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. 23, 2016
Filed:
Sep. 09, 2014
Yamaha Corporation, Hamamatsu-shi, Shizuoka-ken, JP;
Ichiro Osuga, Hamamatsu, JP;
Hiroshi Harimoto, Hamamatsu, JP;
YAMAHA CORPORATION, , JP;
Abstract
A key () is supported by key supporting portions () so that the key () can pivot. A reaction force generation member () is shaped like a dome to be elastically deformed by a key-depression of the key (). At the time of the elastic deformation, the reaction force generation member () increases a reaction force from the beginning with an increasing amount of elastic deformation. After the reaction force reaches its peak, the reaction force generation member () buckles to reduce the reaction force. A normal line of a plane (P) including a pivot axis (C) of the key () and a depression point of a depression portion () is designed to be roughly parallel to an axis line (Y) of the reaction force generation member () at the point in time when the reaction force of the reaction force generation member () reaches its peak.