JPH0580763A - Keyboard musical instrument - Google Patents

Abstract

PURPOSE:To provide the lightweight, small-sized keyboard musical instrument with a sound volume varying function without spoiling the same key touch feeling and timbre with an acoustic piano. CONSTITUTION:An action 21 is arranged above the rear end part of each key 11. The hammer 25 of the action strikes against the viscoelastic body 72 of a struck body unit 31. The viscoelastic body 72 prevents vibration due to the striking of the hammer and a feeling of string striking is obtained. A pressure sensor (3) detects the striking force of the hammer 25. A soundboard driving actuator 43 vibrates a soundboard 42 at a specific frequency. An electronic control circuit 51 performs arithmetic processing according to input signals from sensors (1)-(7) to control and drive the soundboard driving actuator 43. The electronic control circuit 51 controls the driving of the sound board driving actuator according to a stored piano string vibration signal and vibrates the soundboard 42 to generate a sound.

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 drives a soundboard based on vibration data of a string or the like corresponding to a motion state of a string striking mechanism to generate a sound, and a hit object to be hit by a hammer. An acoustic piano is constructed by arranging an elastic body having a vibration-proof member and having a spring characteristic similar to a string on the surface to be hit, and further detecting the hitting force with a pressure sensor. It realizes a lightweight and compact keyboard musical instrument having a volume varying function and the like without impairing the touch feeling and tone of the.

[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 Patent Laid-Open No.
The "keyboard musical instrument" disclosed in the 1-289393 publication is known. That is, this keyboard instrument is provided with both means for mechanically generating a musical tone, such as a string striking mechanism, and means for electronically generating a musical tone. Then, these means are switched to generate a musical sound.

[0003]

However, in the above-mentioned prior art, since the keyboard instrument is provided with the strings and the frame in which the strings are stretched as they are, the weight thereof is heavy and the string length thereof is long. The size is increased to secure it. In addition, there is a problem that it is difficult to adjust the volume when the acoustic sound is generated by the mechanical sound generating means (the volume cannot be reduced), and there is still room for improvement.

Therefore, an object of the present invention is to provide a keyboard instrument which is lightweight, compact, and whose volume can be adjusted without impairing the key touch feeling, tone color and the like similar to the string striking feeling.

[0005]

According to a first aspect of the present invention, a striking mechanism for striking a striking body by operating a striking body in response to a keystroke and at least a motion state of the striking mechanism are detected. Manipulator state detection means, vibration state storage means for storing the vibration state of a member of an acoustic piano including at least strings, and vibrations stored in the vibration state storage means according to the detection result of the manipulator state detection means. Selection means for selecting a state, sounding means for converting the selected vibration state into sound and outputting it, vibration damping means for absorbing impact energy to the impacted body, and impact surface of the impacted body And a viscoelastic body disposed on the keyboard instrument.

Further, the invention according to claim 2 is a string striking mechanism in which a striking body operates in response to a keystroke and strikes a striking body,
An operator state detection means for detecting at least the movement state of the string striking mechanism, and a vibration state storage means for storing the vibration state of a member of the acoustic piano including at least the strings,
Selection means for selecting a vibration state stored in the vibration state storage means according to a detection result of the manipulator state detection means; sound generation means for converting the selected vibration state into sound and outputting the sound. Anti-vibration means for absorbing impact energy to the impacted body, viscoelastic body disposed on the impacted surface of the impacted body, and impact force for detecting impact force applied to the impacted body by the impacted body A keyboard instrument including a detection means.

