Optical information disc apparatus with autofocusing servo syste

Details Optical information disc apparatus with autofocusing servo syste Optical information disc apparatus with autofocusing servo syste

1982-11-03

1985-09-17

Richardson, Robert L.

Dynamic information storage or retrieval

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

Mechanism control by the control signal

G11B 700

Patent

active

045424918

ABSTRACT:
An optical information disc apparatus includes a laser source, a recording medium with an information track, an optical system for emitting a laser beam from the laser source onto the information track, a photodetector detecting the focus error of the optical system using the light reflected from the information track, and an auto-focusing servo system operating the optical system to make the focus of the system follow the upward and downward movement of the recording medium, the optical information disc apparatus being further provided with a control circuit to make the auto-focusing servo system effective only when the optical system is in a position equivalent to the linear region of a defocusing signal having an S-curve characteristic.

REFERENCES:
patent: 4128847 (1978-12-01), Roullet et al.
patent: 4357696 (1982-11-01), Bierhoff et al.

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