JPWO2018016324A1 - Keyboard device - Google Patents

Abstract

While keeping the touch feeling in an electronic keyboard instrument close to the acoustic piano, secure the freedom of design when introducing the mechanism for obtaining the touch feeling as much as possible. The keyboard device includes a key rotatably disposed with respect to the frame, a hammer assembly rotatably disposed in response to rotation of the key, a first member, and a hammer disposed in response to rotation of the key. The first member is provided with a first curved surface which is arranged to slide on the first member and move on the first member when the assembly pivots, and the cross section becomes a first arc on the first member side. The second arc has a second curved surface whose cross section has a second arc on the opposite side, and the first arc and the second arc have the same center, and are connected to the second member having a different radius, and the first member. And a third member for guiding the member so as not to be separated from the first member by a predetermined distance or more.

Description

  The present invention relates to a keyboard device.

  In the acoustic piano, the action mechanism operates to give a predetermined feeling (hereinafter referred to as touch feeling) to the player's finger through the key. In particular, the operation of the escapement mechanism gives the player's finger a sense of collision according to the key depression speed and a sense of omission (as a whole, for example, a sense of click) as a sense of touch. In acoustic pianos, an action mechanism is required to strike a hammer. On the other hand, in an electronic keyboard instrument, since a key depression is detected by a sensor, it is possible to produce sound without having an action mechanism like an acoustic piano. The touch feeling of the electronic keyboard instrument that does not use the action mechanism and the electronic keyboard instrument that uses the simple action mechanism changes greatly to the touch feeling of the acoustic piano. Then, in the electronic keyboard instrument, in order to obtain a touch feeling close to an acoustic piano, various methods are examined (for example, patent document 1).

JP, 2013-167790, A

  In the electronic keyboard instrument, various mechanisms need to be introduced to obtain a touch feeling close to that of an acoustic piano, but since the space for that is limited, the degree of freedom in design is decreasing.

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

  According to an embodiment of the present invention, a key pivotably disposed relative to a frame, a hammer assembly pivotably disposed in response to pivoting of the key, a first member, and the key The hammer assembly is arranged to slide on the first member and move on the first member when the hammer assembly pivots in response to the rotation, and the cross section becomes a first arc on the first member side. A second member including a first curved surface, and a second curved surface whose cross section has a second arc on the side opposite to the first member, wherein the first arc and the second arc have the same center and different radii. And 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 third member may be in contact with the second curved surface in at least a part of the 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 first member may have an elastic body disposed on at least a part of the surface.

  The position in contact with the first member of the first curved surface 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 pivots in response to pivoting 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 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 sliding of the second member relative to the first member when the key is depressed. May be applied to the second member so as to move upward.
Further, the first member is disposed relative to the key at a position moved downward by a key depression operation on the key, and the second member is connected to the hammer assembly. It may be connected on the opposite side to the weight portion with respect to the pivot axis of the hammer assembly so that the weight portion is moved 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 rotatably arranged with respect to the frame, a hammer assembly rotatably arranged according to the rotation of the key, a first member, and a rotation of the key. A second partial cylindrical portion having a first curved surface sliding on the first member when the hammer assembly rotates in response to the second member, and a second curved surface opposite to the first member and having a second curved surface A second member having a partial cylindrical shape, and a third member connected to the first member to guide the second member not to be separated from the first member by a predetermined distance or more, The first partial cylindrical portion and the second partial 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. .
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.
In addition, the radius of the first partially cylindrical portion may be larger than the radius of the second partially cylindrical portion.
In addition, the radius of the first partially cylindrical portion may be smaller than the radius of the second partially cylindrical portion.
Further, the first partial cylindrical shape portion and the second partial cylindrical shape portion may be integrally formed of resin.
Furthermore, the first member includes a sliding surface in 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 shape. It is good also as providing a guide surface which can contact a certain 2nd above-mentioned curved surface.

  According to the present invention, it is possible to secure as much as possible freedom of design when introducing a mechanism for obtaining a touch feeling while bringing a touch feeling in an electronic keyboard instrument close 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 a side. It is explanatory drawing of the load generation part (a key side load part and a hammer side load part) in 1st Embodiment. It is a figure explaining the structure of the sliding face formation part in a 1st embodiment. It is a figure explaining elastic deformation (during striking) of an elastic body in a 1st embodiment. It is a figure explaining elastic deformation (at the time of weak hitting) of an elastic body in a 1st embodiment. It is a figure explaining the composition of the movement member in a 1st embodiment. It is a figure explaining operation | movement of a key assembly at the time of pressing down the 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 illustrates typically the connection relation of the key and hammer of the keyboard assembly in 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 embodiment shown below is an example of the embodiment of the present invention, and the present invention is not interpreted as being limited to these embodiments. In the drawings referred to in this embodiment, the same portions or portions having similar functions are denoted by the same reference numerals or similar reference numerals (reference numerals with A, B, etc. appended after numbers), and the repetition thereof The description of may be omitted. In addition, dimensional ratios (ratios between components, ratios in the vertical and horizontal directions, etc.) of the drawings may be different from actual ratios for convenience of explanation, or parts of the configurations may be omitted from the drawings.

