JP2000099001A - Keyboard device and electronic musical instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To create key touch senses with fine moire at a low price by forming the mass bodies of hammers in the same external shape and making the senses different by making holes at end parts different in size and making the mass bodies different in weight. SOLUTION: The mass body 35-2 of a hammer 35 is worked in the same external shape by sheet metal press formation work and the expanded tip part is provided with a weight adjusting hole 35-5 and formed to the size corresponding to the position where the hammer 35 is arranged. Namely, hammers are made to correspond to white keys 31 and black keys 32 which are arranged in high pitched tone order, successively the weight adjusting holes 35-5 which are arranged on a low pitched tone side, are made small and the weight adjusting holes 35-5 which are arranged on the high pitched tone side, are made small. The pressing forces and textures of the keys 31 and 32 are determined by the moment of rotation by the gravitational operation of the hammers 35, the moment of inertia and the compression resistance and restoring force of rubber switches 37. Then, the white keys 31 and black keys 32 which are arranged in the high pitched tone are made to touch senses changing so as to lighten in order from the low pitched tone side to the high pitched tone side.

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 operation terminal having a key and an electronic musical instrument.

[0002]

2. Description of the Related Art FIG. 10 is a perspective view in which a part of a general electronic keyboard instrument is cut out. An electronic circuit device 2 including a sound source device and the like is built in a cabinet 1, and a performance operation surface includes:
A keyboard device 3 and a panel switch 4 for switching a tone color are provided.

FIG. 11 is an electrical functional block diagram of a general electronic keyboard instrument. The electronic circuit device 2 includes scanning detection means 21 for sequentially detecting the operation states of the keyboard device 3 and the panel switch 4 by a scanning detection method, and a sound source device 2 for generating musical tone waveform information based on the detected operation information.
2, a control means 23 for controlling these, and a MIDI for inputting / outputting operation information of the keyboard device 3, timbre information of musical tones, and the like.
(Musical Instrument Digital Interface) and the like.

An electronic keyboard device as a peripheral device or an operation terminal, such as a sound source device or a composition or arranging support device utilizing a personal computer, simplifies or omits the tone generator device 22 in an electronic keyboard instrument, and The transmission of operation information is an essential function.

By the way, in a keyboard device for musical instruments,
There is a tendency that a key with a good key touch feeling is demanded. In particular, in an electronic piano, efforts are being made to make it as close as possible to an acoustic piano. However, it is difficult to realize at low cost an apparatus such as an acoustic piano that can obtain a key touch sensation in which the key pressing force gradually decreases from a low pitch to a high pitch.

FIG. 12 is a sectional view of a keyboard device of an electronic keyboard instrument. The white key 31 and the black key 32 have their rear ends rotatably supported on a chassis 33 via bearings 34, and the other ends swing in the vertical direction about the bearings 34 in order of pitch. They are arranged side by side.

Below the white key 31 and the black key 32, a hammer 35 of sufficient mass rotatably supported by a bearing member 36 is mounted on the chassis 33 in the order of pitch. 32 are arranged on the chassis 33 so as to correspond to each of them.

[0008] The hammer 35 is composed of a rotating support 35-1 formed of resin or the like and a mass body 35-2 having an enlarged tip portion for efficiently obtaining a rotational moment and an inertia moment due to the action of gravity. It is formed integrally by molding. The rotation support portion 3 of the hammer 35
The pressure receiving portion 35-3 formed in a part of the 5-1 is positioned so as to oppose the lower portions of the white key 31 and the black key 33. 35 is rotated in the anti-gravity direction. The hammer 35, which is rotated by pressing the key, detects the state of the keyboard playing operation mounted on the circuit board 38 attached to the chassis 33 by the pressure applying section 35-4 formed on a part of the rotating support section 35-1. The rubber switch 37 is pushed and contracted to operate. At the time of key release, the white key 31 and the black key 32 are returned by the return force due to the rotational moment due to the gravitational action of the hammer 35 and the restoring force of the rubber switch 37 which is pressed and contracted.

Therefore, the pressing force of the keys 31 and 32 is determined by the return force generated by the rotational moment due to the gravitational action of the hammer 35 and the compression resistance (restoring force) of the rubber switch 37-1.

