The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 28, 2003
Filed:
Oct. 28, 1999
Frederick F. Kazmierczak, Erie, CO (US);
T. Jay Cameron, Corralitos, CA (US);
Seagate Technology LLC, Scotts Valley, CA (US);
Abstract
A system and method for unloading a transducer assembly to a ramp positioned outside an outer diameter of a disc in a disc drive system directs current generated from the back EMF (electromotive force) of a spindle motor to supplement current provided by a power supply to a positioning coil. The combined current yields increased torque to park the transducer assembly without requiring unnecessary power consumption during normal disc drive operation. The current generated from the back EMF of the spindle motor is enhanced by accelerating the rotation of the spindle motor to exceed the normal operational rotational velocity of the disc drive system. A position detector provides a trigger signal to control the timing of the switch that combines the current from the back EMF and the current from the power supply to the positioning coil. A modified voice coil motor configuration optimizes the magnetic flux density along the length of the voice coil motor magnets so as minimize unnecessary power consumption while optimizing the magnetic flux density in the region corresponding to the disc surface.