JP3296462B2 - 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 an electronic organ, and more particularly to an improvement in an operation mechanism of a keyboard switch for detecting a pressed state of a keyboard.

[0002]

2. Description of the Related Art In general, in a keyboard device of an electronic musical instrument, a keyboard switch for detecting a depressed state of a keyboard is provided opposite to each keyboard or each hammer, and each keyboard or each hammer is provided with a keyboard. A pressing portion for operating the switch is provided. When a key is pressed, a keyboard switch is pressed by a pressing portion of the keyboard or a hammer to detect whether or not a key is pressed and a key pressing speed (velocity). It is designed to pronounce musical instruments.

Such a keyboard device is disclosed in, for example,
No. 175191 and Japanese Utility Model Laid-Open No. 1-13893. In these keyboard devices, a pressing portion is provided on the lower surface of the keyboard, and a keyboard switch is disposed directly below the pressing portion. The shape of the pressing portion is formed in a cross shape or a “three” shape, while the pressed portion is formed in a pressed portion. The upper surface of a certain keyboard switch is formed in a ring shape. When a key is pressed, the pressing portion straddles the ring-shaped pressed portion of the keyboard switch, and contacts and presses the ring-shaped pressed portion to activate the keyboard switch.

[0004]

However, in the above-mentioned conventional keyboard device, since the pressing portion of the keyboard is configured to come into contact with the pressed portion of the keyboard switch at a plurality of locations, the keyboard is manufactured. Due to lack of precision or assembly accuracy, or because the keyboard was hit at a position shifted from the center in the width direction,
There is a case where the keyboard rotates in a state of being inclined obliquely when viewed from the front, in which case, the pressing portion obliquely contacts the pressed portion of the keyboard switch, and each contact point is pressed with an uneven force. Would. As a result, the operation of the keyboard switch becomes unstable, and the sound of the electronic musical instrument is adversely affected.

The drawbacks of such a conventional keyboard device become more remarkable in the case of a type in which a pressing portion is provided on a hammer and a keyboard switch is operated via the hammer. That is, since the rotation angle of the hammer is generally larger than that of the keyboard, the angle of the pressing portion provided on the hammer fluctuates greatly during the rotation. For this reason, the pressing portion of the hammer easily hits the pressed portion of the keyboard switch obliquely, and the operation of the keyboard switch also becomes unstable.

The present invention has been made to solve such a problem, and an electronic musical instrument capable of stably operating a keyboard switch even when a keyboard or a hammer strikes the keyboard switch at an angle. The purpose of the present invention is to provide a keyboard device.

[0007]

In order to achieve the above object, the present invention has a rotatable keyboard having a pressing portion, and a pressed portion opposed to the pressing portion. When moved, the pressed part is pressed by the pressing part,
A keyboard switch for detecting a pressed state of the keyboard, wherein the pressing portion is provided with a band-shaped protrusion, and the pressed portion is provided with a band-shaped protrusion extending in a direction intersecting with the protrusion of the pressing portion. It is characterized by having.

Further, the present invention has a rotatable keyboard, a pressing portion, a hammer that rotates in conjunction with the keyboard, and a pressed portion facing the pressing portion. A keyboard switch that detects a pressed state of the keyboard when the pressed portion is pressed by the pressing portion when rotated. Is
A band-shaped projection extending in a direction intersecting with the projection of the pressing portion is provided.

[0009]

According to the keyboard device of this electronic musical instrument, when the keyboard is depressed and turned, the pressing portion presses the pressed portion of the keyboard switch opposed thereto, whereby the keyboard switch is operated. Detects the key pressed state. in this case,
A band-shaped projection is provided on the pressing portion of the keyboard, and a band-shaped projection extending in a direction intersecting with the projection of the pressing portion is provided on the pressed portion of the keyboard switch. Even when the keyboard is hit from an oblique direction, the keyboard always comes into contact with the keyboard switch at one point via these projections, so that the keyboard switch can be operated stably.

Further, in the keyboard device according to the second aspect, when the keyboard is depressed and turned, the hammer is rotated in conjunction therewith, and the pressing portion thereof is pressed by the keyboard switch opposed thereto. By pressing a part, a keyboard switch is activated to detect a key pressed state of the keyboard. In this case, the pressing portion of the hammer is provided with a band-shaped protrusion, and the pressed portion of the keyboard switch is provided with a band-shaped protrusion extending in a direction intersecting with the protrusion of the pressing portion. Even if you hit the keyboard switch diagonally, the hammer
The keyboard switch can be operated stably by making sure that the keyboard switch comes in contact with the keyboard switch at one point via these protrusions.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a keyboard device for an electronic piano according to a first embodiment of the present invention. As shown in FIG. 1, the keyboard device includes a keyboard chassis 1, a keyboard 2 rotatably supported at a rear end portion by a keyboard chassis 41, and a rotatable mounting near a central portion of the keyboard chassis 1. And a keyboard switch 4 fixed to the keyboard chassis 1 to detect a pressed state of the keyboard 2.

