发明名称 |
Optical pickup apparatus |
摘要 |
An optical pickup apparatus for reading out information from an optical disk. The optical pickup includes a light source; and an optical device having a grating pattern for splitting a light beam from said the source into a zero-order diffracted beam and plus and minus first-order diffracted beams. The grating pattern has the center portion and one or more side portions. The efficiency of the center portion for the zero-order diffracted beam is greater than the efficiency of the side portions for the zero-order diffracted beam.
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申请公布号 |
US5410529(A) |
申请公布日期 |
1995.04.25 |
申请号 |
US19930026177 |
申请日期 |
1993.03.01 |
申请人 |
SHARP KABUSHIKI KAISHA |
发明人 |
KURATA, YUKIO;NISHITANI, YUKINORI;YOSHIDA, YOSHIO;MIYAKE, TAKAHIRO |
分类号 |
G02B5/18;G11B7/12;G11B7/135;(IPC1-7):G11B7/135 |
主分类号 |
G02B5/18 |
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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