First Embodiment
[Configuration of keyboard device]
FIG. 1 is a diagram showing the configuration of the keyboard device in the first embodiment. In this example, the keyboard device 1 is an electronic keyboard instrument such as an electronic piano which is produced in response to a key depression of 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 according 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 100 w and a black key 100 b. A plurality of white keys 100 w and black keys 100 b 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 100 w and the black key 100 b can be described without particular distinction, they may be referred to as the key 100. Also in the following description, when “w” is attached 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 portion of the keyboard assembly 10 resides inside the housing 90. When the keyboard device 1 is viewed from above, a portion of the keyboard assembly 10 covered by the housing 90 is referred to as a non-appearance part NV, and a part exposed from the housing 90 and visible to the user is referred to as an appearance part PV. . That is, the appearance part PV is a part of the key 100 and indicates an area where the user can perform a play operation. Hereinafter, a portion of the key 100 exposed by the appearance portion PV may be referred to as a key main body.

  A sound source device 70 and a speaker 80 are disposed in the housing 90. The sound source device 70 generates a sound waveform signal in response to the depression of the key 100. The speaker 80 outputs the sound wave form signal generated in the sound source device 70 to the external space. The keyboard device 1 may be provided with a slider for controlling the volume, a switch for switching the timbre, a display for displaying various information, and the like.

  In the description of the present specification, the directions such as up, down, left, right, near and far indicate the directions when the keyboard device 1 is viewed from the player when playing. Therefore, it can be expressed, for example, that the non-appearance portion NV is located on the back side with respect to the appearance portion PV. Also, the direction may be indicated based on the key 100, such as the front end of the key (front of the key) and the rear of the key (rear of the key). In this case, the key front end side indicates the front side of the key 100 as viewed from the player. The rear end side of the key indicates the back side of the key 100 as viewed from the player. According to this definition, it can be expressed that the portion from the front end to the rear end of the key body portion of the black key 100b in the black key 100b is a portion projecting upward beyond the white key 100w.

  FIG. 2 is a block diagram showing the configuration of the sound source device in the first embodiment. The sound source device 70 includes a signal conversion unit 710, a sound source unit 730, and an output unit 750. A sensor 300 is provided corresponding to each key 100, detects an 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 three-step key depression amount. The key pressing speed can be detected in accordance with the interval of this signal.

  The signal conversion unit 710 obtains an output signal of the sensor 300 (the sensors 300-1, 300-2, ..., 300-88 corresponding to the key 100 of 88), and the operation according to the operation state of each key 100 Generate and output a signal. In this example, the operation signal is a signal of MIDI format. Therefore, the signal conversion unit 710 outputs note-on in response to the key depression operation. At this time, the key number indicating which of the 88 keys 100 has been operated, and the velocity corresponding to the key depression 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 associates and outputs the key number and the note off. A signal corresponding to another operation such as a pedal may be input to the signal conversion unit 710, and may be 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. The sound wave type signal is output to, for example, the speaker 80 or a sound wave type signal output terminal.

[Configuration of keyboard assembly]
FIG. 3 is an explanatory view 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 disposed inside the housing 90. That is, the housing 90 covers at least a portion of the keyboard assembly 10 (the connection portion 180 and the frame 500) and the speaker 80. The speaker 80 is disposed at the back of the keyboard assembly 10. The speaker 80 is arranged to output a sound corresponding to the key depression toward the upper and lower sides of the housing 90. The sound outputted downward travels from the lower surface side of the housing 90 to the outside. On the other hand, the sound outputted upward passes from the inside of the housing 90 through the space inside the keyboard assembly 10, and from the gap between the adjacent parts of the key 100 in the appearance part PV or the gap between the key 100 and the housing 90 Go 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 portion) is illustrated as a path SR.

