CN117975917A - Novel shoulder-carried electronic keyboard instrument - Google Patents

Abstract

The novel shoulder-back electronic keyboard instrument produces sound through electronic sound source and controls musical scale through right hand keyboard or Bayan keyboard and left hand Bayan keyboard, which comprises a plastic casing body similar to accordion shape, but without bellows like accordion, the electronic sound source sound control keyboard or Bayan Yang Jianpan is installed on the right side of the body, the size and shape are identical to those of the accordion keyboard or Bayan keyboard, the cylindrical Bayan button keyboard is installed on the left side of the body, the size and arrangement rule are identical to those of the accordion, the left side surface of the body is provided with a belt and a push-pull force sensing component under the belt, the playing technique of the two keyboards is the same as that of an accordion, an electronic sound source main board, an audio power amplifier, a signal output and input interface board and a battery compartment are arranged at the upper part of the middle position inside the accordion body, a left hand pulling force sensing assembly is arranged at the lower part of the middle position inside the accordion body, a complete double-channel or 2.1-channel sound box is arranged at the lower part of the middle position inside the accordion body, various functional operation buttons, knobs, pushers, crank handles, a display, a microphone and the like of the electronic sound source are arranged on the outer surface of the accordion body, and left and right braces are arranged behind the back of the accordion body, so that the electronic sound source is played on the shoulder like the accordion.

Description

Novel shoulder-carried electronic keyboard instrument

Technical Field

The present invention relates to an electronic keyboard instrument, and more particularly, to an electronic keyboard instrument capable of being carried on the shoulder for a movable performance like an accordion.

Background

The present electronic keyboard musical instrument has the electronic organ, double-row key electronic organ, electronic accordion, electronic synthesizer, electronic piano, shoulder electronic synthesizer, etc. these musical instruments have the emphasis and are now very mature, the application field is very popular, the kind is also very many, its technical core is that the electronic sound source is supplemented with various relevant controllers again to control the pronunciation of electronic sound source, in these musical instruments, double-row key electronic organ and shoulder electronic accordion multi-sound part perform best, if be matched with automatic accompaniment again, a person can play the effect of a big band. The electronic keyboard instrument with shoulder and back type, such as the battle axe of Roland, has single tone modulation performance effect, has no potential of two hands and ten fingers, is difficult to perform in a moving way, and has no microphone when a player performs, so that the microphone is troublesome to connect when playing and singing are carried out by a person, and a lot of external equipment is needed. In addition, the accordion is a well-established musical instrument with long history, and the playing fingering, especially the fingering of the left hand Bei Sijian, has already formed a unique system and characteristics, and if the electronic sound source is matched, the playing effect of the accordion is far superior to that of the traditional accordion. The existing electronic accordion has the bellows type of Japanese Roland, which has little meaning to the electronic sound source and high cost, and mainly has the bellows structure too complex to control the electronic sound source, and the practicability is not great, in addition, the novel electronic keyboard musical instrument provided by the invention can be completely switched to the accordion mode for playing.

Disclosure of Invention

In order to solve the above problems, the present invention provides a novel shoulder-carried electronic keyboard instrument, which is similar to an accordion in appearance, but has no bellows, and is provided with an electronic sound source, an audio signal amplifier, a signal transmission interface circuit, a loudspeaker and the like in the interior of the bellows part of the original accordion of the plastic instrument body shell, and related control buttons, knobs, a crank, a display, a microphone, a right-hand keyboard, a left-hand bass keyboard and the like of the electronic sound source are arranged outside the plastic instrument body shell. The arrangement of the tone names of the left and right hand keyboards is identical to that of the performance fingering and the accordion, and the effect of playing a large band can be achieved by matching with an automatic accompaniment person. Although there is no bellows, various force sensors such as resistance strain gauge can be used to set up force sensing device in the cotton pad under the left hand belt and in the left side wall of the body, along with the outward expansion of the player's hand back against the belt and the pushing of the belt fixing plate, the resistance strain gauge can sense fine force variation, and further output sound force control and tone modulation signals, the musical instrument can also produce the effect of pushing and pulling the bellows during the accordion playing, so that the cooperation of the left-hand basic bass key and the para-position bass key with the right-hand keyboard is added with automatic accompaniment, the vocal part of the musical instrument is comparable to the double-row key electronic organ, the push-pull feeling of the bellows during the accordion playing is obtained, and meanwhile, the musical instrument can be randomly moved during the playing and singed through the microphone, so that a person produces the performance effect of a band.

