WO2018016324A1

WO2018016324A1 - Keyboard device

Info

Publication number: WO2018016324A1
Application number: PCT/JP2017/024721
Authority: WO
Inventors: 賢人小川; 大須賀　一郎
Original assignee: ヤマハ株式会社
Priority date: 2016-07-22
Filing date: 2017-07-05
Publication date: 2018-01-25
Also published as: JP6822476B2; JPWO2018016324A1

Abstract

The present invention makes the touch sensation of an electronic keyboard-type musical instrument more similar to that of an acoustic piano, while ensuring the greatest possible amount of design freedom when introducing a mechanism for obtaining the touch sensation. To this end, a keyboard device is characterized by being equipped with: keys arranged so as to be capable of rotating relative to a frame; a hammer assembly positioned so as to be capable of rotating in response to the rotation of the keys; a first member; a second member which slides along the first member when the hammer assembly rotates in response to the rotation of the keys, is positioned so as to move on the first member, is provided with a first curved surface, the cross-section of which forms a first arc on the first member side thereof, is provided with a second curved surface, the cross-section of which forms a second arc on the side thereof opposite the first member, and is configured in a manner such that the centers of the first and second arcs are identical and the radii thereof are different; and a third member which is connected to the first member and guides the second member so as not to separate from the first member by more than a prescribed distance.

Description

Keyboard device

The present invention relates to a keyboard device.

In an acoustic piano, a predetermined feeling (hereinafter referred to as touch feeling) is given to a player's finger through a key by the action of an action mechanism. In particular, the operation of the escapement mechanism gives the player's finger a feeling of collision according to the key-pressing speed and a subsequent feeling of omission (for example, a click feeling as a whole) as a touch feeling. In an acoustic piano, an action mechanism is required for hammering with a hammer. On the other hand, in an electronic keyboard instrument, a key depression is detected by a sensor, so that sound generation is possible without having an action mechanism such as an acoustic piano. The touch feeling of an electronic keyboard instrument that does not use an action mechanism and an electronic keyboard instrument that uses a simple action mechanism are greatly different from the touch feeling of an acoustic piano. Therefore, various methods have been studied for obtaining a touch feeling similar to an acoustic piano in an electronic keyboard instrument (for example, Patent Document 1).

JP 2013-167790 A

In an electronic keyboard instrument, it is necessary to introduce various mechanisms in order to obtain a touch feeling similar to an acoustic piano, but since the space for this is limited, the degree of freedom in design is decreasing.

One of the objects of the present invention is to provide a degree of design freedom when introducing a mechanism for obtaining a touch feeling while bringing the touch feeling of an electronic keyboard instrument close to an acoustic piano (for example, the size of the sliding surface forming portion). Is to secure as much as possible).

According to an embodiment of the present invention, a key arranged to be rotatable with respect to a frame, a hammer assembly arranged to be rotatable according to the rotation of the key, a first member, and the key When the hammer assembly is rotated in response to the rotation, the hammer assembly is arranged so as to slide on the first member and move on the first member, and a cross section of the first member is a first arc. A second member having a first curved surface, a second curved surface having a second circular arc in cross section on the opposite side to the first member, and the first arc and the second arc having the same center and different radii And a third member that is connected to the first member and guides the second member so that the second member is not separated from the first member by a predetermined distance or more.

The third member may contact the second curved surface in at least a part of a movement range of the second member.

The radius of the first arc may be larger than the radius of the second arc.

The radius of the first arc may be smaller than the radius of the second arc.

The elastic member may be disposed on at least a part of the surface of the first member.

The position of the first curved surface in contact with the first member may change depending on the position of the second member with respect to the first member.

The third member may slide with the second member when the hammer assembly rotates in response to rotation of the key.
The second member includes: a first partial cylindrical portion having the first curved surface; and a second partial cylindrical portion located on the opposite side of the first partial cylindrical portion and having the second curved surface, The first partial cylindrical portion and the second cylindrical portion may have a common central axis, and the radius of the first partial cylindrical portion may be different from the radius of the second partial cylindrical portion.

One of the first member and the second member may be connected to the key, and the other may be connected to the hammer assembly.
The hammer assembly includes a weight portion, and the first member allows the second member to slide relative to the first member when the key is pressed. It is good also as giving force to the 2nd member so that may move up.
Further, the first member is arranged with respect to the key at a position that moves downward by a key pressing operation on the key, and the second member is connected to the hammer assembly, It is good also as connecting to the opposite side to the weight part with respect to the axis of rotation of the hammer assembly so that the weight part may move upward by being pushed downward from the first member.
Furthermore, the third member may be disposed with respect to the key at a position where the second member is sandwiched between the third member and the first member.
Further, the keyboard device includes a key arranged to be rotatable with respect to the frame, a hammer assembly arranged to be rotatable according to the rotation of the key, a first member, and the rotation of the key. The first partial cylindrical portion having a first curved surface that slides with the first member when the hammer assembly is rotated in response to the rotation, and a second curved surface that is located on the opposite side of the first member. A second member provided with a partial columnar part; and a third member connected to the first member for guiding the second member so as not to be separated from the first member by a predetermined distance or more. The one-part columnar part and the second part-columnar part have a common central axis, and the radius of the first part-columnar part may be different from the radius of the second part-columnar part. .
The third member may be in contact with the second curved surface in at least a part of the movement range of the second member.
Further, the radius of the first partial columnar portion may be larger than the radius of the second partial columnar portion.
In addition, the radius of the first partial cylindrical portion may be smaller than the radius of the second partial cylindrical portion.
Further, the first partial columnar portion and the second partial columnar portion may be integrally formed of resin.
Furthermore, the first member includes a sliding surface that comes into contact with the first curved surface, which is an outer peripheral surface of the first partial cylindrical portion, and the third member is an outer peripheral surface of the second partial cylindrical portion. It is good also as providing the guide surface which can contact a certain said 2nd curved surface.

According to the present invention, it is possible to ensure as much as possible the degree of freedom of design when introducing a mechanism for obtaining a touch feeling while bringing the touch feeling of an electronic keyboard instrument closer to an acoustic piano.

It is a figure which shows the structure of the keyboard apparatus in 1st Embodiment. It is a block diagram which shows the structure of the sound source device in 1st Embodiment. It is explanatory drawing at the time of seeing the structure inside the housing | casing in 1st Embodiment from the side surface. It is explanatory drawing of the load generation part (key side load part and hammer side load part) in 1st Embodiment. It is a figure explaining the structure of the sliding face formation part in 1st Embodiment. It is a figure explaining the elastic deformation (at the time of strong hit) of the elastic body in 1st Embodiment. It is a figure explaining the elastic deformation (at the time of weak strike) of the elastic body in 1st Embodiment. It is a figure explaining the structure of the moving member in 1st Embodiment. It is a figure explaining operation | movement of the key assembly when the key (white key) in 1st Embodiment is pressed down. It is a figure explaining the moving member in 2nd Embodiment. It is a figure explaining the moving member in 3rd Embodiment. It is a figure explaining the moving member in 4th Embodiment. It is a figure which illustrates typically the connection relation of the key and hammer of a keyboard assembly in a 5th embodiment.