  The configuration of the keyboard assembly 10 will be described with reference to FIG. The keyboard assembly 10 includes a connecting 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, most of which are manufactured by injection molding or the like. The frame 500 is fixed to the housing 90. The connection unit 180 rotatably connects the key 100 to the frame 500. The connection 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-like flexible member 185 is supported by the key side support 183 and the frame side support 585 of the frame 500. That is, between the key 100 and the frame 500, a rod-like flexible member 185 is disposed. By bending the rod-like flexible member 185, the key 100 can be rotated relative to the frame 500. The rod-like flexible member 185 is configured to be removable from the key side support portion 183 and the frame side support portion 585. Note that the rod-like flexible member 185 may be configured so as not to be removable by being integrated 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 slidably contacts 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 in the upper and lower scale directions. The side key guides 153 slidably contact the side frame guides 513 on both sides in the scale direction. In this example, the side surface key guide 153 is disposed in the region corresponding to the non-appearance portion NV in 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). It may be arranged in the area corresponding to appearance part PV.

  Moreover, the key side load part 120 is connected to the key 100 in the downward direction of the external appearance part PV. The key load portion 120 is connected to the hammer assembly 200 so as to rotate the hammer assembly 200 when the key 100 is rotated.

  The hammer assembly 200 is disposed in the lower space of the key 100 and is rotatably attached to the frame 500. The hammer assembly 200 includes a weight 230 and a hammer body 250. The hammer support 250 is provided with a shaft support 220 serving as a bearing for the pivot shaft 520 of the frame 500. The shaft support portion 220 and the pivot shaft 520 of the frame 500 slidably contact at at least three points.

  The hammer side load unit 210 is connected to the front end of the hammer main body 250. The hammer side loading unit 210 includes a portion (moving member 211 described later; refer to FIG. 4) which contacts the inside of the key side loading unit 120 so as to be slidable substantially in the front-rear direction. A lubricant such as grease may be disposed at this contact portion. The hammer side load unit 210 and the key side load unit 120 (in the following description, they may be collectively referred to as “load generating unit”) generate a part of the load at the time of key pressing by mutually sliding. Do. The load generating portion is located below the key 100 in the appearance portion PV (in front of the rear end of the key body portion) in this example. The detailed structure of the load generation unit will be described later.

  The weight portion 230 includes a metal weight, and is connected to the rear end portion (rear side with respect to the rotation axis) of the hammer main body 250. In a normal state (when the key is not depressed), the weight portion 230 is placed on the lower stopper 410. This stabilizes the key 100 in 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 which is the maximum key depression amount of the key 100. The weight 230 also applies a load to the key depression. The lower stopper 410 and the upper stopper 430 are formed of a buffer material or the like (non-woven fabric, elastic body or the like).

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

[Outline of Load Generating Part]
FIG. 4 is an explanatory view of a load generation unit (key side load unit and hammer side load unit) in the first embodiment. The hammer side loading unit 210 includes a moving member 211 (second member), a rib 213 and a sensor driving unit 215 (plate-like member). Each of these configurations is also connected to the hammer main body 250. The moving member 211 is, in this example, in the form of a column having a bottom surface in which two substantially semicircles having different radiuses and the same center are combined and whose 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 portion 213 and having a surface of a normal in a direction perpendicular to the scale direction. That is, the sensor drive unit 215 and the rib portion 213 are in a vertical relationship. Here, the rib portion 213 includes the direction of movement by pressing the key in a plane. Therefore, there is an effect of reinforcing the strength of the moving member 211 and the sensor drive unit 215 with respect to the movement 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 drive unit 215, the moving member 211 and the rib portion 213 function as a reinforcing material. This can also reinforce each other and stiffen as a whole, rather than just providing ribs. As shown in FIG. 4, the moving member 211 is connected to the front end of the hammer main body 250 via the rib 211. Further, as described above, the weight portion 230 is connected to the rear end portion (rear side with respect to the rotation axis) of the hammer main body 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 axis of the hammer assembly 200.

  The key side loading unit 120 includes a sliding surface forming unit 121. The sliding surface forming portion 121 is disposed at the lower end portion of the key-side loading portion 120 extending downward from the key 100, as shown in FIG. That is, the sliding surface forming portion 121 is disposed with respect to the key 100 at a position moving downward when the key is depressed. 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 a 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, be 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 less likely to be deformed, for example, a rigid body such as a resin that is more rigid than the elastic body configuring the sliding surface forming portion 121. Thus, the shape of the outer surface of the sliding surface forming portion 121 is supported so as to be maintained. The outer surface includes a surface on the opposite side of the sliding surface FS in the sliding surface forming portion 121. Note that, from the sliding surface FS to the rigid body on the outer surface side, the rigidity may be gradually changed to be higher. In addition, it is desirable not to include a member that is more susceptible to elastic deformation than the sliding surface FS (a member having a lower rigidity than the sliding surface FS) during this period.