The mass body 35-2 of the hammer 35 is
The moment of inertia gives the player a sufficient texture to the fingertips of the player, and acts so as to obtain a key touch feeling close to that of an acoustic piano.

[0011]

However, in such a conventional keyboard device, a device close to the key touch feeling of an acoustic piano can be obtained, but the number of masses 35-2 of the hammer 35 is increased. It is difficult to realize, at low cost, a key touch feeling with a fine grain that changes such that the pressing force and texture of the keys gradually decrease in the order of pitches, as in an acoustic piano. That is, increasing the number of types of the hammers 35 causes an increase in the price. Therefore, since the shape of each hammer 35 for each key is made the same and the price is reduced, the rotational moment and the moment of inertia become the same. Therefore, the key touch feeling of fine wood grain like an acoustic piano cannot be obtained.

An object of the present invention is to provide a keyboard device and an electronic musical instrument capable of producing a key touch feeling with a fine grain of wood at low cost.

Specifically, it is an object of the present invention to provide an inexpensive means capable of finely changing the pressing force and texture of a key in the order of pitch, similar to an acoustic piano.

[0014]

SUMMARY OF THE INVENTION According to the present invention, there are provided a plurality of keys which are arranged in the order of pitch while supporting a rear end thereof so that the front end thereof can freely swing, and swingable below each of the keys. A plurality of hammers that are supported and abut against the lower part of each key so as to oscillate about a fulcrum when the key is depressed, and detection means for detecting a state of the key performance operation. Keyboard device that outputs key performance operation information according to
Each of the above-mentioned hammers is provided with a rotation support portion and a mass body portion, and each of a plurality of types of the mass body portions having the same outer shape formed by sheet metal press molding and having different sizes of holes provided at the distal end portion. In the resin molding of the rotation support portion, the rotation support portion is formed integrally with the rotation support portion, and a hammer having a large hole is sequentially arranged from a hammer having a large hole in a pitch order, so that different types of hammers can be formed. The arrangement is realized at low cost.

[0015] More specifically, in the hammer, the turning support portion and the mass body portion are integrally formed by outsert molding.

Further, the plurality of types of hammers having different hole sizes are arranged in different types in a predetermined range in order of pitch.

The detecting means for detecting the key playing operation state includes a flexible rubber switch, and rubber switches having different compression resistances are arranged in a predetermined range in pitch order.

The rubber switch changes color every time the compression resistance is different.

By combining such a keyboard device with a sound source device for outputting musical sound waveform information reflecting key performance operation information output from the keyboard device,
Construct an electronic musical instrument.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of an electronic keyboard instrument according to the present invention will be described with reference to the drawings. Constituent elements common to the above-described conventional electronic keyboard instruments are denoted by the same reference numerals, and detailed description thereof will be omitted, or illustration will be omitted.

FIG. 1 is a side view of a keyboard device in an electronic keyboard instrument according to the present invention. FIG. 2 is a side view of the keyboard device with a part thereof cut away. White key 31 and black key 32
The rear end is rotatably supported on a chassis 33 by a bearing 34, and the other end is arranged in order of pitch so that the other end swings up and down around the bearing 34 as a fulcrum. Below the white key 31 and the black key 32, a hammer 35 having a sufficient mass is rotatably supported by a chassis 33 by a bearing member 36, and the hammer 35 is provided on the white key 31 and the black key 32 arranged in the pitch order. Are facing each other.

The hammer 35 is formed by outsert molding a rotating support portion 35-1 formed of a resin or the like and a mass body 35-2 having an enlarged tip portion in order to obtain a rotational moment and an inertia moment due to the action of gravity. It is formed integrally. The hammer 35 is rotatably supported by a chassis 33 by a bearing member 36, and furthermore, a pressure receiving portion 35-3 formed in a part thereof is brought into a substantially horizontal state by abutting against the lower portions of the white key 31 and the black key 32. It is held, and is rotated in the anti-gravity direction by being pressed by the white key 31 and the black key 32 when the key is pressed.