Hereinafter, a keyboard device according to an embodiment of the present invention will be described in detail with reference to the drawings. The following embodiments are examples of embodiments of the present invention, and the present invention should not be construed as being limited to these embodiments. Note that in the drawings referred to in the present embodiment, the same portion or a portion having a similar function is denoted by the same reference symbol or a similar reference symbol (a reference symbol simply including A, B, etc. after a number) and repeated. The description of may be omitted. In addition, the dimensional ratios of the drawings (the ratios between the components, the ratios in the vertical and horizontal height directions, etc.) may be different from the actual ratios for convenience of explanation, or some of the configurations may be omitted from the drawings.

<First Embodiment>
[Configuration of keyboard device]
FIG. 1 is a diagram illustrating a configuration of a keyboard device according to the first embodiment. In this example, the keyboard device 1 is an electronic keyboard instrument that emits sound in response to a user (player) key depression such as an electronic piano. Note that the keyboard device 1 may be a keyboard-type controller that outputs control data (for example, MIDI) for controlling an external sound source device in response to a key depression. In this case, the keyboard device 1 may not include the sound source device.

The keyboard device 1 includes a keyboard assembly 10. The keyboard assembly 10 includes a white key 100w and a black key 100b. A plurality of white keys 100w and black keys 100b are arranged side by side. The number of keys 100 is N, which is 88 in this example. This arranged direction is called a scale direction. When the white key 100w and the black key 100b can be described without particular distinction, the key 100 may be referred to. Also in the following description, when “w” is added to the end of the reference sign, it means that the configuration corresponds to the white key. Further, when “b” is added at the end of the code, it means that the configuration corresponds to the black key.

A part of the keyboard assembly 10 exists inside the housing 90. When the keyboard device 1 is viewed from above, a portion of the keyboard assembly 10 covered by the casing 90 is referred to as a non-appearance portion NV, and a portion exposed from the casing 90 and visible to the user is referred to as an appearance portion PV. . That is, the appearance part PV is a part of the key 100 and indicates an area where the user can perform a performance operation. Hereinafter, a portion of the key 100 that is exposed by the appearance portion PV may be referred to as a key body portion.

Inside the housing 90, a sound source device 70 and a speaker 80 are arranged. The tone generator 70 generates a sound waveform signal when the key 100 is pressed. The speaker 80 outputs the sound waveform signal generated in the sound source device 70 to an external space. The keyboard device 1 may be provided with a slider for controlling the volume, a switch for switching timbres, a display for displaying various information, and the like.

In the description of the present specification, directions such as up, down, left, right, front, and back indicate directions when the keyboard device 1 is viewed from the performer when performing. Therefore, for example, the non-appearance part NV can be expressed as being located on the back side with respect to the appearance part PV. Further, the direction may be indicated with the key 100 as a reference, such as the front end side (key front side) and the rear end side (key rear side). In this case, the key front end side indicates the front side as viewed from the performer with respect to the key 100. The rear end side of the key indicates the back side viewed from the performer with respect to the key 100. According to this definition, the black key 100b can be expressed as a portion protruding upward from the white key 100w from the front end to the rear end of the key body of the black key 100b.

FIG. 2 is a block diagram illustrating a configuration of the sound source device according to the first embodiment. The sound source device 70 includes a signal conversion unit 710, a sound source unit 730, and an output unit 750. The sensor 300 is provided corresponding to each key 100, detects a key operation, and outputs a signal corresponding to the detected content. In this example, the sensor 300 outputs a signal according to the key depression amount in three stages. The key pressing speed can be detected according to the interval of this signal.

The signal conversion unit 710 acquires the output signal of the sensor 300 (sensors 300-1, 300-2,..., 300-88 corresponding to the 88 key 100), and operates according to the operation state of each key 100. Generate and output a signal. In this example, the operation signal is a MIDI signal. Therefore, the signal conversion unit 710 outputs note-on according to the key pressing operation. At this time, the key number indicating which of the 88 keys 100 has been operated and the velocity corresponding to the key pressing speed are also output in association with the note-on. On the other hand, in response to the key release operation, the signal conversion unit 710 outputs the key number and note-off in association with each other. A signal corresponding to another operation such as a pedal may be input to the signal conversion unit 710 and reflected in the operation signal.

The sound source unit 730 generates a sound waveform signal based on the operation signal output from the signal conversion unit 710. The output unit 750 outputs the sound waveform signal generated by the sound source unit 730. This sound waveform signal is output to, for example, the speaker 80 or the sound waveform signal output terminal.

[Configuration of keyboard assembly]
FIG. 3 is an explanatory diagram when the configuration inside the housing in the first embodiment is viewed from the side. As shown in FIG. 3, the keyboard assembly 10 and the speaker 80 are arranged inside the housing 90. That is, the housing 90 covers at least a part of the keyboard assembly 10 (the connection portion 180 and the frame 500) and the speaker 80. The speaker 80 is disposed on the back side of the keyboard assembly 10. The speaker 80 is arranged so as to output a sound corresponding to the key depression toward the upper side and the lower side of the housing 90. The sound output downward advances from the lower surface side of the housing 90 to the outside. On the other hand, the sound output upward passes through the space inside the keyboard assembly 10 from the inside of the housing 90, and is externally transmitted from the gap between the adjacent keys 100 in the exterior portion PV or the gap between the key 100 and the housing 90. Proceed to Note that the path of sound from the speaker 80 that reaches the space inside the keyboard assembly 10, that is, the space below the key 100 (key body portion), is exemplified as the path SR.

The configuration of the keyboard assembly 10 will be described with reference to FIG. The keyboard assembly 10 includes a connection portion 180, a hammer assembly 200, and a frame 500 in addition to the key 100 described above. The keyboard assembly 10 is a resin-made structure whose most configuration is manufactured by injection molding or the like. The frame 500 is fixed to the housing 90. The connection unit 180 connects the key 100 so as to be rotatable with respect to the frame 500. The connecting portion 180 includes a plate-like flexible member 181, a key-side support portion 183, and a rod-like flexible member 185. The plate-like flexible member 181 extends from the rear end of the key 100. The key side support portion 183 extends from the rear end of the plate-like flexible member 181. A rod-shaped flexible member 185 is supported by the key side support portion 183 and the frame side support portion 585 of the frame 500. That is, a rod-shaped flexible member 185 is disposed between the key 100 and the frame 500. The key 100 can be rotated with respect to the frame 500 by bending the rod-shaped flexible member 185. The rod-shaped flexible member 185 is configured to be attachable to and detachable from the key side support portion 183 and the frame side support portion 585. The rod-like flexible member 185 may be configured so as not to be attached or detached integrally with the key side support portion 183 and the frame side support portion 585, or by bonding or the like.

