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:
Dec. 06, 2016
Filed:
Mar. 16, 2015
Applicant:
Fanuc Corporation, Yamanashi, JP;
Inventors:
Assignee:
FANUC CORPORATION, Yamanashi, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F 3/023 (2006.01); G01R 31/02 (2006.01); G06F 3/02 (2006.01); H03M 11/20 (2006.01);
U.S. Cl.
CPC ...
G01R 31/02 (2013.01); G06F 3/0202 (2013.01); G06F 3/023 (2013.01); G06F 3/0233 (2013.01); H03M 11/20 (2013.01);
Abstract
A matrix key input interface has key common signal lines and key data signal lines wired in a matrix and key switches disposed at positions where the key common signal lines intersect the key data signal lines. The key data signal lines are periodically monitored while key scan signal is not output to any of the key common signal lines. Based on the results of monitoring, an earth fault is detected in key common signal lines or key data signal lines.