JP2008185763A - Electronic keyboard instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic keyboard instrument capable of compactly constituting an instrument main body and enhancing the flexibility of layouts of acoustic device and parts or the like to be set in a main body case while securing excellent sound quality of musical sound reproduced with a speaker. <P>SOLUTION: The electronic keyboard instrument is provided with: a main body case 11 having a shelf board 12 where an opening 12a pierced in a vertical direction is formed on a bottom part and constituting the exterior of an instrument main body 2; a speaker 32 for reproducing musical sound; a speaker holder 31 having an opening 33a larger then the opening 12a in an upper wall 33, formed of a box shape with a sound emission hole 34a in a lower wall 34, housing the speaker 32 so that a sound emission surface 32a approaches the sound emission hole 34a, and attached on the lower surface of the shelf board 12 in the state of covering the opening 12a of the shelf board 12; and leading-out parts 30a and 30b for leading sound emitted from a surface excepting the sound emitting surface 32a of the speaker 32 through the opening 12a of the shelf board 12 and the main body case 11 to the outside. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electronic keyboard instrument such as an electronic piano provided with a keyboard and a speaker that reproduces musical sounds when the keyboard is depressed.

  As a conventional electronic keyboard instrument, for example, an electronic piano disclosed in Patent Document 1 is known. This electronic piano includes a main body case that constitutes the outer shell of the piano main body, and a shelf board on which a keyboard is placed is provided at the bottom. A bottom plate extending in the left-right direction and having substantially the same length as the shelf plate is provided below the shelf plate, and two left and right bass speakers are provided between the bottom plate and the shelf plate. Each of the shelf plate and the bottom plate is formed with openings that penetrate in the vertical direction and are opposed to each other at predetermined positions on the left and right. Each low-frequency speaker has a bottom plate with its front surface, i.e., a sound emitting surface that mainly emits sound, covering the bottom plate opening from above, and its rear end protruding on the shelf plate through the shelf plate opening. Mounted on top. On the shelf board, two left and right box-like speaker covers are attached so as to cover the left and right openings and the rear end portion of the bass speaker protruding from each opening. Furthermore, a partition plate for partitioning a space defined by the shelf plate and the bottom plate to the left and right is attached to a central portion in the left-right direction between the shelf plate and the bottom plate. As described above, in this electronic piano, the bottom plate functions as a baffle plate for a bass speaker, and a speaker box (enclosure) that houses each bass speaker is configured by the bottom plate, a shelf plate, a speaker cover, a partition plate, and the like. Has been.

  In addition to the two bass speakers described above, the electronic piano is provided with two treble speakers. These high-pitched speakers are arranged at predetermined positions on the left and right sides of the main body case so that the respective sound emitting surfaces face the front player side.

  In the electronic piano configured as described above, when a key is pressed, a musical sound is reproduced by a low-frequency speaker and / or a high-frequency speaker according to the sound range. As described above, in the conventional electronic piano, it is possible to reproduce a musical sound having a good sound quality by providing dedicated speakers for the low and high sound ranges. However, in the main body case of the piano body, a speaker cover for configuring a speaker box is installed for each low-frequency speaker, so the space in the main body case is reduced by the volume of the speaker cover, Therefore, the layout of components such as an acoustic device such as an amplifier and a circuit board to be installed in the main body case is restricted. In addition, since the speaker cover is disposed behind the keyboard on the shelf board, for example, in an electronic piano having a wooden keyboard whose length in the front-rear direction is longer than that of a plastic keyboard, the depth dimension of the main body case As a result, there is a problem that the piano body becomes large.

  The present invention has been made in order to solve the above-described problems. The layout of acoustic devices and components to be installed in the main body case is ensured while ensuring good sound quality of the music reproduced by the speaker. An object of the present invention is to provide an electronic keyboard instrument that can increase the degree of freedom and that can be configured compactly.

JP 11-219180 A

  In order to achieve the above-mentioned object, the invention according to claim 1 has a shelf having an opening penetrating in the vertical direction at the bottom, and a main body case that constitutes the outer shell of the instrument main body, and reproduces a musical sound. And a speaker having an opening larger than the opening on the upper wall and having a sound emitting hole on the lower wall, and housing the speaker so that the sound emitting surface of the speaker faces the sound emitting hole. The speaker holder attached to the lower surface of the board covering the opening of the shelf, and the sound emitted from the surface other than the sound emitting surface of the speaker provided in the main body case And a lead-out portion for leading the outside to the outside.

