Optical/magnetic composite head having magnetic and optical head

Details Optical/magnetic composite head having magnetic and optical head Optical/magnetic composite head having magnetic and optical head

1990-03-29

1993-03-09

Chin, Tommy P.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 13, 369 4412, 369 4414, 369 4417, 369110, 360114, G11B 1304, G11B 712

Patent

active

051930820

ABSTRACT:
A photomagnetic composite head comprising a magnetic head and an optical head that are integrated into one unit, an optical waveguide path of the optical head being located in the surface of the magnetic head that faces a recording medium, and a laser beam that passes through the optical waveguide path being irradiated on a point on the recording medium where a magnetic field is impressed from the magnetic head, whereby recording can be performed under a condition in which the coercivity of the recording medium has been lowered by the laser beam, thus making it possible to achieve high density recording by using a recording medium with a high coercivity.

REFERENCES:
patent: 4706232 (1987-11-01), Funada et al.
patent: 4914643 (1990-04-01), Maeda
patent: 5020041 (1991-05-01), Nakao et al.
patent: 5022018 (1991-06-01), Vogelgesang
S. Ura et al., "An Integrated-Optic Disk Pickup Device" OQe85-72 pp. 39-46.
S. Fujiwara et al., "Proton-Exchanged Fresnel Lenses in Ti:LiNbO.sub.3 Waveguides", OQE84-83, pp. 1-7.

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