Dynamic magnetic information storage or retrieval – Head – Coil
Patent
1985-02-25
1987-03-10
Heinz, A. J.
Dynamic magnetic information storage or retrieval
Head
Coil
360125, G11B 517, G11B 5127
Patent
active
046494499
ABSTRACT:
A magnetic head for perpendicularly magnetizing a magnetic recording medium having a first magnetic pole to reverse the magnetization in the magnetic recording medium which has been magnetized beforehand in a certain direction, and a second magnetic pole to control reversal of the magnetization in the recording medium effected by the first pole. This construction (1) provides a high density multi-track structure in the head; (2) increases reproduction output, while lessening influence thereon due to a spacing loss by use of a magnetic material and a magneto-resistive element for the respective magnetic poles; (3) provides lower power consumption and fringe effect noise, and smooth running of the recording medium by constructing the first magnetic pole with a permanent magnet, particularly, in cylindrical form; (4) miniaturizes the magnetic head by reducing the number of the parts, by making one of the magnetic poles the first and second auxiliary magnetic poles, and forming an erasing magnetic pole with the first auxiliary magnetic pole, to improve the writing efficiency; (5) simplifies manufacturing, improves wear-resistance of the poles, and provides high density recording by forming the permanent magnet in a thin film on the recording medium sliding surface of the first magnetic pole by thin film deposition; and (6) prevents cross-talk by providing a load-sharing type winding on one of the poles to reduce the number of windings, and by giving an azimuth angle to the magnetic pole, and improves recording efficiency by connecting both poles.
REFERENCES:
patent: 4222084 (1980-09-01), Nakagawa
patent: 4251842 (1981-02-01), Iwasaki
patent: 4253127 (1981-02-01), Kodama
patent: 4277808 (1981-07-01), Nagaki
patent: 4317148 (1982-02-01), Chi
Goto Hirokazu
Sawada Takeshi
Toda Yasushi
Canon Kabushiki Kaisha
Heinz A. J.
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