CN112202991B - Camera module, electronic equipment, optical element and preparation method of camera module - Google Patents
Camera module, electronic equipment, optical element and preparation method of camera module Download PDFInfo
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- CN112202991B CN112202991B CN202010983123.7A CN202010983123A CN112202991B CN 112202991 B CN112202991 B CN 112202991B CN 202010983123 A CN202010983123 A CN 202010983123A CN 112202991 B CN112202991 B CN 112202991B
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- H—ELECTRICITY
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- 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
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/54—Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
The application discloses make a video recording module, electronic equipment and optical element and the preparation method of making a video recording module, make a video recording the module and include the lens battery, optical element, image sensor and treater, optical element locates in the Fourier transform plane between two lenses, image sensor receives the image light after optical element reduces diffraction and converts image light into first image signal, first image signal is used for transmitting the convolution filter in the treater and carries out deconvolution filtering processing in order to compensate the blurring and obtain the second image signal. Diffraction of light passing through the camera module is reduced by arranging optical elements in the fourier transform planes of the two lenses. The image light after reducing diffraction is received by the image sensor and is converted into a first image signal through the image sensor, so that the first image signal is conveniently subjected to deconvolution filtering processing to further compensate blurring to obtain a second image signal, and the shooting module can reduce diffraction of the light passing through the camera module.
Description
Technical Field
The application relates to the technical field of electronic equipment, in particular to a camera module, electronic equipment, an optical element and a preparation method of the camera module.
Background
Along with people's requirement for the aesthetic feeling of electronic equipment is higher and higher, locate the module of making a video recording under the electronic equipment screen, the light that the module of making a video recording received or launched passes through the screen, because there are a plurality of pixel units along horizontal and vertical periodic arrangement on the screen, a plurality of pixel units have constituted periodic pixel diffraction structure, consequently can produce the diffraction effect to the light of incidenting, finally lead to setting up the projection or the image quality decline of the module of making a video recording at the screen back.
Disclosure of Invention
The application provides a camera module, electronic equipment, an optical element and a preparation method of the camera module, and the structure of the camera module is considered to be optimized, so that the shooting quality of an electronic device provided with the camera module is improved.
In a first aspect, the present application provides a camera module comprising a lens assembly, an optical element, an image sensor, and a processor. The lens group comprises a first group of lenses and a second group of lenses, and each group of lenses comprises at least one lens; the optical element is arranged in a Fourier transform plane between the first group of lenses and the second group of lenses and is used for reducing diffraction of light rays passing through the optical element; the image sensor is arranged in an imaging surface of the camera module, receives image light after the diffraction of the optical element is reduced and converts the image light into a first image signal; the processor comprises a convolution filter, and the convolution filter is used for carrying out deconvolution filtering processing on the first image signal to compensate the blurring to obtain a second image signal.
Based on the module of making a video recording that this application embodiment provided, through set up optical element in the Fourier transform plane of two lenses and reduce the diffraction through the module light of making a video recording. The image light after reducing diffraction is received by the image sensor and is converted into a first image signal through the image sensor, so that the first image signal is conveniently subjected to deconvolution filtering processing to further compensate blurring to obtain a second image signal, and the shooting module can reduce diffraction of the image light inside the shooting module.
In some embodiments, the camera module further comprises an aperture stop disposed in the fourier transform plane, the optical element being mounted on the aperture stop.
Based on the above embodiment, the optical element is installed opposite to the light-passing hole of the aperture stop, the inner diameter of the light-passing hole of the aperture stop should be greater than or equal to the peripheral size of the optical element, and further, the aperture of the light-passing hole of the aperture stop should be greater than or equal to the outer diameter of the area for the diffracted light to pass through on the optical element, so as to prevent the edge of the aperture stop from blocking the diffracted light to pass through, and influence the optical element on reducing the light diffraction effect.
In some embodiments, the optical element is a diffractive optical element comprising a transparent substrate and a diffractive layer disposed on the transparent substrate; the diffraction image layer comprises a plurality of annular step structures used for reducing diffraction, the annular step structures are located in a plane parallel to the surface of the transparent substrate, and the annular step structures are coaxially and integrally arranged by taking the optical axis of the lens group as a central axis.
Based on the above embodiment, when the diffracted light of different frequency bands passes through the step structures at the corresponding positions on the diffraction layer, the annular step structures can superpose the light of the same frequency band with the phase difference of 90 degrees to eliminate the phase difference, so that the light diffraction is reduced, and the effect of eliminating the diffraction appears as weak light spots on the image collector.
In some embodiments, the diameter range of the annular step structure located at the outermost periphery in a plane parallel to the transparent substrate plate surface is greater than or equal to 1 mm and less than or equal to 3 mm, and the diameter error range of the annular step structure is ± 1.5 micrometers; the thickness range of the annular step structure is greater than or equal to 1 micrometer and less than or equal to 800 micrometers in the direction perpendicular to the surface of the transparent substrate.
