Abstract: In a key switch (10), an inner dome (Din) starts to deform once a distal end portion (21) of the inner dome (Din) comes into contact with a base surface (93a) after an outer dome (Dout) starts to deform. A thick portion (25) extending straight and having a uniform wall thickness in a click generating portion (CL) has the thickness less than or equal to the minimum thickness of a thick portion (23) of an after stroke portion (AF). The degree of inclination of the thick portion (25) with respect to a center line (C0) (direction of pressing) is larger than that of the thick portion (23) with respect to the center line (C0) (?c>?a). Before the after stroke portion (AF) undergoes large deformation, the click generating portion (CL) undergoes buckling to cause a sudden decrease in a reaction force and generate a click feeling.

Abstract: A to-be-depressed member includes an elastic dome. A sectional shape of the dome orthogonal to an axis line (X2) of the dome is line-symmetric about a symmetry axis (Ax). The dome has a three-dimensional shape that is symmetric with respect to a virtual plane (Sx) containing the symmetry axis and the axis line. During a swinging movement responsive to a depressing operation, an opposed surface of an opposed member relatively approaches and contacts a distal end of the dome to deform the dome so as to generate a reactive force. As for an angle defined between the axis line of the dome and a normal line (X1) of the opposed surface, the angle (?0) in an initial state falls in a range from a first angle variation amount from the initial state to a first-contact state to a second angle variation amount from the initial state to a depression-completed state.

Abstract: A support assembly includes a support rotatable along a first surface with respect to a support rail, a repetition lever rotatable on the support, and a jack rotatable on the support and disposed to at least partially overlaps the repetition lever. The repetition lever includes a first contact portion which makes contact with a regulating portion which regulates rotation, the jack includes a second contact portion which makes contact with the regulating portion which regulates rotation, and the repetition lever and the jack are provided so that the first contact portion and the second contact portion overlap each other.

Abstract: A keyboard apparatus includes: a key; a frame; and a connecting portion configured to connect the key and the frame to each other. The connecting portion includes a flexible member having a rod shape and having flexibility that enables the key to pivot with respect to the frame. The flexible member includes a portion that, in entirety of a range of pivotal movement of the key, maintains a state in which a length of a line extending along a neutral axis of the flexible member between two points located on the neutral axis is greater than a length of a straight line connecting the two points to each other.

Abstract: A keyboard musical instrument is provided in which variations in the detection mechanism is corrected so that an appropriate musical sound control can be performed. Detection sections SW1, SW2, and SW3 detect an object at detection positions pSW1, pSW2, and pSW3. On the basis of a detection timing (rT2) by the detection section SW2, a detected key depression speed (V21), and a detection timing (rT3) by the detection section SW3 in a case where the key is depressed in a derivation mode, after a rST32 value is calculated, a stroke correction value calST32 is derived as correction information J and stored in a memory 57. In the performance mode, the musical sound is controlled on the basis of the detection timing by the detection sections SW1, SW2, and SW3 and the stroke correction value calST32.

Abstract: According to an embodiment of the present invention, a keyboard apparatus includes a key; and a connecting member connecting the key to a frame and including a rod-like flexible member arranged between the frame and the key, the key being turned to the frame by bending of the rod-like flexible member.

Abstract: A to-be-depressed member includes an elastic dome. A sectional shape of the dome orthogonal to an axis line (X2) of the dome is line-symmetric about a symmetry axis (Ax). The dome has a three-dimensional shape that is symmetric with respect to a virtual plane (Sx) containing the symmetry axis and the axis line. During a swinging movement responsive to a depressing operation, an opposed surface of an opposed member relatively approaches and contacts a distal end of the dome to deform the dome so as to generate a reactive force. As for an angle defined between the axis line of the dome and a normal line (X1) of the opposed surface, the angle (?0) in an initial state falls in a range from a first angle variation amount from the initial state to a first-contact state to a second angle variation amount from the initial state to a depression-completed state.

Abstract: A keyboard apparatus includes: a key; a frame; and a connecting portion configured to connect the key and the frame to each other. The connecting portion includes a flexible member having a rod shape and having flexibility that enables the key to pivot with respect to the frame. The flexible member includes a portion that, in entirety of a range of pivotal movement of the key, maintains a state in which a length of a line extending along a neutral axis of the flexible member between two points located on the neutral axis is greater than a length of a straight line connecting the two points to each other.

Abstract: A keyboard musical instrument is provided in which variations in the detection mechanism is corrected so that an appropriate musical sound control can be performed. Detection sections SW1, SW2, and SW3 detect an object at detection positions pSWl, pSW2, and pSW3. On the basis of a detection timing (rT2) by the detection section SW2, a detected key depression speed (V21), and a detection timing (rT3) by the detection section SW3 in a case where the key is depressed in a derivation mode, after a rST32 value is calculated, a stroke correction value calST32 is derived as correction information J and stored in a memory 57. In the performance mode, the musical sound is controlled on the basis of the detection timing by the detection sections SW1, SW2, and SW3 and the stroke correction value calST32.

