JP3303886B2 - Keyboard instrument - 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 instrument and, more particularly, to driving a soundboard based on vibration data of a string or the like corresponding to a motion state of a striking mechanism to generate sound and to prevent a struck body struck by a hammer. By providing an elastic body having a spring characteristic similar to a string on the surface to be struck, and further detecting the striking force with a pressure sensor, the acoustic piano A lightweight and compact keyboard instrument having a volume variable function and the like without impairing the key touch feeling and tone.

[0002]

2. Description of the Related Art Conventionally, as a technique capable of producing both an acoustic piano sound and an electronic musical sound, for example, Japanese Unexamined Patent Publication No.
A "keyboard instrument" disclosed in Japanese Patent Application Laid-Open No. 1-289393 is known. That is, this keyboard instrument includes both mechanically generating means such as a string striking mechanism and electronically generating musical sounds. Then, these means are switched to generate a musical tone.

[0003]

However, in the above-mentioned prior art, the keyboard instrument is provided with the strings and the frame on which the strings are stretched, so that the weight is heavy and the length of the strings is large. Its dimensions are increasing for security. In addition, there is a problem that it is difficult to adjust the volume when an acoustic sound is generated by the mechanical musical sound generating means (the volume cannot be reduced), and there is still room for improvement.

Accordingly, an object of the present invention is to provide a keyboard instrument that is lightweight, small, and capable of adjusting the volume without impairing the key touch feeling and timbre similar to the feel of a string.

[0005]

According to a first aspect of the present invention, there is provided a hitting mechanism for operating a hitting body in response to a key operation to hit an object to be hit, and an operating element for detecting an operation state of the key. a state detecting means, and Could sound generating means in accordance with a detection result of the operator condition detecting means, a keyboard instrument provided with an elastic body and disposed on the striking surface of the struck member, the elastic
The body is a keyboard with different elastic characteristics depending on the range of the key
Musical instrument.

According to a second aspect of the present invention, the elastic characteristic
Is the elastic modulus of the elastic body or the thickness of the elastic body.
A keyboard instrument according to item 1. The invention according to claim 3 is
The striking body moves according to the key operation and strikes the struck body
A striking mechanism, an operating element state detecting means for detecting an operation state of the key, a sound generating means for generating sound in accordance with a detection result of the operating element state detecting means, and a hitting surface of the hitting body. a keyboard instrument comprising an elastic body, the struck surface of the elastic member is a keyboard instrument irregularities are formed. According to a fourth aspect of the present invention, there is provided a hitting mechanism for operating a hitting body in response to an operation of a key to hit an object to be hit, an operating state detecting means for detecting an operating state of the key, and an operating state of the operating element. A keyboard instrument comprising: a sounding means for generating sound in accordance with a detection result of the detecting means; and an elastic body disposed on the hitting surface of the hitting body.
Wherein the hitting body of the elastic body has a surface opposite to the hitting surface.
This is a keyboard instrument provided with a space on the side for the elastic body to cut into . According to a fifth aspect of the present invention, the dimension of the space is reduced.
5. The keyboard instrument according to claim 4, wherein the keyboard instrument is made different depending on the range of the key.
It is. The invention according to claim 6 is the keyboard instrument according to any one of claims 1 to 5 , further comprising a striking force detecting means for detecting a striking force applied by the striking body to the struck body, and wherein the sounding means includes This is a keyboard musical instrument that emits sound in accordance with each detection result of the striking force detection means and the operation element state detection means.

[0007]

In the keyboard musical instrument according to the first aspect of the present invention, an elastic body exhibiting a spring characteristic similar to the movement of a string of various lengths and thicknesses is provided on the hitting surface of the hitting body. I have. Then, the operation state of the key is detected, and a sound corresponding to the detection result is output. At that time, the elastic characteristics of the elastic body differ depending on the key range. As a result, it is possible to obtain a key touch feeling similar to a string striking sensation on an acoustic piano, and to perform while maintaining the timbre of the acoustic piano. Further, the sound generation from the hit body can be reduced. Furthermore, members such as a string and a frame supporting the string can be eliminated,
The keyboard instrument itself can be reduced in size and weight.

