JP2008298992A - Electronic keyboard musical instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic keyboard musical instrument capable of obtaining musical sound with good quality similar to an acoustic piano, and a desired sound volume, by fully vibrating a sound board. <P>SOLUTION: The electronic keyboard musical instrument 1 in which musical sound signals are generated based on a key pressing state of a plurality of keys 13, and the musical sound is generated based on the generated musical sound signals, includes: the sound board 23; a vibrating section 27a; a vibrator 27 for generating musical sound by vibrating the sound board 23 via the vibrating section 27a based on the musical sound signals; and a vibrator support means 30 for supporting the vibrating section 27a in a state in which the vibrating section 27a is pressed on the sound board 23. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electronic keyboard instrument that generates a musical sound by vibrating a soundboard.

  Conventionally, as this type of electronic keyboard instrument, for example, one disclosed in Patent Document 1 is known. This electronic keyboard instrument is a grand-type electronic piano and includes a soundboard similar to that of an acoustic grand piano. This sound board is made of a wooden board having a uniform thickness, has the same planar shape as a grand piano, and is provided horizontally. A vibration exciter for vibrating the sound board is attached to the upper surface of the sound board.

  When a key is pressed during performance, a musical sound signal based on the key pressed state is generated and output to the vibrator. Thereby, a musical tone is generated when the vibrator vibrates the soundboard. In this way, this electronic keyboard instrument, like an acoustic piano, generates a musical sound by vibrating the soundboard. A wide and wide musical tone can be obtained.

  As described above, in this electronic keyboard instrument, since the vibrator is directly attached to the soundboard, the weight (self-weight) of the vibrator always acts on the soundboard. Therefore, the vibration of the soundboard is hindered and tends to be insufficient, so that it is impossible to generate a high-quality musical tone and a desired volume.

  The present invention has been made to solve the above-described problems, and can sufficiently vibrate the soundboard, thereby obtaining a high-quality musical tone and a desired volume approximate to those of an acoustic piano. An object is to provide an electronic keyboard instrument that can be used.

JP 2007-47273 A

  In order to achieve the above object, an invention according to claim 1 is an electronic keyboard instrument that generates a musical tone signal based on a depressed state of a plurality of keys and generates a musical tone based on the generated musical tone signal. A vibration plate that has a sound board and a vibration unit, and generates a musical sound by vibrating the sound board through the vibration unit based on the musical sound signal, and the vibration unit And a vibration exciter support means for supporting the sound board while being pressed against the soundboard.

  According to this configuration, a musical sound is generated by vibrating the soundboard via the vibration unit of the vibration exciter based on the musical sound signal generated based on the depressed state of a plurality of keys. Since this vibrator is supported by the vibrator support means, unlike the conventional case where the vibrator is supported by the soundboard, the weight of the vibrator does not act on the soundboard. It does not inhibit the vibration. Moreover, since the vibration part of the vibrator is pressed by the sound board, the vibration of the vibrator can be sufficiently transmitted from the vibration part to the sound board. As described above, the soundboard can be sufficiently vibrated, and thereby, a high-quality musical sound and a desired sound volume with a spread and depth approximate to those of an acoustic piano can be obtained.

  According to a second aspect of the present invention, in the electronic keyboard instrument according to the first aspect, the exciter support means is provided at a distance from the soundboard, and an immobile support member that supports the exciter and the support. It is provided between the member and the vibrator, and has a pressing degree adjusting mechanism that adjusts the pressing degree of the vibrator to the soundboard.

  According to this configuration, the pressing degree of the vibrator to the soundboard can be adjusted by the pressing degree adjusting mechanism provided between the support member and the vibrator. If the degree of pressure of the vibrator on the soundboard is too low, the vibration of the vibrator is not sufficiently transmitted to the soundboard, and therefore the soundboard cannot be vibrated sufficiently. On the other hand, if the degree of pressing is too high, the vibrator cannot vibrate sufficiently, and the soundboard cannot be vibrated sufficiently. On the other hand, in the present invention, the pressing degree adjustment mechanism can appropriately adjust the pressing degree of the vibrator to the soundboard, and therefore sufficient vibration of the soundboard can be ensured.

  According to a third aspect of the present invention, in the electronic keyboard instrument according to the second aspect, the pressing degree adjusting mechanism has one end connected to the vibrator and the other end penetrating through a hole formed in the support member. And two lock nuts that lock the bolt with respect to the support member by being screwed to both sides of the support member of the bolt and being tightened with respect to the support member. To do.

