US 2015/0090103 A1Published application

Keyboard apparatus for an electronic musical instrument

AssigneeYamaha Corporation

InventorsIchiro OSUGA, Hiroshi HARIMOTO

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Abstract

Reaction force generation members 21w, 21b are made of elastic body to be shaped like domes, respectively, so that the reaction force generation members 21w, 21b can be elastically deformed by depression exerted in directions of axis lines Yw, Yb, respectively, to increase their respective reaction forces from the beginning with the increasing amount of elastic deformation to buckle after respective peaks of the reaction forces to reduce the respective reaction forces. By varying the directions of the axis lines Yw, Yb of the reaction force generation members between a white key 11w and a black key 11b, the respective directions in which the reaction force generation members 21w, 21b are depressed at the peaks of the reaction forces are made close to the directions of the axis lines Yw, Yb of the reaction force generation members 21w, 21b, respectively.

Claims8

Dependent claims

A keyboard apparatus for an electronic musical instrument, the keyboard apparatus comprising:

a plurality of keys composed of a white key and a black key, each key pivoting about a corresponding pivot axis so that a front end of the key can move up and down, and
a plurality of reaction force generation members which are provided for the plurality of keys, respectively, and each of which is depressed by a depression of a corresponding key to generate a reaction force against the depression of the corresponding key, wherein
each of the reaction force generation members is made of an elastic body to be shaped like a dome, and is configured to be elastically deformed by being depressed in an axis line direction to increase the reaction force from a beginning with an increasing amount of elastic deformation to buckle after a peak of the reaction force to reduce the reaction force;
and
the plurality of reaction force generation members are arranged such that the axis line direction of the reaction force generation members is varied between the white key and the black key so that a direction in which each of the reaction force generation members is depressed at the peak of the reaction force is close to the axis line direction of the reaction force generation member.

2 more elements

Dependencies are inferred from the claim text.