CN111427105B - Fish-eye lens - Google Patents
Fish-eye lens Download PDFInfo
- Publication number
- CN111427105B CN111427105B CN202010539738.0A CN202010539738A CN111427105B CN 111427105 B CN111427105 B CN 111427105B CN 202010539738 A CN202010539738 A CN 202010539738A CN 111427105 B CN111427105 B CN 111427105B
- Authority
- CN
- China
- Prior art keywords
- columnar
- columnar structure
- lens
- cylindrical
- cross
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The embodiment of the application provides a fisheye lens, which comprises a lens body, wherein a plurality of cylindrical structures are respectively arranged on two surfaces of the lens body, each cylindrical structure in each surface forms at least one cylindrical structure area, the distance between each point in the ith cylindrical structure area and a preset position is within the ith distance range, the preset position is a position in the surface, and i is an integer greater than or equal to 1; in each columnar structure region, the size of the cross section of the columnar structure is sequentially decreased along the direction away from the preset position. The thickness and the weight of fisheye lens can be reduced, and the user experience is improved.
Description
Technical Field
The application relates to the field of micro-nano optical imaging, in particular to a fisheye lens.
Background
Currently, most terminal devices (mobile phones, computers, etc.) have a shooting function, and a user can shoot pictures or view screens according to a camera device on the terminal device.
In the prior art, the camera of the terminal equipment is usually composed of a fish-eye lens, which is a lens with an ultra-large viewing angle (generally more than 120 °) and is composed of a plurality of spherical lenses. According to the material and the thickness of the spherical lens, the phases corresponding to light propagation at different positions are accumulated differently, so that the light propagation direction is controlled, and light is focused and imaged. However, the fisheye lens determined by the method has excessive weight, thickness and volume, and when the fisheye lens is applied to an actual product, the fisheye lens has excessive volume and weight, is inconvenient to carry and use, and reduces the user experience.
Disclosure of Invention
The application provides a fisheye lens has reduced fisheye lens's thickness, in using to the actual product, can reduce the volume of product, has improved user's experience.
The embodiment of the application provides a fish-eye lens, which comprises a lens main body, wherein a plurality of cylindrical structures are respectively arranged on two surfaces of the lens main body, wherein,
in each surface, the plurality of columnar structures form at least one columnar structure region, the distance between each point in the ith columnar structure region and a preset position is within the ith distance range, the preset position is a position in the surface, and i is an integer greater than or equal to 1;
in each columnar structure region, the size of the cross section of the columnar structure is sequentially decreased along the direction away from the preset position.
In one possible embodiment, the 1 st columnar structure region is a circular region with the preset position as an origin.
In a possible embodiment, the number of the at least one columnar structure region is greater than or equal to 2, and when i is greater than or equal to 2, the ith columnar structure region is an annular region.
In a possible embodiment, in each surface, the plurality of cylindrical structures is distributed in the form of a grid.
In a possible embodiment, the preset position is a central position of the surface.
In one possible embodiment, the two surfaces are each circular in shape.
In a possible embodiment, the two surfaces comprise a first surface and a second surface, the radius of the first surface being smaller than the radius of the second surface.
In a possible embodiment, the cylindrical structure is a cylinder, and the size of the cross-section is a radius of the cylinder.
In one possible embodiment, the cylindrical structure is a square cylinder, and the dimension of the cross section is the side length of the cross section of the square cylinder.
In one possible embodiment, the lens body is a superlens.
In a possible embodiment, the material of the columnar structure is any one of the following materials: silicon dioxide, polysilicon, amorphous silicon, aluminum oxide, gallium nitride, silicon nitride and titanium dioxide.
The embodiment of the application provides a fisheye lens, which comprises a lens main body, wherein a plurality of cylindrical structures are respectively arranged on two surfaces of the lens main body, at least one cylindrical structure area is formed in each surface by the plurality of cylindrical structures, the distance between each point in the ith cylindrical structure area and a preset position is within the ith distance range, the preset position is a position in the surface, and i is an integer greater than or equal to 1; in every cylindricality structure region, along keeping away from the direction of predetermineeing the position, the size of the cross section of cylindricality structure diminishes in proper order, like this, can realize the control of the direction of light propagation for the light focuses formation of image, and then has reduced the thickness of fisheye lens, in using actual product, can reduce the volume of product, has improved user's experience.
