Method of and apparatus for the reading of magnetically stored i

Details Method of and apparatus for the reading of magnetically stored i Method of and apparatus for the reading of magnetically stored i

1990-03-13

1991-05-21

Arnold, Bruce Y.

Static information storage and retrieval

Magnetic bubbles

Guide structure

350384, 365117, 365122, 369110, 369134, G02F 109, G11B 700, G11B 1100

Patent

active

050169920

ABSTRACT:
A magnetic storage medium is read by incident polarized light and reflected outgoing light defining a common plane. The polarized incident light preferably has a polarization vector at 40.degree. to 50.degree. to this plane and at the storage medium, the magnetization is in a direction perpendicular to the plane. The preamplified output signal V.sub.M from the photodiode transducing the outgoing light beam has a fixed value V.sub.O subtracted therefrom where V.sub.O is a function of the sensitivity and resolving power of the electronic circuitry. The signal V.sub.M -V.sub.O is then amplified and processed to represent the stored data.

REFERENCES:
patent: 3491351 (1970-01-01), Smaller et al.
patent: 4160270 (1979-07-01), Goldschmidt et al.
patent: 4562568 (1985-12-01), Hazel et al.
patent: 4683421 (1987-07-01), Miller et al.
patent: 4774615 (1988-09-01), Revelli et al.
patent: 4924454 (1990-05-01), Baas

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