The key 100 includes a front end key guide 151 and a side key guide 153. The front end key guide 151 is slidably in contact with the front end frame guide 511 of the frame 500. The front end key guide 151 is in contact with the front end frame guide 511 on both sides of the upper and lower scale directions. The side key guide 153 is slidably in contact with the side frame guide 513 on both sides in the scale direction. In this example, the side key guide 153 is disposed in a region corresponding to the non-appearance portion NV on the side surface of the key 100, and exists on the key front end side with respect to the connection portion 180 (plate-like flexible member 181). You may arrange | position to the area | region corresponding to the external appearance part PV.

Also, the key 100 is connected to the key-side load unit 120 below the exterior portion PV. The key-side load portion 120 is connected to the hammer assembly 200 so that the hammer assembly 200 is rotated when the key 100 is rotated.

The hammer assembly 200 is disposed in a space below the key 100 and is rotatably attached to the frame 500. The hammer assembly 200 includes a weight part 230 and a hammer body part 250. The hammer main body 250 is provided with a shaft support portion 220 that serves as a bearing for the rotation shaft 520 of the frame 500. The shaft support portion 220 and the rotation shaft 520 of the frame 500 are slidably in contact with each other at at least three points.

The hammer side load portion 210 is connected to the front end portion of the hammer main body portion 250. The hammer side load section 210 includes a portion (moving member 211 described later; see FIG. 4) that comes into contact with the inside of the key side load section 120 so as to be slidable in the front-rear direction. A lubricant such as grease may be disposed at the contact portion. The hammer-side load unit 210 and the key-side load unit 120 (in the following description, these may be collectively referred to as “load generation unit”) generate a part of the load when the key is pressed by sliding on each other. To do. In this example, the load generating unit is located below the key 100 in the appearance portion PV (frontward from the rear end of the key body). The detailed structure of the load generator will be described later.

The weight portion 230 includes a metal weight, and is connected to the rear end portion of the hammer main body portion 250 (the back side from the rotation shaft). In a normal state (when no key is pressed), the weight portion 230 is placed on the lower stopper 410. As a result, the key 100 is stabilized at the rest position. When the key is depressed, the weight portion 230 moves upward and collides with the upper stopper 430. This defines the end position that is the maximum key depression amount of the key 100. The weight 230 also applies a load to the key press. The lower stopper 410 and the upper stopper 430 are formed of a buffer material or the like (nonwoven fabric, elastic body, etc.).

The sensor 300 is attached to the frame 500 below the load generating unit. When the sensor 300 is crushed by the key depression on the lower surface side of the hammer side load portion 210, the sensor 300 outputs a detection signal. As described above, the sensor 300 is provided corresponding to each key 100.

[Overview of load generation unit]
FIG. 4 is an explanatory diagram of a load generation unit (key side load unit and hammer side load unit) in the first embodiment. The hammer side load part 210 includes a moving member 211 (second member), a rib part 213, and a sensor driving part 215 (plate-like member). Each of these components is also connected to the hammer body 250. In this example, the moving member 211 has a columnar shape having a bottom surface obtained by joining two substantially semicircles having different radii and the same center, and the axis extends in the scale direction. The rib part 213 is a rib connected below the moving member 211. In this example, the normal direction of the surface is along the scale direction. The sensor drive unit 215 is a plate-like member that is connected below the rib portion 213 and has a normal surface in a direction perpendicular to the scale direction. That is, the sensor driving unit 215 and the rib portion 213 are in a vertical relationship. Here, the rib part 213 includes in the plane the direction of movement by pressing the key. Therefore, there is an effect of reinforcing the strength of the moving member 211 and the sensor driving unit 215 with respect to the moving direction at the time of key depression. Here, for the moving member 211, the rib portion 213 and the sensor driving portion 215 function as a reinforcing material. For the sensor driving unit 215, the moving member 211 and the rib portion 213 function as a reinforcing material. This makes it possible to reinforce each other and strengthen them as a whole rather than simply providing ribs. As shown in FIG. 4, the moving member 211 is connected to the front end portion of the hammer main body portion 250 via the rib portion 211. Further, as described above, the weight portion 230 is connected to the rear end portion of the hammer main body portion 250 (the back side from the rotation shaft). That is, the moving member 211 is located on the opposite side (front side) to the side (rear side) where the weight portion 230 is located with respect to the rotation axis of the hammer assembly 200.

The key side load part 120 includes a sliding surface forming part 121. As shown in FIG. 4, the sliding surface forming portion 121 is disposed at the lower end portion of the key-side load portion 120 that extends downward from the key 100. That is, the sliding surface forming portion 121 is disposed with respect to the key 100 at a position that moves downward when the key is pressed. The sliding surface forming part 121 forms a space SP in which the moving member 211 can move. A sliding surface FS is formed above the space SP, and a guide surface GS is formed below the space SP. At least the region where the sliding surface FS is formed is formed of an elastic body such as rubber. That is, this elastic body is exposed. In this example, the entire sliding surface forming part 121 is formed of an elastic body. It is desirable that this elastic body has viscoelasticity, that is, a viscoelastic body. Since the sliding surface forming portion 121 is an elastic body, the sliding surface forming portion 121 is surrounded by a material that is more difficult to deform, for example, a rigid body such as a resin having higher rigidity than the elastic body constituting the sliding surface forming portion 121. Thus, the outer surface of the sliding surface forming portion 121 is supported so as to be maintained. This outer surface includes the surface on the opposite side of the sliding surface FS in the sliding surface forming portion 121. In addition, it may change so that rigidity may become high gradually from the sliding surface FS to the rigid body of the outer surface side. In addition, it is desirable not to include a member that is more easily elastically deformed than the sliding surface FS (a member having rigidity lower than that of the sliding surface FS) during this period.

FIG. 4 shows the position of the moving member 211 when the key 100 is at the rest position. When the key is depressed, the moving member 211 moves the space SP in the direction of the arrow D1 (hereinafter sometimes referred to as the traveling direction D1) while being in contact with the sliding surface FS. That is, the moving member 211 slides with the sliding surface FS. In this example, the curved surface formed on the semicircular side having a large radius in the moving member 211 and the sliding surface FS come into contact with each other. Since the moving member 211 moves while contacting the sliding surface FS, the sliding surface FS may be referred to as an intermittent sliding side, and the moving member 211 may be referred to as a continuous sliding side. The moving member 211 is also rotated slightly to move the contact surface. Therefore, although it is not strictly continuous sliding, it can be said that it is almost continuous sliding. In any case, in the range in which the sliding surface FS and the moving member 211 slide along with the key depression, the entire range that can be contacted by the moving member 211 in the sliding surface FS is the sliding in the moving member 211. The area is larger than the entire range that can be contacted by the surface FS.

