JP6822476B2 - Keyboard device - Google Patents

Description

The present invention relates to a keyboard device.

In an acoustic piano, a predetermined sensation (hereinafter referred to as a touch sensation) is given to a performer's finger through a key by the operation of an action mechanism. In particular, the operation of the escapement mechanism gives the performer's finger a collision feeling according to the key pressing speed and a subsequent omission feeling (as a whole, for example, a click feeling) as a touch feeling. Acoustic pianos require an action mechanism for striking strings with a hammer. On the other hand, in an electronic keyboard instrument, since the key press is detected by a sensor, it is possible to pronounce 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 greatly changes with respect to the touch feeling of an acoustic piano. Therefore, in an electronic keyboard instrument, various methods have been studied in order to obtain a touch feeling close to that of an acoustic piano (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2013-167790

In electronic keyboard instruments, it is necessary to introduce various mechanisms in order to obtain a touch feeling close to that of an acoustic piano, but the degree of freedom in design is decreasing due to the limited space for that purpose.

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

According to an embodiment of the present invention, a key rotatably arranged with respect to a frame, a hammer assembly rotatably arranged in response to the rotation of the key, a first member, and the key. When the hammer assembly rotates in response to rotation, it slides on the first member and is arranged so as to move on the first member, and the cross section becomes a first arc on the first member side. A second member having a first curved surface and a second curved surface having a second arc in cross section on the opposite side of the first member, the first arc and the second arc having the same center and different radii. And a keyboard device including a third member that connects to the first member and guides the second member so as not to be separated from the first member by a predetermined distance or more.

The third member may come into contact with the second curved surface in at least a part of the moving 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.

An elastic body may be arranged 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 the rotation of the key.
Further, 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 cylinder portion and the second cylindrical portion may have a common central axis, and the radius of the first partial cylinder portion may be different from the radius of the second partial cylinder 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 with respect to the first member when the key is pressed, and the weight portion is provided. A force may be applied to the second member so that the second member moves upward.
Further, the first member is arranged with respect to the key at a position where the key is moved downward by a key pressing operation on the key, and the second member is connected to the hammer assembly. It may be connected to the side opposite to the weight portion with respect to the rotation axis of the hammer assembly so that the weight portion moves upward by being pushed downward from the first member.
Further, the third member may be arranged 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 rotatably arranged with respect to the frame, a hammer assembly rotatably arranged according to the rotation of the key, a first member, and rotation of the key. A second having a first partial cylindrical portion having a first curved surface that slides with the first member when the hammer assembly rotates according to the above, and a second curved surface having a second curved surface located on the opposite side of the first member. A second member including a partially cylindrical portion, and a third member connected to the first member and guided so that the second member is not separated from the first member by a predetermined distance or more. The one-part cylindrical shape portion and the second partial cylindrical shape portion have a common central axis, and the radius of the first partial cylindrical shape portion may be different from the radius of the second partial cylindrical shape portion. ..
Further, the third member may come into contact with the second curved surface in at least a part of the moving range of the second member.
Further, the radius of the first partial cylindrical portion may be larger than the radius of the second partial cylindrical portion.
Further, the radius of the first partial cylindrical portion may be smaller than the radius of the second partial cylindrical portion.
Further, the first partial cylindrical portion and the second partial cylindrical portion may be integrally formed of the resin.
Further, the first member includes a sliding surface that contacts the first curved surface, which is the outer peripheral surface of the first partial cylindrical portion, and the third member is an outer peripheral surface of the second partial cylindrical portion. A guide surface that can come into contact with the second curved surface may be provided.

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

It is a figure which shows the structure of the keyboard device in 1st Embodiment. It is a block diagram which shows the structure of the sound source apparatus in 1st Embodiment. It is explanatory drawing when the structure of the inside of the housing in 1st Embodiment is seen from the side. It is explanatory drawing of the load generation part (the key side load part and the hammer side load part) in 1st Embodiment. It is a figure explaining the structure of the sliding surface forming part in 1st Embodiment. It is a figure explaining elastic deformation (at the time of a bang) of an elastic body in 1st Embodiment. It is a figure explaining elastic deformation (at the time of a weak hit) of an elastic body in 1st Embodiment. It is a figure explaining the structure of the moving member in 1st Embodiment. It is a figure explaining the operation of the key assembly at the time of pressing a key (white key) in 1st Embodiment. 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 schematically explains the connection relationship between the key of the keyboard assembly and the hammer in 5th Embodiment.

Hereinafter, the keyboard device according to the embodiment of the present invention will be described in detail with reference to the drawings. The embodiments shown below are examples of embodiments of the present invention, and the present invention is not construed as being limited to these embodiments. In the drawings referred to in the present embodiment, the same part or a part having a similar function is given the same code or a similar code (a code in which A, B, etc. are simply added after the numbers), and the process is repeated. The description of may be omitted. In addition, the dimensional ratios in the drawings (ratio between configurations, ratios in the vertical, horizontal, and height directions, etc.) may differ from the actual ratios for convenience of explanation, or some of the configurations may be omitted from the drawings.

