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:
Jul. 18, 2006
Filed:
Nov. 30, 1999
Carlo Vertemara, San Jose, CA (US);
Paolo Menegoli, San Jose, CA (US);
Giorgio Pedrazzini, Laguna Niguel, CA (US);
Carlo Vertemara, San Jose, CA (US);
Paolo Menegoli, San Jose, CA (US);
Giorgio Pedrazzini, Laguna Niguel, CA (US);
STMicroelectronics, Inc., Carrollton, TX (US);
Abstract
A control circuit controls a motor assembly having a coil and a movable arm. The control circuit includes a drive circuit that is coupled to the coil and that generates a drive signal in response to a control signal and a speed signal. The control circuit also includes a sensor circuit that is coupled to the drive circuit and to the coil and that generates the speed signal at a level that corresponds to the speed of the arm. In a disk drive, such a circuit can be used to control the movement of a read-write-head assembly during parking and unparking of a read-write head. The circuit monitors the speed of the head and uses this speed information as feedback to maintain the speed of the head within a specified range. This prevents damage to the head and other disk-drive components, particularly in a disk drive that incorporates a head parking platform.