Head for reading a magneto-optical data carrier

Details Head for reading a magneto-optical data carrier Head for reading a magneto-optical data carrier

1988-05-13

1990-06-12

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Head

Read only detector using light for reading magnetically...

350400, 358335, G11B 5127

Patent

active

049337947

ABSTRACT:
Data is recorded on a magneto-optical carrier (5), the magnetization of which in each recorded area is capable of reflecting a polarized laser beam (28,31,33) with rotation of the plane of polarization due to the Kerr effect in accordance with the direction of megnetization of the area. The plane of polarization of the beam (33',31',28',34) which is reflected in that way is rotated through about 45.degree. by a half-wave plate (35), the output beam (36) of which is resolved into two components by a prism (39). They are such as to permit discrimination between the two reading signals produced by respective detectors (43,44) in accordance with the sign of the output of a comparator (45).

REFERENCES:
patent: 4451863 (1984-05-01), Vanagida et al.
patent: 4573149 (1986-02-01), Deguchi et al.
patent: 4607359 (1986-08-01), Matsubayashi et al.
patent: 4764912 (1988-08-01), Ando
"Signal Noise, and Codes in Optical Memories", Optical Engineering/Jul., vol. 25, No. 7, pp. 881-891.
"Eraseable Magneto-Optical Recording", Phillips Technical Review/vol. 42, No. 2, Aug. 1985.

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