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Deign method of light-type controllable lens with double freeform surfaces

A technology of a curved lens and a design method, which is used in applications to meet different lighting needs, the design of double free-form curved lenses, and the field of beam control in LED packaging, which can solve the problems of losing the degree of freedom of lens design and the inability to adjust the shape of the lens at will.

Active Publication Date: 2014-08-27
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the light emitted from the LED reaches the irradiated surface, it will pass through the inner and outer surfaces of the lens in turn, and refraction occurs twice. In the traditional design method, the inner surface of the lens is directly assumed to be hemispherical, which will lose an important degree of freedom in lens design, and the shape of the lens cannot be based on Apply any adjustments

Method used

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  • Deign method of light-type controllable lens with double freeform surfaces
  • Deign method of light-type controllable lens with double freeform surfaces
  • Deign method of light-type controllable lens with double freeform surfaces

Examples

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example 1

[0046] Referring to FIG. 5(1), this embodiment relates to a rotationally symmetrical double free-form surface lens whose inner surface is cylindrical and outer surface is a free-form surface. The material of double freeform surface lens is PC (polycarbonate) in the present embodiment, and inner surface height is 1 millimeter, and outer surface height is 4 millimeters, and the function relation of given inner surface is 1=x 2 +y 2 (0≤z≤1), that is, a cylinder with a height of 1 mm and a radius of 1 mm, where (x, y, z) represents the coordinates of a point on the inner surface of the double free-form surface lens in the X-Y-Z three-dimensional space. Referring to Fig. 2(1), the target surface is a circular surface with a radius of 100mm, divided according to Fig. 2(1), N is 200, M is 300, and the distance from the light source to the target surface is 50mm. Referring to FIG. 5(2), it is a diagram of the illuminance distribution of the double free-form surface lens on the target...

example 2

[0048] Referring to FIG. 6(1), this embodiment relates to a rotationally symmetrical double free-form surface lens whose outer surface is cylindrical and whose inner surface is a free-form surface. The material of double free-form surface lens is PMMA (polymethyl methacrylate) in the present embodiment, and inner surface height is 2 millimeters, and outer surface height is 4 millimeters, and the function relation of given outer surface is 4=x 2 +y2 (0≤z≤4), that is, a cylinder with a height of 4 mm and a radius of 2 mm, where (x, y, z) represents the coordinates of a point on the outer surface of the double free-form surface lens in the X-Y-Z three-dimensional space. Referring to Fig. 2(1), the target surface is a circular surface with a radius of 200mm, divided according to Fig. 2(1), N is 500, M is 800, and the distance from the light source to the target surface is 100mm. Referring to FIG. 6(2), it is a diagram of the illuminance distribution of the double free-form surface...

example 3

[0050] Referring to FIG. 7(1), this embodiment relates to a rotationally symmetrical double free-form surface lens whose inner surface is hemispherical and outer surface is a free-form surface. The material of double free-form surface lens is PP (polymethyl methacrylate) in the present embodiment, and inner surface height is 1 millimeter, and outer surface height is 3 millimeters, and the function relation of given inner surface is z=(1-x 2 -y 2 ) 0.5 , which is a hemispherical surface with a radius of 1 mm, where (x, y, z) represents the coordinates of a point on the inner surface of the double free-form surface lens in the X-Y-Z three-dimensional space. Referring to Fig. 2(1), the target surface is a circular surface with a radius of 100mm, divided according to Fig. 2(1), N is 500, M is 500, and the distance from the light source to the target surface is 50mm. Referring to FIG. 7(2), it is a diagram of the illuminance distribution of the double free-form surface lens on th...

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Abstract

The invention discloses a deign method of a light-type controllable lens with double freeform surfaces. The method comprises the following steps of: taking a light source as an origin of coordinates according to an energy equal division principle to divide a three-dimensional space of the light source into gridding graphs according to latitudes and longitudes, wherein the gridding graphs have the equal luminous fluxes and the latitudes and the longitudes are crossed; dividing a target surface into grid regions with equal areas and equal luminous fluxes; and distributing two times of deflection angles of lights on inner and outer surfaces of the lens with the double freeform surfaces according to the symmetrical characteristic of the target surface of the lens with the double freeform surfaces to be designed and a pre-set function relation between the inner and outer surfaces or through a direction of incidence lights of the lens and a direction of final outgoing lights, which are obtained by dividing the light source and the target surface, and then designing. The inner and outer surfaces of the lens with the double freeform surfaces can be designed into different shapes which are applicable to different packaging requirements; the control of light beams is realized through the inner and outer surfaces, thereby meeting various different illumination requirements and realizing various different illumination effects.

Description

technical field [0001] The invention belongs to the LED packaging technology, and relates to a design method of a double free-form surface lens with controllable light beams in the LED packaging, and is particularly applied in the LED packaging to realize light beam control and meet different lighting requirements. Background technique [0002] LED (Light Emitting Diode) is a semiconductor light-emitting device based on the principle of P-N junction electroluminescence. It has the advantages of high electro-optic conversion efficiency, long service life, environmental protection and energy saving, and small size. It is known as the 21st century green lighting source. If it can be applied to the field of traditional lighting, it will have a very significant energy-saving effect, which is of great significance in today's increasingly tense global energy sources. With the breakthrough of the third-generation semiconductor material technology represented by nitrides, the semicon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B3/00F21V5/04F21Y101/02F21Y115/10
Inventor 罗小兵胡润王恺甘志强刘胜
Owner HUAZHONG UNIV OF SCI & TECH
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