  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 in contact with the sliding surface FS. That is, the moving member 211 slides on the sliding surface FS. In this example, the sliding surface FS contacts the curved surface of the moving member 211 that is formed on the semicircular side with the large radius. Since the moving member 211 moves in contact with 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 is also slightly rotated to move the contact surface, it can be said that although it is not strictly continuous sliding, it is almost continuous sliding. In any case, in the range where the sliding surface FS and the moving member 211 slide along with the key depression, 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 FS is larger than the entire area that can be contacted.

  At this time, the entire load generation unit moves downward with the key depression, and the sensor drive unit 215 squeezes the sensor 300. In this example, in the sliding surface FS, the step portion 1231 is disposed in a 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 half cylinder 2111 described later of the moving member 211) moving from the initial position (the position of the moving member 211 when the key 100 is at the rest position). Be Further, a concave portion 1233 is formed in a portion of the guide surface GS facing the step portion 1231. The presence of the concave portion 1233 makes the moving member 211 easily move over the step portion 1231. Subsequently, the configuration of the sliding surface forming portion 121 will be described in detail.

[Configuration of sliding surface forming portion]
FIG. 5 is a view for explaining the structure of the sliding surface forming portion in the first embodiment. FIG. 5A is a view for explaining the sliding surface forming portion 121 described in FIG. 4 in more detail, and shows the internal structure by a broken line. FIG. 5B is a view of the sliding surface forming portion 121 as 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 (the key front end side). A region where the moving member 211 and the rib portion 213 exist is indicated by a two-dot chain 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 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 surface on the space SP side 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. In addition, the lower member 1213 is disposed at a position sandwiching the moving member 211 with the upper member 1211.

  The lower member 1213 is provided with a slit 125. The slit 125 passes through the rib portion 213 moving with the moving member 211. Although not shown 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 in which the lower member 1213 is sandwiched between the moving member 211 and the sensor drive 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 is provided with a portion (hereinafter, referred to as a protrusion P) which linearly protrudes along the slit 125. According to such a projecting portion 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 the curved surface formed on the semicircular side of the moving member 211 having the larger radius. On the other hand, a curved surface formed on the semicircular side of the moving member 211 with a smaller radius is in contact with 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 contact and slide on 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 be provided in any one side.

  At the time of key depression, a force is applied to the moving member 211 from the sliding surface FS. The force transmitted to the moving member 211 causes the hammer assembly 200 to rotate so as to move the weight portion 230 upward. At this time, the moving member 211 is pushed downward from the sliding surface forming portion 121 and pressed against the sliding surface FS, and moves in the direction of the traveling direction D1 with respect to the sliding surface FS. On the other hand, when releasing the key, the hammer assembly 200 is rotated by the drop of the weight portion 230, and as a result, a force is applied from the moving member 211 to the sliding surface FS. Here, the moving member 211 is formed of a member (for example, a resin having a rigidity higher than that of the elastic body forming the sliding surface FS) which is less likely to be elastically deformed as compared with the elastic body forming the sliding surface FS. There is. Therefore, the sliding surface FS elastically deforms when the moving member 211 is pressed. As a result, the moving member 211 receives various resistance forces against movement in response to the pressing force. This resistance will be described using FIGS. 6 and 7.

  FIG. 6 is a view for explaining elastic deformation (at the time of hitting) of the elastic body in the first embodiment. FIG. 7 is a view for explaining elastic deformation (at the time of weak hitting) of the elastic body in the first embodiment. By pressing the key, the moving member 211 is moved 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 a point C1 on the traveling direction D1 side (hereinafter sometimes referred to as the front side of the moving member 211) of the surface of the moving member 211, in addition to the frictional force Ff1 with the upper member 1211, the repulsion returned from the upper member 1211 The force Fr1 is a resistance to the traveling direction D1. In addition, at the point C2 on the opposite side of the surface of the moving member 211 to the advancing direction D1 (hereinafter, may be referred to as the rear side of the moving member 211), the upper member when the key depression is weak (during weak hitting) While it makes contact with 1211 (FIG. 7), it does not make contact with the upper member 1211 (FIG. 6) when the key depression is strong (during striking).

  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, on the rear side of the moving member 211, the area where the moving member 211 and the upper member 1211 are not in contact increases. As the viscosity of the upper member 1211 is larger, the area which is not in contact with the moving member 211 at the same speed increases.

