JP2003195853A - Keyboard device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To maintain a secure stop feeling for a long period while suppressing rebounding of a turning member, a shock to a finger, and a shock sound in full keying. <P>SOLUTION: A hammer 2 rotates associatively with a key 1 which is pressed and when the hammer nearly reaches its turning end position, the free end 2d of the hammer 2 abuts against a first cushion 17 which is slightly hard and an upper stopper 10 almost at the same time. Then a 'mass part MA' composed of the 1st cushion 17, the other end part 15b of a leaf spring 15, and a mass body 16 moves up and the mass body 16 abuts a little later against a second cushion 18 which is rather soft and energy is absorbed. When the free end part 2d abuts against the 'mass part MA', a large amount of the kinetic energy of the hammer 2 is transmitted to the 'mass part MA' so that the kinetic energy of the hammer 2 is reduced. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard device having a rotating member which is rotated by a key depression operation.

[0002]

2. Description of the Related Art Conventionally, a mass hammer body, which is a rotating member having an appropriate mass, is driven by a key depression operation to be pivoted so as to obtain a natural feel of a key depression like an acoustic piano. A keyboard device is known (Patent Document 1 below).

In this device, for example, the mass hammer body is driven by the front part of the key, and the rear part of the mass hammer body is rotated in the vertical direction in conjunction with the key pressing operation. In addition, an upper limit stopper that regulates the rotation end position of the mass hammer body is usually provided, and in a normal key depression operation, when the mass hammer body comes into contact with the upper limit stopper, key depressing (stroke stroke) is performed. As the upper limit stopper, for example, a foam material such as felt or elastomer is used to receive the inertia of the mass hammer body.

There is also a device in which the key itself which is depressed is a rotating member with appropriate mass distribution.

[0005]

[Patent Document 1] Japanese Patent No. 3060930

[0006]

However, if the upper limit stopper for stopping the rotating member is too hard, the rotating member is likely to bounce off the upper limit stopper, and the player's finger receives an excessive impact and a large impact. Sound is generated. In particular, as in the device of Patent Document 1, the mass hammer body as the rotating member generally has a long distance from the rotating fulcrum to the free end portion, which expands the movement of the key, so that the free movement is particularly great when smashing. The movement of the edge is fast. Therefore, the above tendency becomes stronger. On the other hand, if the upper limit stopper is too soft, a firm stop feeling cannot be obtained, and the feeling of key depression is unstable and it is difficult to play.

Further, the mode of change of the reaction force due to the contact between the rotating member and the upper limit stopper affects the let-off feeling, and only the reaction force of the upper limit stopper gives a good let-off feeling like that of an acoustic piano. It is difficult.

Further, when the rotating member is repeatedly abutted strongly against the upper limit stopper, the upper limit stopper is deformed due to aging, and when the rotation end position of the rotating member is displaced, the key is rotated by pressing the key. The end position may vary from key to key, and the feeling of pressing the key may deteriorate.

As described above, by merely setting the hardness of the upper limit stopper, when the key is pressed, strong rebound of the rotating member, excessive impact on the finger, and a large impact sound are suppressed, and a firm stop feeling is obtained. However, there is a problem that it is difficult to maintain for a long time.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and its object is to suppress the rebound of the rotating member at the time of pressing and depressing the key, the impact on the finger and the impact sound, and to firmly prevent the impact. An object of the present invention is to provide a keyboard device capable of maintaining such a stop feeling for a long period of time.

In addition, in the acoustic grand piano, the key and the hammer are separated immediately before the hammer hits the strings. That is, when the jack rod pushes up while rubbing the spin roller, the mass of the key and the hammer was applied at the beginning of key depression, but the mass of the key alone is applied as the hammer moves freely. Then, the hammer hits the strings and bounces back, and is received by the back check mechanism. In other words, the feeling of stop in a grand piano becomes extremely light. However, in the keyboard device that is configured to artificially obtain the above-mentioned key pressing feeling, it is still difficult to realize such feeling, so in the present invention, in order to bring the key pressing feeling closer to the grand piano as much as possible, The configuration is as described below.