  According to this configuration, the shelf board in which the opening penetrating in the vertical direction is provided at the bottom of the main body case constituting the outer shell of the instrument body, and the box-like shape for accommodating the speaker is provided on the lower surface of the shelf board. A speaker holder is attached. This speaker holder has an opening larger than the opening of the shelf on the upper wall and a sound emitting hole on the lower wall, and houses the speaker so that the sound emitting surface of the speaker faces the sound emitting hole, It is attached to the shelf board in a state of covering the opening of the shelf board. Thereby, while the shelf board with which the speaker holder was attached functions as a baffle board, a main body case functions as a speaker box. And among the musical sounds reproduced by the speaker, the sound emitted from the sound emitting surface is emitted to the outside through the sound emitting hole of the speaker holder, while the sound emitted from the surfaces other than the sound emitting surface is emitted. The sound passes through the opening of the shelf and the inside of the main body case, is guided to the outside through the lead-out portion, and is emitted.

  As described above, the shelf board to which the speaker holder is attached is used as a baffle board, and the main body case is used as a speaker box. It is possible to ensure good sound quality of the reproduced musical sound. In addition, since the speaker cover can be omitted, the space in the main body case is widened, so that the degree of freedom of the layout of the acoustic devices and parts to be installed in the main body case can be increased. Furthermore, since the speaker cover can be omitted, the instrument body can be configured compactly without increasing the depth dimension of the main body case even when a wooden keyboard having a relatively long key length in the front-rear direction is employed. .

  According to a second aspect of the present invention, in the electronic keyboard instrument according to the first aspect, the speaker is a speaker for reproduction of the entire range.

  According to this configuration, since a speaker for full-range reproduction, so-called full-range speaker, is adopted as the speaker, even if the conventional high-frequency speaker installed in the main body case of the musical instrument body is omitted, reproduction is performed with the speaker. It is possible to ensure good sound quality of the musical sound that is played. Further, the space in the main body case can be widened by omitting the above high-frequency speaker, and thereby the degree of freedom in layout of the acoustic devices and parts in the main body case can be further increased.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an electronic piano according to an embodiment of the present invention. As shown in the figure, the electronic piano 1 includes a piano main body 2 (instrument main body) and a stand 3 that supports the piano main body 2 from below. The stand 3 includes a pair of left and right leg portions 4 and 4 that extend in the vertical direction and are arranged at a predetermined interval in the left and right direction. Are connected by a pedal base 5 having Further, a back plate 6 is attached to the back side of the stand 3 by being screwed to both the leg portions 4 and 4 and the pedal base 5.

  As shown in FIGS. 1 and 2, the piano main body 2 has a main body case 11 constituting an outer shell thereof. The main body case 11 has a horizontally long rectangular horizontal shelf board 12 at the bottom thereof, and this shelf board 12, a pair of left and right side boards 13, 13, a back board 14, a top board 15, a front board 16, and the like. Thus, it is formed in a box shape. In the main body case 11, an acoustic device such as an amplifier and components (not shown) such as a circuit board are installed.

  A keyboard device 20 is placed on the shelf board 12. The keyboard device 20 is connected to a keyboard 22 composed of a large number of keys 21 arranged in the left-right direction, a keyboard chassis 23 fixed to the shelf 12 and supporting the keyboard 22 from below, and a rear end portion of the keyboard chassis 23. The action chassis 24 and a number of hammers 25 (only one of which is shown) that are rotatably supported by the action chassis 24 and that rotate as the keys 21 are pressed are provided. The key 21 is made of a wood material and is configured in substantially the same manner as an acoustic piano key.