Drawings
Fig. 1A is a cross-sectional view of a fish-eye lens structure provided in an embodiment of the present application;
fig. 1B is a top view of a fish-eye lens structure according to an embodiment of the present disclosure;
fig. 2 is a schematic view of an operating principle of a fisheye lens provided in an embodiment of the present application;
FIG. 3 is a schematic diagram of a cylindrical structure region of a fish-eye lens according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a cylindrical structure region of another fish-eye lens provided in an embodiment of the present application;
fig. 5 is a schematic diagram of a cylindrical structure according to an embodiment of the present disclosure;
fig. 6 is a schematic diagram of a square column structure provided in the embodiment of the present application;
FIG. 7 is a schematic structural diagram of a lens body according to an embodiment of the present disclosure;
FIG. 8 is a schematic diagram of electromagnetic field simulation of a cross section of a pillar structure according to an embodiment of the present application;
FIG. 9 is a schematic diagram of the variation of the phase and effective transmittance of the emergent electromagnetic wave with the radius of the cylindrical structure according to the embodiment of the present application;
fig. 10 is a schematic structural diagram of an imaging system according to an embodiment of the present application.
Reference numerals:
11: a lens body;
12: a columnar structure;
14: a columnar structure region;
15: presetting a position;
21: a first surface;
22: a second surface;
23: a focusing plane;
24: light rays;
31: a first columnar structure region;
32: a second columnar structure region;
33: a cylindrical columnar structure;
34: a square column structure;
35: a grid;
41: polarization intensity of electric field:
42: a curve;
43: a curve;
51: pipe sleeve;
52: a standardized small ccd image sensor;
53: a fish eye lens.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.
Although relative terms, such as "upper" and "lower," may be used in this specification to describe one element of an icon relative to another, these terms are used in this specification for convenience only, e.g., in accordance with the orientation of the examples described in the figures. It will be appreciated that if the device of the icon were turned upside down, the element described as "upper" would become the element "lower". When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.
The terms "a," "an," "the," and "said" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc. The terms "first" and "second" are used merely as labels, and are not limiting on the number of their objects.
The technical means shown in the present application will be described in detail below with reference to specific examples. It should be noted that the following embodiments may be combined with each other, and the description of the same or similar contents in different embodiments is not repeated.
For convenience of understanding, the structure of the fisheye lens in the embodiment of the present application is described in detail with reference to fig. 1A to 1B.
Fig. 1A is a cross-sectional view of a fish-eye lens structure according to an embodiment of the present disclosure. Referring to fig. 1A, the lens assembly includes a lens body 11, and a plurality of cylindrical structures 12 are respectively disposed on two surfaces of the lens body 11. Wherein the lens body 11 comprises a first surface 21 and a second surface 22, and the columnar structure 12 is disposed on the first surface 21 and the second surface 22. In each surface, the plurality of columnar structures 12 form at least one columnar structure region, for example, as shown in fig. 1A, on a first surface 21 of the lens body, the plurality of columnar structures form columnar structure regions 1 and columnar structure regions 2, and on a second surface 22 of the lens body, the plurality of columnar structures form columnar structure regions 1, columnar structure regions 2, and columnar structure regions 3. The distance between each point in the ith cylindrical structure region and a preset position is within the ith distance range, the preset position is a position in the surface, and i is an integer greater than or equal to 1; in each columnar structure region, the size of the cross section of the columnar structure 12 is sequentially decreased in the direction away from the preset position.
Alternatively, the first surface 21 and the second surface 22 are circular in shape. Wherein the radius of the first surface 21 is smaller than the radius of the second surface 22. For example, the radius of the second surface 22 may be 1.5 times the radius of the first surface 21. Alternatively, the shape of the first surface 21 and the second surface 22 may be an ellipse, a rectangle, or an irregular figure. Alternatively, the shape of the first surface 21 and the second surface 22 may be different. For example, the first surface 21 may be circular in shape and the second surface 22 may be elliptical in shape.
Optionally, the lens body 11 is a super lens, wherein the lens body 11 may be a planar super lens or a curved super lens. The material of the lens body 11 may include silicon dioxide, aluminum oxide, or the like.
Alternatively, the columnar structure 12 may include a cylindrical body and a square column body. Wherein, the material of the pillar structure 12 may include any one of the following: silicon dioxide, polysilicon, amorphous silicon, aluminum oxide, gallium nitride, silicon nitride and titanium dioxide.
Alternatively, the cylindrical structure 12 is a cylinder, and the cross-sectional dimension is the radius of the cylinder. The columnar structure 12 is a square column, and the size of the cross section is the side length of the cross section of the square column.
