JP2003099062A - Keyboard device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To absorb a size error even when key length is long and to enable reasonable smooth key operation to the overall stroke without causing any play nor generating any noise. SOLUTION: A key 45 is so supported as to swing vertically (in a keying direction) and vertically (in a key-width direction) around the point, where a curved surface formed on one wall surface 6a of a wedge-like wall surface formation part 6c of a key-side fulcrum part 6 and a curved surface part 4f of a projection body 4b provided at a support-member side fulcrum part comes into contact with each other, as a fulcrum. Then the plane wall surface 6a of the key-side fulcrum part 6 and a column surface 4c of the projection body 4b are in linear contact when fitted in, so rotation around an axis along the length of a key 5, i.e., rolling is stopped. The position of the key in the array direction is restricted by fitting the key in a key guide arranged on a key support member.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic organ and an electronic organ.
Electronic keyboard instrument such as piano or keyboard instrument such as piano
The present invention relates to a keyboard device that is suitable for a practice device or the like. 2. Description of the Related Art As a conventional keyboard device for an electronic keyboard instrument or the like,
Is disclosed, for example, in Japanese Patent Publication No.
Or the Japanese Patent Publication No. 45-8828)
(Hereinafter referred to as "second conventional example")
There is. [0003] The above-mentioned first conventional example is based on the lower surface of the rear end of the key.
A substantially L-shaped engaging projection provided on a keyboard serving as a key support member.
Engage with the engagement holes drilled in the frame, and
Abutting portion between the engaging projection and the edge of the engaging hole with respect to the frame
Is supported as a fulcrum so as to be pivotable in the vertical direction.
Right and left direction of key and rolling method by part and guide member
Direction (the direction of rotation about the axis along the front and rear direction of the key)
Direction) is regulated. [0004] Further, the above-mentioned second prior art example has a key rear end.
Part and key support member in one horizontal direction (horizontal direction)
Line contact state with contact line and 1
Contact in a point contact state with two contact points
The key to the key support member and the contact
Pivotally supported by the fulcrum and the guide member.
To restrict the left and right and rolling movement of the key.
I'm trying. [0005] However, as described above,
In the first conventional example, the key is moved in the left-right direction and
In addition to suppressing movement in the ring direction, the key
Because the movement in the left and right direction and the rolling direction is suppressed,
The key itself is warped or twisted, or the guide member is tilted or twisted
In addition, the processing accuracy of component parts such as
Even if there is a slight error in the mounting accuracy, the key
It exerts an acting force in the turning direction. For this reason, noise is generated during key operation and
Does not swing smoothly, and the touch feeling (operating feeling) of the key deteriorates
There was a problem. Also, between the lower surface of the key and the engagement projection
Does not exactly match the thickness of the key support member
And a gap is formed in an engagement portion between the engagement protrusion and the engagement hole.
And that sometimes caused noise. In the second conventional example, the key is moved in the left-right direction.
Key is not configured to absorb the
If the key is pressed while it is shifted, the part where rattling occurs when the key is pressed
Generates noise in minutes. Also, the line contact part is along the left and right direction
Rollin of the key because of the line contact state with one contact line
Guide members to suppress movement in the
The frictional part of the key increases and the key operates smoothly.
However, there is a problem that the touch feeling of the key deteriorates. these
This problem becomes more pronounced as the key length increases, so
It was also to narrow down the reason. And even these
In the key fulcrum structure, the middle part in the longitudinal direction of the key is used as the swing fulcrum
Not applicable to seesaw key, using electromagnetic actuator
It cannot be used as a keyboard device for keyboard instruments that can be played automatically.
won. [0008] The present invention provides a conventional keyboard device as described above.
To solve the problem due to the structure of the
Dimensional error even when the key length is long
Can absorb all noise, without rattling or noise.
Enables easy and smooth key operation over the trokes
There is also a degree of freedom in design, and stable key operation even with a seesaw key
The purpose is to enable. [0009] The present invention has been made in view of the above-mentioned object.
To achieve, the support member and the support member
It consists of a plurality of keys that are swingable around a fulcrum.
Keyboard device that has a keyboard
On the two inner walls facing in the key width direction or key height direction,
A wedge-shaped wall forming part having a wedge-shaped wall is provided, and the wedge-shaped wall is formed.
One wall surface of the surface forming section is a flat surface, and the other wall surface has a curved surface.
To form a key-side fulcrum. On the other hand, a wedge-shaped wall of each key is provided on the support member.
A projecting body that fits between the surfaces is provided, and the projecting body is
A column that makes a line contact with the flat surface on one of the wedge-shaped walls when it is fitted
Point or a curved surface formed on the other side of the wedge-shaped wall surface.
Supporting part with a curved surface corresponding part that contacts with a small area close to
The material-side fulcrum is configured. And placed on the support member
Is inserted into the key to regulate the position of the key in the arrangement direction.
Key guide. In this keyboard apparatus, the wedge-shaped wall of each key is provided.
The rear surface of the surface forming portion is defined as a key rear end surface, and the key rear end surface extends rearward.
It can be made configurable. Also, the key-side fulcrum
Provided behind the key operation part and in the middle part of the key longitudinal direction
You can also. The keyboard apparatus according to the present invention has a key-side fulcrum.
And the fulcrum on the support member side are configured as described above.
Therefore, each key is one of the wedge-shaped wall forming portions of this key-side fulcrum.
Provided on the curved surface formed on the wall surface of the
Up and down with the point of contact with the curved surface of the
(Key pressing direction) and left / right direction (key width direction)
The flat wall surface of the key-side fulcrum and the
When the key is inserted, it is in line contact.
Rotation or rolling is prevented. Also, the key support
The fulcrum of the key is formed by the engagement between the curved surface of the point and the curved surface of the protrusion.
Is held at a predetermined height position. [0013] Thereby, the dimensional error of the key attaching portion can be reduced.
It can absorb errors even if the key length is long.
Smooth key drive over all strokes
Movement becomes possible. It also prevents key rolling
This eliminates the need for a guide member for the key in the vertical direction.
Need only regulate the position of the key in the key array direction.
It only needs to make point contact with the inner wall surface. Therefore, the friction part is small.
Disappears, keys move smoothly and touch feeling improves
At the same time, no noise is generated. The key-side fulcrum has a wedge-shaped wall.
The supporting member side fulcrum by the urging force of the urging means.
Because it is pressed against the protruding body, there is play due to the wedge effect
No noise is generated, and no self-alignment is performed.
There is also an effect. Note that the keys that make up the keyboard
Using the ability to swing, you can slightly move the key
By moving it strangely, vibrato, tremolo,
To provide modulation effects such as noise and reverb
You can also. In that case, the inner wall surface on both sides of the key of each key guide
A pressure-sensitive film as a roll sensor
Alternatively, a pressure-sensitive sensor such as a pressure-sensitive rubber may be attached. The rear surface of the wedge-shaped wall forming portion of each key is defined as a key rear end surface.
This increases the strength of the key-side fulcrum and
Extending the rear end face of the back to make it a seesaw key
be able to. Place the key-side fulcrum behind the operating part of each key.
If the key is provided in the middle of the key in the longitudinal direction,
Automatic performance by operating each key using magnetic actuator
Keyboard device that can perform
Key operation becomes possible. Furthermore, the degree of freedom of design increases,
Touch feeling is completely different, like organ keys and piano keys
The structure of the swing fulcrum is also shared for
Some or all of the mold may be shared when molding
Can be made possible. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Explain physically. [First Embodiment] FIG. 1 is a keyboard showing a first embodiment of the present invention.
Section along the longitudinal direction of the black key when the key is not pressed
FIGS. 2A and 2B also show the state in which the maximum stroke key is pressed.
Sectional view along the longitudinal direction of the white key, FIG.
FIG. 2 is a partial plan view with a part removed. First, a description will be given mainly with reference to FIG.
1 is a first frame which is a supporting member, and 2 is also a supporting member.
The second frame, which is fixed by screwing
Wooden shelf on the shelf 3 which is the keyboard device support for the instrument housing.
It is attached and fixed by a screw 8 and a bolt 9. 1st f
Between the frame 1 and the second frame 2 in the key arrangement direction.
A spacer pillar 17 as a reinforcing material is interposed at a distance.
I have. The first frame 1 and the second frame 2
It is formed by sheet metal processing of a metal plate such as an iron plate. Soshi
Corresponding to each key at the rear of the flat part of the first frame 1.
Each of the cut-and-raised pieces 1a has a support for supporting each key.
Outsert molding of the holding member side fulcrum 4 with resin
And there is a white key 5W made of resin (see FIG. 1).
Is indicated by a virtual line) and the key-side fulcrum 6 of the black key 5B is inserted.
And each of the white key 5W and the black key 5B is swingably supported.
You. Hereinafter, for the common description of the white key 5W and the black key 5B,
When they are collectively referred to as "key 5". A plate bar is provided between each key 5 and the fulcrum 4 on the support member side.
The neck 7 is bent in a bow shape and attached, and its elastic restoring force
The key-side fulcrum 6 and the support member-side fulcrum 4
Act as urging means for maintaining the contact state. 10 is
A main body cover including an operation panel;
At the rear of each key 5 hidden by 0, to attach and detach the leaf spring 7
Opening 5a and an opening 5k that allows key attachment / detachment are provided.
You. The support member-side fulcrum 4 and the key-side fulcrum 6
Is the key depressing and releasing direction of the key 5 with respect to the first frame 1 (upper and lower
Swing) in the key width direction (left / right direction in FIG. 3)
And rolling (centering on the axis along the longitudinal direction of the key 5)
Rotation), but the details
This will be described later. The free end of the black key 5B is connected to the adjacent white key 5W.
Of the white key 5W through the lower side of the operation unit
Extending, and the extending portion 5b is formed on the first frame 1.
It enters the lower side of the first frame 1 through the through hole 1b and
Drives the driven part of the action member described below at the free end
The driving unit 5c is formed. On the lower surface of the middle part of the black key 5B
Is provided with an actuator 5d for driving a key switch.
I have. FIG. 2 also shows the vicinity of the free end of the white key 5W.
A driving unit 5e extending downward is formed so that the first
The first frame through the through hole 1c formed in the frame 1
1. Enter the lower part of 1 and move the driven part of the corresponding action
It is designed to be driven. In the middle of this white key 5W
The key switch is located at a position in line with the actuator 5d of the black key 5B.
A switch driving actuator 5d is provided. 5
g is the rear end face of the key 5, and the key side
The strength of the fulcrum 6 is increased, and the fulcrum 6 is used in the second embodiment described later.
This makes it easy to change to a seesaw key. Actuating each key 5 on the first frame 1
At a position corresponding to the key 5d, a through hole 1d for a key switch is provided.
With a through hole for holding the switch substrate before and after
Spacers 11 and 11 to be outsert molded with resin
It is provided. Then, the switch substrate 12 is removed.
Back side of the first frame 1 via the spacers 11
Are arranged in parallel at predetermined intervals and screwed
Attach and hold. On the upper surface of the switch board 12, each key 5
Bowl-shaped elastic portions opposed to the respective actuators 5d
The key switches 13 provided with materials are arranged in rows, and
As shown in FIG. 2, the bowl-shaped elastic member is actuated.
When a predetermined stroke is pressed by the
The point is closed and a key press signal is generated. this
The key switch provided with such a bowl-shaped elastic member is the same as the key switch described above.
JP-A-56-99596 and JP-A-4-107296.
No.
Description is omitted. Black on the front side of the through hole 1d of the first frame 1
Outer resin is applied to the cut-and-raised piece 1e formed at the key mounting position.
A black key guide 14 is provided by forming the black key into each black key.
5B to regulate the position in the key array direction.
You. Further, the cut-and-raised piece 1e of the first frame 1 is further
Cut-and-raised piece 1f formed at the white key mounting position on the near side
(Fig. 2), resin is outsert molded and white key guide 1
5 and insert it into each white key 5W to arrange its key arrangement.
Direction is regulated. The upper end of the white key guide 15 is shown in FIG.
Bulging portions 15a, 1 bulging spherically in the key width direction.
5a, and points on the inner wall surfaces S1 and S2 facing the white key 5W.
Or, it comes into contact with a small area close to it. black
The key guide 14 also has a bulging portion like the white key guide 15.
And a point or a small surface near it on the opposite inner wall surface of the black key 5B
Contact by product. Thereby, the key 5 and the key guide member are used.
Friction between the black key guide 14 and the white key guide 15
Therefore, smoother key operation becomes possible. Reference numeral 20 shown in FIG. 1 and FIG.
Mass member assembly, which is the action member of
A first arm 21 which is a main body of the
Second arm 22 and a wire corresponding to a jack of a piano.
Let-off lever 23 and the like, which are pen function members, are assembled.
It is an assembled body. First arm 21 and let-off
The bar 23 is formed of resin, and the second arm 22 is heavy.
Member 22a and a resin part formed by outsert molding on a part thereof
22b. The first arm 21 is provided at the front end (free end) of the key 5.
Part) near the front end 21a corresponding to the rear end of the key (fulcrum).
Part) up to the rear end 21b corresponding to the vicinity, in the longitudinal direction of the key 5.
And extends from its front end 21a to substantially the entire length.
The position of about 1/3 is the widest (vertical direction in FIGS. 1 and 2)
Wide, with a partial columnar swing fulcrum 21c at the bottom
And a support 16 fixed on the second frame 2.
And placed on top of each other, with the contact portion between them as a fulcrum in FIG.
It is supported swingably in the direction indicated by the mark C, and
The portion 21c rotates on the support 16 in the key longitudinal direction during rotation.
It is configured to be able to move slightly. The fulcrum 21c of the first arm 21
The front end side is formed in an elongated triangular shape.
The driving portion 5c of the black key 5B or the white key near the front end 21a.
When the driven portion 21d that engages with the 5W driving portion 5e is provided,
In both cases, a cantilevered elastic piece 21e is integrally provided along the upper side.
And a bar formed near the distal end and the base of the elastic piece 21e.
Insert the first leaf spring 24 between the lock portion 21f.
It is bent and engaged, and the driven unit 21d is driven by the driving unit 5c or 5e.
And the elastic piece 21e and the first leaf spring 2
The engagement state is always maintained by the urging force of 4.
You. The first leaf spring 24 is shown in FIG.
It is formed in an elongated frame shape as shown in the plan view, and the front end
An engaging portion 24a for engaging the front end of the elastic piece 21e is attached to the rear end.
Each has an engagement portion 24b with the engagement portion 21f.
Two side pieces distributed to both sides of the first arm 21 in between
It has a hollow configuration in which the portions 24c and 24d are formed in parallel.
You. After the swing fulcrum 21c of the first arm 21
The end side is tapered and elongated and extends to the swing fulcrum 21c.
The front end of the second arm 22 by the shaft 25 at a relatively close position.
Portion is rotatably supported at a position in front of the second arm 22.
Part cuts the middle part of the first arm 21 in the middle of the thickness direction
Instead, they are fitted so as to sandwich them from both sides. this
A second arm is provided at a lower portion of the first arm 21 slightly behind the shaft 25.
21g of the arm locking piece is protruded with a slight inclination
The first arm 21 in the state of a single action member is
Forming an over-deformation prevention portion of the second arm 22;
It can also be used as a part for preventing bounce when
A pad 26 such as elt is stuck. Further, near the rear end of the first arm 21.
, The let-off lever 23 is relatively moved by the shaft 28.
It is pivotally supported. Let-off lever 23
It has a shape close to a square, and as shown in the plan view of FIG.
One end of the second arm contact portion 23a and the other end of the stopper contact
Portion 23b, except for these portions, which are hollow in the thickness direction.
And penetrates the rear of the first arm 21 through the hollow portion 23c.
Let through. This first arm 21 and let-off lever
23 function as a wipen function member. The first arm 21 has an edge 21 along the outer periphery.
h and a plurality of ribs formed at intervals in the longitudinal direction
21i is a thick wall, and a plane part partitioned by them
21j is formed to be thin and does not secure sufficient strength.
In addition to preventing sink during molding, make it as lightweight as possible.
The center of gravity of the mass assembly 20 as a whole
It is made to be near the end. The second arm 22 has a large mass such as an iron material.
A portion where the weight member 22a made of a metal material is exposed;
Resin part 22 outsert molded with resin in the first half of iron material
b, and a concave groove with an open upper side is provided in the middle part.
And a cushioning material 29 such as resin which is somewhat flexible
The second arm of the let-off lever 23 in the initial stage of key press
A first contact surface 22c contacting the contact portion 23a and a first contact surface 22c shown in FIG.
The outer surface of the second arm contact portion 23a contacts at the end of key press
The second contact surface 22d is formed, and a back check mechanism is provided.
Constitute. Performing the back check function is mainly
The second arm contact portion 23a of the toe lever 23 and the second arm
Due to the contact of the drum 22 with the second contact surface 22d. The dew of the weight member 22a of the second arm 22
The projection is slightly crank-shaped, and the first frame 1
Protruding rearward through a through hole 1g formed in the rear end vertical portion
And the elastic cantilever piece 30a is integrated with the rear end.
Outsert the cap 30 with resin and mold,
It is fitted. Also, the elastic cantilever on the upper surface of the weight member 22a
At a position corresponding to the free end of the piece 30a, use a felt or the like.
To protect cantilever 30a when key is pressed
You are. On the upper surface of the shelf 3, when the key is not pressed as shown in FIG.
Lower limit at which the lower surface of the weight member 22a of the second arm 22 abuts
A stopper 32 is provided. This lower limit stopper 32
It is made of felt, rubber, etc. On the other hand,
First frame of support member side fulcrum 4 formed by outsert molding
Made of felt, rubber, etc. on the lower surface exposed inside 1
Attach the upper limit stopper 33 and finish pressing the key as shown in FIG.
And the stopper contact portion 23b of the let-off lever 23
Make the free end of the elastic cantilever 30a contact
I have. A spring locking portion 2 is provided on the upper front end of the second arm 22.
2e is formed, below the shaft 28 of the let-off lever 23
And an upper portion are formed with a spring locking portion 23d.
And the second leaf spring 34 is curved and engaged.
You. This second leaf spring 34 is shown in FIG.
As shown in the plan view, the second arm 22 is spring-locked to the front end.
Has an engagement portion 34a with the portion 22e, and extends in parallel therefrom.
And two spring pieces 34b and 34c.
34b is connected to one side of the let-off lever 23 (see FIG.
1, the spring locking portion 23 on the lower side of the shaft 28
d) and let the rear end of the other spring piece 34c be let off.
The shaft on the other side (the side not seen in FIGS. 1 and 2) of the lever 23
28 is engaged with the upper spring locking portion 23d. With the second leaf spring 34,
The differential rotation torque between the two spring pieces 34b and 34c is generated.
And let the let-off lever 23 turn left around the axis 28.
Directional return force. This mass assembly 2
0 is the weight of the weight member 22a of the second arm 22.
Close to the heart, opposite to the driven part 21d from the swing fulcrum part 21c
Side of the mass body assembly 20
Large inertia moment when key is pressed even if the whole is lightly formed
And acts like a piano hammer. The driving units 5c and 5c for the white key 5W and the black key 5B
5e are almost the same distance from the pivot point of the key
Can be provided in any position, each of which is a white key 5W
Near the tip (free end) of the
Separation becomes longer and occurs at the contact part between the drive unit and the driven unit
The stroke error is the position where the player's finger touches the key (operation
Part), there is no element to be amplified, so the driven member
For the drive of the mass body assembly 20
Work accuracy is improved. In this embodiment, the driven member includes a mass.
Since it is an action member, the key and action member
To improve troke accuracy and touch feel accuracy
The action members for the white key and the black key are almost the same.
It can be formed in one. Also shown in FIG. 1 by a virtual line.
As described above, the second frame at the position facing the driving units 5c and 5e
A key switch 13 'is provided on the system 2, and the first arm
21 to drive the key switch 13 '.
Then, the key switch ON position with respect to the key pressing stroke,
That is, the accuracy of the sounding position can be improved. The swing fulcrum 21c of the first arm 21
And the position of the driven portion 21d are the black keys for the black key shown by the solid line in FIG.
Slightly different from the case for the white key indicated by the imaginary line.
The distance between the driven part and the pivot point is
So that the white key is slightly longer than the white key
Make the touch feel (reaction force) of the key and the black key the same
I have. However, the first arm 21 shown in FIG.
The shape of the part on the left side of the dashed line AA is for the black key and the white key
Only slightly changes depending on the application, the entire mass assembly 20
Are almost the same shape,
The right side of the line A-A, and the
2-arm 22, let-off lever 23, cap 30,
The second leaf spring 34 etc. are all for black keys and white keys
May be the same member having the same shape and material. Therefore, as described in the operation section,
In addition, most of the parts constituting the mass body assembly 20 are white.
The second arm 22 and the let can be shared for the key and the black key.
The split mold for forming the off lever 23 is 1
All you need is a pair. Only the first arm 21 is for white key and black key
It is necessary to mold with a separate mold, but the alternate long and short dash line AA
To use the mold divided into the left part and the right part of
Then, the mold on the right side can be shared,
Prepare only the mold separately and use it in combination with the shared mold.
Use it, and reduce costs significantly
Can be. This economic effect is great. in this regard
Will be described in detail later in the description of the third embodiment. Ma
The action of the mass body assembly 20 at the time of key depression
Details and effects will be described later. Here, the support member side fulcrum 4 and
The details of the key-side fulcrum 6 will be described. FIG. 8 shows in FIG.
And enlargement of the vicinity of the fulcrum 4 on the support member side surrounded by a dashed line L
FIG. 9 is a plan view, FIG.
0 is a rear view as viewed from the direction of arrow M in FIG. Also figure
11 is a perspective view of the supporting member side fulcrum part 4 as viewed obliquely from the front.
is there. Referring to these figures, first, the supporting member side fulcrum
The unit 4 will be described. The transparent frame formed in the first frame 1
The resin formed by the outsert molding wraps around the hole 1f and the base 4
a is formed, and the cut and raised portion shown in FIGS.
The protruding body 4b formed by outsert molding on the stiffener 1a
The key 5 stands upright. In FIG. 8, the base 4a
The exposed surfaces 1i of the first frame 1 can be seen on both sides. One side of the protruding body 4b has a vertical axis.
A cylindrical surface 4c having a line is formed, and the other side surface is
The half part is a plane 4d along the longitudinal direction of the key 5, and the rear part is the rear.
Slope 4e inclined so as to make the projection 4b thinner toward
And slightly above the center of the slope 4e in the vertical direction.
A spherical bulging portion (curved surface corresponding portion) 4f is formed in the portion.
You. Here, the outer surface of the cylindrical surface 4c must be completely arc-shaped.
It is not necessary, and may be a deformed curved columnar surface. On the other hand, FIG. 12 shows the key turned upside down and its key fulcrum.
It is the principal part enlarged perspective view which looked at the part 6 vicinity from diagonally forward. This
As shown in the figure, the rear end face of key 5 (the same for the white key and the black key)
Two inner wall surfaces S opposed to each other in the key width direction near the rear close to 5 g
1, S2, wedge-shaped wall surface 6 whose interval decreases toward the rear of the key
a, 6b (the wedge-shaped wall surface 6a is parallel to the inner wall surface S1)
And a wedge-shaped wall forming portion 6c
One wall surface 6a is a flat surface, and the other wall surface 6b has a key height
The concave curved surface 6d curved in the same direction in the middle part of the direction
The key side fulcrum 6 is formed along the direction. FIG. 13 shows this key 5 in the form of a projection shown in FIG.
FIG. 15 is a cross-sectional view taken along the line CC of FIG.
