JP2567760Y2 - 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, especially an electronic piano.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 10, a key a is provided rotatably about a fulcrum b.
A keyboard device of an electronic musical instrument in which a hammer-like member (hereinafter, simply referred to as a hammer) d is rotatably supported around the center is known.

The hammer d is for obtaining a key touch feeling similar to that of an acoustic piano, has a predetermined weight, and has a center of gravity at the right end of the figure. When the key a is pressed, the hammer d rotates via the support member e, and when the key a is released, the hammer d and the key a return to the initial positions due to the weight of the hammer d.

[0004]

According to the above-mentioned conventional keyboard device, a key touch feeling similar to that of an acoustic piano can be obtained only when the key is pressed with a certain force or more, but it is very weakly pressed. When the key is pressed, as shown in FIG. 11, when the key is depressed, the load starts to increase from point 0, and the load becomes maximum at the point P. When the key is depressed further, the load is reduced at once (let-off), such as an acoustic piano. I cannot get a good touch feeling. The present invention provides a key touch feeling similar to that of an acoustic piano not only when the player strikes strongly but also when the player strikes lightly,
It is an object of the present invention to provide a keyboard device for an electronic musical instrument which has good continuous tapping characteristics, does not increase the number of parts, is easy to assemble, and is inexpensive.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a jack which moves and rotates by a force transmitted from a key, and a jack which controls the pressure against the movement and rotation of the jack. And a pressing member to be added to the electronic musical instrument.The jack is rotatably locked to a fulcrum provided on the key, urged to an initial position by an elastic member, and the key is actuated by the jack. It has a return load application part which abuts when the pressing member returns to the initial position and applies a return load to the key, and the return load application part is molded integrally with the key.

[0006]

When the key is depressed, the jack also moves downward, and the downward movement of the jack rotates the pressing member, for example, the hammer. When you swipe the key, the hammer has an inertia effect,
Even when hit lightly, the hammer exerts a force opposing to key depression due to its own weight. When the key is depressed to some extent, the jack comes into contact with the fixing member and starts to rotate.At this time, the jack receives drag from the fixing member, and the player who has hit lightly must temporarily depress the key with a large force. Have to be. When the key is further depressed, the jack is released from the hammer, and the force of the hammer's own weight is not transmitted to the key. For this reason, the player who has hit lightly feels weak at once. After that, the key reaches the lower limit position, while the hammer rotates to the rotation limit position by inertia and then starts to rotate in the opposite direction due to its own weight, abuts against the return load applying portion of the key at the lower limit position, and stops. When the key is returned, the key is always applied as a return load, and the key can be pressed without losing the feeling of mass even in repeated tapping during key return while the key is being returned. The key returns to the initial position by applying the return load of the spring and hammer,
The hammer also returns to the rotation restricted position, and the jack also returns to the initial position by the force of the elastic member to prepare for the next key press. Since the return load applying part is integrally formed with the key, the number of parts does not increase, the assembling is simple, and the dimensional accuracy is improved.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 4 show one embodiment of the present invention. In the figure, reference numeral 1 denotes a synthetic resin key (white key) rotatably supported by a keyboard frame 2 at a base end thereof, which is formed in a substantially box shape and has an open lower surface. At least one of the return load applying portions 3 (described later) is integrally formed so as to protrude downward. A switch 4 and a fulcrum member 5 are fixed to the keyboard frame 2, and a fulcrum 6 of the fulcrum member 5 has a weight 7 at one end.
Is rotatably supported.
A jack 9 is rotatably supported in the internal space of the key 1 and the other end of a strip-shaped leaf spring 11 having one end fixed to a leaf spring receiving portion 10 provided on the inner upper wall of the key 1. In the figure, the hammers 8 are urged in a counterclockwise direction so that the hammer contact portion 12 contacts the jack contact portion 13 of the hammer 8. The hammer contact portion 12 of the jack 9 is formed slightly longer than the return load applying portion 3 described above. The switch 4 is a switch supported by a switch board 14, and is operated by being pressed by an actuator 15 provided on an inner upper wall of the key 1 when the key 1 rotates by a predetermined angle.

To explain the operation of this embodiment, when the key 1 is depressed, the key 1 starts to rotate counterclockwise, and the jack 9 moves downward accordingly. As the jack 9 moves, the hammer contact portion 12 presses the jack contact portion 13, and the hammer 8 starts rotating counterclockwise. At this time, the player performs the load adjustment coil spring 16 and the hammer 8.
Load. When the key 1 is further depressed, the projection 17 of the jack 9 comes into contact with the keyboard frame 2 as shown in FIG. 2, and the jack 9 starts rotating. At this time, the performer
It receives the drag from the keyboard frame 2 and the load of the leaf spring 11 provided on the jack 9. When the key 1 is further depressed, the jack 9 comes off the hammer 8 as shown in FIG. However, the hammer 8 continues to rotate due to inertia, and the self-weight of the hammer 8 is no longer transmitted to the key 1, so that the player feels at this time that the hammer 8 comes out momentarily. Thereafter, the key 1 contacts the key lower limit stopper felt 18, and the rotation of the key 1 ends. Hammer 8
After contacting the hammer upper limit stopper felt 19,
It starts to rotate clockwise by its own weight, and as shown in FIG.
The jack contact portion 13 contacts the return load applying portion 3 of the key 1 to prevent the hammer 8 from rotating and returning, and the contact force of the hammer 8 on the jack contact portion 13 against the return load applying portion 3 passes through the key 1. Since it is transmitted to the player, it has the effect of making the hammer feel as if the hammer returns after striking a string on a normal acoustic piano. At this time, the hammer contact portion 12 of the jack 9 cannot return on the jack contact portion 13 of the hammer 8. At the time of key release, the key 1 returns to the initial position where it comes into contact with the key upper limit stopper felt 20 shown in FIG.
, And its rotation ends. Thus, the hammer contact portion 12 of the jack 9 quickly returns to the jack contact portion 13 of the hammer 8 by the elastic force of the leaf spring 11. The jack contact part 1 of the hammer 6 is attached to the return load applying part 3 of the key 1 after the key is pressed.
Since the load of the hammer 8 is transmitted to the key 1 via the return load applying unit 3 by the contact of the key 3, the key 1 is kept in a state where the load of the hammer 6 is always applied to the return load applying unit 3 at the time of key release. Is restored, a sense of mass is given to the finger that contacts the key 1. Therefore, the sense of mass is imparted to the key being pressed again during the return, and the sense of mass is not impaired even when the player repeatedly hits.

5 to 8 show another embodiment of the present invention. In the figure, reference numeral 1 denotes a synthetic resin key (white key) rotatably supported by a keyboard frame 2 at a base end thereof, which is formed in a substantially box shape and has an open lower surface. A key upper limit stopper 22 protrudes downward from at least one front end of the key 1 and is integrally formed. An actuator 15 is provided on an inner upper wall of the key 1. The key upper limit stopper 22 also functions as a return load applying unit and a catcher. The switch 4 and the fulcrum member 5 that are pressed and actuated by the actuator 15 are fixed to the keyboard frame 2.
At a fulcrum 6 of the fulcrum member 5, a hammer 8 having a weight 7 attached to one end is rotatably supported. A jack 9 having a thickness substantially equal to the width between both side walls is rotatably supported in the internal space of the key 1, and one end of the jack 9 is locked in a concave portion 23 formed above the fulcrum member 5. The other end of the strip-shaped leaf spring 11 is urged in the counterclockwise direction in the figure, so that the hammer contact portion 12 projecting downward from the slit 24 of the keyboard frame 2 contacts the jack contact portion 13 of the hammer 8. Has become. The operation of this embodiment will be described.
When the key 1 is depressed, the key 1 starts to rotate counterclockwise, and accordingly, the jack 9 moves downward. As the jack 9 moves, the hammer contact portion 12 presses the jack contact portion 13, and the hammer 8 starts rotating counterclockwise. At this time, the player receives the load of the hammer 8. When the key 1 is further depressed, the projection 17 of the jack 9 comes into contact with the keyboard frame 2 as shown in FIG. 6, and the jack 9 starts rotating. At this time, the player receives the drag from the keyboard frame 2 and the load of the leaf spring 11 provided on the jack 9. When the key 1 is further depressed, the jack 9 becomes, as shown in FIG.
Remove from hammer 8. However, since the hammer 8 continues to rotate due to inertia, the own weight of the hammer 8 is not transmitted to the key 1, so that at this time, the player feels that he / she will come out momentarily. Thereafter, the key 1 abuts against the key lower limit stopper felt 18, and the rotation of the key 1 ends.

After the hammer 8 comes into contact with a hammer upper limit stopper felt 19 provided on the keyboard frame 2, it starts to rotate clockwise by its own weight, and as shown in FIG. 8, the hammer 8 to which the felt 25 is adhered. The front end inclined portion 26 is the key 1
Abuts against an inclined portion 27 formed below a rear portion of the key upper limit stopper 22 which also serves as a return load applying portion and a catcher,
The return of rotation of the hammer 8 is prevented. Due to this contact, the vibration of the hammer 8 is suppressed, and the contact force is transmitted to the player through the key 1, so that the hammer 8 has an effect of making the hammer return as if the hammer has been hit on a normal acoustic piano. At the time of key release, the key 1 is turned to the initial position by the hammer 8 which turns clockwise by its own weight, and the leaf spring 11
The hammer contact portion 12 of the jack 9 is
The hammer 8 quickly returns to the jack contact portion 13 and the upper portion of the jack 9 contacts the inner upper wall of the key 1.
Returns to the initial position where it comes into contact with the key upper limit stopper 22 shown in FIG. Hammer 8 is also lower hammer stopper felt 2
1 and ends its rotation.

At the time of key release, when the key 1 returns with the load of the hammer 8 being constantly applied to the key upper limit stopper 22 via the inclined portion 27, a sense of mass is given to the finger that comes into contact with the key 1. You. Therefore, the sense of mass is given to the key depressed again during the return of the key 1, and the sense of mass is not impaired even in repeated hits. FIG. 9 shows an embodiment of the present invention using a member different from the pressing member shown in FIGS. In the figure, reference numeral 8a denotes an air damper or an elastic member as a pressing member, and a movable member 29 is fitted to the cylindrical body 28 thereof.
The upper end corresponds to the jack contact portion 13 of the hammer shown in FIGS. 1 to 4, the hammer contact portion 12 of the jack 19 abuts against the jack contact portion 13, and the return load applying portion 3 integrally formed with the key 1 faces the jack contact portion 13. ing. Its operation is almost the same as that of the embodiment shown in FIGS.

[0012]

[Effects of the Invention] Since the present invention is configured as described above, a key touch feeling very similar to that of an acoustic piano can be obtained not only when a key is strongly struck but also when the key is struck lightly, and the key is restored when the key is released. Sometimes, the pressing member abuts against the return load applying portion of the key, thereby providing a feeling of mass of the key, and has an effect that the feeling of mass of the key is not impaired even during repeated striking. In addition, since the return load applying portion and the key are integrally formed, the assembly is simple, the number of parts does not increase, and the cost is low.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of an embodiment of the present invention in a key released state.

FIG. 2 is a partially cut-away side view of the above-described embodiment in which the jack has started to rotate after a key is pressed;

FIG. 3 is a partially cut-away side view of the above embodiment in which the jack is released from the hammer after the key is pressed.

FIG. 4 is a partially cut-away side view of the embodiment immediately after the key is released.

FIG. 5 is a partially cut-away side view of another embodiment of the present invention in a key released state.

FIG. 6 is a partially cut-away side view of the other embodiment in a state where the jack has started to rotate after a key is pressed;

FIG. 7 is a partially cut-away side view of the other embodiment in which the jack is released from the hammer after the key is pressed.

FIG. 8 is a partially cut-away side view of the other embodiment immediately after the key is released.

FIG. 9 is a partially cutaway side view showing a modification of the embodiment of the present invention shown in FIGS. 1 to 4;

FIG. 10 is a sectional view of a keyboard device of a conventional electronic musical instrument.

FIG. 11 is a diagram showing a key stroke versus load characteristic of an acoustic piano.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 key (white key) 2 keyboard frame 3, 3 a return load applying portion 8 hammer 8 a air damper or elastic member 9 jack 11 leaf spring 22 key upper limit stopper 26, 27 also serving as return load applying portion and catcher

Claims (1)

(57) [Scope of request for utility model registration] 1. A keyboard device for an electronic musical instrument, comprising: a jack that moves and rotates by a force transmitted from a key; and a pressing member that applies a pressure against the movement and rotation of the jack to the jack. Is rotatably locked to a fulcrum provided on the key and is urged to an initial position by an elastic member, and the key comes into contact with the key when the pressing member operated by the jack returns to the initial position and returns to the key. A keyboard device for an electronic musical instrument, comprising: a return load applying portion for applying a load, wherein the return load applying portion is integrally formed with a key.