[0012]

In order to achieve the above object, a keyboard device according to a first aspect of the present invention has a plurality of rotating members which are respectively rotated by a key depression operation, and has elasticity, and the rotating member is provided. The rotary member includes a stopper portion that abuts on the member to substantially limit the rotation end position of the rotating member, and a mass portion that is movably held in the rotation direction of the rotating member. The moving member is configured to come into contact with the stopper portion at substantially the same time as it comes into contact with the mass portion.

According to this structure, the rotating member is rotated by the key depression operation and comes into contact with the stopper portion to substantially regulate the rotation end position. The rotating member comes into contact with the stopper portion almost simultaneously with the contact with the mass portion, and the mass portion moves in substantially the same direction as the rotating direction of the rotating member, so that the kinetic energy of the rotating member is increased. Therefore, the kinetic energy received by the stopper portion is smaller than that in the case where the mass portion is not provided. Therefore, the rotating member is unlikely to bounce off the stopper portion, so that the player's finger is not subjected to an excessive impact and a large impact sound is not generated. In addition, the secular change of the stopper portion is reduced. Therefore, it is possible to maintain a firm stop feeling for a long period of time while suppressing the rebound of the rotating member, the impact on the finger, and the impact sound when the key is pressed down.

In order to achieve the above-mentioned object, a keyboard device according to a second aspect of the present invention has a plurality of rotating members each of which is rotated by a key pressing operation, and has elasticity, and abuts on the rotating members. The rotation member has a stopper portion that substantially regulates the rotation end position, and a mass portion that is movably held in the rotation direction of the rotation member. When the member abuts on the mass portion and the stopper portion, at least immediately after the abutment, the kinetic energy of the rotating member given by the key pressing operation is the strain energy due to the elastic deformation of the stopper portion and the strain energy. It is configured to be converted into kinetic energy of the mass part.

According to this structure, the rotating member is rotated by the key pressing operation and abuts on the stopper portion to substantially regulate the rotation end position. By the key pressing operation, the rotating member comes into contact with the mass portion and the stopper portion, so that the kinetic energy of the rotating member given by the key pressing operation is distorted by elastic deformation of the stopper portion at least immediately after the contact. Since the energy is converted into the kinetic energy of the mass part, the kinetic energy received by the stopper part is smaller than that in the case where the mass part is not provided. Therefore, similarly to the first aspect, it is possible to maintain a firm stop feeling for a long period of time while suppressing the rebound of the rotating member, the impact to the finger, and the impact sound at the time of pressing and depressing the key.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing the configuration of a keyboard device according to the first embodiment of the present invention. The keyboard device of the present embodiment is mainly composed of a chassis 4, a key 1, and a hammer 2 for giving an appropriate inertia to a key pressing operation to obtain a key pressing feeling like an acoustic piano. The hammer 2 is provided corresponding to each key 1. The black key has the same structure as the key 1, and is rotatably supported by the chassis 4. The player side of this device will be referred to as the front side.

The key 1 and the hammer 2 are constructed so as to be vertically rotatable about their respective rotation shafts, that is, the key rotation shaft P1 and the hammer rotation shaft P2. The key 1 is configured to be capable of driving the corresponding hammer 2, and the hammer 2 is the switch unit 3
Is configured to be driven.

2 and 3 are longitudinal sectional views taken along the line AA of FIG. 2 shows a non-key-depressed state (state in which the key 1 is at the start position of the key-depression stroke), and FIG. 3 shows a state of key depression (state in which the key 1 is at the end position (push-off position) of the key-depression stroke). .

