发明名称 |
Optical head with built-in semiconductor laser, objective lens and +E,fra 1/4+EE wavelength plate |
摘要 |
An optical head has a semiconductor laser for emitting light, a collimator lens for converting the light from the laser into a parallel light beam, a semiconductor substrate for reflecting the light beam, and an objective lens for focussing the light beam reflected from the substrate on the optical disk. A +E,fra 1/4+EE wavelength plate is situated between the substrate and the objective lens. A beam splitter which transmits the light from the laser and reflects the light returning from the disk is provided between the collimator lens and the substrate. Following the beam splitter, a collective lens, a cylindrical lens and an optical detector are arranged in this order on an optical path for the returning light. A light receiving element for outputting a signal corresponding to the intensity of the light received is formed on the semiconductor substrate, and a polarizing film is formed on the surface thereof.
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申请公布号 |
US5555232(A) |
申请公布日期 |
1996.09.10 |
申请号 |
US19940336782 |
申请日期 |
1994.11.09 |
申请人 |
OLYMPUS OPTICAL CO., LTD. |
发明人 |
KOBAYASHI, SHOHEI;YAMAZAKI, TAKESHI;YANAGIDA, TSUNEO;TAKEMURA, HARUHIKO;OGATA, TOSHIHIRO |
分类号 |
G11B7/12;G11B7/125;G11B7/13;G11B7/135;(IPC1-7):G11B7/00 |
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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