JP2508028B2 - Electronic musical instrument keyboard device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard device for an electronic musical instrument, and more particularly to an improvement of a key mechanism of a keyboard device used for an electronic piano, an electronic organ, or the like.

(Prior Art) As a keyboard device for a conventional electronic musical instrument, for example, one shown in FIG. 7 (Japanese Patent Laid-Open No. 57-147691) is known.

FIG. 7 is a model diagram showing the operating principle of the key mechanism of the conventional keyboard device.

As shown in this figure, the key 1 is swingably provided around a fulcrum 3. Further, below the key 1, a hammer (mass body) 5 is also swingably supported around a fulcrum 7. The hammer 5 is provided to obtain a key touch feeling similar to that of an acoustic piano even in an electronic musical instrument, and has a predetermined weight. The center of gravity 9 of the hammer 5 is arranged at the right end in the figure, and the force point A of the hammer 5 for swinging the hammer 5 in conjunction with the swing of the key 1 is the left end in the figure on the side opposite to the center of gravity 9. It is located in.

Therefore, when the key is pushed in the direction of the arrow in the figure, the hammer 5 also swings counterclockwise in the figure via the force point A, while when the key 1 is released, the weight of the hammer 5 causes the hammer 5 and the key 1 to move toward the It swings in the clockwise direction and returns to the initial position.
That is, in the above-described keyboard device, the key 1 is returned to the non-key-depressed state by the urging force by the key return spring (not shown), and the hammer 5 is in the non-operated state as shown by the return means of its own weight. Has returned to. Therefore, when the key is depressed, the key 1 is swung against the weight of the hammer 5 to cause a key touch feeling (this touch feeling is considered to have a predetermined correlation with the center of gravity 9 kinetic energy of the hammer 5). Be obtained).

(Problems to be Solved by the Invention) (1) However, in the above keyboard device, unless the key return spring and the mass ratio of the hammer and the moment ratio of the hammer are properly selected, the key pressing is too heavy, or the key and the hammer are too heavy. However, there is a first problem in that the touches become independent movements and the touch feeling when pressing and releasing keys is impaired.

(2) Further, in this keyboard device, the center of gravity 9 of the hammer 5 swings in the direction of approaching the key 1, so that the key 1 at the time of key pressing is depressed.
In order to avoid the collision between the key 5 and the hammer 5, the fulcrum 7 must be removed not only from the swing range of the key 1 but also from the swing range of the hammer 6, so that the distance between the key 1 and the hammer 5 becomes large. The second problem is that the keyboard device itself becomes large.

(Means for Solving the Problems) In the keyboard device for electronic musical instruments according to the first aspect of the present invention (the first invention), the key is swingably supported by the key support member. A mass body that is swingably arranged so as to interlock with the key when a key is pressed; one end provided near the fulcrum part of the key and the other end provided near the fulcrum part of the key. , A single elastic member for urging the key and the mass body in a direction of constantly being pressed against the key supporting member.

Further, in the keyboard device for electronic musical instruments according to the second aspect of the present application (the second invention), the key is swingably supported by the key support member and has a substantially U-shaped cross section. And a mass body that is swingably disposed so as to interlock with the key when a key is pressed, and a unit that locks one end of the key and the other end of the mass body so as to constantly urge the key in the releasing direction. One elastic member, wherein at least a part of the elastic member is arranged in a space inside the key.

Further, in the keyboard device (third invention) for an electronic musical instrument according to claim 3 of the present application, the key that is swingably supported by the key support member is the same as the key when the key is pressed. A mass body that is swingably arranged so as to rotate in conjunction with the direction, one end of which is locked to the key and the other end of which is locked to the mass body. And a single elastic member for urging so as to act in a swinging direction opposite to the moving direction.

(Operation and effect) In the keyboard device (first invention) of the electronic musical instrument according to the first aspect of the present application, one end is near the fulcrum of the key and the other end is near the fulcrum of the mass body. Since the single elastic member under the locked key urges the key and the mass body in the direction in which they are constantly pressed against the key supporting member, the number of parts can be reduced and the structure is simple. Can be

Further, in the keyboard device for an electronic musical instrument (second invention) according to claim 2 of the present application, a single elastic member is used, and at least a part of the elastic member is arranged in the internal space of the key. Since it is arranged, the vertical gap between the key and the mass body can be made small, and the keyboard device itself can be made thin, which makes it possible to make it compact.

Further, in the keyboard device (third invention) for an electronic musical instrument according to claim 3 of the present application, a single elastic member is used, and a key and a mass body are used when the key is pressed and released. Since the keys are configured to rotate in the same direction, the keyboard device itself can be made thin as in the second aspect of the invention, so that the size can be reduced.

(Example) Hereinafter, the Example of this invention is described based on drawing.

1 to 6 show an embodiment of a keyboard device for an electronic musical instrument according to the present invention.

In FIG. 1, 31 is a frame of the keyboard device, and 33
Is a key (white key) supported by the frame 31 so as to be swingable in the vertical direction about its base end. The frame 31 is made of, for example, metal so as to have a predetermined rigidity, while the key 33 is made of, for example, synthetic resin. That is, the weight of the key 33 is light. And
The key 33 is engaged at its base end (the end on the right side in the figure) with an arcuate engagement recess 36 (FIG. 4) of a pin 35 having a circular cross section fixed to the frame 31, and the pin 35 is centered. It is provided so that it can swing freely. The pin 35 is formed by subjecting the edge portion of the slit formed in the frame 31 to so-called outsert processing, and has a predetermined cutout groove 37 on the lower surface thereof. The upper surface of the tip of the key 33 (the end on the left side in the drawing) serves as a key pressing portion.

As shown in FIGS. 2 and 3, the key 33 has a substantially box shape, and its lower surface is open. Further, on both side walls of the key 33, concave portions 39 which are recessed upward are formed.

Below the key 33, a hammer 41 bent in a substantially crank shape is arranged along the key 33.
A part of 41 is loosely inserted inside the box-shaped key 33. As shown in FIGS. 2 and 5, the hammer 41 has a frame 31
43 which is a fulcrum portion of the pin (this pin 43 is formed by outsert processing having a circular cross section like the pin 35 described above).
It is swingably supported around. That is, the hammer 41 is provided so as to be vertically swingable within the same vertical plane as the key 33 with the pin 43 as a fulcrum (with the base end as a fulcrum).

Further, the hammer 41 has a core material made of a predetermined metal so as to have a predetermined weight, and the edge portion of the core material is edged with resin by outsert processing.
Further, the center of gravity of the hammer 41 is arranged on the distal end portion (the left end portion in the drawing) side in the longitudinal direction.

A bifurcated switch drive portion 45 is formed near the fulcrum portion 43 of the hammer 41. That is, when the switch driving unit 45 descends due to the swing of the hammer 41, the frame 31
The switch driving section 45 is brought into contact with a switch (not shown) arranged in (1) to close (ON) the switch.

An actuator portion 47, which is brought into contact with the key 33 and pushes down the hammer 41, is provided above the switch driving portion 45 of the hammer 41 in a horizontal direction (see FIG. 1). That is, the lower surface of the recess 39 of the key 33 is in contact with the actuator portion 47 of the hammer 41.

Further, a part of the key 33 and the hammer 41 is a slit formed in the frame 31 as shown in FIGS. 1 and 3.
Played within 49.

As shown in FIGS. 3 and 5, stoppers (felts) 51 and 53 for restricting the upper limit position and the lower limit position of the hammer 41 are fixedly attached to the frame 31. Further, as shown in the same figure, stoppers (felts) 57 and 55 for similarly restricting the upper limit position and the lower limit position of the key 33 are fixed to predetermined positions of the frame 31, respectively.

Here, as shown in FIGS. 2, 3, 5, and 6, 59 is a strip-shaped leaf spring made of metal and having a predetermined elastic coefficient, and the other end of the leaf spring 59 ( (On the left side of the drawing)
Is in contact with a locking groove 61 formed at one end side of the fulcrum 43 at the base end (one end) of the hammer 41. Also, one end (right side in the figure) of this leaf spring 59 plays in the groove 37 formed in the pin 35 which is the fulcrum part of the swing of the key 33 when the key 33 and the hammer 41 are arranged on the frame 31. With the key 33
When the shoulder portion 58 of the leaf spring 59 contacts the leaf spring locking portion 32 of the leaf spring 59, the leaf spring 59 itself is bent and deformed (buckled) in the thickness direction and attached to the hammer 41 and the key 33. .

Therefore, as shown in FIG. 2, the hammer 41 has a locking groove.
P1 seen in the direction connecting the position of 61 and the leaf spring locking portion 32
・ At the moment of r1, the key 33 is provided with the habit of returning in the clockwise direction at the moment of P2 ・ r2.

The above-mentioned moment is such that all of the elements P1, P2, r1, r2 change subtly with the rotation of the key 33 and the hammer 41, but the point is that P1 ・ r1 + P2 ・ r2
If> 0 and the vector direction is clockwise, the key 33 and the hammer 41 as a whole impart clockwise habit of returning.

In the keyboard device according to the above configuration, when the other end (tip) of the key 33 is pressed downward, the key 33 has one end, that is, the pin 35 with which the one end engages as a fulcrum. Rock.

Here, since the lower surface of the recess 39 of the key 33 is in contact with the actuator portion 47 of the hammer 41, the hammer 41 also descends as the key 33 swings. That is, the hammer 41 swings around the fulcrum 43, and the switch driving unit 45 presses the switch. In other words, the switch is turned on, and the musical tone of the pitch corresponding to this key 33 is generated by a predetermined musical tone forming circuit (not shown).
, For example, through a speaker.

At this time, the leaf spring 59 is further buckled and deformed by the swinging motion of the hammer 41, and the leaf spring 59 bends in the thickness direction thereof to impart a predetermined restoring force to the hammer 41 and the key 33.
The resistance to this swing causes a key touch feeling.

Then, when the key 33 is released, both the key 33 and the hammer 41 are given a restoring habit by one leaf spring 59, so that they are slid in the opposite directions by the urging force of the leaf spring 59. Then, the key 33 and the hammer 41 come into contact with the stoppers (felts) 57 and 51, respectively, and return to their upper limit positions.

[Brief description of drawings]

FIG. 1 is a perspective view showing one embodiment of a keyboard device for an electronic musical instrument according to the present invention, FIG. 2 is a longitudinal sectional view showing a relationship between a key and a hammer according to one embodiment, and FIG. FIG. 4 is a longitudinal sectional view showing the relationship between the key and the frame according to the embodiment, FIG. 4 is a perspective view showing the back side of the key according to the embodiment, and FIG. 5 is a relationship between the hammer and the frame according to the embodiment. 6 is a plan view showing a leaf spring according to an embodiment, FIG. 7 is a model view showing an operating principle of a conventional keyboard device, and FIG. 8 is a keyboard according to a prior application. It is the model figure which shows the operating principle of a device. 31 …… frame, 33 …… key, 41 …… hammer, 59 …… leaf spring (elastic member).

Claims (3)

(57) [Claims] 1. A key which is swingably supported by a key support member, a mass body which is swingably arranged so as to interlock with the key when a key is pressed, and a key which is provided below the key and has one end. And a single elastic member that has the other end locked near the fulcrum of the mass body and urges the key and the mass body in the direction of constantly pressing the key and the mass support member. Electronic musical instrument keyboard device. 2. A key, which is swingably supported by a key support member and has a substantially U-shaped cross section, and a mass body which is swingably disposed on a key board so as to interlock with the key. A single elastic member, one end of which is locked to the key and the other end of which is locked to the mass body, is provided with a single elastic member that constantly urges the key in the key releasing direction. At least a part of the elastic member is arranged in the space inside the key. A keyboard device for an electronic musical instrument characterized by being installed. 3. A key that is swingably supported by a key support member, a mass body that is swingably disposed so as to rotate in conjunction with the key in the same direction when a key is pressed, and one end thereof. The other end of the key is locked to the mass body, respectively, and a single elastic member that urges the key and the mass body to act in a swinging direction opposite to the swinging direction when the key is pressed. A keyboard device for an electronic musical instrument characterized by being equipped.