At this time, the entire load generating unit moves downward as the key is pressed, and the sensor driving unit 215 crushes the sensor 300. In this example, a stepped portion 1231 is arranged in the sliding surface FS in a range in which the moving member 211 moves when the key 100 rotates from the rest position to the end position. That is, the stepped portion 1231 is overcome by the moving member 211 (more specifically, the upper half cylinder 2111 described later of the moving member 211) that moves from the initial position (the position of the moving member 211 when the key 100 is at the rest position). It is done. A concave portion 1233 is formed in a portion of the guide surface GS that faces the stepped portion 1231. The presence of the recess 1233 makes it easier for the moving member 211 to move over the stepped portion 1231. Then, the structure of the sliding surface formation part 121 is explained in full detail.

[Configuration of sliding surface forming part]
FIG. 5 is a diagram illustrating the structure of the sliding surface forming portion in the first embodiment. FIG. 5A is a diagram for explaining the sliding surface forming portion 121 described in FIG. 4 in more detail, and its internal structure is indicated by a broken line. FIG. 5B is a view when the sliding surface forming portion 121 is viewed from the rear (key rear end side). FIG. 5C is a view when the sliding surface forming portion 121 is viewed from the upper surface side. FIG. 5D is a view when the sliding surface forming portion 121 is viewed from the lower surface side. FIG. 5E is a view when the sliding surface forming portion 121 is viewed from the front (key front end side). In addition, the area | region where the moving member 211 and the rib part 213 exist is shown with the dashed-two dotted line.

The sliding surface forming part 121 includes an upper member 1211 (first member), a lower member 1213 (third member), and a side member 1215. The upper member 1211 and the lower member 1213 are connected via a side member 1215. The space SP described above indicates a space surrounded by the upper member 1211, the lower member 1213, and the side member 1215. The surface on the space SP side of the upper member 1211 is a sliding surface FS. As described above, the stepped portion 1231 is disposed on the sliding surface FS. The space SP side surface of the lower member 1213 is a guide surface GS. As described above, the recess 1233 is disposed on the guide surface GS. The guide surface GS guides the moving member 211 so that the moving member 211 is not separated from the upper member 1211 (sliding surface FS) by a predetermined distance or more. That is, as shown in FIG. 4, the upper member 1211 is disposed below the key 100, and the lower member 1213 is disposed below the upper member 1211. Further, the lower member 1213 is disposed at a position where the moving member 211 is sandwiched between the lower member 1213 and the upper member 1211.

The lower member 1213 is provided with a slit 125. The slit 125 passes the rib portion 213 that moves together with the moving member 211. Although omitted in FIG. 5, as shown in FIG. 4, a sensor driving unit 215 is connected to the rib portion 213 on the side opposite to the moving member 211. Therefore, the lower member 1213 has a positional relationship between the moving member 211 and the sensor driving unit 215.

The guide surface GS of the lower member 1213 is inclined so as to approach the sliding surface FS as it approaches the slit 125. That is, the lower member 1213 includes a portion that protrudes linearly along the slit 125 (hereinafter referred to as a protruding portion P). According to such a protrusion P, the area when the moving member 211 contacts the guide surface GS is smaller than the area when the moving member 211 contacts the sliding surface FS. In this example, as shown in FIG. 8, the moving member 211 is separated from the guide surface GS when in contact with the sliding surface FS, and is separated from the sliding surface FS when in contact with the guide surface GS. As described above, the sliding surface FS is in contact with a curved surface formed on the semicircular side of the moving member 211 having a large radius. On the other hand, the curved surface formed in the semicircle side with a small radius among the moving members 211 contacts the guide surface GS. That is, when the moving member 211 approaches the guide surface GS, the lower half cylinder 2112 described later contacts the protrusion P. The moving member 211 may be configured to slide in contact with both the sliding surface FS and the guide surface GS in at least a part of the moving range. Moreover, in this example, although the protrusion part P was provided in the both sides of the slit 125, you may provide in either one side.

When pressing the key, force is applied to the moving member 211 from the sliding surface FS. The force transmitted to the moving member 211 rotates the hammer assembly 200 so as to move the weight portion 230 upward. At this time, the moving member 211 moves in the direction of the traveling direction D1 with respect to the sliding surface FS while being pressed below the sliding surface forming portion 121 and pressed against the sliding surface FS. On the other hand, when the key is released, the hammer assembly 200 is rotated by dropping the weight portion 230, and as a result, a force is applied upward from the moving member 211 to the sliding surface FS. Here, the moving member 211 is formed of a member that is less likely to be elastically deformed than the elastic body that forms the sliding surface FS (for example, a resin that has higher rigidity than the elastic body that forms the sliding surface FS). Yes. Therefore, the sliding surface FS is elastically deformed when the moving member 211 is pressed. As a result, the moving member 211 receives various resistances against movement in accordance with the pressing force. This resistance force will be described with reference to FIGS.

FIG. 6 is a diagram for explaining the elastic deformation (during hard hitting) of the elastic body in the first embodiment. FIG. 7 is a view for explaining elastic deformation (when weakly hit) of the elastic body in the first embodiment. By moving the key, the moving member 211 moves in the traveling direction D1. At this time, since the moving member 211 is pressed against the sliding surface FS of the upper member 1211, the upper member 1211 formed of an elastic body is deformed so that the sliding surface FS is recessed by elastic deformation.

At the point C1 on the surface of the moving member 211 on the traveling direction D1 side (hereinafter sometimes referred to as the front side of the moving member 211), in addition to the frictional force Ff1 with the upper member 1211, the repulsion pushed back from the upper member 1211. The force Fr1 becomes a resistance force with respect to the traveling direction D1. Further, at the point C2 on the surface of the moving member 211 opposite to the traveling direction D1 (hereinafter, sometimes referred to as the rear side of the moving member 211), the upper member when the key is weak (during weak hitting). On the other hand, when the key is strong (during a strong hit), it does not contact the upper member 1211 (FIG. 6).

The upper member 1211 is elastically deformed by the moving member 211, and the shape is restored after the moving member 211 passes. At the time of smashing, the moving member 211 moves faster than restoring. Therefore, the area where the moving member 211 and the upper member 1211 do not contact increases on the rear side of the moving member 211. As the viscosity of the upper member 1211 increases, an area where the moving member 211 does not contact increases even if the speed of the moving member 211 is the same.