The key 1 is provided with a convex spherical key fulcrum portion 1a on its rear end side surface. The center is the key rotation axis P1. On the other hand, the chassis horizontal portion 4a of the chassis 4
A key support 5 is provided behind the key. A concave portion 5a is provided in a portion of the key support portion 5 facing the key fulcrum portion 1a so as to correspond to each key fulcrum portion 1a (see FIG. 1). The key fulcrum portion 1a is engaged with the concave portion 5a of the key support portion 5 so that the key 1 is rotatable in the up-down direction about the key fulcrum portion 1a (key pivot axis P1).

On the front part of the key 1, there is provided a hammer driving piece 1b hanging downward. A cushioning material 13 made of urethane rubber or the like is attached to the lower end of the hammer driving piece 1b. The cushioning material 13 is sandwiched between the upper extending portion 2c and the lower extending portion 2b of the hammer 2, and transmits the key pressing operation of the key 1 to the hammer 2 and the returning operation of the hammer 2 to the key 1. To do. In the process of key depression and key depressing, the cushioning material 1
3, the upper end of the hammer 3 is always in contact with the upper extension 2c of the hammer 2 to ensure the transmission of motion.

The chassis 4 is reinforced by connecting the chassis horizontal portion 4a and the front portion 4b of the chassis 4 by ribs 12. A key guide 6 for restricting rotation in the key arrangement direction (lateral direction of the key 1) is provided on the chassis front portion 4b so as to project for each key 1.

A hammer 2 is provided corresponding to each key 1,
Hammer support portion 9a of the support member 9 provided on the chassis 4
A free end 2d of the (hammer rotation axis P2) is supported by a hammer fulcrum 2a so as to be vertically rotatable. Further, a fork-shaped spring 7 having a bifurcated front side is suspended from the vicinity of the hammer fulcrum portion 2a to the rear portion of the key 1. This spring 7 locks the key 1 into the key support 5
The hammer 2 is pressed against the hammer support portion 9a of the support member 9 while being pressed against, so that the key 1 and the hammer 2 do not easily fall off the chassis 4.

In the hammer 2, the weight of the mass member 2f constantly urges the key 1 upward by the lower extension 2b. The restoring force of the key 1 is not given by the spring 7,
This is due to the restoring force of the hammer 2 itself. Hammer 2
A switch drive unit 2 for driving the switch unit 3 at the bottom
have e.

An upper stopper 10 (stopper portion) such as felt is provided on the rear portion 4d of the chassis 4, and a lower stopper 11 is provided on the chassis holding portion 4c.
The upper stopper 10 is formed, for example, to have a length that extends over the entire key width, and contacts the mass member 2f of the hammer 2 when the key is pressed to contact the key 1.
Also, the rotation end position of the hammer 2 (the lower limit position of the front end portion in the key 1 and the upper limit position of the free end portion 2d in the hammer 2) is restricted. The lower stopper 11 contacts the mass member 2f of the hammer 2 when the key is not pressed to regulate the upper limit position of the front end of the key 1. The upper stopper 10 may be provided for a plurality of keys or for each key.

A switch board 8 is attached to the chassis front portion 4b, and a switch portion 3 is provided on the switch board 8. The switch portion 3 is provided for each hammer 2 so as to face the switch driving portion 2e of the hammer 2. The switch unit 3 is a contact time difference type two-make touch response switch, and detects the key pressing operation of the key 1.

A kinetic energy dispersion mechanism ME is provided behind the key 1 in the chassis 4. The kinetic energy dispersion mechanism ME is composed of a leaf spring 15, a mass body 16, first and second cushions 17 and 18, and the like.

The leaf spring 15 is provided corresponding to each key 1, is made of metal and has a U-shape in a side view, and one end portion 15 a is attached to the support portion 14. The other end 15b of the leaf spring 15
The mass body 16 is on the upper surface and the first cushion 17 is on the lower surface.
, But they are fixed. The mass body 16 and the first cushion 17 are vertically movable due to the elasticity of each leaf spring 15. The second cushion 18 is provided in common for all keys, and has a gap between the second cushion 18 and the mass body 16, and the rear cover 1
9 is fixed to the lower surface of the ceiling portion 19a.

