JP2007310320A - Musical sound system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent abnormal vibration/abnormal sound without striking vibration of a drive part and vibration of a sound board by separating a drive part of an electromagnetic drive body and the sound board. <P>SOLUTION: A plurality of dome-like or truncated cone-like connection piece 21 are adhered on the sound board 1 to fix a diaphragm 13 of an electromagnetic drive unit 11 on the connection piece 21 by bolts 25, nuts 23 and washers 27. The connection pieces 21 have the same shapes, the same size and the same material, are mutually arranged at point-symmetrical or line-symmetrical positions to the center of the diaphragm 13, and vibration of the diaphragm 13 is uniformly transmitted to the sound board 1. Since the size of the upper face of the connection piece 21 is smaller than the size of the bottom face, the diaphragm 13 lessens to strike on the upper face of the connection piece 21 to eliminate the abnormal sound. Vibration of the diaphragm 13 is efficiently transmitted by being amplified or without being attenuated through the dome-like or tapered connection piece 21. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a musical sound device, and more particularly, to a device that vibrates a soundboard of a musical instrument and generates and emits a sound from the soundboard.

  Conventionally, in order to vibrate such a soundboard (diaphragm), an electromagnetic drive is joined to the piano soundboard, and a musical sound signal is sent to the electromagnetic drive to vibrate the soundboard instead of the electromagnetic drive. The sound is emitted and emitted from this soundboard.

Japanese Utility Model Publication No. 60-150894 JP-A-8-146949 JP-A-8-111896 JP-A-4-156799 JP-A-53-69624 JP-A-4-56996 Japanese Patent Laid-Open No. 5-80748 JP 5-73039 A

  However, since such an electromagnetic drive body is in close contact with the soundboard (vibration plate), the drive portion of the electromagnetic drive body, that is, the vibration portion and the soundboard (vibration plate) collide with each other due to vibration, resulting in abnormal vibration. / Abnormal noise may occur.

  In order to achieve the above object, the present invention relates to an electromagnetic driving body that converts a musical sound signal composed of a plurality of types of musical sounds into a mechanical change and drives a soundboard of a musical instrument to emit a sound. The drive member and the soundboard are separated from each other, and the drive member and the soundboard are connected to each other, and the connection member is in contact with only a part of the surface of the drive portion.

  As a result, the drive part of the electromagnetic drive body and the soundboard are separated from each other, so that the drive part of the electromagnetic drive body, that is, the vibration part and the soundboard (vibration board) do not collide with each other due to vibration / drive / displacement. Abnormal vibrations / abnormal sounds due to resonance, such as “biri-biri” or “grigari”, are no longer generated, and the musical sound emitted from the soundboard is cleared.

  Moreover, since the drive part of the electromagnetic drive body is separated from the soundboard, the heat of the drive part of the electromagnetic drive body is not accumulated and is smoothly radiated. Furthermore, since the drive portion of the substantially parallel electromagnetic drive body and the soundboard are not in close contact with each other, abnormal resonance and abnormal vibration between them are prevented.

  In addition, since the driving part of the electromagnetic driving body itself does not radiate sound, it is not necessary to consider the sound generated from the connecting member when emitting the sound, and it is also necessary to consider the sound generated from the driving part of the electromagnetic driving body. Therefore, only the sound generated from the soundboard needs to be considered, and analysis and analysis of the sound generated from the entire musical sound device becomes easy.

(1) Soundboard 1 ...
FIG. 1 shows a plurality of soundboards 1. The soundboard 1 is a wooden square plate, and both ends of the soundboard 1 are bonded to the frame plate 5 of the musical instrument with an adhesive or fixed with nails, bolts, wood screws, or the like. The frame plates 5 are a musical instrument side plate, frame wood, side soundboard, column, frame, roof, bottom plate, shelf, frame, and the like.

  On the back surface of the soundboard 1..., The soundbars 6... Are joined vertically or diagonally, bonded or fixed with nails, bolts, wood screws or the like. The soundboard 1, soundbar 6 and so on become a soundboard and soundbar of an actual musical instrument such as an electronic musical instrument, an acoustic instrument, or a combined musical instrument such as an electronic piano or an electronic organ. The sound board 1 and the sound bar are oscillated to emit sound.