It should be noted that the difference between the weak strike and the strong strike, that is, the difference in the key pressing force affects the size of the elastic deformation. On the other hand, regarding the size of the area where the moving member 211 and the upper member 1211 do not contact, the difference between the weak hit and the strong hit is directly related to the moving speed of the moving member 211 in detail. That is, if the key pressing speed is already high even if the key pressing force is weak, the area where the moving member 211 and the upper member 1211 do not come in contact increases. For example, when a key is pressed while swinging down a hand, a large force is applied at the beginning of the key press, but the force is quickly reduced and the amount of elastic deformation is reduced, and the moving member 211 approaches a constant velocity motion. On the other hand, since the moving speed of the moving member 211 remains high, it is difficult to receive a force from the rear side of the moving member 211 due to the influence of the viscosity of the upper member 1211, and is greatly influenced by the repulsive force Fr1 from the front side. Resistance to key pressing can be obtained.

When contacting the upper member 1211 on the rear side of the moving member 211, the moving member 211 receives a repulsive force Fr2 in addition to the frictional force Ff2. The frictional force Ff2 is a resistance force with respect to the traveling direction D1. On the other hand, the repulsive force Fr2 becomes a driving force with respect to the traveling direction D1. Further, since the amount of elastic deformation of the upper member 1211 is smaller as the hitting is weaker, the magnitude of the repulsive force Fr1 is smaller, and the contact area between the moving member 211 and the upper member 1211 is also reduced as a whole, and the frictional force is increased. It also decreases. Thus, the situation of FIG. 6 and the situation of FIG. 7 differ not only in the frictional force but also in the influence of the repulsive force. Therefore, according to these configurations, the resistance force that the moving member 211 receives in the traveling direction D1 can be changed in a complex manner depending on the strength and speed of the key depression. The resistance force received by the moving member 211 is also a resistance force applied to the key depression. As a result, it is possible to reproduce a change in the resistance force to the key depression in accordance with the key depression strength and speed in the acoustic piano. In addition, the upper member 1211 can be made to have various resistances to the key press by using a material that is elastically affected by acceleration (key press force) and has a viscosity that is greatly affected by speed (key press speed). It can also be designed.

Note that, depending on the strength of the key depression, when the key 100 reaches the end position, the moving member 211 may bounce to the sliding surface FS and collide with the guide surface GS. At this time, the protruding portion P of the guide surface GS may be elastically deformed so as to be crushed by the moving member 211. Due to the presence of the protrusion P, the contact area between the moving member 211 and the guide surface GS is smaller than the contact area between the moving member 211 and the sliding surface FS. Since the contact area is small, the guide surface GS is more easily elastically deformed than the sliding surface FS even when the same force is applied, and even if the moving member 211 collides with the guide surface GS, the moving member 211 does not slide. The occurrence of collision sound is suppressed compared to when the FS collides.

[Configuration of moving member]
FIG. 8 is a diagram illustrating the configuration of the moving member in the first embodiment. The moving member 211 includes an upper half cylinder 2111 and a lower half cylinder 2112. Since FIG. 8 shows the case where the moving member 211 is viewed in the scale direction, the bottom surfaces (two semicircles) of the upper half cylinder 2111 and the lower half cylinder 2112 are shown. In this example, the radius r1 of the cross section (semicircle) of the upper half cylinder 2111 is larger than the radius r2 of the cross section (semicircle) of the lower half cylinder 2112. Both semicircles have a common center CD. The cross section here refers to a cross section cut along a plane having the normal direction of the scale (the same applies to the following description). In other words, the center axis of the upper half cylinder 2111 (the axis extending in the direction parallel to the scale direction and passing through the common center CD) is the same as the center axis of the lower half cylinder 2112. Thus, it can be said that the upper half cylinder 2111 and the lower half cylinder 2112 have a common central axis. The upper half cylinder 2111 and the lower half cylinder 2112 are integrally formed of resin. However, the upper half cylinder 2111 and the lower half cylinder 2112 are separately formed, and both are integrated with an adhesive or the like. You may make it. Moreover, since the shape of the upper half cylinder 2111 and the lower half cylinder 2112 of the moving member 211 is a half cylinder formed by dividing the cylinder in half and is a part of the cylinder, terms including these are referred to as “partial cylinder shape”. Part ". When the “partial columnar portion” is used in this way, the upper half cylinder 2111 having a semi-cylindrical shape is an example of the first partial columnar shape portion, and the lower half cylinder 2112 having a half columnar shape is the second portion. It is an example of a cylindrical shape part. In addition, the “columnar shape” of the “partial columnar shape portion” is not limited to a columnar shape, and can be interpreted to include other shapes as long as the shape extends along the central axis. is there. For example, even a shape like a “conical frustum” extending along the central axis can be interpreted as being included in the “columnar shape”. When considered in this way, for example, a combination of a cylinder corresponding to the “first partial columnar shape portion” and a truncated cone corresponding to the “second partial columnar shape portion”, a reverse combination thereof, or a “first partial columnar shape” A combination of a truncated cone corresponding to the “part” and a truncated cone corresponding to the “second partial cylindrical portion” having an angle different from that of the truncated cone may be employed. Further, the “cylindrical shape” may include those in which the plane of the base of the truncated cone is not a flat surface but a curved surface such as a sphere. Further, when the “columnar shape” is interpreted in this way, the “first partial cylindrical shape portion” and the “second partial cylindrical shape portion” are respectively converted into the “first partial cone shape portion” and the “second partial cone shape portion”. It is also possible to correspond to “part”.

As described above, the moving member 211 is provided with the curved surface of the upper semi-cylinder 2111 (the curved surface 21111 (first curved surface) that is a semicircular arc (first arc) having a radius r1 in cross section) on the sliding surface FS side, and the lower side A curved surface of the semi-cylindrical 2112 (a curved surface 21121 (second curved surface) whose cross section is a semicircular arc (second arc) having a radius r2) is provided on the guide surface GS side. In other words, the radius of the upper half cylinder 2111 (distance between the curved surface 21111 and the center axis of the upper half cylinder 2111) is r1, and the radius of the lower half cylinder 2112 (distance between the curved surface 21121 and the center axis) is r2. . As shown in FIG. 8, when the key 100 is in the rest position (when the moving member 211 is in the initial position), the moving member 211 is in contact with the sliding surface FS at the position CP1 of the upper half cylinder 2111. Yes. As shown in FIG. 8, when the upper half cylinder 2111 of the moving member 211 is in contact with the sliding surface FS of the upper member 1211, the lower half cylinder 2112 of the moving member 211 is placed on the guide surface GS of the lower member 1213. There is no contact. On the other hand, when the key 100 is in the end position, the moving member 211 moves to the position indicated by the broken line. At this time, the moving member 211 slightly rotates, so that the position in contact with the sliding surface FS changes to the position CP2. Similarly in this case, when the upper half cylinder 2111 of the moving member 211 is in contact with the sliding surface of the upper member 1211, the lower half cylinder 2112 of the moving member 211 is in contact with the guide surface GS of the lower member 1213. Not. In FIG. 8, since the moving member 211 is in a stationary state, it is described that one point of the arc is in contact with the sliding surface FS, but in FIGS. As described above, the sliding surface FS may be elastically deformed during key pressing (while the moving member 211 is moving).

