CN111596503A - Mobile phone flash cover and design method based on three-dimensional stripe astigmatism - Google Patents

Abstract

The invention relates to the technical field of a mobile phone flashlight shade, in particular to a mobile phone flashlight shade based on three-dimensional fringe astigmatism and a design method thereof, wherein the mobile phone flashlight shade comprises a main body part and an edge installation part, the edge installation part is positioned at the periphery of the main body part, the outer surface of the main body part is provided with two thread astigmatism structures which are arranged in parallel, each thread astigmatism structure is provided with a central convex surface part and a plurality of astigmatism stripes, the astigmatism stripes are in an arc shape, the astigmatism stripes and the central convex surface part are arranged concentrically, the cross sections of the astigmatism stripes are in an inverted V shape, and the top parts; the height of the light scattering stripes is 7-10 times of the radius of the semi-circular arc surface. According to the mobile phone flash lamp cover based on three-dimensional fringe astigmatism and the design method thereof, the designed lamp cover has a better light scattering effect, the average uniformity and the minimum uniformity of flash lamp illumination are improved, and the phenomenon of distortion caused by the fact that illumination simulation tests are completely dependent on LightTools is avoided.

Description

Mobile phone flash cover and design method based on three-dimensional stripe astigmatism

technical field

The invention relates to the technical field of mobile phone flash covers, in particular to a mobile phone flash cover based on three-dimensional stripe astigmatism and a design method thereof.

Background technique

The flash greatly affects the camera performance of the mobile phone. The minimum uniformity and average uniformity of the flash light are important indicators of the effect of the flash. Generally, a lampshade is set outside the flash to improve the scattering performance and the uniformity of the astigmatism. The lampshade is generally a double-sided concave lens. Although it can improve the average uniformity, its minimum uniformity still cannot meet the needs of current mobile phones for high-definition photography.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a mobile phone flash cover based on three-dimensional stripe astigmatism and a design method thereof in view of the deficiencies of the prior art.

In order to achieve the above purpose, the mobile phone flash cover based on the three-dimensional stripe astigmatism of the present invention includes a main body part and an edge mounting part, the edge mounting part is located at the periphery of the main body part, and the first surface of the main body part is provided with two thread astigmatism arranged side by side. Structure, the threaded astigmatism structure is provided with a central convex part and a plurality of astigmatism stripes, the astigmatism stripes are arc-shaped, the astigmatism stripes are arranged concentrically with the central convex part, the cross-section of the astigmatism stripes is an inverted V shape, and the top of the astigmatism stripes is provided with half a half. Circular surface; the height of the astigmatism stripes is 7 to 10 times the radius of the semicircular surface.

Further, the radius of the semicircular arc surface is 0.01mm˜0.5mm.

Further, the second surface of the main body is provided with an astigmatic concave surface, the distance L1 between the two adjacent astigmatic stripes, the height H of the astigmatic stripes, the curvature radius R of the astigmatic concave surface, and the transparency of the main body. The relationship between the light rate X, the number of astigmatism stripes Y of a single thread astigmatism structure, and the minimum distance L2 between the upper vertex of the central convex portion and the astigmatic concave portion is R/8.68=(Y-1)*L1+(L2 -H)*X.

Further, the radius of the astigmatic concave surface is 70 to 100 times the height of the astigmatic stripes.

Further, the threaded astigmatism structure includes at least four annular astigmatism stripes arranged concentrically.

In order to achieve the above purpose, the design method of the mobile phone flash cover of the present invention comprises the following steps:

A. Design the structure of the mobile phone flash cover: make the structure of the mobile phone flash cover include a main body part and an edge mounting part, the edge mounting part is located on the periphery of the main body part, and the first surface of the main body part is provided with two threaded light scattering structures arranged side by side, The threaded astigmatism structure is provided with a central convex part and a plurality of astigmatism stripes, the astigmatism stripes are arc-shaped, the astigmatism stripes are arranged concentrically with the central convex part, the cross-section of the astigmatism stripes is an inverted V shape, and the top of the astigmatism stripes is provided with a semi-circular arc The height of the astigmatism stripes is 7 to 10 times the radius of the semicircular arc surface; the second surface of the main body is provided with an astigmatic concave surface;

