CN216387440U - Ultra-thin Fresnel lens - Google Patents
Ultra-thin Fresnel lens Download PDFInfo
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- CN216387440U CN216387440U CN202123212082.0U CN202123212082U CN216387440U CN 216387440 U CN216387440 U CN 216387440U CN 202123212082 U CN202123212082 U CN 202123212082U CN 216387440 U CN216387440 U CN 216387440U
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Abstract
The utility model discloses an ultra-thin Fresnel lens, which comprises a Fresnel lens and a lens frame, wherein the Fresnel lens comprises two completely same lens layer regions which are axially symmetrically arranged, two surfaces of each lens layer region are respectively a light inlet surface and a light outlet surface, the light outlet surface is a plane, 11 circles of concentric Fresnel gear rings with the diameters from small to large are recorded on the light inlet surface, the heights of the multiple circles of Fresnel gear rings are different, the tooth spaces of every two adjacent Fresnel gear rings are also different, the section of each circle of Fresnel gear rings along the diameter of the Fresnel gear rings is in a sawtooth shape, and the sharp top of the sawtooth shape is in a circular arc shape; the Fresnel lens is small in thickness, can meet the installation requirement of an ultrathin machine body, and the tooth heights, tooth shapes and tooth spaces of multiple circles of Fresnel gear rings in the Fresnel lens are inconsistent, so that light can be refracted more, the gathering effect is better, and the brightness and the uniformity are better.
Description
Technical Field
The utility model belongs to the field of optical lenses, and particularly relates to an ultrathin Fresnel lens.
Background
Along with the development of smart phones, more and more mobile phones are developed to the aspect of lightness and thinness, the thickness of the phone body directly influences the handheld holding feeling of a user, and the lighter and thinner mobile phones are lighter and lighter to carry. The existing mobile phones are basically consistent in hardware and software, and only have differences in appearance and workmanship. The most obvious difference lies in that a camera of the mobile phone needs to be provided with a flash lamp lens to assist shooting, the thickness of a light supplement lampshade in the traditional design needs to be at least more than 0.5mm, and the requirements of injection molding and optics can be met.
Disclosure of Invention
In view of the above problems and technical needs, the present invention provides an ultra-thin fresnel lens.
The technical scheme of the utility model is as follows: an ultra-thin Fresnel lens comprises a Fresnel lens body and a lens frame, wherein the Fresnel lens body comprises two completely same lens layer areas which are arranged in an axial symmetry mode, two surfaces of each lens layer area are a light inlet surface and a light outlet surface respectively, the light outlet surface is a plane, 11 circles of concentric Fresnel gear rings with diameters from small to large are recorded on the light inlet surface, the heights of the multiple circles of Fresnel gear rings are different, the tooth spaces of every two adjacent Fresnel gear rings are different, the section of each circle of Fresnel gear rings along the diameter of the Fresnel gear rings is in a sawtooth shape, and the top of each sawtooth shape is in a circular arc shape. Under the maximum visual angle of the LED flash lamp, the visual angle is 85 degrees, the central brightness can reach 78LX, and the uniformity of the illumination periphery reaches 27%.
Furthermore, the thickness of the lens frame is 0.2mm, and the tooth height of each circle of Fresnel gear ring is lower than the plane of the lens frame on the side. The texture height of the light incident surface is lower than that of the lens frame, the whole thickness of the Fresnel lens is the thickness of the lens frame, and the Fresnel lens has a protection effect on an effective refraction area.
Furthermore, one of the light incident surface regions of the two lens layer regions is aligned with the LED flash lamp, and the other is aligned with the color temperature sensor.
Furthermore, a plurality of circles of circular arc-shaped gear rings concentric with the Fresnel gear ring with the maximum diameter are arranged on the outer side of the Fresnel gear ring with the maximum diameter. The circular arc-shaped gear rings are used as supplement, so that the gap part between the two groups of symmetrical Fresnel gear rings can be filled, the function of processing light is also exerted, and the uniformity of the light is better.
Furthermore, each circle of Fresnel gear ring consists of an inner refraction surface, a circular arc tooth tip part and an outer refraction surface, wherein the inclination range of the outer refraction surface towards the direction of the circle center is larger than that of the inner refraction surface, and the width of the outer refraction surface is larger than that of the inner refraction surface.
Furthermore, the radius corresponding to the arc tooth tip of each circle of Fresnel gear ring is 0.01 mm.
Further, the area surrounded by the innermost circle of the Fresnel gear ring is conical, and the conical degree of the area is not more than 150 degrees.
Compared with the prior art, the utility model has the beneficial effects that: the Fresnel lens changes the thickness of the traditional mobile phone camera lens, and controls the whole thickness within 0.2mm, so that the Fresnel lens can be adapted to the thickness requirement of the current mobile phone, and the effect of lighter and thinner body is achieved; the light incident surfaces of the two lens layer regions are respectively aligned with the LED flash lamp and the color temperature sensor, so that mixed color light can be provided to simulate the light of the sun, the color shot under dark light is closer to the primary color, the color tone is more neutral, and the shooting experience of the mobile phone is better; the tooth height, the tooth shape and the inter-tooth distance of each circle of the Fresnel gear rings are different, so that light can be refracted more, the gathering effect is better, and the brightness and the uniformity are better.
Drawings
FIG. 1 is a three-dimensional structure diagram of the ultra-thin Fresnel lens of the present invention;
FIG. 2 is a front view of the ultra-thin Fresnel lens of the present invention;
FIG. 3 is a cross-sectional view taken at A in FIG. 2;
FIG. 4 is a cross-sectional view taken at B in FIG. 2;
FIG. 5 is an enlarged view at C of FIG. 4;
labeled as: fresnel lens 1, lens frame 2, income plain noodles 3, play plain noodles 4, Fresnel ring gear 5, circular arc ring gear 6, internal refraction face 7, circular arc tooth point portion 8, outer refraction face 9.