[0007]

In the keyboard musical instrument according to the first aspect of the present invention, the struck body is constituted by vibration-proof means, and the struck surface is approximated to the movement of a string of various lengths and thicknesses. An elastic body having a spring characteristic is arranged. Then, at least the motion state of the string striking mechanism is detected, at least the vibration state of the strings of the acoustic piano is selected in accordance with the detection result, and this vibration state is converted into sound and output. As a result, it is possible to obtain a key touch feeling similar to the string striking feeling of an acoustic piano, and it is possible to perform while maintaining the tone color of the acoustic piano. In addition, it is possible to reduce the sound output from the hit body,
The volume adjustment and the like can be easily performed. Further, the strings and members supporting the strings such as the frame can be eliminated, and the keyboard instrument itself can be made smaller and lighter.

In the keyboard musical instrument according to the second aspect of the present invention, the struck body is constituted by a vibration-proof means, and the struck surface has movements of strings of various lengths and thicknesses. An elastic body having a spring characteristic similar to the above is arranged. Then, at least the motion state of the string striking mechanism is detected, and
Accurately detect the impact force of the impact body. Corresponding to this detection result, at least the vibration state of the strings of the acoustic piano is selected, and this vibration state is converted into sound and output. As a result, it is possible to perform in a state where the struck body does not sound, the key touch feeling similar to the string striking feeling is not impaired, and the tone color of the acoustic piano is sufficiently retained. In addition, the volume can be adjusted. Further, the strings and members supporting the strings such as the frame can be eliminated, and the keyboard instrument itself can be made smaller and lighter.

[0009]

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

In these figures, reference numeral 11 designates a key constituting a keyboard, which is constituted by 88 keys, for example. Each key 1
1 is supported on a shelf plate 12 so as to be vertically swingable with a reed center 13 as a fulcrum. An action (string striking mechanism) 21 is arranged above the rear end of each key 11.

This action 21 has a known structure as a string striking mechanism for a grand piano, and when a support pushed up by a capstan screw standing on the upper surface of the rear end of the key 11 raises the jack, The hammer 25 is pushed up by the jack and rotates in the clockwise direction in the figure to strike the hit object unit 31.

This hit object unit 31 is a hammer 25.
Are disposed at a predetermined distance above. A pressure sensor is attached to the hammer 25 contact surface of the hit body unit 31. This pressure sensor detects the impact force of the hammer 25.

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

Further, in this keyboard instrument, the soundboard 42 is horizontally supported by being attached to the frame. At a predetermined position on the lower surface of the soundboard 42, a soundboard drive actuator 43 is placed.
Is attached. This soundboard drive actuator 4
Reference numeral 3 is electromagnetically driven to vibrate the soundboard 42 at a predetermined frequency. The soundboard 42 and the soundboard drive actuator 43 constitute sounding means in the keyboard instrument according to the present invention.

Further, this keyboard instrument has three pedals (not shown), and displacement sensors for detecting the swing of each pedal,
, Are provided. 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.

Here, in this keyboard instrument, a predetermined calculation is performed based on the input signal of each of the above-mentioned sensors .about. (,, .. are operating element state detecting means, and is striking force detecting means). It has an electronic control circuit 51 for processing and controlling and driving the soundboard drive actuator 43. Incidentally, reference numeral 52 in FIG. 1 denotes the power source.

As shown in FIG. 2, the electronic control circuit 51 includes a CPU 53 and an RO connected through a system bus.
It has an M54, a RAM 55, and an input / output unit 56. The input / output unit 56 includes, for example, an A / D converter, a D / A converter,
It has a multiplexer and the like. Further, the backup RAM 57 is connected to the CPU 53 and the like by a system bus. Further, reference numeral 58 is a clock circuit (clock generator) which outputs a clock signal to C
It is supplied to the PU 53. 59 is a backup RAM 5
It is a battery for 7.

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

The hammer striking force from the pressure sensor and the key acceleration from the key impact force sensor are input to the input / output unit 56 via the high cut filter 64. For example, the vibration of the pressure sensor that is hit by the hammer 25 that rotates in response to a key press is detected by the piezoelectric element, and this vibration signal is the high cut filter 6
In 4, the high frequency component of 8000 [Hz] or higher 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 this input / output unit 56, the vibration signal is converted into a digital signal by an A / D converter and processed.