Based on the above embodiment, in this specification range, the manufactured optical element can be applied to camera modules with various specification requirements, and the processing of the optical element is also facilitated.
In some embodiments, the annular step structure has a light transmittance in the range of 50% to 92%.
Based on the above embodiment, the annular step structure with the transmittance of 50% -92% can satisfy the condition of reducing light diffraction.
In some embodiments, the optical element is a light barrier having a light passing aperture in the center.
Based on the above embodiment, the aperture of the light through hole in the center of the light barrier can be directly changed to change the light flux of the light barrier for blocking light to pass through, so that the effect of the light barrier on reducing light diffraction can be conveniently regulated and controlled, and the process of reducing light diffraction by changing the structure of the optical element is easy to operate.
In a second aspect, an embodiment of the present application provides an electronic device, which includes a screen and the camera module described above. A pixel layer is arranged on the screen. The camera is installed in the one side at the pixel layer place of screen, and the module of making a video recording is used for receiving the diffraction light that obtains after passing the pixel layer.
Based on the electronic equipment that this application embodiment provided, will make a video recording the module and install under the screen, the module of making a video recording receives the diffraction light that passes screen pixel layer, reduces the light diffraction that passes screen pixel layer through the inside optical element of the module of making a video recording for the electronic equipment who installs this module of making a video recording also has good visualization effect.
In a third aspect, an embodiment of the present application provides a method for manufacturing an optical element of an electronic device, including the following steps:
providing an original optical element, a lens group and an image sensor, wherein the lens group comprises a first group of lenses and a second group of lenses;
arranging a first group of lenses, a second group of lenses and an image sensor along the direction of an optical axis in sequence, and arranging an original optical element in a Fourier transformation plane between the first group of lenses and the second group of lenses;
the image sensor collects first light rays passing through the first group of lenses, the original optical element and the second group of lenses;
and correcting the original optical element structure according to the diffraction light spot condition of the first light until the image sensor obtains the first light without diffraction light spots, namely obtaining the optical element capable of reducing diffraction.
According to the method for manufacturing the optical element of the electronic device, the optical element is arranged in the Fourier transformation plane, the original optical element structure is corrected according to the diffraction light spot condition of the image light rays passing through the lens group and the optical element, and the optical element capable of reducing diffraction is obtained until the image light rays without the diffraction light spots are obtained by the image sensor.
In some embodiments, the original optical element is a diffractive optical element, the diffractive optical element includes a transparent substrate and a diffractive layer disposed on the transparent substrate, and the diffractive layer includes a plurality of annular step structures for reducing diffraction;
prior to placing the original optical element in a fourier transform plane between the first set of lenses and the second set of lenses, further comprising:
providing a screen and a processor, and placing the first group of lenses, the second group of lenses and the image sensor under the screen, wherein the image sensor is connected with the processor;
providing incident light, enabling the incident light to sequentially pass through a pixel layer, a first group of lenses and a second group of lenses on a screen, receiving and converting the incident light into image signals by an image sensor, and transmitting the image signals to a processor, and analyzing the image signals by the processor to obtain the light intensity distribution and the Fourier transform function of the incident light;
based on Fourier transform function, the processor performs Fourier transform on the acquired image signal to obtain Fourier space distribution of incident light;
acquiring diffraction layer structure parameters of the original optical element according to Fourier space distribution and light intensity distribution of incident light, and preparing the original optical element according to the diffraction layer structure parameters of the original optical element;
after placing the original optical element in a fourier transform plane between the first set of lenses and the second set of lenses, further comprising:
the processor obtains an inverse Fourier transform function based on the Fourier transform function;
after the image sensor obtains the first light each time, the image sensor converts the first light into an image signal and transmits the image signal to the processor, the processor performs inverse Fourier transform on the obtained image signal based on the inverse Fourier transform function and outputs an image, and the diffraction condition of the first light is judged through the output image.
Based on the above embodiment, the original optical element is prepared by obtaining the structural parameters of the annular step structure after performing fourier transform on the light passing through the screen pixel layer by the processor, so that the plurality of annular step structures on the diffraction layer of the original optical element respectively correspond to light waves of different frequency bands in the fourier transform plane. After the original optical element is arranged in a Fourier transform plane, the processor receives an image signal acquired after passing through the original optical element, and then the image signal is processed through inverse Fourier transform corresponding to the Fourier transform to restore the image, so that image analysis is completed.
In some embodiments, a method of modifying an original optical element structure comprises: obtaining a random phase function, obtaining a structure depth parameter of the annular step structure by applying a random phase to the annular step structure and combining the random phase function, and correcting each annular step structure according to the structure depth parameter to obtain an optical element; the random phase function is as follows:
Φ＝2π/λ*(n-1)d
wherein Φ is a random phase; λ is the wavelength of light passing through the diffraction layer; n is the refractive index; d is the depth of the structure.
