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Proceedings Paper

Generation of Olympic logo with freeform lens array
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Paper Abstract

In this paper, the Olympic rings pattern is generated by using freeform lens array and illumination light source array. Based on nonimaging optics, the freeform lens array is designed for point light source, which can generate the focused pattern of annular light spot. In order to obtain the Olympic logo pattern of five rings, the array with five freeform lenses is used. By adjusting the emission angle of each light source, the annular spot is obtained at different positions of the target plane and the Olympic rings logo is formed. We used the shading plate on the surface of the freeform lens to reduce the local light intensity so that the light spot overall irradiance distribution is more uniform. We designed a freeform lens with aperture of 26.2mm, focal length of 2000mm and the diameter of a single annual spot is 400mm. We modeled freeform lens and simulated by optical software TracePro. The ray tracing results show that the Olympic rings with uniform illumination can be obtained on the target plane with the optical efficiency up to 85.7%. At the same time, this paper also studies the effects of the target plane defocusing on the spot pattern. Simulations show that when the distance of the receiving surface to the focal plane varies within 300mm, a reasonable uniform and small distorted light spot pattern can be obtained. Compared with the traditional projection method, our method of design has the advantages of high optical efficiency, low cost and the pattern is clear and uniform.

Paper Details

Date Published: 24 October 2017
PDF: 6 pages
Proc. SPIE 10459, AOPC 2017: Optical Storage and Display Technology, 104590X (24 October 2017); doi: 10.1117/12.2285366
Show Author Affiliations
Chengkun Liu, Fujian Normal Univ. (China)
Qilu Huang, Quanzhou Normal Univ. (China)
Univ. of Science and Technology of China (China)
Yishen Qiu, Fujian Normal Univ. (China)
Weijuan Chen, Fujian Normal Univ. (China)
Tingdi Liao, Quanzhou Normal Univ. (China)

Published in SPIE Proceedings Vol. 10459:
AOPC 2017: Optical Storage and Display Technology
Byoungho Lee; Yongtian Wang; Xiaodi Tan; Xiangping Li, Editor(s)

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