JP2012145803A - Electronic keyboard instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To emit sound backward widely and evenly, and to transmit sound to a player efficiently.SOLUTION: In the inside of a musical instrument body 10 surrounded by a top board 12, a back board 13, and lateral boards 39 on the left and right sides, a surface speaker unit 30 is disposed on a rear part 10b of the musical instrument body 10. The surface speaker unit 30 is composed of a frame body and a surface speaker part composed of an electrostatic speaker. The surface speaker unit 30 curves to project backward in the plane view. Sound from the surface speaker unit 30 is emitted backward through a small hole of the back board 13. In addition, the sound is emitted to the side of a player (forward) through a first aperture 15, a second aperture 17, and gaps of each place.

Description

  The present invention relates to an electronic keyboard instrument using an electrostatic speaker.

  Conventionally, in an electronic keyboard instrument, a cone speaker is generally provided as a sounding means. Cone speakers are arranged at various locations depending on the model, such as the rear, bottom, and top of the instrument body. Among them, when it is desired to emit sound toward the audience on the back side of the instrument body, it is relatively suitable to provide the cone speaker toward the rear part of the instrument body. However, the two left and right cone speakers that are normally provided are not sufficient for wide and even sound emission at the rear. Moreover, since the sound emission direction is on the opposite side for the player, it is not easy to monitor the musical tone satisfactorily as it is.

  Therefore, there is a musical instrument in which a cone speaker dedicated to the monitor is provided on the player side (front side). However, a dedicated monitor cone speaker must be provided separately from the rear sound emission. In addition, the musical sound emitted from the cone speaker dedicated to the monitor is indeed the musical sound of an electronic musical instrument, and is different from the sound of a natural musical instrument in which the entire musical instrument is sounding.

  Incidentally, a surface speaker using an electrostatic speaker is known as a sound generation means (Patent Documents 1 and 2 below). It is conceivable to use such a surface speaker as a sounding means for an electronic keyboard instrument.

JP 2008-028652 A JP 2008-227832 A

  However, since an electrostatic speaker is not high in sound transmission efficiency compared to a cone speaker, it is necessary to ensure a large area for emitting sound. In particular, when the above conventional surface speaker is also used for monitoring, if it is disposed at the front side of the instrument body similar to the conventional monitor dedicated speaker, a large area is ensured. Have difficulty.

  The present invention has been made in order to solve the above-described problems of the prior art, and an object of the present invention is to provide an electronic keyboard instrument capable of emitting sound widely and equally to the rear and efficiently transmitting the sound to the player. It is to provide.

  In order to achieve the above object, an electronic keyboard musical instrument according to claim 1 of the present invention includes a musical instrument main body (10), a keyboard portion (KB) disposed in a front portion (10a) of the musical instrument main body, and an electrostatic type. The speaker is configured in a plate shape and is disposed in the rear part (10b) of the instrument body, and has a surface speaker (30) that generates a musical sound in accordance with a performance operation of the keyboard unit. It is characterized by being curved so as to protrude rearward in a plan view.

  Preferably, the musical instrument main body has a first sound emitting portion (15) provided above the rear portion (KBa) of the keyboard portion and allowing the sound emitted from the surface speaker to pass to the player side (Claim 2). . Preferably, it has a keyboard cover (20) that slides back and forth and transitions between a closed state that covers the keyboard part and an open state that allows the keyboard part to be opened to enable performance, and the keyboard cover is opened. Then, a sound emission path (R1) from the area lower than the rear end portion (22a) of the keyboard lid of the surface speaker to the first sound emission portion through the upper portion of the keyboard lid is formed. (Claim 3).

  Preferably, the musical instrument main body includes a speaker box (25) disposed on the shelf board (11) and having a rear upper surface that is a lower slope (27) toward the rear, and the rear end of the speaker box. The part (27a) is located below the center position (P) of the surface speaker, and a sound emission path (R3, R4) from the surface speaker to the first sound emission part through the upper surface of the slope is provided. (Claim 4).

  Preferably, the surface speaker is disposed so as to be inclined rearward so as to face the first sound emitting unit in a side view.

  Preferably, it has a second sound emitting part (17) provided in the mouth bar part (14) of the musical instrument main body for guiding the sound emitted from the surface speaker to the player side (Claim 6). Preferably, it has a keyboard cover (20) that slides back and forth and transitions between a closed state that covers the keyboard part and an open state that allows the keyboard part to be opened to enable performance, and the keyboard cover is opened. In this case, a sound emission path (R2) is formed from an area lower than the rear end portion (22a) of the keyboard lid of the surface speaker to the second sound emission portion through the lower portion of the keyboard lid. (Claim 7).

  In addition, the code | symbol in the said parenthesis is an illustration.

  According to claim 1 of the present invention, sound can be emitted widely and evenly to the rear, and the sound can be efficiently transmitted to the player.

  According to claim 2, the sound can be efficiently delivered to the player. According to the third aspect, the sound can be efficiently transmitted to the player side in the opened state.

  According to the fourth aspect of the present invention, it is possible to efficiently transmit the sound to the player side in the configuration with the built-in speaker box.

  According to claim 5, the sound emission efficiency to the player side through the first sound emission unit is further enhanced.

  According to the sixth aspect, the sound can be efficiently delivered to the player. According to the seventh aspect, the sound can be efficiently transmitted to the player side in the opened state.

It is the perspective view of the electronic keyboard musical instrument which concerns on the 1st Embodiment of this invention, and the top view of the rear part. 1 is a schematic side view of a musical instrument main body, a perspective view showing the inside of a right rear part, and a perspective view showing a part of a right part of a surface speaker unit in cross section. It is a perspective view of the electronic keyboard musical instrument which concerns on the 2nd Embodiment of this invention, and a typical side view of a musical instrument main body. It is a schematic diagram which shows the modification of arrangement | positioning of a surface speaker unit.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1A is a perspective view of an electronic keyboard instrument according to the first embodiment of the present invention. FIG. 1B is a plan view of the rear part of the electronic keyboard instrument. FIG. 2A is a schematic side view of the musical instrument main body 10.

  As shown in FIG. 1A, the electronic keyboard instrument includes a musical instrument main body 10 supported by legs 28. A keyboard portion KB is disposed on the front portion 10 a of the musical instrument body 10. Inside the musical instrument main body 10 surrounded by the top plate 12, the back plate 13 and the left and right side plates 39, a surface speaker unit 30 is disposed on the rear portion 10b of the musical instrument main body 10.

  Above the rear part KBa of the keyboard part KB, the instrument body 10 is provided with a first opening 15 (FIGS. 1A and 2A). A saran net 16 having a large number of through holes is attached to the first opening 15. Further, the mouth bar portion 14 of the front portion 10a of the instrument body 10 is provided with a second opening portion 17 having a large number of small holes. A saran net may also be attached to the second opening 17.

  A keyboard lid 20 is disposed on the instrument body 10. The keyboard lid 20 includes a front lid 21 and a rear lid 22 that are pivotally connected by a pivot shaft 23. The keyboard lid 20 is slidable in the front-rear direction along a guide groove (not shown) formed on the inner side of the side plate 39. The keyboard cover 20 covers the keyboard part KB from above in the closed state, and in the open state shown in FIGS. 1 (a) and 2 (a), the keyboard part KB is opened to enable performance.

  An electronic circuit unit (not shown) is disposed on the shelf board 11 below the front lid 21 in the open state. In addition to the electronic circuit unit, a cone speaker may be disposed on the shelf 11 below the front lid 21. When the cone speaker is provided, the shelf plate 11 is provided with an opening for sound emission. With this electronic circuit unit, an electronic musical sound corresponding to the performance operation of the keyboard part KB is generated from the surface speaker unit 30 (and the existing cone speaker).

  FIG. 2B is a perspective view showing the inside of the right rear part of the musical instrument main body 10, and FIG. 2C is a perspective view showing a part of the right part of the surface speaker unit 30 in cross section.

  As shown in FIG. 1B, the surface speaker unit 30 is curved so as to protrude rearward in plan view. The basic configuration of the surface speaker unit 30 is the same as a known one as disclosed in, for example, Japanese Patent Laid-Open No. 2008-227832, and the power feeding method is the same as the conventional one.