  As shown in FIG. 2, a large number of balance pins 26 (only one is shown) are erected in the left-right direction at the center of the keyboard chassis 23 in the front-rear direction (left-right direction in the figure). The balance pin 26 is loosely inserted into a balance pin hole 21 a formed at the center of the corresponding key 21. As a result, the key 21 swings up and down around the balance pin 26 when the key is pressed. The hammer 25 is placed on the rear end of the upper surface of the corresponding key 21 via the capstan 27. When the key is depressed, the hammer 25 is pushed up via the capstan 27 to rotate upward. Move. Thereby, the hammer 25 presses a key switch (not shown), and the key pressing information of the key 21 is output to an electronic circuit (not shown), and based on this, a musical sound is reproduced by the speaker 32 described later.

  An operation panel 28 extending in the left-right direction is provided above the keyboard 22 between the left and right side plates 13. The operation panel 28 is provided with a plurality of operation buttons 28a and operation levers 28b for setting tone color, volume, various sound effects and the like, and a display 28c for displaying the set sound effects and the like. Is provided.

  Further, the piano body 1 is provided with a front / back slide type keyboard cover 29 for covering the keyboard 22. The keyboard lid 29 is formed in a horizontally long shape, and a front guide portion 13a and a rear guide portion 13b provided so that front and rear end portions on both right and left sides extend in the front-rear direction on the inner surface of the corresponding side plate 13, respectively. Is slidably engaged. When the keyboard lid 29 is opened, slight gaps 30 a and 30 b (leading out) are provided between the keyboard lid 29 and the front end portion of the top panel 15 and between the keyboard lid 29 and the upper end portion of the operation panel 28. Part) is formed.

  In addition, circular openings 12a and 12a having a predetermined diameter are formed in the rear portion of the shelf board 12 at predetermined positions on both the left and right sides and penetrating in the vertical direction. Then, on the lower side of the shelf board 12, speakers 32 are provided at positions corresponding to both the openings 12 a and 12 via speaker holders 31, respectively.

  3A and 3B are perspective views of the speaker holder 31, wherein FIG. 3A shows a state when viewed from above, and FIG. 3B shows an inverted state. The speaker holder 31 is made of MDF or the like, has a rectangular planar shape, is relatively low in height, and is formed in a box shape that is largely open upward. An opening 33 a larger than the opening 12 a of the shelf 12 is formed in the upper wall 33 of the speaker holder 31, and the lower wall 34 penetrates in the vertical direction, and is more than a sound emitting surface 32 a described later of the speaker 32. A slightly small circular sound emitting hole 32a is formed. Further, as shown in FIG. 5A, screw holes 34b are formed at the four corners of the lower wall 34 so as to open upward and screw the speaker 32 to the lower wall 34, respectively. Furthermore, attachment holes 35 are formed in the four corners of the speaker holder 31 so as to penetrate in the vertical direction and to screw the speaker holder 31 to the shelf plate 12. As shown in the figure, the lower wall 34 side portion of each mounting hole 35 is formed larger in diameter than the upper wall 33 side portion, and the speaker holder 31 is screwed to the shelf board 12. The screw head is housed so as not to protrude from the lower wall 34.

  The speaker 32 is a full-range speaker that can reproduce musical sounds in almost the entire range of human audible range. As shown in FIG. 2, the speaker 32 faces the sound emitting hole 34 a in a state where the sound emitting surface 32 a is placed on the lower wall 34 of the speaker holder 31, and is opposite to the sound emitting surface 32 a (FIG. 2). The upper half) is accommodated in the speaker holder 31 in a state of protruding upward from the upper wall 33. The speaker 32 is fixed in the speaker holder 31 by screwing a portion around the sound emitting surface 32 a to the lower wall 34.

  As shown in FIG. 2, the speaker holder 31 that houses the speaker 32 as described above is screwed to the shelf board 12 so that the upper wall 33 abuts the lower surface of the shelf board 12 and covers the opening 12a. . Further, in this case, the speaker 32 is in a state in which the portion on the opposite side of the sound emitting surface 32a slightly protrudes on the shelf board 12 through the opening 12a.

