A Lens Design Method for Square Uniform Light Spot

Abstract

The invention discloses a method for designing a lens with a uniform square light spot. The method comprises the following steps of: firstly dividing the square light spot into eight centrosymmetric areas along an axis of symmetry, and partitioning one of the eight centrosymmetric areas into n (n is larger than or equal to 2) angular areas, wherein the difference of the lengths of two angle edgesof each angular area is constant; respectively taking one plane formed by one angular edge passing through each angular area and an optical axis as an incidence surface, partitioning a luminous area of a light source on the incidence surface arranged on one side of the optical axis into a plurality of small angles according to luminous intensity along a distribution rule of luminous angles so as to make the luminous fluxes of lights distributed in each small angle equal, partitioning the angular edge of each incidence surface into a plurality of small sections one-to-one corresponding to the small angles, sequentially obtaining the shapes of the sections of a lens on a first surface and a second surface of each incidence surface according to a refraction law, and respectively rotating thesections of the lens around the optical shaft in an angular area, wherein the optical shaft is arranged in the angular area, and a rotation angle is equal to the angle of the angular area; and obtaining the octant shape of the lens; and obtaining the whole shape of the lens according to a centrosymmetry raw. The method disclosed by the invention is simple, visualized and flexible.

Description

technical field

[0001] The invention relates to a design method of an optical element, more specifically, to a design method of a lens whose illuminated surface is a square uniform light spot. Background technique

[0002] When LEDs are used in engineering lighting, different lenses are often designed for light distribution according to different usage occasions or customer requirements. In some places of use, such as underground garages, squares, etc., it is usually not desirable to use too many lamps, but it is hoped that the illumination can be uniform. If the illuminated surface is circular, elliptical and other light spot shapes, without increasing the number of lamps, there will inevitably be dark areas and blind spots at the junction of adjacent lamps, which will make the illumination of the illuminated surface uneven. Therefore, it is difficult to meet the requirements of customers. In order to achieve uniform illumination of the illuminated area with fewer lamps, ...

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