The columnar structures 12 may be formed as a unitary structure with both surfaces of the lens body 11 by means of growth etching. For example, a silicon dioxide film may be grown on the surface of the lens body 11, and then a cylindrical silicon dioxide film may be etched on the surface of the lens body 11 by etching.
Fig. 1B is a top view of a fish-eye lens structure according to an embodiment of the present disclosure. Referring to fig. 1B, the predetermined locations 15, the first columnar structure regions 31, the second columnar structure regions 32, and the columnar structures 12 are included. The plurality of columnar structures 12 may form a columnar structure region.
Optionally, when the number of the columnar structure regions is greater than or equal to 2, starting from the second columnar structure region, the columnar structure region is an annular region. For example, as shown in fig. 1B, a plurality of columnar structures 12 form a first columnar structure region 31 and a second columnar structure region 32, each of the columnar structures 12 having the same height, wherein the first columnar structure region 31 is a circular region with an origin at the preset position 15 and has a radius of r1, the second columnar structure region 32 is an annular region with an origin at the preset position 15 and has a large radius of r2, and the annular width of the second columnar structure region 32 is r2-r 1.
The preset position 15 may comprise a position within the surface of the lens body 11. Alternatively, the preset position 15 may be a central position of the surface.
In the first cylindrical structure region 31, the distance between each point and the preset position 15 is within a first distance range, wherein the maximum distance of the first distance range is the distance from the preset position 15 to the boundary of the first cylindrical structure region 31. For example, if the distance from the predetermined position 15 to the boundary of the first columnar structured area 31 is 10mm, the first distance ranges from 0mm to 10 mm. In the second columnar structure region 32, the distance between each point and the preset position 15 is within a second distance range, wherein the maximum distance of the second distance range is the distance from the preset position 15 to the boundary of the second columnar structure region 32, and the minimum distance of the second distance range is the distance from the preset position 15 to the boundary of the first columnar structure region 31. For example, if the distance from the preset position 15 to the boundary of the first columnar structured area 31 is 10mm, and the distance from the preset position 15 to the boundary of the second columnar structured area 32 is 20mm, the second distance ranges from 10mm to 20 mm. In each columnar structure region, the size of the cross section of the columnar structure 12 decreases in order in a direction away from the preset position 15. For example, in the first columnar structure region, the columnar structures 12 having a distance of 10 nm from the predetermined position 15 have a cross-sectional dimension of 20 nm, and the columnar structures 12 having a distance of more than 10 nm from the predetermined position 15 have a cross-sectional dimension of less than 20 nm.
The embodiment of the application provides a fisheye lens, which comprises a lens main body, wherein a plurality of cylindrical structures are respectively arranged on two surfaces of the lens main body, at least one cylindrical structure area is formed in each surface by the plurality of cylindrical structures, the distance between each point in the ith cylindrical structure area and a preset position is within the ith distance range, the preset position is a position in the surface, and i is an integer greater than or equal to 1; in every cylindricality structure region, along keeping away from the direction of predetermineeing the position, the size of the cross section of cylindricality structure diminishes in proper order, and like this, fisheye lens still can realize the control of being bare to the propagation direction when surpassing lens for the plane for the formation of image is focused to the light, and then has reduced the thickness of fisheye lens, in using actual product, can reduce the volume of product, has improved user's experience.
Next, the operation principle of the fisheye lens will be described with reference to fig. 2.
Fig. 2 is a schematic view of an operating principle of a fisheye lens provided in an embodiment of the present application. Referring to fig. 2, the lens includes a lens body 11, a light ray 24, a focusing surface 23 and a focusing point a. A plurality of cylindrical structures 12 are distributed on the first surface 21 and the second surface 22 of the fisheye lens. Alternatively, the size of the cross section of each columnar structure 12 varies according to the position of the columnar structure 12, and the position of the columnar structure 12 may be determined according to the columnar structure 12 and the preset position 15. For example, the position of the columnar structure 12 may be determined according to the distance between the columnar structure 12 and the preset position 15.
The columnar structures 12 having different cross-sectional dimensions can change the phase of the light rays 24 passing through the columnar structures 12 differently. Optionally, the light outgoing phase of the cylindrical structure 12 with the largest cross-sectional dimension is 0, the light outgoing phase of the cylindrical structure 12 with the smallest cross-sectional dimension is 2 pi, and the light outgoing phase can be controlled by setting the cylindrical structures 12 with different cross-sectional dimensions within the cross-sectional dimension range. For example, as shown in fig. 2, when the light ray 24 is irradiated to the first surface 21 of the lens body 11, the columnar structures 12 on the first surface 21 change the phase of the light ray 24 according to the size of the different cross-sections, so that the light ray 24 can pass through the lens body 11. When the light ray 24 passes through the lens body 11 and exits from the second surface 22 of the lens body 11, the cylindrical structure 12 on the second surface 22 changes the phase of the light according to the size of the cross section, so that the light ray 24 can be focused on the focusing point a on the focusing surface 23, and the focusing of the light ray 24 by the planar super lens can be realized.
