Multi-beam optical pick-up

Details Multi-beam optical pick-up Multi-beam optical pick-up

1988-12-28

1992-04-14

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369112, 369 4423, 369 4424, G11B 700

Patent

active

051054108

ABSTRACT:
A multi-beam optical pick-up for use in an optical disc system includes a light source for emitting two light beams which are focused onto an optical disc to form two light spots thereon. The pick-up also includes an optical system to receive light reflected from the optical system and to divide the reflected light into a first light beam and a second light beam. Also provided in the pick-up are a first detector for detecting an opto-magnetic signal and a focusing error signal from the first light beam and a second detector for detecting a tracking error signal for the two light spots formed on the optical disc with respect to a desired recording track thereof.

REFERENCES:
patent: 4507763 (1985-03-01), Kato
patent: 4517667 (1985-05-01), Sprague
patent: 4546463 (1985-10-01), Ophei et al.
patent: 4694443 (1987-09-01), Ando
patent: 4807212 (1989-02-01), Kaneda et al.
patent: 4890272 (1989-12-01), Ando

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