Based on the embodiment, a phase is applied to the diffractive optical element, and the structural depth of the corresponding annular step structure under different wavelengths of light can be directly obtained through the random limit function. The diffraction layer structure is modified by modifying the annular step structure on the diffraction layer to reduce diffraction of light passing through the diffractive optical element. When the diffraction light of different frequency bands passes through the step structures at the corresponding positions on the diffraction layer, the annular step structures can superpose the light of the same frequency band with the phase difference of 90 degrees to eliminate the phase difference, so that the light diffraction is reduced.
In some embodiments, the original optical element is a light barrier with a light-passing hole at the center, and the original optical element structure is modified by changing the aperture size of the light-passing hole to obtain the optical element.
Based on the above-mentioned embodiments, the operation is simple and easy to perform in a manner of reducing light diffraction by changing the optical element structure by changing the aperture of the light-passing hole on the light-blocking plate.
In a fourth aspect, an embodiment of the present application provides a method for manufacturing a camera module of an electronic device, including the following steps:
providing a first group of lenses, a second group of lenses, an image sensor and an optical element prepared according to the above method;
arranging a first group of lenses, a second group of lenses and an image sensor along the direction of an optical axis in sequence, and installing an optical element in a Fourier transform plane between the first group of lenses and the second group of lenses;
the image sensor acquires first image light of a target shooting object through the first group of lenses, the optical element and the second group of lenses and outputs a first signal, and the image sensor acquires second image light of the target shooting object through the screen, the first group of lenses, the optical element and the second group of lenses and outputs a second signal;
performing deconvolution filtering processing to compensate image blur according to the first signal and the second signal to obtain a deconvolution filtering function;
and storing the convolution filter function in a processor of the camera module.
According to the method for manufacturing the camera module of the electronic equipment, the two paths of light signals output by the image collector under the conditions of installation and non-installation of the optical element are combined to carry out deconvolution filtering processing to compensate image blurring, a deconvolution filtering function capable of compensating the image blurring is obtained, and the deconvolution filtering function can be directly applied to the camera module, so that the camera module capable of reducing light diffraction and compensating the image blurring is manufactured.
In a fifth aspect, embodiments of the present application provide an optical element produced according to the above-described method for producing an optical element.
Based on the optical element provided by the embodiment of the application, the light diffraction passing through the optical element can be effectively reduced.
The application provides a camera module, electronic equipment and a preparation method of the camera module, and diffraction of light rays passing through the camera module is reduced by arranging an optical element in a Fourier transform plane of two lenses. The image light after reducing diffraction is received by the image sensor and is converted into a first image signal through the image sensor, so that the first image signal is conveniently subjected to deconvolution filtering processing to further compensate blurring to obtain a second image signal, and the shooting module can reduce diffraction of the image light inside the shooting module.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic view of an assembly structure of a camera module according to an embodiment of the present disclosure;
fig. 2 is a schematic view of an assembly structure of a camera module according to another embodiment of the present disclosure;
FIG. 3 is a front view of a screen in an embodiment of the present application;
FIG. 4 is a front view of an optical element according to an embodiment of the present application;
FIG. 5 is a side view of an optical element in an embodiment of the present application;
FIG. 6 is a schematic view of an electronic device assembly according to an embodiment of the present disclosure;
FIG. 7 is a flow chart of a method for fabricating an optical element according to an embodiment of the present disclosure;
fig. 8 is a flowchart illustrating a method for manufacturing a camera module according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The inventors found that the related art in which an optical element is disposed under the screen eliminates diffraction of light, obtains poor imaging effect. Consequently, this application provides a module of making a video recording in order to reduce the light diffraction through the module of making a video recording better, improve the imaging quality of the module of making a video recording. The camera module in this application is applicable to various electronic device that have the function of making a video recording, for example electronic device can be cell-phone, panel computer, advertisement machine, entrance guard's device, on-vehicle camera, unmanned aerial vehicle etc..
Fig. 1 is a schematic structural diagram of a camera module 100 according to an embodiment of the present application. The camera module 100 includes a lens group including a first group lens 111 and a second group lens 112, an optical element 120, an image sensor 130, and a processor 150, the first group lens 111, the optical element 120, the second group lens 112, and the image sensor 130 are installed along an optical axis 140 direction of the camera module 100, so that external light can be received by the image sensor 130 after passing through the lenses and the optical element 120.
As shown in fig. 1 and 2, each group of lenses includes at least one lens, for example, the number of lenses in each group may be three, four, five, six, seven, eight, etc.
The optical element 120 is disposed in the fourier transform plane 180 between the two lenses. When the imaging module 100 is mounted, all the lenses in the first group of lenses and the second group of lenses and the optical element 120 are coaxially arranged around the optical axis 140 of the imaging module, so that light rays from the object side smoothly pass through the first group of lenses 111, the optical element 120 and the second group of lenses 112 in sequence and are projected onto the image sensor 130 on the imaging surface. The fourier transform plane 180 is perpendicular to the optical axis 140 of the camera module 100, and the distance between the fourier transform plane 180 and the second group lens 112 closest to the optical element 120 is equal to the effective focal length of the object side of the lens or the combined focal length of the second group lens, so as to ensure the imaging definition of the light projected onto the image sensor 130.