According to the second aspect of the present invention, since the elastic coefficient of the elastic body or the thickness of the elastic body is changed in accordance with the sound range, the key touch feeling is closer to the feel of striking an acoustic piano. Become. Further, according to the third to fifth aspects of the present invention, the operation state of the key is detected, and a sound corresponding to the detection result is output. At this time, since the surface to be struck has irregularities and a space is provided on the opposite side of the surface to be struck, it is possible to further reduce the generation of noise at the time of striking as compared with a flat surface. In addition, the key touch feeling is closer to the feeling of striking the strings of an acoustic piano.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a keyboard instrument according to the present invention will be described below with reference to the drawings. FIGS. 1 to 31 are views for explaining one embodiment of the present invention. FIG. 1 is a partially broken sectional view showing a schematic configuration of a keyboard instrument according to an embodiment of the present invention. FIG. 2 is a block diagram showing an electronic control circuit according to one embodiment. 3 to 31 are views showing various modified examples of the hit body unit.

In these figures, reference numeral 11 denotes a key constituting a keyboard, for example, 88 keys. Each key 1
1 is supported on a shelf plate 12 so as to be vertically swingable with a reed 13 as a fulcrum. In addition, an action (hitting mechanism) 21 is disposed above the rear end of each key 11.

The action 21 has a well-known structure as a striking mechanism (string striking mechanism) for a grand piano. A support pushed up by a capstan screw provided on the upper surface of the rear end of the key 11 serves as a jack. When the jack is raised, the jack is pushed up and the hammer 25 rotates clockwise in the drawing to hit the hit body unit 31.

The hit body unit 31 includes a hammer 25.
Are disposed at a predetermined interval above the upper part. Then, a pressure sensor is attached to the contact surface of the hammer 25 of the hit body unit 31. The pressure sensor detects the impact force of the hammer 25.

A reflection type optical sensor is provided opposite to the hammer shank 25a which rotates together with the hammer 25, and detects the rotation speed of the hammer 25. Further, below each of the keys 11, a key sensor for detecting the pressed key 11 and its descending speed is provided. These key sensors are composed of reflected light type optical sensors (for example, LEDs and phototransistors). A key impact force sensor (acceleration pickup) is provided above the intermediate portion of the key 11.

In this keyboard instrument, a sound board 42 is mounted on a frame and horizontally supported. A sound board driving actuator 43 is provided at a predetermined position on the lower surface of the sound board 42.
Is attached. This soundboard drive actuator 4
Reference numeral 3 denotes an electromagnetically driven unit that vibrates the sound board 42 at a predetermined frequency. The soundboard 42 and the soundboard drive actuator 43 constitute sounding means in the keyboard musical instrument according to the present invention.

Further, this keyboard instrument has three pedals (not shown), and a displacement sensor for detecting the swing of each pedal.
, Are arranged. The displacement sensor is for a damper pedal, the displacement sensor is for a shift pedal, and the displacement sensor is for a sostenuto pedal.

In this keyboard musical instrument, a predetermined calculation is performed based on input signals from the above-mentioned sensors (where,... Constitute an operating element state detecting means, and a striking force detecting means). An electronic control circuit 51 that performs processing and controls and drives the soundboard drive actuator 43 is provided. In FIG. 1, reference numeral 52 denotes the power supply.

As shown in FIG. 2, the electronic control circuit 51 includes a CPU 53 and a RO connected via a system bus.
An M54, a RAM 55, and an input / output unit 56 are provided. The input / output unit 56 includes, for example, an A / D converter, a D / A converter,
It is configured to include a multiplexer and the like. Further, a backup RAM 57 is connected to the CPU 53 and the like via a system bus. Reference numeral 58 denotes a clock circuit (clock generator) which converts a clock signal into a clock signal.
It is supplied to PU53. 59 is a backup RAM 5
7 battery.