Detailed description of the preferred embodiments

In order to achieve the above purpose, the invention provides a novel shoulder-back type electronic keyboard instrument, which comprises a plastic organ body shell similar to an accordion body, a left hand keyboard and a right hand keyboard, wherein the tone arrangement of the keyboard is identical to that of the accordion, buttons, knobs, a crank, a display, a microphone and the like for controlling relevant parameters of an electronic sound source are arranged outside the plastic shell, and an electronic sound source main board, an audio power amplifier, a loudspeaker, a battery, a signal output/input interface circuit board and a left hand pulling force sensing sensor are arranged inside the shell. The microphone is hidden in the shell through the auto-lock pressing mode, and when using, pop up to the suitable height near singer's mouth through pressing down after popping up again, the display makes the screen face the player with convenient observation with the mode that overturns or slided rise.

Further, the body comprises a plastic shell, a keyboard or a base Yang Jianpan arranged on the right side of the shell, a bass keyboard arranged on the left side of the shell, the size and the tone name arrangement are the same as those of an accordion, the conduction sounding mode is the same as that of an electronic keyboard, and the conductive adhesive carbon film switch is used for triggering a sounding source to sound. The playing fingering is also identical to that of an accordion, and the conduction mode of the left-handed bass keyboard for controlling sound source sounding is to use two identical conductive adhesives to assist a double-sided circuit board, and syllable matrix wiring and carbon film contacts are arranged on two sides of the circuit board and are opposite to carbon film contacts on the conductive adhesives. The centers of two conductive adhesives on one key are aligned and clamped on two sides of the circuit board, the centers of the two conductive adhesives are coaxial, the contacts are normally closed and normally open, when the key is pressed, the switch on the front side and the back side of the base keyboard circuit board is just turned over, and the main board generates a force signal by detecting the turning-over on-off time of the two switches.

Further, the belt arranged on the left side of the body is arranged on a small movable external stress plate, the external stress plate is flush with the left side plate of the body but is not directly connected with the left side plate of the body, a movement gap is reserved, a metal sensing plate is arranged in the small side plate and is opposite to the small side plate, four stress strain arms are arranged on the four corners of the sensing plate, a resistance strain sheet and a stress contact are attached to each strain arm, the resistance strain sheet is similar to a resistance strain sheet for a kitchen scale, an internal stress plate corresponding to the external stress plate is arranged on the inner layer, the metal sensing plate is connected with the external stress plate through a through hole of the metal sensing plate through screws, the metal sensing plate is fixed on the left side inner wall of the shell through four round holes reserved at the corners, when the left hand pushes or pulls in the left hand and the right direction, the force applying contact on the external stress plate and the internal stress plate can drive the strain arms on the sensing plate to bend and deform, and further the resistance strain sheet on the sensing plate generates resistance change and finally generates and outputs an electric signal in proportion to the electric signal, and the sound volume can be modulated to sound with a small volume or a small harmonic wave.

Further, an inductor can be additionally arranged on the belt or a cotton pad attached to the belt through adhesion so as to reflect the force change of the hand back expanding outwards relative to the belt, and further the magnitude of a force output signal is generated and influenced.

Further, when the microphone arranged on the shell is not in use, the microphone is hidden in the shell of the body through the self-locking device, and when in use, the top end of the microphone is pressed to be ejected out of a small section and then pulled out to a proper height.

Further, when the display arranged in the middle position of the front surface of the shell is closed, the shell is flush with the shell of the body and is accommodated in the pit on the surface of the shell of the body, the screen cannot be seen from the inside to the outside, the shell of the display becomes a part of the shell of the body and is locked through the self-locking mechanism, and when the display is used, the display is pulled out to a proper height upwards and then rotated backwards for a certain angle, and because the screen is arranged on the inner side of the shell of the display, the display is just opposite to the glasses of a player so as to be convenient for observation and operation.

Further, the operation control parts of the electronic sound source such as buttons, knobs and crank handles are arranged at the hand-touch part of the shell, and the tentacles are accessible during playing.

Further, a sound box is arranged in the cavity at the lower end of the middle part of the shell, and sound emitted by the electronic sound source is finally played by the sound box or output to other equipment through a transmission interface.

Further, an electronic sound source main board, an audio power amplifier, a signal in-out interface board and a battery compartment are arranged in the upper cavity of the middle part of the shell. The lower part in the middle of the shell is provided with a closed sound box, the woofer faces forward, and the tweeter faces to the left and the right sides, so that obvious stereophonic sound effects are obtained.

Further, a left-hand bass keyboard is arranged in the left cavity of the shell, keys of the left-hand bass keyboard are exposed out of the bass keyboard panel by a certain height, and a belt push-pull force sensing device is arranged on the outer side of the left-hand bass keyboard.

Further, the brace hook of the musical instrument is also arranged on the shell, and the position and the carrying mode are exactly the same as those of the accordion.

Further, two universal cranks for controlling the push-in switching of automatic accompaniment and the recall control of panel registration memory are arranged near the left-hand bass keyboard in front of the shell.

The invention has the advantages that: although the body is not big, because the fingering is the same as that of the accordion, the accordion player can play by hands without extra practice, not only can play by moving and playing by self playing and singing by self, but also can play the effect comparable to that of the double-row key electronic organ, and the potential of the ten fingers of the two hands can be played extremely because of the cooperation of the left-hand bass keyboard.

Drawings

Fig. 1 is a right side perspective view of the outline of the present invention.

Fig. 2 is a left side perspective view of the exterior of the present invention.

Fig. 3 is a rear right side perspective view of the present invention.

Fig. 4 is a front view of the left-hand bass keyboard of the present invention with two keys normally and depressed.

Fig. 5 is a perspective view of the left-handed bass keyboard of the present invention with two keys normally and depressed.

Fig. 6 is a cross-sectional view of the left-handed bass keyboard of the present invention with two key buttons normally and depressed.

Fig. 7 is a perspective view of the key cap and conductive paste of the left-handed bass keyboard of the present invention from two perspectives.

FIG. 8 is a perspective view of a left hand pull sensing device assembly of the present invention from two perspectives.

FIG. 9 is an exploded view of the left hand pull sensing device assembly of the present invention.

FIG. 10 is a front view of the left hand pull sensing device assembly of the present invention.

FIG. 11 is a front exploded view of the left hand pull sensing device assembly of the present invention.

FIG. 12 is a front view of a sensor board of the left-hand pull sensing device of the present invention.

Reference numerals

01: Keyboard, 02: body, 03 right hand button group, knob, 05: braces are hung and buckled, 06: microphone, 07: display screen shell, 08 left-hand button group, 09: interface board, 10: bass keyboard panel, 11: accompaniment step crank, 12: panel memory step crank, 13: belt, 14: bass key, 15: tone modulation crank, 16: horn mesh, 17: total volume knob, 18, sound effect adjust knob, 19: digital wheel, 20: horn net mounting hole, 21: body feet, 22: woofer, 23: air guide holes, 24: tweeter, 25: belt toe cap, 26: cotton pad, 27: external stress plate, 28: band header, 29: body rear cover, 30: display screen, 31: keyboard set screw, 32: set screw, 33: braces peg, 34: bass key, 35: felt, 36: button cap peak, 37: lower conductive adhesive, 38: conductive adhesive carbon film, 39: carbon film of circuit board, 40: bass keyboard floor, 41: gasket, 42: spring, 43: base keyboard wiring board, 44: key shaft, 45, spring, 46: and (4) applying conductive adhesive, and 47: lower conductive adhesive, 48: and (3) applying conductive adhesive and 49: upper tensioning seat, 50: lower tensioning seat, 51: tensioning screw, 52: cotton pad, 53: fixing screw holes, 54: connection screw, 55: tensioning nut, 56: resistance strain gage, 57: strain arm, 58: stress contact, 59: force application contact, 60: sensing plate, 61: routing holes, 62: silica gel gasket, 63: connection post, 64: internal stress plate, 65: and the force application contact.

Description of the embodiments

The following provides a complete description of the aspects of embodiments of the present invention with reference to figures 1-12 of the drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention.

