CN113671606A

CN113671606A - Super lens, camera module and electronic equipment that constitute

Info

Publication number: CN113671606A
Application number: CN202110882863.6A
Authority: CN
Inventors: 潘望军; 魏源
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2021-08-02
Filing date: 2021-08-02
Publication date: 2021-11-19
Also published as: WO2023011365A1

Abstract

The application discloses super lens, module and electronic equipment of making a video recording belongs to imaging device technical field. The camera module comprises a substrate and a plurality of light modulation columns, wherein the substrate comprises a mounting surface, the light modulation columns are distributed on the mounting surface in an array manner, through holes are formed in the light modulation columns, and the through holes penetrate through the light modulation columns along the axial direction of the light modulation columns; the light adjusting columns are of a symmetrical structure. The scheme can solve the problems of chromatic dispersion and spherical aberration of the micro lens under the condition of being used for imaging.

Description

Super lens, camera module and electronic equipment that constitute

Technical Field

The application belongs to the technical field of imaging equipment, concretely relates to super lens, camera module and electronic equipment.

Background

Microlenses are widely used in various optical instruments as a common optical element. In imaging instruments, in order to better capture light rays in a scene, a micro lens is used to change the optical path.

In the process of manufacturing the micro lens, a material for manufacturing the micro lens is heated to a partially liquefied state, and an original plane is molded into a curved surface by utilizing the surface tension of a liquefied part, so that the precision of the curvature radius of the micro lens is influenced by a processing technology, and the micro lens has chromatic dispersion and spherical aberration in the imaging process, and the imaging quality is influenced.

Disclosure of Invention

The purpose of the embodiment of this application is to provide a super lens and module of making a video recording, can solve the microlens and have the problem of chromatic dispersion and spherical aberration under the condition that is used for formation of image.

In order to solve the technical problem, the present application is implemented as follows:

the embodiment of the application discloses a super-structure lens, which comprises a substrate and a plurality of light modulation columns, wherein the substrate comprises a mounting surface, the light modulation columns are distributed on the mounting surface in an array manner, through holes are formed in the light modulation columns, and the through holes penetrate through the light modulation columns along the axial direction of the light modulation columns; the light adjusting columns are of a symmetrical structure.

Based on the disclosed super lens of this application embodiment, this application still discloses a module of making a video recording. This module of making a video recording includes sensitization chip and the super lens of structuring that this application embodiment disclosed. The super-structure lens is opposite to the photosensitive chip, and light penetrates through the super-structure lens and irradiates the photosensitive chip.

The technical scheme adopted by the invention can achieve the following beneficial effects:

the super-structure lens disclosed by the embodiment of the invention comprises a plurality of light modulation columns, wherein the plurality of light modulation columns are distributed on a substrate in an array mode, and the shape or the size of the light modulation columns can be further set according to requirements so as to adjust the performance of the super-structure lens for modulating the light wave phase. The light modulation column is of a symmetrical structure, so that the light modulation column has consistent effects on different incident lights, and further, the purposes of eliminating chromatic dispersion and spherical aberration can be achieved.

Drawings

FIG. 1 is a schematic view of a light modulating column at a first viewing angle according to one embodiment of the present invention;

FIG. 2 is a schematic diagram of a first plane of symmetry and a second plane of symmetry of a light modulating column according to one embodiment of the present invention;

FIG. 3 is a schematic diagram of a light modulating column at a second viewing angle according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view of a light modulating column according to one embodiment of the present disclosure;

FIG. 5 is a perspective view of a disclosed superlens according to one embodiment of the present invention;

FIG. 6 is a top view of a disclosed superlens according to one embodiment of the present invention;

FIG. 7 is a schematic illustration of a plurality of super structured lens arrays as disclosed in one embodiment of the present invention;

FIG. 8 is a top view of a plurality of super structured lens arrays as disclosed in one embodiment of the present invention;

fig. 9 is a schematic view of a camera module according to a first embodiment of the present invention;