Further, in FIG. 2, reference numeral 61 denotes a key speed detecting circuit for calculating a key speed based on the detection signal of the key sensor, 62 denotes an audio output terminal, and 63 denotes a MIDI output terminal. Therefore, the electronic control circuit 5
The key number of the key 11 pressed from the key sensor and the key speed from the key speed detection circuit 61 are input to the input / output unit 56 of the first unit.

The input / output section 56 receives the hammer striking force from the pressure sensor and the key acceleration from the key impact force sensor via a high cut filter 64. For example, the vibration of the pressure sensor struck by the hammer 25 that rotates in response to the key depression is detected by the piezoelectric element, and the vibration signal is transmitted to the high-cut filter 6.
In 4, the high frequency component of, for example, 8000 [Hz] or more is gradually cut as noise. The vibration signal after the noise removal is input to the input / output unit 56 of the electronic control circuit 51. In the input / output unit 56, the vibration signal is converted into a digital signal by an A / D converter and processed.

Further, the input / output unit 56 is provided with a hammer speed detection circuit 65 for detecting the displacement of the hammer output from the optical sensor.
Is input as the hammer speed. The displacement of each pedal 44 is also input from a pedal sensor.

The drive circuit 66 drives the soundboard drive actuator 43 which produces sound by vibrating the soundboard 42 at a predetermined frequency. Electronic control circuit 51
The input / output unit 56 selects and outputs a drive signal to a drive circuit 66, an audio output signal to an audio output terminal 62, and a MIDI signal to a MIDI output terminal 63. As a result, this keyboard instrument has a configuration in which the striking force or the like of the hammer 25 is detected, and can be sounded via the soundboard drive actuator 43 within a predetermined time (for example, 5 msec) after the key is pressed. .

Here, the backup RAM 57 stores a string vibration signal based on the line spectrum signal. What is actually stored is a string vibration signal obtained by performing an inverse Fourier transform of the string vibration data. That is, the backup RAM 57 is a storage circuit (constituting vibration state storage means) for storing a line spectrum signal indicating the vibration state of the strings of the acoustic piano corresponding to each key 11, and It has a storage capacity. The backup RAM 57 stores the string vibration signal corresponding to the 88 keys 11 and the three pedals.

In this embodiment, the MIDI output terminal 6
3 can output a MIDI signal, and other electronic musical instruments, MIDI equipment (music computer, etc.)
You can also perform ensemble performances.

Therefore, in this keyboard instrument, a predetermined key touch feeling can be obtained by rotating the hammer 25 via the action 21 by pressing the key of the player, similarly to a normal piano. At the time of the performance, a desired sound is generated from the soundboard 42 as sound generating means based on the line spectrum of the string vibration signal of the acoustic piano at the same time when the key is hit. As a result, it is possible to obtain a tone with a tone and volume similar to or higher than that of an acoustic piano. In this case, since the sound is not generated by the impact of the hammer 25 on the hit body unit 31, the volume of the sound generated by the sound board 42 can be easily adjusted.

Hereinafter, modified examples of the hit body unit 31 and the pressure sensor will be described in detail with reference to FIGS.

The modified examples of FIGS. 3 to 7 show a case where a hit body unit 31 having a constant elastic body in cross section is used. 3 is a perspective view of the hit body unit 31, FIG. 4 is a front view thereof, and FIGS. 5 to 7 are right side views thereof. In the hit body unit 31, as shown in FIG. 3, a band-shaped viscoelastic body 72 made of rubber, felt, or the like is provided on the lower surface of a beam 71 made of wood or the like.
Further, a protective member 73 having a predetermined thickness, for example, artificial leather, cloth, or the like is bonded to the lower surface of the viscoelastic body 72, respectively. In this case, when using the hammer 25 of the grand piano as it is, as shown in FIG.
It is necessary to form a step of m. When using a pseudo hammer, this step is unnecessary (the same applies hereinafter).
The arrow in FIG. 5 indicates that the hammer 25 contacts the lower surface of the hit unit 31 (the same applies hereinafter). The protection member 73 buffers the impact of each hammer 25 and the viscoelastic body 72.
The purpose of this is to improve the durability.

