Abstract: A key structure which is free from separation between a wood part thereof and a key base body to which the wood part is secured and has enhanced vertical rigidity in the vicinity of a clearance between the base end of the key base body and the wood part. In the key structure, the key base body has an extended part formed integrally with the base end and extended forward therefrom. The wood part is fixedly bonded to the upper surface of the extended part. A clearance is formed transversely of the key base body between the wood part and the base end. An upper plate body is fixedly bonded to both the upper surface of the wood part and the upper surface of the base end, and the rear part of the upper plate body extends in a manner spanning the base end and the wood part above the clearance.

Abstract: A key structure which is capable of giving a woody appearance to the key, and increasing the freedom of mounting at least one functional part formed as a separate part from the key structure, while maintaining excellent machinability. An upper plate has an increased width part corresponding to an end of a white key toward a player. In the key structure, a wood part is secured to the lower surface of at least the increased width part of the upper plate, and has an increased width part having substantially the same width as the increased width part of the upper plate. The key structure is mountable in a keyboard apparatus, for functioning as a white key pivotally moved by key-depressing operation. A recess is formed in a part of the wood part including the increased width part, which opens downward and has a width (W0) not less than 50% and not more than 80% of the width (B0) of the increased width part of the wood part.

Abstract: A key structure which is capable of giving a woody appearance to the key, and increasing the freedom of mounting at least one functional part formed as a separate part from the key structure, while maintaining excellent machinability. An upper plate has an increased width part corresponding to an end of a white key toward a player. In the key structure, a wood part is secured to the lower surface of at least the increased width part of the upper plate, and has an increased width part having substantially the same width as the increased width part of the upper plate. The key structure is mountable in a keyboard apparatus, for functioning as a white key pivotally moved by key-depressing operation. A recess is formed in a part of the wood part including the increased width part, which opens downward and has a width (W0) not less than 50% and not more than 80% of the width (B0) of the increased width part of the wood part.

Abstract: A key structure which is free from separation between a wood part thereof and a key base body to which the wood part is secured and has enhanced vertical rigidity in the vicinity of a clearance between the base end of the key base body and the wood part. In the key structure, the key base body has an extended part formed integrally with the base end and extended forward therefrom. The wood part is fixedly bonded to the upper surface of the extended part. A clearance is formed transversely of the key base body between the wood part and the base end. An upper plate body is fixedly bonded to both the upper surface of the wood part and the upper surface of the base end, and the rear part of the upper plate body extends in a manner spanning the base end and the wood part above the clearance.

Abstract: A key structure which is capable of giving a woody appearance to the key, and increasing the freedom of mounting at least one functional part formed as a separate part from the key structure, while maintaining excellent machinability. An upper plate has an increased width part corresponding to an end of a white key toward a player. In the key structure, a wood part is secured to the lower surface of at least the increased width part of the upper plate, and has an increased width part having substantially the same width as the increased width part of the upper plate. The key structure is mountable in a keyboard apparatus, for functioning as a white key pivotally moved by key-depressing operation. A recess is formed in a part of the wood part including the increased width part, which opens downward and has a width (W0) not less than 50% and not more than 80% of the width (B0) of the increased width part of the wood part.

Abstract: A key structure which has a key formed by a wood part so as to present a woody appearance and which makes it possible to prevent support members thereof that support the wood part from being damaged during machining of the wood part for width adjustment. The key structure functions as a key pivotally moved by key depression when it is mounted in a keyboard apparatus. A wood part includes a narrow part having opposite lateral sides. An elongated upper plate body has opposite lateral sides, and fixedly supports the wood part. Recessed parts are formed in the respective lateral sides of the upper plate body at least in a substantial entirety of a region of the upper plate body in a longitudinal direction of the key structure where the wood part does not exist. The recessed parts are recessed laterally inward of the respective lateral sides of the narrow part of the wood part.

Abstract: An operation apparatus is responsive to a physical action for inputting a control parameter of a musical sound into an electronic musical instrument. The operation apparatus is provided with a plurality of movable members individually responsive to the physical action to undergo a reciprocal movement. A frame mounts the plurality of the movable members in aligned manner. A tension member having a length is supported at both ends thereof by the frame to extend along the movable members such that each movable member may come into contact with the tension member during the course of the reciprocal movement of each movable member. A detector is connected to the tension member for detecting a deflection of the tension member caused by the contact of the movable member, and generates a signal corresponding to the detected deflection as the control parameter.

Abstract: An operation apparatus is responsive to a physical action for inputting a control parameter of a musical sound into an electronic musical instrument. The operation apparatus is provided with a plurality of movable members individually responsive to the physical action to undergo a reciprocal movement. A frame mounts the plurality of the movable members in aligned manner. A tension member having a length is supported at both ends thereof by the frame to extend along the movable members such that each movable member may come into contact with the tension member during the course of the reciprocal movement of each movable member. A detector is connected to the tension member for detecting a deflection of the tension member caused by the contact of the movable member, and generates a signal corresponding to the detected deflection as the control parameter.

Abstract: A keyboard assembly for an electronic musical instrument comprises at least a plurality of keys, a key support member and a plurality of key-return springs. The key support member rotatably supports the keys; and the key-return spring is provided between the key and key support member so as to press up the key to a normal position. Mechanical parameters which affect a key scaling to key-touch responses of the keys are sizes, shapes and locations of parts of the keyboard assembly, which are set by analyzing motions of an action mechanism of an acoustic piano. For example, weight of the key is adjusted using a deadweight member so as to provide a specific key-touch response for the key. An amount of elastic resilience, made by the key-return spring, is adjusted by changing at least one location, at which one end of the key-return spring is terminated, so as to provide a specific key-touch response for the key.

Abstract: A keyboard assembly for an electronic musical instrument comprises at least a plurality of keys, a key support member and a plurality of key-return springs. The key support member rotatably supports the keys; and the key-return spring is provided between the key and key support member so as to press up the key to a normal position. Mechanical parameters which affect a key scaling to key-touch responses of the keys are sizes, shapes and locations of parts of the keyboard assembly, which are set by analyzing motions of an action mechanism of an acoustic piano. For example, weight of the key is adjusted using a deadweight member so as to provide a specific key-touch response for the key. An amount of elastic resilience, made by the key-return spring, is adjusted by changing at least one location, at which one end of the key-return spring is terminated, so as to provide a specific key-touch response for the key.

Abstract: An electronic musical instrument having a searching function of a tone color is provide with a parameter degree memory and a mouse or the like for designating any desired range of a specified parameter degree. When the searching is executed, the tone color whose parameter's degree is included within the designated range of the specified parameter is found out.