Further, the displacement of the hammer output from the optical sensor is input to the input / output unit 56 and the hammer speed detection circuit 65
Has been entered as a hammer speed. The displacement of each pedal 44 is also input from the pedal sensor.

The drive circuit 66 drives the soundboard drive actuator 43 which produces a 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 the drive circuit 66, an audio output signal to the audio output terminal 62, and a MIDI signal to the MIDI output terminal 63. As a result, in this keyboard instrument, the striking force of the hammer 25 or the like can be detected, and a sound can be produced via the soundboard drive actuator 43 within a predetermined time (for example, 5 msec) from the key depression. ..

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 inverse Fourier transforming the string vibration data. That is, the backup RAM 57 is a storage circuit (which constitutes vibration state storage means) for storing the line spectrum signal indicating the vibration state of the strings of the acoustic piano corresponding to each key 11, and has a predetermined value. It has a storage capacity. Further, the string vibration signal is stored in the backup RAM 57 in correspondence with 88 keys 11 and with 3 pedals.

In this embodiment, the MIDI output terminal 6
MIDI signal can be output via 3 and other electronic musical instruments and MIDI equipment (music computer, etc.)
Ensemble performance with etc. is also possible.

Therefore, in this keyboard instrument, the hammer 25 is rotated through the action 21 by the player's key depression, as in a normal piano, and a predetermined key touch feeling is obtained. At the time of playing, simultaneously with this keystroke, a desired sound is produced from the soundboard 42, which is a sounding means, based on the line spectrum relating to the string vibration signal of the acoustic piano. As a result, it is possible to obtain a tone color and volume similar to or higher than that of an acoustic piano. In this case, no sound is produced by hitting the hit object unit 31 with the hammer 25, so that the sound volume of the sound produced by the soundboard 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 shown in FIGS. 3 to 7 are cases in which the struck unit 31 whose elastic body has a constant cross-sectional shape is used. 3 is a perspective view of the struck 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 strip plate-shaped viscoelastic body 72 such as rubber or felt is provided on the lower surface of the beam 71 such as wood.
Further, a protective member 73 having a predetermined thickness, such as artificial leather or cloth, is bonded to the lower surface of the viscoelastic body 72, respectively. In this case, when the hammer 25 of the grand piano is used as it is, as shown in FIG.
It is necessary to form a step of m. In addition, when using a pseudo hammer, this step is not necessary (hereinafter the same).
The arrow in FIG. 5 indicates that the hammer 25 contacts the lower surface of the hit unit 31 (hereinafter the same). The protection member 73 buffers the impact of each hammer 25, and the viscoelastic body 72
To improve the durability of the.

The beams 71 serve to absorb vibrations of the hammers 25 when they are hit. The elastic body 72 is made of a viscoelastic body material that changes the impact resilience according to the musical range and produces a sensation close to that of striking a string with each hammer 25. For details, regarding the characteristics of the strings stretched on the piano, among the mass, friction, and spring, the influence of the spring characteristics occupies most of the string striking feeling, so if you consider the impact resilience, You will be able to obtain the same key touch as a string-striking sensation on a piano.

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

When a string is struck with an acoustic piano, the string flexes 4 to 5 mm at maximum. Therefore, as shown in FIG. 6, a recess 71A is provided in the beam 71 so that the viscoelastic body 72 slightly digs into the recess 71A. You may comprise. The recess 71A can be formed to have different dimensions depending on the sound range. For example, the bass is deeper and louder than the mid-treble side. As a result, the touch feeling of the keys becomes closer to the feeling of striking the strings of the acoustic piano.