Alternatively, the position of the cylindrical structure 12 may be determined according to the optical axes of the cylindrical structure 12 and the fisheye lens. For example, the distance between the columnar structure 12 and the optical axis of the fisheye lens, which is a reference line passing through the center position of the fisheye lens and perpendicular to the fisheye lens, may be identified as the position of the columnar structure 12.
Optionally, the fish-eye lens according to the embodiment of the present application may work in infrared, terahertz, microwave bands and sound waves.
The first surface and the second surface of lens main part in this application embodiment are provided with the different cylindricality structure of size of cross section, according to the different cylindricality structure of size of cross section, change the phase place of the light that passes the cylindricality structure. When light passes through the planar fisheye lens, the cylindrical structures on the upper surface and the lower surface of the fisheye lens can focus the light. Therefore, on the premise of ensuring light focusing, the thickness of the fisheye lens is reduced, the product size can be reduced when the fisheye lens is applied to an actual product, and the user experience is improved.
Next, the columnar structure region of the fisheye lens will be described with reference to fig. 3 to 4.
Fig. 3 is a schematic diagram of a cylindrical structural region of a fisheye lens according to an embodiment of the present disclosure. Referring to fig. 3, the structure includes a columnar structure 12, a columnar structure region 14, and a lattice 35. The plurality of columnar structures 12 form a columnar structure region 14 each having the same height, wherein the columnar structure region 14 is a circular region having a predetermined position 15 as an origin. The columnar structure region 14 includes a plurality of cells 35, and one columnar structure 12 is disposed in each cell 35. Alternatively, the grid may be rectangular, circular, and other irregular patterns. Optionally, if the area of the grid 35 is smaller than the preset threshold, the columnar structure 12 is not disposed in the grid. For example, if the area of the grid of the boundaries of the columnar structure regions is 10 square nanometers, and if the preset threshold value is 20 square nanometers, no columnar structure is disposed in the grid.
In the columnar structure region 14, the distance between each point and the preset position 15 is within a first distance range, wherein the maximum distance of the first distance range is the distance from the preset position 15 to the boundary of the columnar structure region 14. For example, if the distance from the predetermined position 15 to the boundary of the columnar structure region 14 is 10mm, the first distance ranges from 0mm to 10 mm.
As shown in fig. 3, the cross-sections of the columnar structures 12 at different positions have different sizes, and the smaller the distance between the columnar structure 12 and the preset position 15 is, the larger the size of the cross-section of the columnar structure 12 is, and the farther the distance between the columnar structure 12 and the preset position 15 is, the smaller the size of the cross-section of the columnar structure 12 is.
Optionally, in the columnar structure region 14, the exit phase of the light ray 24 passing through the columnar structure 12 with the largest cross-sectional dimension is 0, and the exit phase of the light ray 24 passing through the columnar structure 12 with the smallest cross-sectional dimension is 2 pi. Since the sizes of the cross sections of the columnar structures 12 in the columnar structure region 14 are sequentially decreased along the direction away from the preset position 15, the emergent phase range of the light ray 24 is 0-2 pi when the light ray 24 passes through the columnar structure 12, and the light ray 24 can be focused on one point.
Alternatively, the cylindrical structure 12 may be a square cylinder or a cylinder. The phase of the light 24 emerging can be controlled according to the size of the square and cylinder of different cross-section so that the light 24 is focused on one point.
Alternatively, the columnar structure region 14 may include a cylindrical body and a square column. For example, the cylindrical structure 12 on one side of the predetermined position 15 is a cylinder, and the cylindrical structure 12 on the other side of the predetermined position 15 is a square cylinder.
Fig. 4 is a schematic diagram of a cylindrical structure region of another fish-eye lens provided in an embodiment of the present application. Referring to fig. 4, the structure includes a columnar structure 12, a first columnar structure region 31, a second columnar structure region 32, and a grid 35. As shown in fig. 4, the plurality of columnar structures 12 form two columnar structure regions 14, each of the columnar structures 12 having the same height, wherein the first columnar structure region 31 is a circular region having an origin at the preset position 15 and has a radius of r1, the second columnar structure region 32 is an annular region having an origin at the preset position 15 and has a large radius of r2, and the second columnar structure region 32 has an annular width of r2 to r 1.