<First Embodiment>
[Keyboard device configuration]
FIG. 1 is a diagram showing a configuration of a keyboard device according to the first embodiment. In this example, the keyboard device 1 is an electronic keyboard instrument such as an electronic piano that sounds in response to a key pressed by a user (performer). 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 press. In this case, the keyboard device 1 does not have to include a 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 the scale direction. When the white key 100w and the black key 100b can be explained without particular distinction, they may be referred to as the key 100. Also in the following description, when "w" is added to the end of the code, 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, the portion of the keyboard assembly 10 covered by the housing 90 is referred to as the non-appearance portion NV, and the portion exposed from the housing 90 and visible to the user is referred to as the appearance portion PV. .. That is, the appearance portion PV is a part of the key 100 and indicates an area where the user can perform a performance operation. Hereinafter, the portion of the key 100 exposed by the appearance portion PV may be referred to as a key body portion.

A sound source device 70 and a speaker 80 are arranged inside the housing 90. The sound source device 70 generates a sound wave signal when the key 100 is pressed. The speaker 80 outputs the sound wave signal generated by 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 the tone color, a display for displaying various information, and the like.

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

FIG. 2 is a block diagram showing a configuration of a 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 the operation of the key, and outputs a signal according to the detected content. In this example, the sensor 300 outputs a signal according to the amount of key presses in three stages. The key press 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 key 100 of 88), and operates according to the operation state of each key 100. Generates and outputs a signal. In this example, the operation signal is a MIDI format signal. Therefore, the signal conversion unit 710 outputs a note-on in response to the key press 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 note-on. On the other hand, in response to the key release operation, the signal conversion unit 710 outputs the key number and the 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 wave type signal based on the operation signal output from the signal conversion unit 710. The output unit 750 outputs a sound wave signal generated by the sound source unit 730. This sound wave signal is output to, for example, a speaker 80 or a sound wave signal output terminal.

[Keyboard assembly configuration]
FIG. 3 is an explanatory view of the configuration inside the housing according to the first embodiment when 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 (connection portion 180 and frame 500) and the speaker 80. The speaker 80 is arranged on the back side of the keyboard assembly 10. The speaker 80 is arranged so as to output a sound corresponding to a key press toward the upper side and the lower side of the housing 90. The sound output downward proceeds 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 external from the gap between the adjacent keys 100 or the gap between the key 100 and the housing 90 in the appearance portion PV. Proceed to. 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) is exemplified as the path SR.

The configuration of the keyboard assembly 10 will be described with reference to FIG. In addition to the key 100 described above, the keyboard assembly 10 includes a connection portion 180, a hammer assembly 200, and a frame 500. The keyboard assembly 10 is a resin structure whose structure is mostly manufactured by injection molding or the like. The frame 500 is fixed to the housing 90. The connecting portion 180 rotatably connects the key 100 to the frame 500. The connecting portion 180 includes a plate-shaped flexible member 181, a key-side support portion 183, and a rod-shaped flexible member 185. The plate-shaped 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-shaped flexible member 181. The 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 arranged between the key 100 and the frame 500. The bending of the rod-shaped flexible member 185 allows the key 100 to rotate with respect to the frame 500. The rod-shaped flexible member 185 is configured to be detachable from the key-side support portion 183 and the frame-side support portion 585. The rod-shaped flexible member 185 may be configured so that it cannot be attached or detached together with the key side support portion 183 and the frame side support portion 585, or by adhesion 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 contacted with the front end frame guide 511 of the frame 500 covered. The front end key guide 151 is in contact with the front end frame guide 511 on both the upper and lower sides in the scale direction. The side key guide 153 is in slidable contact with the side frame guide 513 on both sides in the scale direction. In this example, the side key guide 153 is arranged in a region of the side surface of the key 100 corresponding to the non-appearing portion NV, and is located closer to the front end of the key than the connecting portion 180 (plate-shaped flexible member 181). It may be arranged in the region corresponding to the appearance portion PV.

Further, the key 100 is connected to the key side load portion 120 below the appearance portion PV. The key-side load unit 120 is connected to the hammer assembly 200 so as to rotate the hammer assembly 200 when the key 100 rotates.

The hammer assembly 200 is arranged in the space below the key 100 and is rotatably attached to the frame 500. The hammer assembly 200 includes a weight portion 230 and a hammer body portion 250. A shaft support portion 220 serving as a bearing for the rotation shaft 520 of the frame 500 is arranged on the hammer main body portion 250. The shaft support portion 220 and the rotation shaft 520 of the frame 500 are slidably contacted 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 unit 210 includes a portion (moving member 211 to be described later; see FIG. 4) that is slidably contacted in the front-rear direction inside the key-side load unit 120. A lubricant such as grease may be arranged in this 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 a "load generation unit") are slid with each other to generate a part of the load at the time of key pressing. To do. In this example, the load generating portion is located below the key 100 in the appearance portion PV (front of the rear end of the key body portion). The detailed structure of the load generating part will be described later.

