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:
Mar. 20, 2012
Filed:
Mar. 05, 2010
Akihiko Komatsu, Hamamatsu, JP;
Akihiko Komatsu, Hamamatsu, JP;
Yamaha Corporation, Hamamatsu-shi, JP;
Abstract
A keyboard musical instrument has a solenoid including a plunger and a coil into which the plunger is inserted, a drive unit for applying voltage to the solenoid, and a key which moves together with the plunger, and on which a force generated by the solenoid is exerted. The drive unit includes a position detector for detecting position of the key in the direction in which the key is depressed or released. By varying voltage which is to be applied to the solenoid in accordance with the position of the key detected by the position detector while the key is in motion, the drive unit varies the force which is to be generated by the solenoid.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile