JP2541017B2 - Electronic musical instrument speaker box - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention relates to a speaker box that is incorporated in the electronic musical instrument main body of the keyboard electronic musical instrument.

[0002]

2. Description of the Related Art A conventional electronic musical instrument body (hereinafter referred to as "instrument body")
There is a speaker box shown in FIGS. 20 and 21, for example.

FIG. 20 shows a speaker box 33 fixed to an upper case 31 having a panel surface on which a large number of operators, electric parts, mechanical parts, etc. are arranged, by screwing or the like, and FIG. The speaker box 34 is fixed to the lower case 32 that covers the lower part of the device by screwing or the like.

[0004]

However, in the speaker box of such a conventional electronic musical instrument, as shown in FIG.
As shown in FIG. 0, the speaker box fixed to the upper case is the substrate 35 mounted parallel to the panel surface.
Since the space below cannot be used, the volume of the speaker box cannot be increased.

Further, in the structure shown in FIG. 21, the space below the substrate 35 can be utilized, and the volume of the speaker box can be increased to extend the low frequency range and improve the sound quality. There is a problem that if the above is not firmly fixed, sticking occurs, and even if it is firmly fixed, if the rigidity of the bottom surface of the lower case is not high, it resonates and causes a casing noise. To avoid this, increase the rigidity of the lower case and firmly fix the speaker box,
Not only is the production cost soaring, but the weight of the instrument itself is increased, which hinders portability.

Further, in the electronic musical instrument, due to the arrangement of the operators and various parts on the panel, if the volume of the speaker box is increased as a regular box like a general speaker system, the operation on the panel is not possible. There are also problems that it is not possible to arrange children, electrical parts, and mechanical parts, and the size of the instrument body becomes large.

The present invention has been made in view of the above points, and an object of the present invention is to provide a speaker box for an electronic musical instrument having a good low frequency range and good frequency characteristics.

[0008]

In order to achieve the above object, the present invention is a speaker box built into an electronic musical instrument body having a keyboard portion, the space inside the electronic musical instrument body including the lower portion of the keyboard portion. The present invention provides a speaker box for an electronic musical instrument, which is extended to the above and has a duct provided at a position other than the lower part of the keyboard.

[0009]

[0010]

Since the speaker box of the electronic musical instrument according to the present invention is arranged so as to extend into the space inside the musical instrument body including the keyboard portion, a large volume speaker box can be stored in a small space. Therefore, the lower Elsewhere in the keyboard section of the port <br/> over preparative opening having a duct, for example be provided near a speaker or the like, can be obtained a flat frequency response which does not generate a peak in the low frequency range, the duct The degree of freedom in design, such as the length, is also improved.

[0011]

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to FIGS.

FIG. 14 is a plan view of a portable keyboard electronic musical instrument embodying the present invention. In this keyboard electronic musical instrument, a keyboard portion 2 is provided in the front half of the musical instrument body 1, and a panel surface 3 is provided in the latter half of the instrument body, on which various operating elements and a display are provided. Speaker panels 4 and 5 are provided.
The first speaker box 10 is located at a position indicated by an imaginary line in the figure on the lower portion of the keyboard portion 2 and the panel surface 3 of the instrument body 1 on the left end side.
And the second speaker box 20 is built in the lower portion on the right end side of the panel surface 3, and as is apparent from the figure, the first speaker box 10 is the second speaker box 2
The volume is set larger than 0, and the respective speakers face the first and second speaker panels 4 and 5.

The first speaker box 10 shows an embodiment of the present invention, and as shown in FIG.
The housing 11 is integrally formed of a synthetic resin material, and has a surface 11a facing the first speaker panel 4 and slightly inclined toward the front as shown in FIGS. 2 to 5. The speaker mounting opening 11b is formed to attach the main speaker 13, the port opening 11c having a duct is formed adjacent to the main speaker 13, and the tweeter 14 is attached adjacent to the port opening 11c.