The weight portion 230 includes a metal weight and is connected to the rear end portion (rear side of the rotation shaft) of the hammer main body portion 250. In the normal state (when the key is not 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 pressed, the weight portion 230 moves upward and collides with the upper stopper 430. As a result, the end position that is the maximum amount of key press of the key 100 is defined. The weight portion 230 also applies a load to the key press. The lower stopper 410 and the upper stopper 430 are made of a cushioning material or the like (nonwoven fabric, elastic body, etc.).

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

[Overview of load generator]
FIG. 4 is an explanatory diagram of a load generating unit (key side load unit and hammer side load unit) according to the first embodiment. The hammer-side load portion 210 includes a moving member 211 (second member), a rib portion 213, and a sensor driving portion 215 (plate-shaped member). Each of these configurations is also connected to the hammer main body 250. In this example, the moving member 211 has a pillar shape having a bottom surface formed by connecting two substantially semicircles having different radii and having the same center, and its axis extends in the scale direction. The rib portion 213 is a rib connected below the moving member 211, and in this example, the normal direction of the surface thereof is along the scale direction. The sensor drive unit 215 is a plate-like member connected below the rib unit 213 and having a surface having a normal line in a direction perpendicular to the scale direction. That is, the sensor drive unit 215 and the rib unit 213 are in a vertical relationship. Here, the rib portion 213 includes the direction of movement by pressing the key in the plane. Therefore, it has the effect of reinforcing the strength of the moving member 211 and the sensor driving unit 215 with respect to the moving direction when the key is pressed. Here, the rib portion 213 and the sensor drive portion 215 function as reinforcing materials for the moving member 211. For the sensor drive unit 215, the moving member 211 and the rib portion 213 function as reinforcing materials. This also allows them to reinforce each other and strengthen 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 (back side of the rotation shaft) of the hammer main body portion 250. That is, the moving member 211 is located on the side (front side) opposite to the side (rear side) where the weight portion 230 is located with respect to the rotation shaft of the hammer assembly 200.

The key-side load portion 120 includes a sliding surface forming portion 121. As shown in FIG. 4, the sliding surface forming portion 121 is arranged at the lower end portion of the key side load portion 120 extending downward from the key 100. That is, the sliding surface forming portion 121 is arranged with respect to the key 100 at a position where it moves downward when the key is pressed. Further, the sliding surface forming portion 121 forms a space SP in which the moving member 211 can move. The sliding surface FS is formed above the space SP, and the 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 portion 121 is formed of an elastic body. It is desirable that this elastic body has viscoelasticity, that is, it is a viscoelastic body. Since the sliding surface forming portion 121 is an elastic body, it is surrounded by a material that is less likely to be deformed, for example, a rigid body such as a resin having a higher rigidity than the elastic body constituting the sliding surface forming portion 121. As a result, the shape of the outer surface of the sliding surface forming portion 121 is maintained. This outer surface includes a surface of the sliding surface forming portion 121 on the opposite side of the sliding surface FS. The area from the sliding surface FS to the rigid body on the outer surface side may be changed so that the rigidity gradually increases. Further, during this period, it is desirable that a member that is more easily elastically deformed than the sliding surface FS (a member having a lower rigidity than the sliding surface FS) is not included.

FIG. 4 shows the position of the moving member 211 when the key 100 is in the rest position. When the key is pressed, the moving member 211 moves the space SP in the direction of the arrow D1 (hereinafter, may be referred to as the traveling direction D1) while contacting the sliding surface FS. That is, the moving member 211 slides on the sliding surface FS. In this example, the curved surface of the moving member 211 formed on the semicircular side having a large radius comes into contact with the sliding surface FS. 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. Since the moving member 211 also rotates slightly to move the contact surface, it can be said that the moving member 211 is not strictly continuous sliding, but is substantially continuous sliding. In any case, in the range in which the sliding surface FS and the moving member 211 slide with the key press, the entire range of the sliding surface FS that can be contacted by the moving member 211 is the sliding of the moving member 211. The area is larger than the entire range that can be contacted by the surface FS.

At this time, the load generating unit as a whole moves downward as the key is pressed, and the sensor driving unit 215 crushes the sensor 300. In this example, in the sliding surface FS, the step portion 1231 is arranged in the range in which the moving member 211 moves by rotating the key 100 from the rest position to the end position. That is, the step portion 1231 is overcome by the moving member 211 (more specifically, the upper semi-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 in the rest position). Be done. Further, a recess 1233 is formed in a portion of the guide surface GS facing the step portion 1231. The presence of the recess 1233 makes it easier for the moving member 211 to move over the stepped portion 1231. Subsequently, the configuration of the sliding surface forming portion 121 will be described in detail.

