JPH089757Y2 - Keyboard device - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to a keyboard device for an electronic musical instrument that turns contacts on and off by keying and releasing keys.

(Prior Art) Conventionally, as a keyboard device of this type, there is known a device in which a plurality of (rubber) contacts 3 are mounted on a frame 2 corresponding to each key 1 as shown in FIG. And
The volume and timbre can be changed according to the keystroke speed and strength.

When the key is released, the key 1 is returned to the upper limit position by the key return spring 4 arranged near the swing fulcrum X between the key 1 and the frame 2, and the upper limit is limited by the stopper 5. ing.

(Problems to be solved by the invention) However, in the conventional keyboard device, the key cannot be returned to the upper limit position without the key return spring. Therefore, the key return spring must be prepared for each key. However, there is a problem that the number of parts and the number of assembling steps increase.

In addition, since the key return spring is located near the swinging fulcrum of the key, the spring load becomes very large, and there are many problems with the strength of the key and the frame, and there is variation in the key touch load at the tip of the key. There was an inconvenience that it was too big.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a plurality of keys, a frame for supporting the keys, and a mounting on the frame corresponding to the plurality of keys. Characterized in that the head of the contact located farthest from the rocking fulcrum of the key is always in contact with the actuator of the key to add a key restoring force. To do.

(Operation) As described above, by applying a key restoring force to the contact point, the present invention serves to return the contact point to the OFF state and release the key to the upper limit position when releasing the key. .

By mounting the contact at a position farthest from the swinging fulcrum of the key, there is an effect of reducing the load required for returning the key.

Further, there is also an effect of reducing variations in the key touch load.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a key, and a plurality of keys 1 are integrally formed on a common mounting portion 1b via a hinge portion 1a. Two
Is a frame, which fixes the common mounting portion 1b, supports the keys 1 swingably, and fixes the contacts 3 mounted corresponding to the respective keys 1. The contact 3 is a rubber contact in which a first contact 3a and a second contact 3b are integrally formed, as shown in the second illustration, and the frame 3 and the printed circuit board 6 sandwich the contact 3 for mounting. The first contact 3a is formed to have a dome shape in order to apply a key return force for returning the key 1, and the head of the first contact 3a is an actuator on the lower surface of the key 1.
Contact 1c.

At this time, the first contact 3a to which the key return force is added is attached at the position farthest from the key swing fulcrum X.

Next, the operation will be described. First, the first contact 3a
Comes into contact with the fixed contact on the printed circuit board 6 and turns on, and then comes into contact with the second contact 3b as well, turning on the first contact and the second contact.
The volume is determined according to the time difference when it is turned on. When the key is subsequently released, the elastic force of the rubber of the first contact 3a formed in a dome shape causes the key 1 to return to the upper limit position and the second contact 3a.
3b is turned off, and then the first contact 3a is turned off.

Explaining the contacts here, the first contact 3a is the first contact that is turned on by keystroke, and the second contact 3a
The contact 3b is the second contact that is turned on. (Same as the following) In the above first embodiment, since the key restoring force is applied to the first contact 3a, the first contact 3a is mounted at the position farthest from the swinging fulcrum X of the key 1, but the second contact 3b is attached. When the key return force is applied, the second contact 3b is attached at a position farthest from the swinging fulcrum X of the key 1, although not shown.

The upper limit position of the key 1 is limited by the stopper 5.

 Another embodiment will be described with reference to FIG.

In FIG. 3, the contact 3 is composed of a first contact 3a, a second contact 3b, and a third contact 3c. By detecting the acceleration of the key 1, it is possible to change the volume and the tone color according to the acceleration. It is possible.

Also in this case, as in the above-described embodiment, the first contact 3a is formed in a dome shape to add a key restoring force.

In FIG. 3, in consideration of the load of the first contact 3a to which the key restoring force is added, the key is arranged at the position farthest from the key swing fulcrum X, but not limited to this, the second contact 3b or third contact A key return force may be added to 3c, and the contact point to which the key return force is added may be attached to a position farthest from the swing fulcrum X of the key 1.

 Next, a second embodiment will be described.

FIG. 4 is a view for explaining the second embodiment, in which the frame 2 is integrally molded with the musical instrument case (upper) 7a, and the key 1 is the musical instrument through the hinge portion 1a and the common mounting portion 1b. Attach it to the upper back surface of the case (upper) 7a. The contact point 3 is a rubber contact point in which the first contact point 3a and the second contact point 3b are integrally molded, and is attached by sandwiching it between the frame 2 and the printed circuit board 6. Also in FIG. 4, the first contact 3a is formed in a dome shape to add the key return force, but the present invention is not limited to this, and the key return force is added to the second contact 3b to form the second contact 3b. May be attached at a position farthest from the swing fulcrum X of the key 1.

 In addition, 7b is a musical instrument case (bottom).

(Effect of the Invention) As described above, according to the present invention, since the key return force is added to the contacts, the key return spring that had to be prepared for each sub key can be eliminated. The number of parts and the number of assembly steps can be significantly reduced.

Further, by mounting the contact point to which the key return force is added at the position farthest from the key swing fulcrum, the load required for the key return becomes smaller than before, and the disadvantage that the key or frame is deformed can be eliminated. . In addition to that, variations in the key touch load can be reduced, and by molding the frame integrally with the musical instrument case, the number of parts can be reduced, and cost can be reduced.

[Brief description of drawings]

1 and 2 are views showing a first embodiment of the present invention, and FIG.
FIG. 5 is a diagram showing a second embodiment of the present invention, FIG. 3 is a diagram showing another embodiment, and FIG. 5 is a diagram showing a conventional example. 1 …… Key, 1a …… Hinge part, 1b …… Common mounting part, 1c ……
Actuator, 2 ... Frame, 3 ... Contact, 3a ...
1st contact, 3b ... 2nd contact, 3c ... 3rd contact, 4 ... Keyboard return spring, 5 ... Stopper, 6 ... Printed circuit board, 7 ... Instrument case.

Claims (1)

[Scope of utility model registration request] 1. A plurality of keys 1, a frame 2 supporting the keys 1, and a plurality of dome-shaped rubber contacts 3 attached to the frames 2 corresponding to the plurality of keys 1, Of the plurality of contacts 3, the head of the contact 3a farthest from the swinging fulcrum X of the key 1 is always in contact with the actuator 1c of the key 1 to urge the key return force. Keyboard device.