The first columnar structure region 31 and the second columnar structure region 32 include a plurality of cells 35 therein, and one columnar structure 12 is provided in each cell 35. Alternatively, the grid may be rectangular, circular, and other irregular patterns. Optionally, if the area of the grid 35 is smaller than the preset threshold, the columnar structure 12 is not disposed in the grid. For example, if the area of the grid of the boundaries of the columnar structure regions is 10 square nanometers, and if the preset threshold value is 20 square nanometers, no columnar structure is disposed in the grid.
As shown in fig. 4, in the first columnar structure region 31, the sizes of the cross sections of the cylindrical columnar structures at different positions are different, the closer the columnar structure 12 is to the preset position 15, the larger the size of the cross section of the columnar structure 12 is, and the farther the columnar structure 12 is from the preset position 15, the smaller the size of the cross section of the columnar structure 12 is. In the second columnar structure region 32, the cross sections of the columnar structures 12 at different positions are different in size, the closer the columnar structures 12 are to the preset position 15, the larger the size of the cross sections of the columnar structures 12 is, and the farther the columnar structures 12 are from the preset position 15, the smaller the size of the cross sections of the columnar structures 12 is.
Alternatively, the columnar structure 12 having the largest cross-sectional dimension of the first columnar structure region 31 is the same as the cross-sectional dimension of the columnar structure 12 having the largest cross-sectional dimension of the second columnar structure region 32. The columnar structure 12 having the smallest cross-sectional dimension of the first columnar region 31 is the same as the columnar structure 12 having the smallest cross-sectional dimension of the second columnar structure region 32.
Alternatively, the exit phase of the light ray 24 at different cross-sectional dimensions of the columnar structures 12 is different, and the exit phase increases with decreasing cross-sectional dimension of the columnar structures 12, but the number of columnar structures 12 in different columnar structure regions 14 is different because the increase in exit phase is not a linear increase.
Alternatively, in the first columnar structure region 31 and the second columnar structure region 32, the exit phase of the light ray 24 passing through the columnar structure 12 with the largest cross-sectional dimension is 0, and the exit phase of the light ray 24 passing through the columnar structure 12 with the smallest cross-sectional dimension is 2 pi. Since the sizes of the cross sections of the columnar structures 12 in the columnar structure region 14 are sequentially decreased along the direction away from the preset position 15, the emergent phase range of the light ray 24 is 0-2 pi when the light ray 24 passes through the columnar structure, and the light ray 24 can be focused on one point.
Alternatively, the cylindrical structure 12 may be a square cylinder or a cylinder. The phase of the light 24 emitted can be controlled according to the different heights of the square and the cylinder, so that the light 24 is focused on one point.
Alternatively, the columnar structure region 14 may include a cylindrical body and a square column. For example, the cylindrical structure 12 on one side of the predetermined position 15 is a cylinder, and the cylindrical structure 12 on the other side of the predetermined position 15 is a square cylinder.
Alternatively, in the columnar structure region of the fisheye lens shown in fig. 4, the columnar structures 12 may be columnar structures 12 having the same cross-sectional size and different heights, and the closer the columnar structure 12 is to the preset position 15, the lower the height of the columnar structure 12 is, and the farther the columnar structure 12 is from the preset position 15, the higher the height of the columnar structure 12 is, in the first columnar structure region 31 and the second columnar structure region 32. The exit phase of the light ray 24 passing through the pillar-shaped structure 12 with the highest height is 0, and the exit phase of the light ray 24 passing through the pillar-shaped structure 12 with the lowest height is 2 pi. Since the heights of the columnar structures 12 are sequentially increased in the first columnar structure region 31 and the second columnar structure region 32 along the direction away from the preset position 15, when the light ray 24 passes through the columnar structures 12, the outgoing phase range of the light ray 24 is 0-2 pi, and the light ray 24 can be focused on one point.
Alternatively, the columnar structures 12 may form a plurality of columnar structure regions 14, starting from the second columnar structure region 32, the columnar structure regions 14 are annular regions, and the variation range of the emergent phase of the light ray 24 in each columnar structure region 14 is 0-2 pi.
The column structure will be described with reference to fig. 5 to 6.
