发明名称 |
Multiple-beam holographic optical pick-up head |
摘要 |
The present invention discloses a multiple-beam holographic optical pick-up head, which has the advantages of the multiple-beam optical pick-up head and the holographic optical pick-up head and can increase the light usage efficiency. This invention uses the property that a polarized diffractive optical element can generate different optical effects for laser beam with different polarizations and places a polarized multiple-beam grating and polarized hologram on the optical path for splitting the incident light toward the disc into multiple reading beams by the multiple-beam grating. The returning laser beams reflected from the disc are diffracted and diverted by the hologram to reach a photodetector. Both the incident and reflective beams are diffracted once only; thus the light usage efficiency can be increased.
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申请公布号 |
US6369377(B1) |
申请公布日期 |
2002.04.09 |
申请号 |
US20000615412 |
申请日期 |
2000.07.13 |
申请人 |
INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE |
发明人 |
SHIH HSI-FU;JU JAU-JIU;YANG TZU-PING;LU WEI-CHIH;FREEMAN MARK O.;HUANG DER-RAY;YANG CARL Y. |
分类号 |
G11B7/135;G11B7/14;(IPC1-7):G11B7/00 |
主分类号 |
G11B7/135 |
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