JP2528585Y2 - Electronic piano 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 piano.

[0002]

2. Description of the Related Art In a conventional electronic piano, as shown in FIG. 8, when a key a is depressed, a hammer b pressed against the rear end of the key a is rotated against a spring c and provided on the key a. The keyboard switch e is actuated by the actuator d, and the keyboard switch e
Is activated to generate a sound at a volume corresponding to a key touch.

[0003]

Acoustic pianos sound at a volume according to the speed of the hammer when the hammer hits a string. However, the above-mentioned conventional electronic piano produces a sound at a volume corresponding to the speed of the key a when the keyboard switch e is actuated. This sounding time does not correspond to the time when the hammer of the acoustic piano hits the string, and the key depressing speed of the key a does not necessarily correspond to the speed of the hammer of the acoustic piano.

[0004] Therefore, it has been difficult for the conventional electronic piano to produce sound at the same sound generation time and volume as an acoustic piano. It is an object of the present invention to solve the above-mentioned problems of the conventional electronic piano.

[0005]

According to the first aspect of the present invention, there is provided a keyboard device.
In a keyboard device for an electronic piano, a sound volume is controlled by a time from an operation of a first switch to an operation of a second switch by pressing a key, and sound is generated when the second switch is operated.
And a hammer which rotates by the force transmitted from the jack to jack pivoted to rotate by force transmitted from the key is rotatably supported on the keyboard frame, said first switch that by jack rotates It works at the beginning of movement ,
The second switch is operated by a turned hammer. According to a second aspect of the present invention, in addition to the configuration of the first aspect, a third switch operated by a key actuator is provided, and the sound is stopped when the third switch is not operated.

[0006]

According to the keyboard device of the first aspect, when the jack is rotated by the force transmitted from the key by pressing the key, the movement of the jack is changed.
First, the first switch is operated, and when the hammer is rotated by the rotation of the jack, the second switch is operated by the hammer. The time from the first switch is operated until the second switch is activated, acoustic piano odor
Until the hammer reaches the strings from the beginning of the jack movement.
From the operation of the first switch to the second
When the sound is generated at a volume corresponding to the time until the switch is activated, the sound is reduced to a maximum volume similar to that of an acoustic piano. The second switch is activated at a time close to the acoustic piano sounding time.

According to the keyboard device of the second aspect, when the key is released, the third switch is deactivated at the key stroke position corresponding to the key stroke position at which the damper of the acoustic piano contacts the string, and the damper is stopped. Plays the same role as.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
In FIG. 1, a key 1 has a keyboard frame 2 at its rear end.
And is returned to the illustrated position by a leaf spring 18 described later. A substantially L-shaped hammer 4 having a weight 3 at one end is rotatably supported at one end between a fulcrum and a tip of a hollow portion of the key 1 having a U-shaped cross section with an open lower portion. . The keyboard frame 2 is provided with a jack 5 having a shape as shown in FIGS.
Are rotatable by fitting to the support shaft 7,
Also, a first switch 8 operated by turning the jack 5, a second switch 9 operated by the hammer 4, and a key 1
Of the third switch 10 and the hammer 4 which are operated by an actuator (not shown)
1 is provided.

The jack 5 has a contact portion 13 which contacts the lower edges of both side walls 12 when the key 1 is depressed,
Operating part 14 and the hammer contact part 1 which operate with the switch 8 of
5, one end and the other end of the leaf spring 18 are respectively locked to the concave portion 16 of the jack 5 and the locking portion 17 fixed to the rear end of the hollow portion of the key 1. Each is returned to the initial position by the elastic force of the leaf spring 18. The third switch 10 operates at a key stroke position corresponding to a stroke position at which the damper of the acoustic piano separates from the string when the key 1 is depressed,
When the key 1 is returned to the original position, the damper is disabled at a stroke position corresponding to the key stroke position at which the damper contacts the string.

In FIG. 1, 19 is a key stopper, and 20 is a hammer stopper.