By forming the lower half cylinder 2112 of the moving member 211 smaller than the upper half cylinder 2111, the sliding surface FS and the guide surface GS are larger than the same size, that is, the moving member 211 is formed in a single column shape. Can be shortened. It is also conceivable that the moving member 211 is simply formed in a cylindrical shape, and the radius of the circle is reduced (the cylinder is thinned). However, in this case, since the amount of elastic deformation with respect to the sliding surface FS also changes, the resistance force against the key pressing also changes. In this example, by combining semi-cylinders having different radii, the distance between the sliding surface FS and the guide surface GS can be reduced while minimizing the parts while minimizing the influence on the resistance force. it can. As described above, by using a column shape including a plurality of arcs with different radii, it is possible to secure a greater degree of design freedom. Further, by sharing the center of the semicircle of each semi-cylinder, even if the moving member 211 rotates, if the distance between the sliding surface FS and the guide surface GS is constant, the lower semi-cylinder 2112 and The distance from the guide surface GS can be made constant.

[Keyboard assembly operation]
FIG. 9 is a diagram for explaining the operation of the key assembly when the key (white key) in the first embodiment is pressed. FIG. 9A is a diagram when the key 100 is in the rest position (a state where the key is not pressed). FIG. 9B is a diagram when the key 100 is in the end position (the state where the key is pressed to the end). When the key 100 is pressed, the rod-like flexible member 185 is bent with the center of rotation. At this time, the bar-shaped flexible member 185 is bent and deformed forward (frontward) of the key, but the key 100 does not move forward due to the restriction of movement in the front-rear direction by the side key guide 153. It turns in the pitch direction without. Then, when the key side load portion 120 pushes down the hammer side load portion 210, the hammer assembly 200 rotates around the rotation shaft 520. In the description of FIG. 9, FIGS. 4 and 5 are referred to for each configuration of the sliding surface forming portion 121 in the key side load portion 120.

At this time, since the weight part 230 moves upward, a force is applied so that the weight part 230 moves the key 100 in the direction (upward) to return the key 100 to the rest position. Further, in the load generation unit (the key side load unit 120 and the hammer side load unit 210), the moving member 211 elastically deforms the upper member 1211 when moving while in contact with the sliding surface FS. You will receive various resistance depending on the method. This resistance force and the weight of the weight portion 230 appear as a load on the key depression. Further, when the moving member 211 gets over the stepped portion 1231, a click feeling is transmitted to the key 100.

When the weight 230 collides with the upper stopper 430, the rotation of the hammer assembly 200 is stopped and the key 100 reaches the end position. When the sensor 300 is crushed by the sensor driving unit 215, the sensor 300 outputs a detection signal at a plurality of stages according to the crushed amount (key pressing amount).

On the other hand, when the key is released, the weight assembly 230 moves downward, and the hammer assembly 200 rotates. As the hammer assembly 200 rotates, the key 100 rotates upward via the load generating portion. When the weight 230 comes into contact with the lower stopper 410, the rotation of the hammer assembly 200 is stopped and the key 100 returns to the rest position. At this time, the moving member 211 returns to the initial position.

Second Embodiment
In the second embodiment, a moving member 211A in which the upper half cylinder is smaller than the lower half cylinder will be described.

FIG. 10 is a diagram illustrating a moving member in the second embodiment. In this example, the radius r1 of the cross section (semicircle) of the upper half cylinder 2111A is smaller than the radius r2 of the cross section (semicircle) of the lower half cylinder 2112A. Both semicircles have a common center CD. Also in this embodiment, the curved surface 2111A1 (an example of the first curved surface) that is the outer peripheral surface of the upper half cylinder 2111A slides on the sliding surface FS, and the curved surface 2112A1 (the outer peripheral surface of the lower half cylinder 2112A). An example of the second curved surface is guided by the guide surface GS. At this time, the radius r1 is assumed to be the same in the first embodiment and the second embodiment in order to make the resistance force at the time of key depression in the first embodiment and the second embodiment the same. If it does in this way, since the magnitude | size of a sliding surface formation part can be enlarged, the precision of the metal mold | die at the time of shaping | molding can be made high.

On the other hand, in order to obtain the effect of increasing the elastic deformation of the sliding surface FS, the radius r1 can be made smaller in the upper half cylinder 2111A of the second embodiment than in the upper half cylinder 2111 of the first embodiment. is there. Although it is conceivable that the moving member 211A is simply formed in a cylindrical shape and the radius of the circle is reduced (thinning the cylinder), in this case, since the moving member 211A becomes thin, the radius r2 is set larger than the radius r1. Thus, the strength of the moving member 211A can be improved. As described above, by using a column shape including a plurality of arcs with different radii, it is possible to secure a greater degree of design freedom. Note that the radius r2 of the cross section of the lower half cylinder 2112A may be the same as the radius r1 of the cross section of the upper half cylinder 2111 in the first embodiment.

<Third Embodiment>
In the first embodiment, the moving member 211 is formed by combining two semicircles in cross section, but it does not necessarily have to be a semicircle. In 3rd Embodiment, it illustrates about the moving

members

211B and 211C which have cross sections other than the combination of two semicircles.

FIG. 11 is a diagram for explaining a moving member in the third embodiment. A moving member 211B shown in FIG. 11A includes an upper partial cylinder 2111B and a lower partial cylinder 2112B. Also in this embodiment, the curved surface 2111B1 (an example of the first curved surface) that is the outer circumferential surface of the upper half cylinder 2111B slides on the sliding surface FS, and the curved surface 2112B1 (the outer circumferential surface of the lower half cylinder 2112B). An example of the second curved surface is guided by the guide surface GS. The central angle AG of the cross section (sector shape) of the upper partial cylinder 2111B is less than 180 degrees. On the other hand, since the central angle of the lower partial cylinder 2112B is an angle obtained by subtracting the central angle AG from 360 degrees as shown in the figure, it is larger than 180 degrees. At this time, the curved surface of the upper partial cylinder 2111B and the sliding surface FS (including the stepped portion 1231) are in contact with each other in the range that can contact the sliding surface FS of the moving member 211B (the moving range of the moving member 211B). The center angle AG may be determined. For example, if the central angle AG becomes too small, the curved surface portion of the upper partial cylinder 2111B and the sliding surface FS may not come into contact with each other, and such a range is excluded. Further, the end EGD of the upper partial cylinder 2111B on the traveling direction D1 side is prevented from coming into contact with the sliding surface FS including the stepped portion 1231 even when the sliding surface FS is elastically deformed, that is, on the upper side It is desirable that the curved portion of the partial cylinder 2111B and the sliding surface FS are in contact with each other.