The optical element 120 is configured to reduce diffraction of light passing through the optical element, the image sensor 130 is disposed in an imaging plane of the camera module 100, the image sensor 130 receives the image light reduced in diffraction by the optical element 120 and converts the image light into a first image signal, and the first image signal is configured to perform deconvolution filtering processing to compensate for blur and obtain a second image signal. The light diffracted by the optical element 120 from the light passing through the screen 210, for example, a mobile phone screen 210 is taken as an example, as shown in fig. 3, a pixel unit periodically arranged in the transverse direction and the longitudinal direction is arranged on the mobile phone screen 210, a plurality of pixel units form a periodic pixel diffraction structure, the light passing through two adjacent pixel units of the screen 210 is diffracted, a light spot appears when the diffracted light is projected onto the image sensor 130 through a lens, and finally the imaging quality is reduced, and the optical element 120 arranged between the mobile phone screen 210 and the image sensor 130 can reduce the diffraction of the light passing through the inside thereof, thereby reducing the diffraction of the light passing through the mobile phone screen 210.
The optical element 120 is installed in the camera module 100, the light beam with reduced diffraction through the optical element 120 is projected to the image sensor 130, and the image sensor 130 converts the image light beam into a first image signal, and if the first image signal is directly processed, only a blurred image can be obtained. The camera module 100 further comprises a processor 150, and the processor 150 comprises a convolution filter, wherein the convolution filter is used for carrying out deconvolution filtering processing on the first image signal so as to compensate the blurring to obtain a second image signal. The first image signal obtained after the light diffraction is eliminated is further processed and blurred in compensation through the convolution filter, so that the problem of appearing blurring obtained after the light diffraction is reduced is solved, and the imaging quality of the camera module 100 is better.
Based on the camera module 100 provided in the embodiment of the present application, the diffraction of light passing through the camera module 100 is reduced by disposing the optical element 120 in the fourier transform plane 180 of the two lenses. The image light after the diffraction reduction is received by the image sensor 130 and is converted into a first image signal by the image sensor 130, so that the first image signal is subjected to deconvolution filtering processing to further compensate for blur to obtain a second image signal, and the camera module 100 can reduce the diffraction of the light passing through the camera module.
In some embodiments, the image capturing module 100 further includes an aperture stop 160, and the light passing aperture of the aperture stop 160 can effectively reduce stray light of the optical lens assembly to improve the image quality. The aperture stop 160 is disposed in the fourier transform plane 180 and the optical element 120 is mounted on the aperture stop 160. Specifically, the optical element 120 is installed corresponding to the light passing hole of the aperture stop 160. The inner diameter of the light-passing hole of the aperture stop 160 should be greater than or equal to the peripheral size of the optical element 120, and further, the aperture of the light-passing hole of the aperture stop 160 should be greater than or equal to the outer diameter of the area on the optical element 120 for the diffracted light to pass through, so as to prevent the edge of the aperture stop 160 from blocking the diffracted light to pass through, and influence the optical element 120 on reducing the light diffraction effect. The edge of the optical element 120, through which diffracted light rays pass, is not required to be an area for mounting on the aperture stop 160, facilitating the mounting of the optical element 120.
The diffracted light sequentially passes through the first group of lenses 111 and the second group of lenses 112 to be received by the image sensor 130, the diffracted light close to the center of the optical axis 140 of the camera module 100 is low-frequency-band light, and the diffracted light far away from the center of the optical axis 140 of the camera module 100 is high-frequency-band light. By mounting the optical element 120 in the fourier transform plane 180 of the first group of lenses 111 and the second group of lenses 112, diffraction of light rays in different areas of the fourier transform plane 180 can be correspondingly reduced by changing the structure of the optical element 120. The Optical element 120 is configured as an element that can eliminate light diffraction, for example, the Optical element 120 may be a Diffractive Optical Element (DOE) or a light barrier, etc.
When the optical element 120 is a light barrier, the optical element 120 may be a light barrier having a light passing hole in the center. The light passing hole is arranged by taking the optical axis 140 of the camera module 100 as a center, so that the light barrier can block the light far away from the optical axis 140 of the camera module 100 to pass through, and the light diffraction is reduced. The aperture of the light-transmitting hole in the center of the light barrier can be directly changed to change the light flux of the light barrier for blocking light to pass through, so that the effect of the light barrier on reducing light diffraction can be conveniently regulated and controlled, and the process of reducing light diffraction by changing the structure of the optical element 120 is easy to operate. The optical element 120 is mounted on the aperture stop 160, and in some embodiments, the light barrier may be integrally disposed with the aperture stop 160 such that the light barrier and the aperture stop 160 share a light transmitting hole, and the light flux passing through the interior thereof is changed and the diffraction of light rays is reduced by changing the aperture size of the central light transmitting hole of the integrally disposed light barrier and the aperture stop 160.