  According to this configuration, since one end of the bolt is connected to the vibrator and the other end penetrates the hole of the support member, the soundboard can be moved by appropriately moving the bolt in the axial direction. It is possible to adjust the degree of pressing of the vibrator on the. Further, two lock nuts are screwed onto both sides of the bolt support member, and the bolt is locked to the support member by tightening these lock nuts against the support member. Accordingly, by locking the bolt at a position where a desired pressing degree of the vibrator is obtained, the vibrator can be supported while the pressing degree is maintained. Further, the pressing degree adjusting mechanism can be easily realized by a relatively simple configuration of the bolt and the two lock nuts.

  According to a fourth aspect of the present invention, in the electronic keyboard instrument according to the third aspect, the vibration exciter has a recess provided on the surface on the support member side, and one end of the bolt is in the axial direction of the bolt. The pressing degree adjusting mechanism is inserted between the bolt exciter and the lock nut on the exciter side, and is a pressing nut for pressing the exciter against the soundboard. Is further included.

  According to this configuration, one end of the bolt is inserted into the concave portion on the support member side of the vibrator so as to be movable in the axial direction of the bolt. Further, a pressing nut for pressing the vibrator against the soundboard is screwed into the bolt between the vibrator and the lock nut on the vibrator side. Therefore, the degree of pressing of the vibrator to the soundboard can be easily increased by turning the pressing nut in a predetermined direction and moving it to the soundboard side. On the other hand, the degree of pressing can be easily reduced by turning the pressing nut in the opposite direction to moving it away from the soundboard. As described above, the degree of pressing can also be adjusted by turning the pressing nut, and the fine adjustment can be easily performed.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. 1 and 2 show an upright electronic piano to which the present invention is applied. The electronic piano 1 (electronic keyboard instrument) is composed of a piano body 2 and a stand unit 3 that supports the piano body 2. On the left and right side surfaces of the piano body 2 and the stand unit 3, vertically long master plates 4, 4 are respectively attached so as to cover both.

  The exterior of the piano body 2 is between the left and right arms 5, 5, the horizontal shelf 6 and the top 7 that extend between the lower ends and the upper ends of the arms 5, 5, and the rear ends of the arms 5, 5. It is comprised with the backplate 8 etc. which cover. The piano body 2 is provided with a keyboard device 9, an operation panel 10, a middle / high tone speaker 11, a high tone speaker 12, and the like.

  The keyboard device 9 includes a keyboard 14 composed of a large number of keys 13 arranged in parallel in the left-right direction on the shelf board 6, and a hammer that is provided for each key 13 and rotates in conjunction with the depressed key 13 (see FIG. And a key sensor (not shown) that is provided for each key 13 and detects the key press information. The key 13 is mainly made of a wood material, is configured in substantially the same way as an acoustic upright piano key, and is rotatably supported at the center thereof. The key sensor is composed of a rubber switch or the like, and detects the presence / absence (on / off) of key pressing of the corresponding key 13 and the key pressing speed (velocity) via a hammer that rotates with the key pressing.

  The operation panel 10 is disposed above the keyboard 14, and includes an operation button and an operation lever for setting the tone, volume, sound effect, etc. of the electronic piano 1, a display for displaying the setting state thereof, and the like. Is provided.

  The middle / high tone speaker 11 is composed of four mid-range speakers, and mainly reproduces the middle and high pitch components of musical sounds. The sound emitting surface faces upward at the left and right rear ends of the piano body 2. Two are arranged in a state of being. The treble speaker 12 is composed of two dome tweeters, and mainly reproduces the treble component of the musical sound, and faces the horizontally long opening 17 above the keyboard cover 16 at the left and right ends of the upper part in the piano body 2. The sound emitting surface is arranged in a forward direction. Note that a mesh cover 17a is provided in front of the horizontally long opening 17, and the musical sound reproduced by the high-pitched speaker 12 is emitted through the mesh cover 17a satisfactorily.

