JP2008299169A - Speaker unit for electronic musical instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker unit for an electronic musical instrument, capable of obtaining musical sound with excellent quality similar to acoustic musical sound, which can be commonly used for various types of musical instruments. <P>SOLUTION: The speaker unit 1 built in the electronic musical instrument 21, which generates the electronic musical sound according to a musical signal generated based on an operation state of an operation element 23a for performance, comprises: a speaker box 2 including an aperture 2a; a sound board 3 which is provided in the speaker box 2 in one unit so as to get in the aperture 2a; and a vibrator 8 provided on the sound board 3, which is driven according to the musical sound signal, and which generates a musical sound by vibrating the sound board 3. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a loudspeaker unit for an electronic musical instrument that is incorporated in an electronic musical instrument and generates a musical sound with a performance.

  As a conventional speaker unit for an electronic musical instrument, for example, one disclosed in Patent Document 1 is known. This speaker unit includes a speaker box and a cone speaker provided in the speaker box. An opening is formed in the front plate of the speaker box. The cone speaker is attached to the back surface of the front plate so that the sound emitting surface faces the opening.

  Further, the back plate of the speaker box is formed of a diaphragm. A groove is formed in the rear end portion of the inner wall surface of the speaker box in the entire circumferential direction, and the diaphragm is attached in a state in which the peripheral edge portion is fitted in the groove with play. This diaphragm has the same configuration as the acoustic piano soundboard, and is made of wood.

  In this speaker unit, a musical sound is generated when the cone speaker vibrates. Further, the vibration of the cone speaker is transmitted to the diaphragm, and the diaphragm vibrates in the groove, so that a musical sound is generated from the diaphragm and combined with the musical sound generated by the cone speaker. By releasing such a composite sound from the speaker unit, a musical sound approximating an acoustic musical sound can be obtained.

  However, since the diaphragm vibrates indirectly according to the vibration of the cone speaker as described above, the diaphragm cannot sufficiently vibrate, and sufficient sound volume cannot be secured. In that case, since the musical sound generated by the cone speaker occupies most of the composite sound, the sound quality is different from that of the acoustic musical sound.

  The present invention has been made in order to solve the above-described problems, and can obtain a high-quality musical sound approximated by an acoustic musical sound, and can be used in common for many types of electronic musical instruments. An object of the present invention is to provide a speaker unit for an electronic musical instrument.

Japanese Patent No. 3795138

  In order to achieve the above object, a speaker unit according to claim 1 of the present application is incorporated in an electronic musical instrument and generates a musical sound in accordance with a musical sound signal generated based on an operating state of a performance operator. A speaker unit for an electronic musical instrument, having a speaker box having an opening, a soundboard integrally provided in the speaker box so as to face the opening, and provided on the soundboard and driven according to a musical sound signal, And a vibration exciter that generates a musical sound by vibrating the soundboard.

  The speaker unit is incorporated in an electronic musical instrument, and a soundboard is integrally provided in the speaker box, and a vibration exciter is provided on the soundboard. When an operator for playing an electronic musical instrument is operated, a musical sound signal is generated based on the operation state, and an exciter is driven in accordance with the musical sound signal to vibrate the soundboard. Is generated and sound is emitted through the opening of the speaker box.

  In this way, the soundboard is vibrated directly with the vibrator, and the musical sound is emitted from the entire surface of the soundboard. You can get good quality music with In addition, since the soundboard and the vibrator are built in the speaker box and unitized, the speaker unit can be used in common for many types of electronic musical instruments. As a result, it is not necessary to design and manufacture a soundboard speaker including a soundboard and a vibrator for each type of electronic musical instrument, thereby reducing the manufacturing cost of the electronic musical instrument.

  The invention according to claim 2 is the speaker unit for an electronic musical instrument according to claim 1, further comprising a cover that covers the opening of the speaker box.

  According to this configuration, since the opening of the speaker box is covered with the cover, for example, when there are undesired external parts such as screws for mounting on the surface of the soundboard, such parts are covered with the cover. It can be easily hidden and the appearance of the electronic musical instrument can be improved. Or, if a transparent cover is used, the soundboard etc. in the speaker box can be seen from the outside through the cover. It is also possible to enhance the design of electronic musical instruments.

  According to a third aspect of the present invention, in the speaker unit for an electronic musical instrument according to the first or second aspect, the vibration unit is interposed between the soundboard and the speaker box, and transmits vibration from the soundboard to the speaker box. It further comprises a damper for suppressing.