[Structure of sliding surface forming part]
FIG. 5 is a diagram for explaining 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 above in more detail, and the internal structure thereof is shown by a broken line. FIG. 5B is a view when the sliding surface forming portion 121 is viewed from the rear (rear end side of the key). FIG. 5C is a view of the sliding surface forming portion 121 as viewed from the upper surface side. FIG. 5D is a view of the sliding surface forming portion 121 as viewed from the lower surface side. FIG. 5 (E) is a view when the sliding surface forming portion 121 is viewed from the front (key front end side). The region where the moving member 211 and the rib portion 213 are present is indicated by a chain double-dashed line.

The sliding surface forming portion 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 the 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 of the upper member 1211 on the space SP side is a sliding surface FS. As described above, the step portion 1231 is arranged on the sliding surface FS. The surface of the lower member 1213 on the space SP side is a guide surface GS. As described above, the recess 1233 is arranged on the guide surface GS. The guide surface GS guides the moving member 211 so that the moving member 211 does not separate 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 arranged below the key 100, and the lower member 1213 is arranged below the upper member 1211. Further, the lower member 1213 is arranged at a position where the moving member 211 is sandwiched between the lower member 1213 and the upper member 1211.

A slit 125 is arranged in the lower member 1213. The slit 125 passes through the rib portion 213 that moves together with the moving member 211. Although omitted in FIG. 5, as shown in FIG. 4, a sensor drive 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 of being sandwiched 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 (hereinafter, referred to as a protruding portion P) that projects linearly along the slit 125. According to such a protruding portion P, the area when the moving member 211 comes into contact with the guide surface GS is smaller than the area when the moving member 211 comes into contact with the sliding surface FS. In this example, as shown in FIG. 8, the moving member 211 is separated from the guide surface GS when it is in contact with the sliding surface FS, and is separated from the sliding surface FS when it is in contact with the guide surface GS. As described above, the sliding surface FS is in contact with the curved surface of the moving member 211 formed on the semicircular side having a large radius. On the other hand, the curved surface of the moving member 211 formed on the semicircular side having a small radius comes into contact with the guide surface GS. That is, when the moving member 211 approaches the guide surface GS, the lower semi-cylinder 2112 described later comes into contact with the protrusion P. The moving member 211 may be adapted to slide in contact with both the sliding surface FS and the guide surface GS in at least a part of the moving range. Further, in this example, the protrusions P are provided on both sides of the slit 125, but they may be provided on either side.

When the key is pressed, a 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 traveling direction D1 with respect to the sliding surface FS while being pushed downward from 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 rotates due to the weight portion 230 falling, 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 forming the sliding surface FS (for example, a resin having higher rigidity than the elastic body forming the sliding surface FS). There is. Therefore, the sliding surface FS is elastically deformed when the moving member 211 is pressed against it. As a result, the moving member 211 receives various resistance forces against movement depending on the pressing force. This resistance force will be described with reference to FIGS. 6 and 7.

FIG. 6 is a diagram illustrating elastic deformation (during a bang) of the elastic body in the first embodiment. FIG. 7 is a diagram illustrating elastic deformation (at the time of a weak hit) of the elastic body in the first embodiment. By pressing 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 the elastic body is deformed so that the sliding surface FS is recessed by elastic deformation.

At point C1 on the surface of the moving member 211 on the traveling direction D1 side (hereinafter, may be 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 the resistance force against the traveling direction D1. Further, at the point C2 on the surface of the moving member 211 on the side opposite to the traveling direction D1 (hereinafter, may be referred to as the rear side of the moving member 211), when the key press is weak (when the key is weakly hit), the upper member On the other hand, when the key is pressed strongly (when struck), it does not come into contact with 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 has passed. At the time of banging, the moving member 211 moves faster than it is restored. Therefore, on the rear side of the moving member 211, the region where the moving member 211 and the upper member 1211 do not contact increases. The greater the viscosity of the upper member 1211, the more the non-contact area increases even if the speed of the moving member 211 is the same.

The difference between a weak hit and a strong hit, that is, the difference in the strength of the key pressing force affects the magnitude of elastic deformation. On the other hand, regarding the size of the region where the moving member 211 and the upper member 1211 do not contact, the difference between the light hitting and the strong hitting is, in detail, the moving speed of the moving member 211 is a direct factor. That is, if the key pressing force is weak but the key pressing speed is already high, the area where the moving member 211 and the upper member 1211 do not contact increases. For example, when a key is pressed while swinging down, a large force is applied at the beginning of the key press, but the force is immediately 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 it is greatly affected by the repulsive force Fr1 from the front side. Resistance to key pressing is obtained.