B. Process the reference samples A1 and A2 respectively: in the reference sample A1, the astigmatism stripes are divided into several regions, so that the height H of the astigmatism stripes in several regions increases in turn; the light concave surface in the reference sample A2 is divided into several regions, so that The curvature radius R of the astigmatic concave surface in several areas increases sequentially;

C. Use a flash tester to test A1 and A2: choose a 165-lumen LED as the light source, test the average uniformity, minimum uniformity, and maximum color temperature difference of the benchmark samples A1 and A2, and analyze the benchmark samples A1 and A2. The area of the height H of the astigmatism stripes and the area of the radius of curvature R of the concave surface of the astigmatism required by the uniformity, the minimum uniformity, and the maximum color temperature difference, so as to determine the height H of the astigmatism stripes and the value of the radius of curvature R;

D. L2 is set to 1.71 mm, Y is determined to be 5, and the value of L1 is determined according to R/8.68=(Y-1)*L1+(L2-H)*X.

Further, the several areas are 6 areas.

Beneficial effects of the present invention: the mobile phone flash cover based on three-dimensional stripe astigmatism and the design method thereof of the present invention have good astigmatism effect, and the flash light enters through the first surface of the main body part and exits from the second surface of the main body part , the central convex part and the refraction of multiple astigmatism stripes make the light scattering effect better and improve the average uniformity and minimum uniformity of the flash light. The design method of the mobile phone flash cover of the present invention avoids the distortion caused by completely relying on the use of LightTools for lighting simulation test.

Description of drawings

1 is a schematic cross-sectional structural diagram of a mobile phone flash cover based on three-dimensional stripe astigmatism of the present invention.

FIG. 2 is a schematic three-dimensional structure diagram of a mobile phone flash cover based on three-dimensional stripe astigmatism of the present invention.

3 is a schematic structural diagram of a front-view mobile phone flash cover based on three-dimensional stripe astigmatism according to the present invention.

FIG. 4 is a simulated illuminance distribution of the LED flash without using the three-dimensional striped astigmatism flash cover of the mobile phone with the double-threaded structure of the present invention.

FIG. 5 is a simulated illuminance distribution of the LED flash using the three-dimensional striped astigmatism flash cover of the mobile phone with the double-threaded structure of the present invention.

Reference numerals include:

1—Main body

11—Central Convex 12—Astigmatism Stripes

13—Semi-circular arc surface 14—Astigmatism concave surface

2—Edge mounting part 3—Thread astigmatism structure

L1—the distance between two adjacent astigmatism fringes

H—the height of the astigmatism fringes

R—the radius of curvature of the concave surface of the astigmatism

L2—the minimum distance between the upper vertex of the central convex surface and the astigmatic concave surface.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIGS. 1 to 4 , the mobile phone flash cover based on three-dimensional stripe astigmatism of the present invention includes a main body part 1 and an edge mounting part 2 . The edge mounting part 2 is located at the periphery of the main body part 1 , and the first surface of the main body part 1 is provided There are two thread astigmatism structures 3 arranged side by side, the thread astigmatism structure 3 is provided with a central convex portion 11 and a plurality of astigmatism stripes 12, the astigmatism stripes 12 are arc-shaped, the astigmatism stripes 12 are arranged concentrically with the central convex portion 11, and the astigmatism stripes 12 The cross section of the astigmatism stripe 12 is an inverted V shape, and the top of the astigmatism stripes 12 is provided with a semicircular arc surface 13 ; The flash light enters through the first surface of the main body part 1, exits from the second surface of the main body part 1, and is refracted by the central convex part 11 and the plurality of astigmatic stripes 12 when it is emitted, so that the light scattering effect is better, and the flash light is improved. Average and minimum uniformity of lighting, reducing color temperature differences. It can be seen from the comparison between FIG. 4 and FIG. 5 that the mobile phone flash cover based on the three-dimensional stripe astigmatism of the present invention improves the average uniformity and minimum uniformity of the flash illumination.

Further, the radius of the semicircular arc surface 13 is 0.01mm˜0.5mm. The mobile phone flash cover based on the three-dimensional stripe astigmatism of the present invention further improves the average uniformity and minimum uniformity of the flash illumination.

Further, the second surface of the main body part 1 is provided with an astigmatic concave surface 14 , the distance L1 between the two adjacent astigmatic stripes 12 , the height H of the astigmatic stripes 12 , and the curvature radius R of the astigmatic concave surface 14 . The relationship between the light transmittance X of the main body part 1, the number Y of the astigmatism stripes 12 of the single threaded astigmatism structure 3, and the minimum distance L2 between the upper vertex of the central convex part 11 and the astigmatic concave part 14 is R/8.68 =(Y-1)*L1+(L2-H)*X. The mobile phone flash cover based on the three-dimensional stripe astigmatism of the present invention further improves the average uniformity and minimum uniformity of the flash illumination. Under 1.0FOV, using the mobile phone flash cover based on three-dimensional stripe astigmatism of the present invention, the average uniformity is increased from 18.81% to 39.3%, the minimum uniformity is increased from 18.81% to 38.89%, and the color temperature difference is reduced from 214 to 73.

Further, the radius of the astigmatic concave portion 14 is 70 to 100 times the height of the astigmatic stripes 12 . The mobile phone flash cover based on the three-dimensional stripe astigmatism of the present invention further improves the average uniformity and minimum uniformity of the flash illumination.

Further, the threaded astigmatism structure 3 includes at least four annular astigmatism stripes 12 arranged concentrically. The mobile phone flash cover based on the three-dimensional stripe astigmatism of the present invention further improves the average uniformity and minimum uniformity of the flash illumination.

The design method of the mobile phone flash cover of the present invention includes the following steps: A. Designing the structure of the mobile phone flash cover: the structure of the mobile phone flash cover includes a main body part 1 and an edge mounting part 2, and the edge mounting part 2 is located at the main body part 1. On the periphery, the first surface of the main body 1 is provided with two thread astigmatism structures 3 arranged side by side, the thread astigmatism structure 3 is provided with a central convex portion 11 and a plurality of astigmatism stripes 12, the astigmatism stripes 12 are arc-shaped, and the astigmatism stripes 12 and the center The convex parts 11 are arranged concentrically, the cross section of the astigmatism stripes 12 is an inverted V shape, and the top of the astigmatism stripes 12 is provided with a semicircular arc surface 13; The second surface of the main body part 1 is provided with a concave astigmatism surface 14;

B. Process the benchmark samples A1 and A2 respectively: in the benchmark sample A1, the astigmatism stripes 12 are divided into several regions, so that the height H of the astigmatism stripes 12 in several regions increases sequentially; the light concave surface in the benchmark sample A2 is divided into several regions , so that the radius of curvature R of the astigmatic concave surface 14 in several regions increases sequentially;

C. Use a flash tester to test A1 and A2: choose a 165-lumen LED as the light source, test the average uniformity, minimum uniformity, and maximum color temperature difference of the benchmark samples A1 and A2, and analyze the benchmark samples A1 and A2. The area of the height H of the astigmatism stripes 12 and the area of the radius of curvature R of the astigmatic concave surface 14 required by the uniformity, the minimum uniformity, and the maximum color temperature difference, so as to determine the height H of the astigmatism stripes 12 and the value of the radius of curvature R;

D. L2 is set to 1.71 mm, Y is determined to be 5, and the value of L1 is determined according to R/8.68=(Y-1)*L1+(L2-H)*X.

The design method of the mobile phone flash cover of the present invention can select the area of the height H of the astigmatism stripes 12 and the radius of curvature R of the astigmatic concave surface 14 that meet the requirements of average uniformity, minimum uniformity, and maximum color temperature difference through the sample full test. Therefore, according to the size limitation of the mobile phone flash cover based on the three-dimensional stripe astigmatism of the present invention, it is determined that L2 is set to 1.71mm, Y is set to 5, and then according to R/8.68=(Y-1)*L1+(L2- H)*X, determine the value of L1. The design method of the mobile phone flash cover of the present invention avoids the distortion caused by completely relying on the use of LightTools for lighting simulation test.

Further, the several areas are 6 areas. The design method of the mobile phone flash cover of the present invention is convenient for analysis.

To sum up, it can be seen that the present invention has the above-mentioned excellent characteristics, so that in use, it can improve the performance that is not available in the prior art, and has practicability, and becomes a product with great practical value.

The above contents are only preferred embodiments of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific embodiments and application scope. limits.

Claims (7)

1. Cell-phone flash of light lamp shade based on three-dimensional fringe astigmatism its characterized in that: the edge mounting part is positioned on the periphery of the main body part, two thread light scattering structures which are arranged in parallel are arranged on the first surface of the main body part, each thread light scattering structure is provided with a central convex surface part and a plurality of light scattering stripes, each light scattering stripe is arc-shaped, the light scattering stripes and the central convex surface parts are arranged concentrically, the cross section of each light scattering stripe is inverted V-shaped, and the top of each light scattering stripe is provided with a semi-arc surface; the height of the light scattering stripes is 7-10 times of the radius of the semi-circular arc surface.

2. The three-dimensional fringe astigmatism-based mobile phone flashlight cover of claim 1, wherein: the radius of the semi-circular arc surface is 0.01 mm-0.5 mm.

3. The three-dimensional fringe astigmatism-based mobile phone flashlight cover of claim 1, wherein: the second surface of the main body part is provided with an astigmatism concave part, and the relationship between the distance L1 between two adjacent astigmatism stripes, the height H of the astigmatism stripes, the curvature radius R of the astigmatism concave part, the light transmittance X of the main body part, the number Y of the astigmatism stripes of a single thread astigmatism structure and the minimum distance L2 between the upper vertex of the central convex part and the astigmatism concave part is R/8.68 ═ Y-1 ═ L1+ (L2-H) X.

4. The three-dimensional fringe astigmatism-based mobile phone flashlight cover of claim 3, wherein: the radius of the astigmatism concave part is 70-100 times of the height of the astigmatism stripe.

5. The three-dimensional fringe astigmatism-based mobile phone flashlight cover of claim 1, wherein: the thread light scattering structure at least comprises 4 concentrically arranged circular light scattering stripes.

6. The design method of the flash lampshade of the mobile phone is characterized by comprising the following steps of:

A. design cell-phone flash of light lamp shade's structure: the structure of the flashlight lampshade of the mobile phone comprises a main body part and an edge mounting part, wherein the edge mounting part is positioned on the periphery of the main body part, two threaded light scattering structures which are arranged in parallel are arranged on the first surface of the main body part, each threaded light scattering structure is provided with a central convex surface part and a plurality of light scattering stripes, each light scattering stripe is in an arc shape, the light scattering stripes and the central convex surface parts are arranged concentrically, the cross section of each light scattering stripe is in an inverted V shape, and the top of each light scattering stripe is provided with a; the height of the light scattering stripes is 7-10 times of the radius of the semi-circular arc surface; the second surface of the main body part is provided with an astigmatism concave part;

B. reference samples a1, a2 were processed separately: in the reference sample a1, the astigmatism fringes are divided into a plurality of regions so that the heights H of the astigmatism fringes in the plurality of regions are sequentially increased; the light concave portion in the reference sample a2 was divided into several regions such that the radii of curvature R of the light diffusing concave portions in the several regions were sequentially increased;

C. the flash tester was used to test a1, a 2: selecting an LED with 165 lumens as a light source, testing the average uniformity, the minimum uniformity and the maximum color temperature difference of the reference samples A1 and A2, and analyzing the area of the height H of the light scattering stripes and the area of the curvature radius R of the light scattering concave part in the reference samples A1 and A2, which meet the requirements of the average uniformity, the minimum uniformity and the maximum color temperature difference, so as to determine the height H of the light scattering stripes and the value of the curvature radius R;

D. l2 was set to 1.71mm, Y was determined to be 5, and the value of L1 was determined from R/8.68 ═ Y-1 × L1+ (L2-H) ×.

7. The design method of the flash lampshade of the mobile phone according to claim 6, characterized in that: the number of regions is 6 regions.

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