Pickup movement device for detecting speed using pickup driving

Details Pickup movement device for detecting speed using pickup driving Pickup movement device for detecting speed using pickup driving

1990-01-04

1993-01-05

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

369266, 369 32, 360 75, 360 7805, G11G 2110, G11G 2102, G11G 700

Patent

active

051777231

ABSTRACT:
A pickup movement device includes a plurality of electromagnetic driving coils for moving a pickup. It supplies a driving signal to these plurality of electromagnetic driving coils for the purpose of accessing a target track. The movement speed of the pickup can be detected by a track error signal during access. This track error signal is monitored at access time to see whether the pickup device is within an allowable range. When it is out of the allowable range, a speed signal is detected by one of the plurality of electromagnetic driving coils, which is used to prevent a runaway of the pickup.

REFERENCES:
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patent: 4658390 (1987-04-01), Fujii et al.
patent: 4745587 (1988-05-01), Maeda et al.
patent: 4782476 (1988-11-01), Sekimoto et al.
patent: 4858214 (1989-08-01), Baba
patent: 4989190 (1991-01-01), Kuroe et al.

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