The beam 71 functions to absorb the vibration of each hammer 25 when hit. The elastic body 72 is made of a viscoelastic material that changes the rebound resilience in accordance with the sound range and produces a feeling close to a state in which each hammer 25 hits a string. In detail, among the characteristics of the strings stretched on the piano, among the mass, friction and spring, the influence of the spring characteristics occupies a large part of the feel of striking, so if you consider the rebound resilience, acoustic You will get the same key touch as a piano strike.

The speed ratio of the hammer 25 before and after striking (hammer speed after striking / hammer speed before striking) is, for example, about 20% for the No. 1 key of a grand piano and about 20% for the No. 49 key. It is about 60%, and about No. 85 key is about 60%. The rebound resilience of the elastic body 72 is determined according to the speed ratio. On the other hand, rubber has a rebound resilience of NBR (nitrile butadiene rubber) of 10 to 65%, IIR
(Butyl rubber) 20 to 50%, EPDM (ethylene propylene rubber) 30 to 70%, CR (chloroprene rubber) 40 to 80%, SBR (styrene.
Butadiene rubber) 40-80%, NR (natural rubber) 40-90%, BR (butadiene rubber) 5
0 to 95%. The felt has a rebound resilience substantially similar to that of the above rubber depending on the degree of shrinkage. In consideration of these data, a material corresponding to the range of the piano is selected as the viscoelastic body 72. For example, a material having a large value of rebound resilience is applied to a high tone side, while a material having a small value is applied to a low tone side. As a result, the key touch feeling is closer to the feel of striking the acoustic piano.

When the string is strongly hit with an acoustic piano, the string bends up to 4 to 5 mm. Therefore, as shown in FIG. 6, a recess 71A is provided in the beam 71, and the viscoelastic body 72 slightly bites into the recess 71A. May be configured. The concave portion 71A can be formed so that its size varies depending on the sound range. For example, the bass is deeper and louder than the middle and treble side. Thereby, the key touch feeling becomes closer to the feel of striking the strings of an acoustic piano.

Further, as shown in FIG. 7, the beam 71 may be formed by bending an iron plate 74 and sandwiching a viscoelastic body 75 therebetween. This is because a metal (iron plate) has a high Q and is likely to resonate, so that a viscoelastic body 75 similar to the elastic body 72 is used to prevent the iron plate 74 as the beam 71 from being hit by the hammer 25. It is. Thereby, the hit body unit 31 can be made lighter than the case where the wooden beam 71 is used,
Keyboard instruments can be made lighter.

8 to 9 show a case where a hit body unit 31 of a type in which the cross section of the viscoelastic body changes is used. FIG. 8 is a front view of the hit body unit 31, and FIG. 9 is a right side view thereof. This hit body unit 31
As shown in FIG. 8, a viscoelastic body 77 having a constant rebound resilience is attached to the lower surface of a beam 76 by changing its thickness,
Are fixed to the lower surface of the viscoelastic body 77, respectively. For example, on the bass side, the thickness of the viscoelastic body 77 is increased so that the hammer is unlikely to repel like the bass string, and on the treble side, the viscoelastic body 77 is designed to repel the hammer like the treble string. Reduce the thickness. As a result, the key touch feeling is closer to the feel of striking the acoustic piano. Further, since the viscoelastic body 77 is only one component,
The manufacturing process of the hit unit 31 can be reduced.

The modification shown in FIGS. 10 to 14 is a case in which a projection type hit body unit 31 is used. 10 is a front view of the hit body unit 31, FIG. 11 is a side view thereof, FIG. 12 is an enlarged perspective view of a part thereof, and FIGS. 13 and 14 are perspective views of the hit piece. This hit body unit 3
In FIG. 1, as shown in FIG.
Eight hit pieces 78 are fixed. These 8
The eight hit pieces 78 are arranged so that the respective hammers 25 of the No. 1 key to the No. 88 key can abut. As shown in FIG. 11, the lower surface of
7A are formed in the same manner as in the modified examples of FIGS.

