Design method of free-form lens capable of realizing rotational and symmetrical three-dimensional light intensity distribution
A technology of light intensity distribution and curved lens, applied in the directions of lenses, optics, optical components, etc., can solve problems such as reducing the efficiency of optical design, and achieve the effect of improving design efficiency
Pending Publication Date: 2018-01-09
SOUTH CHINA UNIV OF TECH
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However, the light intensity distribution on the two-dimensional design is often different from the light intensity distribution on the three-dimensional design, which requires tedious iterative feedback optimization in the two-dimensional design process to achieve a specific rotationally symmetrical light intensity distribution in three dimensions , which greatly reduces the optical design efficiency
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[0036] The implementation of the present invention will be further described below in conjunction with the accompanying drawings and examples, but the implementation and protection of the present invention are not limited thereto.
[0037] In this example, it is assumed that the light intensity in three dimensions is uniformly distributed, expressed as:
[0038] I 3D (β)=K, -35°≤β≤35°
[0039] First, consider a lossless optical system in two dimensions, such as Figure 1a As shown, the energy emitted by the light source is equal to the total energy of the outgoing light after passing through the lens, then:
[0040]
[0041] in, and Indicates the exit angle and maximum exit angle of light source rays, β and β max Indicates the exit angle and maximum exit angle of the light after the light passes through the lens. L 2D and D are the illuminance and diameter of a two-dimensional LED extended light source immersed in a lens material with a refractive index n. I 2D (β...
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The invention discloses a design method of a free-form lens capable of realizing rotational and symmetrical three-dimensional light intensity distribution. According to the LED extended light source oriented free-form lens for rapid realization of illumination with uniform light intensity distribution, firstly, a two-dimensional lossless optical system is considered, the energy emitted by a lightsource is equal to the total energy of emitted light through the lens, a lens physical body is obtained through rotation of two-dimensional lens contour lines, a relation between the light intensity distribution and a two-dimensional design process in the three dimension is obtained through a three-dimensional conversion function, the two-dimensional light intensity distribution is corrected through the relation, the lens physical body formed through rotational symmetry of the two-dimensional lens contour lines obtained through calculation can rapidly realize illumination with specific light intensity distribution, and a complicated iteration feedback optimization process is omitted. According to the method, the light emitted by the LED extended light source forms illumination with uniformlight intensity distribution in the space through the free-form lens, complicated feedback iteration optimization can be avoided, and the design efficiency is greatly improved.
Description
technical field [0001] The invention relates to the field of optical devices, in particular to a free-form surface lens used for LED extended light sources to quickly realize specific rotationally symmetrical three-dimensional light intensity distribution. Background technique [0002] As a new generation of light source, LED has the advantages of long life, low power, and compact structure, and is widely used in different lighting places, and gradually replaces traditional light sources. The free-form surface lens design method for LED point light sources has gradually matured and improved. However, with the demand for high-power LED light sources, multiple LED chip arrays are required to be integrated and packaged on the substrate to achieve high-power output. The traditional LED point light source lens design method has been difficult to apply in the LED extended light source. For LED extended light sources, in order to achieve a specific light intensity distribution in...
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IPC IPC(8): G02B27/00G02B3/00G02B3/02
Inventor 葛鹏王洪李秀丰
Owner SOUTH CHINA UNIV OF TECH