Abstract: In a key switch (10), an inner dome (Din) starts to deform once a distal end portion (21) of the inner dome (Din) comes into contact with a base surface (93a) after an outer dome (Dout) starts to deform. A thick portion (25) extending straight and having a uniform wall thickness in a click generating portion (CL) has the thickness less than or equal to the minimum thickness of a thick portion (23) of an after stroke portion (AF). The degree of inclination of the thick portion (25) with respect to a center line (C0) (direction of pressing) is larger than that of the thick portion (23) with respect to the center line (C0) (?c>?a). Before the after stroke portion (AF) undergoes large deformation, the click generating portion (CL) undergoes buckling to cause a sudden decrease in a reaction force and generate a click feeling.

Abstract: A support assembly includes a support rotatable along a first surface with respect to a support rail, a repetition lever rotatable on the support, and a jack rotatable on the support and disposed to at least partially overlaps the repetition lever. The repetition lever includes a first contact portion which makes contact with a regulating portion which regulates rotation, the jack includes a second contact portion which makes contact with the regulating portion which regulates rotation, and the repetition lever and the jack are provided so that the first contact portion and the second contact portion overlap each other.

Abstract: A switch is constituted by a movable conductive portion and a pair of fixed conductive portions. The fixed conductive portions are arranged on a substrate, and are each constituted by at least one strip member. A first main conductive pattern and a second main conductive pattern are arranged on the substrate in correspondence with the fixed conductive portions. The movable conductive portion electrically shorts the pair of fixed conductive portions upon coming into contact with both of them. The strip members that constitute the fixed conductive portions each have a first end portion and a second end portion in the extending direction, and the end portions are electrically connected to the corresponding main conductive patterns.

Abstract: A keyboard unit includes: a key; a displacement member which is configured to be driven directly or indirectly with the key by a pressing operation of the key to be moved in a forward stroke direction; a detector which is configured to detect that an operation direction of the displacement member has changed from the forward stroke direction to a returning direction; and a generator which is configured to generate sound generation indication information based on information detected by the detector.

Abstract: A support assembly of a keyboard apparatus activated in accordance with pressing of a key to rotate a hammer provided at one end of a hammer shank, the support assembly includes a support rotatably disposed with respect to a frame, a jack having one side rotatably connected to the support and another side including a contact surface which makes contact with a hammer shank roller provided to the hammer shank, and a rib provided to the other side of the jack and projecting to a hammer shank roller side of the contact surface.

Abstract: A keyboard unit includes: a key; a displacement member driven directly or indirectly with the key by a pressing operation to be moved; object detection sections including: detection sections, states of which become state change detection state when detecting changes instates of the key and the displacement member; and a generator, in a case that states of all the object detection sections become the state change detection state in the forward stroke of a key pressing operation, obtaining detection results of at least two sets of the detection sections, each set including two object detection sections, selecting at least one of the obtained detection results of the at least two sets of the detection sections, and generating sound generation indication information based on the selected at least one of the detection results.

Abstract: A keyboard unit includes: a key; a plurality of members which include the key, and each of which has an engaged section for forming an engaged state, the engaged state changed by turning of the key, at least a portion of the engaged section formed of a conductor; a detector which is configured to detect information on the engaged state of the plurality of members by detecting a conduction state between the at least portions of the engaged sections which are in contact with each other; and a determiner which is configured to determine a musical sound parameter based on a detection result of the detector.

Abstract: A switch is constituted by a movable conductive portion and a pair of fixed conductive portions. The fixed conductive portions are arranged on a substrate, and are each constituted by at least one strip member. A first main conductive pattern and a second main conductive pattern are arranged on the substrate in correspondence with the fixed conductive portions. The movable conductive portion electrically shorts the pair of fixed conductive portions upon coming into contact with both of them. The strip members that constitute the fixed conductive portions each have a first end portion and a second end portion in the extending direction, and the end portions are electrically connected to the corresponding main conductive patterns.

Abstract: A support assembly of a keyboard apparatus activated in accordance with pressing of a key to rotate a hammer provided at one end of a hammer shank, the support assembly includes a support rotatably disposed with respect to a frame, a jack having one side rotatably connected to the support and another side including a contact surface which makes contact with a hammer shank roller provided to the hammer shank, and a rib provided to the other side of the jack and projecting to a hammer shank roller side of the contact surface.

Abstract: A reaction force generator includes: a base member mounted on a supporter supporting an operating member pivotably; a dome member protruding from the base member; and a top member provided on a protruding-side end of the dome member to be pressed by the operating member toward the base member. The dome member is deformed to produce a reaction force when the top member is pressed by the operating member. A basal-end-side plane and a distal-end-side plane intersect each other at a position located on one of opposite sides of the dome member which is nearer to a pivot fulcrum of the operating member. The basal-end-side plane includes a line of intersection between the base member and the dome member adjacent to each other. The distal-end-side plane includes a line of intersection between the dome member and the top member adjacent to each other.

Abstract: A keyboard apparatus has a plurality of white keys and black keys each of which pivot. The keyboard apparatus also has a plurality of reaction force generation members 21w and 21b provided for the white keys and the black keys, respectively. The reaction force generation members 21w and 21b have dome portions 21w1 and 21b1, respectively, which are thin and shaped like a dome so as to be elastically deformed by depression, and base portions 21w3 and 21b3, respectively, which are thick and are formed integrally with the dome portions 21w1 and 21b1 to support the dome portions 21w1 and 21b1, the base portions 21w3 and 21b3 jutting outward from respective lower end surfaces of the dome portions 21w1 and 21b1. The vertical position of the lower end of the dome portion 21w1 is displaced from the vertical position of the lower end of the dome portion 21b1.