  The sound board 1 is made of non-impregnated wood, plywood, laminated wood, glass or hard resin (acrylic), which is impregnated with dry or moisture-containing wood or resin. The same wood is used for keyboard instruments such as tech piano organs and electronic keyboard instruments such as electronic pianos and organs. The same material as the front plate, back plate, side plate, torso, fingerboard, etc. of string instruments such as cello and violin, percussion instrument such as xylophone and drum, and wooden parts such as membrane and torso may be used.

  The material of the soundboard 1 may be aluminum, stainless steel, iron, titanium, magnesium, brass, platinum or an alloy thereof, a steel plate such as a cold rolled steel plate, glass, hard resin (acrylic), or the like. Note that the same material may be used for the tube and body of wind instruments such as flutes and oboe, the sounding body of percussion instruments such as cymbals and triangles, and the metal parts such as the trunk.

  The soundboard 1 is divided into four large, medium, small, and small sizes. These soundboards 1 extend in the horizontal direction and are small, medium, small, and large from above. It is arranged in the order. The horizontal lengths (widths) of these four soundboards 1 are the same. Therefore, among the musical tone signals composed of plural types of musical tones, they are divided from top to bottom in the order of high, medium, high and low tones, and mechanical displacement / mechanical change / Mechanical vibration / mechanical drive is performed, and a musical sound is generated and emitted.

  By the way, the soundboard 1 is flat and the surface is flat. Therefore, the sound produced and emitted from these soundboards 1 ... is a plane wave, and there is no difference in sound pressure between the left and right ears depending on the position of the ear, compared to the case of a spherical wave, and the sound image position over a wide range. Can be formed at a fixed position, and even if the position of the ear with respect to the soundboard 1 is considerably shifted, the difference in sound pressure between the left and right ears is not felt, and the sound image does not shift.

  Then, as mentioned above, the treble, middle, treble and bass are arranged vertically, and since each of these sounds is a plane wave, the position of the ear is shifted to the left and right for each treble, middle, treble and bass. Even if they are shifted up and down, it is difficult to sense the difference in sound pressure between the left and right ears, and the position of the sound image does not shift depending on the position of the ears, so that there is no sense of incongruity in hearing.

  The soundboards 1 may be arranged side by side, but in that case, there is a difference in the sound pressure to the left and right ears of each of the high, medium, high and low ranges, and the sound image position of each range. Will also shift depending on the position of the ear, causing a sense of incongruity in hearing.

(2) Structure of Electromagnetic Drive Units 11 The outer shape of the electromagnetic drive units 11 is composed of a cylindrical main body case 12 and a circular flat diaphragm 13 provided on the lower surface of the main body case 12. The electromagnetic drive unit 11 includes a coil and a magnet, and the coil is connected to one of the main body case 12 and the diaphragm 13 and the magnet is connected to the other.

  When a musical sound signal consisting of a plurality of types of musical sounds flows through the coil, the coil or magnet vibrates / drives / displaces due to the interaction between the magnetic field generated in the coil and the magnetic field of the magnet, and the diaphragm 13 moves relative to the body case 12. Vibrate / drive / displace. One of the main body case 12, that is, the coil and the magnet, is fixed to the heavier musical instrument main body side, and the diaphragm 13, that is, the other is joined to the soundboard 1, either directly or via a connecting member (attachment / connection). (Including adhesion).

  Accordingly, the diaphragm 13 and the soundboard 1 can be electromagnetically driven and vibrated with respect to the instrument body. Unlike the speaker, the electromagnetic drive units 11 ... do not sound / sound themselves, but electromagnetically drive other joined objects to vibrate and emit / sound. Such electromagnetic drive units 11 are disclosed in Japanese Patent Laid-Open Nos. 8-146949 and 8-111896.

(3) Attachment structure of electromagnetic drive unit 11 FIGS. 2, 3 and 4 show the attachment structure of the electromagnetic drive unit 11 to the soundboard 1. On the back surface of the soundboard 1..., Four (or a plurality of) connecting pieces 21 are bonded with an adhesive without gaps at equal intervals and equal angle positions corresponding to each vertex of a square (or polygon).

  The connecting pieces 21 have a dome shape or a truncated cone shape, and the outer surface of the connecting pieces 8 has a taper shape curved outward, and the size of the upper surface is smaller than the size of the bottom surface. The bottom surface of the connecting piece 8 and the back surface of the soundboard 1 are bonded together. A hole 22 is formed vertically on the upper surface of the connecting piece 21... And a nut 23 (fixing tool) is installed and built in the inner bottom surface of the hole 22.