As can be seen from fig. 1, the invention is similar to an accordion except that there is no bellows, the body 02 is injection molded from plastic, the right hand keyboard 01 and the left hand bass keyboard 14 are identical to the accordion in terms of external dimension and size, and in terms of tone arrangement and performance fingering, the middle of the body 02 corresponds to the closed position of the accordion bellows, an electronic sound source main board, an audio power amplifier circuit board, a signal output/input interface circuit board, a power module, a battery compartment, a sound box and a loudspeaker are internally mounted, a loudspeaker net 16 is mounted on the outer side of the loudspeaker, a pull hidden microphone 06 and a strap buckle 05 are mounted on the top end of the body, a display screen shell 07 is mounted in a recessed position on the upper part of the front of the middle of the body 02, the front of the whole body is firstly turned into a vertical state and then slid down along sliding grooves on both sides to fill the front of the whole body, the whole body is then pulled out, the screen faces the player, the interface board 09 which is shielded once is exposed at the lower part of the display shell 07, various signal transmission sockets are arranged on the interface board 09, the right hand button group 03 is positioned beside the right hand keyboard 01, the right hand feeler is accessible during playing and is generally set as a panel memory control group, the knob 04 is slightly far away from the keyboard, the function regulated by the knob 04 is regulated before the beginning of playing, the regulation is basically not needed during playing, the left hand button group 08 beside the bass keyboard is an automatic accompaniment control group, the automatic accompaniment control group is frequently used during playing, and the left hand has a certain idle gap in the automatic accompaniment state, so that the buttons are arranged at the convenient position of the left hand, but the buttons are invisible during the music instrument backing, or can only be used for the operation and are easy to make mistakes, so the invention specially sets two handles, namely the accompaniment crank 11, the panel memory step crank 12 is matched, the automatic accompaniment control and the panel memory call-out are more simple, only the crank is required to be shifted in the required direction, the left hand is not required to be taken out from the belt 13 to adjust the left hand button group 08, the control of the right hand button group 03 is also the method, the required functions are preset in the shifting direction of the crank, the crank is simply and accurately shifted to a fixed position, a tone modulation crank 15 is also arranged near the position of the lower end of the bass keyboard panel 10 close to the bass keys 14, and the tone tremolo and bending effect can be adjusted by shaking the tone modulation crank.

As can be seen from fig. 2, the display screen has fallen back to the closed state, it also covers the interface board, the microphone 06 is hidden inside the body after being pressed, the speaker net is in the disassembled state, the speaker net mounting hole 20, the woofer 22, the air guide hole 23, the tweeter 2 on the left side and the foot margin 21 are components which touch the ground when the whole machine is placed, so as to prevent the musical instrument from being wetted or entering water, and also protect the body from being scratched. The large knob 18 is a data wheel, and all parameter data adjustments are made by the data wheel 18 or touch screen. The sound effect adjusting knob and microphone volume are arranged beside the data wheel 18, the total volume knob 17 is arranged beside the data wheel, a small external stress plate 27 is arranged on the left side surface of the body and is separated from the left side surface of the body by a gap, two flexible and tension-free belts 13 are arranged at the upper end and the lower end of the external stress plate 27, the upper belt is connected with an upper tensioning seat 49 through a screw, the lower belt is connected with a lower tensioning seat 50 through a screw, the two tensioning seats are connected through an inner hexagon tensioning screw 51 and a nut, the two tensioning seats are close to or separated from each other through the rotation of the tensioning screw 51 through an inner hexagon wrench when in use, the two tensioning seats are close to or separated from each other, the length of the belt 13 is adjusted, the lower belt 13 is adhered with a cotton pad 52 through a nylon adhesive tape, the two belts are torn off after the length of the two belts is adjusted, and the two belts are adhered together after the two belts are adjusted.

As can be seen from fig. 3, the rear cover 29 of the body 02 is integrally connected to the body by fixing screws 32, and has two strap studs 33 at the lower part thereof, and the display housing 07 is pulled up and then rotated rearward by a certain angle, so that the screen 30 is directed to the player at an optimum viewing angle, and eight keyboard fixing screws 31 are provided at the rear right side of the body, and the microphone 06 is in a pulled-out state.

