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. 05, 1995
Filed:
Nov. 30, 1994
Applicant:
Inventor:
Sadakazu Shiga, Iwaki, JP;
Assignee:
Alps Electric Co., Ltd., Tokyo, JP;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03M / ;
U.S. Cl.
CPC ...
341 25 ; 341 26 ;
Abstract
An N-key rollover circuit including a matrix of crossing drive and output lines, switch elements connected between the drive and output lines, series resistors connected to the switch elements and current detectors connected to the output lines. A grounded current detection resistor is connected to an input terminal of each current detector, each current detection resistor having a resistance value which is smaller than the resistance value of the series resistors such that most of the drive transmitted through a selected switch element onto an output line passes through the current detection resistor, even if more than one switch element is selected.