It is. FIG. 14 is a view taken along the line AA in FIGS. 8 and 13.
FIG. 15 is a sectional view taken along line BB. this
According to these figures, the support state of the key 5 according to this embodiment is shown.
Will be described. The support between the wedge-shaped walls 6a and 6b of the key-side fulcrum 6
The projecting body 4b of the holding member side fulcrum 4 is fitted.
Then, each key 5 is mounted on the first frame 1 and the plate shown in FIG.
When the spring 7 is engaged, the wedge-shaped wall surfaces 6a and 6b
Is pressed against the cylindrical surface 4c and the bulging portion 4f. It
Therefore, as shown in FIG. 14 and FIG.
When the flat wall surface 6a and the cylindrical surface 4c of the protrusion 4b are fitted
Approximately linearly along the key height direction
Abutting (line contact), a recess formed on the other wedge-shaped wall surface 6b
The curved surface 6d and the spherical bulge 4f of the protruding body 4b are connected to a point or the point.
Contact (point contact) with a small area close to this. According to FIG. 14, along the spherical surface of the bulging portion 4f.
Are in fine line contact. Curved from the radius of curvature of the bulging portion 4f
By making the surface 6d slightly larger, point contact is obtained.
Contact and small surface
Product contact. Also, the central valley line of the concave curved surface 6d is also horizontal.
Due to being parallel and curved, the minute lines are small
Product. Prohibited only key rolling
A fulcrum structure that is a keyboard device and stable for a long time
In order to achieve this, it is desirable that the contact has a small area.
In addition, a curved surface where the wedge-shaped wall surface 6b side and the protruding body 4b side abut.
May be opposite to that of this embodiment. The key-side fulcrum 6 and a key supporting member frame
By configuring the fulcrum 4 on the system side in this way, the key
Reference numeral 5 denotes a concave curved surface 6d of the key-side fulcrum 6 and a sphere of the projection 4b.
With the contact point with the planar bulge 4f as a fulcrum,
Key direction) and left and right direction (key width direction)
Planar wall surface 6a of key-side fulcrum 6 and cylindrical surface of protrusion 4b
4c is in line contact with the key in the key height direction.
Rotation or rolling about the axis is prevented.
You. Also, the concave curved surface 6d of the key-side fulcrum 6 and the sphere of the projecting body 4b
The fulcrum of the key is located by the engagement of the uneven surface with the planar bulging portion 4f.
It is held at a fixed height. Thus, the key fulcrum portion and the key guide portion
For dimensional errors in the key arrangement direction or warpage during key molding
When the key length is long, it can absorb dimensional errors due to
But it is impossible to absorb the error over the entire stroke.
A smooth key drive becomes possible. Also the key Rollin
So that it is guided by a mass
Then, the guide member in the vertical direction of the key is also unnecessary on the key side
You can also. In this embodiment, the key guide is a key arrangement.
As described in FIG. 4, only the position in the column direction is restricted.
Guide 15 which makes point contact with the inner wall surface of the key.
You. As a result, there is less friction and the key moves smoothly.
No noise is generated even if there is the above dimensional error.
Become. The key-side fulcrum 6 forms a wedge-shaped wall.
That is always supported by the urging force of the leaf spring 7
Since it is pressed against the projecting body 4b of the fulcrum part 4, the wedge effect
No noise and no rattling
There is no effect, and there is also an effect of automatic alignment. Each key constituting the keyboard is swung right and left.
Using the ability to move, the key is delicate to the left and right during performance
By moving the vibrato, tremolo, bread,
It is possible to add a modulation effect such as reverb.
Wear. In that case, apply the key to the inner wall on both sides of the key of each key guide.
A pressure sensitive film as a roll sensor is in contact with
Alternatively, a pressure-sensitive sensor such as a pressure-sensitive rubber may be attached. According to the structure of the fulcrum, the key is
In the above-mentioned embodiment, since it can swing in two intersecting directions,
Set the left-right direction to the key press direction and the up-down direction to the key width direction.
Like, the key is turned sideways (although the shape of the key changes)
The protrusion at the supporting member side fulcrum is bent into an L-shape,
It can be fitted horizontally to the fulcrum.
It is possible. In this case, the wedge-shaped wall of the key-side fulcrum is the key height.
Formed on the two inner wall surfaces facing each other in the vertical direction.
You. Next, the action described with reference to FIGS.
The function and effect of the mass body assembly 20 as a member will be described.
Will be described in detail. (A) to (e) of FIG.
From the non-key pressed state to the maximum stroke key pressed state according to one embodiment
Mainly the pen function of the mass assembly 20 up to
It is explanatory drawing which shows operation | movement of a part in steps. Smell this figure
The let-off lever 23 is shown in a vertical section. In the non-key pressed state shown in FIG.
The assembly 20 is lowered by its own weight on the second arm 22 side.
And has returned to the position shown in FIG.
The rear end 2 of the first arm 21 contacts the lower limit stopper 32.
1b putt 27 on weight member 22a of second arm 22
Is in contact with Let-off lever 23 is the second leafs
The arm returns to the left by the biasing force of the pulling 34, and the second arm
The contact portion 23a is located below the first contact surface 22c of the second arm 22.
Side, but they are not in contact with each other
Forms a gap. When the key 5 is depressed, the drive shown in FIG.
The movement of the front end of the first arm 21 by the moving portion 5c or 5e.
The drive unit 21d is pushed down, and the first arm 21 is pivotally supported.
Left in the figure with the contact portion between the point portion 21c and the support 16 as a fulcrum
Start oscillating. Key pressing action has a certain speed
(More than pianissimo),
As shown in (b), the second arm 22 remains stationary
Then, the first arm 21 is slightly moved with the let-off lever 23.
Crab counterclockwise, second arm contact part of let-off lever 23
23a comes into contact with the first contact surface 22c of the second arm 22
You. If you press the key with a weak touch below Pianissimo,
The second arm 22 has the lower limit stopper 3
Leave 2 Subsequently, in the case of pianissimo or more, the first arc
Arm 21 and the second arm 22 through the let-off lever 23
And the whole mass body assembly 20 turns left,
It oscillates as shown in FIG.
Abuts against the upper limit stopper 33. Then the elastic piece
Turn left more while slightly bending the cantilevered piece 30a, (d)
As shown in the figure, the stopper contact portion 2 of the let-off lever 23
3b comes into contact with the upper limit stopper 33. Further, the mass body assembly 20
By turning left, the let-off lever 23 moves the shaft 28
It is turned clockwise to the center, so that it is shown in FIG.
As described above, the second arm contact portion 23a is
Releases from the contact surface 22c and releases the constraint of the second arm 22.
Good. If the touch is less than pianissimo, keep the state of (a).
It moves to the state of (b) and (c) while holding, but the elastic cantilever
After the piece 30a contacts the upper limit stopper 33, the second
Upper limit strike so that the upper gap of the
The second arm 22 is pushed down by the hopper 33. Subsequent movement
Is the same as in the case of the strong touch. Thereafter, the second arm 22 is connected to the weight member 22a.
Due to its own weight and the restoring force of the elastic cantilever 30a.
The force to return and the moment of inertia in the left-handed direction
Slightly balanced, left-handed as a whole, let-off
The second arm contact portion 23a of the lever 23 immediately
The second arm 22 contacts the second contact surface 22d of the
The back check function to hold works, and the second
Counterclockwise in the second arm 22 by the leaf spring 34
The second arm 22 is suddenly
There is no such thing as turning right. The basic function is
The weaker the touch, the more counterclockwise the second arm 22, etc.
It is sufficient to consider that the elastic moment of is small. The first arm 21 and the second arm
1 and 2, even if 22 turns clockwise more than necessary.
Abuts on the second arm locking piece 21g and is locked there.
You. The second contact surface 22d of the second arm 22 is buffered.
The second arm of the first arm 21
The pad 26 is also attached to the locking surface of the arm locking piece 21g.
Causes the second arm 22 to vibrate due to an impact.
