CN112882143A - Microprism, camera module and electronic equipment - Google Patents

Microprism, camera module and electronic equipment Download PDF

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Publication number
CN112882143A
CN112882143A CN202110105729.5A CN202110105729A CN112882143A CN 112882143 A CN112882143 A CN 112882143A CN 202110105729 A CN202110105729 A CN 202110105729A CN 112882143 A CN112882143 A CN 112882143A
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China
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layer
microprism
surface layer
diffractive structure
micro
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彭士玮
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Vivo Mobile Communication Co Ltd
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Vivo Mobile Communication Co Ltd
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Priority to CN202110105729.5A priority Critical patent/CN112882143A/en
Publication of CN112882143A publication Critical patent/CN112882143A/en
Priority to PCT/CN2022/073068 priority patent/WO2022161262A1/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • G02B5/06—Fluid-filled or evacuated prisms
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/18—Diffraction gratings
    • G02B5/1814—Diffraction gratings structurally combined with one or more further optical elements, e.g. lenses, mirrors, prisms or other diffraction gratings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/18—Diffraction gratings
    • G02B5/1842—Gratings for image generation
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/18—Diffraction gratings
    • G02B5/1866—Transmission gratings characterised by their structure, e.g. step profile, contours of substrate or grooves, pitch variations, materials
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/02—Bodies
    • G03B17/12—Bodies with means for supporting objectives, supplementary lenses, filters, masks, or turrets

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)

Abstract

The application discloses microprism, module and electronic equipment of making a video recording, above-mentioned microprism includes: the micro-prism lens comprises a top surface layer, a bottom surface layer and an optical liquid layer arranged between the top surface layer and the bottom surface layer; a stamping glue layer is arranged on one side of the top surface layer or the bottom surface layer, which is far away from the optical liquid layer; under the condition that the imprinting adhesive layer is positioned on the top surface layer, a diffraction structure for diffracting light is constructed on one side of the imprinting adhesive layer away from the top surface layer; in the case of an embossing lacquer layer on the base layer, a diffractive structure is formed on the side of the embossing lacquer layer facing away from the base layer for diffracting light. The imprinting adhesive layer containing the diffraction structure is directly imprinted on one side surface of the micro-prism lens, and the micro-prism modulates the light field through the diffraction structure, so that on one hand, the function of eliminating chromatic aberration is added besides the function of originally changing the light path, and the imaging quality is improved; on the other hand, lenses for balancing chromatic aberration can be reduced, so that the requirement for miniaturization of the anti-shake mechanism is met.

Description

Microprism, camera module and electronic equipment
Technical Field
The application belongs to the technical field of electron, concretely relates to microprism, module and electronic equipment make a video recording.
Background
With the development of technology, the performance of electronic devices is continuously optimized, and accordingly, the demands of users on the shooting performance of electronic devices are higher and higher. The camera is the indispensable device in electronic equipment today, along with the consumer to the continuous promotion of the demand of shooing, in order to promote formation of image quality, has to increase the size of camera module, and anti-shake mechanism is also continuous to be enlarged to realize better optical performance, this makes camera module size especially highly constantly increase.
In the correlation technique, microprism is as a part of the anti-shake mechanism of the module of making a video recording, and its structure is comparatively simple, and required thrust is also comparatively few, realizes this application in-process, and the inventor finds that there is following problem at least among the prior art: the inherent chromatic aberration problem of the microprisms makes it difficult to meet the increasing demands for high image quality and miniaturization.
Disclosure of Invention
The application aims at providing a microprism, a camera module and electronic equipment, and can solve the problems of chromatic aberration and large size when the microprism is used.