  FIG. 4 shows the direction of propagation of the musical sound reproduced by the speaker 32 by arrows. As shown in the figure, among the musical sounds reproduced by the speaker 32, the sound emitted from the sound emitting surface 32 a is emitted downward through the sound emitting hole 34 a of the speaker holder 31. On the other hand, sound emitted from a surface other than the sound emitting surface 32 a of the speaker 32, for example, the back surface of the speaker 32 (including the back surface of the sound emitting surface 32 a), passes through the opening 12 a of the shelf 12 and enters the main body case 11. It is transmitted to. The sound transmitted to the upper side of the keyboard lid 29 in the main body case 11 is guided forward through the gap 30 a between the keyboard lid 29 and the front end of the top plate 15 and emitted. Further, the sound transmitted to the lower side of the keyboard lid 29 is guided forward through the gap 30b between the keyboard lid 29 and the upper end portion of the operation panel 28, and is emitted. In addition to the gaps 30a and 30b, the sound transmitted into the main body case 11 is also guided forward through a gap between the keyboard 22 and the operation panel 28, a gap between the keys 21 and the like. He is sounded.

  As described above, according to the present embodiment, the shelf plate 12 to which the speaker holder 31 is attached is used as a baffle plate, and the main body case 11 is used as a speaker box. Even without installing the speaker cover, it is possible to ensure good sound quality of the musical sound reproduced by the speaker 32. In addition, since the speaker cover can be omitted, the space in the main body case 11 is widened, so that the degree of freedom in the layout of the acoustic devices and parts to be installed in the main body case 11 can be increased. Further, although the key 21 of the keyboard 22 is longer than that of the plastic keyboard, as described above, the speaker cover can be omitted, so that the depth of the main body case 11 is not increased, and the piano main body 2 is made compact. Can be configured.

  In addition, since a full-range speaker is adopted as the speaker 32, it is possible to ensure good sound quality of the musical sound reproduced by the speaker 32 even if a high-frequency speaker conventionally installed in the main body case of the piano body is omitted. Can do. Furthermore, the space in the main body case 11 can be widened by omitting the above high-frequency speaker, and thereby the degree of freedom of layout of the acoustic devices and parts in the main body case 11 can be further increased.

  In addition, this invention can be implemented in various aspects, without being limited to the said embodiment described. For example, in the embodiment, a full-range speaker is adopted as the speaker 32, but instead of this, a low-frequency speaker can be adopted and the high-frequency speaker can be installed inside or outside the main body case 11. In this case, compared with the case where a full-range speaker is employed, although the number of speakers is increased by the number of high-frequency speakers, it is possible to obtain substantially the same effect as the above-described effect of the embodiment. Further, the configuration of details of the outer case 11, the speaker 32, and the speaker holder 31 shown in the embodiment are merely examples, and can be appropriately changed within the scope of the gist of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The electronic piano by one Embodiment of this invention is shown, (a) Front view, (b) The figure which shows the inside of the piano main body along an AA line. It is a figure which expands and shows the piano main body of FIG.1 (b). It is a perspective view which shows a speaker holder, (a) The state seen from upper direction, (b) The state reversed. It is explanatory drawing for demonstrating the direction of propagation of the musical sound reproduced | regenerated by the speaker.

Explanation of symbols

1 Electronic piano (electronic keyboard instrument)
2 Piano body (musical instrument body)
11 Main body case 12 Shelf 12a Opening 21 Key 22 Keyboard 30a Clearance (leading part)
30b Clearance (leading part)
31 Speaker Holder 32 Speaker 32a Sound Release Surface 33 Speaker Holder Upper Wall 33a Opening 34 Speaker Holder Lower Wall 34a Sound Release Hole

Claims (2)

A main body case which has a shelf plate formed with an opening penetrating in the vertical direction at the bottom, and constitutes an outer shell of the instrument main body,
A speaker for playing music,
The shelf has an opening larger than the opening on the upper wall and is formed in a box shape having a sound emitting hole on the lower wall. The speaker is accommodated so that the sound emitting surface of the speaker faces the sound emitting hole, and the shelf A speaker holder attached to the lower surface of the plate in a state of covering the opening of the shelf plate;
A lead-out portion that is provided in the main body case and guides the sound emitted from a surface other than the sound emitting surface of the speaker to the outside through the opening of the shelf and the main body case;
An electronic keyboard instrument characterized by comprising:   The electronic keyboard instrument according to claim 1, wherein the speaker is a speaker for reproduction of a full range.

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