Single objective lens for use with CD or DVD optical disk

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	Single objective lens for use with CD or DVD optical disk
其他题名	Single objective lens for use with CD or DVD optical disk
	BROOME, BARRY G.; RICHARD, JENKIN A.
	2013-07-30
专利权人	KONICA CORPORATION
公开日期	2013-07-30
授权国家	美国
专利类型	授权发明
摘要	An optical disk reader or read/write system for CD or DVD formats. First and second laser diodes operating at different wavelengths have their output beams collimated and directed at a single element objective lens, and are then reflected off the disk back through the lens to a photodetector. The single element objective lens has a central aperture zone and an outer aperture zone, the central zone being profiled to operate at a first numerical aperture at approximately 0.45 and the output beam of the first laser diode is confined to the central aperture zone. The outer aperture zone together with the central aperture zone are profiled to operate at a second numerical aperture, for example 0.60 wherein the output beam of the second laser diode has ray fans extending across the full aperture of the single element objective lens. A diffractive is formed on one surface of the single element objective lens and provides sufficient aspheric surface power for spherical aberration correction as well as correction for spherochromatism. The diffractive also provides sufficient correction for spherical aberration and spherochromatism that the single element objective lens achieves diffraction-limited image quality for both CD and DVD formats.
其他摘要	用于CD或DVD格式的光盘读取器或读/写系统。工作在不同波长的第一和第二激光二极管的输出光束被准直并指向单个元件物镜，然后通过透镜从光盘反射回光电探测器。单元件物镜具有中心孔区和外孔区，中心区被成形为在约0.45的第一数值孔处操作，并且第一激光二极管的输出光束被限制在中心孔区。外开口区域与中心开口区域一起被成形为在第二数值孔径（例如0.60）下操作，其中第二激光二极管的输出光束具有在单个元件物镜的整个孔径上延伸的射线扇。在单个元件物镜的一个表面上形成衍射，并提供足够的非球面表面功率用于球面像差校正以及校正球面色度。衍射还对球面像差和球面色度提供了足够的校正，使得单元件物镜实现了CD和DVD格式的衍射限制图像质量。
申请日期	2008-04-10
专利号	USR44397
专利状态	失效
申请号	US12/100854
公开（公告）号	USR44397
IPC 分类号	G11B7/135 \| G11B7/00 \| G11B7/125
专利代理人	-
代理机构	FINNEGAN, HENDERSON, FARABOW, GARRETT & DUNNER, L.L.P.
文献类型	专利
条目标识符	http://ir.opt.ac.cn/handle/181661/32707
专题	半导体激光器专利数据库
作者单位	KONICA CORPORATION
推荐引用方式 GB/T 7714	BROOME, BARRY G.,RICHARD, JENKIN A.. Single objective lens for use with CD or DVD optical disk. USR44397[P]. 2013-07-30.

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