Dynamic magnetic information storage or retrieval – Head – Read only detector using light for reading magnetically...
Patent
1982-03-12
1985-01-29
Kilgore, Robert Martin
Dynamic magnetic information storage or retrieval
Head
Read only detector using light for reading magnetically...
346 742, 365 10, G11B 532, G11B 900, G11C 1142, G01D 1506
Patent
active
044970072
ABSTRACT:
This invention relates to a magneto-optical storage and playback process for travelling information carriers, by recording on a magnetizable information carrier (1) in the form of a tape, disc or roller while the carrier is in motion, said information carrier having information areas which are larger than 0.2 .mu.m and smaller than 20 .mu.m in one direction of the information plane, the process being carried out by the production of a geometrical structure (4) by the action of the magnetic fields of the recorded information on particles whose greatest length is less than 0.1 .mu.m, preferably 0.02 .mu.m, and by optical scanning of these structures in which light of wavelength 0.38 to 0.8 .mu.m is diffracted on the surface of the moving information carrier (1) and diffraction images are produced which serve for the interpretation of the information.
REFERENCES:
patent: 3521257 (1970-07-01), Nelson
patent: 3561863 (1971-02-01), Brewster
patent: 3696352 (1972-10-01), Schilling
patent: 3761645 (1973-09-01), Stancel et al.
patent: 3778791 (1973-12-01), Lewicki
patent: 4101905 (1978-07-01), Hale et al.
patent: 4202022 (1980-05-01), Imamura
patent: 4228473 (1980-10-01), Himuro
Patents Abstracts of Japan, vol. 4, No. 15(E-170), Feb. 5, 1980, No. 54-156516.
Greiner Joachim
Nippe Burkhard
Agfa-Gevaert Aktiengesellschaft
Kilgore Robert Martin
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