  In addition, the difference between the time of the hard strike and the time of the hard strike, that is, the difference in the strength of the key pressing force affects the magnitude of the elastic deformation. On the other hand, regarding the size of the area where the moving member 211 and the upper member 1211 are not in contact, the difference between the weak hitting and the hard hitting depends on the moving speed of the moving member 211 as a direct factor. 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 contact increases. For example, when pressing the key while swinging down the hand, although a large force is applied to the beginning of the key pressing, the force is reduced immediately, the amount of elastic deformation decreases, and the moving member 211 approaches constant velocity movement. On the other hand, since the moving speed of the moving member 211 remains high, it is difficult to receive the force from the rear side of the moving member 211 due to the influence of the viscosity of the upper member 1211 and greatly affected by the repulsive force Fr1 from the front side, Resistance to key depression is obtained.

  When contacting the upper member 1211 on the rear side of the moving member 211, the moving member 211 receives the repulsive force Fr2 in addition to the frictional force Ff2. The frictional force Ff2 is a resistance in the direction of travel D1. On the other hand, the repulsive force Fr2 is a propulsive force in the traveling direction D1. Also, as the amount of elastic deformation of the upper member 1211 decreases as the strength is lower, the magnitude of the repulsive force Fr1 decreases, and the contact area between the moving member 211 and the upper member 1211 decreases as a whole, and the frictional force increases. Also decreases. Thus, in the situation of FIG. 6 and the situation of FIG. 7, not only the difference in the frictional force but also the influence of the repulsive force is different. Therefore, according to these configurations, the resistance that the moving member 211 receives in the direction of travel D1 can be complexly changed by the strength and speed of key depression. The resistance received by the moving member 211 is also a resistance applied to the key depression. This makes it possible to reproduce the change in the resistance to the key depression in accordance with the strength and speed of the key depression in the acoustic piano. Also, in the upper member 1211, the resistance to the key depression can be variously changed by using the material whose elasticity is greatly affected by the acceleration (key depression force) and the viscosity is greatly affected by the speed (key depression 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 on the sliding surface FS and collide with the guide surface GS. At this time, the projection 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. Because the contact area is small, the guide surface GS is more likely to be elastically deformed when the same force is applied than the sliding surface FS, and the moving member 211 is a sliding surface even if the moving member 211 collides with the guide surface GS. The occurrence of the collision sound is suppressed more than when the vehicle collides with the FS.

[Configuration of moving member]
FIG. 8 is a view for explaining 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. FIG. 8 shows the case where the moving member 211 is viewed in the scale direction, so 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 term “cross-section” as used herein refers to a cross-section cut along 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 half cylinder 2111 (an axis extending in a direction parallel to the scale direction and passing through the common center CD) is the same as the central 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, 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 a half cylinder shape obtained by dividing a cylinder into halves and are a part of a cylinder shape, the term including “partial cylinder shape Part. In addition, when using a "partial cylinder shape part" in this way, the upper half cylinder 2111 which is a semi-cylindrical shape is an example of a 1st partial cylinder shape part, and the lower half cylinder 2112 which is a half cylinder shape is a 2nd part It is an example of a cylindrical shape part. In addition, the “cylindrical shape” of the “partial cylindrical shape portion” is not limited to a circular cylinder, but may be interpreted to include other shapes as long as it extends along the central axis. is there. For example, even if it is shaped like a "frustum" extending along the central axis, it can be interpreted as being included in the "cylindrical shape". When considering in this way, for example, a combination of a cylinder corresponding to the "first partial cylinder-shaped portion" and a truncated cone corresponding to the "second partial cylinder-shaped portion", or a reverse combination thereof, or "a first partial cylinder shape It is also possible to adopt a combination of a truncated cone corresponding to “part” and a truncated cone corresponding to “second partial cylindrical shape part” having a different angle from the truncated cone. Further, the “cylindrical shape” may include one in which the flat surface of the base portion of the truncated cone is not a flat surface but a curved surface like a sphere. Further, when the “cylindrical shape” is interpreted in this manner, the “first partial cylindrical shape portion” and the “second partial cylindrical shape portion” are respectively referred to as the “first partial conical shape portion” and the “second partial conical shape It is also possible to make it correspond to