When the moving member 211 comes into contact with the upper member 1211 on the rear side, 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 propulsive force in the traveling direction D1. Further, the weaker the hit, the smaller the amount of elastic deformation of the upper member 1211, so the magnitude of the repulsive force Fr1 is also smaller, and the contact area between the moving member 211 and the upper member 1211 is also smaller as a whole, and the frictional force is larger. It also drops. As described above, not only the difference in frictional force but also the influence of the repulsive force is different between the situation of FIG. 6 and the situation of FIG. Therefore, according to these configurations, the resistance force received by the moving member 211 with respect to the traveling direction D1 can be complicatedly changed depending on the strength and speed of the key press. The resistance force received by the moving member 211 also becomes the resistance force given to the key press. As a result, it is possible to reproduce the change in the resistance to the key press according to the strength and speed of the key press on the acoustic piano. Further, by using a material in which the elasticity of the upper member 1211 is greatly affected by acceleration (key pressing force) and the viscosity of which is greatly affected by speed (key pressing speed), the resistance to key pressing can be varied. It can also be designed.

Depending on the strength of the key press, when the key 100 reaches the end position, the moving member 211 may bounce on 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 likely to be elastically deformed than the sliding surface FS even if the same force is applied, and even if the moving member 211 collides with the guide surface GS, the moving member 211 moves on the sliding surface. The generation of collision sound is suppressed as compared with the case of collision with FS.

[Structure of moving member]
FIG. 8 is a diagram illustrating a configuration of a moving member according to the first embodiment. The moving member 211 includes an upper semi-cylinder 2111 and a lower semi-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 semicircle 2111 is larger than the radius r2 of the cross section (semicircle) of the lower semicircle 2112. Both semicircles have a common central CD. The cross section referred to here means a cross section cut by a plane having the scale direction as a normal (the same applies to the following description). In other words, the central axis of the upper semi-cylinder 2111 (the axis extending in the direction parallel to the scale direction and passing through the common central CD) is the same as the central axis of the lower semi-cylinder 2112. Therefore, it can be said that the upper semi-cylinder 2111 and the lower semi-cylinder 2112 have a common central axis. The upper half cylinder 2111 and the lower half cylinder 2112 are integrally formed of resin, but the upper half cylinder 2111 and the lower half cylinder 2112 are separately formed and both are integrally formed by an adhesive or the like. You may make it. Further, since the shapes of the upper half cylinder 2111 and the lower half cylinder 2112 of the moving member 211 are semi-cylindrical shapes obtained by dividing the cylinder in half and are a part of the cylindrical shape, the term including these is referred to as "partial cylindrical shape". It can be a "part". When the "partial cylindrical portion" is used in this way, the upper semi-cylindrical portion 2111 having a semi-cylindrical shape is an example of the first partial cylindrical portion, and the lower semi-cylindrical portion 2112 having a semi-cylindrical shape is the second portion. This is an example of a cylindrical portion. In addition, the "cylindrical shape" of the "partial cylindrical shape portion" is not limited to a cylinder, 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 "truncated cone" extending along the central axis can be interpreted as being included in the "cylindrical shape". Considering this way, for example, a combination of a truncated cone corresponding to the "first partial cylindrical shape portion" and a truncated cone corresponding to the "second partial cylindrical shape portion", or vice versa, or a "first partial cylindrical shape". It is also possible to adopt a combination of a truncated cone corresponding to the "part" and a truncated cone corresponding to the "second part cylindrical portion" having a different angle from the truncated cone. Further, the "cylindrical shape" may include a truncated cone whose flat surface is not a flat surface but a curved surface such as a sphere. Further, when the "cylindrical shape" is interpreted in this way, the "first partial cylindrical shape portion" and the "second partial cylindrical shape portion" are referred to as the "first partial conical shape portion" and the "second partial conical shape portion", respectively. It is also possible to correspond to "department".

As described above, the moving member 211 is provided with a curved surface of the upper semi-cylinder 2111 (curved surface 21111 (first curved surface) having a cross section of a semicircular arc (first arc) having a radius r1) on the sliding surface FS side, and is provided on the lower side. A curved surface of the semi-cylinder 2112 (curved surface 21121 (second curved surface) having a cross section of 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 central 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 central 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 comes into contact with the sliding surface FS at the position CP1 of the upper semi-cylinder 2111. There is. As shown in FIG. 8, when the upper semi-cylinder 2111 of the moving member 211 is in contact with the sliding surface FS of the upper member 1211, the lower semi-cylinder 2112 of the moving member 211 is on the guide surface GS of the lower member 1213. Not in contact. On the other hand, when the key 100 is at the end position, the moving member 211 moves to the position indicated by the broken line. At this time, the position of the moving member 211 in contact with the sliding surface FS changes to the position CP2 by slightly rotating. Similarly, in this case as well, 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 stationary, it is described as if one point of the arc is in contact with the sliding surface FS. However, in FIGS. 6 and 7. As described above, the sliding surface FS may be elastically deformed during key pressing (moving the moving member 211).

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 have the same size, that is, the moving member 211 is formed in a single cylindrical shape. The distance to and can be shortened. It is also conceivable to simply make the moving member 211 into a cylindrical shape and reduce the radius of the circle (make the cylinder thinner). However, in this case, since the amount of elastic deformation with respect to the sliding surface FS also changes, the resistance to the key press also changes. In this example, by combining semi-cylindrical cylinders with different radii, the distance between the sliding surface FS and the guide surface GS can be shortened while minimizing the influence on the resistance force, thereby reducing the size of the parts. it can. In this way, by using a pillar shape including a plurality of arcs having different radii of different sizes, it is possible to secure a larger degree of freedom in design. 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 The distance from the guide surface GS can be kept constant.

