Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Drum record
Patent
1993-04-26
1994-10-25
Heinz, A. J.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Drum record
G11B 560
Patent
active
053594819
ABSTRACT:
A floating magnetic head, which suppresses the effects of an external magnetic head and has rails of good flatness. The winding of the head can be wound at high efficiency. The number of turns n.sub.1 of the coil on the side of the leading end is set less than the number of turns n.sub.2 of the coil on the side of the trailing end. The product of the number of turns n.sub.1 of the coil on the side of the leading end and the cross-sectional area A.sub.1 of the core leg on the side of the trailing end is set substantially equal to the product of the number of turns n.sub.2 of the coil on the side of the tailing end and the cross-sectional area A.sub.2 of the core leg on the side of the trailing end. That is, n.sub.1 .multidot.A.sub.1 =n.sub.2 .multidot.A.sub.2. The magnitude of the noise voltage induced across the coil on the side of the leading end is substantially equal to the magnitude of the noise voltage induced across the coil on the side of the trailing end. Furthermore, the two coils are wound in opposite senses. Therefore, noise voltage produced in the whole floating magnetic head is null. In this manner, the generation of noise due to an external magnetic field is prevented. Since the number of turns n.sub.1 of the coil on the side of the leading end is smaller, the whole groove is not required to be made deep. Hence, the amount of the overhang of one rail can be reduced, whereby the flatness can be improved. Furthermore, the interference with the bottom of the groove can be avoided. This improves the efficiency of the operation to wind the coils.
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patent: 5021910 (1991-06-01), Murakami
Heinz A. J.
Letscher George J.
Minebea Co. Ltd.
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