Photo-electro-magnetic disc device

Details Photo-electro-magnetic disc device Photo-electro-magnetic disc device

1988-08-01

1990-02-13

McElheny, Jr., Donald

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 14, 369291, G11B 1304

Patent

active

049013033

ABSTRACT:
A photo-electro-magnetic disc device has a photo-electro-magnetic disc accommodated in a disc cartridge load as a unit into cartridge holder loaded in the disc device. The cartridge holder with the end of a loading mechanism moves the disc onto a turn table. An optical head and a magnetic field applying part for recording data are loaded facing opposite sides of the disc. Magnetic members are provided on the same side of the disc as is the optical head and are connected to the cartridge holder which is made of magnetic material as to confront magnetic field applying part through the disc. A magnetic circuit which includes the disc is thus formed whereby the magnetic flux from the magnetic field applying part passes through the disc thereby providing a high magnetic field strength throughout the entire region of the disc to be irradiated by a light spot from the optical head.

REFERENCES:
patent: 4610009 (1986-09-01), Connell
patent: 4837758 (1989-06-01), Motoyama et al.
patent: 4843600 (1989-06-01), Miyajima et al.

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