Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1985-01-16
1987-08-18
Richardson, Robert L.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 45, 369112, 369119, G11B 700
Patent
active
046882014
ABSTRACT:
A two-stage beam positioning apparatus for use in an optical data storage device is provided. A fixed assembly includes a light beam source and detector, light beam focusing and track following apparatus. The fixed assembly is optically coupled to a movable assembly which provides coarse positioning of a focused light spot on a data storage medium such as an optical recording disc. The coarse positioning assembly is mechanically independent from the light beam source and detector assembly and, therefore, may be made very stiff and light resulting in a high bandwidth and reduced data access time. Since the light beam source and detector assembly and the focusing and track following control apparatus are mechanically isolated from the movable coarse positioning assembly, the size and mass of these components are not critical and do not affect data access time.
REFERENCES:
patent: 1759594 (1930-05-01), Round
patent: 4498158 (1985-02-01), Akiyama
IBM Technical Disclosure Bulletin, vol. 20, #1, Jun. 1977, pp. 400-402.
Campbell David K.
Towner David K.
Hewlett--Packard Company
Murray Leslie G.
Richardson Robert L.
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