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

The modified examples of FIGS. 8 to 9 show the case of using the hit body unit 31 of the type in which the cross section of the viscoelastic body changes. FIG. 8 is a front view of the hit body unit 31, and FIG. 9 is a right side view thereof. This hit object unit 31
As shown in FIG. 8, a viscoelastic body 77 having a constant impact resilience is formed on the lower surface of the beam 76 by changing its thickness, and
Are fixed to the lower surface of the viscoelastic body 77, respectively. For example, on the low tone side, the thickness of the viscoelastic body 77 is increased so that the hammer is less likely to repel like the low tone string, and on the high tone side, the viscoelastic body 77 is set so that the hammer is easily repelled like the high tone string. Reduce the thickness. As a result, the feeling of touching the key becomes even closer to the feeling of hitting a string on an acoustic piano. Furthermore, since the viscoelastic body 77 is a single component,
The manufacturing process of the hit unit 31 can be reduced.

The modified examples shown in FIGS. 10 to 14 are cases in which a projection-type struck body unit 31 is used. FIG. 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 to 14 are perspective views of the hit piece. This hit object unit 3
In FIG. 1, as shown in FIG.
Eight hit pieces 78 are fixed. These eight
The eight hit pieces 78 are arranged so that each of the hammers 25 of No. 1 key to No. 88 key can come into contact with each other. As shown in FIG. 11, the lower surface of the beam 71 is shown in FIG.
7A to 7C, the recess 71A is formed similarly to the modification of FIG.

The hitting piece 78 is made of a viscoelastic body such as rubber, and has a lower surface (hammer hitting surface) formed with two protrusions 78A protruding downward by a predetermined height. .. Hammer 2 as in the modification shown in FIGS.
If the surfaces come into contact with each other at the time of striking 5, the noise is likely to be generated. Therefore, as shown in FIG.
The striking portion of the hammer 25 is brought into contact with 8A to prevent noise when striking. These hit pieces 7
Since the fixing position of 8 is restricted to the position of each hammer 25, the hit pieces 78 are mounted according to the arrangement pitch of the hammers 25. In the case of using the pseudo hammers with evenly arranged pitches, it is possible to form a plurality of hit pieces 78 together and to simplify the manufacturing process. Furthermore, by constructing each of the hit pieces 78 with a material corresponding to strings of various lengths and thicknesses, the key touch feeling can be set to a feeling closer to the string striking feeling of the 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 14. Further, the hit piece may be constituted by small projections smaller than the striking surface of each hammer 25, and these small projections may be arranged in a lot on the lower surface of the beam 71. In this case, there is no restriction on the arrangement pitch of the hammers 25, so N
Corresponding to each of the o.1 to No. 88 keys, the hit piece can be extended to the lower surface of the beam 71 without cutting.

The modified examples of FIGS. 15 to 17 are cases in which the hitting body unit 31 is of a type having a light reflection sensor type pressure sensor. FIG. 15 is a side view of the hit body unit 31. 16 to 17 show
It is the sectional view on the AA line of the hit body unit 31. Figure 15
As shown in FIG. 11, reference numeral 81 is an iron plate having a U-shaped cross-section channel provided with holes. On the lower surface of the horizontal piece of the iron plate 81, the protective plate 8
2 through the viscoelastic body 83 such as rubber having the same physical properties as the string
A plurality of are provided. The viscoelastic body 83 is sandwiched between the protective plates 82, 82 and fixed to the iron plate 81 with screws 84. 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 provided as a pressure sensor.
7 is attached. A white rubber 88 is fixed to the upper surface of the viscoelastic body 83 so as to face the light reflection sensor 87. Since the rubber forming the viscoelastic body 83 is generally black and has a low light reflectance, a rubber 88 having a white flexibility is fixed to the surface facing the light reflection sensor 87.