Next, the operation of the present embodiment will be described with reference to FIGS. When the key 1 shown in FIG. 1 is pressed, the key 1 rotates the hammer 4 via the jack 5 as shown in FIG.
When the switch is separated from the first switch 8 provided on the hammer 4, the switch is actuated and rotated, and is disengaged from the jack contact portion 4a of the hammer 4 as shown in FIG. The second switch 9 provided on the keyboard frame 2 is operated as shown in FIG. When the jack 5 is disengaged from the hammer 4 and let-off, the player feels the end of the keying operation, and when the hammer 4 rotates, a touch is obtained as if the hammer hits a string on an acoustic piano. After the second switch 9 is actuated, the hammer 4 is rotated counterclockwise by the weight 3 as shown in FIG. 6, and its end contacts the catcher 11 on the keyboard frame 2 to suppress the vibration of the hammer 4. And does not rotate to the key release position.
When the key is released, the key 1 returns to the initial position by a spring as shown in FIG. 1, and accordingly the jack 7 rotates clockwise by the elastic force of the leaf spring 18, and the hammer 4 returns to the initial position by gravity. Then, the jack 7 comes into contact with the jack contact portion 4a of the hammer 4 again. When the key is depressed and a tone corresponding to the time from the operation of the first switch 8 by the rotation of the jack 5 to the operation of the second switch 9 by the rotation of the hammer 4, a tone such as a speaker at the time of the operation of the second switch 9 is generated. When the sound is emitted from the sounding device and the key is released, the damper of the acoustic piano stops at the keystroke position corresponding to the keystroke position at which the string touches the string.

The first switch 8, the second switch 9, and the third switch
A well-known circuit may be used as the circuit for generating the tone signal having the above-mentioned volume by the operation of the switch 10. For example, FIG.
A circuit as shown in FIG.

FIG. 7 shows a main part. The first switch 8 and the second switch 9 (for four keys in the figure) of each key 1 have output terminals (OUT1, OUT2) and an input terminal (IN1) of the CPU 21. , IN2, IN3, IN4), the CPU 21 monitors the operation and non-operation of the first switch 8 and the second switch 9 by its software, and changes the operation of the first switch 8 to the second switch 9
Is counted from the speaker 22 at the time when the second switch 9 is activated, and a sound that attenuates to the maximum volume corresponding to the time is output from the speaker 22, and the third switch 1 is released by key release.
When 0 is not activated, the tone signal circuit is interrupted to stop the sound (this circuit is not shown in FIG. 7).

[0014]

According to the invention of claim 1, the operation of the jack is performed.
Depending on the speed from the beginning to reaching the hammerga string
Calling the intensity of the sound is very similar to the acoustic piano that Kemah
The sound is obtained, to take the dynamic range greater
And also fully support the performer's subtle expression
Effect is obtained that it is, also, according to the invention of claim 2, since the sound stop when key release the key acoustic piano damper returns to the key stroke position corresponding to the key stroke position in contact with the strings This has the effect that characteristics very similar to the sounding mechanism of an acoustic piano can be obtained.

[Brief description of the drawings]

FIG. 1 is a partially cut-away side view of an embodiment of the present invention.

FIG. 2 is a perspective view showing the relationship between the key and the jack.

FIG. 3 is an exploded perspective view of the hammer, the jack and the catcher.

FIG. 4 is a partially cutaway side view showing a first process during the key depression.

FIG. 5 is a partially cut-away side view showing the second process.

FIG. 6 is a partially cut-away side view showing the final process.

FIG. 7 is a block diagram of the main part.

FIG. 8 is a side view of a conventional electronic piano keyboard device.

[Explanation of symbols]

 Reference Signs List 1 key 2 keyboard frame 4 hammer 5 jack 8 first switch 9 second switch 10 third switch 18 leaf spring

Claims (2)

(57) [Scope of request for utility model registration] 1. A controlled volume by the time from the actuation of the first switch according to the key depression to the operation of the second switch, the keyboard apparatus of an electronic piano that sound upon actuation of the second switch, times the keyboard frame A jack that is movably supported and rotates by a force transmitted from the key, and a hammer that rotates by a force transmitted from the rotating jack,
The first switch starts its movement by the rotating jack.
And the second switch is actuated by a turned hammer. 2. A third actuated by a key actuator.
2. The electronic piano keyboard device according to claim 1, further comprising a switch, wherein the sound is stopped when the third switch is deactivated.