Focus servo control device for optical disks having servo offset

Details Focus servo control device for optical disks having servo offset Focus servo control device for optical disks having servo offset

1986-02-03

1988-09-06

Richardson, Robert L.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

250201, 369 46, G11B 700

Patent

active

047698012

ABSTRACT:
A focus servo control device has a focus driver for driving an optical system having an objective lens, and a servo control section for detecting that the optical system is within a focus servo control range. A focus servo control loop is formed in response to a detection signal representing that the optical system is in the focus servo control range, and the optical system is driven under servo control until the amount of light reflected by the optical disk is detected as a maximum.

REFERENCES:
patent: 3896304 (1975-07-01), Aoki et al.
patent: 4128847 (1978-12-01), Roullet et al.
patent: 4439848 (1984-03-01), Ceshkovsky et al.
patent: 4488275 (1984-12-01), Ceshkovsky et al.

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