[Keyboard assembly operation]
FIG. 9 is a diagram illustrating 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 (state in which the key is not pressed). FIG. 9B is a diagram when the key 100 is in the end position (the state in which the key is pressed to the end). When the key 100 is pressed, the rod-shaped flexible member 185 bends around the center of rotation. At this time, the rod-shaped flexible member 185 is bent and deformed forward (toward the front) of the key, but the key 100 may move forward due to the restriction of the movement in the front-back direction by the side key guide 153. It comes to rotate in the pitch direction without. Then, the key-side load portion 120 pushes down the hammer-side load portion 210, so that the hammer assembly 200 rotates about 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 portion 230 moves upward, a force is applied so that the weight of the weight portion 230 moves the key 100 in the direction of returning to the rest position (upward). Further, in the load generating portion (key side load portion 120 and hammer side load portion 210), the moving member 211 elastically deforms the upper member 1211 when moving while in contact with the sliding surface FS, thereby pressing the key. You will receive various resistances depending on the method. This resistance force and the weight of the weight portion 230 appear as a load on the key press. Further, when the moving member 211 gets over the step portion 1231, the click feeling is transmitted to the key 100.

When the weight portion 230 collides with the upper stopper 430, the rotation of the hammer assembly 200 is stopped, and the key 100 reaches the end position. Further, 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 portion 230 moves downward, so that the hammer assembly 200 rotates. As the hammer assembly 200 rotates, the key 100 rotates upward via the load generating portion. When the weight portion 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, the 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 according to the second embodiment. In this example, the radius r1 of the cross section (semicircle) of the upper semicircle 2111A is smaller than the radius r2 of the cross section (semicircle) of the lower semicircle 2112A. Both semicircles have a common central CD. Also in this embodiment, the curved surface 2111A1 (an example of the first curved surface) which is the outer peripheral surface of the upper semi-cylinder 2111A slides on the sliding surface FS, and the curved surface 2112A1 (an example) which is the outer peripheral surface of the lower semi-cylindrical 2112A (1). An example of the second curved surface) is guided by the guide surface GS. At this time, in order to make the resistance force at the time of key pressing in the first embodiment and the second embodiment the same, the radius r1 is assumed to be the same in the first embodiment and the second embodiment. By doing so, the size of the sliding surface forming portion can be increased, so that the accuracy of the mold at the time of molding can be improved.

On the other hand, in order to obtain the effect of increasing the elastic deformation of the sliding surface FS, the radius r1 of the upper semi-cylinder 2111A of the second embodiment can be made smaller than that of the upper semi-cylinder 2111 of the first embodiment. is there. It is conceivable to simply make the moving member 211A into a cylindrical shape and reduce the radius of the circle (make the cylinder thinner), but in this case, since the moving member 211A becomes thinner, the radius r2 should be larger than the radius r1. Therefore, the strength of the moving member 211A can be improved. In this way, by using a pillar shape including a plurality of arcs having different radii of different sizes, it is possible to secure a larger degree of freedom in design. The radius r2 of the cross section of the lower semi-cylinder 2112A may be the same as the radius r1 of the cross section of the upper semi-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 the third embodiment, the moving members 211B and 211C having a cross section other than the combination of the two semicircles will be illustrated.

FIG. 11 is a diagram illustrating a moving member according to the third embodiment. The 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) which is the outer peripheral surface of the upper semi-cylinder 2111B slides on the sliding surface FS, and the curved surface 2112B1 (an example) which is the outer peripheral surface of the lower semi-cylindrical 2112B An example of the second curved surface) is guided by the guide surface GS. The central angle AG of the cross section (fan shape) of the upper partial cylinder 2111B is less than 180 degrees. On the other hand, as shown in the figure, the central angle of the lower partial cylinder 2112B is larger than 180 degrees because it is the angle obtained by subtracting the central angle AG from 360 degrees. At this time, in the range in which the moving member 211B can come into contact with the sliding surface FS (moving range of the moving member 211B), the curved surface of the upper partial cylinder 2111B and the sliding surface FS (including the step portion 1231) come into contact with each other. , The central 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 thus such a range is excluded. Further, the end EGD on the traveling direction D1 side of the upper partial cylinder 2111B is prevented from contacting the sliding surface FS including the step portion 1231 even when the sliding surface FS is elastically deformed, that is, the upper side. It is desirable that the curved surface portion of the partial cylinder 2111B and the sliding surface FS come into 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, as shown in the figure, the central angle of the lower partial cylinder 2112C is larger than 180 degrees because it is the angle obtained by subtracting the central angle AG from 360 degrees. In this case, the central angle AG is determined so that both ends of the upper partial cylinder 2111C do not come into contact with the guide surface GS. That is, when the central angle AG is large, the smaller the size of the radius r2 with respect to the radius r1, the easier it is for the end EG of the upper partial cylinder 2111C to come into contact with the guide surface GS.

