Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1993-02-23
1994-08-16
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7804, 360 7809, 360 7812, G11B 2102, G11B 5596
Patent
active
053392060
ABSTRACT:
A mechanical variation of a voice coil motor and an electrical variation of a servo loop are corrected, thereby performing a head positioning control of a high accuracy. When a measurement mode is set, a zero-cross frequency f.sub.0 at which a gain of open loop characteristics of the servo loop is set to 0 dB (gain =1) is known. By adding the frequency f.sub.0 to the servo loop, an open loop gain G.sub.OP is obtained. A correction coefficient K to set the open loop gain into an ideal value 0 dB (gain=1) is obtained as K=1/G.sub.OP and is stored into a correction table. In the ordinary access, a drive signal of an actuator is corrected by a correction coefficient K read out with reference to the correction table in accordance with the present cylinder position and the corrected drive signal is sent to the actuator.
REFERENCES:
patent: 4755977 (1988-07-01), Abed
patent: 5159254 (1992-10-01), Teshima
patent: 5182684 (1993-01-01), Thomas et al.
Fujitsu Limited
Psitos Aristotelis
Sheladia Varsha V.
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