Abstract: A detected part is provided at a displacement member acting in conjunction with a white key or a hammer. Since the displacement member is capable of being formed smaller compared to the white key and the hammer, dimensional errors are less likely to occur in each displacement member. Further, since the displacement member is configured to be pivotally supported on a relatively small holder mounted to a substrate rather than on a chassis, mounting errors of each displacement member are also less likely to occur. By reducing the dimensional errors and the mounting errors, a clearance between a coil and the detected part is easily set to a dimension according to a design value at each key. Thus, key press information of each key can be detected with high accuracy.

Abstract: A rigid layer 121 more rigid than a first cushion layer 120 that is relatively soft is laminated on a surface layer side of the first cushion layer 120, so the performer can be imparted with a relatively rigid full stroke feel due to the rigid layer. Thus, the white key 2a can be suppressed from being pushed into the aftertouch performance region. Meanwhile, at the time when the rigid layer 121 is strongly pushed during aftertouch performance, the white key 2a can be significantly displaced due to the deformation of the relatively soft first cushion layer 120. Therefore, aftertouch can be detected with high accuracy.

Abstract: Since a white key 2a and a holder 9 to which the displacement member 8 is pivotally supported are assembled to the same chassis 4, the relative positional accuracy between the white key 2a and the displacement member 8 can be improved. As a result, the guide pin 73 of the linkage member 7 and the groove 80 of the displacement member 8 can be accurately engaged at the position as designed. Therefore, the initial position (angle) of the displacement member 8 before key-pressing and the displacement amount (rotation amount) of the displacement member 8 accompanying key-pressing are more likely to follow the design value. Consequently, the key-pressing information of the white key 2a can be detected with high accuracy.

Abstract: Since the curvature of a plane part 82b is smaller than that of a curved surface part 82a, it is possible for the distance between a coil 100 and the detected part 82 (plane part 82b) to be short in the aftertouch performance region than the case where the detected part 82 is one arc shape centered on a rotation shaft 90. Accordingly, the dynamic range can expand (with a significantly decrease in the sensor output value in the aftertouch performance region) without enlarging the displacement member 8 (coil 100). Accordingly, aftertouch can be accurately detected while the displacement member 8 can be miniaturized.

Abstract: A keyboard device includes: a support member; and keys swingably supported by the support member. One of the support member and the key includes a guide groove guiding swinging of a key rear portion, and the other includes a guide shaft extending in a scale direction, inserted into the guide groove, and sliding along the guide groove when the key swings. The keys comprise white and black keys. When a point where a guide shaft center is positioned in a pre-key-pressed state is a starting point of the guide groove, a point where the guide shaft center is positioned in a state where the key is pressed to an ending edge position is an ending point of the guide groove, and a line connecting the starting and ending points is an angle of the guide groove, the angle of the guide groove differs between the white or black keys.

Abstract: Since an entire guided surface (from an upper end of an inclined surface to a lower end of a curved surface) faces a guide surface in a scale direction at an initial position before key pressing, even if grease is scraped upward due to swinging of a white, the grease is likely to stay in sliding regions on the guided surfaces. In addition, since a spacing between the guide and guided surfaces gradually widens from the upper end sides to the lower ends of the guided surfaces, even if the guided surfaces slides downward with respect to the guide surface when the white key is pressed, the grease applied to each of the surfaces is unlikely to be scraped off downward. This also makes it easier to retain the grease in the sliding regions on the guided surfaces. Thus, a feeling of pressing the white key can be improved.

Abstract: Swinging of a rear portion of a white key 2a is guided through sliding between a shaft portion 41 and a guide groove 60, and an attachment member 6 having the guide groove 60 is formed using a soft material having a lower hardness than a resin (for example, an ABS resin) which will become a material of the white key 2a and a chassis 4. Accordingly, for example, compared to when the attachment member 6 is formed using the same material (relatively hard) as the white key 2a and the chassis 4, it is possible to curb occurrence of noise when the guide groove 60 slides along the shaft portion 41 of the chassis 4. Thus, it is possible to give a favorable feeling of playing to a player.