The first cushion 17 is substantially the same as the free end 2d of the hammer 2 abutting the upper stopper 10 when the hammer 2 is rotated by a key pressing operation.
The position in the height direction is set so that it also comes into contact with 7. As a result, the kinetic energy of the hammer 2 is dispersed, as will be described later.

The first cushion 17 receives the hammer 2 in the vicinity of the rotation end position of the hammer 2 and serves to absorb the impact noise, so that it is made of a relatively hard cushioning material. On the other hand, the second cushion 18 is the first cushion that receives the hammer 2.
It is for receiving the mass body 16 moving upward together with the cushion 17 and absorbing the kinetic energy thereof.
Therefore, even if the hardness is set to be soft, it does not affect the feeling of stopping when pressing the key, and the energy is absorbed efficiently so that the speed at which the mass body 16 returns to the hammer 2 direction again does not become too fast. It is composed of a material that has excellent softness.

The mass body 16 is made of a material having a certain amount of mass such as a metal in order to have inertia, and is composed of a first cushion 17, the other end portion 15b of the leaf spring 15 and the mass body 16. Occupies most of the mass. Leaf spring 1
5 is a mass body 1 that has moved due to the impact force of the hammer 2.
6 is returned to the original position (position shown in FIG. 2).

In this structure, when the key 1 is pressed,
The hammer 2 is driven and rotated by the hammer driving piece 1b of the key 1. Then, as shown in FIG. 3, when the hammer 2 reaches the vicinity of its rotation end position, the free end portion 2d of the hammer 2 is
Contact the first cushion 17 and the upper stopper 10 substantially at the same time.

Then, the "mass part MA" moves upward,
The mass body 16 contacts the second cushion 18 soon. Since the free end portion 2d of the hammer 2 comes into contact with the "mass portion MA", most of the kinetic energy of the hammer 2 is "mass portion M".
As a result, the kinetic energy of the hammer 2 is effectively reduced. Here, the mass of "parts by mass MA" m _a (kg),
The moving speed of the “mass part MA” after the contact with the hammer 2 is v _a
When (m / s), to be considered a spring force and frictional force, etc., the "m _a v _a ^2/2" to the corresponding kinetic energy (J) is shifted from the hammer 2 to "parts by mass MA" become. As a result, the amount of kinetic energy of the hammer 2 that should be absorbed by the upper stopper 10 decreases.

Therefore, since the hardness of the upper stopper 10 can be set to be relatively soft, strong rebound of the hammer 2, excessive impact on the finger of the player, generation of a large impact sound, etc. are suppressed. Moreover, a solid stop feeling is obtained. Further, it is resistant to aging and deformation of the upper stopper 10 is suppressed, and as a result, a good feeling of key depression is maintained for a long period of time.

The "mass part MA" with which the hammer 2 abuts
Is separated from the hammer 2, the hammer 2 receives a large reaction force from the “mass portion MA” at the time of contact, and then the reaction force rapidly decreases. After that, the hammer 2 receives a large reaction force from the upper stopper 10. Therefore, when the key is pressed down, the change in the reaction force received by the hammer 2 is
In the grand piano, it becomes relatively close to the change in the reaction force that the key receives through the hammer action, and a good let-off feeling is obtained.

On the other hand, when the mass body 16 comes into contact with the second cushion 18, since the second cushion 18 is soft, most of the kinetic energy of the "mass part MA" is absorbed. Then, due to the own weight of the “mass part MA” and the spring force of the leaf spring 15, the “mass part MA” returns to the original position while damping the vibration.

