Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2005-11-15
2005-11-15
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
Reexamination Certificate
active
06965488
ABSTRACT:
A disk drive is disclosed comprising a pulse width modulated (PWM) signal generator for generating PWM control signals applied to the driver switches of a voice coil motor (VCM). The PWM control signals comprise a PWM cycle time, a Tforward time interval of the PWM cycle time wherein a positive control voltage is applied to the VCM, a Treverse time interval of the PWM cycle time wherein a negative control voltage is applied to the VCM, and a Tdead time interval of the PWM cycle time wherein a substantially zero control voltage is applied to the VCM. The Tdead time interval is adjusted to control a magnitude of an actual ripple current flowing through the VCM.
REFERENCES:
patent: 5654840 (1997-08-01), Patton et al.
patent: 5663846 (1997-09-01), Masuoka et al.
patent: 5767638 (1998-06-01), Wu et al.
patent: 5838515 (1998-11-01), Mortazavi et al.
patent: 5857787 (1999-01-01), Ryan
patent: 5973437 (1999-10-01), Gradzki et al.
patent: 5986426 (1999-11-01), Rowan
patent: 6097564 (2000-08-01), Hunter
patent: 6373650 (2002-04-01), Pedrazzini
patent: 6556461 (2003-04-01), Khersonsky et al.
patent: 6639373 (2003-10-01), Knight et al.
patent: 6711034 (2004-03-01), Duerbaum et al.
Sheerin, Esq. Howard H.
Tzeng Fred F.
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