Fig. 5 is a schematic diagram of a cylindrical structure of a cylinder according to an embodiment of the present application. See fig. 5, comprising a cylindrical columnar structure 33 and a grid 35. P is the side length of the grid 35 of the cylindrical structure 33, h is the height of the cylindrical structure 33, and r is the cross-sectional radius of the cylindrical structure 33. Alternatively, the side length of the lattice 35 of the cylindrical structures 33, the height of the cylindrical structures 33, and the radius of the cylindrical structures 33 may be determined according to the materials of the cylindrical structures 12 and the lens body 11. As shown in table 1:
TABLE 1
It should be noted that table 1 illustrates, by way of example only, the determination of the side length of the grid 35 of the cylindrical columnar structure 33, the height of the cylindrical columnar structure 33, and the radius of the cylindrical columnar structure 33 according to the materials of the columnar structure 12 and the lens body 11, and does not limit the side length of the grid 35 of the cylindrical columnar structure 33, the height of the cylindrical columnar structure 33, and the radius of the cylindrical columnar structure 33.
Alternatively, the height of the columnar structure 12 may be determined according to the following formula:
wherein
Is the outgoing phase value of the electromagnetic wave,
is the effective refractive index of the material of the columnar structure, h is the height of the columnar structure 12,
is the frequency of the electromagnetic wave, and c is the speed of light in vacuum.
Alternatively, there is only one cylindrical columnar structure 33 within the grid 35 of length P. The number of cylindrical structures 33 can be determined from the side length of the grid 35. For example, the number of the cylindrical columnar structures 33 in the first surface 21 may be determined according to a ratio of the area of the first surface 21 to the area of each lattice.
Alternatively, the height of the cylindrical structures 33 may be a fixed height, and the emergent phase of the light ray 24 is controlled according to the size of the cross section of different cylindrical structures 33.
Fig. 6 is a schematic diagram of a square column structure according to an embodiment of the present application. See fig. 6, which includes a square column-shaped structure 34 and a grid 35. P is the side length of the grid 35 of the square cylindrical structure 34, h is the height of the square cylindrical structure 34, and a is the side length of the square cylindrical structure 34. Alternatively, the side length of the lattice 35 of the square columnar structure 34, the height of the square columnar structure 34, and the side length of the square columnar structure 34 may be determined according to the materials of the columnar structure 12 and the lens body 11. As shown in table 2:
TABLE 2
It should be noted that table 2 illustrates, by way of example only, the determination of the side length of the mesh 35 of the square cylindrical structure 34, the height of the square cylindrical structure 34, and the radius of the square cylindrical structure 34 according to the materials of the cylindrical structure 12 and the lens body 11, and is not limited to the side length of the mesh 35 of the square cylindrical structure 34, the height of the square cylindrical structure 34, and the side length of the square cylindrical structure 34.
Optionally, within the grid 35 having a side length P, there is only one square-cylindrical structure 34. The number of the square cylindrical structures 34 can be determined according to the side length of the grid 35. For example, the number of the square pillar structures 34 in the first surface 21 may be determined according to the ratio of the area of the first surface 21 to the area of each lattice.
Alternatively, the height of the square columnar structure 34 may be a fixed height, and the emergent phase of the light ray 24 is controlled according to the cross-sectional dimensions of different square columnar structures 34.
Next, the structure of the lens body 11 will be described with reference to fig. 7.
Fig. 7 is a schematic structural diagram of a lens body according to an embodiment of the present application. Referring to fig. 7, the lens body 11 and the columnar structure region 14 are included. The surface of the lens body 11 may form the cylindrical structure region 14, the lens body 11 may include a planar superlens, a curved superlens, and the shape of the lens body 11 may include a circle, a square, and other irregular polygons.
Alternatively, the material of the lens body 11 may include silicon dioxide, aluminum oxide, or the like. The planar super lens can reduce the thickness of the fisheye lens, and when the planar super lens is applied to actual products, the size of the products can be reduced, and the user experience is improved.
Next, the selection of the cross-sectional dimensions of the columnar structure will be described with reference to fig. 8 to 9.
Fig. 8 is a schematic diagram of electromagnetic field simulation of a cross section of a columnar structure provided in an embodiment of the present application. Referring to fig. 8, an electromagnetic field simulation diagram including a radius of the pillar structure 12 of 60nm, a radius of the pillar structure 12 of 80nm, and a radius of the pillar structure 12 of 95nm is shown. The simulated schematic diagram includes the body of the fisheye lens, the columnar structures 12 and the polarization strength 41 of the electric field. A plane wave linearly polarized in the x direction propagates in the positive z-axis direction, Ex represents an electric field component in the x direction, and Hy represents a magnetic field component in the y direction. The columnar structure 12 having a radius of 60nm, the columnar structure 12 having a radius of 80nm, and the columnar structure 12 having a radius of 95nm have different electromagnetic field responses, that is, the emission phases of electromagnetic waves are different for the columnar structures 12 having different radii.