On the other hand, in the moving member 211C shown in FIG. 11B, the central angle AG of the cross section of the upper partial cylinder 2111C is larger than 180 degrees. On the other hand, since the central angle of the lower partial cylinder 2112C is an angle obtained by subtracting the central angle AG from 360 degrees as shown in the drawing, it is larger than 180 degrees. In this case, the central angle AG is determined so that both ends of the upper partial cylinder 2111C do not contact the guide surface GS. That is, when the central angle AG is large, the end portion EG of the upper partial cylinder 2111C is more likely to contact the guide surface GS as the size of the radius r2 is smaller than the radius r1.

<Fourth embodiment>
In said embodiment, although the moving member was formed by the combination of two partial cylinders, structures other than two partial cylinders may be included. That is, the cross section of the moving member may further include other shapes as long as it includes an arc disposed on the sliding surface FS side and an arc disposed on the guide surface GS side. In the fourth embodiment, three moving

members

211D, 211E, and 211F are illustrated.

FIG. 12 is a diagram for explaining a moving member in the fourth embodiment. A moving member 211D shown in FIG. 12A includes an upper partial cylinder 2111D and a lower partial cylinder 2112D. Also in the present embodiment, the curved surface 2111D1 (an example of the first curved surface) that is the outer circumferential surface of the upper half cylinder 2111D slides on the sliding surface FS, and the curved surface 2112D1 (the outer circumferential surface of the lower half cylinder 2112D). An example of the second curved surface is guided by the guide surface GS. The central angle AG1 of the upper partial cylinder 2111D and the central angle AG2 of the lower partial cylinder 2112D are both less than 180 degrees. Therefore, the moving member 211D includes side structures that connect the respective side portions of the upper partial cylinder 2111D and the lower partial cylinder 2112D in addition to the upper partial cylinder 2111D and the lower partial cylinder 2112D. The side structure has a convex side surface. This side surface connects the curved surface of the upper partial cylinder 2111D and the curved surface of the lower partial cylinder 2112D.

The moving member 211E shown in FIG. 12B is an example in the case where the side structure connecting the side portions of the upper partial cylinder 2111E and the lower partial cylinder 2112E has a concave side surface. Also in this embodiment, the curved surface 2111E1 (an example of the first curved surface) that is the outer peripheral surface of the upper half cylinder 2111E slides on the sliding surface FS, and the curved surface 2112E1 (the outer peripheral surface of the lower half cylinder 2112E). An example of the second curved surface is guided by the guide surface GS. In this case, the curved surface of the upper partial cylinder 2111E and the side surface of the side structure are discontinuously connected at both ends of the upper partial cylinder 2111E and the lower partial cylinder 2112E, and the curved surface and the side part of the lower partial cylinder 2112E are connected. The side surface of the structure is connected discontinuously.

In the moving member 211F shown in FIG. 12C, the shape of the side structure connecting the respective side portions of the upper partial cylinder 2111F and the lower partial cylinder 2112F is different between the traveling direction D1 side and the opposite side. ing. In particular, in the traveling direction D1, the curved surface of the upper partial cylinder 2111F and the side surface of the side structure are continuously connected. Further, the upper partial cylinder 2111F is arranged at a position rotated to the traveling direction D1 side as compared with the above example. That is, among the angles AG3 and AG4 formed by the side portion of the upper partial cylinder 2111F and the side portion of the lower partial cylinder 2112F, the angle AG3 on the traveling direction D1 side is smaller than the angle AG4. As in the above example, the angles AG3 and AG4 may be the same size. Also in the present embodiment, the curved surface 2111F1 (an example of the first curved surface) that is the outer circumferential surface of the upper half cylinder 2111F slides on the sliding surface FS, and the curved surface 2112F1 (the outer circumferential surface of the lower half cylinder 2112F). An example of the second curved surface is guided by the guide surface GS.

<Fifth Embodiment>
In the fifth embodiment, the key 100 and the key-side load unit 120 are indirectly connected.

FIG. 13 is a diagram schematically illustrating the connection relationship between the keys of the keyboard assembly and the hammer according to the fifth embodiment. FIG. 13 schematically shows the relationship between the key, the weight, and the load generation unit. FIG. 13A is a diagram when the key 100J is at the rest position (before the key is pressed). FIG. 13B is a diagram when the key 100J is in the end position (after the key is pressed).

The key 100J rotates around CF1. CF1 corresponds to, for example, the rod-shaped flexible member 185 according to the above-described embodiment. The key side load unit 120J and the key 100J are connected via a structure 1201J. The structure 1201J rotates around CF3. One end of the structure 1201J is rotatably connected to the key 100J via the link mechanism CK1. The other end of the structure 1201J is connected to the key-side load unit 120J. The hammer main body 250E rotates around the CF2. CF2 corresponds to the pivot shaft 520 according to the above-described embodiment. The weight portion 230J is disposed between the CF2 and the hammer side load portion 210J.

Thus, when the key is depressed, the key side load portion 120J moves inside the hammer side load portion 210J, and raises the weight portion 230J until it collides with the upper stopper 430J. That is, the state changes from the state shown in FIG. 13A to the state shown in FIG. On the other hand, when the key is released, the weight portion 230J descends and pushes up the key 100J until it collides with the lower stopper 410J. That is, the state changes from the state shown in FIG. 13B to the state shown in FIG. As described above, if the load generating portion exists in the force transmission path from the key to the hammer assembly, even if at least one of the key and the hammer assembly is directly connected to the load generating portion, it is indirect. It may be connected to the terminal, and various configurations are possible.

<Modification>
Although one embodiment of the present invention has been described above, the present invention can be implemented in various modes as follows.

(1) In the above-described embodiment, the sensor driving unit 215 is connected to the moving member 211 via the rib portion 213, but the rib portion 213 may not be present. In this case, the moving member 211 and the sensor driving unit 215 may be connected to the hammer main body 250. In this case, the slit 125 may not be formed in the lower member 1213.

(2) In the embodiment described above, the entire sliding surface forming part 121 is formed of an elastic body, but this is not a limitation. For example, the elastic body may be disposed in the entire region where the sliding surface FS is formed. Moreover, only the protrusion part formed in the guide surface GS may be formed with the elastic body. In order to obtain the resistance against the key depression described in the first embodiment, the range of the sliding surface FS that can be contacted by the moving member 211 is formed of at least an elastic body in the entire movable range of the key 100. It is desirable. Note that all of the sliding surface forming portion 121 may be formed of a member other than the elastic body.

