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Title: Lens used for improving diffraction efficiency of blue-ray disc and China high definition disc
Other Titles: 一种用于增强蓝光光盘和中国高清光盘衍射效率的透镜
Authors: Li, RB 
To, S 
Li, LH 
Wan, WK 
Issue Date: 30-May-2012
Publisher: 中华人民共和国国家知识产权局
Source: 中国专利 ZL 201120335419.7 How to cite?
Abstract: The utility model relates to a lens used for improving the diffraction efficiency of a blue-ray disc and a China high definition disc, which comprises a first lens surface (1) and a second lens surface (2), wherein the first lens surface is a free curved surface, and the second lens surface is an aspheric surface; the first lens surface and the second lens surface are used for focusing incident light into a focal zone; and the focal zone comprises an information recording layer (31) focused on the blue-ray disc, and an information recording layer (41) focused on the China high definition disc. Due to a phase control structure, the diffraction efficiency of the lens corresponding to the blue-ray disc and the China high definition disc can be improved, the energy loss is reduced, and the stray light is improved.
Rights: 专利权人: The Hong Kong Polytechnic University.
Appears in Collections:Patent

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