  Four through holes 24 are formed on the periphery of the diaphragm 13 of the electromagnetic drive unit 11 at equal intervals and at equal angles, and bolts 25 (fixing tools) are inserted from above the through holes 24. Are screwed into the nuts 23 in the holes 22 of the connecting pieces 21.

  As shown in FIG. 3, these bolts 25... And nuts 23 (fixing tools) are built in the connecting pieces 21 and are not exposed on the surface of the soundboard 1. Therefore, the member / means for fixing and fixing the electromagnetic drive unit 11 (diaphragm 13) and the soundboard 1 is not visible at all from the front side of the soundboard 1, and the front side of the soundboard 1 is clean and has a beautiful design. .

  Further, if the fixing and fixing means such as bolts and nuts penetrate or come into contact with the soundboard 1, there is a bad influence on the sound of the soundboard 1, and an abnormal sound that is not included in the original musical sound signal is generated. Nothing is gone. Note that the through hole 24 may or may not penetrate the connecting piece 21. If not penetrating, the bolts 25 will not come into contact with the soundboard 1, and abnormal sound generation can be prevented.

  Further, the diaphragm 13 of the electromagnetic drive unit 11 and the soundboard 1 are separated by the height of the connecting piece 21, and the diaphragm 13 and the soundboard 1 are connected by the connecting piece 21. Fixed. Moreover, the upper surface of the connecting piece 21 contacts only a part near the edge of the diaphragm 13. As a result, the diaphragm 13 and the soundboard 1 of the electromagnetic driver unit 11 do not collide with each other by vibration, and abnormal vibration / abnormal sound is not generated.

  A washer 27 (fixing tool) is inserted outside the bolt 25, and the washer 27 is sandwiched between the lower surface of the head 26 extended outward from the upper end of the bolt 25 and the upper surface of the connecting piece 21. Since the thickness of the washer 27 can be changed by changing the washer 27, the thickness of the diaphragm 13 of the electromagnetic driver unit 11 changes, the height of the connecting piece 21 and the depth of the hole 22 change. Or even if the length of the bolt 25 changes.

  The connecting pieces 21 have a dome shape or a truncated cone shape, and the size of the upper surface is smaller than the size of the bottom surface, so that the vibration plate 13 of the electromagnetic driver unit 11 and the upper surface of the connecting pieces 21 collide by vibration. Thus, abnormal vibration / abnormal sound is not generated, and the vibration of the diaphragm 13 is efficiently amplified to the soundboard 1 without being amplified or attenuated by the dome-shaped or tapered connecting piece 21. Communicated.

  Since the connecting pieces 21 are made of the same material as the sound board 1 and made of wood, vibrations from the diaphragm 13 of the electromagnetic driver unit 11 are formed on the bonding surface between the connecting pieces 21 and the sound board 1. / Sound is not reflected and lost.

  The connecting pieces 21 may be made of a material different from that of the sound board 1 or the same material as that of the diaphragm 13 of the electromagnetic driver unit 11. In this case, the connecting pieces 21 may be integrally formed with the diaphragm 13 or welded. The connecting pieces 21 may be integrally formed with the soundboard 1 or may be fixed to the soundboard 1 with nails, bolts, wood screws or the like.

  The shape of the connecting piece 21 is a dome shape or a truncated cone, an elliptical truncated cone, a regular truncated pyramid, a long truncated pyramid, a hemispherical shape, a trapezoidal plate, a Mt. Fuji type, and the like. Is desirable. As a result, abnormal vibration / abnormal sound is not generated as described above, and the vibration of the diaphragm 13 is efficiently transmitted to the soundboard 1. Therefore, the area of the upper surface of the connecting piece 21 may substantially coincide with the area of the hole 22.

  The shape of the connecting pieces 21 may be the same size on the top surface and the bottom surface, such as a cylinder, an elliptical column, a regular prism, a long prism, a rectangular plate, a cube, a rectangular parallelepiped, or the like. 21 may be reversed and the size of the top surface may be larger than the size of the bottom surface.

  The height of the connecting pieces 21, that is, the separation distance between the diaphragm 13 and the soundboard 1 of the electromagnetic drive unit 11, is the maximum drive displacement / vibration amplitude of the soundboard 1. 1 to 50 times, preferably 1.5 to 25 times, more preferably 2 to 15 times, more preferably 2.5 to 10 times, and even more preferably 3 to 5 times.

