发明名称 |
Holographic optical element, position shift detecting apparatus, optical pickup apparatus, optical recording medium drive and method of fabricating holographic optical element |
摘要 |
In a holographic pattern provided in a holographic optical element, a pattern 1a twists a diffracted light beam in a clockwise direction, to form a semi-circular light spot Sa on photodetection parts A and B so as to extend over a dividing line LX in a four-segment photodetection part. A pattern 1b similarly twists the diffracted light beam in a clockwise direction, to form a semi-circular light spot Sb on photodetection parts C and D so as to extend over a dividing line LX in the four-segment photodetection part.
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申请公布号 |
US2003067640(A1) |
申请公布日期 |
2003.04.10 |
申请号 |
US20020237170 |
申请日期 |
2002.09.09 |
申请人 |
MORI KAZUSHI;MATSUMOTO MITSUAKI;TOMINAGA KOJI;TAJIRI ATSUSHI;SAWADA MINORU |
发明人 |
MORI KAZUSHI;MATSUMOTO MITSUAKI;TOMINAGA KOJI;TAJIRI ATSUSHI;SAWADA MINORU |
分类号 |
G02B5/32;G03H1/04;G11B7/09;G11B7/13;G11B7/135;G11B7/22;(IPC1-7):G02B5/32 |
主分类号 |
G02B5/32 |
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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