FIG. 10 is a magnified schematic view of a single superlens of FIG. 8;

fig. 11 is a schematic view of a camera module according to a second embodiment of the present invention;

fig. 12 is a schematic view of a camera module according to a third embodiment of the present invention;

FIG. 13 is a graph of the height and width of a light modulating column as a function of optical phase value and angular dispersion ratio according to a first embodiment of the present invention;

FIG. 14 is a graph of height and width of a beam of light modulating columns as a function of phase value and angular dispersion ratio according to a second embodiment of the present invention;

FIG. 15 is a graph of distance from the center of the beam splitter and phase values versus angular dispersion ratio for a super-structured lens in accordance with an embodiment of the present invention.

In the figure: 100-a super-structured lens; 110-a substrate; 111-a mounting surface; 120-a light modulating column; 121-a through hole; 122 — first plane of symmetry; 123-a second plane of symmetry; 130-a third plane of symmetry; 140-a fourth plane of symmetry; 200-a photosensitive chip; 300-an infrared filter; 400-main lens; 500-cover plate; 600-first phase plane.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of 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.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.

The meta lens (lenses) provided in the embodiments of the present application is described in detail with reference to fig. 1 to fig. 15 through specific embodiments and application scenarios thereof.

Referring to fig. 1 to 6, a super lens 100 according to an embodiment of the present invention includes a substrate 110 and a plurality of light modulation columns 120. The base 110 is a basic structure, and can provide an installation base for the light modulation columns 120 and support for the plurality of light modulation columns 120. Specifically, the substrate 110 includes a mounting surface 111, and the plurality of light modulation columns 120 are distributed on the mounting surface 111 in an array.

The light adjusting column 120 is provided with a through hole 121, and the through hole 121 penetrates through the light adjusting column 120 along the axial direction of the light adjusting column 120. The light-adjusting column 120 has a symmetrical structure, so that the light-adjusting column 120 has the same effect on different incident lights, and the purposes of eliminating chromatic dispersion and spherical aberration can be achieved.

In the above embodiment, the plurality of light modulation columns 120 are distributed on the substrate 110 in an array, and further, the shape or size of the light modulation columns 120 can be set as required to adjust the performance of the super-structured lens 100 for modulating the optical wave phase. The through hole 121 is formed in the light adjusting column 120, so that the through hole 121 penetrates through the light adjusting column 120 along the axial direction of the light adjusting column 120, the shapes of the light adjusting columns 120 in the super-structure lens 100 can be single, and the performance of modulating the phase of the light wave of the super-structure lens 100 can be adjusted only by setting the height and the width of each light adjusting column 120 and the distance between the light adjusting columns 120. The above structure can reduce the difficulty in manufacturing the super lens 100. In addition, the light modulation columns 120 in the super-structure lens 100 can be formed by etching or stamping, so that the height and the width of the light modulation columns 120 and the space between the light modulation columns 120 can be controlled, that is, the light modulation columns 120 with the required size can be manufactured as required. Note that, the width of the light control column 120 is: the width of the light pillar 120 in a direction perpendicular to the axis of the light pillar 120. The length of the light control pillar 120 refers to the length in the direction perpendicular to the axis of the light control pillar 120. Wherein, the width of the direction perpendicular to the axis of the light adjusting column 120 is less than or equal to the length of the direction perpendicular to the axis of the light adjusting column 120. The height of the light-adjusting column 120 refers to: the dimension of the light control column 120 in the axial direction of the light control column 120.

In an alternative embodiment, the height range of the light adjusting column 120 may be: 100nm-2 um. The width of the light adjusting column 120 may be 10nm at the minimum. The maximum width of the light-adjusting columns 120 is related to the distance between two adjacent light-adjusting columns 120, and for this reason, the maximum width of the light-adjusting columns 120 is not limited in this embodiment. Alternatively, the distance between two adjacent dimming columns 120 may be in the range of 50nm to 300 nm. Of course, the distance between two adjacent light modulation columns 120 may be equal to reduce the difficulty of manufacturing the super lens 100.