The free end 2d of the hammer 2 may come into contact with the first cushion 17 before the upper stopper 10, and, on the contrary, hit the upper stopper 10 before the first cushion 17. You may touch. That is, since the upper stopper 10 is made of a material that is considerably softer than that of the first cushion 17, the free end 2d is once attached to the first cushion 17 due to the difference in hardness setting between the upper stopper 10 and the first cushion 17. If they come into contact with each other, the impact received by the upper stopper 10 thereafter is significantly reduced. Therefore, a slight error is allowed in the arrangement of both in the height direction, and the upper stopper 10 of the hammer 2 and the first cushion 17 are allowed.
The time difference of abutting against is somewhat acceptable.

A further consideration of this will be as follows. That is, when it is considered that the mass is concentrated on the free end 2d of the hammer 2, the mass of the mass concentrated portion is m _h , the speed of the free end 2d of the hammer 2 immediately before the contact is v _h , the upper side. Assuming that the elastic constant (corresponding to the spring constant) of the stopper 10 is k (N / m) and the deformation amount of the upper stopper 10 is x (m), the free end portion 2d of the hammer 2 has just before contact. The kinetic energy E1 (J), the strain energy E2 (J) due to the elastic deformation accumulated in the upper stopper 10 immediately after the key pressing and the kinetic energy E3 (J) of the “mass part MA” immediately after the key pressing are calculated by the following formula 1 It is represented by 2, 3.

[0039]

[Number 1] ^{_{E1 = m h v h 2/}} 2

[0040]

[Number 2] E2 = kx ^2/2

[0041]

Equation 3] ^{_{E3 = m a v a 2/}} 2 Then, the acceleration of the hammer 2, the spring force of the leaf spring 15, various frictional forces, if excluding the influence of losses due to viscoelastic, the following Equation 4 is established.

[0042]

## EQU00004 ## E1 = E2 + E3 That is, the kinetic energy E1 which the free end portion 2d of the hammer 2 had immediately before the contact was dispersed into the strain energy E2 of the upper stopper 10 and the kinetic energy E3 of the "mass portion MA". To be converted. Therefore, the free end 2d is the upper stopper 1
Whichever of 0 and the first cushion 17 is abutted first, it may be set so that the kinetic energy E1 is appropriately dispersed into the strain energy E2 and the kinetic energy E3,
Further, what kind of stop feeling is provided can be arbitrarily defined by the setting mode of the dispersion of the kinetic energy. In that case, the hardness of the upper stopper 10 and the first cushion 17, the mass of the “mass part MA”, and the height relationship between the upper stopper 10 and the “mass part MA” are the main design factors that determine the dispersion setting. Become.

There are various modes of actual key depression. For example, even in the case of a hard hit, the hammer 2 may reach the turning end position in a state that the hammer 2 is strong only at the beginning of the key depression and the interlocking relationship with the key 1 is almost broken. In this embodiment, the upper extension 2c, the lower extension 2b, and the cushioning material 13 of the hammer 2 are used.
Since the hammer 2 and the key 1 are connected in the vertical direction, the hammer 2 actually pulls the key 1 in the latter half of the forward rotation stroke. On the other hand, the acceleration due to the key pressing force continues to be applied throughout the entire turning process, and the key 1 and the hammer 2
The rotation end position may be reached in a state where the interlocking relationship with is maintained. In this state, the key 1 continues to urge the hammer 2 to the end (rotation end position). As shown in Japanese Patent No. 2956180, since the dynamic characteristic of the key is approximated by a linear differential equation, strictly speaking, the mechanical action in the vicinity of the rotation end position is different between the former and the latter, I can't discuss the feeling of pressing a key in the same row. Especially in the latter,
In addition to the speed of the hammer 2 and the mass of the “mass part MA”, the acceleration of the hammer 2 at that time, the spring force of the leaf spring 15, and various frictional forces influence the key touch feeling.

In any case, however, the hammer 2 is finally received by the upper stopper 10, the kinetic energy of the hammer 2 rapidly disappears at the turning end position, and the upper stopper 10 is removed. Since less kinetic energy is required, there is less impact and the key 1
It will give you the feeling that you have stopped firmly.