The hitting piece 78 is formed of a viscoelastic material such as rubber, and has a lower surface (hammer hitting surface) formed with two convex portions 78A projecting downward by a predetermined height. . As in the modified example shown in FIGS.
If the surfaces come into contact with each other at the time of the hitting of No. 5, noise is likely to be generated, and therefore, as shown in FIG.
The hitting portion of the hammer 25 is in contact with 8A to prevent noise at the time of hitting. These hit pieces 7
Since the fixing position of 8 is restricted by the position of each hammer 25, the hit pieces 78 are mounted according to the arrangement pitch of the hammers 25. In addition, when using a pseudo hammer with an equal pitch, a plurality of pieces to be hit 78 can be collectively formed, and the manufacturing process can be simplified. Further, by configuring each of the hit pieces 78 with materials corresponding to strings of various lengths and thicknesses, the key touch feeling can be set to a feeling closer to the feel of a string of an acoustic piano. .

The shape of the hit piece is not limited to the above-mentioned two protrusions 78A, but may be a square piece 79, a round piece 80, or the like as shown in FIG. 13 or FIG. Further, the struck pieces may be constituted by small projections smaller than the striking surface of each hammer 25, and these small projections may be arranged on the lower surface of the beam 71 side by side. In this case, since there is no restriction on the arrangement pitch of each hammer 25, N
It is possible to extend the lower surface of the beam 71 without cutting the hit piece corresponding to each of the o.1 to No. 88 keys.

The modified examples of FIGS. 15 to 17 show a case where the hitting unit 31 has a light reflection sensor type pressure sensor. FIG. 15 is a side view of the hit body unit 31. FIG. 16 to FIG.
FIG. 3 is a cross-sectional view of the hit body unit 31 taken along line AA. FIG.
As shown in the figure, 81 is an iron plate provided with a hole in a channel having a U-shaped cross section, and the iron plate 81 has its zinc-plated surface blackened. A protective plate 8 is provided on the lower surface of the horizontal piece of the iron plate 81.
2, a viscoelastic body 83 such as rubber having the same physical properties as a string
Are provided. Note that these viscoelastic bodies 83 are fixed to the iron plate 81 with screws 84 sandwiched between the protection plates 82. The board (PCB) 85 is supported on the upper surface of the horizontal piece of the iron plate 81 via a spring 86. This PC
On the lower surface of B85, a light reflection sensor 8 is used as a pressure sensor.
7 is attached. Opposite to the light reflection sensor 87, a white rubber 88 is fixed to the upper surface of the viscoelastic body 83. Since the rubber forming the viscoelastic body 83 is generally black and has a low light reflectance, a rubber 88 having white flexibility is fixed to the surface facing the light reflection sensor 87.

The hitting unit 31 as a whole absorbs the hitting energy of the hammer 25 when hitting. Hammer 25
When the viscoelastic body 83 is hit by the light, the viscoelastic body 83 is deformed and approaches the light reflection sensor 87, so that a change in the distance is detected by the light reflection sensor 87. Based on the detected value, the output current (voltage) according to the impact stress of the hammer 25
Can be obtained. This output current is input to the input / output unit 56 of the electronic control circuit 51. Therefore, the hammer 25 outputs to the electronic control circuit 51 a signal indicating the same striking state as when struck, and the electronic control circuit 51 calculates the hammer speed and the string striking timing to generate a drive signal. Therefore, the key touch feeling at the time of performance can be the same as that of an acoustic piano, and the tone can be the same as that of an acoustic piano. The shape of the lower surface (hammer contact surface) of the viscoelastic body 83 is shown in FIG.
The lower surface of the viscoelastic body 89 may be formed of two protrusions 89A having a square cross section, as shown in FIG. 17, for example.

