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Article: California Inventor Develops Disk Drive
- Article from:
- US Fed News Service, Including US State News
- Article date:
- October 25, 2006
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ALEXANDRIA, Va., Oct. 25 -- George J. Bennett of Murrieta, Calif., has developed a disk drive that comprises a disk and a voice coil motor (VCM) having a voice coil for actuating a head over the disk.
According to the U.S. Patent & Trademark Office: "A VCM driver comprises an H-bridge driver having a plurality of driver switches for driving current through the voice coil to ground. A first pulse width modulated (PWM) signal controls a first voltage level driving the voice coil relative to a duty cycle of the first PWM signal, and a second PWM signal controls a second voltage level driving the voice coil relative to a duty cycle of the second PWM signal, wherein the first voltage level ...