The striking energy at the time of striking the hammer 25 is absorbed by the entire striking body unit 31. Hammer 25
When the viscoelastic body 83 is hit by the viscoelastic body 83, the viscoelastic body 83 deforms and approaches the light reflection sensor 87, so that the light reflection sensor 87 detects a change in the distance. Based on this 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 a signal indicating the same striking state as when striking the string to the electronic control circuit 51, and the electronic control circuit 51 calculates the hammer speed and the string striking timing to generate a drive signal. Therefore, when playing, the key touch feeling can be the same as the string striking feeling of an acoustic piano, and its tone color 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 as shown in FIG.
17 does not have to be a semicylindrical shape (semicircular cross section), and for example, as shown in FIG. 17, the lower surface of the viscoelastic body 89 may be constituted by two projections 89A having a quadrangular cross section.

The modified examples of FIGS. 18 to 22 are cases in which a pressure sensor formed of a pressure-sensitive printing sheet is used as the struck unit 31. FIG. 18 shows this hit object unit 3
1 is a side view, and FIG. 19 is a side view with a part thereof omitted.
20 and 21 are partially omitted front views,
2 is a plan view showing its schematic configuration. As shown in FIG. 18A, a plurality of elastic bodies 90 exhibiting the same physical properties as a plurality of strings are fixed to the lower surface of the beam 71, and the lower surface of the elastic body 90 is shown in FIG. 18B. The substrates 91 having different pressure-sensitive printing patterns are fixed to each other. Further, conductive plates 92 are fixed to the lower surfaces of the plates 91, respectively. .. Note that, as shown in FIGS. 19 and 20, a cushion 93 may be further fixed in a belt shape so as to cover the conductive plate 92. The cushion 93 is fixed in order to protect the conductive plate 92 from the striking force of the hammer 25 and to prevent noise at the time of striking.

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

As shown in FIG. 21, the pressure-sensitive printed board 94 may be fixed to the lower surface of the beam 71, and the (flexible) conductive sheet 95 may be fixed to the lower surface of the board 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 the plurality of strings are fixed to the lower surface of the hard rubber 96.
Further, 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 hammer, and a hard rubber 96 and an elastic body 97 are formed in substantially the same shape as these resistance patterns 95A. As a result, the hit object unit 31 can be made compact.

The modified examples shown in FIGS. 23 to 27 are cases in which a struck body unit 31 including a pressure sensor made of pressure sensitive rubber is used. 23 is a side view of the struck unit 31, FIG. 24 is a front view thereof, FIG. 25 is a partially enlarged sectional view thereof, and FIGS. 26 and 27 are views showing a part of the pattern shape thereof. As shown in FIG. 23, the struck body unit 31 has a plurality of metal or conductive plastic plates 98 fixed to the lower surfaces of the beams 71, and pressure-sensitive as pressure sensors on the lower surfaces of these plates 98. The rubbers 99 are fixed to each other. Further, the hit piece 1 made of metal or conductive plastic is formed on the lower surface of the pressure-sensitive rubber 99.
00 is fixed. These pressure sensitive rubber 99
Is used for aftertouch of electronic musical instruments, and its resistance value changes according to pressure.

Also in this case, the hit piece 100
The pressure-sensitive rubber 99 detects the impact pressure of each hammer 25 when each hammer 25 strikes, and the respective hammer speeds and string striking timings are determined by the electronic control circuit 51.
Can be calculated. As a result, when playing, the key touch feeling is the same as the string striking feeling of an acoustic piano, and its tone color can be the same as that of an acoustic piano. Further, as shown in FIG. 25, the upper surface of the hit piece 100 has a convex shape, or 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 a comb-shaped pattern or a spiral. The shape of the pattern can be increased to increase the sensitivity of the pressure sensor.

The modified examples of FIGS. 28 to 31 are cases in which the hitting body unit 31 is configured by using a magnet type pressure sensor. 28 is a side view of the hitting body unit 31, FIG. 29 is a view showing a slit thereof, FIG. 30 is a view showing a magnet area thereof, and FIG. 31 is a partial sectional view thereof. As shown in FIG. 28, the hitting body unit 31 has a substrate 102 provided on the lower surface of an iron plate 101 bent in a U shape. A spacer 103 is formed on the lower surface of the substrate 102.
A plate 104 made of rubber, rubber-clad, spring rope or the like is fixed via a washer 105 and a screw 106. Coil patterns 108 are formed as pressure sensors 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 patterns 108. The iron plate 101 is provided for backing (backing) against a hammer hit.