The modified examples shown in FIGS. 18 to 22 show a case where a pressure sensor formed of a pressure-sensitive printing sheet is used as the hitting unit 31. FIG. 18 shows the hit body unit 3.
1 is a side view, and FIG.
FIGS. 20 and 21 are front views showing a part of them omitted, and FIGS.
2 is a plan view showing a schematic configuration thereof. As shown in FIG. 18A, a plurality of elastic bodies 90 having the same physical properties as a plurality of chords are fixed to the lower surface of the beam 71, respectively, and as shown in FIG. In this case, substrates 91 having various pressure-sensitive printing patterns are fixed. The conductive plates 92 are fixed to the lower surfaces of the plates 91, respectively. . 19 and 20, a cushion 93 may be further fixed in a band shape so as to cover the conductive plate 92. The cushion 93 is fixed to protect the conductive plate 92 from the impact force of the hammer 25 and to prevent noise at the time of impact.

The hit body unit 31 includes a conductive plate 92.
Is detected by the pressure-sensitive printed circuit board 91 when each hammer 25 strikes, is output as a detection result of the pressure sensor, and each hammer speed and string timing is determined by the electronic control circuit. 51. As a result, when playing, the key touch feeling is the same as that of an acoustic piano, and the timbre can be the same as that of an acoustic piano.

As shown in FIG. 21, a pressure-sensitive printed circuit board 94 may be fixed to the lower surface of the beam 71, and a (flexible) conductive sheet 95 may be fixed to the lower surface of the substrate 94. In this case, the hard rubber 96 is further fixed to the lower surface of the conductive sheet 95, and the elastic bodies 97 having the same physical properties as a plurality of strings are fixed to the lower surface of the hard rubber 96, respectively.
FIG. 22 shows an overall pattern configuration diagram in which a conductive sheet 95, a hard rubber 96, and an elastic body 97 are laminated on a substrate 94. The pressure-sensitive printed board 94 has a plurality of rectangular resistance patterns 95A corresponding to the hammers, and the hard rubber 96 and the elastic body 97 are formed in substantially the same shape of the resistance patterns 95A. As a result, the hit body unit 31 can be made compact.

The modified examples of FIGS. 23 to 27 show a case where a hit body unit 31 including a pressure sensor constituted by a pressure-sensitive rubber is used. 23 is a side view of the hit body unit 31, FIG. 24 is a front view thereof, FIG. 25 is a partially enlarged cross-sectional view thereof, and FIGS. 26 and 27 are views showing a part of the pattern shape. As shown in FIG. 23, the hit body unit 31 has a plurality of metal or conductive plastic plates 98 fixed to the lower surface of the beam 71, and a pressure-sensitive rubber as a pressure sensor is mounted on the lower surface of these plates 98. 99 are fixed to each other. Further, the impact piece 1 made of metal or conductive plastic is provided on the lower surface of the pressure-sensitive rubber 99.
00 are respectively fixed. These pressure-sensitive rubber 99
Is used for after touch of an electronic musical instrument, and its resistance value changes according to pressure.

Also in this case, the hit piece 100
Is detected by the pressure-sensitive rubber 99 when each hammer 25 strikes, and the respective hammer speed and stringing timing are determined by the electronic control circuit 51.
Can be calculated. As a result, when playing, the key touch feeling is the same as that of an acoustic piano, and the timbre can be the same as that of an acoustic piano. Further, as shown in FIG. 25, the upper surface of the hit piece 100 is made convex, and as shown in FIGS. 26 and 27, the electrode pattern of the substrate 94 which is turned on and off by the pressure-sensitive rubber 99 is changed to a comb-like pattern or a spiral pattern. It is also possible to increase the sensitivity as a pressure sensor by forming a shape pattern.

The modification of FIGS. 28 to 31 is a case where the hit body unit 31 is constituted by using a magnet type pressure sensor. FIG. 28 is a side view of the hit body unit 31, FIG. 29 is a view showing the slit, FIG. 30 is a view showing the magnet area, and FIG. 31 is a sectional view of a part thereof. As shown in FIG. 28, the hit body unit 31 has a substrate 102 provided on a lower surface of an iron plate 101 bent in a U-shape. A spacer 103 is provided on the lower surface of the substrate 102.
, A plate 104 made of rubber, rubber, or a spring rope is fixed with a washer 105 and a screw 106. A coil pattern 108 is formed as a pressure sensor on the lower surface of the substrate 102, and a plastic or rubber magnet 107 is fixed to the upper surface of the plate 104 so as to face the coil pattern 108. The iron plate 101 is provided for lining (backing) against hammering.

