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:
Jun. 26, 2012
Filed:
Feb. 12, 2010
Ikuya Sato, Tokyo, JP;
Hiroshi Takahashi, Tokyo, JP;
Ikuya Sato, Tokyo, JP;
Hiroshi Takahashi, Tokyo, JP;
Fuji Electric Co., Ltd., Kawasaki-shi, JP;
Abstract
In an anomaly monitoring device, in which an output signal from an encoder is input as an analog input signal via a wiring system, for detecting anomalies in the encoder or the wiring system, provided are a voltage level based device, a pulse number based device and a pulse width based device. The voltage level based device detects anomalies when the voltage level of the analog input signal exists within a prescribed range. The pulse number based device detects anomalies when the difference in the numbers of pulses of digital signals corresponding to the analog input signals is equal to or greater than a prescribed threshold value. The pulse width based device detects anomalies when the pulse width of the digital signals, measured from a combined signal of the digital signals or each of the digital signals, is different from the pulse width in a past control period.