Fig. 9 is a schematic diagram of the variation of the phase and effective transmittance of the emergent electromagnetic wave with the radius of the cylindrical structure 12 according to the embodiment of the present application. The thickness of the body of the fisheye lens subjected to the simulation experiment is 2mm, the area of the first surface 21 is 6mm, the area of the second surface 22 is 8mm, the columnar structure 12 is a cylinder, the height is 350nm, and the variation range of the cross-sectional dimension of the columnar structure 12 is 45nm-100 nm. Referring to fig. 9, the horizontal axis is the cross-sectional dimension, the left vertical axis is the effective transmittance, the right vertical axis is the emergent phase, the curve 42 is the variation relationship curve between the emergent phase and the cross-sectional dimension, and the curve 43 is the variation relationship curve between the effective transmittance and the cross-sectional dimension.
As shown in fig. 9, when the radius of the columnar structure 12 is increased, the emission phase of the electromagnetic wave is nonlinearly monotonically decreased. When the radius is changed from 40nm to 95nm, the effective transmittance is changed very little and is always maintained in a relatively high state, the characteristic of high transmittance of the all-dielectric super-surface is shown, and the phase change covers the range of 0-2 pi, so that the random control on the phase of the emergent electromagnetic wave can be realized.
Alternatively, the light 24 can be focused by selecting the columnar structure with the cross-sectional dimension varying from 40nm to 95nm in different columnar structure regions 14.
Alternatively, the cross-sectional dimensions of the columnar structures 12 may be fixed, and the light 24 may be focused by selecting columnar structures 12 of different heights.
Next, an imaging system to which the fish-eye lens of the present invention is applied will be described with reference to fig. 10.
Fig. 10 is a schematic structural diagram of an imaging system according to an embodiment of the present application. Referring to fig. 10, the device includes a fisheye lens 53, a tube 51, a standardized compact ccd image sensor 52, and a light ray 24. The fisheye lens 53 and the standardized small CCD image sensor 52 are connected through the pipe sleeve 51, and light rays are imaged on a focal plane under the action of the surface of the fisheye lens.
Alternatively, two fisheye lenses may be placed back-to-back to implement a 360-degree panoramic imaging system. Alternatively, the fisheye lens may be adapted for use with an endoscope lens, an endoscope, a single lens, or the like.
The embodiment of the application also provides a camera device, and the camera device comprises the imaging system. For example, the image capture device may include a single lens reflex camera.
The embodiment of the application also provides electronic equipment, and the electronic equipment comprises the imaging system. For example, the electronic device may be: cell phone, computer.
The embodiment of the application further provides a vehicle-mounted system, and the vehicle-mounted system comprises the imaging system. For example, the on-board system may be: vehicle radar imaging system.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the embodiments of the present application, and are not limited thereto; although the embodiments of the present application have been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the embodiments of the present application.
Claims (6)
1. A fisheye lens comprising a lens body having a plurality of cylindrical structures provided on both surfaces thereof, wherein,
in each surface, the plurality of columnar structures form at least one columnar structure region, the distance between each point in the ith columnar structure region and a preset position is within the ith distance range, the preset position is a position in the surface, and i is an integer greater than or equal to 1;
in each columnar structure region, along the direction away from the preset position, the size of the cross section of each columnar structure is sequentially reduced;
the two surfaces are respectively circular;
the 1 st cylindrical structure area is a circular area taking the preset position as an origin;
the number of the at least one cylindrical structure region is greater than or equal to 2, and when i is greater than or equal to 2, the ith cylindrical structure region is an annular region;
the variation range of the emergent phase of each cylindrical structure region is 0-2 pi;
selecting a cylindrical structure with the cross section size varying range of 40nm-95nm in different cylindrical structure regions, and focusing light;
the two surfaces include a first surface and a second surface, the first surface having a radius less than a radius of the second surface, the second surface having a radius 1.5 times the radius of the first surface.
2. The fish-eye lens of claim 1 wherein the predetermined position is a center position of the surface.
3. The fish-eye lens of claim 1 wherein the cylindrical structure is a cylinder and the cross-sectional dimension is a radius of the cylinder.