As shown in fig. 4 and 5, when the optical element 120 is a diffractive optical element, the optical element 120 includes a transparent substrate 121 and a diffractive layer 122 provided on the transparent substrate 121; the diffraction layer 122 includes a plurality of annular step structures 123 for reducing diffraction, the plurality of annular step structures are located in a plane parallel to the plate surface of the transparent substrate 121, and the plurality of annular step structures 121 are coaxially and integrally disposed with the optical axis 140 of the lens group as a central axis. When the diffracted light of different frequency bands passes through the step structures at the corresponding positions on the diffraction layer 122, the annular step structure 123 can superpose the light of the same frequency band with the phase difference of 90 degrees to eliminate the phase difference, so that the light diffraction is reduced, and the effect of eliminating the diffraction appears as weak light spots on the image sensor 130. The annular step structure 123 can be arranged to cover the penetration regions of the diffracted lights of multiple frequency bands, so that the manufactured optical element 120 can more comprehensively reduce the light diffraction of the multi-frequency band range (including the low-frequency band light close to the optical axis 140 of the camera and the high-frequency band light far away from the optical axis 140 of the camera). Basic parameters of the annular step structure 123 may include diameter, step radial width, step structure depth, step periodicity, and the like. Parameters such as the diameter, the step radial width, the step period number and the like of the corresponding annular step structure 123 can be determined according to the positions of the diffracted light rays of different frequency bands passing through the optical element 120, and then the corresponding structure depth of the annular step structure 123 is adjusted to change the structure of the diffraction layer 122 so as to reduce the light ray diffraction.
The optical element 120 is provided in the camera module 100, and the specification of the diffractive optical element needs to be controlled in consideration of the specification and size of the camera module 100. In some embodiments, the diameter of the annular step structure 123 located at the outermost periphery in a plane parallel to the plate surface of the transparent substrate 121 is greater than or equal to 1 mm and less than or equal to 3 mm, and the diameter error range of the annular step structure 123 is ± 1.5 micrometers; the thickness of the annular step structure 123 in a direction perpendicular to the plate surface of the transparent substrate 121 ranges from 1 micron or more to 800 microns or less. Under the specification range, the manufactured optical element 120 can be suitable for the camera module 100 with various specification requirements, and the processing of the optical element 120 is also convenient.
The transparent substrate 121 may be made of a material having a light-transmitting property, for example, the transparent substrate 121 may be a glass transparent substrate 121 or a plastic (e.g., PET) transparent substrate 121 to ensure light passing therethrough. The diffraction layer 122 is disposed on the transparent substrate 121, the light transmittance range of the annular step structure 123 of the diffraction layer 122 is 50% to 92%, and the annular step structure 123 in this transmittance range can satisfy the condition of reducing light diffraction.
In some embodiments, the diffraction layer 122 is a nano-transfer layer or a plating layer. When the optical element 120 is processed, the diffraction layer 122 may be disposed on the transparent substrate by nano-transfer printing or plating according to the obtained basic parameters of the annular step structure 123, so as to facilitate the processing of the annular step structure 123, and improve the correction efficiency of correcting the optical element 120 when the optical element 120 is required to be corrected.
An embodiment of the present application provides an electronic device 200, as shown in fig. 6, the electronic device 200 includes a screen 210 and the camera module 100 as described above. A pixel layer 220 is disposed on the screen 210. The camera is installed at a side of the screen 210 where the pixel layer 220 is located, and the camera module 100 is configured to receive the diffracted light passing through the pixel layer 220. The camera module 100 is installed under the screen 210, the camera module 100 receives the diffraction light passing through the pixel layer 220 of the screen 210, and the diffraction of the light passing through the pixel layer 220 of the screen 210 is reduced by the optical element 120 inside the camera module 100, so that the electronic device 200 installed with the camera module 100 has a good developing effect. The pixel layer 220 on the screen 210 is provided with a gap through which light passes, and light from the side of the screen 210 is diffracted after passing through the gap of the pixel layer 220. The pixel layer 220 may be an orderly arranged light-shielding matrix, and light passes through the gaps of the light-shielding matrix to generate diffraction; or the pixel layer 220 may also be a pixel unit arranged in a transverse direction or a longitudinal direction, and light passes through a gap between two adjacent pixel units to generate diffraction.
The object side light passes through the gap between the pixel layers 220 on the screen 210 for diffraction, the diffracted image light passes through the first group of lenses 111, the optical element 120 and the second group of lenses 112 and is received and converted into a first image signal by the image sensor 130, the first image signal is transmitted to the processor 150, the processor 150 converts the first image signal and transmits the first image signal to the convolution filter in the processor 150, and the convolution filter performs deconvolution filtering on the first image signal to compensate the image blur, and finally outputs an object side image with good imaging.