As can be seen from fig. 4, the bass keys 14 and 34 are at different heights, the key shaft 44 is respectively connected with the spring 42, the gasket 41, the conductive adhesive 47, the bass keyboard circuit board 43, the circuit board carbon film 39, the conductive adhesive 46, the buffer felt 35 and the bass keyboard panel 10 from bottom to top, wherein the middle part of the key shaft is thicker than both ends, a circular ring-shaped platform is formed at the excessive thickness, two bowl-shaped conductive adhesives are oppositely arranged on the platforms at the upper end and the lower end, a circle of carbon film is coated on the edge of the conductive adhesive, a round hole is formed at the center of the conductive adhesive so as to enable the key shaft to pass, the carbon films on the conductive adhesive correspond to the two carbon film switch wires on the bass keyboard circuit board 43, the lower conductive adhesive 47 is bonded with the circuit board, the upper conductive adhesive 46 and the circuit board are not bonded and are in a normally open state, when the conductive adhesive carbon film contacts the carbon film switch wire of the circuit board, the switch is turned on, otherwise, the lower conductive adhesive 47 is always attached to the circuit board to enable the carbon film switch to be normally open, and the upper conductive adhesive 46 is always in a state of leaving the circuit board, so that the carbon film switch is normally closed, in order to more easily distinguish the key motion state, the bass keyboard parts are repeatedly numbered, when the bass key 34 is pressed, the upper conductive adhesive 48 and the lower conductive adhesive 37 move downwards along with the key shaft 44, the state of the conductive adhesive attached to the circuit board is turned over, finally the carbon film 38 is enabled to move downwards to leave the carbon film switch of the bass keyboard circuit board 43 and be disconnected, the carbon film below the upper conductive adhesive 48 is enabled to be attached to the carbon film switch of the bass keyboard circuit board 43 and be conducted, the opening and closing states of the two conductive adhesive switches are turned over, and the time difference of the switching states of the upper switch and the lower switch is the force value of the key, that is, the larger the key force is, the faster the sinking speed is, the shorter the switching time difference is, and finally the sound volume is increased, otherwise the sound volume is decreased. When the player leaves the bass key, the bass button is sprung up to return to normal state under the action of the spring 42, so that the open-close state of the two switches is turned over again until the next time of being pressed down again, the playing volume control is repeated, the pressed-down bass key 34 is equivalent to sleeving a top hat on the key shaft 44, the cap peak 36 also has the function of positioning upwards, so that the key shaft 44 cannot punch out the bass keyboard panel 10 too much, the cap peak 36 is tightly pressed down on the upper surface of the conductive adhesive 48, the conductive adhesive is stably clamped on the annular step surfaces of the cap peak 36 and the key shaft 44 so as not to slide up and down, the spring is compressed to be the shortest when the key is pressed down, for example, the spring 45 is in state, the largest sinking depth is positioned by the counter bore on the bass keyboard bottom plate 40, but the spring is sprung up to drive the gasket 41 to be sprung up along with the key shaft 44, and the lower surface of the gasket 41 is tightly clamped down on the annular step surface 47 of the key shaft 44 so as not to slide up and down. The cushioning felt 35 is provided to eliminate the striking noise of the key cap bill 36 against the bass keyboard panel 10 when the keys rebound.

As can be seen from fig. 5, the motion states of the two bass keys, the bass keys 14 and 34 and the bass keyboard panel 10 have a certain gap, so that friction is not generated as much as possible when the keys move up and down, the flexibility of the keys is ensured, the bass keyboard circuit board 43 is made of a double-sided copper-clad plate, a circular double-wire carbon film switch is arranged around a round hole of each bass key according to the arrangement of a syllable switch matrix of the main board, and the corresponding switch state can be turned over instantaneously as long as the conductive adhesive of the bass keys leaves or is attached, thereby triggering sound source pronunciation and controlling the pronunciation amount.

As can be seen from fig. 6, the step surface of the key shaft 44 and the cap peak 36 of the bass key 14, 34 respectively form a pressing and fixing manner for the bottom surface of the corresponding conductive adhesive bowl, and the springs 42, 45 correspondingly press and fix the bottom surface of the conductive adhesive bowl corresponding to the step surface of the key shaft 44 against the gasket 41, so that other components synchronously follow up when the bass key 14, 34 moves up and down, the highest position of the bottom is in the A-A plane and the lowest position is in the B-B plane of the counter bore of the bass keyboard bottom plate 40 when the key shaft 44 is lifted.

