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Title: Objective lens, optical pickup head and compact disc reading-writing device compatible with reading and writing of blue-ray disc (BD) and China blue high-definition disc (CBHD)
Other Titles: 兼容BD和CBHD读写的物镜、光学头以及光盘读写装置
Authors: Li, RB 
Du, X 
Li, LH 
Wang, WK 
Issue Date: 31-Dec-2014
Publisher: 中华人民共和国国家知识产权局
Source: 中国专利 ZL 201110064373.1 How to cite?
Abstract: The invention relates to an objective lens compatible with the reading and writing of a blue-ray disc (BD) and a China blue high-definition disc (CBHD). The objective lens comprises an incident surface and an emergent surface, wherein the incident surface is a free curved surface; and the emergent surface is a flat aspheric surface. Parallel laser beams sequentially pass through the incident surface and the emergent surface, and form diffraction limit-level focal spots on a BD information layer and a CBHD information layer. The invention also relates to an optical pickup head and a compact disc reading-writing device, which are compatible with the reading and writing of the BD and the CBHD. According to the objective lens, the optical pickup head and the compact disc reading-writing device compatible with the reading and writing of the BD and the CBHD, a free curved surface technology is adopted, and the working distance of the objective lens is prolonged, so that requirements for the assembly accuracy of the objective lens are lowered, the objective lens is high in yield and low in cost, and the numerical aperture of the objective lens is not required to be manually regulated.
Rights: 专利权人: The Hong Kong Polytechnic University.
Appears in Collections:Patent

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