The embodiment of the present application provides a method for manufacturing an optical element 120 of an electronic device 200, as shown in fig. 7, including the following steps:
s101, providing an original optical element 120, a lens group and an image sensor 130, wherein the lens group comprises a first group of lenses 111 and a second group of lenses 112. The original optical element 120 is an element with an unmodified structure and capable of reducing light diffraction (the effect of reducing light diffraction is poor).
S102, disposing the first group lens 111, the second group lens 112, and the image sensor 130 in order along the direction of the optical axis 140, and disposing the original optical element 120 in the fourier transform plane 180 between the first group lens 111 and the second group lens 112. The number of lenses in each group of lenses may also include one, two, three, four, five, six, seven, eight, etc.
S103, the image sensor 130 collects the first light passing through the first group of lenses 111, the original optical element 120 and the second group of lenses 112. The first lens group 111, the original optical element 120, and the second lens group 112 may be disposed under the screen 210, and the first light may be light obtained by the image sensor 130 after passing through the pixel layer 220 of the screen 210, the first lens group 111, the original optical element 120, and the second lens group 112 in sequence.
S104, correcting the structure of the original optical element 120 according to the diffraction spot condition of the first light until the image sensor 130 obtains the first light without diffraction spots, namely, the optical element 120 capable of reducing diffraction is obtained.
According to the method for manufacturing the optical element 120 of the electronic device 200 provided by the embodiment of the present application, by placing the optical element 120 in the fourier transform plane 180, the original structure of the optical element 120 is modified according to the diffraction spot condition of the image light passing through the lens and the optical element 120, until the image sensor 130 obtains the image light without diffraction spots, that is, the optical element 120 with reduced diffraction is obtained.
In some embodiments, the original optical element 120 is a diffractive optical element, the diffractive optical element includes a transparent substrate 121 and a diffractive layer 122 disposed on the transparent substrate 121, and the diffractive layer 122 includes a plurality of annular step structures 123 for reducing diffraction. Before placing the original optical elements in the fourier transform plane 180 between the first group lens 111 and the second group lens 112 (before performing step S101), it may further include:
s201, providing a screen 210 and a processor 150, placing the first group of lenses 111, the second group of lenses 112 and the image sensor 130 under the screen, and connecting the image sensor 130 with the processor 150.
S202, providing incident light, making the incident light sequentially pass through the pixel layer 220, the first group of lenses 111, and the second group of lenses 112 on the screen 210, be received by the image sensor 130, converted into an image signal, and then transmitted to the processor 150, and the processor 150 analyzes the image signal to obtain the light intensity distribution and the fourier transform function of the incident light.
S203, the processor 150 performs fourier transform on the acquired image signal to obtain a fourier space distribution of the incident light based on the fourier transform function.
S204, obtaining the diffraction layer structure parameters of the original optical element 120 according to the Fourier space distribution and the light intensity distribution of the incident light, and preparing the original optical element 120 according to the diffraction layer structure parameters of the original optical element 120.
Based on the difference in the pattern distribution of the pixel layer 220 set on each screen 210 and the difference in the diffraction distribution of the light passing through the pixel layer 220, the steps from S201 to S204 may be repeated each time to obtain the fourier transform function and the diffraction layer corresponding to the pixel layer 220 on the screen 210 to prepare the corresponding original optical element 120.
Based on the above steps S201 to S204, after the original optical element 120 is placed in the fourier transform plane 180 between the first group lens 111 and the second group lens 112, i.e., step S104 may further include:
s301, the processor 150 obtains an inverse fourier transform function based on the fourier transform function.
Step S301 may also be executed directly after the fourier transform function is acquired in step S203, and the inverse fourier transform function acquired by the transform may be stored in the processor.
S302, after the image sensor 130 obtains the first light each time, the image sensor 130 converts the first light into an image signal and transmits the image signal to the processor 150, the processor 150 performs inverse fourier transform on the obtained image signal based on the inverse fourier transform function and outputs an image, and the diffraction condition of the first light is determined according to the output image.
The original optical element 120 is prepared by the processor 150 performing fourier transform on the light passing through the pixel layer 220 of the screen 210 to obtain the structural parameters of the annular step structures 123, so that the plurality of annular step structures 123 on the diffraction layer of the original optical element 120 respectively correspond to light waves of different frequency bands in the fourier transform plane 108. After the original optical element 120 is disposed in the fourier transform plane 180, the processor 150 receives the image signal obtained after passing through the original optical element 120, and then processes the image signal to restore the image through the inverse fourier transform corresponding to the fourier transform, so as to complete the image analysis, and determine whether the original optical element structure 120 needs to be corrected according to the analyzed spot condition of the image. The structural parameters of the annular step structure 123 obtained by fourier transform may include a diameter of the annular step structure 123, a step radial width, a step period number, and the like.
