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:
Apr. 13, 1999
Filed:
Feb. 12, 1998
Applicant:
Inventor:
Hiroshi Kumita, Kawasaki, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02K / ;
U.S. Cl.
CPC ...
318364 ; 318 63 ; 318 65 ; 318 86 ; 318362 ; 318366 ;
Abstract
A spindle motor control method stops a spindle motor which rotates in a forward direction in response to a rotation signal. The spindle motor control method includes two steps. First, a brake signal is supplied to the spindle motor for rotating the spindle motor in a reverse direction when stopping the spindle motor which rotates in the forward direction. Second, the rotation signal and the brake signal are put in an OFF state when a frequency generator signal FG, which indicates a rotational phase of the spindle motor and is generated based on an output of the spindle motor, is not detected for a predetermined time.