  As shown in FIG. 2C, the surface speaker unit 30 includes a surface speaker unit 32 supported by a substantially rectangular frame 31 that is long in the left-right direction. Although not shown in detail, the surface speaker unit 32 is an electrostatic speaker and is configured in a plate shape with a diaphragm, an insulating material, and a fixed electrode as main parts. In FIG. 2C, the thickness of the surface speaker portion 32 is exaggerated and drawn so as to be as thin as about 1 mm even if the electrodes are included. When a predetermined voltage is applied to the fixed electrode and a bias voltage is applied on the diaphragm, sound is generated by the vibration of the diaphragm by electrostatic force.

  Incidentally, as shown in FIG. 1, if the surface speaker unit 32 can be extended widely over the entire rear surface of the musical instrument body 10, a volume equivalent to that of a monitor speaker can be generated with only an audio output signal without applying a bias voltage. It is also possible.

  The frame 31 may be formed in a free state so as to have an arc shape as shown in FIG. 1B, but is formed straight so as to have flexibility enough to bend into the arc shape. May be. For example, the frame 31 is manufactured by outsert molding a resin on a metal plate. As shown in FIG. 2C, the surface speaker unit 32 is fitted into the groove on the inner side of the frame body 31, and the surface speaker unit 32 is fastened to the frame body 31 via the plurality of fastening holes 33, thereby The speaker unit 30 is manufactured.

  Taking the case where the back plate 13 is made of resin as an example, as shown in FIG. 2B, the back plate 13 has a large number of small holes 13a for sound emission. Vertical bosses 19 are formed on the left and right ends of the back plate 13. The shelf plate 11 and the back plate 13 are fixed by screwing screws 29 from below into the boss 19 through the fastening holes of the shelf plate 11.

  A plurality of vertical ribs 18 are formed on the front surface of the back plate 13. The protrusion height of the vertical rib 18 toward the front is higher at the left and right end portions, and is the lowest at the center portion in the left and right direction. Accordingly, the line connecting the front end positions of the vertical ribs 18 has an arc shape in plan view.

  Then, the frame body 31 of the surface speaker unit 30 is brought into contact with the front end of the vertical rib 18 and is screwed between two adjacent predetermined vertical ribs 18. At the same time, the back surface of the surface speaker portion 32 at the middle position in the left-right direction is bonded to the front end of the vertical rib 18 with a double-sided tape or the like via a cushioning material such as felt. Thereby, as shown in FIG.1 (b), the surface speaker unit 30 can be curved and arrange | positioned in circular arc shape. The arrangement method of the surface speaker unit 30 is an example, and it does not matter.

  Sound is emitted from the surface speaker unit 30 in both the front and rear directions. Regarding the sound emission to the rear, the sound is emitted through a small hole 13a (FIG. 2B) of the back plate 13. Since the surface speaker unit 30 is convex rearward, the sound is widely diffused in the left-right direction, and is emitted widely and evenly toward the audience on the rear side of the instrument body 10.

  Regarding the sound emission from the surface speaker unit 30 to the player side (front), the first opening 15 and the second opening 17 are the main sound emission parts for emitting sound to the player side. . However, sound is also emitted through the gaps between the keys in the keyboard part KB and through gaps at various points such as between the keyboard lid 20 and the instrument body 10. Since the surface speaker unit 30 is convex rearward, a so-called acoustic lens effect acts, and the sound transmission effect to the player side is amplified as compared with the case of the planar arrangement.

  Here, as shown in FIG. 2A, the keyboard cover 20 is normally in an open state during performance. At this time, the rear end portion 22a of the rear cover 22 which is also the rear end portion of the keyboard cover 20 is lower than that in the closed state. In this example, the rear end portion 22a is particularly the vertical speaker unit 30 in the vertical direction. It is located below the center position P of. Therefore, the sound emitted mainly from the area above the rear end portion 22a of the surface speaker unit 30 passes through the first opening 15 through the sound emission path R1 above the keyboard lid 20, and the player side Sound is emitted. On the other hand, the sound emitted mainly from the area below the rear end portion 22a of the surface speaker unit 30 passes through the second opening 17 through the sound emission path R2 below the keyboard cover 20, and the player side. Sound is emitted.