Abstract: A keyboard device includes a support member, a plurality of keys swingably supported by the support member and arranged side by side in a scale direction, and a hammer interlocked with swinging of each key. The hammer includes a receiving part recessed downward. Each key includes a protrusion protruding downward and inserted into the receiving part. An arc surface is formed on at least one of a bottom surface of the receiving part and a lower surface of the protrusion. When each key swings, the protrusion rotates about a center of a circle including the arc surface.

Abstract: A keyboard device is provided including a chassis; a mass body which is turnably installed in the chassis; and transmission means which transmits a driving force in response to key touching of a key to the mass body, wherein the mass body includes an inner wheel and an outer wheel installed on a radially outward side of the inner wheel and is configured to serve as a component for transmitting a torque in one-way direction between the inner wheel and the outer wheel. The transmission means is engaged with one of the inner wheel and the outer wheel of the mass body. The torque is transmitted between the inner wheel and the outer wheel of the mass body at a time of key touching. The torque is not transmitted between the inner wheel and the outer wheel of the mass body at a time of key release.

Abstract: A keyboard device is provided including a chassis; a mass body which is turnably installed in the chassis; and transmission means which transmits a driving force in response to key touching of a key to the mass body, wherein the mass body inclues an inner wheel and an outer wheel installed on a radially outward side of the inner wheel and is configured to serve as a component for transmitting a torque in one-way direction between the inner wheel and the outer wheel. The transmission means is engaged with one of the inner wheel and the outer wheel of the mass body. The torque is transmitted between the inner wheel and the outer wheel of the mass body at a time of key touching. The torque is not transmitted between the inner wheel and the outer wheel of the mass body at a time of key release.

Abstract: A keyboard device has a plurality of keys, wherein each key includes: a base member formed of a resin material in a box shape having an open lower surface opposite a touching surface, the base member having a rotatably supported base end side; and a pair of wood members formed of a wood material in a rectangular plate shape, disposed respectively on left and right side surfaces of the base member, wherein at least one of the pair of wood members has a thickness dimension within a range of 2 mm or more and 14.5 mm or less.

Abstract: The invention provides a keyboard device of an electronic musical instrument, wherein a hammer can be installed correctly by a simple operation of pressing a key. The keyboard device of the electronic musical instrument includes: a chassis; a key disposed rotatably on the chassis and extending from the rear to a front; a support shaft disposed on the chassis in front of the rotation center; a hammer rotating in conjunction with the key along with pressing on the front of the key; a retaining hole formed through the hammer and retaining the support shaft; a guide groove guiding the support shaft in the retaining hole; and a shifting means, shifting from a temporarily secured state to a retained state, and pressing the hammer in the temporarily secured state toward the rear to shift the hammer to the retained state along with the pressing on the front of the key.

Abstract: The invention provides a keyboard device of an electronic musical instrument, wherein a hammer can be installed correctly by a simple operation of pressing a key. The keyboard device of the electronic musical instrument includes: a chassis; a key disposed rotatably on the chassis and extending from the rear to a front; a support shaft disposed on the chassis in front of the rotation center; a hammer rotating in conjunction with the key along with pressing on the front of the key; a retaining hole formed through the hammer and retaining the support shaft; a guide groove guiding the support shaft in the retaining hole; and a shifting means, shifting from a temporarily secured state to a retained state, and pressing the hammer in the temporarily secured state toward the rear to shift the hammer to the retained state along with the pressing on the front of the key.

Abstract: The present invention provides an electronic keyboard instrument capable of strongly supporting an upper panel covering the rear of a key while suppressing shaking of the key and an increase in device size. An electronic keyboard instrument (1) of the present invention includes: a key (3), rotating about a rotating shaft (24); an upper panel (4), covering the rear of the key (3) from above; a chassis (2), disposed in a position to interpose the rear of the key (3) between the chassis (2) and the upper panel (4); a through hole (32a), passing through the rear of the key (3) to communicate a side toward the chassis (2) with a side toward the upper panel (4); and a rear guide (25), passing from the chassis (2) through the through hole (32a) to extend toward the upper panel (4) and supporting the upper panel (4).