The distance between the magnet 107 and the substrate 102 changes due to the elastic deformation of the plate 104 from the impact of each hammer 25, and a voltage is induced in the coil pattern 108. This voltage is output to the electronic control circuit 51 as a striking force of each hammer 25, and the electronic control circuit 51 can calculate each hammer speed and string striking timing. As a result, when playing, the key touch feeling is the same as that of an acoustic piano, and the timbre can be the same as that of an acoustic piano.

By providing slits between adjacent magnets 107 on the plate 104 as shown in FIG. 29, the plate 104 can be easily deformed and the sensitivity as a pressure sensor can be improved. Further, the influence on adjacent sensors can be minimized. Also, the magnet area may be set within the width of the coil pattern 108.
Then, as shown in FIG.
These coil patterns 108 are preferably arranged so as to suppress the influence between the coils 08 and to effectively use the leakage magnetic flux. N and S represent magnetic poles. Further, as shown in FIG. 31, the rubber plate 10
9 is fixed, a rubber magnet layer 110 is formed on the lower surface thereof, and a rubber hit piece 111 is further fixed on the lower surface of the magnet layer 110 to prevent noise when the hammer 25 is hit. Good.

[0045]

As described above, according to the keyboard instrument of the present invention, the strings and the frames attached to the strings can be eliminated, and the keyboard instrument can be reduced in size and weight. In addition, since the striking by the striking mechanism is directly detected, the key touch feeling during the performance is the same as the striking sensation of the acoustic piano, and the timbre thereof is also the same as that of the acoustic piano. Furthermore, the hitting unit does not generate sound due to the impact, and the volume control by the sounding means is facilitated.

[Brief description of the drawings]

FIG. 1 is a partially broken sectional view showing a schematic configuration of a keyboard instrument according to an embodiment of the present invention.

FIG. 2 is a block diagram showing an electronic control circuit of the keyboard instrument according to one embodiment of the present invention.

FIG. 3 is a perspective view of a hit body unit of the keyboard instrument according to one embodiment of the present invention.

FIG. 4 is a front view of a hit body unit of the keyboard instrument according to one embodiment of the present invention.

FIG. 5 is a side view of a hit body unit of the keyboard instrument according to one embodiment of the present invention.

FIG. 6 is a side view of a hit body unit of the keyboard instrument according to one embodiment of the present invention.

FIG. 7 is a side view of a hit body unit of the keyboard instrument according to one embodiment of the present invention.

FIG. 8 is a front view of a hit body unit of the keyboard instrument according to one embodiment of the present invention.

FIG. 9 is a side view of a hit body unit of the keyboard instrument according to one embodiment of the present invention.

FIG. 10 is a front view of a hit body unit of the keyboard instrument according to one embodiment of the present invention.

FIG. 11 is a side view of a hit body unit of the keyboard instrument according to one embodiment of the present invention.

FIG. 12 is a partially enlarged perspective view of a hit body unit of the keyboard instrument according to one embodiment of the present invention.

FIG. 13 is a perspective view of a hit piece of the keyboard instrument according to one embodiment of the present invention.

FIG. 14 is a perspective view of a hit piece of the keyboard instrument according to one embodiment of the present invention.

FIG. 15 is a side view of a hit body unit of the keyboard instrument according to one embodiment of the present invention.

16 is a sectional view taken along line AA of FIG.

17 is a cross-sectional view taken along the line AA of FIG. 15 and shows a different piece to be struck from FIG. 16;

FIG. 18 is a side view of a hit body unit of the keyboard instrument according to one embodiment of the present invention.