The instrument main body 1 is adjacent to the surface 11a of the housing 11.
Below the panel surface 3 of the instrument, the stepped surface 1 extending in the space inside the instrument body 1 avoiding various electric parts and mechanical parts.
1d is formed, and a rib 11e for reinforcement and resonance prevention is formed on the back surface.
To provide. Further, below the keyboard portion 2, a further lowered surface 11f is formed to avoid the keyboard mechanism to increase the inner volume of the housing 11 as much as possible, and to strengthen the surface of the housing 11 and prevent resonance. The double-sided concavo-convex shape is formed. further,
The housing 11 is provided with a pair of insertion openings 11g, 11g so that legs protruding from the keyboard frame for fixing a keyboard frame and a bottom plate (not shown) can be inserted, and screw holes 11h are provided at a plurality of positions of the housing 11. The back plate 12 provided and fitted from below is firmly screwed to the housing 11.

As shown in FIG. 6, the back plate 12 has a flat plate shape, and a sound absorbing material such as glass wool is attached to the inner surface thereof. Then, the first speaker box 10 configured as described above is fixed to the left end portion of the musical instrument body 1 shown in FIG.

On the other hand, the second speaker box 20 comprises a housing 21 and a back plate 22 as shown in FIGS.
The housing 21 is integrally molded with a synthetic resin material, and
As shown in FIGS. 9 to 11, a surface 21a slightly inclined forward is provided facing the second speaker panel 5 of the musical instrument body 1 shown in FIG. 9, and a speaker mounting opening 21b is formed on the surface 21a. Then, the main speaker 23 is attached, and the tweeter 24 is provided adjacent to the main speaker 23 by a pair of bosses 21c and 21c.
Attach. Further, a stepped surface 2 extending in a space inside the musical instrument body 1 at a lower portion of the panel surface 3 adjacent to the surface 21a while avoiding various electric parts and mechanical components inside the musical instrument body 1.
Form 1d.

In addition, the escape 21e of the power switch (not shown) in the housing 21, the escape 21f of the leg of the frame reinforcing member,
Escape of the legs of the metal fittings for the floppy scribing device 21
g and 21g are formed to form a concavo-convex shape for reinforcing strength and preventing resonance. Further, screw holes 21h are provided at a plurality of positions of the housing 21 to fit the back plate 22 from below and firmly screw it.

As shown in FIGS. 8 and 13, the rear plate 22 is integrally formed with a port opening 25 having a duct upward, and its position on the plane is set as shown by phantom lines in FIG. To do. Then, the second speaker box 20 configured as described above is fixed to the right end portion of the musical instrument body 1 shown in FIG.

This embodiment is configured as described above.
The volume of the first speaker box 10 is much larger than that of the second speaker box 20. If the speaker box has such a large volume, it has a duct.
Even if the port opening 11c is attached in the vicinity of the main speaker 13, there is no possibility that a peak will occur in the bass range, and the bass characteristic improves as the volume increases.

15 and 16 are diagrams showing comparative examples of frequency characteristics of speaker boxes having different volumes,
15 shows a speaker box in which the lower part of the keyboard having the surface 11 f in FIG. 1 is removed, and FIG. 16 shows frequency characteristics of the speaker box shown in FIG.
It can be seen that the bass range of 6 is extended.

Further, since the surface of the casing 11 has an uneven shape while avoiding the respective components, it does not resonate at a specific frequency and generate a high peak unlike a speaker box having a flat wall surface. , The peaks are dispersed in a plurality of parts and show a flat characteristic as a whole.

Also, because of the unevenness formed on the surface of the housing, the rigidity is higher than that of a flat speaker box, and resonance is effectively prevented even if the thickness is reduced, and the speaker box can be made lighter. become.

Furthermore, since the speaker box is a one-box type consisting of a housing and a back plate, which are integrally molded, the structure is simpler and the connecting portion is one place than the conventional two-box type. It is possible to easily prevent the chattering generated from the joint portion.

On the other hand, the volume of the second speaker box 20 is smaller than that of the first speaker box 10 described above. The speaker box with such a small volume has a bass reflex shape to extend the low frequency range.
When a port opening having a duct is provided close to the speaker, the lowest resonance frequency (200H
It is known that a peak occurs near z).

Therefore, this second speaker box 2
0, the back plate 22 on the side opposite to the speaker mounting surface 21a
A port opening 25 having a duct is provided so that the port opening 25 is separated from the main speaker 23.