  As described above, the moving member 211 includes the curved surface of the upper half cylinder 2111 (a curved surface 21111 (first curved surface) whose section is a semicircular arc (first arc) with radius r1) on the sliding surface FS side. A curved surface (a curved surface 21121 (second curved surface) in which a cross section is a circular arc of a semicircle having a radius r2 (second circular arc) having a cross section of radius r2) is provided on the guide surface GS side. In other words, the radius of the upper half cylinder 2111 (the 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 (the 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 contacts the sliding surface FS at the position CP1 of the upper half cylinder 2111. There is. 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 on the guide surface GS of the lower member 1213. Not in touch. 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, by slightly rotating the moving member 211, the position in contact with the sliding surface FS changes to the position CP2. Also 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 FIG. 6 and FIG. 7, As described, the sliding surface FS may be elastically deformed during key depression (during movement of 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, ie, compared to the case where the moving member 211 is formed in one cylindrical shape. And the distance 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 made thinner). However, in this case, the amount of elastic deformation with respect to the sliding surface FS also changes, so the resistance to key depression also changes. In this example, it is possible to miniaturize the parts by shortening the distance between the sliding surface FS and the guide surface GS while minimizing the influence on the resistance force by combining the half cylinders having different radii. it can. As described above, by using a column shape including arcs of different radii of a plurality of sizes, it is possible to secure more freedom in design. Further, by sharing the centers of the semicircles of the respective half cylinders, even if the moving member 211 rotates, if the distance between the sliding surface FS and the guide surface GS is constant, the lower half cylinder 2112 and The distance to 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) is pressed in the first embodiment. FIG. 9A is a view when the key 100 is in the rest position (in the state where the key is not depressed). FIG. 9B is a view when the key 100 is in the end position (in the state where the key is depressed all the way to the end). When the key 100 is pressed, the rod-like flexible member 185 bends as a rotation center. At this time, the rod-like flexible member 185 is bent and deformed in the forward direction (front direction) of the key, but if the key 100 moves forward due to the restriction of the movement in the front-back direction by the side key guide 153 It will rotate in the pitch direction. Then, the key load portion 120 pushes down the hammer load portion 210, whereby the hammer assembly 200 pivots about the pivot shaft 520. Note that, 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 loading portion 120.

  At this time, since the weight 230 moves upward, the weight of the weight 230 applies a force to move the key 100 back to the rest position (upward). Further, in the load generating unit (the key side loading unit 120 and the hammer side loading unit 210), the moving member 211 elastically deforms the upper member 1211 when moving in contact with the sliding surface FS, It will receive various resistance according to the method. The resistance 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 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. In addition, when the sensor 300 is crushed by the sensor driving unit 215, the sensor 300 outputs a detection signal at a plurality of stages corresponding to the amount of crushing (the amount of key depression).

  On the other hand, when the key is released, the hammer assembly 200 is rotated by moving the weight portion 230 downward. As the hammer assembly 200 pivots, the key 100 pivots upward via the load generating portion. The contact of the weight portion 230 with the lower stopper 410 stops the rotation of the hammer assembly 200, 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 view for explaining the 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 the present embodiment, the curved surface 2111A1 (an example of the first curved surface) which is the outer peripheral surface of the upper half cylinder 2111A slides on the sliding surface FS, and the curved surface 2112A1 which is 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, in order to equalize the resistance at the time of key depression in the first embodiment and the second embodiment, the radius r1 is assumed to be the same in the first embodiment and the second embodiment. In this case, 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 increased.

  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 smaller in the upper half cylinder 2111A of the second embodiment than in the upper half cylinder 2111 of the first embodiment. is there. The moving member 211A may simply be formed in a cylindrical shape, and the radius of the circle may be reduced (the cylinder may be made thinner). In this case, the moving member 211A is narrowed, so the radius r2 should be larger than the radius r1. Thus, the strength of the moving member 211A can also be improved. As described above, by using a column shape including arcs of different radii of a plurality of sizes, it is possible to secure more freedom in design. 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 may not necessarily be a semicircle. In 3rd Embodiment, it illustrates about moving member 211B, 211C which has a cross section other than the combination of two semicircles.

  FIG. 11 is a view for explaining the 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 the present embodiment, the curved surface 2111B1 (an example of the first curved surface) which is the outer peripheral surface of the upper half cylinder 2111B slides on the sliding surface FS, and the curved surface 2112B1 which is the outer peripheral 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 (fan shape) of the upper partial cylinder 2111B is less than 180 degrees. On the other hand, the central angle of the lower partial cylinder 2112 B is larger than 180 degrees because it is an angle obtained by subtracting the central angle AG from 360 degrees as illustrated. At this time, 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 in a range (moving range of the moving member 211B) which can contact the sliding surface FS of the moving member 211B. , 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 may not come in contact with the sliding surface FS, so such a range is excluded. Further, the end EGD on the side of the upper partial cylinder 2111B in the direction of travel D1 does not contact 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 portion of the curved surface of the partial cylinder 2111B and the sliding surface FS be in contact with each other.

