Articles

Investigation of the influence of structural parameters of a Fresnel-type lens on the narrowing of light-emitting diode light beams

[+] Author Affiliations
Chi-Chang Hsieh

National Kaohsiung First University of Science and Technology, Department of Mechanical and Automation Engineering, Kaohsiung 811, Taiwan

Pa-Yee Tsai

Quan Shen Machinery Industry Co., Ltd., Zhongshan City 528458, Guangdong, China

Yan-Huei Li

National Sun Yat-sen University, Department of Mechanical and Electro-Mechanical Engineering, Kaohsiung 811, Taiwan

Cheng-Wen Fan

Industrial Technology Research Institute, Department of Materials Integrity Research, Hsinchu 310, Taiwan

J. Micro/Nanolith. MEMS MOEMS. 10(3), 033005 (August 12, 2011). doi:10.1117/1.3606577
History: Received February 10, 2011; Revised June 03, 2011; Accepted June 13, 2011; Published August 12, 2011; Online August 12, 2011
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In this study, an influence of the structural parameters of a three-dimensional (3D)-Fresnel-based lens which was designed as a primary optic on the narrowing of light-emitting diode (LED) light beams has been investigated and proposed to gather the emitted light into a narrow-angle light beam. Most conventional LEDs are not able to create a narrow-angle light beam without using a reflector cup or secondary optics, because the LED lighting angle is usually wide (±30 deg from the centerline of the light source). Nevertheless, the energy of the LED light within the range ±16 deg from the centerline of the light source can be greatly enhanced by the focusing effect of a 3D-Fresnel-based lens design as shown in this study. The illumination and the luminous flux of the LED light beam in comparison with the conventional LED have been respectively enhanced up to 61% and 20% respectively. The main contribution of this study is to adjust the height/width ratio of the ladder-shaped structure of a 3D-Fresnel–based lens in order to focus the LED light into a stronger beam, and to meet some specific working circumstances.

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© 2011 Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation

Chi-Chang Hsieh ; Pa-Yee Tsai ; Yan-Huei Li and Cheng-Wen Fan
"Investigation of the influence of structural parameters of a Fresnel-type lens on the narrowing of light-emitting diode light beams", J. Micro/Nanolith. MEMS MOEMS. 10(3), 033005 (August 12, 2011). ; http://dx.doi.org/10.1117/1.3606577


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