  According to this configuration, the vibration of the soundboard is attenuated by the interposed damper and then transmitted to the main body case of the electronic musical instrument through the speaker box. Thereby, generation | occurrence | production of noises, such as a rattling sound resulting from a vibration of a speaker box or a main body case, is prevented. Further, if the soundboard is rigidly connected to the speaker box, the vibration is likely to be hindered, and particularly when the soundboard is small in size, the sound volume is likely to be insufficient. According to the present invention, the soundboard is attached to the speaker box via the damper, and the soundboard is allowed to vibrate at the attachment portion, so that the soundboard vibrates sufficiently to ensure sufficient sound volume. can do.

  According to a fourth aspect of the present invention, in the speaker unit for an electronic musical instrument according to the third aspect, the damper has a mounting concave portion into which an end portion of the soundboard is fitted, and a speaker at a portion opposite to the mounting concave portion. Adhering to the wall surface of the box, adjoining the damper along the wall surface of the speaker box, screwed to the mounting member via the damper and soundboard, and fixed to the sounding plate And a screw to be further provided.

  According to this configuration, the end portion of the soundboard is fitted into the mounting recessed portion of the damper, and the damper is in close contact with the wall surface of the speaker box at the portion opposite to the mounting recessed portion. As described above, since there is no gap between the damper and the soundboard and between the damper and the wall surface of the speaker box, the speaker box can be sealed, thereby improving the acoustic characteristics of the speaker unit. be able to.

  According to a fifth aspect of the present invention, in the electronic musical instrument speaker unit according to the third aspect, the damper has a mounting recess into which an end portion of the soundboard is fitted, and a screw mounting hole extending along the wall surface of the speaker box. And is in close contact with the wall surface of the speaker box at the opposite side of the mounting recess, and is adjacent to the damper along the cylindrical wall surface of the speaker box and the cylindrical bush attached to the screw mounting hole. The fixing device further includes a fixed mounting member, and a screw that passes through the bush and is screwed into the mounting member, thereby fixing the damper to the mounting member.

  According to this configuration, the end portion of the soundboard is fitted into the mounting recessed portion of the damper, and the damper is in close contact with the wall surface of the speaker box at a portion opposite to the mounting recessed portion, as in the fourth aspect. Yes. Therefore, similarly to the fourth aspect, it is possible to secure the sealing property of the speaker box and improve the acoustic characteristics of the speaker unit.

  The damper is fixed to the attachment member by passing a screw through a bush attached to the screw attachment hole and screwing it into the attachment member. That is, since the soundboard is in contact with only the damper and not in contact with other components, the soundboard is more likely to vibrate, and a larger volume can be secured.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a compact electronic piano 21 incorporating a speaker unit 1 according to the present invention. In the following description, the front side of the piano as viewed from the performer side is described as “front”, and the back side is described as “rear”.

  As shown in the figure, the electronic piano 21 includes a piano body 22 and a stand unit 31 that supports the piano body 22. A keyboard 23 composed of a large number of keys 23 a arranged in the left-right direction is arranged at the front of the piano body 22, and an operation panel 24 is arranged at the rear. Various switches 24a and a display 24b are arranged on the operation panel 24. The switch 24a is constituted by, for example, a demo performance switch or a tone color selection switch.

  Each key 23a is provided with a key switch (not shown) that detects the presence / absence of key depression and the key depression speed as the key depression state of the key 23a. In addition, the piano body 22 is provided with a musical sound generating device including a CPU, a sound source circuit, an amplifier, and the like (all not shown), and this musical sound generating device is in a depressed state of the detected key 23a. In response to this, a musical tone signal is generated.

  The stand unit 31 includes left and right leg plates 32 and 32 and the speaker unit 1. The leg plates 32, 32 extend downward from the left and right ends of the piano body 22. The speaker unit 1 is disposed and attached between the leg plates 32, 32 just below the piano body 22.

  As shown in FIGS. 2 and 3, the speaker unit 1 includes a speaker box 2, a soundboard speaker 20 including a soundboard 3 and a vibrator 8 built in the speaker box 2, and a soundboard 3 that is connected to the speaker box 2. And a soundboard mounting portion 11 for mounting on the soundboard. The speaker box 2 is formed horizontally by left and right side plates 4, 4, a top plate 5, a bottom plate 6 and a back plate 7 and has an opening 2a at the front end.

  The soundboard mounting portion 11 is provided slightly in front of the center of the speaker box 2, and has a splint 12 attached to an inner wall surface (hereinafter simply referred to as “inner wall surface”) 2 b of the speaker box 2. A damper 13 attached to the tree 12 is provided. The splint 12 has a rectangular cross-sectional shape, extends along the side plates 4, 4, the top plate 5 and the bottom plate 6 over the entire circumferential direction of the inner wall surface 2 b, and is fixed to the speaker box 2 by, for example, bonding. ing.

