Dynamic magnetic information storage or retrieval – Head – Read only detector using light for reading magnetically...
Patent
1983-07-19
1986-10-21
Wolff, John H.
Dynamic magnetic information storage or retrieval
Head
Read only detector using light for reading magnetically...
360110, G11B 5127
Patent
active
046189017
ABSTRACT:
A magnetic head for digital signal recording/reproducing (FIG. 11) having a C-ring shaped core (11.1) with a gap (G) for introducing leakage flux of a recording medium, a conductor (11.2, Y) for generating bias flux in hard magnetization axis of the core (11.1), apparatus (10.3, 11.3) for illuminating the core (11.1) with polarized optical beam, apparatus (11.4) for analyzing beam reflected by the core to convert polarization rotation to optical strength, and photo-detector (12.5) for providing electrical output signal relating to optical strength. The core is small enough to have a single magnetic domain, and is magnetized in the whole area because of the presence of the bias flux in spite of weak leakage signal flux, thus, the core has the capability to amplify signal flux, thus, the present head has high sensitivity and is capable of detecting flux in small area to be used for high density recording higher than 8000 bits/mm.
REFERENCES:
patent: 3196206 (1965-07-01), Griffiths
patent: 3475738 (1969-10-01), Louis et al.
patent: 3592964 (1971-07-01), Waring
patent: 3737236 (1973-06-01), Borrelli
patent: 4101947 (1978-07-01), Lambeth
Morrison et al., "Readback Head for High-Density Recording", IBM Technical Disclosure Bulletin, vol. 9, No. 2, Jul. 1966, p. 124.
Albert et al., "Magneto-Optical Read-Out System", IBM Technical Disclosure Bulletin, vol. 14, No. 7, Dec. 1971, p. 2160.
O'Brien, "Magneto-Optic Conversion Device", IBM Technical Disclosure Bulletin, vol. 13, No. 8, Jan. 1971, p. 2276.
Hatakeyama Iwao
Ishii Osamu
Maeda Yasushi
Yoshii Shizuka
Bussan Matthew J.
Nippon Telegraph & Telephone Public Corporation
Wolff John H.
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