When the diffracted light rays in different frequency bands pass through the annular step structures 123 at corresponding positions on the diffraction layer 122, the annular step structures 123 can superpose the light rays in the same frequency band with the phase difference of 90 degrees to eliminate the phase difference, so that the light diffraction is reduced. The annular step structure 123 can be arranged to cover the penetration regions of the diffracted lights of multiple frequency bands, so that the manufactured optical element 120 can more comprehensively reduce the light diffraction of the multi-frequency band range (the low-frequency band light close to the optical axis 140 of the camera, and the high-frequency band light far away from the optical axis 140 of the camera). In some embodiments, a method of modifying an original optical element structure comprises: obtaining a random phase function, obtaining a structure depth parameter of each annular step structure 123 by applying a random phase to the diffraction layer 122 and combining the random phase function, and correcting the structure depth of each annular step structure 123 according to the structure depth parameter to obtain the optical element 120. The random phase function is as follows:
Φ＝2π/λ*(n-1)d
wherein Φ is a random phase; λ is the wavelength of light passing through the diffraction layer 122; n is the refractive index; d is the depth of the structure. That is, the longer the wavelength of the light passing through the current annular step structure 123, the deeper the structural depth of the current annular step structure 123. It can be understood that when the distribution of the diffracted light formed by the diffracted light passing through the optical element 120 is the same, the corresponding parameters such as the diameter of the step structure, the radial width of the step, the number of step cycles, etc. may be unchanged, and only the structural depth of the annular step structure 123 needs to be changed. When the distribution position of the diffracted light passing through the optical element 120 changes, for example, the distribution of the pixel layer 220 on the screen 210 is changed to change the distribution of the diffracted light passing through the pixel layer 220, the corresponding fourier transform function is obtained again to readjust the diameter, radial width of the step, number of step periods, etc. of the corresponding annular step structure 123 on the diffraction layer 122, and then the structure depth parameter corresponding to the annular step structure 123 is obtained through the random phase function, and the structure depth of the annular step structure 123 is adjusted to reduce the diffraction of the light.
In some embodiments, the original optical element 120 is a light barrier with a light-passing hole at the center, and the optical element 120 is obtained by changing the aperture size of the light-passing hole to modify the original optical element 120 structure, and the operation is simple and easy to perform.
The embodiment of the present application provides a method for manufacturing a camera module 100 of an electronic device 200, as shown in fig. 8, including the following steps:
s401, providing the first group lens 111, the second group lens 112, the image sensor 130, and the optical element 120 prepared according to the above method.
S402, the first group lens 111, the second group lens 112, and the image sensor 130 are sequentially disposed along the optical axis 140, and the optical element 120 is mounted in the fourier transform plane 180 between the first group lens 111 and the second group lens 112.
S403, the image sensor 130 obtains a first image light of the target object through the first group lens 111, the optical element 120 and the second group lens 112 and outputs a first signal, and the image sensor 130 obtains a second image light of the target object through the screen 210, the lens group and the optical element 120 and outputs a second signal.
S404, performing deconvolution filtering processing to compensate image blurring according to the first signal and the second signal to obtain a deconvolution filtering function.
S405, the convolution filter function is stored in the processor 150 of the camera module 100.
In the method for manufacturing the camera module 100 of the electronic device 200 according to the embodiment, the image blur is compensated by performing the deconvolution filtering processing on the two paths of light signals output by the image collector 130 when the optical element 120 is installed or not installed, so as to obtain the deconvolution filtering function capable of compensating the image blur, and the deconvolution filtering function can be directly applied to the camera module 100, thereby manufacturing the camera module 100 capable of reducing light diffraction and compensating the image blur.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present application, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of the description, but it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation and operate, and therefore the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the above terms can be understood according to the specific situation by those skilled in the art.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. The utility model provides a module of making a video recording which characterized in that includes:
a lens group including a first group of lenses and a second group of lenses, each group of lenses including at least one lens;
an optical element disposed in a Fourier transform plane between the first and second groups of lenses, the optical element for reducing diffraction of light passing therethrough;
the image sensor is arranged in an imaging surface of the camera module, receives image light with the diffraction reduced by the optical element and converts the image light into a first image signal; and
the processor comprises a convolution filter, wherein the convolution filter is used for carrying out deconvolution filtering processing on the first image signal so as to compensate blurring to obtain a second image signal;
the optical element is a diffractive optical element, and the diffractive optical element comprises a transparent substrate and a diffractive layer arranged on the transparent substrate; the diffraction image layer includes a plurality of annular step structures that are used for reducing the diffraction, and is a plurality of annular step structure is located and is on a parallel with in the plane of transparent substrate face, and is a plurality of annular step structure uses the optical axis of lens group is the center pin, coaxial and integrative setting.
2. The camera module of claim 1, further comprising an aperture stop disposed in the fourier transform plane, wherein the optical element is mounted to the aperture stop.
3. The camera module of claim 1, wherein the diameter of the annular step structure located at the outermost periphery in a plane parallel to the transparent substrate plate surface is in a range of 1 mm or more and 3 mm or less, and the diameter error of the annular step structure is ± 1.5 μm;
in the direction perpendicular to the transparent substrate plate surface, the thickness range of the annular step structure is greater than or equal to 1 micrometer and less than or equal to 800 micrometers.
