Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1996-09-19
1997-11-18
Dinh, Tan
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
369 4429, 369 4427, G11B 1722, G11B 700
Patent
active
056894830
ABSTRACT:
An optical storage apparatus for confirming that an optical head reaches a predetermined position by using no positional sensor, is disclosed. The optical storage apparatus includes a stopper provided in the predetermined position, a drive circuit for driving a moving unit for moving the optical head, a pulse width modulation circuit for comparing a value of current flowing across the drive circuit with a current indicating value and modulating a width of the drive pulse given to the drive circuit in accordance with a compared result, and a control circuit for giving the current indicating value to the pulse width modulation circuit, monitoring the width of the drive pulse, and thus confirming that the optical head impinges upon the stopper and stops by the monitoring, or a control circuit for giving the drive signal by which the pulse width modulation circuit outputs the drive pulse having a fixed pulse width, monitoring the value of current flowing across the drive circuit, and thus confirming that the optical head impinges upon the stopper and stops by the monitoring.
REFERENCES:
patent: 4783774 (1988-11-01), Enomoto
patent: 5187696 (1993-02-01), Ishii et al.
patent: 5566141 (1996-10-01), Yamaguchi et al.
Dinh Tan
Fujitsu Limited
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