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

As shown in FIG. 29, by providing a slit between adjacent magnets 107 on the plate 104, the plate 104 can be easily deformed and the sensitivity as a pressure sensor can be improved. In addition, the influence on the adjacent sensor can be minimized. Further, the magnet area may be within the width of the coil pattern 108.
Then, as shown in FIG. 30, adjacent coil patterns 1
These coil patterns 108 may be arranged so as to suppress the influence of each other and to effectively use the leakage magnetic flux. N and S represent magnetic poles. Further, as shown in FIG. 31, the rubber plate 10 is formed on the lower surface of the coil pattern 108.
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 musical instrument of the present invention, the strings and the frames associated therewith can be eliminated, and the keyboard musical instrument can be made smaller and lighter. Further, since the striking by the string striking mechanism is directly detected, the key touch feeling at the time of the performance is the same as the string striking feeling of the acoustic piano, and the tone color thereof is also the same as that of the acoustic piano. Further, the hitting does not produce sound from the hit object unit, and the sound volume is easily controlled by the sounding means.

[Brief description of drawings]

FIG. 1 is a partially cutaway 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 a keyboard instrument according to an embodiment of the present invention.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

FIG. 17 is a cross-sectional view taken along the line AA in FIG. 15 and shows a hit piece different from that in FIG.

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

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

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

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

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

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

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

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

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

FIG. 27 is a diagram showing 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 object unit of a keyboard instrument according to an embodiment of the present invention.

FIG. 29 is a view showing a slit of a hit object unit of a keyboard instrument according to an embodiment of the present invention.

FIG. 30 is a diagram showing 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 object unit of a keyboard instrument according to an embodiment of the present invention.

[Explanation of symbols]

11 key (operator), 21 action (string striking mechanism), 25 hammer (striking body), 31 hit unit (vibration damping means, viscoelastic body), 42 soundboard (sounding means), 43 soundboard drive actuator (Sound producing means), 51 Electronic control circuit, 53 CPU (selecting means), 55 RAM, 56 Input / output section, 57 Backup RAM (vibration state storing means), 66 Drive circuit (sound producing means), 72 Viscoelastic body, ~
Sensor (operator state detection means), pressure sensor (striking force detection means)

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical display location G10H 1/053 D 7345-5H 1/34 7345-5H G10K 11/16 J 7350-5H

Claims (2)

[Claims] 1. A string striking mechanism for striking an object to be hit by a striking body operating in response to a keystroke, an operator state detecting means for detecting at least a motion state of the string striking mechanism, and an acoustic piano including at least strings. Vibration state storage means for storing the vibration state of the member, selection means for selecting the vibration state stored in the vibration state storage means according to the detection result of the operating element state detection means, and the selected vibration A sound producing means for converting the state into sound and outputting the sound; a vibration damping means for absorbing impact energy to the hit body; and a viscoelastic body arranged on a hit surface of the hit body. A keyboard instrument characterized by this. 2. A string-striking mechanism in which a striking body operates in response to a keystroke to strike an object to be struck, an operating element state detection means for detecting at least a motion state of the string-striking mechanism, and an acoustic piano including at least strings. Vibration state storage means for storing the vibration state of the member, selection means for selecting the vibration state stored in the vibration state storage means according to the detection result of the operating element state detection means, and the selected vibration A sounding means for converting the state into sound and outputting the sound, a vibration damping means for absorbing impact energy to the impacted body, a viscoelastic body arranged on the impacted surface of the impacted body, and the impacted body Is a striking force detecting means for detecting a striking force applied to the hit object, and a keyboard instrument.