Optical pick-up selectively reading and writing an optical and m

Details Optical pick-up selectively reading and writing an optical and m Optical pick-up selectively reading and writing an optical and m

1992-01-27

1993-10-05

Nguyen, Hoa

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 13, 360114, G11B 1304

Patent

active

052511960

ABSTRACT:
An optical pick-up for selectively reading and writing an optical and magneto-optical recorded medium, in which light projected on the recorded medium is reflected therefrom and directed onto one of two photodetectors, depending on the polarization of the light. The recorded medium has magnetic domains for storing data and a magneto-optical signal is generated from the difference between the two photo voltages from the two photodetectors. The magneto-optical signal represents the data stored in the magnetic domains. The recorded medium also stores data in pit forms, and an optical signal is generated from the sum of the photovoltages of the two photodetectors, to represent the data stored in the pit forms. The arrangement is suitable for reading out simultaneously the optical signal and the magneto-optical signal.

REFERENCES:
patent: 4730289 (1988-03-01), Saitoh et al.
patent: 4783776 (1988-11-01), Ishigaki et al.
patent: 4807210 (1989-02-01), Kaku et al.
patent: 4858218 (1989-08-01), Takagi et al.
patent: 5020040 (1991-05-01), Lee

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