Dynamic magnetic information storage or retrieval – Head – Read only detector using light for reading magnetically...
Patent
1992-10-19
1994-03-08
Levy, Stuart S.
Dynamic magnetic information storage or retrieval
Head
Read only detector using light for reading magnetically...
369 13, 369 4412, 369110, 369112, 385 11, 385 14, G11B 7135, G11B 1114
Patent
active
052932915
ABSTRACT:
A device comprises five wave guides and two interposed TE-TM mode splitters, formed on a substrate. A first mode splitter splits a first wave guide into second and third wave guides, and a second mode splitter splits a third wave guide into fourth and fifth wave guides. A light beam directed to the first wave guide through the second wave guide is radiated to a magneto-optical recording medium. A signal light beam carrying the information recorded on the medium, reflected by the medium, is directed to the third wave guide through the first mode splitter, and the polarization plane of the signal light beam is rotated by a polarization plane rotation device. The signal light beam is further split by the second mode splitter and directed to the fourth and fifth wave guides, thence to external detectors.
REFERENCES:
patent: 3990776 (1976-11-01), Tseng et al.
patent: 4220395 (1980-09-01), Wang et al.
patent: 4861128 (1989-08-01), Ishikawa et al.
patent: 4945525 (1990-07-01), Yamamoto et al.
patent: 4991160 (1991-02-01), Premji
Akasaka Hideki
Doi Masaaki
Ohki Hiroshi
Ditmyer Paul J.
Levy Stuart S.
Nikon Corporation
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