发明名称 |
Integrated optical pick-up device |
摘要 |
An optical pick-up device for use in an optical disc information recording/reproducing apparatus is provided. In the present optical pick-up device, the functions of two or more separate optical elements provided in the prior art structure are combined or integrated in a single element to reduce the total number of separate optical elements provided in the device. In particular, use is made of a diffraction grating rather than lenses and/or lenses are formed as holo lenses. A diffraction grating and a holo lens may be formed substantially in the shape of flat plates, to define an optical components can be put together to define an integrated subassembly, which reduces the total number of discrete elements, facilitates manufacturing and eliminates the necessity of adjustments among optical elements once set.
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申请公布号 |
US5060212(A) |
申请公布日期 |
1991.10.22 |
申请号 |
US19880232321 |
申请日期 |
1988.08.15 |
申请人 |
RICOH COMPANY, LTD. |
发明人 |
FUJITA, KAZUHIRO;INOKUCHI, TOSHIYUKI;BABA, NOBUYUKI;MAEDA, HIDEO;OHUCHIDA, SHIGERU |
分类号 |
G11B7/09;G11B7/135 |
主分类号 |
G11B7/09 |
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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