  On the other hand, in the moving member 211C shown in FIG. 11 (B), the central angle AG of the cross section of the upper partial cylinder 2111C is larger than 180 degrees. On the other hand, the central angle of the lower partial cylinder 2112C is larger than 180 degrees because it is an angle obtained by subtracting the central angle AG from 360 degrees as illustrated. In this case, the central angle AG is determined such 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 smaller the size of the radius r2 with respect to the radius r1, the easier the end EG of the upper partial cylinder 2111C contacts the guide surface GS.

Fourth Embodiment
In the above embodiment, the moving member is formed by a combination of two partial cylinders, but structures other than two partial cylinders may be included. That is, in the cross section of the moving member, as long as it includes an arc disposed on the sliding surface FS side and an arc disposed on the guide surface GS side, other shapes may be further included. In the fourth embodiment, three of the moving members 211D, 211E, and 211F are illustrated.

  FIG. 12 is a view 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) which is the outer peripheral surface of the upper half cylinder 2111D slides on the sliding surface FS, and the curved surface 2112D1 which is the outer peripheral 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, in addition to the upper partial cylinder 2111D and the lower partial cylinder 2112D, a side structure connecting the respective sides of the upper partial cylinder 2111D and the lower partial cylinder 2112D. The side structure has convex side surfaces. 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 the present embodiment, the curved surface 2111E1 (one example of the first curved surface) which is the outer peripheral surface of the upper half cylinder 2111E slides on the sliding surface FS, and the curved surface 2112E1 which is 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 of the lower partial cylinder 2112E It is discontinuously connected to the side of the structure.

  In the moving member 211F shown in FIG. 12C, the side structures connecting the side portions of the upper partial cylinder 2111F and the lower partial cylinder 2112F are different in shape in the traveling direction D1 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. The upper partial cylinder 2111F is disposed at a position rotated in the direction of travel D1 as compared to 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. The angles AG3 and AG4 may have the same size as in the above example. Also in this embodiment, the curved surface 2111F1 (an example of the first curved surface) which is the outer peripheral surface of the upper half cylinder 2111F slides on the sliding surface FS, and the curved surface 2112F1 which is the outer peripheral surface of the lower half cylinder 2112F ( An example of the second curved surface is guided by the guide surface GS.

Fifth Embodiment
The fifth embodiment has a configuration in which the key 100 and the key side load unit 120 are connected indirectly.

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

  The key 100J pivots around the CF1. The CF 1 corresponds to, for example, the rod-shaped flexible member 185 according to the above-described embodiment. The key side loading unit 120J and the key 100J are connected via the structure 1201J. The structural body 1201 J rotates around CF 3. 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 pivots around CF2. The CF 2 corresponds to the pivot axis 520 according to the embodiment described above. The weight portion 230J is disposed between the CF 2 and the hammer side load portion 210J.

  Thus, when the key is depressed, the key load portion 120J moves up inside the hammer 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 is lowered to push up the key 100J until it collides with the lower stopper 410J. That is, it changes from the state shown in FIG. 13 (B) to the state shown in FIG. 13 (A). As described above, if the load generation unit exists in the force transfer path from the key to the hammer assembly, the lock generation unit may be indirectly connected even if at least one of the key and the hammer assembly is directly connected to the load generation unit. May be connected, and various configurations may be taken.

<Modification>
As mentioned above, although one Embodiment of this invention was described, this invention can be implemented in various aspects as follows.

(1) In the embodiment described above, 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 drive 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-mentioned embodiment, although the whole sliding face formation part 121 was formed with the elastic body, it is not restricted to this case. For example, the elastic body may be disposed in the entire area in which the sliding surface FS is formed. Moreover, only the protrusion formed on the guide surface GS may be formed of an elastic body. In order to obtain the resistance to the key depression described in the first embodiment, the range of the sliding surface FS to which the moving member 211 can contact is formed at least by an elastic body in all of the movable range of the key 100 Is desirable. In addition, all the sliding surface formation parts 121 may be comprised by members other than an elastic body.

(3) In the embodiment described above, the key side loading unit 120 including the sliding surface FS is connected to the key 100, and the hammer side loading unit 210 including the moving member 211 is connected to the hammer assembly 200. The relationship may be reversed. In the reverse relationship, specifically, the sliding face 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 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) may not have a partial region. It is desirable to leave the guide surface GS in the area where the moving member 211 is likely to collide with the guide surface GS. For example, immediately after pressing the key 100 to the end position, the hammer assembly 200 continues rotating by the inertia 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, as a result of the hammer assembly 200 continuing to rotate by inertia force, the moving member 211 may collide with the sliding surface FS and bounce back. Under these circumstances, the moving member 211 can easily contact the guide surface GS. That is, it is desirable that the guide surface GS be disposed at least at both ends of the movement range of the moving member 211.

