Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1994-10-18
1996-10-08
Young, W. R.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 44370, G11B 0709
Patent
active
055638589
ABSTRACT:
A multi-beam recording-reproduction apparatus, which is provided with: a track-crossing signal generation section for releasing a track-crossing signal in response to a reflected light beam derived from a predetermined one of a plurality of light beams that have been projected onto an optical disk from an optical head and that are shifted in the same direction at the same time; and a track-counting circuit for releasing a track-count value in accordance with the track-crossing signal, characterized in that an access control section makes a positioning of the optical head in accordance with the track-count value. This arrangement makes it possible to provide a track-counting operation by installing only one track-crossing signal generation section as well as only one track-counting circuit for use in counting tracks. In other words, the track-counting operation is available by using a simpler construction. As a result, it becomes possible to improve positioning accuracy of the optical head, to reduce the number of parts for constituting the apparatus, and to cut costs of the apparatus.
REFERENCES:
patent: 4677602 (1987-06-01), Okano et al.
patent: 4825431 (1989-04-01), Kimura et al.
Conlin David G.
Michaelis Brain L.
Sharp Kabushiki Kaisha
Tran Thang V.
Young W. R.
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