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. 04, 1990
Filed:
Jul. 21, 1989
Applicant:
Inventors:
Takashi Tamaki, Shizuoka, JP;
Yasutoshi Kaneko, Shizuoka, JP;
Assignee:
Yamaha Corporation, Hamamatsu, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G10H / ; G10H / ;
U.S. Cl.
CPC ...
84653 ; 84724 ; 84744 ;
Abstract
An electronic keyboard system according to the present invention has a plurality of key sensor units associated with the keys, respectively, and the key sensor units are paired to form a plurality of sensor pairs to which bidirectional current driving units respectively supplies currents periodically changed in direction for selectively actuating the sensor units, so that the interconnections between the bidirectional current driving units and the sensor units are simplified, thereby decreasing the occupation area in the keyboard system.