Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the record
Patent
1996-12-23
1999-08-31
Faber, Alan
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the record
360 741, 360 7303, G11B 1548
Patent
active
059461551
ABSTRACT:
Three kinds of stop patterns are recorded at the same cylinder position of at least three recording surfaces of disk media. Each pattern is a division pattern in which one circumference is divided into two portions and which are recorded therein. Phases of the division patterns are sequentially deviated in the circumferential direction every 120.degree.. When a motor is activated, the motor stop position is detected on the basis of the stop patterns of the disk media and activating conditions to rotate the motor in a predetermined direction, thereby activating the brushless DC motor having no Hall sensor.
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Principles of Digital Audio by Poklmann, published 1989 pp. 230-236.
Electric Motors and Their Controls by Kenjo, published 1991 pp. 107-110.
Faber Alan
Fujitsu Limited
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