A keyboard apparatus includes a plurality of keys, a frame supporting the plurality of keys arranged in a first direction, a first member, a longitudinal direction of the first member being along the first direction, and a second member including a first section, a second section, and a third section, the first section, the third section, and the second section being arranged in this order in a second direction perpendicular to the first direction, the first section being a plate-shaped member sandwiched between the first member and the frame, the second section being connected to the first member at a position away from the first section, the third section being separated from the first member between the first section and the second section, and a longitudinal direction of the second member being along the first direction.

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 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.

A musical instrument includes: a fixed member; a movable member displaceable relative to the fixed member within a movable range in response to a playing operation of the musical instrument; a detectable circuit including a magnetic or conductive body and disposed on the movable member; a detector circuit including a coil disposed on the fixed member and configured to output a detection signal corresponding to a voltage that is dependent on a distance between the detectable circuit and the coil; at least one memory storing instructions; and at least one processor configured to implement the instructions to perform a plurality of tasks, including: a generating task that generates, based on correspondences between voltages of detection signals and positions of the movable member in the movable range, position data indicating a position of the movable member that depends on the voltage of the detection signal output from the detector circuit; and a calibrating task that calibrates the correspondences based on the voltage of the detection signal obtained while the movable member is at a predetermined position within the movable range.

A keyboard device and a key depression information detecting method are provided. The keyboard device includes: a coil generating a magnetic field; a displacement member having an outer surface and displaced at a position facing the coil during key depression; and a conductor provided on the displacement member. The conductor includes: a facing portion covering the outer surface of the displacement member to face the coil during key depression; and a front surface portion connected to the facing portion and covering an outer surface of the displacement member which is directed to a front side in a displacement direction of the displacement member.

A keyboard apparatus, which can provide a keyboard apparatus that a size in depth direction is miniaturized, including a frame, a first member, a key, one or more hammer assemblies configured to rotate in accordance with movement of the key. The one or more hammer assemblies including a rotation member rotatably connected to the frame with respect to a rotation axis as a center of rotation and a weight member attached to the rotation member and having a first portion and a second portion. The second portion faces the first member in a first direction extending along the rotation axis, a thickness of the second portion is smaller than a thickness of the first portion in the first direction, and a length of the second portion is larger than a length of the first portion in a rotation direction of the weight member.

A keyboard apparatus includes a plurality of keys, a frame supporting the plurality of keys arranged in a first direction, a first member, a longitudinal direction of the first member being along the first direction, and a second member including a first section, a second section, and a third section, the first section, the third section, and the second section being arranged in this order in a second direction perpendicular to the first direction, the first section being a plate-shaped member sandwiched between the first member and the frame, the second section being connected to the first member at a position away from the first section, the third section being separated from the first member between the first section and the second section, and a longitudinal direction of the second member being along the first direction.

A hammer assembly includes: a pivot member that pivots about a pivot axis; and a weight supported by the pivot member and including a plate portion. The plate portion has a first surface and a second surface opposite to the first surface. The plate portion has: a first region with a thickness defined by a length between the first surface and the second surface in a pivot-axis direction at a portion farthest from the pivot axis; and a second region with a thickness greater than that in the first region. In a case where the areas of the first region and the second region on a projected plane when the first region and the second region are viewed in the pivot-axis direction are compared with each other, the area of the first region is less than the area of the second region.

A keyboard device and a magnetic shield forming method are provided. The keyboard device includes: a plurality of displacement members (detected portions, conductors) arranged in a scale direction and displaced according to an operation of a player; and a substrate having a coil which generates a magnetic field for detecting displacement of the plurality of displacement members. The substrate includes a plurality of the coils provided respectively for the plurality of displacement members, and a magnetic shield partitioning the plurality of coils and formed by a conductive pattern of the substrate.

A detection device including n number of sensors arrayed in a direction, in which n is an integer of 3 or more and from which (n1) pairs of adjacent sensors are formed, and a processor which determines one specified position in the direction based on output values of the n number of sensors, in which the processor calculates (n1) sets of difference values each of which is a difference between two output values corresponding to each of the (n1) pairs of sensors, and determines the one specified position based on the (n1) sets of difference values and correlation positions corresponding to the (n1) sets of difference values and indicating positions correlated with array positions of each pair of sensors.