As can be seen from fig. 7, the appearance of the bass key 14 and the conductive adhesive 37 and 46 is perspective, the cap peak 36 below the bass key 14 is separately numbered for more exactly describing the usage, the upper conductive adhesive 46 and the lower conductive adhesive 37 are two identical bowl-shaped bodies with opposite pain axes, the conductive adhesive carbon film 38 attached to the edge is a circular arc-shaped whole piece, the corresponding double-wire carbon film switch on the bass keyboard circuit board 43 is turned on when being tightly attached, turned off when being separated, the central round hole is a key shaft penetrating hole, and the gap between the two carbon films is a conductive adhesive exhaust port, so as to prevent the conductive adhesive from being adsorbed on the bass keyboard circuit board 43 and failing to rebound.

As can be seen from fig. 8, the left hand tension sensing assembly is composed of the belt 13, the external stress plate 27, the upper tension seat 49, the lower tension seat 50, the tension screw 51, the cotton pad 52, the connecting screw 54, the sensing plate 60, the internal stress plate 64 and the like, and is a perspective view from two views, wherein the fixing screw hole 53 is a through hole for fixing the left hand tension sensing assembly on the inner wall of the body shell by using the screw, and the outer surface of the external stress plate 27 is flush with the left side surface of the body after installation and a gap is left around.

As can be seen from fig. 9, the sensing plate 60 sandwiched between the external stress plate 27 and the internal stress plate 64, which are made of plastic by injection molding, is formed by punching metal, fixing screw holes 53, four strain arms 57, square holes of four embedded silica gel washers 62, a wiring hole 61 is punched in the center of the four strain arms, resistive strain gauges are attached to both front and back surfaces of the middle part of the four strain arms 57, and a stress contact 58 is riveted at the top ends of the strain arms 57. The upper tensioning seat 49 and the lower tensioning seat 50 outside the outer stress plate 27 are formed by plastic injection molding, a step round hole is reserved in the middle in the vertical direction, the tensioning screw rod 51 and the tensioning nut 55 penetrate through the round hole, and the length of the belt 13 can be adjusted by adjusting the tightness of the tensioning screw rod and the tensioning nut through an inner hexagonal wrench when the tension plate is used, so that the tension plate is suitable for players with arms of different sizes. Four gaskets 62 made of silica gel are inlaid in four square holes of the induction plate 60, a square hole for the connecting column 62 to pass through is reserved in the middle of the gasket, a screw hole is reserved in the middle of the connecting column 62, and a force application contact 59 on the internal stress plate 64 is aligned and tightly attached to a stress contact 58 on the strain arm 57 and is aligned with an external stress plate force application contact on the other side of the induction plate 60 to jointly clamp the stress contact 58. The strain gauge and other strength induction sensors can be arranged at the proper positions of the belt 13, the upper tensioning seat 49 and the lower tensioning seat 50 and the cotton pad to induce the strength of the left hand of the player expanding outwards, so as to obtain the pull sense sound effect of the simulated bellows,

As can be seen from fig. 10, the internal stress plate 64 and the external stress plate 27 are clamped by the middle sensing plate 60, and are connected together by the connecting screw 54, the sensing plate 60 is fixed on the inner wall of the body shell, so that when the whole left hand pulling force sensing assembly is used for applying force left and right to the arm and palm during playing, the stress contact 58 is extruded by the force application contact 59 and the force application contact 65 to bend and deform the strain arm 57, and further the resistance value of the resistance strain gauge 56 is changed to generate an output signal, and the internal stress plate 64, the external stress plate 27 and the sensing plate 60 are connected together by the connecting screw, but the sensing plate and the stress plate are not fixed together, but are flexibly connected together by the silica gel gasket 62, so that when the sensing plate 60 is fixed on the inner wall of the body, the internal stress plate 64 and the external stress plate 27 can move left and right under the action of the pushing force of the arm, and the force application contacts 59 and 65 closely attached to the stress contact 58 can accurately conduct the external force to the strain arm 57.

As can be seen in fig. 11, the force contacts 65, 59 and the stress contact 58 connected by the two-dot chain line are aligned, and the force results are all reflected on the resistive strain gauge 56, and the inner and outer sensing plates 64, 27 are flexibly isolated from the sensing plate 60 by the silicone gasket 62 although they are connected together.

