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. 08, 2002
Filed:
Sep. 05, 2001
Alps Electric Co., Ltd., Tokyo, JP;
Abstract
A rotation angular speed detection apparatus that accurately detects a low rotation angular speed of a rotating body includes: a receiving part for receiving rotation angles at predetermined time intervals from a rotation angle sensor that detects rotation angles of a rotating body; a storage part for storing received rotation angles; and a control part. When the difference between a first arbitrary angle stored and a second angle stored before the first angle is less than a predetermined value, the control part determines, from the stored rotation angles, a third angle in which a difference between the first angle and the third angle is more than the predetermined value, and the control part divides the difference between the first angle and the third angle by the time required from storing of the third angle to storing of the first angle to detect a rotation angular speed.