FIG. 19 is a side view of a hit body unit of the keyboard instrument according to one embodiment of the present invention.

FIG. 20 is a front view of a hit body unit of the keyboard instrument according to one embodiment of the present invention.

FIG. 21 is a front view of a hit body unit of the keyboard instrument according to one embodiment of the present invention.

FIG. 22 is a plan view showing a schematic configuration of a hit body unit of the keyboard instrument according to one embodiment of the present invention.

FIG. 23 is a side view of a hit body unit of the keyboard instrument according to one embodiment of the present invention.

FIG. 24 is a front view of a hit body unit of the keyboard instrument according to one embodiment of the present invention.

FIG. 25 is a partially enlarged cross-sectional view of a hit body unit of the keyboard instrument according to one embodiment of the present invention.

FIG. 26 is a diagram illustrating a pattern shape of a resistor of a keyboard instrument according to an embodiment of the present invention.

FIG. 27 is a diagram illustrating a pattern shape of a resistor of a keyboard instrument according to an embodiment of the present invention.

FIG. 28 is a side view of a hit body unit of the keyboard instrument according to one embodiment of the present invention.

FIG. 29 is a diagram illustrating a slit of a hit body unit of the keyboard instrument according to one embodiment of the present invention.

FIG. 30 is a diagram illustrating a magnet area of a keyboard instrument according to an embodiment of the present invention.

FIG. 31 is a partial cross-sectional view of a hit body unit of the keyboard instrument according to one embodiment of the present invention.

[Explanation of symbols]

11 key (operator), 21 action (hitting mechanism), 25 hammer (hitting body), 31 hit body unit (vibration-absorbing means, viscoelastic body), 42 soundboard (sounding means), 43 soundboard driving actuator ( Sounding means), 51 electronic control circuit, 53 CPU (selecting means), 55 RAM, 56 input / output unit, 57 backup RAM (vibration state storing means), 66 drive circuit (sounding means), 72 viscoelastic body, ...
Sensor (operator state detecting means), Pressure sensor (hitting force detecting means)

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-62-208094 (JP, A) JP-A-62-208092 (JP, A) JP-A-1-169494 (JP, A) JP-A-63-209 125995 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G10H 1/34 G10B 3/12 G10C 3/16-3/18

Claims (6)

(57) [Claims] 1. A striking mechanism for striking a struck body by operating a striking body in response to a key operation, an operating state detecting means for detecting an operating state of the key, and detecting the operating state detecting means. A keyboard musical instrument comprising a sounding means for generating sound in accordance with a result, and an elastic body disposed on the hit surface of the hit body , wherein the elastic body has an elastic characteristic according to a range of a key. If different
A keyboard instrument characterized by having 2. The elastic characteristic according to claim 1 , wherein the elastic coefficient is an elastic coefficient of the elastic body.
The thickness of the elastic body is the thickness of the elastic body.
Keyboard instrument. 3. A striking mechanism for operating a striking body in response to an operation of a key to strike an object to be struck, an operating state detecting means for detecting an operating state of the key, and a detecting operation of the operating state detecting means. and Could sound generating means according to a result, a keyboard instrument provided with an elastic member disposed to be striking surface of the struck member, the struck surface of the elastic body are irregularities formed A keyboard instrument characterized by that: 4. A striking mechanism for striking a struck body by operating a striking body in response to an operation of a key, an operating state detecting means for detecting an operating state of the key, and detecting the operating state detecting means. and Could sound generating means according to a result, a keyboard instrument provided with an elastic body and disposed on the striking surface of the struck member, on the opposite side of the surface on which the striking bodies of the elastic body strikes ,the above
A keyboard instrument having a space for an elastic body to cut into. 5. The size of the space is different depending on the range of the key.
The keyboard instrument according to claim 4, wherein 6. The keyboard musical instrument according to claim 1 to 5, further comprising a hitting force detecting means for the striking bodies to detect striking force applied to the struck member, said sound generating means, said striking force detecting means And a keyboard musical instrument which sounds in accordance with each detection result of the operation element state detecting means.