As can be seen in fig. 12, the sensing plate 60 has four strain arms 57 at four corners, each of which has a resistive strain gauge 56 and stress contacts 58 on opposite sides thereof, and the connecting posts of the inner and outer stress plates are screwed together through a silicone gasket 62 fitted over the through holes of the sensing plate 60. The resistive strain gauges are attached to the front and back sides of the four strain arms to detect stress deformation in more directions, and besides the fact that the four strain arms are synchronously bent perpendicular to the plane of the sensing plate 60, unsynchronized bending deformation of the strain arms at the upper end, the lower end, the left end, the right end and even at a certain angle can be detected, and sensing output of force applied in different directions is obtained, so that parameters such as volume and tremolo, tone modulation and the like can be controlled.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it is therefore desired that the present invention be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (9)

1. The novel shoulder-backed electronic keyboard instrument is characterized by comprising an instrument body shell similar to an accordion shape, but without an accordion, a playing keyboard comprising a keyboard with a Bayang shape and an arrangement rule is arranged on the right side of the instrument body shell, a keyboard similar to an accordion bass is arranged on the left side of the instrument body, the size, shape and arrangement rule are identical to those of the accordion, a belt is arranged on the left side surface of the instrument body, a left hand pulling force sensing assembly taking a resistance strain gauge or a piezoelectric ceramic plate as a core is arranged on the left side surface of the instrument body shell, an electronic sound source main board, an audio power amplifier, a signal transmission interface board, a battery compartment and a loudspeaker are arranged in the instrument body shell, buttons, knobs, pushers and rockers for adjusting various parameters and adjusting states of the electronic sound source are arranged outside the instrument body shell, the displays face towards a player, a pressing or pulling hidden type microphone shell is arranged on the upper portion of the instrument body, an electronic sound source main board, an electronic sound source, an audio power amplifier and a signal transmission interface board are arranged on the left side of the instrument body shell, and a music instrument body are arranged on the outer side of the instrument body shell, and the back of the instrument body is switched through the back of the instrument body through the touch panel when the instrument body is switched.

2. The novel shoulder-carried electronic keyboard instrument according to claim 1, wherein the body housing of the accordion model is formed by plastic injection molding, the electronic sound source main board and other circuit boards are all installed inside the body housing, the sound source main board and the power amplifier are all adjusted by parameters such as a knob, a button, a push button, a crank control or a display touch screen control installed on the body housing, and various output and input signals and power interfaces are all connected by an interface board installed on the body.

3. The novel shoulder-carried electronic keyboard instrument according to claim 1, wherein a crank for controlling a progress of playing and tone modulation and bending function is installed at an adjacent portion of the body case near the keyboard.

4. The novel shoulder-carried electronic keyboard instrument according to claim 1, wherein the sensing assembly for sensing the push-pull force of the left hand is mounted on the left side surface of the body case corresponding to the left hand strap or the strap and cotton pad contacting the back of the hand.

5. The novel shoulder-backed electronic keyboard instrument according to claim 1, wherein the sound and force of the left-hand bass keyboard are obtained by carbon film contact switches on two identical circular bowl-shaped conductive adhesive tapes axially opposite and sandwiching a double-sided circuit board, and one switch is normally open and the other switch is normally closed, and the sound signal and force of the right-hand keyboard or the baverage keyboard are also obtained by conducting the conductive adhesive carbon film contact switches.

6. The novel shoulder-backed electronic keyboard instrument according to claim 1, wherein the monitor mounted to the body case is raised with the screen facing the player's face by flipping or pulling.

7. The novel shoulder-carried electronic keyboard instrument according to claim 1, wherein the hidden microphone mounted on the upper portion of the body case is hidden inside the body by pressing the self-locking device when not in use.

8. The novel shoulder-carried electronic keyboard instrument according to claim 1, wherein two ends of two braces for carrying the instrument are hung and fastened on corresponding hooks at the rear parts of the upper and lower surfaces of the body casing, and the instrument is carried on the back during playing.

9. The novel shoulder-backed electronic keyboard instrument according to claim 1, wherein the bar Yang Jianpan or the normal keyboard is mounted on the right side of the body for right-hand playing, and the bass keyboard is mounted on the left side of the body for left-hand playing.