Fig. 13 and 14 are graphs showing the relationship between the height and width of the light-adjusting column 120 and the phase modulation performance of the light-adjusting column 120 on the light wave according to the present invention. Specifically, each line represents the relationship between the width of the light control column 120 and the phase value or the angular dispersion ratio when the height of the light control column 120 is constant. The height range of the light-adjusting column 120 in fig. 13 is 400nm to 500nm, and the height range of the light-adjusting column 120 in fig. 14 is 300nm to 400 nm. This makes it possible to obtain that, when the height of the light control column 120 is constant, the larger the width of the light control column 120 is, the larger the corresponding phase value and angular dispersion ratio are. When the width of the light control column 120 is constant, the phase value and the angular dispersion ratio corresponding to the light control column 120 increase as the height of the light control column 120 increases. FIG. 15 is a diagram showing the relationship between the phase value and angular dispersion ratio of the light-adjusting columns 120 at different positions in the super-structured lens 100 under the condition that the pixel size is 1.12um, the focal length of the super-structured lens 100 is 0.8um-2um, and the wavelength bandwidth is 420-650 nm. Specifically, for convenience of description, the distance from the light modulation column 120 to the central portion of the super-structured lens 100 is defined as a first distance, the abscissa in fig. 15 represents the distance from the light modulation column 120 to the central portion of the super-structured lens 100, and the ordinate represents the phase value or the angular dispersion ratio. Therefore, the height and width of each light modulation pillar 120 in the super lens 100 can be calculated according to fig. 13 to 15, and then the corresponding super lens 100 is manufactured by etching or stamping.

Optionally, the light pillar 120 has at least one plane of symmetry, and the light pillar 120 is symmetrical with respect to the plane of symmetry. Further, the light control column 120 has at least one symmetry plane perpendicular to the mounting surface 111. Further, the light adjusting post 120 may be vertically disposed with respect to the mounting surface 111 to facilitate the fabrication of the light adjusting post 120.

Referring to fig. 3, the column 120 has a first symmetry plane 122 and a second symmetry plane 123, the first symmetry plane 122 being perpendicular to the second symmetry plane 123 to facilitate the manufacture of the column 120. Optionally, the light modulation column 120 is a regular quadrangular prism, that is, the width and the length of the light modulation column 120 in the direction perpendicular to the axis of the light modulation column 120 are equal, so that the size number of the light modulation column 120 can be reduced, and the calculation amount in the design and manufacturing process can be reduced, thereby facilitating the manufacturing. Further, the through hole 121 may be provided as a cylindrical through hole to improve the performance of the super lens 100 in removing chromatic aberration and spherical aberration.

Referring to fig. 5 to 8, the plurality of light modulation columns 120 are arranged in a row along a first direction and a second direction, the first direction is perpendicular to the second direction, a first symmetric surface 122 corresponding to each light modulation column 120 is parallel to the first direction, and a second symmetric surface 123 corresponding to each light modulation column 120 is parallel to the second direction, so as to arrange each light modulation column 120, and improve the symmetry of the super-structure lens 100, thereby improving the performance of the super-structure lens 100 in eliminating chromatic aberration and spherical aberration. Optionally, the light modulating pillars 120 are uniformly arranged along the first direction; the light-adjusting columns 120 are uniformly arranged along the second direction. Further, optionally, the distance between two adjacent dimming columns 120 arranged in a row along the first direction is a first distance; the distance between two adjacent dimming columns 120 arranged in a row along the second direction is the second distance, the first distance can be equal to the second distance, the symmetry of the super-structure lens 100 can be improved, the performance of eliminating chromatic aberration and spherical aberration of the super-structure lens 100 can be improved, and the manufacturing difficulty of the super-structure lens 100 can be reduced. Further, among the plurality of light modulation columns 120, the light modulation columns 120 having the same pitch as the center of the super lens 100 have the same size. Specifically, the light-adjusting columns 120 are equal in size, which means that the light-adjusting columns 120 are equal in height and width and the diameter of the through hole 121. The center of the super lens 100 may be the optical axis of the super lens 100.