<Fourth Embodiment>
In the above embodiment, the moving member is formed by a combination of two partial cylinders, but a structure other than the two partial cylinders may be included. That is, if the cross section of the moving member includes an arc arranged on the sliding surface FS side and an arc arranged on the guide surface GS side, other shapes may be further included. In the fourth embodiment, three moving members 211D, 211E, and 211F will be illustrated.

FIG. 12 is a diagram illustrating a moving member according to the fourth embodiment. The moving member 211D shown in FIG. 12A includes an upper partial cylinder 2111D and a lower partial cylinder 2112D. Also in this embodiment, the curved surface 2111D1 (an example of the first curved surface) which is the outer peripheral surface of the upper semi-cylinder 2111D slides on the sliding surface FS, and the curved surface 2112D1 (an example of the first curved surface) which is the outer peripheral surface of the lower semi-cylindrical 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, in addition to the upper partial cylinder 2111D and the lower partial cylinder 2112D, a side structure connecting the side portions of the upper partial cylinder 2111D and the lower partial cylinder 2112D. This side structure has convex sides. 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 which 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) which is the outer peripheral surface of the upper semi-cylinder 2111E slides on the sliding surface FS, and the curved surface 2112E1 (an example) which is the outer peripheral surface of the lower semi-cylindrical 2112E. An example of the second curved surface) is guided by the guide surface GS. In this case, at both ends of the upper partial cylinder 2111E and the lower partial cylinder 2112E, the curved surface of the upper partial cylinder 2111E and the side surface of the side structure are discontinuously connected, and the curved surface and the side portion of the lower partial cylinder 2112E. The sides of the structure are discontinuously connected.

In the moving member 211F shown in FIG. 12C, the side structure connecting the side portions of the upper partial cylinder 2111F and the lower partial cylinder 2112F has a different shape 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 in the traveling direction D1 side as compared with the above example. That is, of 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. Note that the angles AG3 and AG4 may have the same magnitude as in the above example. Further, also in the present embodiment, the curved surface 2111F1 (an example of the first curved surface) which is the outer peripheral surface of the upper semi-cylinder 2111F slides on the sliding surface FS, and the curved surface 2112F1 (an example) which is the outer peripheral surface of the lower semi-cylindrical 2112F. An example of the second curved surface) is guided by the guide surface GS.

<Fifth Embodiment>
The fifth embodiment is a configuration in which 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 key of the keyboard assembly and the hammer in the fifth embodiment. In FIG. 13, the relationship between the key, the weight, and the load generating portion is schematically shown. FIG. 13A is a diagram when the key 100J is in 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 about CF1. According to the above-described embodiment, CF1 corresponds to, for example, a rod-shaped flexible member 185. The key side load unit 120J and the key 100J are connected via a structure 1201J. The structure 1201J rotates about the 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 portion 120J. The hammer body 250E rotates about CF2. The CF2 corresponds to the rotating shaft 520 according to the above embodiment. The weight portion 230J is arranged between the CF2 and the hammer side load portion 210J.

As a result, when the key is pressed, 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. 13 (A) to the state shown in FIG. 13 (B). 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. 13 (B) to the state shown in FIG. 13 (A). In this way, 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, and various configurations can be taken.

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

(1) In the above-described embodiment, the sensor drive 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. Further, in this case, the slit 125 may not be formed in the lower member 1213.

(2) In the above-described embodiment, the entire sliding surface forming portion 121 is formed of an elastic body, but the present invention is not limited to this case. For example, the elastic body may be arranged in the entire region where the sliding surface FS is formed. Further, only the protruding portion formed on the guide surface GS may be formed of an elastic body. In order to obtain the resistance force against the key pressing described in the first embodiment, the range of the sliding surface FS that the moving member 211 can contact is formed of at least an elastic body in the entire movable range of the key 100. It is desirable to be there. In addition, all of the sliding surface forming portion 121 may be made of a member other than an elastic body.

(3) In the above-described embodiment, the key 100 is connected to the key side load unit 120 including the sliding surface FS, and the hammer assembly 200 is connected to the hammer side load unit 210 including the moving member 211. The relationship may be reversed. In the opposite relationship, specifically, the hammer side load portion 210 forms the sliding surface FS, and the key side load portion 120 includes the moving member 211. That is, one of the moving member 211 and the sliding surface FS may be connected to the key 100, and the other may be connected to the hammer assembly 200.

(4) The lower member 1213 (guide surface GS) does not have to have a part of the 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 to the end position, the hammer assembly 200 continues to rotate due to inertial force, and the moving member 211 is easily separated from the sliding surface FS. Immediately after the key 100 returns to the rest position, the hammer assembly 200 may continue to rotate due to inertial force, and as a result, the moving member 211 may collide with the sliding surface FS and bounce off. In these situations, the moving member 211 tends to come into contact with the guide surface GS. That is, it is desirable that the guide surface GS is arranged 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 step portion 1231 may not be present on the sliding surface FS. In this case, it is desirable to generate a click feeling by using another method. At least in the load generating part, it is not necessary to generate a click feeling. It is possible to give a resistance force to the key press by using the elastic deformation of the sliding surface FS at the load generating portion without causing a click feeling.