  The stand unit 3 is assembled in a box shape by left and right end foundations 18 and 18, left and right side plates 19 and 19, a pedal base 21, a lower front plate 22, a soundboard 23, a stand top plate 24, and the like. The pedal base 21 is connected between the rear portions of the end bases 18 and 18 and extends in the left-right direction, and three pedals 25 are rotatably provided at the center thereof. A shelf support column 20 that supports the front end portion of the shelf board 6 from below is erected on the front end portion of the upper surface of each base 18. Each shelf support column 20 is connected to the upper surface of the corresponding rear side plate 19 by a sheet metal (not shown) extending in the front-rear direction on the upper surface thereof. The lower front plate 22 is provided so as to cover the front end of the space surrounded by the left and right side plates 19, 19, the pedal base 21 and the stand top plate 24. The soundboard 23 is fixed to the front surface of the driving device 26 attached along the outer periphery of the rear end portion of the space, and is provided so as to cover the back surface of the stand unit 3. In addition, a mesh cover 22 a having a horizontally long rectangular front surface is provided on the lower front plate 22.

  As shown in FIG. 2, on the front surface of the soundboard 23, an exciter 27 that is supported while being pressed against the soundboard 23 by an exciter support mechanism 30 described later is disposed. The vibration board 27 constitutes a soundboard speaker 28. Similar to the acoustic sound board of an acoustic upright piano, the sound board 23 is formed into a horizontally-oriented rectangular shape by joining together a plurality of strips made of spruce, for example. A plurality of sounding bars 29 are attached to the back of the sounding board 23. These sounding rods 29 are for increasing the transmission speed of vibration in the sounding plate 23, and are orthogonal to the joining direction of the plate members of the sounding plate 23 and extend obliquely in parallel with each other.

  The vibration exciter 27 is an electromagnetic type having vibration characteristics that vibrate in a predetermined frequency band (for example, 30 Hz to 2 kHz). The vibration exciter 27 faces the outside and imparts vibration to the sound board 23 in contact with the sound board 23. A vibration unit 27a (see FIG. 3) is provided. Further, a flange portion 27b protruding outward is provided on the outer peripheral surface of the vibrator 27. A plurality of (for example, four, 2 in FIG. 3B) formed at predetermined positions of the flange portion 27b. The vibrator 27 is supported by the vibrator support mechanism 30 (vibrator support means) through a screw hole 27c (only one is shown).

  The exciter support mechanism 30 connects the support plate 31 (support member) disposed at a distance in front of the soundboard 23 with the support plate 31 and the vibration exciter 27 and applies vibration to the soundboard 23. A pressing degree adjusting mechanism 32 that adjusts the pressing degree of the vibrator 27 is provided. The support plate 31 is made of a metal plate or the like extending in the vertical direction, and is fixed to the stand top plate 24 and the pedal base 21 at the upper end portion and the lower end portion, respectively. Further, holes 31 a for fixing bolts 33 described later of the pressing degree adjusting mechanism 32 are formed at a plurality of predetermined positions of the support plate 31.

  As shown in FIG. 3, the pressing degree adjusting mechanism 32 is configured by a plurality of sets (for example, four sets) including one bolt 33 and two lock nuts 34 and 34. Each set of bolts 33 is screwed into the screw hole 27c of the flange portion 27b of the vibrator 27 so as to be connected to the vibrator 27, and the shaft portion 33a of the bolt 33 penetrates the hole 31a of the support plate 31. Are arranged to be. Further, lock nuts 34, 34 are screwed onto both sides of the support plate 31 and are fastened to the support plate 31 to the shaft portions 33 a of the respective bolts 33. Thereby, each bolt 33 is locked to the support plate 31.

  The adjustment of the pressing degree of the vibrator 27 to the soundboard 23 by the pressing degree adjusting mechanism 32 configured as described above is performed as follows, for example. In order to increase the degree of pressing, among the lock nuts 34, 34 of each set, the lock nut 34 (hereinafter referred to as “front nut 34A”) far from the vibrator 27 is loosened, separated from the support plate 31, and then excited. The bolt 33 is moved to the soundboard 23 side (left side in FIG. 3) by turning a lock nut 34 (hereinafter referred to as “rear side nut 34 </ b> B”) close to the container 27 in a tightening direction with respect to the support plate 31. Accordingly, the vibrator 27 connected to the bolt 33 also moves to the soundboard 23 side. Thereafter, the front nut 34 </ b> A is tightened, and the bolt 33 is locked to the support plate 31. As described above, the degree of pressing of the vibrator 27 against the soundboard 23 is increased, and the vibrator 27 is held in this state. Conversely, to reduce the degree of pressing, the bolt 33 is moved to the support plate 31 side (right side in FIG. 3) by turning the rear nut 34B in the opposite direction. Along with this, the vibrator 27 also moves to the support plate 31 side. Thereafter, the front nut 34 </ b> A moved together with the bolt 33 is tightened, and the bolt 33 is locked to the support plate 31. Thus, the degree of pressing of the vibrator 27 against the soundboard 23 is lowered, and the vibrator 27 is held in that state.