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 micro prism, including: a microprism lens comprising a top surface layer, a bottom surface layer, and a layer of optical liquid disposed between the top surface layer and the bottom surface layer;
a stamping glue layer is arranged on one side, far away from the optical liquid layer, of the top surface layer or the bottom surface layer;
under the condition that the imprinting adhesive layer is positioned on the top surface layer, a diffraction structure for diffracting light is constructed on one side, away from the top surface layer, of the imprinting adhesive layer;
and under the condition that the imprinting glue layer is positioned on the bottom surface layer, a diffraction structure for diffracting light is constructed on one side of the imprinting glue layer away from the bottom surface layer.
According to the microprism provided by the embodiment of the application, the surface of the diffraction structure is in a concave-convex shape.
According to the microprism provided by the embodiment of the present application, the diffractive structure has a sawtooth shape formed by arranging a plurality of teeth.
According to the microprism provided by the embodiment of the present application, the widths of the plurality of teeth gradually decrease from the center to the edge.
According to the microprism provided by the embodiment of the application, the width is less than 300 μm and more than 0.35 μm.
According to the microprism provided by the embodiment of the application, the reference surface of the diffraction structure is a plane, a spherical surface or an aspheric surface;
in the case where the reference surface of the diffractive structure is aspherical, the reference surface height xbAnd the distance r of the light ray from the optical axis satisfies the following expression:
Figure BDA0002917600470000021
wherein c is the curvature of the reference plane, K is the conic constant, A2nIs an aspheric coefficient to the power of 2 n.
According to the microprism provided by the embodiment of the present application, in the case that the reference surface of the diffraction structure is aspheric, the optical path Φ generated by the diffraction structure satisfies the following expression:
φ＝(C2r2+C4r4+C6r6+…+C2nr2n)×2π/λ
wherein r is the distance of the light from the optical axis, C2nIs a phase coefficient of 2n power, and λ is a wavelength.
According to the microprism provided by the embodiment of the present application, in the case that the reference surface of the diffractive structure is aspheric, the distance x from the reference surface of the diffractive structure satisfies the following expression:
x＝(n-φ/2π)×hd
wherein n is the number of diffraction zones of the diffraction structure counted from the center to the outer side, phi is the optical path generated by the diffraction structure, hdIs the maximum height of the diffractive structure calculated by scalar diffraction theory.
According to the microprism provided by the embodiment of the application, the height of the diffraction structure is less than or equal to the thickness of the imprinting glue layer.
According to the microprism provided by the embodiment of the application, the thickness h of the imprinting adhesive layeriSatisfies the 0.5 μm<hi<200 μm, height h of the diffractive structuredSatisfies the 0.1 μm<hd<50μm。
According to the microprism provided by the embodiment of the application, the refractive indexes of the optical liquid layer and the imprinting glue layer are both 1.35 to 1.8.
In a second aspect, an embodiment of the present application provides a camera module, including: the lens group, the optical filter and the photoelectric sensor are sequentially arranged;
the camera module further comprises the micro prism, the micro prism is arranged between the lens group and the optical filter, and the diffraction structure faces to one side where the lens group is located.
In a third aspect, an embodiment of the present application provides a camera module, including: the optical path turning piece, the lens group, the optical filter and the photoelectric sensor are sequentially arranged;
the camera module further comprises the micro prism, the micro prism is arranged between the lens group and the optical filter, and the diffraction structure faces to one side where the lens group is located.
In a fourth aspect, an embodiment of the present application provides an electronic device, including: the camera module is provided.
In the embodiment of the application, the imprinting adhesive layer containing the diffraction structure is directly imprinted on one side surface of the micro-prism lens, and the micro-prism containing the diffraction structure modulates the light field through the diffraction structure, so that on one hand, the function of chromatic aberration elimination is added besides the function of originally changing the light path, and the imaging quality is improved; on the other hand, lenses for balancing chromatic aberration can be reduced, so that the requirement for miniaturization of the anti-shake mechanism is met.