  As a result, the diaphragm 13 and the soundboard 1 of the electromagnetic driver unit 11 are separated from each other, so that they do not collide with each other and abnormal vibration / abnormal sound is not generated. Further, since the diaphragm 13 of the electromagnetic driver unit 11 is separated from the soundboard 1, heat of the diaphragm 13 of the electromagnetic driver unit 11 is not accumulated and is smoothly radiated. When the diaphragm 13 becomes hot, the vibration efficiency of the diaphragm 13 decreases, and the sound becomes muddy and does not become clear. However, if the heat is smoothly radiated in this way, the musical sound from the soundboard 1 becomes clear.

  In addition, since the diaphragm 13 and the soundboard 1 that are both flat and substantially parallel are separated and do not adhere to each other, abnormal resonance and abnormal vibration between them are prevented. As long as the diaphragm 13 and the soundboard 1 are substantially parallel to each other, they may be flat surfaces, spherical surfaces, cylindrical surfaces, other curved surfaces, and polyhedral surfaces. In some cases, the diaphragm 13 and the soundboard 1 may not be parallel.

  The diaphragm 13 of the electromagnetic drive unit 11 is different from a speaker cone, a flat plate diaphragm, or the like, and is supplied with a signal having power to drive due to its weight. The vibration is transmitted to other objects such as 1 to make a sound. Accordingly, the connecting piece 21 transmits vibrations without any abnormality, and is not in a cone, plate vibration plate, or sounding body that produces sound, and the vibration plate 13 penetrates the sound board 1. There is nothing to make a sound.

  Since the diaphragm 13 of the electromagnetic driver unit 11 itself does not emit sound, it is not necessary to consider the sound generated from the connecting piece 21 when emitting the sound, and the diaphragm 13 of the electromagnetic driver unit 11 does not have to be considered. There is no need to consider the generated sound, only the generated sound from the soundboard 1 needs to be considered, and analysis / analysis of the generated sound from the entire musical sound device is facilitated.

  As the distance, that is, the height of the connecting pieces 21 becomes smaller, the transmission loss of vibration from the diaphragm 13 to the soundboard 11 decreases. On the contrary, as the distance, that is, the height of the connecting pieces 21 increases, the vibration plate 13 and the soundboard 1 of the electromagnetic driving unit 11 do not collide with each other due to vibration, and abnormal vibration / abnormal sound is generated. Less.

  As the number of the connecting pieces 21 increases and the interval between the connecting pieces 21 decreases, the vibration amplitude of the soundboard 1 and / or the diaphragm 13 between the connecting pieces 21 decreases. The interval, that is, the height of the connecting piece 21 is reduced. Conversely, as the number of connecting pieces 21 decreases and the interval between the connecting pieces 21 increases, the vibration amplitude of the soundboard 1 and / or the diaphragm 13 between the connecting pieces 21 increases. Spacing distance, that is, the height of the connecting piece 21 is increased.

  Each of the plurality of connecting pieces 21 has the same shape, the same size, and the same material. Thereby, the vibration of the diaphragm 13 of the electromagnetic driver unit 11 is homogeneously transmitted to the soundboard 1 and there is no variation. Each of the plurality of connecting pieces 21 may have a different shape, a different size, or a different material.

  The surface of the diaphragm 13 of the electromagnetic drive unit 11 facing the soundboard 1 is circular, the shape of the diaphragm 13 is point-symmetric with respect to the center of the diaphragm 13, and the shape of the diaphragm 13 is The shape is axisymmetric with respect to the center line of the diaphragm 13.

  Thus, if it is point symmetry or line symmetry, the shape of the diaphragm 13 is an ellipse, a triangle, a square, a rectangle, a rhombus, a regular polygon, a star shape, a cross shape, a flower shape, and the outlines of these shapes. A ring shape or a frame shape may be used. Thus, if the shape of the diaphragm 13 is point symmetric or line symmetric, the vibration of the diaphragm 13 of the electromagnetic driver unit 11 is uniformly transmitted to the soundboard 1 and there is no variation.

