JPS63225296A - Key apparatus for electronic musical instrument - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a key device for an electronic musical instrument, particularly an electronic piano.

(Prior Art) Conventionally, as a key for an electronic piano, as shown in Fig. 10,
Appropriate weights al, a2, a on the top surface or inside of the end
3 is known to provide static characteristics of the load with respect to the key stroke as shown in FIG. 11, or characteristics similar to the static characteristics of a piano as shown in FIG. 9.

(Problems to be Solved by the Invention) The keys of the conventional electronic piano mentioned above provide a relatively low touch feel to the piano key, but even so, the reaction force of the action is affected by the strength of the keystroke on the piano. The dynamic characteristics are still unsatisfactory, as changes cannot be felt by the fingers. That is, in terms of dynamic characteristics, the I key of a conventional electronic piano has characteristics as shown in FIG.
This is significantly different from the dynamic characteristics of a piano as shown in FIG.

An object of the present invention is to provide an IT device for an electronic musical instrument that provides a touch more similar to the touch of a piano key than conventional devices.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention fixes a weight to the free end of a leaf spring whose one end is fixed to a key, and places a weight between the weight and the key. The present invention is characterized in that a cushion material that suppresses movement is provided, and a cushion material that comes into contact with the key when the key is pressed and suppresses the movement of the weight is provided.

(Function) In the piano, the action mechanism interposed between rIIA and hammer B includes cushioning materials such as felt and springs, so as shown in Figure 5, the spring constant is set to 2. It can be approximated as 2. Finger C also has a spring constant K.

Since the spring can be approximated as 1, when key A is pressed down with finger C, it can be considered that the force acts on the spring via .

Therefore, if hammer B is represented as a weight H2 of quality ff1lz, and key A is represented as a weight H7 of 11+, then finger C can be used as a weight 12A.
The striking mechanism of the piano keys when pressed is shown in FIG.

Now 11 with finger C! A is velocity V. The equation of motion when pressed is O1' However, ×blind and ×2 are the movements of J3, H7, and H2, respectively.

Solving equation (1) and finding the force F(0) applied to finger C, we get (
2) To illustrate the equation, velocity V. Size of 1.0~2.
0m/5ec (Forte f), 0.5~1.0TrL/
Sec (Mezzo forte mf), o, 3~0.5m/s
ec (mezzo piano mp>, 0.05~0.3m/s
When a key is pressed on the ec (piano p), the key depression response to the key stroke is as shown in the seventh figure.

This characteristic is similar to the measured dynamic characteristic of the piano shown in FIG. 8, and it can be seen that the above-mentioned approximation is valid.

Therefore, if the keys of an electronic piano can be approximated as shown in FIG. 6, it will be possible to obtain a touch feeling similar to that of a digital piano when the keys are pressed.

In the present invention, the leaf spring having one end fixed to the key and a weight fixed to the other end corresponds to spring 2 in FIG. 6, and the weight corresponds to weight H2, so the key configured in this way can be If you press it with your finger, you can get a key touch similar to that of a piano.

The cushioning material interposed between the weight and the key suppresses the movement of the weight and prevents the unstable position of the weight from adversely affecting the key touch. In addition, the cushion material that comes into contact with the key when the key is pressed and suppresses the movement of the weight prevents the weight from jumping up and making its position extremely unstable, which adversely affects the touch of the key. acts to prevent damage.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the invention.

In FIG. 1, 1 is a key, one end of a leaf spring 3 is fixed to the upper surface of its front end (right side in the figure) via a seat piece 2, and a weight 4 is fixed to the upper surface of the other end of the leaf spring 3. is fixed. Further, a cushioning material 5 is bonded to the upper surface of the key 1 corresponding to the weight 4, and the cushioning material 5 substantially contacts the leaf spring 3 when the lPl is at rest. 6 is shelf board 1
It is a cushioning material that is fixed to a key stopper 8 fixed to the key stopper 8 and that the weight 4 comes into contact with when the key 1 is pressed down.

In FIG. 1, reference numeral 9 denotes a mouth-shaped leaf spring fixed to the lower surface of the key 1, and at least a part of it is fixed at both ends to the shelf board 7. It comes into pressure contact with the surface of a rectangular member 10 made of a friction material, and when the key 1 is pressed, it slides on the surface and Il! This creates friction and improves the touch feeling when the key 1 is returned.

11 is a switch that opens when key 1 is pressed and activates a circuit for producing sound (not shown); 12 is made of cushioning material &I! It's a board pillow.

The leaf spring 3 is located at the front end of the rnl (as shown in the third figure).
One end of the leaf spring 3 may be directly fixed to the lower surface (on the right side of the figure), and in this case, the dust 4 fixed to the upper surface of the other end of the leaf spring 3 is
It is formed in an L shape so as to face the top surface from the end surface of the key 1, and a cushion material 5 is placed on the top surface of the key 1 facing the weight 4.
is glued. In FIG. 3, the rectangular member 10 is attached to a support member 13 which is secured to the key stop 8. In FIG. The embodiment shown in the third figure also functions in the same manner as the one shown in the first figure, but since the tip of the plate spring 3 protrudes from the front end of the key 1, it can be made shorter than the key 1 shown in the first figure. In addition, the mouth-shaped leaf spring 9 is t! Since it can be fixed to the upper surface of the key 11, there is an advantage that the leaf spring 9 is not deformed when the key 1 is mounted on the shelf board 7, compared to the one shown in the first figure.

FIG. 4 does not show another embodiment of the present invention applied to a key made of synthetic resin.

The key 1 is rotatable by a shaft 14 that fits into a recess on the front end surface, and is returned to its original position by a spring (not shown).
Since four parts 15 are formed on the lower surface, the leaf spring 3 is attached to this part.
The plate spring 3 is housed with one end fixed, a weight 4 is fixed to the lower surface of the other end of the leaf spring 3, and a cushioning material 5 is fixed to the bottom wall of the ull facing the weight 4, thereby preventing the position of the weight 4 from becoming unstable. I am trying to resolve this. The cushion material 6 shown in FIGS. 1 and 3 is fixed to the shelf board 7 in this embodiment.

In the embodiment shown in the first figure, to give a specific example in which good characteristics were obtained, the leaf spring 4 has a length of 50 to 150 s and a thickness of
At 0.5-2HR, the weight 4 was 20-100g.

(Effects of the Invention) As explained above, according to the present invention, it is possible to obtain a key touch that is very similar to a piano key touch with a simple structure.

[Brief explanation of drawings]

FIG. 1 is a side view of one embodiment of the present invention, FIG. 2 is a perspective view of the main parts thereof, and FIGS. 3 and 4 are a side view and a sectional view of another embodiment of the present invention, respectively. Figures 5 and WN2 are explanatory diagrams for analyzing piano key touches, Figure 7 is a dynamic characteristic diagram of the key stroke versus load of the approximate model calculated, and Figure 8
The figure shows a dynamic characteristic diagram of piano key stroke vs. load based on experiments, Figure 9 shows a static characteristic diagram of piano key stroke vs. load, Figure 10 is a side view of a conventional electronic piano key device, and Figure 11 shows its characteristics. FIG. 12 is a static characteristic diagram of key stroke vs. load, and FIG. 12 is a dynamic characteristic diagram of key stroke vs. load. 1... Key 3... Leaf spring 4... Weight 5.6... 2 people outside the cushioning material - Lock - Stroke Figure 10 Figure 11 Figure 12

Claims (1)

[Claims] A weight is fixed to the free end of a leaf spring whose one end is fixed to the key,
A key for an electronic musical instrument, characterized in that a cushioning material is provided between the weight and the key to suppress the movement of the weight, and a cushioning material is provided that comes into contact with the key when the key is pressed to suppress the movement of the weight. Device.