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:
Feb. 16, 1993
Filed:
Mar. 19, 1990
Yamaha Corporation, Hamamatsu, JP;
Abstract
In construction of a keyboard apparatus in which a plurality of keys are swingably mounted to a fixed key support and change in electric inductance is induced in response to every key operation for adjustment of musical tone control parameters, the change in inductance by an inductance change inducer is detected by at least one planar coil pattern which is arranged such that its mating surface area with the an inductance change inducer should change in correspondence to the key stroke of the key at key operation. Thanks to use of the change in the mating surface area in detection, a linear relationship is obtained between the key stroke and the detection output, which well avoids inter-key variation in detection output for uniform generation of musical tones from different keys.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile