标题: | 以扩散片消除雷射微型投影机之光斑效应研究 The research for speckle reduction of the laser pico-projector by the diffuser |
作者: | 施济濠 Shih, Chi-Hao 潘瑞文 Pan, Jui-Wen 影像与生医光电研究所 |
关键字: | 光学系统设计;光斑;照明设计;雷射二极体;Optical systems design;Speckle;Illuminaiton design;Diode lasers |
公开日期: | 2013 |
摘要: | 在本论文中,我们提出一个具有低光斑对比值、高对比度并同时维持系统效率的微型雷射投影机。消除光斑对比度值的方法为采用两片扩散片与一个音圈马达震荡器。随着不同种类的第二扩散片,我们可以分成两大类。在第一类里,光斑对比值可以藉由圆对称扩散片降低到2.8%。同时FO:FO对比度可以维持在1200:1~1300:1,系统效率减少1.5%。在第二类里,光斑对比度值可以藉由椭圆对称扩散片下降到6.49%。同时FO:FO对比度可以维持1300:1~1400:1,系统效率只减少1% We proposed a LASER pico-projector of low speckle contrast value, high contrast ratio, and system efficiency maintained. The method of speckle contrast value reduction adopted two pieces of diffusers and a Voice Coil Motor (VCM) oscillator. With the different second diffusers for high contrast ratio and high system efficiency, we can divide into two categories. In the category 1, the speckle contrast value can be decreased to 2.8% by circular symmetric diffuser. In the meantime, the full-on/full-off (FO:FO) contrast ratio can be maintained 1200:1~1300:1, and the system efficiency decreases 1.5%. In the category 2, the speckle contrast value can be reduced to 6.495% with the elliptical symmetric diffuser. At the same time, the FO:FO contrast ratio can be maintained 1300:1~1400:1, and the system efficiency decreases only 1%. |
URI: | http://140.113.39.130/cdrfb3/record/nctu/#GT070058222 http://hdl.handle.net/11536/73958 |
显示于类别: | Thesis |