According to this embodiment, the hammer body 2 contacts the upper stopper 10 at substantially the same time as the first cushion 1 is pressed.
7, the mass portion MA moves upward and comes into contact with the second cushion 18, so that the kinetic energy of the hammer body 2 is absorbed by the second cushion 18 via the mass portion MA. Kinetic energy received by the upper stopper 10 is reduced as compared with the case where the MA is not provided. Therefore, the hammer body 2 is unlikely to bounce off the upper stopper 10, so that the player's finger is not subjected to an excessive impact and a large impact sound is not generated. In addition, the secular change of the upper stopper 10 is reduced. Therefore, it is possible to maintain a firm stop feeling for a long period of time while suppressing the rebound of the hammer body, the impact on the finger, and the impact sound when the key is pressed down. Further, since the unevenness of the height of the upper surface of the key due to the shrinkage of the upper stopper 10 due to aging is eliminated, it is possible to maintain the ease of playing the glissando playing method and the like for a long period of time.

Although the mass body 16 is supported via the leaf spring 15, the mass body 16 is not limited to this, and the mass body 16 after the hammer 2 contacts the first cushion 17 is the free end portion 2d of the hammer 2. It may be supported by another method as long as the mass body 16 can be moved in substantially the same direction as the rotation direction and the mass body 16 can be quickly returned to the original position.

The rear of the hammer 2 rotates as the free end 2d, but the present invention is not limited to this, and the present invention can be applied to the case where the free end is provided at the front.

(Second Embodiment) In the second embodiment of the present invention, the "mass part MA" is different from the first embodiment.
"Mass part MB" instead of "mass part MB"
The difference is that the holding mode is changed, and the other points are the same as in the first embodiment.

FIG. 4 is a vertical cross-sectional view of a keyboard device according to a second embodiment of the present invention, showing a non-key depressed state corresponding to FIG.

On the rear portion 4d 'of the chassis 4, as in the first embodiment, the upper stopper 10 is arranged in a strip shape along the key arrangement direction (which is also the arrangement direction of the hammers 2) over the entire key width. It is set up. Further, in the present embodiment, a “mass portion MB” is provided behind the upper stopper 10 in the chassis rear portion 4d ′. Both the upper stopper 10 and the "mass part MB" are fixed to the lower surface of the rear part 4d 'by adhesion or the like. "Mass part MB" is the upper stopper 10
Is arranged in a strip shape along the key arrangement direction over the entire key width, and therefore, the upper stopper 10 and the “mass portion MB” are arranged in two rows. . As a result, the assembly of the “mass part MB” is easier than that of the “mass part MA” of the first embodiment.

The "mass part MB" has a structure in which a mass body 22 having a length of the entire key width is sandwiched between an upper cushion 21 and a lower cushion 23, and the upper cushion 21 is attached to the chassis rear portion 4d '. It is fixed. Mass 22
May be made of metal, but in the present embodiment, for example, by mixing metal powder with elastomer or rubber, it is made of an elastic material having suitable mass and flexibility,
In particular, it is desirable to use a material having a large internal loss.
The mass body 22 occupies most of the mass of the “mass part MB”.

The lower cushion 23 directly contacts the free end 2d of the hammer 2 to transfer the kinetic energy of the hammer 2 to the mass body 22 and reduce the impact noise. Therefore, it has a hardness suitable for sufficiently transmitting the kinetic energy of the hammer 2 to the mass body 22 so as not to absorb an impact too much. The upper cushion 21 includes the hammer 2 to the mass body 22.
It is composed of a soft material that efficiently absorbs the kinetic energy received by. The mass 22 is the upper cushion 2
It is movable up and down within a range in which 1 is elastically deformed.

The "mass part MB" contacts the lower cushion 23 almost at the same time as the free end 2d of the hammer 2 contacts the upper stopper 10 when the hammer 2 is rotated by a key pressing operation. , Its height position is set.