In general, the imaging of the camera module is mainly visible light imaging. In an alternative embodiment, the dimension of the light-adjusting column 120 perpendicular to the axial direction is smaller than the wavelength of violet light, that is, the dimension of the light-adjusting column 120 perpendicular to the axial direction is smaller than the wavelength of visible light, that is, the dimension of the light-adjusting column 120 perpendicular to the axial direction belongs to the sub-wavelength range, so as to prevent the reflected light from diffracting light to form a "ghost image", thereby achieving the purpose of eliminating the "ghost image".

Optionally, projections of the plurality of light-adjusting columns 120 in the axial direction of the light-adjusting columns 120 are symmetrical about a third symmetrical plane 130 and a fourth symmetrical plane 140, the third symmetrical plane 130 is parallel to the first symmetrical plane 122 corresponding to each light-adjusting column 120, the fourth symmetrical plane 140 is parallel to the second symmetrical plane 123 corresponding to each light-adjusting column 120, and the third symmetrical plane 130 and the fourth symmetrical plane 140 intersect at the center of the super-structure lens 100, so that the symmetry of the super-structure lens 100 is further improved, and the performances of the super-structure lens 100 in eliminating chromatic aberration and spherical aberration are improved. The intersection of the third symmetry plane 130 and the fourth symmetry plane 140 at the center of the super lens 100 means that the intersection of the third symmetry plane 130 and the fourth symmetry plane 140 passes through the center of the super lens 100.

Optionally, the light modulating column 120 described herein is generally an optical medium material. There are many types of optical media materials, such as: GaN, TiO2, SiN, Si, etc. Therefore, the specific material of the light adjusting column 120 is not limited in this embodiment.

Based on the disclosed super lens 100 of this application embodiment, this application still discloses a module of making a video recording. The camera module comprises the super-structure lens 100 in any embodiment of the application, so that chromatic aberration and spherical aberration are eliminated by the super-structure lens 100, and the imaging quality of the camera module is improved. Optionally, the camera module still includes sensitization chip 200, and super lens 100 sets up with sensitization chip 200 relatively, and the light that sees through super lens 100 can shine in sensitization chip 200, and then can promote sensitization chip 200 imaging quality, avoids the camera module to form "ghost image" at the in-process of shooing, reaches the purpose of eliminating "ghost image".

Referring to fig. 9 to 11, the photosensitive chip 200 includes a plurality of pixel units. The number of the super-structure lenses 100 is multiple, the super-structure lenses 100 correspond to the pixel units one by one, the super-structure lenses 100 are arranged opposite to the pixel units, and light passes through the super-structure lenses 100 and is projected onto the photosensitive chip 200, so that the light passing through the super-structure lenses 100 can be imaged through the photosensitive chip 200. It should be noted that the one-to-one correspondence between the super-structure lens 100 and the pixel units in the photosensitive chip 200 refers to: the light passing through the super-structure lens 100 is projected onto the corresponding pixel unit of the photo sensor chip 200.

In the above embodiment, the super-structure lenses 100 correspond to the pixel units in the photosensitive chip 200 one to one, and the plurality of super-structure lenses 100 form a super-structure lens array, so that light field capture can be realized, three-dimensional imaging can be achieved, depth of field information can be directly obtained, and imaging quality of the camera module is improved. Because can obtain darker depth of field scope, and then can make the macro shoot formation of image more clear to, under the condition that the module of making a video recording includes main camera lens 400, can also reduce the stroke that drives main camera lens 400 focusing motion, reduce the height of the module of making a video recording.