4. The camera module of claim 1, wherein the annular step structure has a light transmittance in the range of 50% to 92%.
5. An electronic device, comprising:
a screen on which a pixel layer is provided; and
the camera module of any of claims 1-4, wherein the camera module is mounted on a side of the screen where the pixel layer is located, and the camera module is configured to receive diffracted light passing through the pixel layer.
6. A method for manufacturing an optical element of an electronic device, comprising the steps of:
providing an original optical element, a lens group and an image sensor, wherein the lens group comprises a first group of lenses and a second group of lenses;
arranging the first group of lenses, the second group of lenses and the image sensor in sequence along the direction of an optical axis, and placing the original optical element in a Fourier transform plane between the first group of lenses and the second group of lenses;
the image sensor collects first light rays passing through the first group of lenses, the original optical element and the second group of lenses;
correcting the original optical element structure according to the diffraction light spot condition of the first light until the image sensor obtains the first light without diffraction light spots, so as to obtain the optical element capable of reducing diffraction;
the optical element is a diffractive optical element, and the diffractive optical element comprises a transparent substrate and a diffractive layer arranged on the transparent substrate; the diffraction image layer includes a plurality of annular step structures that are used for reducing the diffraction, and is a plurality of annular step structure is located and is on a parallel with in the plane of transparent substrate face, and is a plurality of annular step structure uses the optical axis of lens group is the center pin, coaxial and integrative setting.
7. The method of making an optical element according to claim 6, wherein placing the original optical element in the Fourier transform plane between the first set of lenses and the second set of lenses further comprises:
providing a screen and a processor, placing the first set of lenses, the second set of lenses, and the image sensor under the screen, the image sensor being connected to the processor;
providing incident light rays, enabling the incident light rays to sequentially pass through a pixel layer, the first group of lenses and the second group of lenses on the screen, be received by the image sensor and converted into image signals, and transmitting the image signals to a processor, and analyzing the image signals by the processor to obtain the light intensity distribution and the Fourier transform function of the incident light rays;
based on the Fourier transform function, the processor performs Fourier transform on the acquired image signal to obtain Fourier spatial distribution of the incident light;
acquiring diffraction layer structure parameters of the original optical element according to Fourier space distribution and the light intensity distribution of the incident light, and preparing the original optical element according to the diffraction layer structure parameters of the original optical element;
positioning the primary optical element in a Fourier transform plane between the first and second sets of lenses further comprises:
the processor obtaining an inverse Fourier transform function based on the Fourier transform function;
after the image sensor obtains the first light each time, the image sensor converts the first light into an image signal and transmits the image signal to a processor, the processor performs inverse Fourier transform on the obtained image signal based on the inverse Fourier transform function and outputs an image, and the diffraction condition of the first light is judged through the output image.
8. The method of manufacturing an optical element according to claim 7, wherein the method of modifying the original optical element structure comprises: obtaining a random phase function, obtaining a structure depth parameter of the annular step structure by applying a random phase to the annular step structure and combining the random phase function, and correcting each annular step structure according to the structure depth parameter to obtain the optical element;
the random phase function is as follows:
Φ＝2π/λ*(n-1)d
wherein Φ is a random phase; λ is the wavelength of light passing through the diffraction layer; n is the refractive index; d is the depth of the structure.
9. A preparation method of a camera module of electronic equipment is characterized by comprising the following steps:
providing a first set of lenses, a second set of lenses, an image sensor and an optical element prepared according to the method of any of the preceding claims 7-8;
arranging the first group lens, the second group lens and the image sensor in the optical axis direction in sequence, and installing the optical element in a Fourier transformation plane between the first group lens and the second group lens;
the image sensor acquires first image light of a target shooting object through the first group of lenses, the optical element and the second group of lenses and outputs a first signal, and the image sensor acquires second image light of the target shooting object through the screen, the first group of lenses, the optical element and the second group of lenses and outputs a second signal;
carrying out deconvolution filtering processing to compensate image blurring according to the first signal and the second signal to obtain a deconvolution filtering function;
and storing the deconvolution filter function in a processor of the camera module.
10. An optical element produced by the method for producing an optical element according to any one of claims 7 to 8.
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| US11721001B2 (en) | 2021-02-16 | 2023-08-08 | Samsung Electronics Co., Ltd. | Multiple point spread function based image reconstruction for a camera behind a display |
| US11722796B2 (en) | 2021-02-26 | 2023-08-08 | Samsung Electronics Co., Ltd. | Self-regularizing inverse filter for image deblurring |
| US20230119549A1 (en) * | 2021-10-14 | 2023-04-20 | Samsung Electronics Co., Ltd. | Optical Element for Deconvolution |
| CN114302046A (en) * | 2021-12-31 | 2022-04-08 | 浙江全视通科技有限公司 | Camera device applied under screen |
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