  As described above, by appropriately adjusting the degree of pressing of the vibrator 27 to the soundboard 23, the soundboard 23 can be sufficiently vibrated via the vibration portion 27a of the vibrator 27. The exciter 23 is supported in a ready state. When the key 13 is pressed, the vibrator 23 is driven by a drive signal output from a musical tone generator (not shown) built in the piano body 2 to vibrate the soundboard 23. Therefore, it is possible to generate a musical tone and to generate a musical tone mainly from a low range to a middle range.

  FIG. 4 shows a modification of the vibrator and the pressing degree adjusting mechanism. The vibration exciter 40 has a vibration exciter 40a similar to the vibration exciter 27, and a screw hole 40b (concave portion) is formed at the center of the surface on the support plate 31 side. Further, in the vibrator 40, unlike the vibrator 27, the flange portion is omitted. The screw hole 40b of the vibration exciter 40 is provided in advance for assembling the vibration exciter 40 itself.

  On the other hand, the pressing degree adjusting mechanism 41 includes one bolt 33, two lock nuts 34 and 34, and one pressing nut 35. The bolt 33 is arranged in the direction opposite to that of the pressing degree adjusting mechanism 32. That is, the bolt 33 passes through the hole 31 a of the support plate 31, and the shaft portion 33 a is screwed into the screw hole 40 b of the vibrator 40. Both the lock nuts 34, 34 are screwed into the shaft portions 33 a of the bolts 33 on both sides of the support plate 31 and are fastened to the support plate 31, similarly to the pressing degree adjusting mechanism 32. Further, a pressing nut 35 is screwed onto the shaft portion 33 a of the bolt 33 between the vibrator 40 and the rear nut 34 </ b> B and is fastened to the vibrator 40.

  The adjustment of the pressing degree of the vibration exciter 40 to the soundboard 23 is performed by the pressing degree adjusting mechanism 41 configured as described above, for example, as follows. In order to increase the degree of pressing, the lock nuts 34 and 34 are slightly loosened, and then the bolt 33 is rotated together with the lock nuts 34 and 34 in a predetermined direction so as to be loosened with respect to the vibrator 40. In this case, the bolt 33 does not move with respect to the support plate 31, whereas the vibrator 40 moves to the soundboard 23 side. Thereafter, the lock nuts 34 and 34 and the pressing nut 35 are tightened. Thus, the degree of pressing of the vibrator 40 against the soundboard 23 is increased, and the vibrator 40 is held in that state. On the other hand, in order to reduce the degree of pressing, the pressing nut 35 is loosened and separated from the vibrator 40, and both the lock nuts 34, 34 are slightly loosened, and then the bolt 33 and the two lock nuts 34, 34 are Turn in the opposite direction. Thereby, the bolt 33 is screwed into the screw hole 40b, and accordingly, the vibrator 40 moves to the support plate 31 side. Thereafter, the lock nuts 34 and 34 and the pressing nut 35 are tightened. Thus, the degree of pressing of the vibrator 40 against the soundboard 23 is lowered, and the vibrator 40 is held in that state.

  Further, instead of the screw hole 40b of the vibration exciter 40, a flaw hole (concave portion) into which the shaft portion 33a of the bolt 33 is movably inserted in the axial direction may be formed in the vibration exciter 40. In this case, when the degree of pressing is increased, the pressing nut 35 is turned in a direction to be tightened with respect to the vibrator 40 in a state where the bolt 33 is locked to the support plate 31 by both lock nuts 34, 34. Accordingly, the pressing degree can be easily increased by moving the vibrator 40 toward the soundboard 23 side while pressing the vibrator 40 with the pressing nut 35. Conversely, when the pressing degree is lowered, the pressing degree can be easily lowered by turning the pressing nut 35 in the opposite direction. As described above, fine adjustment of the degree of pressing can be easily performed by turning the pressing nut 35.

  As described above, according to this embodiment, since the vibrators 27 and 40 are supported by the vibrator support mechanism 30, unlike the conventional case, the weights of the vibrators 27 and 40 are different from each other. And the vibration of the soundboard 23 is not hindered. Moreover, since the vibration parts 27a and 40a of the vibrators 27 and 40 are pressed by the sound board 23, the vibrations of the vibrators 27 and 40 are sufficiently transmitted from the vibration parts 27a and 40a to the sound board 23. be able to. As described above, the soundboard 23 can be sufficiently vibrated, whereby a high-quality musical sound and a desired sound volume with a spread and depth similar to an acoustic piano can be obtained.