Abstract: A keyboard device capable of suppressing noise that occurs upon release of the key is provided. The key is formed with a protrusion and a hammer is formed with a sliding surface. Moreover, the hammer is provided with contact portions that come into contact with a side surface of the protrusion when the key is pressed to the bottom in a key-pressing direction. Thus, when the key is released, the contact between the side surface of the protrusion and the contact portions prevents the key from rotating before the hammer, thereby preventing the protrusion from departing from the sliding surface and suppressing the generation of noise that occurs when the protrusion falls on (hits) the sliding surface.

Abstract: The present invention provides an electronic keyboard instrument capable of strongly supporting an upper panel covering the rear of a key while suppressing shaking of the key and an increase in device size. An electronic keyboard instrument (1) of the present invention includes: a key (3), rotating about a rotating shaft (24); an upper panel (4), covering the rear of the key (3) from above; a chassis (2), disposed in a position to interpose the rear of the key (3) between the chassis (2) and the upper panel (4); a through hole (32a), passing through the rear of the key (3) to communicate a side toward the chassis (2) with a side toward the upper panel (4); and a rear guide (25), passing from the chassis (2) through the through hole (32a) to extend toward the upper panel (4) and supporting the upper panel (4).

Abstract: A keyboard device has a plurality of keys, wherein each key includes: a base member formed of a resin material in a box shape having an open lower surface opposite a touching surface, the base member having a rotatably supported base end side; and a pair of wood members formed of a wood material in a rectangular plate shape, disposed respectively on left and right side surfaces of the base member, wherein at least one of the pair of wood members has a thickness dimension within a range of 2 mm or more and 14.5 mm or less.

Abstract: A keyboard device capable of suppressing noise that occurs upon release of the key is provided. The key is formed with a protrusion and a hammer is formed with a sliding surface. Moreover, the hammer is provided with contact portions that come into contact with a side surface of the protrusion when the key is pressed to the bottom in a key-pressing direction. Thus, when the key is released, the contact between the side surface of the protrusion and the contact portions prevents the key from rotating before the hammer, thereby preventing the protrusion from departing from the sliding surface and suppressing the generation of noise that occurs when the protrusion falls on (hits) the sliding surface.

Abstract: A keyboard device capable of reconstructing a unique clicking sense of an acoustic piano is provided. A first incline portion (a plane or curved surface) of a sliding surface is inclined towards a direction gradually departing from a base portion of a protrusion along a displacement direction of the protrusion in a key-pressing operation for reducing a resistance exerted on the protrusion and suppressing a gradual increase of a sense of resistance. Moreover, a bump portion located at where the protrusion reaches after sliding through the first incline portion is used to increase the resistance exerted on the protrusion for increasing the sense of resistance. When the protrusion crosses over the bump portion, the sense of resistance is reduced. Accordingly, variation in the sense of resistance before and after the bump portion is increased, and the unique clicking sense of the acoustic piano is reproduced.

Abstract: A keyboard device capable of reconstructing a unique clicking sense of an acoustic piano is provided. A first incline portion (a plane or curved surface) of a sliding surface is inclined towards a direction gradually departing from a base portion of a protrusion along a displacement direction of the protrusion in a key-pressing operation for reducing a resistance exerted on the protrusion and suppressing a gradual increase of a sense of resistance. Moreover, a bump portion located at where the protrusion reaches after sliding through the first incline portion is used to increase the resistance exerted on the protrusion for increasing the sense of resistance. When the protrusion crosses over the bump portion, the sense of resistance is reduced. Accordingly, variation in the sense of resistance before and after the bump portion is increased, and the unique clicking sense of the acoustic piano is reproduced.