Reading head in integrated optics for reading information record

Details Reading head in integrated optics for reading information record Reading head in integrated optics for reading information record

1987-11-19

1989-01-03

Moffitt, James W.

Static information storage and retrieval

Information masking

Polarization

350375, 365124, G11C 1306

Patent

active

047962267

ABSTRACT:
The head comprises a light source (S), a polarizer (P), a parabolic mirror (MP1), a second parabolic mirror (MP2), a polarization converter grating (RCP), a reflector (M), a separating plate (LS) and a detector (D). The beam diffracted by (RCP) constitutes a reference beam and the beam which has passed through (RCP) an analysis beam. The interference state of these two beams is dependent upon the orientation of the magnetization of the support to be read.

REFERENCES:
patent: 3576547 (1971-04-01), Aldrich
patent: 3859643 (1975-01-01), Borrelli
patent: 3990037 (1976-11-01), Carlo
patent: 3990059 (1976-11-01), Carlo et al.
patent: 3996576 (1976-12-01), Bullock
patent: 4220395 (1980-09-01), Wang
patent: 4497007 (1985-01-01), Greiner et al.
Japanese Patent Abstracts, vol. 7, No. 101 (P-194) (1246), 28 Apr. 1983, & JP-A-58 23 337 (Cannon K.K., 12.02.83.
IEEE Transactions on Instrumentation and Measurement, vol. 25, No. 1, Mar. 1976, pp. 1-7, New York, US, J. E. Thompson et al.

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