发明授权
US5708638A Device for optically scanning a recording medium by focusing the best
focus or the paraxial focus to the information layer
失效
用于通过将最佳聚焦或近轴聚焦聚焦到信息层来光学扫描记录介质的装置
- 专利标题： Device for optically scanning a recording medium by focusing the best focus or the paraxial focus to the information layer
- 专利标题（中）： 用于通过将最佳聚焦或近轴聚焦聚焦到信息层来光学扫描记录介质的装置
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申请号： US615931申请日： 1996-03-14
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公开(公告)号： US5708638A公开(公告)日： 1998-01-13
- 发明人: Josephus J. M. Braat , Igolt P. D. Ubbens , James H. Coombs , Jacob Sonneveld , Jacobus P. C. Kroon , Petrus T. Jutte
- 申请人： Josephus J. M. Braat , Igolt P. D. Ubbens , James H. Coombs , Jacob Sonneveld , Jacobus P. C. Kroon , Petrus T. Jutte
- 申请人地址： NY New York
- 专利权人： U.S. Philips Corporation
- 当前专利权人： U.S. Philips Corporation
- 当前专利权人地址： NY New York
- 优先权： EPX95200619 19950315
- 主分类号： H04N5/783
- IPC分类号： H04N5/783 ; G11B5/008 ; G11B5/027 ; G11B7/00 ; G11B7/0037 ; G11B7/085 ; G11B7/09 ; G11B7/131 ; G11B7/133 ; G11B7/1353 ; G11B7/1372 ; G11B7/1381 ; G11B15/02 ; G11B15/12 ; G11B15/14 ; G11B15/18 ; G11B15/473 ; G11B19/12 ; G11B20/02 ; G11B27/032 ; G11B27/036 ; G11B27/36 ; G11B33/10
摘要：
An optical scanning device can scan two types of record carriers each having a transparent layer with a different thickness, in which a radiation beam scans an information layer of the record carrier through the transparent layer. When scanning a first type of record carrier the best focus of a scanning radiation beam is positioned on the information layer and when scanning a second type of record carrier the paraxial focus of the radiation beam is positioned on the information layer.
公开/授权文献
- US5144651A Reduced time remote access method and system 公开/授权日：1992-09-01
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