High-density magnetic recording and optical reproducing apparatu

Details High-density magnetic recording and optical reproducing apparatu High-density magnetic recording and optical reproducing apparatu

1990-06-04

1992-03-03

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369100, 369109, 369116, 369 13, 360 59, G11B 700

Patent

active

050938223

ABSTRACT:
A high-density magnetic recording and optical reproducing apparatus for magneto-optically reproducing information magnetically recorded on information tracks on a recording medium, the apparatus comprising two laser beam sources emitting laser beams having different wavelengths respectively, an optical system for directing the laser beams from the two laser beam sources toward and onto the recording medium so as to irradiate the recording medium with laser beam spots partly overlapping each other, two photo detectors detecting the laser beams reflected from the surface of the recording medium, and a differential amplifier detecting the difference between the output signals of the two photo detectors thereby generating the differential signal as a reproduced output.

REFERENCES:
patent: 4544443 (1985-10-01), Ohta et al.
patent: 4853912 (1989-08-01), Akasaka et al.
patent: 4871614 (1989-10-01), Kobayashi

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