There is no such thing. The second arc by the let-off lever 23
When the key is pressed, the grand piano
A similar static and dynamic let-off feel is obtained,
For the sake of clarity, first of all,
The definition of Noh will be explained. The let-off function is a key operation by linking keys.
After the hammer driven by the applied force touches the strings,
To give room to return to the
This function releases the interlocking part of the hammer. Back
Check function is to hold let-off hammer.
Function. The repetition function is a key release key
A function to return the hammer to the key depressable state after releasing the check
It is. Above in the piano pen assembly
Perform let-off function and repetition function
In other words, it can be said that the back check function is performed by the key.
In contrast, in the present embodiment, the mass body assembly 20 is used.
Thus, all of the above functions are performed. The static let-off feeling means that the key
Jack and hammer when pushed very slowly
And the frictional force generated by the
When releasing the interlocking part of the moved hammer,
Is a feeling of escape that occurs as a result of a decrease. Dynamic Leto
The feeling of “Hu” means that the key is struck with a strength of pianissimo (pp) or higher.
Key, the link between the key and the hammer is canceled just before the end of the keystroke
This reduces the moment of inertia during keystroke,
A feeling of escape (a feeling of escape) is born. That is, the key
During the moment of inertia decreases, the reaction force on the finger
Is the feeling of keystroke that decreases. Here, a keyboard device for a grand piano
The following are the functional features of. Static touch feeling changes too much with keystroke
Absent. There is a feeling of escape (static let-off) at the time of a weak touch. There is a dynamic touch feeling (mass feeling), releasing mass when hitting hard
There is a feeling (dynamic let-off feeling). The black and white key has the same touch feeling. According to the first embodiment of the present invention described above,
Very similar to the keyboard of a grand piano with the above features
That gives a feeling of touch. So, Grand Pier
It is said that the feeling of touch is good, but what kind of element
Clarify where and what is good
Explain what happened to the element. First, the second equation of Newton's motion is
When all the elements are taken into consideration, Equation 1 is obtained. Sandals
That is, in a system as shown in FIG.
When pressed with the force, the repulsive force on the right side of Equation 1 is generated
You. [Mathematical formula-see original document] Here, m; mass of the object (for a keyboard device)
May be considered the mass of the entire key and action member),
x: travel distance (key stroke), ks: spring constant, μ;
Coefficient of friction, N; drag, d ² x / dt ² ; Acceleration
This equation is widely known as F = mα,
If there is only a structure, it becomes like Equation 1. On a grand piano
Corresponds to item <1> in Equation 1 where the weight of the key and the action member is
In response, the same is apparently the case with conventional electronic keyboard instruments,
Since both have different action mechanisms,
m and α change its form. In a grand piano, when a spring acts,
There is also a repetition spring as an electronic keyboard instrument
The key return spring corresponds to the item <3> of Expression 1. Also, Gran
Dopiano mainly has repetition lever and hammer (low
Ruskin)
The frictional force corresponds to <2>.
There is a rubbing part that affects the touch feeling in the board instrument
I didn't. In the extreme case, the keyboard of a grand piano
The best electronic keyboard with an electronic tone generator circuit
You can get a musical instrument, but that is not cost-effective
It is. Thus, the present invention has been made. In general, exercise (do / do)
For an object, the force that the object exerts on the outside world (Equation 1)
And the force acting on the object (left side)
As described above, the touch feeling of this embodiment is as follows.
In particular, <1> and <2> are entangled with
Good let-off feeling and dynamic let-off feeling
(See FIG. 18). This will be verified in detail. First, the static let
Verify the feeling of off. First press on a grand piano
No significant frictional force occurs during the period, and the first half of the keystroke stroke
In the equation (1), the term <1> indicates that the acceleration is the gravitational acceleration.
The force applied to the finger by the key operation unit is set to approximately 50 to 60 g
Te Since both μ and N are almost zero, the term <2> is also almost zero
<3> is also zero because no spring force acts
Therefore, it moves while receiving F = Mα = 50 to 60 g. In the latter half of the keystroke stroke, the repeat
The regulating button is fastened against the spring.
The force of <3> is generated because the key is pressed. Following this
Where the hammer rests on the jack (Jack and
Frictional force increases from the contact of the hammer roller)
The force of <2> is generated. When this friction goes off
A static let-off feeling occurs. In the case of the present invention, the first half of the key press stroke is
It moves depending on F = mα in <1>. Elastic cantilever 3
0a is the latter half of the key press stroke that hits the upper limit stopper 33
(From (c) in FIG. 16), F = mα + (ks + ksh) ·
It moves depending on x and the reaction force increases. Where ksh
Is the spring constant of the elastic cantilever 30a. Then, the let-off lever 23 is moved to the upper limit stroke.
It comes into contact with the hopper 33. Mass is less than Pianissimo
The assembly 20, especially the second arm 22, has a left-handed inertia
Since it has no moment, its second arm contact part
Abutment portion between 23a and first contact surface 22c of second arm 22
Start sliding. At this time, a frictional force is generated. sand
That is, it moves depending on F = mα + μN + kso · x. This
Here, kso = ks + ksh. And let off
When the lever 23 is disengaged from the second arm 22,
Since the <2> term in equation (1) becomes almost zero, the feeling of escape (static
To get a feeling of “on”. Next, the dynamic let-off feeling will be verified.
You. In a grand piano, if the touch is more than pianissimo
The hammer is actively linked to key presses. In general, the object
It is known that inertia acts when moving and stopping.
When this inertia force is expressed in the form of an inertia moment I, I =
mr ² It becomes. Here, r is, for example, the rotation fulcrum s and the key depression.
Is the distance from the position, and the moment of inertia is
The system is made as a premise. Then, the moment of the external force is N, and the angular velocity is
Assuming that ω, N = I (dω / dt). This expression
Is clearly understood with the same concept as the term <1> in the equation (1).
Can be The moment of inertia I in the above equation is
Amount m, angular acceleration dω / dt to acceleration α, external force
When the element N is replaced by the force F,
Can be treated in the same way. In the case of a grand piano,
Is a system of all terms on the right side of Equation 1, but the most noticeable
<1>. In other words, it is necessary for the hammer to start moving
Larger reaction force due to <1> in Equation 1 in order to obtain a high inertia force
To your finger. Immediately before the end of the key press, the key and the hammer
Interlock is eliminated. That is, without receiving the power from the key,
As the hammer approaches the string, the inertia mode of the hammer
And the feeling of dynamic escape is obtained. These behaviors
Means that all the terms in Equation 1 occur at the same time.
In the latter half except the initial stage of the key, all the items that the hammer has
The same effect is applied to the finger as it has become. On the other hand, in the above-described embodiment of the present invention,
Even in this case, all the terms on the right side of Equation 1 work in the initial stage of key depression. However
And let-off lever 23 (equivalent to jack)
Fitting part with two arms 22 (mass equivalent to hammer)
In addition, as shown in FIG.
Serves the following purposes: Play of the above fitting part
(0.3mm to 1.0mm) is intended for key recovery (recurrence
Let-off lever 23 and second arm
The purpose is to make the fitting with the system 22 smooth. When the touch is more than pianissimo, the inertial force is activated.
Therefore, from the state of (a) in FIG. 16 through the state of (b),
(C), (d), (e) change the state. Therefore, the first keypress
In the first part of the period, the second arm 22 is
Does not move with sexual power. The second arm 22 is in the state of (b).
Thereafter, it starts moving toward the upper limit stopper 33. At this time
Is a full-term operation, making item <1> in equation 1 stand out.
I'm using With the weak touch, only the acceleration is small.
Therefore, in the state of (b) to (d) in FIG.
In <1>, there is no change in the force. (C) with elastic piece
From the time when the holding piece 30a contacts the upper limit stopper 33,
Kso · x increases as in the case of static let-off. (D)
μN increases (mainly N increases) and the friction surface shifts. Les
The set-off lever 23 and the second arm 22 are disengaged from each other.
Then, kso · x decreases, and the rotational moment also decreases.
