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:
Sep. 18, 2001
Filed:
Jun. 20, 2000
Masayoshi Sakai, Urawa, JP;
Koichi Futsuhara, Urawa, JP;
The Nippon Signal Co., Ltd., Tokyo, JP;
Abstract
A counting apparatus having excellent fail-safe characteristics can be used in a rotation-stopped detection apparatus. As a first feature, timing of a high-frequency signal P,is carried out by a counter,after completion of a counting of pulse signals P,. When the frequency of the timing output for the high-frequency signal is a predetermined value, a judgment signal, indicating that the counting is normal, is generated by a frequency discriminating circuit,. As a second feature, a counter,is preset using a preset signal. Then, after verifying by an output from a self hold circuit,that the counter,has been reset, a counting output is generated from a self hold circuit,. As a third feature, the counting apparatus is used as timer circuits,, and the generation frequency of a rotation detection pulse signal I,based on a sensor signal, is obtained to thereby detect a rotation-stopped condition of a rotating body.