  Each of the plurality of connecting pieces 21 is disposed at a point-symmetrical or line-symmetrical position with respect to the diaphragm 13 of the electromagnetic driver unit 11. Thereby, the vibration of the diaphragm 13 of the electromagnetic driver unit 11 is homogeneously transmitted to the soundboard 1 and there is no variation. The plurality of connecting pieces 21 may be arranged at positions that are not point-symmetric or line-symmetric with respect to the diaphragm 13.

  The diaphragm 13 of the electromagnetic driver unit 11 is fixed to the connecting pieces 21 with the bolts 25, nuts 23, and washers 27. The thickness of the connecting pieces 21 is the bolts 25, nuts 23 (or Further, it is larger than the thickness of the washer 27), and the total length of the bolt 25 and nut 23 and the thickness of the diaphragm 13 is larger than the length of the bolt 25 and nut 23. Thereby, the bolt 25 and the nut 23 excluding the head 26 can be covered from the outside, and the vibration / drive / displacement of the diaphragm 13 is not adversely affected.

  The spacing between the diaphragm 13 of the electromagnetic driver unit 11 and the soundboard 1 is equal to the height (length) of the connecting pieces 21. Therefore, the separation distance between the diaphragm 13 and the soundboard 1 can be switched simply by exchanging the connecting pieces 21 having different heights.

  As shown in FIG. 4, the electromagnetic drive units 11 and the connecting pieces 21 are attached at positions shifted from the centers of the soundboards 1. Thus, if the electromagnetic drive units 11 and the connecting pieces 21 are located at positions shifted from the centers of the soundboards 1, resonance of the soundboards 1 can be prevented. The electromagnetic drive units 11 and the connecting pieces 21 may be located at the center of each soundboard 1. Thus, the soundboards 1 can be greatly oscillated / driven / changed / displaced to produce a louder sound.

  The electromagnetic drive units 11 and the connecting pieces 21 are positioned at the center of the upper and lower edges of the soundboards 1. Thereby, each sound board 1 ... can be greatly vibrated / driven / changed / displaced. Note that the electromagnetic drive units 11 and the connecting pieces 21 may not be positioned at the center of the upper and lower edges of each soundboard 1 but may be positioned near the corner of each soundboard 1. As a result, no loud sound is produced, but resonance can be reduced.

  When all or part of the soundboard 1 is made of metal, the propagation speed of vibration and sound is larger than that of the wooden soundboard 1. Since distortion is reduced and flattened, it is difficult to feel the difference in sound pressure between the left and right ears, and the position of the sound image does not shift depending on the position of the ears, and there is no sense of incongruity in hearing.

  In addition, the metal soundboard 1 ... contains more nonharmonic sound components even when the same musical sound is produced and emitted compared to the wooden soundboard 1 of the same size. Since many components exist at a high frequency, it is possible to make the musical tone feel brilliant, and to generate width and depth in the musical tone. In addition, as the amount of the anharmonic sound component increases, the overall volume increases.

(4) Other Embodiments The present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention. For example, as shown in FIG. 5, the diaphragm 13 of the electromagnetic drive unit 11 is elliptical, the three connecting pieces 21 are equidistant from the center of the elliptical diaphragm 13, and the three connecting pieces 21 are ... Are equally spaced.

  Even in this case, the shape of the diaphragm 13 is point-symmetric or line-symmetric, and the plurality of connecting pieces 21 are arranged at positions that are point-symmetric or line-symmetric with respect to the diaphragm 13. Thereby, the vibration of the diaphragm 13 of the electromagnetic driver unit 11 is homogeneously transmitted to the soundboard 1 and there is no variation. In this case, as shown by a chain line, the two connecting pieces 21 may be semicircular.

  Further, as shown in FIG. 6, the diaphragm 13 of the electromagnetic drive unit 11 is rectangular, the two connecting pieces 21 are positioned in the vicinity of the vertex of the rectangular diagonal position, and the two connecting pieces 21 are rectangular vibrations. The distance between the centers of the plates 13 is equal, and the three connecting pieces 21 are equally spaced.

  Even in this case, the shape of the diaphragm 13 is point-symmetric or line-symmetric, and the plurality of connecting pieces 21 are arranged at positions that are point-symmetric or line-symmetric with respect to the diaphragm 13. Thereby, the vibration of the diaphragm 13 of the electromagnetic driver unit 11 is homogeneously transmitted to the soundboard 1 and there is no variation. In this case, as shown by a chain line, the two connecting pieces 21 may be formed in an elongated rectangular shape and may be arranged on the inner side from the periphery of the diaphragm 13.