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 diagram of a microprism according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a diffractive structure according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a camera module according to an embodiment of the present disclosure;
fig. 4 is a second schematic diagram of a camera module according to an embodiment of the present application;
reference numerals:
101: a lens group; 102: a microprism;
1021: an interface; 1022: a reference plane;
1023: imprinting the adhesive layer; 1024: a top surface layer;
1025: an optical liquid layer; 1026: a bottom surface layer;
1027: a diffractive structure; 103: an optical filter;
104: a photosensor; 105: cover plate glass;
106: the light path turning member.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like 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 of the present application, it is to be understood that the terms "central," "longitudinal," "transverse," "thickness," "radial," "circumferential," and the like are used in the positional or orientational relationships indicated in the drawings for the purpose of convenience in describing the present application and simplifying the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
A microprism according to an embodiment of the present application is described below in conjunction with fig. 1-2.
As shown in fig. 1, a microprism 102 according to some embodiments of the present application comprises: a microprismatic lens comprising a top surface layer 1024, a bottom surface layer 1026, and an optical liquid layer 1025 disposed between the top surface layer 1024 and the bottom surface layer 1026.
An embossing glue layer 1023 is arranged on one side of the micro-prism lens, and a diffraction structure 1027 for diffracting light is constructed on one side of the embossing glue layer 1023 far away from the micro-prism lens.
The micro-prism lens may be a filter, and the micro-prism lens has opposite side surfaces, wherein one side surface facing the object side is named as a left side surface, and the other side surface facing the image side is named as a right side surface. The embossed adhesive layer 1023 may be disposed on the left side or the right side, and is not limited in particular.
That is, the embossed adhesive layer 1023 may be provided on either the top 1024 or bottom 1026 layers.
Specifically, an imprinting glue layer 1023 is provided on a side of the top surface layer 1024 remote from the optical liquid layer 1025, and, in the case where the imprinting glue layer 1023 is located on the top surface layer 1024, a diffractive structure 1027 for diffracting light is configured on a side of the imprinting glue layer 1023 remote from the top surface layer 1024.
Alternatively, an imprinting glue layer 1023 is provided on the side of the bottom surface layer 1026 remote from the optical liquid layer 1025, and, in the case where the imprinting glue layer 1023 is located on the bottom surface layer 1026, a diffractive structure 1027 for diffracting light is configured on the side of the imprinting glue layer 1023 remote from the bottom surface layer 1026.
The following description will be given taking an example in which the embossed adhesive layer 1023 is disposed on the left side, that is, the embossed adhesive layer 1023 is disposed on the top surface layer 1024. The diffractive structure 1027 is formed on the side of the embossed adhesive layer 1023 away from the left side of the microprism lens, and the projected area of the embossed adhesive layer 1023 on the left side is matched with the area of the left side. For miniaturization of the overall structure, the shape and size of the imprinting glue layer 1023 need to be designed according to the parameters of the diffractive structure 1027.
The imprinting glue layer 1023 is made of solvent-free ultraviolet curing acrylic resin and is transparent, so that the integral transmittance of the microprism is not affected; the material of the imprinting adhesive layer 1023 may also be visible light cured resin or thermosetting resin, and the material of the imprinting adhesive layer 1023 is not specifically limited herein and may be selected according to actual working conditions.
The manufacturing method of the diffraction structure specifically comprises the following steps: the left side of the microprism lens is directly imprinted with an imprinting glue layer 1023 containing diffractive structures 1027, and the diffractive structures 1027 on the imprinting glue layer 1023 can be transferred from the microstructure of the imprinted mold.
The imprinting glue layer 1023 containing the diffraction structure 1027 is directly imprinted on the top surface layer 1024 or the bottom surface layer 1026, so that the material cost can be reduced, namely, under the condition that different diffraction structures 1027 are needed, the imprinting glue layer 1023 containing the diffraction structure 1027 can be directly replaced without replacing a micro-prism lens; and the process difficulty of imprinting the micron-sized diffraction structure on the plane is not high, so that the method is suitable for mass production.