The mass body 35-2 of each hammer 35 has a structure in which the outer shape is processed by sheet metal press forming to have the same outer shape, and a weight adjusting hole 35-5 is provided at the enlarged end. The weight adjusting hole 35-5 is formed in a size corresponding to the position where the hammer 35 is provided. In other words, the weight adjusting hole 35-5 of the hammer 35 disposed on the bass side is sequentially reduced correspondingly to the white key 31 and the black key 32 disposed in the pitch order (the weight is increased, and the rotational moment is increased). And the moment of inertia is increased), and the weight adjusting hole 35-5 of the hammer 35 disposed on the treble side is increased (the weight is reduced, and the rotational moment and the inertia moment are reduced). It is practical to change the size of the weight adjustment hole 35-5 in steps of one octave or two octaves.

The hammer 35 rotated by being pressed down by the white key 31 and the black key 32 is operated by an operation portion 35-4 of the hammer 35, and a rubber switch as a performance operation information detection switch provided on a circuit board 38 attached to the chassis 33. 37
Press to operate. This rubber switch 37
The compression resistance and the restoring force due to being compressed by the operating portion 35-4 of the hammer 35 are reduced by the operating portion 35- of the hammer 35.
4 as a reaction force.

Therefore, the pressing force and the texture of the keys 31 and 32 are determined by the rotational moment and the inertia moment due to the gravitational action of the hammer 35 and the compression resistance and the restoring force of the rubber switch 37. Then, the white key 1 and the black key 32 arranged in the pitch order have a touch feeling that gradually changes from the low tone side to the high tone side.

FIG. 3 shows a change characteristic of the key pressing force when the weight (weight adjustment hole 35-5) of the mass body 35-2 of the hammer 35 is changed in the order of pitch. In this embodiment, the key depressing force against the rotational moment of the hammer 35 is about 50 gf to 30 gf, and the rubber switch 37
Approximately 15g of key depressing force against compression resistance and restoring force
f, The equivalent mass at the moment of inertia of the hammer 35 that gives the texture is about 190 g to 115 g.

Next, the mass body 35-2 of the hammer 35 will be described with reference to FIG.

Each mass body 35-2 of the hammer 35 is
Formed into the same outer shape by sheet metal pressing. This external processing can be performed by one type of mold. Then, a weight adjusting hole 35- having a different size is formed in the enlarged tip portion.
Change the weight by forming 5. The weight adjustment holes 35-5 having different sizes are realized by changing a mold (punch).

FIG. 5 shows four types of hammers 3 having different weights.
5 is a characteristic diagram of a key pressing force of a keyboard in which a key pressing force is changed by 5; FIG. In this example, the whole interval is divided into four regions, and the hammer 35 facing the keys 31 and 32 in the lower range uses a heavier mass body 35-2, and sequentially moves toward the higher range. , The characteristics when the light mass body 35-2 is used.

FIG. 6 shows a forming method for economically forming the mass body 35-2 of the hammer 35. This forming method is a method of forming a plurality of types of mass bodies 35-2 by forming weight adjusting holes 35-5 having different sizes using a progressive die. Dice 5
0 is the largest weight adjustment hole 35-5 from the punched hole 51-1 for processing the smallest weight adjustment hole 35-5.
And a contour punching hole 52 for machining the contour. The distance between the punched holes is the feed pitch of the sheet metal material 53. And
When forming the mass body 35-2 having the weight adjusting hole 35-5, a punch forming a pair with the punching hole 51- corresponding to the weight adjusting hole 35-5 and a punch forming a pair with the outer shape punching hole 52 are set. Then, punching is performed with other punches removed.

If the sheet metal material 53 is punched without using a punch for punching the weight adjusting hole 35-5, a mass body 35-2 without the weight adjusting hole 35-5 can be obtained.

Since the plurality of types of mass bodies 35-2 punched out in this way have the same outer shape, as shown in FIG. -2, the rotation support portion 35-1 can be accurately outsert-molded with a resin by sandwiching the longitudinal end of the rotation support portion 35-1.

By using a plurality of types of rubber switches 37 having different compression resistance and restoring force, the key pressing force can be changed finely. For example, as shown in FIG. 8, a step (about 7 g) between regions of the key pressing force due to the rotation moment of the hammer 35.
By using two types of rubber switches 37 having a compression resistance force (15 gf and 12 gf) with a step (difference) of about half of f), by using these two types of rubber switches 37 in one area, It is possible to increase the fineness (the number of stages) of the grain of the change in the key pressing force. Although it is difficult to change the texture by changing the compression resistance and the restoring force of the rubber switch 37, the change can be felt by a weak touch of mf (mesoforte) or less.