The keyboard 2 is entirely made of resin.
The rear end is rotatably supported by a bearing member 5 fixed to the keyboard chassis 1. A hook-shaped stopper 6 is formed at the front end of the keyboard 2, and an upper limit stopper 7 and a lower limit stopper 8 are provided on the lower and upper surfaces of the front end of the keyboard chassis 1, respectively. The upward rotation is regulated by the stopper portion 6 abutting against the upper limit stopper 7, and the downward rotation is regulated by the lower surface of the keyboard 2 abutting on the lower limit stopper 8.

The keyboard 2 is provided with a hammer pressing projection 9 at a position approximately one-third of the length from the rear end so as to protrude downward. 10
Is in contact with the upper surface of the In the same drawing, the projections 9 for pressing the hammer for the white key and the black key are drawn together. The front one is for the white key, and the rear one is for the black key.

The hammer 3 is rotatably supported by the keyboard chassis 1 via a support shaft 11 at a position slightly behind the hammer pressing projection 9. The hammer 3 includes the contact portion 10 described above located on the front side of the support shaft 11, a planar switch pressing portion (pressing portion) 12 provided below the contact portion 10, and the hammer 3. And an arm 13 extending long rearward. On the lower surface of the switch pressing portion 12, a band-shaped protrusion 14 extending in the front-rear direction is formed. Above the rear end of the arm 13, a stopper cushion 15 is provided fixed to the keyboard chassis 1.

The keyboard switch 4 is arranged below the switch pressing portion 12 of the hammer 3 so as to face the switch pressing portion 12, and is attached to the upper surface of a printed board 16 fixed to the keyboard chassis 1. The keyboard switch 4 is composed of a rubber switch as shown in FIG. 2, and the rubber body 17 is composed of a rear horizontal part 17a and a forwardly inclined part 17b connected to the horizontal part 17a. At the rear end of the upper surface of the horizontal portion 17a, a band-shaped protrusion 21 extending in a direction perpendicular to the protrusion 14 of the hammer 3 (a depth direction on the paper surface of FIG. 1) is formed (see FIG. 2). In this state, the projection 21 of the keyboard switch 4 is
And are opposed to each other with a slight space therebetween.

The keyboard switch 4 also includes two switch elements S ₁ and S ₂ that respectively hang from the horizontal portion 17a and the inclined portion 17b, and a conductive rubber contact disposed below the switch elements S ₁ and S _2. C ₁ and C ₂ are provided.
The contacts C ₁ and C ₂ are opposed to corresponding contacts (not shown) formed on the printed board 16 at predetermined intervals, respectively, and the contacts of the printed board 16 are connected to a sound control device (not shown). Have been.

Next, the operation of the keyboard device 1 having the above configuration will be described. When the keyboard 2 is depressed, the projection 9 for pressing the hammer presses the contact portion 10 of the hammer 3 to rotate the hammer 3 in the counterclockwise direction in the figure. It comes into contact with the protrusion 21 and presses it. As a result, the main body 17 of the keyboard switch 4 rotates with its front end as a fulcrum, and the switch elements S ₁ and S ₂
With different keystroke strokes, the lower contact points C ₁ and C ₂ are sequentially contacted and pressed. Accordingly, the contacts C ₁ ,
By contacting the contact of the printed circuit board 16 with C ₂ ,
ON signals are sequentially output. The ON signal is output to a sound control device (not shown), and the sound control device determines whether or not a key is pressed on the keyboard 2 by turning on / off the keyboard switch 4 based on the ON time difference between the _two switch elements S ₁ and S _2. The key speed is determined, and the sound generation of the electronic piano is controlled based on the determined results.

In this case, the switch pressing portion 12 of the hammer 3 which is the pressed portion and the horizontal portion 17a of the keyboard switch 4 which is the pressed portion are provided with projecting portions 14 and 21 extending in a band shape in directions orthogonal to each other. Therefore, regardless of the inclination angle of the hammer 3 when the keyboard switch 4 is pressed, the hammer 3 always contacts the keyboard switch 4 at one point via these projections 14 and 21 (see FIG. 2). . Therefore, the keyboard switch 4 can always be operated stably, and the sound control by the sound control device can be performed well. Further, since the hammer 3 and the keyboard switch 4 are brought into one-point contact by the band-shaped projections 14 and 21, even if the manufacturing accuracy and the assembling accuracy of the hammer 3 and the keyboard switch 4 are not so high, the one-point contact between the two. The state can be secured.

