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:
May. 22, 1990
Filed:
Dec. 19, 1988
Applicant:
Inventor:
Takahumi Shiba, Saitama, JP;
Assignee:
Pioneer Electronic Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02K / ;
U.S. Cl.
CPC ...
318364 ; 318362 ;
Abstract
A spindle motor stop control device applies a reverse torque braking force to the spindle motor to effect stopping of the motor. A speed detector detects when the number of rotation of the motor has slowed to 1/n of a predetermined number of rotation and issues a detection signal. The time period beginning with the application of the reverse torque braking force until the issuance of the detection signal is measured. Then, a time period t=T/(n-1) is calculated and the reverse torque braking force is continued for the time, t, and then removed.