In such a structure, when the key 2 is pressed and the hammer 2 reaches the vicinity of the rotation end position, the free end 2d of the hammer 2 causes the upper stopper 10 and the lower cushion 2 to move.
It contacts 3 at almost the same time.

Then, the mass body 22 is urged upward through the lower cushion 23, the upper cushion 21 is largely elastically deformed, and the mass body 22 moves upward. Since the free end 2d of the hammer 2 contacts the “mass part MB”, most of the kinetic energy of the hammer 2 is transmitted to the “mass part MB”,
The kinetic energy of the hammer 2 is effectively reduced. The action of dispersion conversion of kinetic energy at the time of key depression is the same as that of the first embodiment, and the "mass part M" immediately after key depression is performed.
If the kinetic energy of B ”is E4 (J), most of the kinetic energy E1 of the hammer 2 is the strain energy E2 of the upper stopper 10 and the kinetic energy E4 of the“ mass part MB ”.
Is converted to and.

According to the present embodiment, it is possible to maintain a firm stop feeling for a long period of time while suppressing the rebound of the hammer body, the impact on the finger, and the impact sound when the key is pressed down. The same effect as that of the embodiment can be obtained.

According to the present embodiment, the "mass part M
B ”and the upper stopper 10 are provided in common for all the hammers 2 and are arranged side by side in a strip shape along the key arrangement direction. Therefore, as in the first embodiment, the“ mass part MA ”is provided for each key. Compared with the case where it is provided, the number of assembling steps for the “mass part MB” can be reduced. Further, since the “mass part MB” and the upper stopper 10 are held by the chassis 4 which is a common holding member, the “mass part MA” is replaced with the rear cover 19 as in the first embodiment. The depth dimension of the device can be shortened as compared with the case where the ceiling portion 19a is separately fixed.

In the present embodiment, the mass body 22 is
Although the elastic material is formed by mixing the metal powder, the elastic material is not limited to the illustrated material and structure as long as it can move freely according to the operation of each hammer 2. For example, the metal may be divided into one hammer 2 or a plurality of hammers 2, or may be divided into a width narrower than the width of one hammer 2. Specifically, if the metal chain wire is formed to have a full key width or a length extending over a plurality of key widths, efficient absorption of energy due to internal friction can be expected. Even in the case of a chain wire, not only a single wire but also a plurality of wires may be arranged side by side in the front-back direction of the device. As the cross section of the chain wire, the external shape (cross section of one wire) is preferably rectangular or the like, and it is more preferable to bury the inside of each chain with resin.
Further, as the mass body 22, one in which sand or metal powder is wrapped in a bag-shaped member to have a full key width or a length over a plurality of key widths may be applied.

The "mass part MA" is not common to all the hammers 2 but may be divided into some and may be commonly provided to a plurality of hammers 2.

In the present embodiment, the lower surface position of the lower cushion 23 is determined by the total thickness of the upper cushion 21, the mass body 22 and the lower cushion 23. Therefore, the lower surface position of the lower cushion 23 is set to the entire key width. To make it uniform across
It is necessary to set the variation in thickness as small as possible. However, in the case of the following modified example, the lower cushion 2
The lower surface position of 3 can be easily made uniform.

That is, instead of adhesively fixing the "mass part MB" to the chassis rear portion 4d ', as shown in FIG. 5, the supporting members 24 (24A, 24B, etc.) are fixed to the chassis 4 and the main body of the apparatus. In the support surface 24a (24Aa, 24Ba, etc.) of the support member 24 having a uniform height, a plurality of them are provided at appropriate intervals (for example, between the hammers 2).
B "may be held from below. In this way, the lower surface of the lower cushion 23 is kept uniform on the support surface 24a, so that the variation in the contact timing between the hammers 2 is reduced, and the feeling of pressing the keys between the keys is reduced. The stop feeling becomes uniform.

In particular, the structure employing the chain wire,
As shown in FIG. 5, in the configuration in which each key is partitioned by each support member 24, even if a plurality of adjacent keys are simultaneously pressed, the influence of the touch feeling between the adjacent keys is reduced. It is possible to make it difficult to receive.

