Provided is a reaction force generation unit that enables stabilization of a reaction force to be generated and enhances processing accuracy. In a pressed body 20, three domes including a first dome 22-1, a second dome 22-2, and a third dome 22-3, bulge from a base 21. A leading end 23 of each dome 22 faces an opposing surface 11 of an opposing member 10. When the base 21 is pressed by the pressing member 13, the leading ends 23 of the domes 22 move in a direction relatively close to the opposing member 10. At this time, the domes 22 are elastically deformed and cause an appropriate reaction force with respect to the handle. In a natural state where the pressed body 20 is not subjected to any pressing force, axes X1, X2, and X3 of the domes 22-1, 22-2, and 22-3 are substantially parallel to each other, and acute angles formed by the axes X1, X2, and X3 and a normal line X0 of the opposing surface 11 are substantially similar to each other at a predetermined angle 0 larger than zero degree.

A relationship of 0<.sub.1<2.sub.1 is satisfied, where .sub.1 is an angle formed between a first line which is vertical to a parallel line passing through a pivot center point and being parallel to a pivot extending direction, passes through a center point of a first portion from the center point of the first portion toward the parallel line, and a second line which is vertical, at the center point of the first portion, to a first portion extending direction, passes through the center point of the first portion toward a vertical line being vertical to the parallel line and passing through the pivot center point, and where .sub.1 is an angle formed between the first line and a third line connecting the pivot center point and the center point of the first portion from the center point of the first portion toward the pivot center point.

A switching device includes: an actuator that is rotatable; and a contact member including an upper surface section having a flat portion and is movable in a vertical direction according to rotation of the actuator, and a deformation section disposed between a support member and an end portion of the upper surface section and deformed according to movement of the upper surface section. A chamfer portion interconnecting a contact surface contacting with the contact member and a side surface, of the actuator, is provided between a virtual plane containing an end portion, in an extending direction of the rotary shaft, of the upper surface section, and is perpendicular to the upper surface section and a virtual plane containing an end portion, in the extending direction of the rotary shaft, of a portion where the deformation section makes contact with the support member, and is perpendicular to the upper surface section.

A sensor includes: an upper electrode; a lower electrode provided facing the upper electrode; an upper electrode support portion provided in an upper portion of the upper electrode; a deforming portion provided at both ends of the upper electrode support portion and enabling a distance between the upper electrode and the lower electrode to be changed; a rotatable actuator arranged facing the upper electrode support portion; and a member arranged between the upper electrode support portion and the actuator, and capable of moving relative to at least one of the actuator and the upper electrode support portion when the actuator presses the upper electrode support portion.

A signal supply device according to an embodiment of the present invention includes a generator configured to generate a first sound signal and a second sound signal in accordance with an instruction signal including operation body information corresponding to an operation input to an operation body and linked member information corresponding to a movement of a linked member linked with the operation body and an adjuster configured to adjust a relationship between the first sound signal and the second sound signal on the basis of the operation body information and the linked member information.

A keyboard apparatus includes a key, a frame, and a flexible section which rotates the key with respect to the frame, the flexible section having a longitudinal direction, and including a region where both a length of the flexible section in a first direction perpendicular to a scale direction and a length of the flexible section in a second direction perpendicular to the first direction continuously increase toward ends of the flexible section in a cross section perpendicular to the longitudinal direction of the flexible section.

Provided is a switching device for an electronic musical instrument, comprising: a plurality of first electrodes that are adjacently arranged; a second electrode arranged between a pair of the plurality of first electrodes, and insulated from the plurality of first electrodes by a plurality of spaces; a rotatable actuator; and a conductive member configured to electrically connect the first electrodes and the second electrode according to rotation of the actuator. The plurality of spaces extend longitudinally in a first direction. The first direction is a direction between a rotational shaft direction of the actuator and a direction orthogonal to the rotational shaft direction.

A signal supply device according to an aspect of the present invention includes a generator configured to generate a first sound signal and a second sound signal in accordance with an instruction signal corresponding to an operation input to an operation body and an adjuster configured to calculate an acceleration of the operation body in accordance with the instruction signal and to adjust a relationship between the first sound signal and the second sound signal on the basis of the acceleration.

A keyboard device includes: a frame; a plurality of keys including a first key and a second key, the plurality of keys rotating around the frame; and a plurality of guides for restricting an operation of each of the plurality of keys, at positions different in a vertical direction, each of the plurality of guides including a first member that is softer than the frame and the plurality of keys, and a second member that is harder than the first member, wherein each of the plurality of guides is in a first state where a corresponding one of the keys comes into contact with the first member, or in a second state where the corresponding one of the keys comes into contact with the second member.

Signalling apparatus for a sound system, the signalling apparatus being configured for communicating with a processor, the signalling apparatus comprising: an identifier comprising a unique parameter value for identifying a sound property associated with the signalling apparatus; and an electrical contact configured to electrically connect with an electrical contact associated with the processor to communicate the parameter value with the processor, wherein the signalling apparatus is configured such that the electrical contact of the signalling apparatus is substantially fixed with respect to the electrical contact associated with the processor during activation of the sound system and/or signalling apparatus.