  The sizes of the electromagnetic drive units 11 and the diaphragms 13 can be variously changed. Accordingly, the interval between the connecting pieces 21 changes, so that the height of the connecting pieces 21 is changed by replacing the connecting pieces 21 with different heights, and the diaphragm 13 of the electromagnetic drive unit 11. The separation interval with the soundboard 1... Also changes.

  The connecting pieces 21 may be provided not only at the periphery of the diaphragms 13 of the electromagnetic drive units 11 but also at the center, or between the center and the periphery. If the connecting pieces 21 are provided only on the periphery of the diaphragms 13 of the electromagnetic drive units 11, vibrations are uniformly transmitted to the connecting pieces 21. The soundboard 1 is flat, but may be curved in a concave shape or may be curved in a convex shape. Thereby, the waveform of the musical sound generated from the soundboard 1 is not a plane wave but a spherical wave.

  The musical tone signal composed of plural types of musical tones is composed of plural types of musical instruments, timbres, tone pitches and / or touch musical tone signals, and is a tone signal that is polyphonically generated. The tone of each frequency band is included. Such musical tone signals include the musical tone signal of the instrument string itself, the pipe itself, and the percussion part, as well as the musical tone signal of the soundboard part. Or only the sound signal of the soundboard part.

  The bolt 25, the nut 23, or the washer 27 (fixing tool) may be the same material or the same hardness (hardness) as the diaphragm 13. As a result, the vibration / sound reflection loss is reduced at the contact surface of the diaphragm 13 with the bolt 25 and the washer 27. Further, the bolt 25, the nut 23, or the washer 27 (fixing tool) may be the same material or the same hardness (hardness) as the connecting piece 21. As a result, the vibration / sound reflection loss is reduced on the contact surfaces of the connecting piece 21, the bolt 25, the nut 23, and the washer 27.

  The connecting piece 21 may be the same material as the sound board 1 or the same hardness (hardness). This reduces vibration / sound reflection loss at the contact surface between the connecting piece 21 and the soundboard 1. Of course, these same materials may be different materials or different hardness (hardness). Further, the bolt 25, nut 23, or washer 27 (fixing tool) may be an intermediate material or intermediate hardness (hardness) between the connecting piece 21 and the diaphragm 13. As a result, the vibration / sound reflection loss as a whole of the musical sound device from the diaphragm 13 to the soundboard 1 is reduced.

(5) Effects of other inventions
[1] An electromagnetic driving body that converts a musical sound signal composed of a plurality of types of musical sounds into a mechanical change, drives a soundboard of a musical instrument to emit sound, and a driving portion of the electromagnetic driving body and the soundboard A musical sound device characterized in that it is a connecting member that is spaced apart and connects the drive part and the soundboard, the connecting member contacting only a part of the surface of the drive part.

  As a result, the drive part of the electromagnetic drive body and the soundboard are separated from each other, so that the drive part of the electromagnetic drive body, that is, the vibration part and the soundboard (vibration board) do not collide with each other due to vibration / drive / displacement. Abnormal vibrations / abnormal sounds due to resonance, such as “biri-biri” or “grigari”, are no longer generated, and the musical sound emitted from the soundboard is cleared. Moreover, since the drive part of the electromagnetic drive body is separated from the soundboard, the heat of the drive part of the electromagnetic drive body is not accumulated and is smoothly radiated.

[2] The distance between the drive portion of the electromagnetic drive body and the soundboard is 1 to 50 times, preferably 1.5 to 25 times the maximum drive displacement of the drive portion and / or the soundboard. 2 times, more preferably 2 times to 15 times, more preferably 2.5 times to 10 times, and even more preferably 3 times to 5 times, and a plurality of the connecting members. As the distance increases, the separation interval is increased, the surface of the driving portion of the electromagnetic driving body and the surface of the soundboard are substantially parallel, and the driving portion of the electromagnetic driving body itself does not emit sound. The musical sound device according to claim 1.

  As a result, the transmission loss of vibration from the drive portion of the electromagnetic drive body to the soundboard decreases as the spacing interval, that is, the size (height / length) of the connecting member decreases. On the contrary, the greater the separation distance, that is, the size (height / length) of the connecting member, the less the vibration of the drive part of the electromagnetic driving body and the soundboard collide with each other, and the occurrence of abnormal vibration / abnormal sound. Less.

