Tracking control device of an optical pick-up

Details Tracking control device of an optical pick-up Tracking control device of an optical pick-up

1987-11-19

1989-05-30

McElheny, Jr., Donald

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 46, G11B 7085

Patent

active

048357545

ABSTRACT:
A tracking control system for use in an optical pick-up of an optical disc recording and reproducing apparatus includes a pair of photoelectric elements for receiving light reflecting from an optical disk. A pair of light current outputs obtained from the photoelectric elements is processed to produce a differential signal. A low pass filter is provided as a phase delay compensation circuit for compensating the low frequency component of the differential signal. During a track jump mode, the differential signal is processed through the low pass filter whose output is added with a kick pulse to produce a drive signal for use in a tracking actuator. The input side of the low pass filter may be disconnected during a track jump mode, thereby causing the low pass filter to also serve as a holding circuit for holding the voltage of the differential signal immediately prior to track jump.

REFERENCES:
patent: 4544838 (1985-10-01), Musha et al.
patent: 4613963 (1986-09-01), Hirano
patent: 4677602 (1987-06-01), Okano et al.
patent: 4698795 (1987-10-01), Yoshio

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