(E). In the case of a strong touch, why the moment of inertia is
The mass is the element of the moment of inertia
The second arm 22 occupying most of m is released from the key
And free movement. That is, m1-m2
(M1 is the mass of the key and the entire action member, m2 is the second mass
(Mass of arm)
As a result, the moment of inertia decreases. FIG. 18 shows a key system of a keyboard device according to the present invention.
The measured results of the relationship between troke (mm) and load (reaction force: kg)
Shown in diagram. The solid line indicates that when the keypress strength is medium strong (mf),
The dashed-dotted line indicates the case of medium weak (mp), and the two-dot chain line indicates the weak (p) case.
In both cases, the keys are touched with the finger attached to the key. P
Each point of 1, P2, P3 is a let-off lever 23
Is in contact with the upper limit stopper 33. In this diagram, the dip from the maximum value
The amount (D1, D2, D3) determines the size of the dynamic let-off feeling.
The higher the keying strength, the higher the level
In the illustrated case, D1 <D2 <D3. this
In the equation of F = mα, the acceleration α has a large keying strength.
Because it is large enough, the product of mass and mα also increases
Because the mass decreases when the mass is released from the key
The reduction amount of mα (1, D2, D3 in FIG. 18) is also large.
Because The characteristic shown in FIG.
This example is very similar to the characteristics of
A dynamic let-off feeling similar to a piano
Has been demonstrated. Thus, according to the first embodiment of the present invention,
You can get the same high quality touch as a grand piano
The keyboard device can be provided relatively inexpensively. Particularly in this embodiment, the mass body main body
Two arms 22 and a pen function member (first arm 21 and
And let-off lever 23) to form an action section.
Of the mass body assembly 20, which is a material,
At the point where the mass body is released at the stroke position
Has features. This embodiment relates to a keyboard device for an electronic piano.
But it can also be used for other keyboard instruments.
As a training device for keyboard instruments such as pianos and electronic pianos
Can also be used. [Second Embodiment] Next, a second embodiment of the present invention will be described.
An example will be described with reference to FIGS. This second implementation
In this example, the keyboard is driven by an electromagnetic actuator.
This is an embodiment applied to an automatic performance keyboard device for automatic performance.
FIG. 19 shows the same non-depressed key as FIG. 1 of the first embodiment.
It is sectional drawing which follows the longitudinal direction of a white key in a state. this
The mechanism and operation of the second embodiment are almost the same as those of the first embodiment.
Therefore, the parts common to FIG.
Is omitted. This embodiment is different from the first embodiment.
Indicates a white key 5W and a black key (not shown) forming a keyboard.
5B (see FIG. 1) from the rear end face 5g.
Is provided with a rear extending portion 5h extending rearward, and thereafter
The two side walls near the end are placed on the shelf 3 for each key.
The actuator section 40a of the magnetic actuator 40
It is a point that is pivotally connected by the button 41. DD of this pivot
FIG. 20 shows a cross-sectional view along the line. That is, the key in this embodiment is a seesaw
The key is a key, and the rear extending portion 5h side is the electromagnetic actuator 4
0 by the actuator section 40a.
Key on the front end in the same way
It can be rotated around the fulcrum 6 for automatic performance.
You. The electromagnetic actuator 40 is stored in advance.
Or not based on performance information input from outside.
Power is controlled by the control circuit and the drive circuit.
Actuator 40a is protruded from the
The actuator section 40a is free. That action
The tutor section 40a is lightweight and can be pressed by a player.
At the time of performance, it hardly affects the touch feeling described above. The first embodiment (FIG. 1 and the like) and the second embodiment
As can be seen from the example (FIG. 19),
The key is obtained by devising the fulcrum structure as shown in the figure.
The key can be shorter or longer with almost no change in structure.
Can be. That is, even if the key structure is changed, the key mold
Most can be used in common. [Third Embodiment] Next, a third embodiment of the present invention will be described.
An example will be described with reference to FIG. This third embodiment is similar to the first embodiment.
The action mechanism in the embodiment is simplified.
FIG. 21 shows the keyboard device in a non-depressed state similar to FIG.
FIG. 2 is a cross-sectional view of a black key in the longitudinal direction. This FIG.
In FIG. 7, the same reference numerals are assigned to parts substantially equivalent to those in FIG.
And their explanation is omitted. Reference numeral 50 denotes a keyboard frame as a support member.
Formed by sheet metal processing of metal plate such as iron plate
Screwed and fixed to the shelf 3 of the housing (screw not shown)
You. The rear end of the upper horizontal surface 50a of the keyboard frame 50
In addition, the support member side fulcrum by resin outsert molding
54 is erected at the support position of each key, and
5 (collectively referred to as white key 5W and black key 5B)
The key-side fulcrum 56 is fitted. And a fulcrum between them
The press-contact spring 57 is engaged, and the key-side fulcrum 56 is
The fulcrum 54 is constantly pressed. As a result, each key 5 is
Up and down direction (key pressing direction) and left and right direction (key width direction
In the direction of the key length.
Support to prevent the ring. Structure of these two fulcrum parts
Are, for example, the supporting member side fulcrum 4 of the first embodiment described above.
The structure of the key-side fulcrum 6 should be reversed.
However, a detailed description thereof will be omitted. The upper horizontal surface 50a of the keyboard frame 50
A key switch through hole 50b is formed in the front of
The switch board 12 is tilted downward from the front.
Then, they are attached via the substrate holding members 58 and 59.
On the top surface of the switch board 12, two keys are provided for each key.
Key switches 51 and 52 using two bowl-shaped elastic members have key lengths.
Two keys are arranged side by side in the hand direction and are provided on the key 5.
When the key is pressed by the switch driving actuator 5d '
Is pressed in the order of the key switches 51 and 52 to turn on the contacts.
You. This is because two keys are detected at the same time when key depression is detected.
Time difference between the timing when the key switches 51 and 52 are turned on
Can detect the key pressing strength or key pressing speed
The key switches 51 and 52 are
The touch response switch. Further, the through-hole 50 of the keyboard frame 50 is provided.
Fold the cut-and-raised piece 50d cut from b to the front side
Bend it and incline it slightly upward from the horizontal,
Black key guide 14 'by resin outsert molding
And it is fitted between both side walls of each black key 5B.
Point the black keys 5B in the arrangement direction by making point contact with both side walls
I do. The front end of the lower horizontal surface of the keyboard frame 50
The rising piece 50f that rises from
A white key guide 15 'is provided by a
5W between both side walls, and point contact with both side walls
Thus, the position of the white key 5W in the arrangement direction is regulated. In the third embodiment, the action member is
A mass body arm 55 is provided for each key. This quality
The monomer arm 55 is bent in the vertical direction and extends in the key longitudinal direction.
Arm main body 55a and
And a weight member 55b extending rearward. The arm body 55a is a molded article made of resin.
As with the first arm 21 of the first embodiment,
55h and reinforcement provided at intervals in the longitudinal direction
The rib-like portions 55i of the
The flat portion 55j formed is thin and has a sufficient strength.
Prevent sinking during molding while securing the degree
As light as possible so that the center of gravity of the entire mass arm
It is made to be near the end. The arm body 55a is bent upward at the front.
A columnar swing fulcrum 55c is formed at the lower edge of the curved portion.
And the swinging fulcrum 55c of the keyboard frame 50
A support formed by bending the cut-and-raised piece 50e into an inverted L-shape
It is placed on the support pad 61 stuck on the holding portion 50g.
You. So as to be opposed to the swing fulcrum 55c at an interval.
An auxiliary fulcrum portion 55e having an outer periphery formed in an arc shape;
Close to the auxiliary pad 62 attached to the lower surface of the support 50g
Let me. The supporting pad 61 and the auxiliary pad 62 are
Is felt. Then, at the front end of the arm body 55a,
Is formed with a driven part 55d, in which the first real key of the black key 5B is formed.
Near the free end of the extension 5b or the white key 5W similar to the embodiment.