In the keyboard switch 4 described above, in order to ensure a one-point contact state with the hammer 3, the main body 17 is moved downward with the horizontal portion 17a on the rear side in accordance with the inclination of the hammer 3. Although it is constituted by the inclined portion 17b,
The keyboard switch 4 can have another configuration. For example, as shown in FIG. 3, the keyboard switch 4 may be configured such that the main body 17 is symmetrical in the front-rear direction similarly to a normal keyboard switch, and a band-shaped projection 21 may be provided on the upper surface thereof. The same effect as described above can be obtained.

FIG. 4 shows a keyboard device according to a second embodiment of the present invention. As shown in FIG.
It is a hammerless type, and the keyboard switch 4 is directly pressed by the keyboard 2. That is, in this keyboard device, the hammer 3 is omitted, the keyboard switch 4 is disposed in the front-reverse direction, and the keyboard 2 has the keyboard switch 4 in comparison with the keyboard device of the first embodiment shown in FIG. The only difference is that the switch pressing projection 18 for operating the switch is directly formed. The switch pressing projection 18 has a plate-like shape extending downward from the vicinity of the upper surface of the keyboard 2 and extending in the front-rear direction. The lower end of the switch pressing projection 18 constitutes a band-shaped projection 19. This projection 19
Is opposed to the projection 21 of the keyboard switch 4.

Therefore, according to the present embodiment, even when the keyboard 2 is turned obliquely when viewed from the front, the projection 19 of the switch pressing projection 18 is provided at one point on the projection 21 of the keyboard switch 4. As a result, the keyboard switch 4 can be operated stably at all times, as in the above-described embodiment, and the sound control by the sound control device can be performed well. Reference numeral 20 in the figure is a return spring for returning the keyboard 2 to the key release position.

As described above, according to the keyboard device of this embodiment, the hammer 3 or the lower surface of the keyboard 2 is provided with the strip-shaped projections 14 or 19 extending in the front-rear direction, while the horizontal portion 17a of the keyboard switch 4 is provided on the horizontal portion 17a. , And a strip-shaped projection 21 orthogonal to the projections 14 and 19 is provided.
Alternatively, even when the keyboard 2 hits the keyboard switch 4 from an oblique direction, the keyboard switch 4 can always be pressed in a one-point contact state. Therefore, the keyboard switch 4 can always be operated stably, and the electronic piano can be sounded satisfactorily. Further, such a one-point contact state can be easily realized without requiring high production accuracy and assembly accuracy for the keyboard 2, the hammer 3, and the keyboard switch 4.

The present invention is not limited to the above-described embodiment, but can be implemented in various modes. For example, in the embodiment, the protrusion of the keyboard switch extends in a direction orthogonal to the protrusion of the hammer and the keyboard. However, from the point of the present invention, it is sufficient that both protrusions contact at one point. It is also possible to arrange the projection of the keyboard switch so as to extend diagonally with respect to the projection of the hammer and the keyboard. Although the embodiment is an example of an electronic piano, it goes without saying that the present invention can be applied to other types of electronic musical instruments using keyboard switches. In addition, the detailed configuration can be appropriately changed without departing from the spirit of the present invention.

[0024]

As described in detail above, the keyboard device for an electronic musical instrument according to the present invention has an effect that the keyboard switch can be operated stably even when the keyboard or the hammer strikes the keyboard switch at an angle. It has.

[Brief description of the drawings]

FIG. 1 is a side view of a keyboard device according to a first embodiment of the present invention.

FIG. 2 is a plan view and a sectional view of a keyboard switch of the keyboard device of FIG. 1;

FIG. 3 is a plan view and a sectional view showing another example of the keyboard switch.

FIG. 4 is a side view of a keyboard device according to a second embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 2 keyboard 3 hammer 4 keyboard switch 12 hammer switch pressing portion 14 switch pressing portion projection 18 switch pressing projection 19 keyboard projection 21 keyboard switch projection

Claims (2)

(57) [Claims] A rotatable keyboard having a pressing portion; and a pressed portion facing the pressing portion, wherein when the keyboard is pressed and turned, the pressed portion is pressed by the pressing portion. A keyboard switch for detecting a pressed state of the keyboard by being pressed, wherein the pressing portion is provided with a band-shaped protrusion, and the pressed portion intersects with the protrusion of the pressing portion. A keyboard device for an electronic musical instrument, comprising a band-shaped projection extending in a direction. 2. A keyboard having a rotatable keyboard, a pressing portion, a hammer rotating in conjunction with the keyboard, and a pressed portion facing the pressing portion, wherein the keyboard is depressed and rotated. And a keyboard switch for detecting a pressed state of a keyboard when the pressed portion is pressed by the pressing portion, wherein the pressing portion is provided with a band-shaped protrusion, and the pressed portion is A keyboard-like keyboard device for an electronic musical instrument, further comprising a band-like projection extending in a direction intersecting with the projection of the pressing portion.