Detailed Description
The utility model is further described below with reference to the figures and examples.
As shown in fig. 1-5, the ultra-thin fresnel lens of the present invention includes a fresnel lens 1 and a lens frame 2, wherein the fresnel lens 1 includes two identical lens layer regions arranged in axial symmetry.
The two surfaces of the lens layer regions are respectively a light incident surface 3 and a light emergent surface 4, the light emergent surface 4 is a plane, a plurality of circles of concentric Fresnel gear rings 5 with the diameters from small to large are recorded on the light incident surface 3, one of the light incident surface 3 regions of the two lens layer regions is aligned with the LED flash lamp, and the other is aligned with the color temperature sensor.
Eleven circles of Fresnel gear rings 5 are recorded on the light incident surface 3, the heights of the multiple circles of Fresnel gear rings 5 are different, the tooth space between every two adjacent Fresnel gear rings 5 is also different, the section of each circle of Fresnel gear rings 5 along the diameter of the circle of Fresnel gear rings is in a sawtooth shape, and the tip of the sawtooth shape is in a circular arc shape. Specifically, each circle of Fresnel gear ring 5 consists of an inner refraction surface 7, a circular arc tooth tip 8 and an outer refraction surface 9, wherein the inclination range of the outer refraction surface 9 towards the circle center direction is larger than that of the inner refraction surface 7, and the width of the outer refraction surface 9 is larger than that of the inner refraction surface 7; the corresponding radius of the circular arc tooth tip 8 of each circle of Fresnel gear ring 5 is 0.01 mm.
The outer side of the Fresnel gear ring 5 with the largest diameter is also provided with a plurality of circles of circular-arc-shaped gear rings 6 which are concentric with the Fresnel gear ring 5, and the circular-arc-shaped gear rings 6 are used as supplements, so that the gap part between the two groups of symmetrical Fresnel gear rings 5 can be filled, the function of processing light rays is also played, and the uniformity of the light rays is better.
The thickness of the lens frame 2 is 0.2mm, and the tooth height of each circle of Fresnel gear ring 5 is lower than the plane of the lens frame 2 at the side. The area surrounded by the innermost circle of the Fresnel gear ring 5 is conical, and the conicity of the area is not more than 150 degrees.
The whole thickness of Fresnel lens 1 limits within 0.2mm, and the texture height of income plain noodles 3 all is less than lens frame 2 place plane, and this has the guard action to Fresnel lens 1's effective refraction region to make this Fresnel lens 1's of installation cell-phone fuselage lighter and thinner. The tooth height, the tooth shape and the inter-tooth distance of each circle of the multi-circle Fresnel gear ring 5 are different, so that the light refraction is more, the gathering effect is better, the brightness and the uniformity are better, under the maximum visual angle of the LED flash lamp, the visual angle is 85 degrees, the central brightness can reach 78LX, and the uniformity of the illumination periphery reaches 27%.
The above description is only for the preferred embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes and substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. An ultra-thin Fresnel lens is characterized in that: the Fresnel lens comprises two completely same lens layer regions which are axially symmetrically arranged, the two surfaces of each lens layer region are a light inlet surface and a light outlet surface respectively, the light outlet surface is a plane, 11 circles of concentric Fresnel gear rings with diameters from small to large are recorded on the light inlet surface, the heights of the multiple circles of Fresnel gear rings are different, the tooth spaces of every two adjacent Fresnel gear rings are different, the section of each circle of Fresnel gear rings along the diameter of the Fresnel gear rings is in a sawtooth shape, and the sharp top of the sawtooth shape is in a circular arc shape.
2. The ultra-thin fresnel lens of claim 1, wherein: the thickness of the lens frame is 0.2mm, and the tooth height of each circle of Fresnel gear ring is lower than the plane of the lens frame on the side.
3. The ultra-thin fresnel lens of claim 1, wherein: one of the light incident surface regions of the two lens layer regions is aligned with the LED flash lamp, and the other is aligned with the color temperature sensor.
4. The ultra-thin fresnel lens of claim 1, wherein: and a plurality of circles of circular arc-shaped gear rings concentric with the Fresnel gear ring with the maximum diameter are arranged on the outer side of the Fresnel gear ring with the maximum diameter.
5. The ultra-thin fresnel lens of claim 1, wherein: each circle of Fresnel gear ring consists of an inner refraction surface, a circular arc tooth tip part and an outer refraction surface, wherein the inclination amplitude of the outer refraction surface towards the direction of the circle center is larger than that of the inner refraction surface, and the width of the outer refraction surface is larger than that of the inner refraction surface.
6. The ultra-thin fresnel lens of claim 5, wherein: the corresponding radius of the arc tooth tip of each circle of Fresnel gear ring is 0.01 mm.
7. The ultra-thin fresnel lens of claim 1, wherein: the area surrounded by the innermost circle of the Fresnel gear ring is conical, and the conicity of the area is not more than 150 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123212082.0U CN216387440U (en) | 2021-12-20 | 2021-12-20 | Ultra-thin Fresnel lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123212082.0U CN216387440U (en) | 2021-12-20 | 2021-12-20 | Ultra-thin Fresnel lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216387440U true CN216387440U (en) | 2022-04-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123212082.0U Active CN216387440U (en) | 2021-12-20 | 2021-12-20 | Ultra-thin Fresnel lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216387440U (en) |
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2021
- 2021-12-20 CN CN202123212082.0U patent/CN216387440U/en active Active
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