Engage the provided drive unit (actuator) 5c or 5e
Then, the press-contact spring 60 is engaged between them, and the drive unit 5c
Alternatively, 5e and the driven portion 55d are always in pressure contact with each other. The weight member 55b is made of a metal such as iron having a large mass.
Metal material, fitted to the rear end of the arm body 55a, screwed,
Secured by bonding, etc., and the rear end is cranked upward
The cap 63 is fixed thereto. That
The cap has a downwardly facing conical rubber piece
The convexity 63a is also formed by an upwardly conical rubber piece or the like on the upper surface.
Elastic projections 63b are provided. The elastic projections 63a and 63b face each other.
The lower limit stopper 64 on the lower upper surface of the keyboard frame 50.
And upper limit stoppers 65 are provided on the upper and lower surfaces, respectively.
You. The lower limit stopper 64 and the upper limit stopper 65
The elastic projections 63a and 63b are made of
To prevent bouncing when swinging the mass body arm 55
And at the same time regulate the swing range. Also in this embodiment, the free end of the black key 5B is adjacent
End of the white key passing through the lower side of the operation unit 5S of the white key 5W
Direction, and a black key driving unit 5
c, the same as in the first embodiment (FIG. 1, etc.)
Driving member (mass body arm 55 or key switch 51,
52) The stroke accuracy for the driving unit is improved. Further, the operation section of the black key 5B or the white key 5W is depressed.
When lowered, the mass body arm is driven by the driving unit 5c or 5e.
The driven portion 55d of the drum 55 is pushed down, and
A certain mass body arm 55 is centered on its swing fulcrum 55c.
In the direction shown by the arrow E in FIG. Thereby weight members
55b rises, and the center of gravity of the mass body arm 55 moves.
However, the amount of movement of the center of gravity swings
The distance from the fulcrum to the point of engagement between the drive unit and the driven unit, and the swing support
It is enlarged according to the ratio of the distance from the point to the center of gravity. this
Works like a hammer on a grand piano,
Depending on the keystroke strength of the player's finger by the moment of inertia
Gives a touch feeling. Then, the elastic projection 63b is moved to the upper limit stopper 6
5, swing of mass body arm 55 absorbs shock
While stopping, bouncing is prevented. Then key release
Then, the mass body arm 55 reverses the arrow E due to its own weight.
The key 5 is raised and returned in conjunction with the rotation.
You. Therefore, this keyboard device has a spring for key recovery.
There is no provision. According to this embodiment, a conventional key of this kind
Panel device (for example, see Japanese Utility Model Publication No. 5-954
Stroke accuracy of the action member compared to
And improved touch feeling and lower cost
Can be measured as in the case of the first embodiment described above.
Similar, but supplemented with reference to FIG.
explain. BK, WK and Gb in FIG.
Gw is the black key 5B and the white key 5W in FIG.
FIG. 23 corresponds to mass body arms 55 for the black key and the white key.
The fulcrum O, the swing fulcrum Q, and the position P in FIG.
1 and the key-side fulcrum 56 in FIG.
Swinging fulcrum, the swinging fulcrum 55c of the mass body arm 55
Oscillating fulcrum by the contact part with the holding pad 61, key driving part 5
Drive position of the mass body arm 55 by c or 5e (driven
(Engagement position with the portion 55d). First, description will be made from the viewpoint of stroke accuracy.
From the fulcrum O of the white key WK and the black key BK to the action member G
w, Gb driving position P (provided below this driving position P)
When the key switch is pressed by the actuator AT
If the distance to L) is L, this is the black and white key
It is assumed that they are the same, and from the fulcrum O to the key depression position Pw of the white key.
The distance is W1, the distance from the fulcrum O to the key depression position Pb of the black key.
Is B1, the stroke accuracy of the white key is L / W1 ≒
1 (because W1 ≒ L). On the other hand, the stroke accuracy of the black key is L / B1
≒ 1.2. The higher the value, the better the accuracy
However, in a conventional keyboard device, generally, L <B1 <W
Since the relationship was 1, this value was less than “1”.
In particular, the stroke accuracy for white keys was poor. This numerical value is merely an example.
According to the embodiment, the driving position of the action member is set for both the white key and the black key.
It is near the operation position of the white key.
The error is not magnified at the operation position (the accuracy is 1
As described above, in the case of a black key, it is rather reduced. And
Therefore, the stroke accuracy is improved. About touch feeling (reaction force received by finger)
Is to make the touch feeling of the white key WK and the black key BK the same.
May be in the relationship of W1 / B1 = a '/ a. here
Where a and a 'are action parts for a white key and a black key, respectively.
The horizontal distance between P and Q of the materials Gw and Gb. Soshi
From the swing fulcrum Q of the action members Gw and Gb.
Assuming that the horizontal length of the part (part B) is b, b ', b / b'
Since a≫1 (b / a = 3 to 4), b ′ = b
That is, the B part is the same for the black and white key, and the short A part is slightly changed
It is possible to realize the same touch feeling of the black and white key only by using the same. For example, when a = 50 mm b = 200 mm a '/ a = 1.2 for the sake of simplicity, b' = b 'and a' = 1.2a = 60 mm
And the B part of the action member for the black key
It only needs to be 10mm longer than the B part of the
You. This can be allocated in the key longitudinal direction.
Therefore, the action members for the white key and the black key, that is, FIG.
The mass body arm 55 in 1 is arranged at almost the same position
be able to. By doing so,
All stoppers and support member side fulcrum can be used for all keys
You. Further, in the embodiment shown in FIG.
The right long part of the body arm 55 from the dashed line Y-Y is white.
The key and black key are formed identically, and only the short part on the left is white
The key is slightly shorter than the black key.
Even in this case, the support portion 50g and the support pads on the upper and lower surfaces thereof are also provided.
61 and auxiliary pad 62, lower limit stopper 64 and upper limit strike.
The wrapper 65 is common to all keys and is disposed in the key arrangement direction in a slender manner.
ing. The resin such as the mass body arm 55
In order to mold parts, use an undercut avoiding structure
In principle, two molds should be sufficient, but in practice,
A divided mold divided into eight pieces is used. The reason is processing
For ease of operation and partial
It is only necessary to change the lock. So this
The arm body 55a of the mass body arm 55 of the embodiment is formed.
To the left side from the dashed line Y-Y for the white key and the black key.
Since only the parts need to be changed, most of the split molds
It can be used. For example, the common split mold for the right part
Combine the split mold for molding the left part of the key
The required number of arm bodies 55a are manufactured and then
Replacing only the split mold for minute molding with the one for the black key,
The required number of black key arm bodies 55a can be manufactured.
Wear. Therefore, the type of mold used is significantly less
Therefore, cost reduction can be achieved. [Fourth Embodiment] Next, a fourth embodiment of the present invention will be described.
An example will be described with reference to FIG. FIG. 22 shows a second embodiment of the present invention.
The black key in the non-depressed state similar to FIG.
FIG. 2 is a cross-sectional view along a longitudinal direction, which is the same as or corresponds to FIG.
The same reference numerals are given to the parts to be described, and their descriptions are omitted.
Abbreviate. In the fourth embodiment, an action member is provided.
And a driven member driven by a key drive unit
Only a key switch is provided. Therefore,
2 Through hole 2a for key switch formed in front of frame 2
The switch substrate 12 is mounted on the lower surface of the substrate holding member 7.
1, 72. The switch board 12
Key switch 73 using a bowl-shaped elastic member on the upper surface of
The bowl-shaped elastic member is provided with a through hole 2.
a. The free end of the black key 5B is connected to the adjacent white key 5W.
Extension extending toward the free end through the lower side of the
At the tip (free end) of the setting part 5b, a key switch is directed downward.
By protruding the driving actuator 5i, the corresponding key switch
The switch 73 faces the bowl-shaped elastic member. Virtual in the figure
The key switch also faces downward near the free end of the white key 5W indicated by the line.
Switch driving actuator 5j, and a corresponding key
The switch 73 faces the bowl-shaped elastic member. 74 is
Arranged near the rear side of the black key guide 14 on the first frame 1
Stopper common to black and white keys installed.
