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发明名称
OPTICAL SYSTEM FOR DETECTING POSITION DISPLACEMENT OF OBJECTIVE LENS OF OPTICAL PICKUP
摘要
申请公布号
JPH01144223(A)
申请公布日期
1989.06.06
申请号
JP19870303955
申请日期
1987.12.01
申请人
HITACHI ELECTRON ENG CO LTD
发明人
KUMAI HIROAKI
分类号
G11B7/085
主分类号
G11B7/085
代理机构
代理人
主权项
地址
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