(5) In the embodiment described above, the protrusion P is disposed in the lower member 1213, but the protrusion P may not be disposed. 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 in the sliding face FS. In this case, it is desirable to generate the click feeling using another method. It is not necessary to generate a click feeling at least in the load generation unit. Even if the click feeling is not generated, it is possible to provide the resistance to the key depression by using the elastic deformation of the sliding surface FS in the load generation unit.

DESCRIPTION OF SYMBOLS 1 ... keyboard apparatus, 10 ... keyboard assembly, 70 ... sound source apparatus, 80 ... speaker, 90 ... housing | casing, 100, 100 J ... key, 100 w ... white key, 100 b ... black key, 120, 120 J ... key side load part, 1201 J ... Structure, 121 ... Sliding surface forming portion, 1211 ... Upper member, 1213 ... Lower member, 1215 ... Side member, 1231 ... Stepped portion, 1233 ... Concave portion, 125 ... Slit, 151 ... Front end key guide, 153 ... Side surface key Guide, 180: connection portion, 181: plate-like flexible member, 183: key side support portion, 185: rod-like flexible member, 200: hammer assembly, 210, 210 J: hammer side load portion, 211, 211A, 211B , 211C, 211D, 211E, 211F ... moving members, 211 1, 2111A, 2111B, 2111C, 2111D, 2111E, 2111F ... upper half Column, 2112 2, 2112 A, 2112 B, 2112 C, 2112 D, 2112 E, 2112 F lower half cylinder 213 rib portion 215 sensor drive portion 220 shaft support portion 230, 230 J weight portion 250, 250 J 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: rotation shaft 585: frame side support , 710: signal conversion unit, 730: sound source unit, 750: output unit

Claims (18)

A key rotatably disposed with respect to the frame;
A hammer assembly rotatably disposed in response to rotation of the key;
A first member,
The hammer assembly is disposed so as to slide on the first member and move on the first member when the hammer assembly rotates in response to the rotation of the key, and the first member has a first cross section on the first member side. It has a first curved surface which is an arc, and a second curved surface whose cross section is a second arc on the side opposite to the first member, wherein the first arc and the second arc have the same center and the radii are mutually different. Different second members,
A third member connected to the first member to guide the second member away from the first member by a predetermined distance or more;
Keyboard device equipped with   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.   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, wherein a radius of the first arc is smaller than a radius of the second arc.   The keyboard device according to any one of claims 1 to 4, wherein an elastic body is disposed on at least a part of the surface of the first member.   The keyboard device according to any one of claims 1 to 5, wherein a position of the first curved surface in contact with the first member changes 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 response to the rotation of the key. The second member is
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 have a common central axis,
The keyboard device according to any one of claims 1 to 7, wherein a radius of the first partial cylinder portion is different from a 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 is connected to the hammer assembly. The hammer assembly comprises a weight portion,
The first member exerts a force on the second member such that the weight portion moves upward while allowing the second member to slide relative to the first member when the key is depressed. The keyboard apparatus according to any one of claims 1 to 9, wherein The first member is disposed relative to the key at a position moved downward by a key depression operation on the key,
The second member is connected to the hammer assembly, and the weight is moved relative to the pivot shaft of the hammer assembly such that the weight portion is moved upward by being pushed downward from the first member. The keyboard apparatus according to claim 10, wherein the keyboard apparatus is connected to the opposite side of the unit.   The keyboard device according to claim 11, wherein the third member is disposed relative to the key at a position where the second member is sandwiched between the third member and the first member. A key rotatably disposed with respect to the frame;
A hammer assembly rotatably disposed in response to rotation of the key;
A first member,
A first partially cylindrical portion having a first curved surface which slides with the first member when the hammer assembly rotates in response to the rotation of the key, and a second portion located opposite to the first member A second member comprising a second partial cylindrical portion having a curved surface;
And a third member connected to the first member to guide the second member away from the first member by a predetermined distance or more.
The first partially cylindrical portion and the second partially cylindrical portion have a common central axis,
The keyboard device, wherein the radius of the first partially cylindrical portion is different from the radius of the second partially cylindrical portion.   The keyboard device according to claim 13, wherein the third member contacts the second curved surface in at least a part of the movement range of the second member.   The keyboard device according to claim 13, wherein a radius of the first partially cylindrical portion is larger than a radius of the second partially cylindrical portion.   The keyboard device according to claim 13, wherein a radius of the first partially cylindrical portion is smaller than a radius of the second partially 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 resin. The first member includes a sliding surface in contact with the first curved surface which 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 comprises a guide surface capable of contacting the second curved surface which is an outer peripheral surface of the second partial cylindrical portion.

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