Dynamic magnetic information storage or retrieval – Head
Patent
1986-07-10
1987-06-30
Wolff, John H.
Dynamic magnetic information storage or retrieval
Head
360123, 360134, G11B 5127
Patent
active
046775129
ABSTRACT:
An apparatus for reproducing a signal recorded, in the form of a perpendicular signal magnetization, on a perpendicular magnetic recording layer backed with a high permeability layer of a magnetic recording medium. A thin-film magnetic material is disposed to face the recording layer so that an enlarged magnetized region is formed in the high permeability layer, which includes the position at which the magnetic material faces the recording layer. In this region, magnetic variation occurs in response to the signal magnetization of the recording layer at the position the magnetic material faces the recording layer. A detecting member such as a coil is disposed in the proximity of the magnetic material so as to be magnetically coupled to the enlarged magnetized region of the high permeability layer. The detecting member is used as a tuning element of a tuning circuit supplied with high frequency energy. A resonance output voltage of the high frequency circuit varies in response to the detection of magnetic variation in the high permeability layer. A reproducing circuit detects the variation in the resonance output voltage of the high frequency circuit to reproduce the signal recorded on the recording layer.
REFERENCES:
patent: 2926844 (1960-03-01), Devol
patent: 4120011 (1978-10-01), Kolb
patent: 4182987 (1980-01-01), Moeller
patent: 4464691 (1984-08-01), Sawazaki et al.
patent: 4530016 (1985-07-01), Sawazaki
patent: 4575777 (1986-03-01), Hosokawa
Akiyama Junichi
Chiba Shu
Sawazaki Norikazu
Yatabe Shigeru
Bussan Matthew J.
Kabushiki Kaisha Toshiba
Wolff John H.
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