JP3057969B2 - Electronic musical instrument keyboard device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard device for an electronic musical instrument such as an electronic piano, and more particularly to a keyboard device for an electronic musical instrument having a mass that rotates in response to a key depression operation.

[0002]

2. Description of the Related Art Conventionally, as a keyboard device for an electronic musical instrument of this type, a mass body that rotates with a keystroke is directly brought into contact with a pressure sensor provided in a device fixing portion to detect an impact force of the mass sensor. There has been one that controls a musical sound to be generated in accordance with an impact force.

[0003]

However, in such a conventional keyboard device for an electronic musical instrument, since the mass body directly contacts the pressure sensor by keying, a high frequency generated by the impact of the mass body contact is obtained. The vibration caused by the above-mentioned harmonic vibration is mixed in the output of the pressure sensor. Such a keyboard device for an electronic musical instrument requires a circuit for removing noise, and it has not been possible to prevent the impact force detecting means from becoming complicated.

Also, when one key is pressed, the vibration is transmitted to the pressure sensor of the adjacent key via the base member of the pressure sensor, and the key that has not been pressed is weakly pressed. There is also a problem that misreaction is likely to occur as a result. SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to suppress the occurrence of harmonic vibrations at the time of contact with a mass body and to prevent malfunction of the impact force detecting means.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a plurality of keys, a mass body which rotates by a predetermined angle with each key depression operation, the key and the mass. A keyboard device for an electronic musical instrument having a key support member having first and second fulcrum portions for swingably supporting a body, wherein the mass is brought into contact with a position that can be brought into contact by the rotation of the mass body. an impact force detecting means having a detecting member capable of detecting the impact force at the time of body contact and a pressure cushions member to either be disposed on one another between the detection member and the mass body is provided, this The cushion member is
A plurality of softened cups that are softer and harder
Deployment layer Ri name by stacking, there is provided a keyboard apparatus of an electronic musical instrument which is adapted to generate a musical tone control signal in response to the detection output of the impact force detecting means.

[0006] In such a keyboard device of an electronic musical instrument,
Oite, the electronic musical instrument to the base member to dispose the detecting member, provided with the stress concentrating member for concentrating the impact force of the mass body at a point
Keyboard device is also provided.

Further, in a keyboard device for a similar electronic musical instrument, an impact force detecting device is provided at a position where it can be brought into contact with the mass body by rotating the mass body and which can detect an impact force when the mass body abuts. Means, a cushion member disposed on the mass body side of a comb-shaped tongue formed corresponding to each key on a base member provided with the detection member, and the mass body abutting when rotating at a predetermined angle. And an electronic musical instrument configured to generate a tone control signal in accordance with a detection output of the impact force detecting means.
Keyboard device is also provided.

[0008]

With the keyboard device for an electronic musical instrument according to the present invention having the above-described construction, the impact force generated when the mass body rotates due to the key depression operation is transmitted to the detection member via the cushion member. Harmonic vibration transmitted to the detecting member at the time of contact is greatly suppressed. At this time, since the vary the cushion member sequentially soft et hardness from the mass side, to reduce the loss of impact energy of the mass to be transmitted to the detecting member side it can be increased and the detection level.

Further, if the stress concentration member is provided on the base member on which the detection member is provided, even if the contact position of the mass body is slightly varied, an accurate impact force can be always detected, and the detection output can be obtained. Can be further increased. Further, if a comb-shaped tongue corresponding to each key is formed on the base member, and a detection member is disposed on each of these tongues, the impact force by the key pressing due to the interaction with the cushion member is obtained. Since it is difficult to be transmitted to adjacent keys, malfunction of the impact force detecting means is extremely reduced.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, and FIG. 2 is a plan view of a sensor mounting base member.

In FIG. 1, a key (white key) 1 is integrally formed of resin in a U-shaped cross section with an open lower surface, and a cylindrical inner surface concave portion 1a (key fulcrum on the key side) is formed at the rear end. Provided,
The concave portion 1a is vertically and swingably engaged with a support pin 3 having a circular cross section fixed to a sheet metal keyboard frame (hereinafter simply referred to as a "frame") 2 as a key support member. (A key support). In addition,
This support pin 3 is formed by outsert molding on the rear edge of a rectangular slit 2 a formed in the frame 2.

At the front of the key 1, stopper pieces 1 b and 1 c which are integrally hung from both side walls are vertically provided, and a lower limit stopper 5 attached to a horizontal surface of a key guide 4 which is provided upright at a front end of the frame 2.
a and the upper limit stopper 5b can be brought into contact with each other to regulate the swing range of the key 1.

A support pin 6 is integrated with the front edge of the slit 2a of the frame 2 by outsert molding, and a concave portion 7a of a hammer 7 which is a mass body is engaged with the support pin 6 so as to swing up and down. 6 constitutes a second fulcrum (mass body fulcrum). The hammer 7 has a core material 7b made of metal so as to have a predetermined weight, and the edge of the core material 7b is framed with a resin by outsert processing, and the center of gravity is at the longitudinal end 7c. To do.

A bifurcated switch pressing portion 7d, 7e protrudes downward near the support pin 6 constituting a fulcrum portion of the hammer 7, and a protruding portion 7f protrudes above the switch pressing portion 7d. The concave portions 1e formed on the both side walls of the above-mentioned members press the convex portions 7f to rotate the hammer 7 counterclockwise. Then, by the rotation of the hammer 7, the switch pressing portions 7 d and 7 e are lowered, and 1 make, 2 make on the substrate 8 fixed to the frame 2.
The respective switches 8a and 8b of the makeup are turned on so that a tone generation signal is generated. The upper limit stopper 9 attached to the lower surface of the frame 2 regulates the clockwise swing limit of the hammer 7.

Between the rear end 1d of the key 1 and the locking groove 7g formed in the hammer 7, a strip-shaped leaf spring 10 having a wide portion for positioning formed at both ends is engaged to fix the key 1. The key 1 is pressed clockwise and the recess 1a of the key 1 is pressed against the support pin 3,
At the same time, the hammer 7 is urged clockwise and the recess 7a of the hammer 7 is pressed against the support pin 6.

The frame 2 is connected to the stays 11a and 11a.
The base member 13 made of an elastic material is fixed on the horizontal shelf board 12 via a stay 11c via the stay 11c. As shown in FIG. 2, the base member 13 includes, for example, twelve comb-shaped tongue pieces 13a arranged at regular intervals corresponding to each key, and a needle is provided on the front end side of the surface of each tongue piece 13a. A rigid stress concentration member 14 in the shape of a hook or a hook is provided (FIG. 1).
), A cushion member 15 proudly abutting on the hammer 7 is provided between the stress concentration member 14 and the rear portion of the base member 13, and a strain sensor 16 serving as an impact force detection member is provided on the back surface of each tongue 13a. And the detection output is input to a tone control signal generation circuit via a wiring pattern (not shown).

It is to be noted that, instead of forming the cushion member 15 in a comb shape, as shown in FIG.
5 and the tongue piece 13 'provided with the strain sensor 16 may be made independent for each key so that the vibration of the adjacent hammer is hardly transmitted.

The cushion member 15 is a hard plate 1
5d, the first, second, and third cushion layers 15a, 15
b, 15c are laminated, the first cushion layer 15a in contact with the hammer 7 is made the softest, the third cushion layer 15c on the base member 13 side is made the hardest, and the intermediate second cushion The layer 15b is placed in the middle, and the hard stress concentration member 14 is attached to the plate 15d.
To prevent the cushion member 15 from immersing into the third cushion layer 15c through the contact member, and prevent the cushion member 15 from generating harmonic vibration due to the contact of the hammer 7. The extension surface of the surface of the first cushion layer 15a passes through the rotation center of the hammer 7 (the center of the support pin 6).
Abut on the cushion member 15 almost vertically.

Although the white key and the members related to the white key have been described above, the relationship between the black key and the related members is almost the same as that of the white key except that the shape of the black key is different from that of the white key. Detailed description and illustration of the black key and its related members are omitted.

Next, the operation of the embodiment configured as described above will be described. When the key 1 is pressed against the urging force of the leaf spring 10 from the state shown by the imaginary line in FIG. 1, the key 1 rotates counterclockwise about the support pin 3 and its concave portion 1e causes the convex portion 7f. To rotate the hammer 7 about the support pin 6 at approximately three times the speed of the key 1. When the key 1 and the hammer 7 reach the positions indicated by the solid lines in the figure, the hammer 7 comes into contact with the first cushion member 15a from a substantially vertical direction, and continues to rotate while elastically deforming the cushion member 15 as shown in FIG. The position indicated by the imaginary line is reached.

Thus, the impact force caused by the contact of the hammer 7 is transmitted to the stress concentration member 14 via the cushion member 15, and the corresponding tongue piece 13a of the base member 13 is elastically deformed. The magnitude of this elastic deformation is proportional to the square of the key-pressing speed, and when the magnitude becomes larger than a preset value, the distortion sensor 16 detects it and instructs the sound source means to start the tone generation. Is obtained.

In the above process, the cushion member 15 for transmitting the impact force of the hammer 7 to the stress concentration member 14 is formed by laminating a plurality of cushion layers.
The harmonic vibration caused by the impact of the sensor is effectively suppressed and the strain sensor 16
This eliminates noise mixed in with the key and allows accurate detection of only pure keying power. At the same time, since the lowermost layer of the laminated cushion layers is made of a relatively hard cushion layer, the impact force of the hammer 7 is transmitted to the base member 13 without being greatly reduced, and the output value of the strain sensor 16 can be increased. Will be possible.

The impact force of the hammer 7 is applied to the base member 13.
Is transmitted to the base member 13 at one point via the stress concentration member 14 disposed at a predetermined position on the tip side of the hammer 7, so that even if there is some variation in the hammer 7 at each contact position, the hammer 7 is always stable. Thus, the output of the strain sensor 16 can be obtained, and the output value can be further increased.

At the same time, the hammer 7 is depressed by a key depression operation.
The switch pressing portions 7d and 7e turn on the switches 8a and 8b of 1 make and 2 make sequentially. The time difference is proportional to the key-pressing speed, and outputs data for instructing the start of tone generation when the two-make switch 8b is turned on, and at the same time, touch response data corresponding to the time difference, that is, key-pressing. Data for instructing tone parameters such as volume and tone at the start of the operation is output in cooperation with the above-described impact force detecting means.

In the above embodiment, the cushion member is attached to the impact detecting means. However, the cushion member may be attached to the hammer or to both of them. In addition, the base member of the strain sensor may be made of metal, and the base member may be grounded in common to all the strain sensors to simplify wiring.
Further, in the above embodiment, the impact of the hammer is transmitted to the strain sensor via the stress concentration member provided on the base member. However, this applied concentration member is not always necessary, and the stress detection member is provided. Depending on the location, a pressure sensor may be used instead of a strain sensor.

[0026]

As described above, the keyboard device for an electronic musical instrument according to the present invention has a structure in which the mass body which rotates with the key depression and the detecting member which detects the impact force when the mass body abuts. Since the cushion member is interposed, the harmonic vibration which has conventionally occurred at the time of contact with the mass body and the noise of the detecting member caused by the vibration are drastically reduced, so that accurate impact force detection and accompanying musical tone control can be performed. Then, the cushion member is hard and soft.
Because it consists of multiple cushion layers,
The output of the detection member while effectively suppressing the harmonic vibration at the time of contact
The value can be increased.

[0027] Further , the base member on which the detecting member is provided is adapted.
If a force concentration member is provided, the output value of the detection member
Can be further enlarged and its detection accuracy improved
It becomes possible to do. Furthermore, the base member is comb-shaped
When it is formed, the key is pressed by the interaction with the cushion member.
The impact force generated by the
And the malfunction of the impact force detection means
It can be extremely small.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention.

FIG. 2 is a plan view showing the sensor mounting base member.

FIG. 3 is a plan view showing another example of a sensor mounting base member.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Key, 2 ... Keyboard frame (key support member), 3 ... Support pin (1st fulcrum part), 6 ... Support pin (2nd fulcrum part),
7: hammer (mass body), 13: base member, 13a, 1
3a ': tongue piece, 14: stress concentration member, 15: cushion member, 15a: first cushion layer, 15b: second cushion layer, 15c: third cushion layer, 15d: hard plate, 16: strain sensor (Detection member)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 3-35598 (JP, U) JP-A 5-73685 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) G10H 1/34 G10B 3/12 G10C 3/18 G10F 1/02

Claims (4)

(57) [Claims] 1. A plurality of keys, a mass body that rotates by a predetermined angle in accordance with a key depression operation of each key, and first and second fulcrums that support the key and the mass body in a swingable manner. A keyboard device for an electronic musical instrument having a key support member provided with a portion, wherein a detection member is provided at a position where the mass body can be brought into contact by rotation of the mass body and can detect an impact force at the time of contact with the mass body. An impact force detecting means; and a cushion member disposed on one of the detection member and the mass body and capable of being pressed against the other, and the cushion member softly detects the mass body contact side.
Stack multiple cushion layers that are sequentially harder toward the member side.
A keyboard device for an electronic musical instrument , wherein a musical tone control signal is generated according to a detection output of said impact force detecting means. (2)With multiple keys and key press operation of each key
And the key and the mass
First and second supporting points for swingably supporting the mass body, respectively
Keyboard device for an electronic musical instrument having a key support member having a
And The material is provided at a position where it can be contacted by the rotation of the mass body.
Impact equipped with a detection member capable of detecting the impact force at the time of contact
Force detecting means, any one of the detecting member and the mass body
A cushion member is provided on one side and press-contactable on the other side.
, Cushion memberIs the mass bodySoft contact sideLaDetect
To the member sideOrStacking multiple cushion layers
LayerAnd a base portion on which the detection member is disposed.
Stress concentration on the material to concentrate the impact force of the mass body at one point
A member is provided, and easy to operate according to the detection output of the impact force detecting means.
Generated sound control signalElectron characterized by
Keyboard device for musical instruments. 3. A keyboard apparatus of an electronic musical instrument according to claim 1 Symbol placement, and characterized in that the base member to dispose the detection member, provided with the stress concentrating member for concentrating the impact force of the mass to a point Electronic musical instrument keyboard device. 4. A plurality of keys, a mass body that rotates by a predetermined angle in accordance with a key depression operation of each key, and first and second fulcrums that support the key and the mass body in a swingable manner. A keyboard device for an electronic musical instrument having a key support member provided with a portion, wherein a detection member is provided at a position where the mass body can be brought into contact by rotation of the mass body and can detect an impact force at the time of contact with the mass body. Impact force detecting means and a comb-shaped tongue formed in correspondence with each key on the base member provided with the detecting member are disposed on the mass body side, and the mass body abuts when rotated by a predetermined angle. A keyboard device for an electronic musical instrument, further comprising a cushion member, wherein a tone control signal is generated in accordance with a detection output of the impact force detecting means.