发明名称 |
Optical focus detection employing rotated interference patterns. |
摘要 |
<p>In an optical data storage disk device, focus of the recording and sensing beam is detected by sensing lateral shear (rotational orientation of a light interference pattern) of a beam (34) reflected from the optical data storage disk (10). An exemplary shear detector includes a quadrant sensor having four quadrants for sensing the rotation of the reflected beam's interference pattern. Electrical analysis circuits illustrate evaluation of the sensed rotated interference pattern.</p> |
申请公布号 |
EP0158790(A2) |
申请公布日期 |
1985.10.23 |
申请号 |
EP19850101926 |
申请日期 |
1985.02.22 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
COHEN, DONALD KENNETH |
分类号 |
G02B7/28;G02B27/28;G11B7/09;(IPC1-7):G11B7/09;G02B7/11 |
主分类号 |
G02B7/28 |
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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