Because the refraction of the diffraction structure 1027 and the microprism lens to light rays is reversible, visible light can be well converged after passing through the diffraction structure 1027 and the microprism lens, so that the problem that chromatic aberration is serious due to the fact that light with different colors cannot be converged can be solved. In addition, since the diffractive structure 1027 is opposite to the chromatic aberration generated by the micro-prism lens, the chromatic aberration can be eliminated well, and the chromatic aberration offset effect can be improved finally.
According to the microprism of the embodiment of the application, the imprinting adhesive layer 1023 containing the diffraction structure 1027 is directly imprinted on one side surface of the microprism lens, and the microprism containing the diffraction structure 1027 modulates the light field through the diffraction structure 1027, so that on one hand, the function of eliminating chromatic aberration is added besides the function of originally changing the light path, and the imaging quality is improved; on the other hand, lenses for balancing chromatic aberration can be reduced, so that the requirement for miniaturization of the anti-shake mechanism is met.
According to other embodiments of the present application, the surface of the diffractive structure 1027 is concave-convex, and light is incident on the micro-prisms 102 from the surface of the diffractive structure 1027 toward the optical axis direction. Here, the surface of the diffractive structure 1027 refers to a surface on which light is incident, i.e., a surface in contact with air, and a region between the surface of the diffractive structure 1027 and the air may be referred to as an interface 1021.
The optical axis direction is the same as the height direction of the diffractive structure 1027, and the optical axis direction is also the same as the thickness direction of the imprinting glue layer 1023. For convenience of explanation, directions of two surfaces perpendicular to the optical axis direction are defined as a lateral direction and a longitudinal direction, respectively.
The diffractive structure 1027 has a symmetrical shape with respect to the optical axis. The specific shape of the diffractive structure 1027 can be selected according to actual conditions, and is not limited herein.
Alternatively, the diffractive structure 1027 has a saw-tooth shape having a plurality of tooth portions arranged.
Among them, the zigzag shape on the diffraction structure 1027 has various forms. For example, a plurality of teeth are sequentially arranged in the longitudinal direction of the embossed glue layer 1023, and each tooth extends in the transverse direction of the embossed glue layer 1023; alternatively, a plurality of teeth are sequentially arranged in the transverse direction of the embossed glue layer 1023, and each tooth extends in the longitudinal direction of the embossed glue layer 1023.
The following description will be given taking as an example that a plurality of teeth are sequentially arranged in the longitudinal direction of the embossed glue layer 1023, and each tooth extends in the transverse direction of the embossed glue layer 1023.
The sawtooth-shaped diffractive structure 1027 comprises a first type of teeth with a semicircular cross-section. The teeth of the first type have a defined diameter, the center of which lies on the optical axis. Further, a plurality of second-type teeth are formed on the outer periphery of the first-type teeth. Each tooth of the second type is formed so that a side surface on a side close to the optical axis is vertical, and a side surface on a side distant from the optical axis is a gently curved surface.
Alternatively, the overall shape of the diffractive structure 1027 viewed from the optical axis direction is a circular shape, one first-type tooth and a plurality of second-type teeth are arranged in a concentric circle shape, that is, the plurality of second-type teeth are arranged in the radial direction, and each second-type tooth extends in the circumferential direction.
Further, in order to improve the effect of the micro prism to remove chromatic aberration, the widths of the plurality of teeth are gradually decreased from the center to the edge.
Note that the width of each tooth portion of the second type, i.e., the width in the longitudinal direction, is set to be smaller as it goes away from the optical axis. At this time, the diameter of the first type of teeth is larger than the width of each of the second type of teeth.
Specifically, the width of each tooth is less than 300 μm and greater than 0.35 μm. In the case of a width of 200 μm, the number of teeth of the diffraction structure 1027 formed on the left side surface of the imprinting glue layer 1023 can satisfy the maximization effect of improving the chromatic aberration elimination of the microprism, and the processing of the diffraction structure 1027 is convenient at this time.
As shown in fig. 2, according to further embodiments of the present application, the reference surface 1022 of the diffractive structure 1027 is a plane, a sphere or an aspheric surface, and the specific surface type is determined by optimization according to requirements and is not limited herein.