  Further, if the number of connecting members is reduced, the distance between the connecting members is widened and the vibration amplitude of the drive portion of the electromagnetic driving body is increased. Collisions between the parts and the soundboard are avoided. On the other hand, if the number of connecting members increases, the distance between the connecting members becomes narrow and the vibration amplitude of the drive portion of the electromagnetic driving body decreases, so that the spacing distance, that is, the height / size of the connecting member decreases. However, the collision between the drive part and the soundboard can be avoided.

  Further, since the drive part of the substantially parallel electromagnetic driving body and the soundboard are not in close contact with each other, abnormal resonance and abnormal vibration between them are prevented. Furthermore, since the drive part of the electromagnetic driving body itself does not radiate sound, it is not necessary to consider the sound generated from the connecting member when radiating the sound, and it is also necessary to consider the sound generated from the driving part of the electromagnetic driving body. Therefore, only the sound generated from the soundboard needs to be considered, and analysis and analysis of the sound generated from the entire musical sound device becomes easy.

[3] A plurality of the connecting members are arranged, the connecting members have the same shape, the same size, and the same material, and the surface of the driving portion of the electromagnetic driving body facing the soundboard is point-symmetric with respect to the center thereof. Or having a line-symmetric shape with respect to the center line thereof, wherein the plurality of connecting members are arranged at positions that are point-symmetric or line-symmetric with respect to the drive portion of the electromagnetic drive body. The musical sound device according to claim 1 or 2. Thereby, the vibration of the drive part of an electromagnetic drive body is uniformly transmitted to a soundboard.

[4] The musical sound device according to [1], [2] or [3], wherein the outer side surface of the connecting member is dome-shaped or tapered, and the size of the upper surface is smaller than the size of the bottom surface. As a result, the driving portion of the electromagnetic driving body is less likely to abut or collide with the upper surface of the connecting member, and abnormal noise / abnormal vibration is eliminated / reduced. The driving / vibration / displacement of the driving portion of the electromagnetic driving body is efficiently transmitted to the soundboard through the dome-shaped or tapered connecting member without being attenuated.

[5] The connecting member is bonded to the soundboard, and the drive portion of the electromagnetic driving body is fixed to the connecting member with a fixing tool. The fixing tool is built in the connecting member and is not exposed on the surface of the soundboard. 5. The musical sound device according to claim 1, wherein the musical sound device does not penetrate the soundboard or contact the soundboard. As a result, the fixing tool can be covered from the outside, the driving / vibration / displacement of the driving portion of the electromagnetic driving body is not adversely affected, and the fixing tool does not contact or penetrate the sound board, so that the sound board is abnormal. There is no sound.

[6] The drive part of the electromagnetic driving body is fixed to the connecting member with a fixing tool, and the thickness of the connecting member is larger than the thickness of the fixing tool, and the length of the connecting member and the thickness of the driving part are The total is larger than the length of the fixing tool, and the spacing between the drive portion of the electromagnetic driving body and the soundboard is equal to the length of the connecting member. Or the musical tone apparatus of 5. Thereby, the fixing tool can be covered from the outside, and the vibration / drive / displacement of the drive part of the electromagnetic drive body is not adversely affected.

[7] The musical sound device according to claim 1, 2, 3, 4, 5 or 6, wherein the soundboard extends in a horizontal direction and a plurality of soundboards are arranged vertically. . As a result, the sound generators from each soundboard are arranged vertically, and each sound is a plane wave, so that for each sound, the position of the ear is shifted left and right or up and down. It is difficult to feel the difference in sound pressure between the ears of the ears, the position of the sound image does not shift, and there is no sense of incongruity in hearing. Even if an abnormal sound occurs, it is felt as a difference in sound pressure between the left and right ears. This abnormal sound is not noticeable.

[8] The musical instrument is a keyboard musical instrument, and the musical tone signal includes a musical tone signal of a soundboard in addition to a string itself, a tube itself, and a percussion part of the musical instrument. The musical sound device according to 3, 4, 5, 6 or 7. Thereby, the sound of the soundboard itself can be heard on the soundboard, and the sound of the soundboard can be made natural.

[9] The soundboard is flat or curved, has the same thickness or a different thickness, and a plurality or a single soundbar is joined to the back side. The musical sound device according to 3, 4, 5, 6, 7 or 8. Thereby, each sound board becomes difficult to resonate.

