Patent ID: 9424825
Filing Date: 2016-08-23
CPC Classification: G10H

Claim Text:
1. A keyboard apparatus for an electronic musical instrument, the keyboard apparatus comprising: a plurality of keys composed of white keys and black keys, each key pivoting about a corresponding pivot axis so that a front end thereof is movable up and down; and a plurality of reaction force generation members each provided for one of the plurality of keys, and made of an elastic body, wherein each of the plurality of reaction force generation members is depressable by a depression of the corresponding key to generate a reaction force against the depression of the corresponding key, wherein each of the reaction force generation members has a dome portion, which is thin and having a dome shape, the dome portion being elastically deformed by depression, and a base portion, which is thick and integral with the dome portion to support the dome portion, extending downwardly and radially outwardly from a lower end of the dome portion, wherein a position of a point of intersection between a first line extending across the lower end surface of the dome portion of one of the white keys and an axis line of the dome portion of either the one white key or one of the black keys is vertically displaced from a position of a point of intersection between a second line extending across the lower end surface of the dome portion of the one black key and the axis line of the dome portion of either the one white key or the one black key, and wherein the first line is perpendicular to the axis line of the dome portion of the one white key and the second line is perpendicular to the axis line of the dome portion of the one black key.