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. 26, 2013
Filed:
Jun. 25, 2010
Akihiko Komatsu, Hamamatsu, JP;
Nariyasu Yaguchi, Hamamatsu, JP;
Yoshinori Hayashi, Iwata, JP;
Yamaha Corporation, , JP;
Abstract
A keyboard apparatus includes a key supported for pivoting movement about a pivot point, a mass member for imparting a reaction force to performance operation of the key in interlocked relation to the key, a transmission member provided in abutment with both of the key and mass member to transmit a load from one of the key and mass member to the other, and an electromagnetic actuator for driving, via a fixed coil, the transmission member toward at least one of the key or mass member. Good key touch feeling can be achieved not only by a load applied from the mass member to the key but also through load control by the actuator. Thus, it is possible to faithfully reproduce a key touch feeling approximate to that in a natural keyboard instrument, such as an acoustic piano, with a simple construction and facilitated control.