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http://dx.doi.org/10.7735/ksmte.2017.26.3.328

Analysis of Performance on Asymmetric LED Lens Design Using Three-Dimensional Free-Form Surface Expression  

Lee, Chang Soo (Graduate School of Knowledge-based Technology & Energy (Opto-Nanotronics), Korea Polytechnic University)
Lee, Soo Young (Graduate School of Knowledge-based Technology & Energy (Opto-Nanotronics), Korea Polytechnic University)
Hyun, Dong Hoon (Graduate School of Knowledge-based Technology & Energy (Opto-Nanotronics), Korea Polytechnic University)
Publication Information
Journal of the Korean Society of Manufacturing Technology Engineers / v.26, no.3, 2017 , pp. 328-336 More about this Journal
Abstract
The exit surface of a lens is designed using a three-dimensional free-form expression in order to easily modify a curved surface. This enables the design of numerical values and mathematical things using three-dimensional free-form expression, and enhances precision because it can be fine-tuned via numerical control. The standard of "Classification of Luminaire Light Distribution" for outdoor lighting fixtures by IESNA is adopted in order to examine the correlation between three-dimensional free-form surface expression and lighting performance. The variation of light distribution type and range is analyzed using the values of maximum light intensity and 50% light intensity. The actual tolerance occurs owing to parameters such as the thickness of the lens, the distance between LEDs, and the movement of the center of the incident surface; the effects of changes in these parameters on the performance are compared and analyzed.
Keywords
LED; Lens; Free-form surface; IESNA; LCS; Asymmetric;
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