When the reference surface 1022 of the diffractive structure is aspheric, the reference surface height xbAnd the distance r of the light ray from the optical axis satisfies the following expression:
Figure BDA0002917600470000071
wherein c is the curvature of the reference plane, K is the conic constant, A2nIs an aspheric coefficient to the power of 2 n.
In the case where the reference surface of the diffractive structure is aspheric, the optical path φ produced by the diffractive structure 1027 satisfies the following expression:
φ＝(C2r2+C4r4+C6r6+…+C2nr2n)×2π/λ
wherein r is the distance of the light from the optical axis, C2nIs a phase coefficient of 2n power, and λ is a wavelength.
In the case where the reference surface 1022 of the diffractive structure 1027 is aspheric, the diffractive structure 1027 is a distance x from the reference surface that satisfies the following expression:
x＝(n-φ/2π)×hd
wherein n is the number of diffraction zones of the diffraction structure counted from the center to the outer side, phi is the optical path generated by the diffraction structure, hdIs the maximum height of the diffractive structure calculated by scalar diffraction theory.
According to still other embodiments of the present application, the height of the diffractive structure 1027 is less than or equal to the thickness of the embossed glue layer 1023.
It should be noted that, in order to reduce the volume of the micro-prism structure, the height of the diffractive structure 1027 may be equal to the thickness of the imprinting glue layer 1023 without affecting the optical path change and chromatic aberration elimination of the diffractive structure 1027.
According to still other embodiments of the present application, the thickness h of the embossed glue layer 1023iSatisfies the 0.5 μm<hi<200 μm, height h of the diffractive structure 1027dSatisfies the 0.1 μm<hd<50μm。
Note that the thickness h of the embossed adhesive layer 1023iIs selected according to the height h of the diffractive structure 1027dI.e. the required diffractive structures 1027 for the microprisms can be formed on the embossed glue layer 1023. In order to facilitate forming the diffractive structure 1027, a certain thickness margin may be left in the imprinting glue layer 1023 to improve the forming probability of the diffractive structure 1027.
It is understood that since the 1 st order diffraction is the order of the diffraction for image formation and the other orders of diffraction may be flare light to adversely affect the image formation, the flare phenomenon is reduced so as to maximize the efficiency of the 1 st order diffraction, and the height h of the diffraction layerdNeeds to satisfy 0.1 μm<hd<50 μm. Wherein the height h of the diffraction layerdRefractive index n by embossing glue layer 1023iAnd refractive index n of airAirThe difference is determined by scalar diffraction theory calculation.
According to further embodiments of the present application, the refractive index n of the optical liquid layer 1025kAnd refractive index n of the embossed glue layer 1023iAre all 1.35 to 1.8.
It should be noted that the refractive index of optical liquid layer 1025 and the refractive index of imprinting glue layer 1023 may be the same, or the refractive indices of both may be different according to actual conditions, and the refractive indices of both are not specifically limited herein. The optical liquid layer 1025 may be methyl silicone oil, and the top layer 1024 and the bottom layer 1026 may be made of optical plastic or glass.
As shown in fig. 3, a camera module according to further embodiments of the present application includes: the lens group 101, the optical filter 103 and the photoelectric sensor 104 are arranged in sequence.
The camera module further includes the micro-prism 102, the micro-prism 102 is disposed between the lens group 101 and the filter 103, and the diffractive structure 1027 faces to a side where the lens group 101 is located.
The image pickup module includes a lens group 101, a micro-prism 102, a filter 103, and a photoelectric sensor 104, which are coaxially arranged in order from an object side to an image side. Incident light beams firstly pass through the micro prism 102 after being imaged by the lens group 101, and further modulate a light field through the diffraction structure 1027 on the micro prism lens, so that parameters such as field curvature and chromatic aberration are improved, and the imaging quality is improved; the image processed by the micro prism 102 is filtered by the optical filter 103 to absorb the infrared light, and the light beam is finally imaged on the photoelectric sensor 104.