Alternatively, instead of adhesively fixing the "mass part MB" to the chassis rear part 4d ', as shown in FIG. 6, the "mass part MB" is wrapped and held from below by the sheet member 25. Good. The sheet member 25 is
For example, the upper part may be held by the chassis 4. The sheet member 25 is a thin film-like member, and is formed of a material and thickness that has a small amount of expansion and contraction but is not very hard and has flexibility, and prevents the kinetic energy of the hammer 2 from being smoothly transmitted to the mass body 22. Configured not to. With this configuration, the seat member 25 is used to lower the lower cushion 23.
Since the lower surface position is maintained uniform, the same effect as in the case of the support member 24 can be obtained. The lower cushion 23 may be provided on the lower surface of the seat member 25.

In the first and second embodiments, the upper stopper 10, the "mass part MA" and the "mass part M" are used.
Although the hammer 2 which is rotated by the key 1 is exemplified as the rotating member that comes into contact with the "B", the present invention is not limited to this, and the key itself having an appropriate mass distribution serves as the rotating member and the upper stopper 10, " The present invention can be applied to a case where the mass unit MA ”and the“ mass unit MB ”are directly contacted. Further, it is also applied when the hammer 2 is rotated by the key 1 via another member.

[0065]

As described above, according to the present invention,
A firm stop feeling can be maintained for a long period of time while suppressing the rebound of the rotating member, the impact on the finger, and the impact sound when the key is pressed down.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a drive unit structure of a keyboard device according to a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view taken along the line AA of FIG. 1 (non-key-depressed state (state in which the key is at the start position of the key-depression stroke)).

3 is a vertical cross-sectional view taken along the line AA of FIG. 1 (key-depressed state (state in which the key is at the end position of the key-depressing stroke (press-cut position))).

FIG. 4 is a vertical sectional view of a keyboard device according to a second embodiment of the present invention.

FIG. 5 is a diagram showing a modification of the second embodiment.

FIG. 6 is a diagram showing a modification of the second embodiment.

[Explanation of symbols]

1 key, 2 hammer (rotating member), 2d free end portion, 4 chassis (holding member), 10 upper stopper (stopper portion), 15 leaf spring, 16 mass body,
17 first cushion, 18 second cushion,
25 sheet member (membrane member), ME kinetic energy dispersion mechanism, MA, MB mass part

Claims (6)

[Claims] 1. A plurality of rotating members which are each rotated by a key pressing operation, and a stopper portion which has elasticity and which abuts on the rotating member and substantially regulates a rotation end position of the rotating member. A mass portion movably held in the same direction as the rotation direction of the rotation member, and the rotation member contacts the stopper portion at substantially the same time when the rotation member contacts the mass portion. A keyboard device characterized by being configured in. 2. A plurality of rotating members which are each rotated by a key pressing operation, and a stopper portion which has elasticity and which abuts on the rotating member and substantially regulates a rotation end position of the rotating member. A mass part that is held so as to be movable in substantially the same direction as the direction of rotation of the rotating member, and at least when the rotating member comes into contact with the mass part and the stopper part by a key depression operation, Immediately after the contact, the kinetic energy of the rotating member given by the key pressing operation is converted into strain energy due to elastic deformation of the stopper portion and kinetic energy of the mass portion. A keyboard device characterized by. 3. The stopper portion and the mass portion are provided in common to a plurality of rotating members, and are arranged in a strip shape along the arrangement direction of the rotating members. The keyboard device described in 2. 4. The stopper part and the mass part are held by a common holding member.
The keyboard device according to any one of 1 to 3. 5. The keyboard device according to claim 1, wherein the mass portion is configured to be held via a film member. 6. The mass part includes a mass body occupying most of the mass of the mass part, and the mass part is made of an elastic material. The keyboard device according to any one of items.