  In this example, the area below the rear end portion 22a is small, but depending on the position of the rear end portion 22a, the sound emission path is largely divided into two upper and lower parts. In this way, the sound from the surface speaker unit 30 is transmitted to the player side through the first opening 15, the second opening 17, and the gaps at various places. As a result, it is recognized that the entire instrument body 10 is sounding. Therefore, it becomes closer to a natural musical instrument than the sound when a cone speaker for monitoring is provided toward the front side of the musical instrument main body 10.

  Since the surface speaker unit 30 is disposed on the back plate 13 in the rear portion 10b of the musical instrument main body 10, it is advantageous for securing a large area. Moreover, it is advantageous also for sound emission widely backward. In spite of this, since the device is devised to emit sound through the inside of the instrument body 10 to the player side, it is useful for the player to monitor the sound. In particular, the surface speaker unit 30 has a circular arc shape in plan view, and the left and right end portions face inward, so that a sound collecting action is generated at the player's position, and sound is efficiently delivered to the player.

  Therefore, according to the present embodiment, sound can be emitted widely and evenly and the sound can be efficiently transmitted to the player. In particular, by providing the first opening 15 and the second opening 17, the sound can be delivered to the player more efficiently.

  In addition, since the sound emission path R1 is formed above the keyboard lid 20, a configuration in which the surface speaker unit 30 is provided only in the upper half region of the musical instrument main body 10 and a second opening 17 are provided. Even if it is a structure which is not, a sound can be efficiently transmitted to the player side in an open state. Furthermore, since the sound emission path R2 is formed below the keyboard lid 20, even if the rear end position of the keyboard lid 20 in the opened state is temporarily high or the first opening 15 is not provided. In the open state, the sound can be efficiently transmitted to the player side.

(Second Embodiment)
FIG. 3A is a perspective view of an electronic keyboard instrument according to the second embodiment of the present invention. FIG. 3B is a schematic side view of the musical instrument main body 10.

  In the second embodiment, the keyboard cover 20 is abolished compared to the first embodiment, the shape of the back plate 13 is changed, and the speaker box 25 is devised for the formation of a sound emission path. The provided points are different. Other configurations are the same as those of the first embodiment.

  As shown in FIGS. 3 (a) and 3 (b), a pair of left and right speaker boxes 25 are disposed on the shelf board 11 behind the keyboard unit KB inside the instrument body 10. The speaker box 25 has a cone speaker (not shown), and is configured to emit sound from a sound emitting unit 11a formed by opening the shelf plate downward. The left and right speaker boxes 25 are formed in a symmetrical shape. The upper surface 26 of the front half of the speaker box 25 is horizontal, but the upper surface (or rear surface) of the rear half is a slope 27. The slope 27 is lower toward the rear. The rear end portion 27 a of the slope 27 that is also the rear end portion of the speaker box 25 is substantially the same height as the upper surface of the shelf board 11.

  Further, the curved shape of the surface speaker unit 30 is the same as that of the first embodiment. However, the back plate 13 is curved in advance. And the some vertical rib 18 (refer FIG.2 (b)) of the front surface of the backplate 13 has the protrusion height ahead. Therefore, the surface speaker unit 30 is disposed along a curve provided in advance on the back plate 13. In this way, in consideration of the external design of the grand piano, the surface speaker unit 30 can be attached along the rear curved surface of the musical instrument main body 10 without waste in terms of space, and design restrictions are small.

  In such a configuration, sound emission from the surface speaker unit 30 to the rear is the same as in the first embodiment, and sound is emitted through the small hole 13 a of the back plate 13. On the other hand, regarding the sound emission to the player side (front), as shown in FIG. 3B, the sound from the area higher than the upper surface 26 of the speaker box 25 in the surface speaker unit 30 is mainly from the speaker box 25. The sound is emitted to the player side through the first opening 15 through the sound emission path R3 at a position higher than the upper surface 26. In addition, sound from the area lower than the upper surface 26 of the speaker box 25 in the surface speaker unit 30 mainly passes along the inclined surface 27 and the upper surface 26 of the speaker box 25 and passes through the sound emission path R4 to the first opening. The sound is emitted to the player side through the section 15. The slope 27 also has the effect of reflecting sound and directing it forward.