1 ... Key device, 10 ... Key assembly, 70 ... Sound source device, 80 ... Speaker, 90 ... Housing, 100, 100J ... Key, 100w ... White key, 100b ... Black key, 120, 120J ... Key side load unit, 1201J ... Structure, 121 ... Sliding surface forming portion, 1211 ... Upper member, 1213 ... Lower member, 1215 ... Side member, 1231 ... Step portion, 1233 ... Recession, 125 ... Slit, 151 ... Front end key guide, 153 ... Side key Guide, 180 ... Connection part, 181 ... Plate-shaped flexible member, 183 ... Key side support part, 185 ... Rod-shaped 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 semi-column, 2112, 2112A, 2112B, 2112C, 2112D, 2112E, 2112F ... Lower semi-column, 213 ... Rib part, 215 ... Sensor drive part, 220 ... Shaft support part, 230, 230J ... Weight part, 250, 250J ... Hammer 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, 710 ... Signal conversion unit, 730 ... Sound source unit, 750 ... Output unit

Claims (18)

A key that is rotatably placed with respect to the frame
A hammer assembly that is rotatably arranged according to the rotation of the key,
With the first member
When the hammer assembly rotates in response to the rotation of the key, it is arranged so as to slide on the first member and move on the first member, and the cross section is first on the first member side. It has a first curved surface that is an arc, a second curved surface that has a second arc in cross section on the opposite side of the first member, and the first arc and the second arc have the same center and radii of each other. With a different second member,
A third member that connects to the first member and guides the second member so that the second member does not separate from the first member by a predetermined distance or more.
A keyboard device equipped with. The keyboard device according to claim 1, wherein the third member comes into contact with the second curved surface in at least a part of the moving range of the second member. The keyboard device according to claim 1 or 2, wherein the radius of the first arc is larger than the radius of the second arc. The keyboard device according to claim 1 or 2, wherein the radius of the first arc is smaller than the radius of the second arc. The keyboard device according to any one of claims 1 to 4, wherein the first member is an elastic body arranged on at least a part of the surface. The keyboard device according to any one of claims 1 to 5, wherein the position of the first curved surface in contact with the first member changes depending on the 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 response to the rotation of the key. The second member is
The first partial cylindrical portion having the first curved surface and
A second partial cylinder portion located on the opposite side of the first partial cylindrical portion and having the second curved surface is provided.
The first cylindrical portion and the second cylindrical portion have a common central axis and have a common central axis.
The keyboard device according to any one of claims 1 to 7, wherein the radius of the first partial cylinder portion is different from the radius of the second partial cylinder portion. The keyboard device according to any one of claims 1 to 8, wherein one of the first member and the second member is connected to the key and the other to the hammer assembly. The hammer assembly includes a weight portion and is provided with a weight portion.
The first member exerts a force on the second member so that the weight portion moves upward while allowing the second member to slide with respect to the first member when the key is pressed. The keyboard device according to any one of claims 1 to 9. The first member is arranged with respect to the key at a position where the first member moves downward by a key pressing operation on the key.
The second member is connected to the hammer assembly, and the weight is moved upward with respect to the rotation axis of the hammer assembly so that the weight portion is moved upward by being pushed downward from the first member. The keyboard device according to claim 10, which is connected to the side opposite to the unit. The keyboard device according to claim 11, wherein the third member is arranged with respect to the key at a position where the second member is sandwiched between the third member and the first member. A key that is rotatably placed with respect to the frame
A hammer assembly that is rotatably arranged according to the rotation of the key,
With the 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 portion located on the opposite side of the first member. A second member including a second partial cylindrical portion having a curved surface, and
A third member that connects to the first member and guides the second member so as not to be separated from the first member by a predetermined distance or more is provided.
The first partial cylindrical shape portion and the second partial cylindrical shape portion have a common central axis.
A keyboard device in which the radius of the first partial cylindrical portion is different from the radius of the second partial cylindrical portion. The keyboard device according to claim 13, wherein the third member comes into contact with the second curved surface in at least a part of the moving range of the second member. The keyboard device according to claim 13 or 14, wherein the radius of the first partial cylindrical portion is larger than the radius of the second partial cylindrical portion. The keyboard device according to claim 13 or 14, wherein the radius of the first partial cylindrical portion is smaller than the radius of the second partial cylindrical portion. The keyboard device according to any one of claims 13 to 16, wherein the first partial cylindrical portion and the second partial cylindrical portion are integrally formed of a resin. The first member includes a sliding surface that comes into contact with the first curved surface, which is the 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, which is an outer peripheral surface of the second partial cylindrical portion.

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