发明名称 |
Apparatus with multiple heads adjusted for optimum performance at different regions of optical disk |
摘要 |
An optical disk apparatus effect recording reproduction and erasure of information by irradiation with laser beams on an optical disk. In the optical disk apparatus, a plurality of beam heads are correspondingly provided for respective recording regions defined by radially dividing a recording zone on the optical disk.
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申请公布号 |
US4998238(A) |
申请公布日期 |
1991.03.05 |
申请号 |
US19890427959 |
申请日期 |
1989.10.25 |
申请人 |
NIKON CORPORATION |
发明人 |
MIZUNOE, KATSUMI;KANEKO, HISHARU |
分类号 |
G11B7/12;G11B7/00;G11B7/004;G11B7/0045;G11B7/0055 |
主分类号 |
G11B7/12 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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