  The damper 13 is made of an elastic body such as foamed urethane or rubber. As shown in FIG. 4, the damper 13 is adjacent to the front side of the splint 12 and extends along the splint 12 over the entire circumferential direction of the inner wall surface 2b, and is in close contact with the inner wall surface 2b. The damper 13 is formed with a mounting groove 13a over the entire inner peripheral surface thereof. The depth of the mounting groove 13a is about 2/3 of the length of the damper 13 in a direction perpendicular to the inner wall surface 2b, and the peripheral portion of the soundboard 3 is fitted into the mounting groove 13a. .

  The sound board 3 is formed by joining together a plurality of strips made of sprue, for example, like the sound board of an acoustic piano. A plurality of sounding bars 3 a are attached to the front surface of the sounding board 3. These sounding bars 3a are for increasing the transmission speed of vibration in the sounding board 3, and extend obliquely in parallel with each other.

  The soundboard 3 and the damper 13 are attached to the splint 12 by a plurality of fixing screws 14. The plurality of fixing screws 14 pass through the damper 13 and the soundboard 3 at a plurality of predetermined positions in the circumferential direction and are screwed into the splint 12, whereby the soundboard 3 is attached via the damper 13. It is fixed to the tree 12. With the above configuration, the soundboard 3 is attached to the speaker box 2 together with the damper 13 in a sealed state, and faces the opening 2 a of the speaker box 2.

  A vibration exciter 8 is attached to a predetermined position on the back of the soundboard 3. The vibration exciter 8 is, for example, an electromagnetic type, and is driven when a musical tone signal generated by a musical tone generating device is input in response to a key depression, and vibrates the soundboard 3 in accordance with the musical tone signal. Thereby, a musical tone having a volume corresponding to the pitch and the key pressing speed corresponding to the pressed key 23a is generated and emitted from the entire surface of the soundboard 3.

  The front portion of the speaker box 2 is covered with a cover 9. The cover 9 is, for example, mesh-shaped, and serves to conceal the soundboard 3 and the fixing screw 14 inside the speaker box 2 by covering the opening 2a.

  As described above, according to the speaker unit 1 of the present embodiment, the soundboard 3 is directly vibrated by the vibrator 8, and the musical sound is emitted from the entire surface of the soundboard 3. Unlike the case of indirectly vibrating the sound, it is possible to obtain a high-quality musical sound having a sufficient spread and volume.

  Further, since the opening 2a of the speaker box 2 is covered with the cover 9, it is possible to easily hide parts that are not preferable in appearance such as the fixing screw 14 with the cover 9, and to improve the appearance of the electronic piano 21. .

  The vibration of the soundboard 3 is attenuated by the interposed damper 13 and then transmitted to the piano main body 22 and the like via the speaker box 2. Thereby, generation | occurrence | production of noises, such as a rattling sound resulting from the vibration of the speaker box 2 or the piano main body 22, can be prevented. In addition, since the soundboard 3 is attached to the speaker box 2 via the damper 13 and the soundboard 3 is allowed to vibrate in the soundboard attachment portion 11, it is sufficient that the soundboard 3 vibrates sufficiently. Can be secured.

  In addition, since there is no gap between the damper 13 and the soundboard 3 and between the damper 13 and the inner wall surface 2b, the sealing performance of the speaker box 2 can be secured, and thereby the sound of the speaker unit 2 can be secured. Characteristics can be improved.

  FIG. 5 shows a modification of the soundboard mounting portion described above. In the soundboard mounting portion 15 of this modified example, the length of the damper 16 in the direction orthogonal to the inner wall surface 2b is larger and the depth of the mounting groove 16a is shallower than the damper 13 described above. ing. Further, a plurality of screw mounting holes 16b (only one is shown) parallel to the inner wall surface 2b are formed at a plurality of predetermined positions in the circumferential direction at a portion near the inner wall surface 2b of the damper 16.

  A bush 17 is attached to each screw attachment hole 16b. The bush 17 is made of metal or resin and is formed in a cylindrical shape. Further, flanges 17 a and 17 a that protrude outward are formed at both ends of the bush 17. Such a bush 17 is attached to the damper 16 in close contact with the wall surface of the screw mounting hole 16b. The fixing screw 14 is passed through the bush 17 from the front and is screwed into the splint 12. Thereby, the damper 16 is fixed to the splint 12 via the bush 17.

  As described above, in the soundboard mounting portion 15, the soundboard 3 contacts only the damper 16 and does not contact the fixing screw 14 and the bush 17. Therefore, by using the soundboard mounting portion 15, the soundboard 3 is more likely to vibrate, and a larger sound volume can be secured.