(3) In the embodiment described above, the key side load portion 120 including the sliding surface FS is connected to the key 100, and the hammer side load portion 210 including the moving member 211 is connected to the hammer assembly 200. The relationship may be reversed. Specifically, when the reverse relationship is established, the sliding surface FS is formed in the hammer side load portion 210, and the moving member 211 is provided in the key side load portion 120. That is, one of the moving member 211 and the sliding surface FS only needs to be connected to the key 100 and the other connected to the hammer assembly 200.

(4) The lower member 1213 (guide surface GS) may not have a partial region. It is desirable to leave the guide surface GS in a region where the moving member 211 easily collides with the guide surface GS. For example, immediately after the key 100 is pressed down to the end position, the hammer assembly 200 continues to rotate with inertial force, and the moving member 211 is easily separated from the sliding surface FS. Further, immediately after the key 100 returns to the rest position, the hammer member 200 may continue to rotate with inertial force, and the moving member 211 may collide with the sliding surface FS and bounce off. In these situations, the moving member 211 easily comes into contact with the guide surface GS. That is, the guide surface GS is desirably disposed at least at both ends of the moving range of the moving member 211.

(5) In the above-described embodiment, the protruding portion P is arranged on the lower member 1213, but the protruding portion P may not be arranged. In this case, the guide surface GS may be a surface parallel to the sliding surface FS.

(6) The stepped portion 1231 may not exist on the sliding surface FS. In this case, it is desirable to generate a click feeling using another method. At least in the load generating unit, it is not necessary to generate a click feeling. Even if the click feeling is not generated, it is possible to apply a resistance force against the key depression by using the elastic deformation of the sliding surface FS at the load generating portion.

DESCRIPTION OF SYMBOLS 1 ... Keyboard device, 10 ... Keyboard assembly, 70 ... Sound source device, 80 ... Speaker, 90 ... Case, 100, 100J ... Key, 100w ... White key, 100b ... Black key, 120, 120J ... Key side load part, 1201J ... Structure, 121 ... Sliding surface forming portion, 1211 ... Upper member, 1213 ... Lower member, 1215 ... Side member, 1231 ... Step portion, 1233 ... Recess, 125 ... Slit, 151 ... Front end key guide, 153 ... Side key Guide, 180 ... connection part, 181 ... plate-like flexible member, 183 ... key-side support part, 185 ... rod-like flexible member, 200 ... hammer assembly, 210, 210J ... hammer side load part, 211, 211A, 211B , 211C, 211D, 211E, 211F ... moving member, 2111, 2111A, 2111B, 2111C, 2111D, 2111E, 2111F ... upper half Pillar, 2112, 2112A, 2112B, 2112C, 2112D, 2112E, 2112F ... lower half cylinder, 213 ... rib part, 215 ... sensor drive part, 220 ... shaft support part, 230, 230J ... weight part, 250, 250J ... hammer Main body part, 300 ... sensor, 410, 410E ... lower stopper, 430,430J ... upper stopper, 500 ... frame, 511 ... front end frame guide, 513 ... side frame guide, 520 ... rotating shaft, 585 ... frame side support part 710 ... Signal conversion unit 730 ... Sound source unit 750 ... Output unit

Claims

A key arranged to be rotatable relative to the frame;
A hammer assembly rotatably arranged in accordance with the rotation of the key;
A first member;
When the hammer assembly is rotated according to the rotation of the key, the hammer assembly is arranged to slide on the first member and move on the first member. A first curved surface having a circular arc, a second curved surface having a second circular arc in cross section on the opposite side of the first member, the first circular arc and the second circular arc having the same center and having a radius of each other A different second member;
A third member connected to the first member and guiding the second member so as not to be separated from the first member by a predetermined distance;
A keyboard device comprising:
The keyboard device according to claim 1, wherein the third member contacts the second curved surface in at least a part of a movement range of the second member.
3. The keyboard device according to claim 1, wherein a radius of the first arc is larger than a radius of the second arc.
The keyboard device according to claim 1 or 2, wherein a radius of the first arc is smaller than a radius of the second arc.
5. The keyboard device according to claim 1, wherein an elastic body is disposed on at least a part of a surface of the first member.
6. The keyboard device according to claim 1, wherein a position of the first curved surface in contact with the first member varies depending on a position of the second member with respect to the first member.
The keyboard device according to any one of claims 1 to 6, wherein the third member slides with the second member when the hammer assembly rotates in accordance with the rotation of the key.
The second member is
A first partial cylindrical portion having the first curved surface;
A second partial columnar part located on the opposite side of the first partial cylindrical part and having the second curved surface;
The first partial cylindrical portion and the second cylindrical portion have a common central axis,
The keyboard device according to any one of claims 1 to 7, wherein a radius of the first partial cylindrical portion is different from a radius of the second partial cylindrical portion.
9. The keyboard apparatus according to claim 1, wherein one of the first member and the second member is connected to the key, and the other is connected to the hammer assembly.
The hammer assembly includes a weight portion,
The first member is configured to force the second member to move upward while allowing the second member to slide relative to the first member when the key is pressed. The keyboard device according to any one of claims 1 to 9, wherein:
The first member is arranged with respect to the key at a position that moves downward by a key pressing operation on the key,
The second member is connected to the hammer assembly, and the weight is moved with respect to the rotation axis of the hammer assembly so that the weight is moved upward by being pushed downward from the first member. The keyboard device according to claim 10, wherein the keyboard device is connected to the opposite side of the unit.
12. The keyboard apparatus according to claim 11, wherein the third member is disposed with respect to the key at a position where the second member is sandwiched between the third member and the first member.
A key arranged to be rotatable relative to the frame;
A hammer assembly rotatably arranged in accordance with the rotation of the key;
A first member;
A first partial cylindrical portion having a first curved surface that slides with the first member when the hammer assembly rotates in response to the rotation of the key, and a second located on the opposite side of the first member. A second member comprising a second partial cylindrical portion having a curved surface;
A third member connected to the first member and guiding the second member so as not to be separated from the first member by a predetermined distance or more,
The first partial columnar portion and the second partial columnar portion have a common central axis,
A keyboard device in which a radius of the first partial cylindrical portion is different from a radius of the second partial cylindrical portion.
14. The keyboard device according to claim 13, wherein the third member contacts the second curved surface in at least a part of a movement range of the second member.
The keyboard device according to claim 13 or 14, wherein a radius of the first partial cylindrical portion is larger than a radius of the second partial cylindrical portion.
The keyboard device according to claim 13 or 14, wherein a radius of the first partial cylindrical portion is smaller than a radius of the second partial cylindrical portion.
The keyboard device according to any one of claims 13 to 16, wherein the first partial columnar portion and the second partial columnar portion are integrally formed of resin.
The first member includes a sliding surface that comes into contact with the first curved surface that is an outer peripheral surface of the first partial cylindrical portion,
The keyboard device according to any one of claims 13 to 17, wherein the third member includes a guide surface that can come into contact with the second curved surface that is an outer peripheral surface of the second partial cylindrical portion.