  By separating the drive portion of the electromagnetic drive body and the soundboard, vibrations of the drive portion and the vibration of the soundboard do not collide, and abnormal vibration / abnormal sound is prevented. A plurality of dome-shaped or truncated cone-shaped connecting pieces 21 are bonded on the sound board 1, and the diaphragm 13 of the electromagnetic drive unit 11 is fixed on the connecting pieces 21 with bolts 25, nuts 23, and washers 27. The

  The connecting pieces 21 are of the same shape, the same size, and the same material, and are arranged at point-symmetrical or line-symmetrical positions with respect to the center of the diaphragm 13 so that vibrations of the diaphragm 13 are uniformly transmitted to the soundboard 1. Is done. Since the size of the upper surface of the connecting piece 21 is smaller than the size of the bottom surface, the diaphragm 13 is less likely to collide with the upper surface of the connecting piece 21 and the abnormal sound is eliminated. The vibration of the diaphragm 13 is efficiently transmitted to the soundboard 1 through the dome-shaped or tapered coupling pieces 21.

A plurality of soundboards 1 are shown. The attachment structure to the soundboard 1 ... of the electromagnetic drive unit 11 is shown. The attachment structure to the soundboard 1 ... of the electromagnetic drive unit 11 is shown. The attachment structure to the soundboard 1 ... of the electromagnetic drive unit 11 is shown. Another embodiment of the diaphragm 13 and the connecting piece 21 of the electromagnetic drive unit 11 is shown. Another embodiment of the diaphragm 13 and the connecting piece 21 of the electromagnetic drive unit 11 is shown.

Explanation of symbols

1 ... sound board, 5 ... frame board, 6 ... sound stick,
11 ... Electromagnetic drive unit (electromagnetic drive body),
12 ... Body case, 13 ... Diaphragm (drive part),
21 ... Connecting piece (connecting member), 22 ... Hole,
23 ... Nut (fixing tool), 24 ... Through hole,
25 ... bolt (fixing tool), 26 ... head,
27 ... Washer.

Claims (7)

An electromagnetic drive that converts a musical sound signal composed of multiple types of musical sounds into a mechanical change and drives the soundboard of the instrument to emit sound;
A connecting member that separates the drive portion of the electromagnetic drive body from the soundboard and connects the drive portion and the soundboard, the connection member contacting only a part of the surface of the drive portion. A musical sound device that features it. The distance between the drive portion of the electromagnetic drive body and the soundboard is 1 to 50 times, preferably 1.5 to 25 times the maximum drive displacement of the drive portion and / or the soundboard. Preferably 2 to 15 times, more preferably 2.5 to 10 times, even more preferably 3 to 5 times,
There are a plurality of the connecting members, and as the interval between the plurality of connecting members increases, the spacing interval is increased.
The surface of the driving portion of the electromagnetic driving body and the surface of the soundboard are substantially parallel,
2. The musical sound device according to claim 1, wherein the driving portion of the electromagnetic driving body does not emit sound. A plurality of the connecting members are arranged, and the connecting members have the same shape, the same size, and the same material.
The surface of the driving part of the electromagnetic driving body facing the soundboard is point-symmetric with respect to the center or line-symmetric with respect to the center line.
The musical sound device according to claim 1 or 2, wherein the plurality of connecting members are arranged at point-symmetrical or line-symmetrical positions with respect to a driving portion of the electromagnetic driving body.   4. The musical sound device according to claim 1, wherein the outer surface of the connecting member is dome-shaped or tapered, and the size of the upper surface is smaller than the size of the bottom surface.   The connecting member is bonded to the soundboard, and the drive portion of the electromagnetic driving body is fixed to the connecting member with a fixing tool. The fixing tool is built in the connecting member, and is not exposed on the surface of the soundboard. 5. The musical sound device according to claim 1, wherein the musical sound device does not penetrate the plate or contact the soundboard. The driving part of the electromagnetic driving body is fixed to the connecting member with a fixing tool, and the thickness of the connecting member is larger than the thickness of the fixing tool, and the total length of the connecting member and the thickness of the driving part is Larger than the length of this fastener,
6. The musical sound device according to claim 1, wherein a distance between the driving portion of the electromagnetic driving body and the soundboard is equal to a length of the connecting member.   7. The musical sound device according to claim 1, wherein the soundboard extends in a horizontal direction, and a plurality of soundboards are arranged vertically.

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