  FIG. 6 shows an example in which the above-described speaker unit 1 is incorporated in an upright electronic piano. The electronic piano 31 includes a piano body 32 and a stand unit 33 that supports the piano body 32. Parent plates 34 and 34 are respectively attached to the left and right side surfaces of the piano body 32 and the stand unit 33 so as to cover them.

  The exterior of the piano body 32 is composed of left and right arms 35, 35, a shelf plate 36 and a top plate 37 that extend horizontally between the lower ends and upper ends of the arms 35, 35, respectively. The piano body 32 is provided with a keyboard device 39 having a large number of keys 39a, an operation panel 40 for setting the tone, volume, sound effect, etc. of the electronic piano 31.

  The stand unit 33 includes left and right end supports 38 and 38, left and right side plates 39 and 39 (only one is shown), a pedal base 41, a lower front plate 42, a back plate (not shown), a speaker unit 1 and the like. Assembled into a shape. The speaker unit 1 is disposed and attached between the left and right side plates 39, 39 just below the piano body 32. Further, the pedal base 41 is provided between the wife bases 38 and 38 and extends in the left-right direction, and three pedals 46 are provided at the center thereof. The lower front plate 42 and the back plate are provided so as to cover the front end and the rear end of the space surrounded by the left and right side plates 39, 39, the pedal base 41, and the speaker unit 1, respectively.

  As described above, since the speaker unit 1 is unitized, the speaker unit 1 can be commonly used for the upright electronic piano 31. As a result, it is not necessary to design and manufacture the soundboard speaker 20 including the soundboard 3 and the vibrator 8 for each electronic piano type, thereby reducing the manufacturing cost of the electronic piano.

  In addition, this invention can be implemented in various aspects, without being limited to the embodiment described above. For example, the embodiment is an example in which a mesh-shaped cover is used, but for example, the sound board may be made of a decorative finish and the cover may be made of transparent acrylic, etc. It can be used as a design to enhance the design of an electronic piano. In this case, the cover may be omitted.

  Furthermore, although the embodiment is an example in which the speaker unit according to the present invention is incorporated in an electronic piano, it is needless to say that the embodiment may be applied to other types of electronic musical instruments, for example, percussion type electronic musical instruments. In addition, it is possible to appropriately change the detailed configuration within the scope of the gist of the present invention.

It is a perspective view which shows the compact type electronic piano incorporating the speaker unit by this invention. It is a perspective view which shows the speaker unit of FIG. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. It is a partial expanded sectional view which shows a soundboard attachment part. It is a partial expanded sectional view which shows the modification of a sound board attaching part. It is a perspective view which shows the upright type | mold electronic piano incorporating the speaker unit of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Speaker unit 2 Speaker box 2a Opening 3 Sound board 8 Exciter 9 Cover 12 Attachment (attachment member)
13 Damper 13a Mounting groove (Mounting recess)
14 Fixing screw (screw)
16 Damper 16a Mounting groove (Mounting recess)
16b Screw mounting hole 17 Bush 21 Electronic piano (electronic musical instrument)
23a Key (operator)
31 Electronic piano (electronic musical instrument)
39a Key (operator)

Claims (5)

A speaker unit for an electronic musical instrument that generates a musical sound in response to a musical sound signal that is incorporated in an electronic musical instrument and is generated based on an operation state of a performance operator,
A speaker box having an opening;
A soundboard integrally provided in the speaker box so as to face the opening;
A vibration exciter that is provided on the soundboard and is driven according to the musical sound signal to generate a musical sound by vibrating the soundboard;
A speaker unit for an electronic musical instrument, comprising:   The speaker unit for an electronic musical instrument according to claim 1, further comprising a cover that covers the opening of the speaker box.   3. The electron according to claim 1, further comprising a damper interposed between the soundboard and the speaker box for suppressing transmission of vibration from the soundboard to the speaker box. Speaker unit for musical instruments. The damper has a mounting recess into which an end of the soundboard is fitted, and is in contact with the wall surface of the speaker box at a portion opposite to the mounting recess.
An attachment member that is adjacent to the damper along the wall surface of the speaker box and is fixed to the wall surface;
A screw that is screwed into the mounting member via the damper and the soundboard, and fixes the soundboard to the mounting member;
The speaker unit for an electronic musical instrument according to claim 3, further comprising: The damper has a mounting recess into which an end of the soundboard is fitted, a screw mounting hole extending along the wall surface of the speaker box, and a wall surface of the speaker box at a portion opposite to the mounting recess. In contact with
A cylindrical bush attached to the screw mounting hole;
An attachment member that is adjacent to the damper along the wall surface of the speaker box and is fixed to the wall surface;
A screw that passes through the bush and is screwed into the mounting member to secure the damper to the mounting member;
The speaker unit for an electronic musical instrument according to claim 3, further comprising:

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