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发明名称
RADIATION REFLECTION TYPE RECORD CARRRIER READER
摘要
An apparatus is described for reading a record carrier with an optical information structure, in which apparatus errors in the focussing of a read beam on the information plane are detected with an astigmatic focussing-error detection system.
申请公布号
JPS53117404(A)
申请公布日期
1978.10.13
申请号
JP19780031828
申请日期
1978.03.22
申请人
PHILIPS NV
发明人
HEIBERUTASU BOUFUISU
分类号
G02B7/38;G02B7/28;G11B7/09
主分类号
G02B7/38
代理机构
代理人
主权项
地址
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