In an optional embodiment, the camera module further includes an infrared filter 300, and the super-structure lens 100 is disposed on the infrared filter 300. The infrared filter 300 can filter out a part of stray light, so that the stray light can be reduced from affecting the imaging of the photosensitive chip 200, and the imaging quality of the photosensitive chip 200 is ensured.

In an alternative embodiment, the substrate 110 is fixedly attached to a side of the infrared filter 300 close to the photosensitive chip 200. Further, the infrared filter 300 is an infrared cut film disposed on a side of the substrate 110 away from the dimming post 120.

In the above embodiment, the function of the infrared cut film may be integrated on the basis of the array formed by the super lens 100, which is further beneficial to reducing the height of the camera module. The height of the camera module refers to the dimension of the camera module in the viewing direction, wherein the viewing direction refers to the axial direction of the light inlet channel of the camera module.

Referring to fig. 11, in an alternative embodiment, the image capturing module further includes a main lens 400, the main lens 400 is disposed opposite to a photosensitive surface of the photosensitive chip 200, the super-lens 100 is disposed between the main lens 400 and the photosensitive chip 200, a phase plane of an image formed by the main lens 400 is a first phase plane 600, and the super-lens 100 is disposed between the main lens 400 and the first phase plane 600. Light rays entering through the main lens 400 are imaged again through the array formed by the super-structured lens 100, and light field capture can be achieved. The super-structure lens 100 is located between the main lens 400 and the first phase plane 600, and can translate the actual imaging surface of the camera module towards the direction close to the main lens 400, so as to reduce the height of the camera module, and further facilitate the reduction of the thickness of the electronic device.

The phase plane imaged by the main lens 400 is a phase plane where light passes through the main lens 400 and is imaged. Specifically, the phase plane imaged by the main lens 400 may be the focal plane of the main lens 400. Therefore, the position of the first phase plane 600 with respect to the main lens 400 is related to the optical performance of the main lens 400. In the above embodiment, the super-structure lens 100 is located between the main lens 400 and the first phase surface 600, so that the super-structure lens 100 can capture a light field before the light reaches the first phase surface 600.

For convenience of explanation, the actual imaging surface of the camera module is the second image surface. Referring to fig. 11, a distance between the second image plane and the super-structure lenses 100 is b, and a focal length corresponding to each super-structure lens 100 is f; the distance between the first image plane and the super-structured lens 100 is a; then

From this can directly obtain, the height that the module of making a video recording reduced is:

further, the height and/or width of the light adjusting column 120 can be changed, so that the super-structured lens 100 can correct the spherical aberration and chromatic aberration of the main lens 400, and the imaging quality of the camera module is further improved.

In another optional embodiment, the image capturing module further includes a main lens 400, the main lens 400 is disposed opposite to a photosensitive surface of the photosensitive chip 200, the super-structure lens 100 is disposed between the main lens 400 and the photosensitive chip 200, a phase plane of an image formed by the main lens 400 is a first phase plane 600, and the first phase plane 600 is located between the main lens 400 and the super-structure lens 100. Further, the height and/or width of the light adjusting column 120 can be changed, so that the super-structured lens 100 can correct the spherical aberration and chromatic aberration of the main lens 400, and the imaging quality of the camera module is further improved.

In an alternative embodiment, the camera module further includes a cover plate 500, and the cover plate 500 is located at an end of the main lens 400 where light enters to protect the main lens 400. Alternatively, the cover plate 500 may be made of a light-transmitting material. The transparent material may be a resin material or glass, and the specific material of the cover 500 is not limited in this embodiment.

Based on the camera module disclosed by the invention, the embodiment of the invention discloses electronic equipment, which comprises the camera module disclosed by the embodiment.