The key is attached along the key arrangement direction in common. According to this embodiment, both the black and white keys are swung.
Position with sufficient distance from the fulcrum (with white key operation position
(Near) the key switch driving actuators 5j and 5i
Provided, the key switch 7
The error of the position where 3 turns ON is not enlarged,
The stroke accuracy at the sound start point can be improved. In addition, almost the same accuracy can be obtained with a black-and-white key.
Key switch 73 is also located at the same position in the key longitudinal direction.
It is sufficient to arrange the switch board 12 along the direction.
There is no complication and the assemblability is good. Note that the key switch
As shown in FIG.
May be provided with a touch response switch
No. [Other Application Examples] Each of the above-described embodiments of the present invention
The embodiment includes a key switch, and the key switch
An electric signal that generates a musical tone using an electronic tone generator circuit in response to the N signal.
Keyboard devices for electronic keyboard instruments such as child pianos and electronic organs
By way of example, the keyboard device according to the invention is not limited to this
is not. For example, directly or by key operation
Vibrating sounding bodies such as strings and diaphragms through the
A keyboard instrument that opens and closes a valve to generate a blowing sound, or
Is a keyboard electric instrument that electrically amplifies its pronunciation and emits sound.
Furthermore, pianos and electronic pianos with action mechanisms
It can also be applied to the practice keyboard device. As described above, according to the present invention,
Keyboard devices can absorb dimensional errors even when the key length is long.
Key drive over all strokes
Can be. In that case, screw between each key and the key guide member.
There is no acting force in the direction of
And smooth key operation is possible. The key-side fulcrum has a wedge-shaped wall.
The supporting member side fulcrum by the urging force of the urging means.
Because it is pressed against the protruding body, there is play due to the wedge effect
No noise is generated, and no self-alignment is performed.
There is also an effect. The rear face of the wedge-shaped wall forming part of each key is the key rear end face
As a result, the strength of the key-side fulcrum increases,
Then, by extending the end face to the rear, it becomes a seesaw type key.
can do. Set the key-side fulcrum behind the operating part of each key.
When it is provided in the middle part of the key longitudinal direction, it becomes a seesaw type key,
Automatic performance by operating each key using an electromagnetic actuator
Key device that can perform
Work becomes possible. Furthermore, the degree of freedom in design is increased, and
For keys that have a completely different touch, such as
Even if the structure of the swing fulcrum is shared, it is molded
It is also possible to share part or all of the mold when
Can be

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view along a longitudinal direction of a black key in a non-key pressed state of a keyboard device according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of the white key in the maximum stroke key pressed state along the longitudinal direction. FIG. 3 is a partial plan view of the keyboard device with keys partially removed therefrom. FIG. 4 is a sectional view in the key width direction showing a contact state between a white key 5W and a white key guide 15 in FIG. 2; FIG. 5 is a first leaf spring 24 shown in FIGS. 1 and 2;
FIG. 6 is a plan view of the let-off lever 23. FIG. FIG. 7 is a plan view of the second leaf spring 34; FIG. 8 is an enlarged plan view of the vicinity of the supporting member side fulcrum portion 4 surrounded by a dashed line L in FIG. FIG. 9 is a sectional view taken along line XX of FIG. 8; FIG. 10 is a rear view as viewed from a direction indicated by an arrow M in FIG. 8; FIG. 11 is a perspective view of the same seen from diagonally forward. FIG. 12 is an enlarged perspective view of a main part of the key turned upside down and the vicinity of the key-side fulcrum 6 viewed obliquely from the front. 13 is a cross-sectional view taken along the line CC of FIG. 15 in a state where the key shown in FIG. 12 is supported by the protrusion shown in FIG. 11; FIG. 14 is a sectional view taken along line AA in FIGS. 8 and 13; FIG. 15 is a sectional view taken along the line BB in FIGS. 8 and 13; FIG. 16 shows a mass assembly 20 from a non-key pressed state to a maximum stroke key pressed state according to the first embodiment of the present invention.
FIG. 7 is an explanatory diagram showing, in a step-by-step manner, mainly the operation of the wippen function part. FIG. 17 is a principle diagram showing a motion system of an object for explaining the operation of this embodiment. FIG. 18 is a diagram showing a measurement result of a relationship between a key press stroke and a load by the keyboard device of the present invention. FIG. 19 is a cross-sectional view of a white key in a non-depressed state similar to FIG. 1 along the longitudinal direction, showing the second embodiment of the present invention. FIG. 20 is a sectional view taken along the line DD in FIG. 19; 21 is a cross-sectional view of a black key in a non-depressed state, similar to FIG. 1, showing a third embodiment of the present invention, taken along the longitudinal direction. FIG. 22 is a sectional view of a black key in a non-depressed state similar to FIG. 1 along a longitudinal direction, showing a fourth embodiment of the present invention. FIG. 23 is a diagram for explaining an improvement in stroke accuracy and a common action member for a monochrome key according to a third embodiment of the present invention. [Description of Signs] 1... 1st frame (supporting member), 2.
... Shelves (keyboard support stand) 4 ... Support member side fulcrum, 4a
... Base, 4b, projecting body, 4c, cylindrical surface, 4f, bulging portion (curved surface corresponding portion), 5: key, 5W: white key, 5B: black key, 5
b ... extended part of black key, 5c: drive part of black key, 5d, 5
d ', 5i, 5j ... key switch driving actuator,
5e: white key driving portion, 5g: rear end surface, 5h: rearward extending portion, 6: key side fulcrum portion, 6a, 6b: wedge-shaped wall surface, 6c: wedge-shaped wall surface forming portion, 6d: concave curved surface, 7: leaf spring (Biasing means): 10: body cover, 12: switch board, 13:
Key switch, 14, 14 '... Black key guide, 15, 15'
... White key guide, 15a bulge, 6 support, 20 mass assembly (action member), 21 first arm (action member main body), 21c oscillating fulcrum, 21
d: driven part, 21e: elastic piece, 21g: second arm locking piece, 22: second arm (mass body), 22a: weight member, 22b: molded part, 22c: first contact surface, 22d ... Second contact surface, 23 ... Let-off lever, 23a ... Second arm contact portion, 23b ... Stopper contact portion, 24 ... First leaf spring, 25, 28 ... Shaft, 26, 27, 31 ... Pat, 29 ... Cushioning material, 30 cap, 30a elastic cantilever, 32 lower limit stopper, 33 upper limit stopper, 34
... second leaf spring, 40 ... electromagnetic actuator,
40a: Actuator section, 41: Pin, 50: Keyboard frame (support member), 51, 52: Key switch, 54 ...
Supporting member side fulcrum, 55: mass body arm (action member), 55a: arm body, 55b: weight member, 55c
... Oscillating fulcrum, 55d. Driven part, 55e. Auxiliary fulcrum, 56. Key fulcrum, 57.
Caps, 63a, 63b ... conical elastic projections, 64 ...
Lower limit stopper, 65 Upper limit stopper, 71, 72 Board holding member, 73 Key switch, 74 Key stopper

Claims (1)

Claims: 1. A keyboard device having a keyboard comprising a support member and a plurality of keys swingably provided around a fulcrum with respect to the support member, wherein: A wedge-shaped wall forming part having a wedge-shaped wall is formed on two inner walls facing the key width direction or the key height direction behind the operation unit, and one wall of the wedge-shaped wall forming part is defined as a plane, and the other wall is formed. A curved surface is formed to form a key-side fulcrum portion, and the support member is provided with a projection that fits between the wedge-shaped wall surfaces of the keys, and the projection has one of the wedge-shaped wall surfaces of the key. A supporting surface on a supporting member side is provided by providing a plane surface and a column surface that makes line contact at the time of the fitting, and a curved surface corresponding portion that contacts a curved surface formed on the other of the wedge-shaped wall surfaces with a point or a small area close thereto at a point. The key is arranged on a support member, and is inserted into the key so as to be positioned in the key arrangement direction. Keyboard apparatus is characterized by providing a key guide for regulating the.