In the embodiment of the present application, the diffractive structure 1027 on the micro-prism lens is matched with the lens group 101 in the camera module, and high imaging quality is finally achieved through matching of refraction and diffraction; the micro prism containing the diffraction structure 1027 is used for eliminating the aberration of the camera module, so that the imaging quality of the camera module is improved, and meanwhile, the number of lenses used for balancing the aberration originally can be reduced, the total optical path length of the camera module is shortened, and miniaturization is realized; moreover, the anti-shake effect of the microprism 102 is smaller than the anti-shake effect of a lens set in the prior art, and the complexity of the camera module can be effectively reduced.
It can be understood that the reference surface 1022 of the diffraction structure 1027 on the microprism lens in the camera module adopts an aspheric surface, so that the design of the camera module is more flexible, the imaging quality of the camera module is more effectively improved, and the miniaturization requirement of the camera module is met.
As shown in fig. 4, a camera module according to other embodiments of the present application includes: the optical path turning piece 106, the lens group 101, the optical filter 103 and the photoelectric sensor 104 are sequentially arranged;
the camera module further includes the micro-prism 102, the micro-prism 102 is disposed between the lens group 101 and the filter 103, and the diffractive structure 1027 faces to a side where the lens group 101 is located.
It should be noted that the image capturing module can be a periscopic image capturing module, which includes a light path turning member 106, a lens set 101, a micro-prism 102, a filter 103, and a photoelectric sensor 104, which are coaxially arranged in sequence from an object side to an image side. A cover glass 105 is further disposed on the object side of the optical path turning member 106.
After penetrating through the cover glass 105, an incident light beam firstly changes the propagation direction of a light path through the light path turning piece 106, then enters the lens group 101, and after the lens group 101 is imaged, the incident light beam passes through the micro prism 102, and further modulates a light field through the diffraction structure 1027 on the micro prism lens, so that the parameters of field curvature, chromatic aberration and the like are improved, and the imaging quality is improved; the image processed by the micro prism 102 is filtered by the optical filter 103 to absorb the infrared light, and the light beam is finally imaged on the photoelectric sensor 104.
In the embodiment of the application, the diffractive structure 1027 on the micro-prism lens is matched with the lens in the camera module, and high imaging quality is finally realized through matching of refraction and diffraction; the micro prism containing the diffraction structure 1027 is used for eliminating the aberration of the camera module, so that the imaging quality of the camera module is improved, and meanwhile, the number of lenses used for balancing the aberration originally can be reduced, the total optical path length of the camera module is shortened, and miniaturization is realized; moreover, the anti-shake effect of the microprism 102 is smaller in required thrust compared with the anti-shake effect of the light path turning piece in the prior art, and the complexity of the camera module can be effectively reduced.
It can be understood that the datum plane 1022 of the diffraction structure 1027 on the microprism lens in the periscopic camera module can adopt an aspheric surface, so that the design of the camera module is more flexible, the more effective imaging quality of the camera module is improved, and the miniaturization requirement of the camera module is met. In order to make the imprinting process of the diffractive structure 1027 simpler and easier to design, the reference surface 1022 of the diffractive structure 1027 on the microprism lens in the camera module may be a flat surface.
According to other embodiments of the present application, an electronic apparatus includes the camera module.
In the module of making a video recording, because the microprism can play the effect of better elimination colour difference, consequently need not to offset the colour difference through setting up more lenses, this is favorable to reducing the volume of camera lens undoubtedly to make the module of making a video recording more be fit for installing in the space that is comparatively compelling in electronic equipment.
According to the electronic equipment of the embodiment of the application, the camera module is used in the electronic equipment, so that the size of the electronic equipment can be minimized as far as possible while the increasing requirements on high camera quality and anti-shake are met.
