the number of the conventional lenses 1042 is achieved.
For the ray path we need, the refractive index profile equation is shown in equation (2). y' is the derivative of y with respect to z. Formula (2):
by using equation (2), the refractive index distribution of the graded-index carrier 106 can be solved. A schematic diagram of which is shown in fig. 4. The shades of the colors in the figure represent the difference of the refractive indexes, the deeper the blue color is, the higher the refractive index is, and the transmission path of the light ray therein is a curve. The spatial distribution of the refractive index is rotationally symmetric along the optical axis L, and in addition, it varies with the radial coordinate, such as the Y-axis in fig. 4, and the variation of the refractive index along the Z-axis can be determined according to practical requirements.
In a specific embodiment, the change in refractive index can be achieved by doping, such as in SiO2In which TiO is doped2The change of the refractive index and the doping concentration present a linear relationship, the doping concentration is controlled within 10% (mass percent), the variation of the refractive index of 2% can be realized, and for the bearing part 106 with the thickness of 0.2mm, the phase change of about 7 wavelengths can be realized, which is enough to cover the design requirement of the conventional camera module.
The present application is further illustrated below in three specific embodiments:
the first embodiment is as follows: as shown in fig. 5, the refractive index profile of the carrier 106 may be varied along the optical axis L, the deeper the color the greater the refractive index. By using the infinitesimal method, the bearing member 106 is sliced, and the higher the slicing precision is (in fig. 5, N corresponds to the number of slices in the direction of the optical axis L, and N is larger), the smaller the calculation error is, and actually, according to specific requirements, for example, the optical path variation of each infinitesimal can be set to be one hundredth of the center wavelength, so as to set a specific N value.
Typical conic section refractive index profile:
wherein z is the optical axis, n0Where z is the refractive index at 0, and a is the distribution coefficient. The analytic solution of the corresponding path is as follows:
wherein p is0、l0、m0Is the cosine of the direction of the original ray, x0、y0、z0Is the coordinate of the starting point, here z0＝0。
The second embodiment is as follows: as shown in fig. 6, in a plane perpendicular to the optical axis L, the refractive index of the supporting member 106 gradually changes toward the periphery with the optical axis L as the center, and the deeper the color, the larger the refractive index.
The refractive index is consistent with the shade of the color, as is the case throughout. At this time, the infinitesimal slice is parallel to the optical axis L, the slicing accuracy and the slicing mode are similar, the smaller the calculation error is (N in fig. 6 corresponds to the number of slices in the radial direction of the optical axis L, the larger N is), the smaller the optical path variation amount of each infinitesimal can be actually determined according to specific requirements, for example, the optical path variation amount of each infinitesimal can be set to be one hundredth of the center wavelength,thereby setting a specific N value. For the fundamental quadratic index profile:
the relevant parameters are consistent with those of the first embodiment, and a ray analysis solution can be obtained:
the relevant parameters are consistent with the first embodiment.
The third concrete embodiment: as shown in fig. 7, the refractive index distribution of the supporting member 106 varies along the optical axis L, and in a plane perpendicular to the optical axis L, the refractive index of the supporting member 106 also gradually changes around the optical axis L, and the deeper the color, the larger the refractive index. In this case, binary slicing is required.
M, N in FIG. 7 correspond to the number of slices in the direction of the optical axis L and in the radial direction, respectively, which is also an optical path difference to ensure accuracy of one percent wavelength. This two-dimensional variation allows more freedom in light manipulation, which facilitates greater design optimization of the carrier 106.
The above three embodiments all deal with the carrier 106, so that the number of the lenses 1042 in the lens assembly 104 can be reduced by one.
In addition, as shown in fig. 8, the embodiment of the present application further provides a further implementation scheme, which is specifically as follows:
as shown in fig. 8, the glass cover plate 112 over the lens assembly 104 and the camera module carrier 106 are replaced with graded index (by doping). Thus, the glass cover 112 and the carrier 106 will be given the function of the lens 1042, the glass cover 112 can replace the first lens of the lens assembly in the related art, and the carrier 106 can replace the last lens of the lens assembly, which can reduce the number of lenses 1042 in the lens assembly 104 by two.
Specifically, as shown in fig. 8, the camera module further includes a housing 114, and the glass cover plate 112 is disposed on the housing 114 and above the lens assembly 104. A first magnetic member 116 is disposed on the housing 114, a second magnetic member 118 is disposed on the lens assembly 104, and the first magnetic member 116 and the second magnetic member 118 cooperate to ensure that the relative position of the lens assembly 104 is stable.
Therefore, the embodiment of the present application can reduce the number of the lenses 1042 in the lens assembly 104, and can reduce the height of the camera module. For example, the three embodiments described above can reduce the use of one lens 1042 and achieve the improvement of 7P lens to 6P lens, while the advanced scheme can reduce the use of two lenses 1042 and achieve the improvement of 7P lens to 5P lens. In addition, the glass cover plate 112 is changed into the glass cover plate 112 with the gradually-changing refractive index, and the glass cover plate 112 forms a part of the camera module, so that the overall temperature drift performance of the camera module can be remarkably improved.
In the description herein, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.
Claims (11)
1. The camera module is characterized by comprising a photosensitive piece, a lens assembly and a bearing piece, wherein the lens assembly is arranged at the top of the photosensitive piece, the bearing piece is arranged between the lens assembly and the photosensitive piece, the refractive index of the bearing piece is gradually changed, the propagation path of light rays emitted from the lens assembly in the bearing piece is a curve, and the light rays penetrate through the bearing piece and then irradiate to the photosensitive piece.
2. The camera module of claim 1,
the bearing piece is a bearing sheet, and the optical axis of the lens component is perpendicular to the bearing sheet.
3. The camera module of claim 2,
the refractive index of any position on the bearing member in the extending direction of the optical axis is negatively related to the distance from the position to the center of the bearing member.
4. The camera module of claim 2,
the refractive index of any position on the carrier in a plane perpendicular to the optical axis is negatively related to the distance of that position from the optical axis.
5. The camera module of any of claims 2-4,
in the extending direction of the optical axis, the refractive index of the bearing piece is gradually changed.
6. The camera module of any of claims 2-4,
in a plane perpendicular to the optical axis, the refractive index of the bearing piece gradually changes towards the periphery by taking the optical axis as a center.
7. The camera module of any of claims 2-4,
the refractive index of the bearing piece is gradually changed in the extending direction of the optical axis;
in a plane perpendicular to the optical axis, the refractive index of the bearing piece gradually changes towards the periphery by taking the optical axis as a center.
8. The camera module of any of claims 1-4,
the lens assembly comprises a plurality of lenses which are arranged in a stacked mode, and the light rays are emitted to the photosensitive piece under the action of the lenses and the bearing piece.
9. The camera module of any of claims 1-4,
the camera module further comprises a light filtering piece and an anti-reflection piece, wherein the light filtering piece is supported on the bearing piece, and the anti-reflection piece is arranged on one side, facing the photosensitive piece, of the bearing piece.
10. The camera module of any one of claims 1-4, further comprising a glass cover plate covering the top of the lens assembly, wherein the glass cover plate has a graded index of refraction, and the light rays have a curved path of propagation within the glass cover plate.
11. An electronic device, comprising:
a camera module according to any one of claims 1 to 10.
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| CN113556418A (en) * | 2021-07-22 | 2021-10-26 | 维沃移动通信有限公司 | Electronic device |
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| CN113079304B (en) | 2023-01-31 |
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