4. The fish-eye lens of claim 1 wherein the cylindrical structure is a square cylinder and the dimension of the cross section is a side length of the cross section of the square cylinder.
5. The fish-eye lens of claim 1 wherein the lens body is a superlens.
6. The fisheye lens of claim 1, wherein the columnar structure is made of any one of the following materials: silicon dioxide, polysilicon, amorphous silicon, aluminum oxide, gallium nitride, silicon nitride and titanium dioxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010539738.0A CN111427105B (en) | 2020-06-15 | 2020-06-15 | Fish-eye lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010539738.0A CN111427105B (en) | 2020-06-15 | 2020-06-15 | Fish-eye lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111427105A CN111427105A (en) | 2020-07-17 |
| CN111427105B true CN111427105B (en) | 2021-07-27 |
Family
ID=71559068
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010539738.0A Active CN111427105B (en) | 2020-06-15 | 2020-06-15 | Fish-eye lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111427105B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113900247A (en) * | 2021-09-13 | 2022-01-07 | 北京航空航天大学 | Endoscope with a detachable handle |
| CN115201945A (en) * | 2022-07-13 | 2022-10-18 | 云南师范大学 | Terahertz lens based on pseudo surface plasmon |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103547956B (en) * | 2011-04-20 | 2016-06-15 | 惠普发展公司，有限责任合伙企业 | Based on the optical element of sub-wave length grating |
| CN105487145B (en) * | 2016-01-20 | 2017-12-29 | 浙江大学 | A kind of method for surpassing surface structure ultra thin optical lens based on artificial micro-structure |
| WO2018204856A1 (en) * | 2017-05-04 | 2018-11-08 | President And Fellows Of Harvard College | Meta-lens doublet for aberration correction |
| KR102444288B1 (en) * | 2017-11-08 | 2022-09-16 | 삼성전자주식회사 | Projector including nanostructured optical lens |
| CN109031477A (en) * | 2018-09-20 | 2018-12-18 | 中山大学 | A kind of cascade wide angle plane camera lens production method in the super surface of all dielectric |
| CN109164518A (en) * | 2018-10-11 | 2019-01-08 | 业成科技（成都）有限公司 | Super lens, preparation method and the optical module using it |
| CN110007451B (en) * | 2019-04-08 | 2022-04-01 | 哈尔滨工业大学（深圳） | Super-surface microscope, preparation method thereof and optical path measuring system |
| CN111025436B (en) * | 2020-03-10 | 2020-06-09 | 南京微纳科技研究院有限公司 | Fisheye lens parameter determination method, device and equipment |
-
2020
- 2020-06-15 CN CN202010539738.0A patent/CN111427105B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN111427105A (en) | 2020-07-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11681126B2 (en) | Optical imaging system and portable electronic device including the same | |
| US8947578B2 (en) | Apparatus and method of capturing image | |
| CN110888216B (en) | Optical lens, lens module and terminal | |
| CN111427105B (en) | Fish-eye lens | |
| CN110913096A (en) | Camera module and electronic equipment | |
| US8525914B2 (en) | Imaging system with multi-state zoom and associated methods | |
| JP2003270526A (en) | Imaging optical system | |
| US10330889B2 (en) | Planar varifocal lens | |
| CN108957708B (en) | Telescope lens | |
| JP2005084387A (en) | Imaging lens and imaging apparatus | |
| WO2017174867A1 (en) | Wide angle lens for capturing a panorama image | |
| KR20190035634A (en) | Optical system and portable electronic device including the same | |
| JP2014109666A (en) | Zoom lens and imaging apparatus having the same | |
| CN115151862A (en) | Camera assembly | |
| CN111308741B (en) | Small concave imaging device and imaging method based on liquid crystal lens | |
| JP2023544219A (en) | Large diameter continuous zoom bending telecamera | |
| KR102052803B1 (en) | Optical system | |
| Yen et al. | The vehicle zoom ultra wide angle lens design by using liquid lens technology | |
| CN216118182U (en) | Wide screen lens of microspur deformation and have its digital camera, video camera | |
| Liu et al. | 10× Optical Zoom Phone Camera Design | |
| JP2010237679A (en) | Imaging lens and imaging apparatus | |
| Liu et al. | $\mathbf {10}\times $ Optical Zoom Phone Camera Design | |
| Zhao et al. | Design and implementation of a Cooke triplet based wave-front coded super-resolution imaging system | |
| CN113721352A (en) | Wide screen lens of microspur deformation and have its digital camera, video camera | |
| CN114415272A (en) | Birefringent crystal lens and imaging device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |