JPH0467194B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a keyboard device for an electronic musical instrument in which the touch feel at the initial stage of key depression approximates that of a general piano.

[Prior art]

The feel when playing a key, that is, the touch feeling, is significantly different between a general piano and a keyboard device of an electronic musical instrument such as an electronic organ. In other words, in the case of a piano, the load from the action mechanism and the frictional force between the oval key pin and the felt, which restricts the horizontal rotation of the key, make the key feel heavy at the beginning of the key press, and then, if the jack is a grand piano, the repetition lever The reaction force applied by the fingertips is rapidly reduced by temporarily escaping from the bottom of the button (butt in an upright piano), whereas in the case of an electronic musical instrument, the reaction force applied by the fingertips is reduced by simply pushing the key against the force of the spring. Since the keyboard is configured to operate a key switch using a key actuator when a key is pressed, the reaction force of the spring increases as the key is pressed down, contrary to a piano, making the touch feel heavier. Therefore, when practicing playing on an electronic musical instrument, it was difficult to get used to the piano and make a smooth transition to the piano.

Therefore, various proposals have been made to approximate the touch feel of electronic musical instruments to the touch feel of a piano, but all of these proposals reduce the friction of the pivot point so that the keys can easily rotate. It was difficult to make the initial touch feel of the key heavy.

[Summary of the invention]

The present invention has been made in view of the above-mentioned points, and includes a key support member provided with a fulcrum portion having a curved surface, and a rotation fulcrum portion having a curved surface that frictionally engages with the fulcrum portion. a key supported by a support member so as to be swingable in the vertical direction; a spring locking part forming a part of the key and extending to a position opposite to the rotation fulcrum part; One end of a spring that does not act on the return force of the key is locked to a fulcrum part of the key support member, and the other end is locked to a spring locking part of the key. By stopping and pressing the curved surface of the fulcrum part and the curved surface of the rotation fulcrum part into frictional engagement,
It is an object of the present invention to provide a keyboard device for an electronic musical instrument that increases the frictional force between these fulcrum parts and makes the touch feel at the initial stage of key depression as heavy as that of a piano.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

1A and 1B are a plan view and a vertical sectional view showing an embodiment of the keyboard device according to the present invention applied to a white key, FIG. 2 is a perspective view of the main part of the same white key, and FIG. 3 is a FIG. 3 is a perspective view of the main parts of the keyboard frame. In these figures, reference numeral 1 denotes a white key in the form of an elongated rectangular rod integrally formed from a synthetic resin material, and the white key 1 has a roughly U-shaped cross-sectional shape by being formed by hollowing out the bottom surface. A projection 2 is integrally hung on the inner ceiling surface 1a slightly rearward from the center.
Its lower end has an engagement recess 6 that engages from above with a fulcrum 5 provided on the keyboard frame 3, thereby forming a rotation fulcrum 2A. The engagement recess 6 is formed in an arc shape from the middle part of the front end surface to the lower surface of the rotation fulcrum part 2A. The fulcrum portion 5 is constructed by forming the front end edge of the insertion hole 4 bored in the keyboard frame 3 into an arcuate tongue having approximately the same curvature as the engaging recess 6.

On the inner surface of the rear end of the white key 1, there is a first
In FIG. b, a weight 7 is fixed as a key return means for imparting a clockwise return habit around the pivot point 2A. Further, the white key 1 has a substantially fishing-shaped stopper 8 which is hung from the inner ceiling surface of the front end thereof and whose lower end is bent almost horizontally toward the rear.
A bent portion 8A of the stopper 8 is engaged in a through hole 9 formed in the front vertical wall 3A of the keyboard frame 3 so as to be movable up and down. Therefore, white key 1
is arranged on the keyboard frame 3, and is allowed to rotate by a small angle in the vertical direction within the range of the through hole 9.
Normally, due to the return behavior of the weight 7, the folded portion 8A
is held horizontally by contacting the upper end of the through hole 9 via the buffer member 10, and when a key is pressed, the rotation fulcrum portion 2A slides on the upper surface of the fulcrum portion 5 of the keyboard frame 3. The actuator 11 provided integrally with the white key 1 operates the key switch 12 attached to the lower surface of the keyboard frame 3 as the white key 1 rotates counterclockwise.

Further, a spring holding piece 13 is integrally and vertically provided on the inner ceiling surface 1a of the white key 1, located in front of the protrusion 2. This spring holding piece 13 extends below the frame 3 by passing through a through hole 14 formed in the keyboard frame 3, and has a spring retaining member extending below the rotation fulcrum part 2A on the lower end back surface of the spring holding piece 13. A stop portion 15 is integrally provided, and above the spring lock portion 15, a spring temporary lock portion 16 consisting of a pair of left and right protrusions is integrally provided to protrude. And the spring locking part 1
5 and the fulcrum 5 of the keyboard frame 3 is a compression coil spring 17 having a relatively large spring force, and this spring 17 biases the white key 1 vertically downward and rotates it. The engagement recess 6 of the fulcrum portion 2A is pressed onto the fulcrum portion 5.

In addition, 20 is a key guide that restricts the left and right rotation of the white key 1, 21 is a lower limit stopper made of felt, etc., and 22 is a key fall prevention device that prevents the white key 1 from moving backward and detaching from the keyboard frame 3. Element,
23 is felt, and 24 is a mold punching hole.

Note that in this embodiment, for example, the key guide 20,
The keyboard frame 3, which includes a lower limit stopper 21, a key switch 12, a key fall prevention member 22, a key fulcrum part 5, etc., functions as a key fulcrum member, and for example, the fulcrum part 5 functions as a fulcrum part.

Thus, according to the keyboard device having such a configuration, the compression coil spring 17 allows the rotation fulcrum portion 2A of the white key 1 and the fulcrum portion 5 provided on the keyboard frame 3 to be rotated.
Since the frictional force between the
The touch feeling at the beginning of key presses becomes heavy. Further, since the weight 7 is used as the key return means, when the white key 1 starts to rotate after being pressed, its inertia is large, reducing the reaction force felt by the fingers. Therefore, the key is heaviest at the beginning of the key press, and becomes lighter thereafter, making it possible to obtain a touch feeling similar to that of a piano. Moreover, since the upper end of the compression coil spring 17 is locked to the lower surface of the fulcrum portion 5 and is aligned with the rotational fulcrum position of the white key 1, there is no influence on the return force of the white key 1. do not have.

Furthermore, when attaching the white key 1 to the keyboard frame 3, the lower end of the compression coil spring 17 is locked to the protrusion 15 of the spring holding part 13, and the upper end is attached to the temporary locking part 16.
After that, with the white key 1 tilted forward and downward, insert the bent part 8A of the stopper 8 into the through hole 9, and in this state, the rear end of the white key 1 Lower the side, insert the rotation fulcrum part 2A and the spring holding part 13 into the insertion hole 4 and the through hole 14, place the engagement recess 6 on the upper surface of the fulcrum part 5, and then insert the upper end of the spring 17. Since it is only necessary to remove it from the temporary locking part 16 and lock it to the lower surface of the fulcrum part 5, the installation work is simple and easy. In addition, if grease or the like is applied to the engagement recess 6 of the rotation fulcrum portion 2A, smooth movement of the white key 1 can be obtained from the initial stage of key depression while producing a heavy touch feeling at the initial stage of key depression.

FIG. 4 is a sectional view showing another embodiment in which the present invention is applied to a black key. In this embodiment, a tension coil spring 30 is used as the key return means, one end of which is provided on the upper surface of the rear end of the black key 31, and the other end is provided integrally with the rear end of the keyboard frame 3, and is bent upward. The only difference from the above embodiment is that the upper ends of the portions 32 are respectively engaged, and the rest is essentially the same.

In each of the above embodiments, the compression coil spring 17 that increases the touch feeling at the initial stage of pressing the key is arranged almost vertically, but the rotation fulcrum part 2 is not limited to this.
By changing the shape of A and the fulcrum part 5 and providing the spring locking part 15 in front or behind the rotation fulcrum part 2A, it is also possible to arrange it horizontally.

In addition, in each of the above embodiments, the compression coil spring 1
7 is used, however, a spring of an appropriate shape such as an Ω shape may also be used.

〔Effect of the invention〕

As explained above, in the limited board device for an electronic musical instrument according to the present invention, there is a gap between the key which is rotatably disposed on the key support member and has been given a return habit by the key return means, and the key support member. one end is locked to a fulcrum part of a key support member that supports the rotation fulcrum part of the key, and the other end is provided on the key and is located longitudinally forward, rearward, or vertically below the rotation fulcrum part of the key. A spring that is locked to the spring locking part is interposed, and this spring presses the rotational fulcrum part to the fulcrum part of the key support member, so that the touch feeling at the initial stage of pressing the key is heavy, making it similar to that of a general piano. You can get a feeling of touch.

[Brief explanation of the drawing]

Figures 1a and b are a plan view and a sectional view showing an embodiment of the keyboard device according to the present invention applied to a white key, Figure 2 is a perspective view of the main part of the white key, and Figure 3 is a keyboard. FIG. 4 is a perspective view of the main part of the frame and a sectional view when the present invention is applied to a black key. 1... White key, 3... Keyboard frame, 5... Fulcrum, 6... Engagement recess, 7... Weight, 15... Spring locking part, 17... Compression coil spring, 31... Black key .

Claims (1)

[Scope of Claims] 1. A key support member provided with a fulcrum portion having a curved surface, and a rotation fulcrum portion having a curved surface that frictionally engages with the fulcrum portion, the key support member being swingable in the vertical direction. a key disposed in a supported manner; a spring locking portion forming a part of the key and extending to a position opposite to the rotation fulcrum portion; and a key return means for imparting a return habit to the key. , one is locked to the fulcrum part of the key support member and the other is locked to the spring locking part of the key, and the curved surface of the fulcrum part and the curved surface of the rotation fulcrum part are brought into pressure contact and frictionally engaged. A keyboard device for an electronic musical instrument, characterized by comprising a spring and.