As shown in FIG. 9, the rubber switch 37 has two conductive portions 37-2 and 37-3 provided at different levels inside a rubber elastic dome portion 37-1 as electrical contacts of the circuit board 38. The electric contacts are closed by opposing each other and pressing the pressing portion 37-4 to buckle the elastic dome portion 37-1. Therefore, the compression resistance and the restoring force can be changed by changing the hardness of the material (rubber) or the degree of curvature or the thickness of the elastic dome portion.

The plurality of types of rubber switches 37 having different compression resistance and restoring force are color-coded so that visual judgment can be effectively used for component management and identification during assembly work.

[0036]

According to the present invention, the mass of the hammer is formed into the same outer shape by sheet metal press forming, and the size of the hole at the end is changed to change the weight so that the sense is different. Therefore, it is possible to inexpensively create a key touch feeling with a fine grain of wood.

Further, by changing the compression resistance of the rubber switch for detecting the key playing operation state, it is possible to realize a more detailed key touch feeling.

[Brief description of the drawings]

FIG. 1 is a side view of a keyboard device of an electronic keyboard instrument according to the present invention.

FIG. 2 is a partially cutaway side view of the keyboard device of the electronic keyboard instrument according to the present invention.

FIG. 3 is a characteristic diagram of a key pressing force in the keyboard device.

FIG. 4 is a side view of a mass body of a plurality of types of hammers having different weights in the keyboard device of the electronic keyboard instrument according to the present invention.

FIG. 5 is a characteristic diagram of key depression force by four types of hammers in the keyboard device of the electronic keyboard instrument according to the present invention.

FIG. 6 is a process chart of forming a mass body of a plurality of types of hammers having different weights in the keyboard device of the electronic keyboard instrument according to the present invention.

FIG. 7 is an outsert molding diagram of a plurality of types of hammers having different weights in the keyboard device of the electronic keyboard instrument according to the present invention.

FIG. 8 is a characteristic diagram of a key pressing force by four types of hammers and two types of rubber switches in the keyboard device of the electronic keyboard instrument according to the present invention.

FIG. 9 is a vertical sectional side view of a rubber switch in the keyboard device of the electronic keyboard instrument according to the present invention.

FIG. 10 is a perspective view showing a part of a general electronic keyboard instrument cut away.

FIG. 11 is an electrical functional block diagram of a general electronic keyboard instrument.

FIG. 12 is a cross-sectional view of a keyboard device in a conventional general electronic keyboard instrument.

[Explanation of symbols]

31 white key, 32 black key, 33 chassis, 35 hammer, 35-1 rotating support, 35-2 mass body, 3
7 ... Rubber switch.

Claims (6)

[Claims] 1. A plurality of keys which are arranged in the order of pitch by supporting a rear end so that a front end thereof can swing freely, and are supported swingably below each key, and are provided below each key. A plurality of hammers which are in contact with each other to swing around a fulcrum by depressing the key, and detecting means for detecting a state of the key playing operation; In the keyboard device that outputs, each of the hammers includes a rotation support portion and a mass body portion, and has a plurality of types of the same having the same outer shape formed by sheet metal press molding and having different sizes of holes provided at the distal end portion. Each of the mass portions is integrally formed with the rotary support portion in the resin molding of the rotary support portion, and a hammer having a small hole and a hammer having a large hole are sequentially arranged in order of pitch. Keyboard device. 2. The keyboard device according to claim 1, wherein said hammer has a rotary support portion and a mass portion integrally formed by outsert molding. 3. The keyboard device according to claim 1, wherein the plurality of types of hammers having different hole sizes are arranged in different types in a predetermined range in order of pitch. 4. A key detecting device according to claim 1, wherein said detecting means for detecting a key playing operation state comprises a flexible rubber switch, and a rubber switch having a different compression resistance for each predetermined range in pitch order. A keyboard device, which is provided. 5. The keyboard device according to claim 4, wherein the rubber switch changes color each time the compression resistance differs. 6. A keyboard device according to claim 1, further comprising a tone generator for outputting musical tone waveform information reflecting key playing operation information output from said keyboard device. Electronic musical instrument.