Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1987-11-13
1988-12-27
Arnold, Bruce Y.
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
350370, 350401, 350608, 369 45, G02B 510, G11B 509
Patent
active
047936967
ABSTRACT:
There is provided a method of moving the position of the focal point of an optical system in an optical data storage device. A membrane reflector having an electrically controllable surface contour is provided in the optical system and the reflector's surface contour is controlled so as to move the focal point on the data storage medium of the optical data storage device. The optical system comprises a source of plane-polarized light, a polarizing beam splitter, first and second quarter-wave plates, the membrane reflector and an objective lens.
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patent: 4124273 (1978-11-01), Huignard et al.
patent: 4445209 (1984-04-01), Mickleson et al.
patent: 4569039 (1986-02-01), Okumura et al.
Printed Publication "Optical Data Storage", The Optical Industry & Systems Purchasing Directory, Book 2, pp. E-144-148, 1983.
Arnold Bruce Y.
Hoechst Celanese Corporation
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