Of course, in the embodiments of the present application, the electronic device includes, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a palm computer, a vehicle-mounted terminal, a wearable device, a pedometer, and the like. The embodiment of the present application does not specifically limit the specific type of the electronic device.
Reference throughout this specification to the description of "some embodiments," "other embodiments," or "further embodiments" means that a particular feature, structure, material, or characteristic described in connection with the embodiments or examples 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 (14)

1. A microprism, comprising: a microprism lens comprising a top surface layer, a bottom surface layer, and a layer of optical liquid disposed between the top surface layer and the bottom surface layer;
a stamping glue layer is arranged on one side, far away from the optical liquid layer, of the top surface layer or the bottom surface layer;
under the condition that the imprinting adhesive layer is positioned on the top surface layer, a diffraction structure for diffracting light is constructed on one side, away from the top surface layer, of the imprinting adhesive layer;
and under the condition that the imprinting glue layer is positioned on the bottom surface layer, a diffraction structure for diffracting light is constructed on one side of the imprinting glue layer away from the bottom surface layer.
2. The microprism of claim 1, wherein the surface of the diffractive structure is concave-convex.
3. The microprism of claim 2, wherein the diffractive structure has a saw-tooth shape having a plurality of teeth arranged therein.
4. The microprism of claim 3, wherein the teeth have a width that gradually decreases from the center to the edge.
5. Microprism according to claim 4, wherein the width is less than 300 μm and greater than 0.35 μm.
6. The microprism of claim 2, wherein the reference surface of the diffractive structure is planar, spherical or aspherical;
in the case where the reference surface of the diffractive structure is aspherical, the reference surface height xbAnd lightThe distance r of the line from the optical axis satisfies the following expression:
Figure FDA0002917600460000011
wherein c is the curvature of the reference plane, K is the conic constant, A2nIs an aspheric coefficient to the power of 2 n.
7. The microprism of claim 6, wherein, in the case where the reference surface of the diffractive structure is aspheric, the diffractive structure produces an optical path φ that satisfies the following expression:
φ＝(C2r2+C4r4+C6r6+…+C2nr2n)×2π/λ
wherein r is the distance of the light from the optical axis, C2nIs a phase coefficient of 2n power, and λ is a wavelength.
8. The microprism of claim 6, wherein, in the case where the reference surface of the diffractive structure is aspheric, the diffractive structure is at a distance x from the reference surface satisfying the following expression:
x＝(n-φ/2π)×hd
wherein n is the number of diffraction zones of the diffraction structure counted from the center to the outer side, phi is the optical path generated by the diffraction structure, hdIs the maximum height of the diffractive structure calculated by scalar diffraction theory.
9. The microprism of any of claims 1 to 8, wherein the height of the diffractive structure is less than or equal to the thickness of the layer of embossing glue.
10. Microprism according to claim 9, wherein the embossing glue layer has a thickness hiSatisfies the 0.5 μm<hi<200 μm, height h of the diffractive structuredSatisfies the 0.1 μm<hd<50μm。
11. The microprism of any of claims 1 to 8, wherein the refractive index of each of the optical liquid layer and the imprinting glue layer is between 1.35 and 1.8.
12. The utility model provides a module of making a video recording which characterized in that includes: the lens group, the optical filter and the photoelectric sensor are sequentially arranged;
the camera module further comprises the micro-prism according to any one of claims 1 to 11, the micro-prism is arranged between the lens group and the optical filter, and the diffraction structure faces to the side where the lens group is located.
13. The utility model provides a module of making a video recording which characterized in that includes: the optical path turning piece, the lens group, the optical filter and the photoelectric sensor are sequentially arranged;
the camera module further comprises the micro-prism according to any one of claims 1 to 11, the micro-prism is arranged between the lens group and the optical filter, and the diffraction structure faces to the side where the lens group is located.
14. An electronic device, comprising: a camera module according to claim 12 or 13.
CN202110105729.5A 2021-01-26 2021-01-26 Microprism, camera module and electronic equipment Pending CN112882143A (en)

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