Lens assembly with high uniform rectangular focused halo and method of adjusting halo size using the same

A method of adjusting a halo size of a lens assembly with a high uniform rectangular focused halo, comprising the following steps:

• providing the lens assembly with a high uniform rectangular focused halo;
• wherein the lens assembly with a high uniform rectangular focused halo, comprising:
• a first lens and an adjacent second lens, wherein,
• the first lens includes a first incident surface, a first non-spherical surface, and a first convex array emitting surface, and
• the second lens includes a second concave array incident surface and a second non-spherical surface emitting surface;
• wherein the second concave array incident surface consists of multiple non-spherical concave arrays having rectangular openings corresponding to the first convex array emitting surface;
• adjusting parameters of the lens assembly with a high uniform rectangular focused halo based on the following formulas (1) and (2);
• and
• directing a light source L from the light source focus on the first incident surface to enter into the first incident surface and being collimated by the first lens, emitting from the first convex array emitting surface and entering into the second concave array incident surface to be split, and finally focusing on a projection plane through the second non-spherical emitting surface to create a size adjustable rectangular focused halo;
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• Formula
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• Formula
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• wherein, in formulas (1) and (2):
• r1 is the curvature radius of each non-spherical convex array having the rectangular openings in the first convex array emitting surface;
• r2 is the curvature radius of each non-spherical concave array having the rectangular openings in the second concave array incident surface;
• r3 is the curvature radius of the second non-spherical emitting surface;
• the distance between the first lens and the second lens is twice r1;
• the distance between the rectangular focused halo position and the second non-spherical emitting surface is twice r3;
• aw and ah are the length and width of each non-spherical array having the rectangular openings in the first convex array emitting surface and the second concave array incident surface, respectively;
• and
• w and h are the obtained dimensions of the rectangular focused halo, respectively.