The electronic device disclosed in the embodiment of the application can be a mobile phone, a tablet computer, an electronic book reader, a medical apparatus and the like, and the embodiment of the application does not limit the specific type of the electronic device.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Further, it should be noted that the scope of the methods and apparatus of the embodiments of the present application is not limited to performing the functions in the order illustrated or discussed, but may include performing the functions in a substantially simultaneous manner or in a reverse order based on the functions involved, e.g., the methods described may be performed in an order different than that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A super-structured lens is characterized by comprising a substrate (110) and a plurality of light modulation columns (120), wherein the substrate (110) comprises a mounting surface (111), the light modulation columns (120) are distributed on the mounting surface (111) in an array manner, through holes (121) are formed in the light modulation columns (120), and the through holes (121) penetrate through the light modulation columns (120) along the axial direction of the light modulation columns (120); the light adjusting columns (120) are of symmetrical structures.

2. The super lens according to claim 1, wherein the light modulating column (120) has a first symmetry plane (122) and a second symmetry plane (123), the first symmetry plane (122) being perpendicular to the second symmetry plane (123).

3. The super lens according to claim 2, wherein the light modulating column (120) is a regular quadrangular prism and the through hole (121) is a cylindrical through hole.

4. The super lens according to claim 2, wherein the plurality of light modulation columns (120) are arranged in a column along a first direction and a second direction, the first direction is perpendicular to the second direction, the first symmetrical surface (122) corresponding to each light modulation column (120) is parallel to the first direction, and the second symmetrical surface (123) corresponding to each light modulation column (120) is parallel to the second direction.

5. The super lens according to any of claims 2 to 4, wherein the light modulating columns (120) of the plurality of light modulating columns (120) that are equally spaced from the center of the super lens are equally sized.

6. The super structured lens according to claim 5, wherein the dimension of the light modulating column (120) in the direction perpendicular to the axis is smaller than the wavelength of visible light.

7. The super lens according to claim 5, wherein the projections of the plurality of light modulation columns (120) in the axial direction of the light modulation columns (120) are symmetrical about a third symmetry plane (130) and a fourth symmetry plane (140), the third symmetry plane (130) is parallel to the first symmetry plane (122) corresponding to each light modulation column (120), the fourth symmetry plane (140) is parallel to the second symmetry plane (123) corresponding to each light modulation column (120), and the third symmetry plane (130) and the fourth symmetry plane (140) intersect at the center of the super lens (100).

8. A camera module, comprising a photosensitive chip (200) and the super lens (100) of any one of claims 1 to 7, wherein the super lens (100) is disposed opposite to the photosensitive chip (200), and the light passing through the super lens (100) can irradiate the photosensitive chip (200).

9. The camera module according to claim 8, characterized in that it further comprises an infrared filter (300), said super lens (100) being arranged on said infrared filter (300).

10. The camera module according to claim 9, wherein the substrate (110) is fixedly attached to a side of the infrared filter (300) close to the photosensitive chip (200).

11. The camera module according to claim 10, wherein the infrared filter (300) is an infrared cut-off film disposed on a side of the substrate (110) away from the light-adjusting column (120).

12. The camera module according to claim 8, characterized in that the photosensitive chip (200) comprises a plurality of pixel units; the number of the super-structure lenses (100) is multiple, and the super-structure lenses (100) correspond to the pixel units one by one.

13. The camera module according to claim 12, further comprising a main lens (400), wherein the main lens (400) is disposed opposite to a photosensitive surface of the photosensitive chip (200), the super lens (100) is disposed between the main lens (400) and the photosensitive chip (200), a phase surface imaged by the main lens (400) is a first phase surface (600), and the super lens (100) is disposed between the main lens (400) and the first phase surface (600).

14. The camera module according to claim 12, further comprising a main lens (400), wherein the main lens (400) is disposed opposite to a photosensitive surface of the photosensitive chip (200), the super-structure lens (100) is disposed between the main lens (400) and the photosensitive chip (200), a phase plane imaged by the main lens (400) is a first phase plane (600), and the first phase plane (600) is located between the main lens (400) and the super-structure lens (100).

15. An electronic device comprising the camera module of any one of claims 8-14.