Keyboard apparatus of electronic musical instrument
AssigneeYamaha Corporation
InventorsShinji Kumano, Keisuke Watanabe, Susumu Ohi
Life of this patent
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Abstract
A keyboard apparatus of an electronic musical instrument includes keys, mass members, and springs. Each key can pivot about a first pivot fulcrum. Each mass member can pivot about a second pivot fulcrum. Each spring supplies a biasing force to at least the corresponding mass member so that the mass member returns to an initial state. In this apparatus, each key has a point of application for pivoting the corresponding mass member in the same direction as a pivoting direction of each key when each key is depressed.
Claims56
A keyboard apparatus for an electronic musical instrument, comprising:
- keys each capable of pivoting about a first pivot fulcrum;
- mass members each capable of pivoting about a second pivot fulcrum in cooperation with the corresponding key to provide the corresponding key with inertia of the mass member when the corresponding key is depressed;
- and
- springs for supplying biasing forces to at least said mass members so that said mass members are biased toward initial states,
- wherein each of said keys has a point of application for pivoting a corresponding one of said mass members in the same rotational direction as a pivoting direction of said each key when said each key is depressed.
A keyboard apparatus of an electronic musical instrument, comprising:
- a plurality of keys, each of which pivots about a first pivot fulcrum;
- a plurality of weight members corresponding to said keys respectively, each of which pivots about a second pivot fulcrum in cooperation with the corresponding key to provide the corresponding key with inertia of the weight member when the corresponding key is depressed;
- and
- a plurality of biasing means corresponding to said keys respectively, each of which is constituted by a common spring member which biases said corresponding weight member and said corresponding key to initial states.
A keyboard apparatus of an electronic musical instrument, comprising:
- a plurality of keys, each of which pivots about a first pivot fulcrum, each key including side walls;
- a plurality of weight members corresponding to said keys respectively, each of which pivots about a second pivot fulcrum in cooperation with the corresponding key to provide the corresponding key with inertia of the weight member when the corresponding key is depressed;
- and
- a plurality of biasing means corresponding to said keys respectively, each of which is constituted by a single spring member which biases said corresponding key and a weight member corresponding to said key to initial states;
- each of said weight members and each of said biasing means being positioned between the inner side walls of the corresponding key.
A keyboard apparatus of an electronic musical instrument, comprising:
- a plurality of keys, each of which pivots about a first pivot fulcrum;
- a plurality of weight members corresponding to said keys respectively, each of which pivots about a second pivot fulcrum in cooperation with the corresponding key to provide the corresponding key with inertia of the weight member when the corresponding key is depressed;
- and
- a plurality of biasing means corresponding to said keys respectively, each of which is constituted by a single spring member which biases said corresponding key to an initial state,
- each of the weight members comprising first, second and third portions, said first portion being pivoted about said second fulcrum and extending substantially in a horizontal direction, said second portion extending downwardly from said first portion, the third portion further extending substantially horizontally from said second portion and along the corresponding key.
Dependencies are inferred from the claim text.