Motor drive semiconductor integrated circuit and magnetic...

Details Motor drive semiconductor integrated circuit and magnetic... Motor drive semiconductor integrated circuit and magnetic...

2007-10-09

2007-10-09

Sniezek, Andrew L. (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S078060, C360S077020

Reexamination Certificate

active

11098644

ABSTRACT:
The Invention provides a motor drive semiconductor integrated circuit for driving and controlling a voice coil motor that can conduct a seek operation, a track follow operation and a settling operation through PWM control, has desired control accuracy and can be produced by a CMOS process. In a voice coil motor drive circuit (200) for executing positioning control of a magnetic head by feedback-controlling a driving current of a voice coil motor (108) for moving a magnetic head (106) over a magnetic disk for reading information from a storage track on the magnetic disk driven for rotation while a read state of the magnetic head is being monitored, head movement control such as a seek operation, a track follow operation etc, of the magnetic head is executed by PWM driving on the basis of a command value from a controller.

REFERENCES:
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patent: 6040674 (2000-03-01), Nishida et al.
patent: 7034490 (2006-04-01), Sawtell et al.
patent: 2003/0021057 (2003-01-01), Hill
patent: 2003/0065469 (2003-04-01), Pedrazzini et al.
patent: 10 191678 (1998-07-01), None
patent: 2002 184137 (2002-06-01), None

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