Abstract
The use of an optical plate to enhance light efficiency of LED systems was suggested. The optical plate technology indicates that polymeric optical plates having optical patterns on themselves are placed on LED systems. We designed and manufactured an optical plate that enhance light efficiency, and verified its optical characteristics in this study. The shape and the size of the spherical lens patterns were designed based on the lens formula including the refraction indices of air and PMMA, thickness of the optical component and the optical distance. To manufacture the optical plate having the designed spherical lens patterns, a metal mold was machined by ultra-fine punching machining technology. Using the ultra-fine punching machining system, spherical lens patterns with 0.45 mm in height, 1.15 mm in diameter were successfully machined on the top of a mold of 90 * 60 mm2 size. Using the machined mold and transparent PMMA, an optical plate with the spherical lens patterns was molded by injection molding technology. The optical plate was placed on the LED system, and the luminance was measured with and without the optical plate, and as a result the average and the maximum intensity increased by 1.4 times and 1.3 times respectively.
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Abbreviations
- n:
-
refractive index
- f:
-
focal length
- d:
-
thickness of a medium
- R:
-
radius of the spherical lens
References
Jeon, E. C., Je, T. J., Lee, E. S., Park, E. S., Lee, J. R., et al., “Optimization of Hybrid LED Package System for Energy Saving based on Micro Machining Technology and Taguchi Method,” Int. J. Precis. Eng. Manuf., vol. 14, no. 6, pp. 1113–1116, 2013.
Je, T. J., Park, S. C., Lee, K. W., Noh, J. S., Choi, D. S., et al., “Influence upon Machining Accuracy of Micro-pattern Roll Mold Processed by Temperature Variation,” Transactions of Materials Processing, vol. 18, no. 2, pp. 107–111, 2009.
Chen, H. C., Lin, J. Y., Chiu, H. Y., “Rectangular Illumination using a Secondary Optics with Cylindrical Lens for LED Street Light,” Optics Express, vol. 21, no. 3, pp. 3201–3212, 2013
Lee, Y. M., Lee, J. H., and Jeon, E. c., “A Study on an Integrated Light Guide Plate,” Korean Journal of Optics and Photonics, vol. 21, no. 2, pp. 53–60, 2010.
Mao, X., Li, H., Han, Y., Luo, Y., “A Two-step Design Method for High Compact Rotationally Symmetric Optical System for LED Surface Light Source,” Optics Express, vol. 22, no. 102, pp. A233–A247, 2014.
Davenport, T., Design Consideration for Enhancing LED Efficiency(MAGAZINE), http://www.ledsmagazine.com/articles/print/volume-9/issue-10/features/design-considerations-for-enhancing-ledefficiency-magazine.html (Accessed 28 MAY 2015)
Fang, F., Zhang, X., Weckenmann, A., Zhang, G., and Evans, C., “Manufacturing and Measurement of Freeform Optics,” CIRP Annals-Manufacturing Technology, vol. 62, no. 2, pp. 823–846, 2013.
Shih, C. J., Lin, W. C., Lin, C. S., Ou, S. F., and Pan, Y. N., “Fabrication of Diamond Conditioners by using a Micro Patterning and Electroforming Approach,” Microelectronic Engineering, vol. 103, pp. 92–98, 2013.
Jeong, S. M., Kissinger, S., Kim, D. W., Lee, S. J., Kim, J. S., et al., “Characteristic Enhancement of the Blue LED Chip by the Growth and Fabrication on Patterned Sapphire (0 0 0 1) Substrate,” Journal of Crystal Growth, vol. 312, no. 2, pp. 258–262, 2010.
Cheng, D. W., Wang, Y., Hua, H., and Talha, M. M., “Design of an Optical Seethrough Head-mounted Display with a Low f-number and Large Field of View using a Freeform Prism,” Applied Optics, vol. 48, no. 14, pp. 2655–2668, 2009.
Gao, W., Araki, T., Kiyono, S., Okazaki, Y., and Yamanaka, M., “Precision Nanofabrication and Evaluation of a Large Area Sinusoidal Grid Surface for a Surface Encoder,” Precision Engineering, vol. 27, no. 3, pp. 289–298, 2003.
Dannberg, P., Mann, G., Wagner, L., and Brauer, A., “Polymer UVmoulding for Micro-optical Systems and O/E-integration,” Proc. of SPIE, vol. 4179, pp. 137–145, 2000.
Noh, Y. J., Arai, Y., Tano, M., and Gao, W., “Fabrication of Largearea Micro-lens Arrays with Fast Tool Control,” Int. J. Precis. Eng. Manuf., vol. 9, no. 4, pp. 32–38, 2008.
Fang, F. and Venkatesh, V., “Diamond Cutting of Silicon with Nanometric Finish,” CIRP Annals-Manufacturing Technology, vol. 47, no. 1, pp. 45–49, 1998.
Luo, Y., Feng, Z., Han, Y., and Li, H., “Design of Compact and Smooth Free-Form Optical System with Uniform Illuminance for Led Source,” Optics Express, vol. 18, no. 9, pp. 9055–9063, 2010.
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Lee, JR., Jeon, Ec., Kim, H. et al. Optical characterization and manufacturing of an optical plate for increasing light efficiency of LED systems. Int. J. Precis. Eng. Manuf. 16, 1355–1360 (2015). https://doi.org/10.1007/s12541-015-0178-y
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DOI: https://doi.org/10.1007/s12541-015-0178-y