FIG. 17 is a diagram showing the frequency characteristic thereof. As shown in FIG. 19, a port opening having a duct is provided adjacent to the speaker as shown in FIG. You can see that the peak is flat.

The second speaker box 20 is also the first
Since it is a one-box type that has an integrally molded housing 21 like the speaker box 10 of FIG. 1, the structure is simple and sticking is easily prevented, and a housing for mounting the speaker box and a port opening having a duct are formed. Since the back plate is formed, the shape of the molding die is simplified and the die machining becomes easy.

Furthermore, since the surface of the casing 21 has an uneven shape that matches the shape of the space avoiding various parts, it does not resonate at a specific frequency and generate a high peak.
The peaks are dispersed in a plurality of parts to show a flat characteristic, and the rigidity is increased so that the wall thickness can be reduced without impairing the strength, and the weight can be reduced.

In the above embodiment, the first and second
And a concavo-convex case integrally molded with the speaker box of
And to constitute a two-member and the rear plate but, Ru possible der be integrally molded them in one piece.

[0031]

[0032]

As described above, since the speaker box of the electronic musical instrument according to the present invention is extended in the space inside the musical instrument body including the lower part of the keyboard, a large volume speaker box can be accommodated in a small space. can do. Therefore, da
Even if the keyboard is installed in a place other than the lower part of the keyboard, for example, near the speaker, it is possible to obtain good frequency characteristics with no peaks in the low frequency range, and the degree of freedom in design such as the length of the duct is also improved. .

[0033]

[Brief description of drawings]

FIG. 1 is a perspective view of a first speaker box according to the invention of claim 1. FIG.

FIG. 2 is a plan view of a first speaker box housing.

FIG. 3 is a front view of a first speaker box housing.

FIG. 4 is a side view of a first speaker box housing.

5 is a cross-sectional view taken along the line AA of FIG.

FIG. 6 is a plan view of a back plate of a first speaker box.

FIG. 7 is a perspective view of a second speaker box viewed from above.

FIG. 8 is a perspective view of a second speaker box as viewed from below.

FIG. 9 is a plan view of a second speaker box housing.

FIG. 10 is a front view of a second speaker box housing.

FIG. 11 is a side view of a second speaker box housing.

FIG. 12 is a plan view of a back plate of a second speaker box.

FIG. 13 is a partial cross-sectional view showing a port of a second speaker box.

FIG. 14 is a plan view of an electronic musical instrument body embodying the present invention.

FIG. 15 is a diagram showing a frequency characteristic when the lower part of the keyboard of the first speaker box is deleted.

FIG. 16 is a diagram showing frequency characteristics of a first speaker box.

FIG. 17 is a diagram showing frequency characteristics of a second speaker box.

FIG. 18 is a diagram showing frequency characteristics when the port opening of the second speaker box is provided on the speaker mounting surface.

FIG. 19 is a perspective view showing a state where the port opening of the second speaker box is provided on the speaker mounting surface.

FIG. 20 is a cross-sectional view showing a mounted state of a speaker box of a conventional electronic musical instrument.

FIG. 21 is a cross-sectional view showing a mounted state of another speaker box of the conventional electronic musical instrument.

[Explanation of Codes] 1 ... Electronic musical instrument body, 2 ... Keyboard part, 3 ... Panel surface, 4 ... First speaker panel, 5 ... Second speaker panel, 10
... 1st speaker box, 11 ... 1st speaker box housing, 11a ... 1st speaker box speaker mounting surface, 11c ... 1st speaker box port opening, 12 ... 1st speaker box back Face plate, 13 ... Main speaker of first speaker box, 14 ... Tweeter of first speaker box, 20 ... Second speaker box, 21 ... Second speaker box housing, 21a
... the speaker mounting surface of the second speaker box, 22 ... the back plate of the second speaker box, 23 ... the main speaker of the second speaker box, 24 ... the tweeter of the second speaker box, 25 ... the second speaker box Port opening

Claims (1)

(57) [Claims] 1. A speaker box built in an electronic musical instrument main body having a keyboard portion, the speaker box extending in a space inside the electronic musical instrument main body including a lower portion of the keyboard portion, at a location other than a lower portion of the keyboard portion. A speaker box for an electronic musical instrument, which is provided with a duct .