  Moreover, since the pressing degree of the vibrators 27 and 40 to the sound board 23 can be appropriately adjusted by the pressing degree adjusting mechanisms 32 and 41, sufficient vibration of the sound board 23 can be ensured. Further, the pressing degree adjusting mechanisms 32 and 41 can be easily realized by a relatively simple configuration including the bolt 33, the lock nut 34, and the pressing nut 35.

  In addition, this invention can be implemented in various aspects, without being limited to the said embodiment described. For example, in the embodiment, only one vibrator 27 and 40 is used, but the present invention is not limited to this, and a plurality of vibrators having the same or different vibration characteristics are pressed against the soundboard 23. In such a state, it may be arranged in an appropriate layout. When arranging a plurality of vibrators, in addition to supporting the vibrators 27 and 40 with the above-described vibrator support mechanism 30, a spring is interposed between the support plate and the vibrator, The vibrator may be pressed against the soundboard 23 by the biasing force of the spring. In this case, the vibration of the sound exciter is absorbed by the spring, so that the frequency band of the vibration of the soundboard by the exciter shifts to a lower side. The range is expanded, so that a wider range of musical tones can be obtained.

  In the embodiment, the support plate 31 of the vibrator support mechanism 30 is fixed to the stand top plate 24 and the pedal base 21, but it is also possible to fix the support plate 31 to only one of the both 24 and 21. Further, in order to prevent the minute vibrations when the soundboard 23 vibrates from propagating to the support plate 31, a damper member is provided between the support plate 31 and the stand top plate 24 or the pedal base 21 that supports the support plate 31. May be interposed.

  Further, the stand top plate 24 may be omitted, and the support plate 31 may be attached to the shelf plate 6. Further, the lower front plate 22 may be used as a support plate. In these cases, the stand top plate 24 and the support plate 31 can be omitted, and accordingly, the number of parts and the manufacturing cost can be reduced. The detailed configuration of the electronic piano 1 shown in the embodiment is merely an example, and can be appropriately changed within the scope of the gist of the present invention.

1 is a perspective view showing an upright electronic piano according to an embodiment of the present invention. It is a figure which shows the electronic piano of FIG. 1, (a) Rear view, (b) The internal structure figure of the cross section along an AA line. It is an enlarged view which shows the circumference | surroundings of a vibrator. It is an enlarged view which shows the modification of a vibrator and a press degree adjustment mechanism.

Explanation of symbols

1 Electronic piano (electronic keyboard instrument)
13 Key 23 Soundboard 27 Exciter 27a Excitation unit 28 Soundboard speaker 30 Exciter support mechanism (exciter support means)
31 Support plate (support member)
31a Hole 32 Pressing degree adjusting mechanism 33 Bolt 33a Shaft 34 Lock nut 35 Pressing nut 40 Exciter 40a Exciting part 40b Screw hole (concave part)
41 Pressing degree adjustment mechanism

Claims (4)

An electronic keyboard instrument that generates a musical sound signal based on a depressed state of a plurality of keys and generates a musical sound based on the generated musical sound signal,
Soundboard,
A vibration exciter that generates a musical sound by oscillating the soundboard through the vibration unit based on the musical sound signal;
A vibrator support means for supporting the vibrator in a state in which the vibrator is pressed against the soundboard;
An electronic keyboard instrument characterized by comprising: The vibrator support means is
A stationary support member provided at a distance from the soundboard and supporting the vibrator;
A pressing degree adjusting mechanism that is provided between the support member and the vibrator and adjusts the pressing degree of the vibrator to the soundboard;
The electronic keyboard instrument according to claim 1, comprising: The pressing degree adjusting mechanism is
A bolt having one end connected to the vibrator and the other end penetrating a hole formed in the support member;
Two lock nuts that lock the bolt with respect to the support member by being screwed to both sides of the support member of the bolt and being tightened with respect to the support member;
The electronic keyboard instrument according to claim 2, comprising: The vibrator has a recess provided on the surface on the support member side,
The one end of the bolt is inserted into the recess so as to be movable in the axial direction of the bolt,
The pressing degree adjusting mechanism is screwed between the exciter of the bolt and the lock nut on the exciter side, and a pressing nut for pressing the exciter against the soundboard, The electronic keyboard instrument according to claim 3, further comprising:

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