  An electronic circuit unit (not shown) is also disposed between the two speaker boxes 25 and has a rear slope similar to the slope 27 of the speaker box 25. Therefore, sound is emitted along the same route as the sound emission routes R3 and R4 even in the region where the electronic circuit unit is located. Of course, since there is a gap in the instrument body 10 where the speaker box 25 and the electronic circuit unit are not interposed, some sounds are transmitted to the player side through the second opening 17, the gap, and the gaps at various places. The

  According to the present embodiment, it is possible to produce the same effects as those of the first embodiment with respect to sound that is widely and evenly emitted rearward and efficiently transmitted to the player. Particularly, since the upper surface of the rear portion of the speaker box 25 is the inclined surface 27, it is possible to efficiently transmit the sound to the player side in the configuration in which the speaker box 25 is incorporated.

  The rear end portion 27a of the slope 27 is preferably low, but it is lower than the highest position of the speaker box 25 and lower than the central position P of the surface speaker unit 30, so that the first opening portion 15 The minimum sound emission efficiency is ensured.

  By the way, in each said embodiment, although the surface speaker unit 30 was straight in the perpendicular direction, you may provide an inclination in the front-back direction so that a modification may be shown in FIG. For example, the surface speaker unit 30 is disposed so as to be inclined rearward so as to face the first opening 15 in a side view. Specifically, the planar speaker unit 30 is perpendicular to a straight line L connecting the central position P of the planar speaker unit 30 and the central position P2 of the first opening 15 in the up-down direction in a side view. Tilt. Thereby, the sound emission efficiency to the player side through the first opening 15 is further enhanced.

  Note that a part of the above embodiment may be combined. For example, a configuration in which the keyboard lid 20 is provided and the back plate 13 is curved in advance may be employed. Or while having the surface speaker unit 30, you may employ | adopt the structure where the backplate 13 is straight in the left-right direction.

  DESCRIPTION OF SYMBOLS 10 Musical instrument main body, 11 Shelf board, 14 Mouth stick part, 15 1st opening part (1st sound emission part), 17 2nd opening part (2nd sound emission part), 20 Keyboard cover, 22a Rear end Part, 27 slope, 27a rear end part, 25 speaker box, 30-side speaker unit (plane speaker), R1-R4 sound emission path, KB keyboard part, KBa rear part, P center position

Claims (7)

The instrument body,
A keyboard portion disposed in front of the instrument body;
A surface speaker that is configured in a plate shape with an electrostatic speaker and is arranged at the rear part of the instrument body, and that generates a musical sound in response to a performance operation of the keyboard part;
The electronic keyboard instrument, wherein the surface speaker is curved so as to protrude backward in plan view.   2. The electronic keyboard instrument according to claim 1, further comprising a first sound emitting unit that is provided above the rear part of the keyboard part of the instrument body and allows a sound emitted from the surface speaker to pass to the player side.   When sliding the keyboard back and forth, the keyboard has a keyboard cover that transitions between a closed state that covers the keyboard part and an open state that allows the keyboard part to be opened so that the keyboard can be played. 3. The electronic keyboard according to claim 2, wherein a sound emission path from an area lower than a rear end portion of the keyboard lid of the speaker to the first sound emission portion through the upper portion of the keyboard lid is formed. Musical instrument.   The speaker body has a speaker box disposed on a shelf in the instrument main body, and the rear upper surface is a lower slope toward the rear, and the rear end of the speaker box is below the center position of the surface speaker. 3. The electronic keyboard instrument according to claim 2, wherein a sound emission path is formed from the surface speaker to above the slope to the first sound emission unit.   5. The electronic device according to claim 2, wherein the surface speaker is disposed to be inclined rearward so as to face the first sound emitting unit in a side view. Keyboard instrument.   6. The apparatus according to claim 1, further comprising a second sound emitting unit that is provided in a mouth bar portion of the musical instrument main body and guides a sound emitted from the surface speaker to a player side. Electronic keyboard instrument.   When sliding the keyboard back and forth, the keyboard has a keyboard cover that transitions between a closed state that covers the keyboard part and an open state that allows the keyboard part to be opened so that the keyboard can be played. 7. The electronic circuit according to claim 6, wherein a sound emission path is formed from an area of the speaker lower than a rear end portion of the keyboard cover to a position below the keyboard cover to the second sound emission section. Keyboard instrument.

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