JPH04241395A - Loud speaker box for electronic equipment - Google Patents

Abstract

PURPOSE:To obtain flat frequency characteristics which have improved the low frequency range expanded and are free from resonance and trembling, on the loud speaker box. CONSTITUTION:The speaker box is extended in the space in an electronic musical instrument main body and its housing is constituted in an uneven shape consisting of the fitting surface 11a for a main speaker 13, a surface 11d right below it, a surface 11f further below it, etc., in conformity with the shape of said space while electronic components and mechanism components arranged therein are avoided.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker box built into a main body of an electronic musical instrument such as a keyboard electronic musical instrument.

0002

[Prior Art] Conventional electronic musical instrument bodies (hereinafter referred to as "musical instrument bodies")
For example, there are speaker boxes built into a speaker box such as those shown in FIGS. 20 and 21.

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

0004

[Problem to be Solved by the Invention] However, in the speaker box of such a conventional electronic musical instrument,
In the case where the speaker box is fixed to the upper case as shown in 0, the board 35 is attached parallel to the panel surface.
Since the space below cannot be used, the volume of the speaker box cannot be increased.

Furthermore, in the case shown in FIG. 21, the space below the board 35 can be used, and the volume of the speaker box can be increased to extend the bass range and improve the sound quality. If the lower case is not firmly fixed, stuttering will occur, and even if the lower case is fixed firmly, unless the bottom surface of the lower case has high rigidity, resonance will occur, causing the cabinet to rumble. To avoid this, increase the rigidity of the lower case and firmly fix the speaker box.
This not only increases production costs but also increases the weight of the musical instrument itself, impeding its portability.

Furthermore, in the case of electronic musical instruments, due to the arrangement of controls and various parts on the panel, if the volume of the speaker box is increased while remaining in the original box like in a general speaker system, the operation on the panel will be difficult. There were also problems in that it became impossible to arrange the components, electrical parts, and mechanical parts, and the size of the instrument itself became 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 that extends the bass range and has flat frequency characteristics without resonance or chatter.

[0008]

[Means for Solving the Problems] In order to achieve the above object, the present invention extends into a space within the main body of an electronic musical instrument, and electrical parts and mechanical parts disposed therein, as shown in FIG. A casing 1 having an uneven shape corresponding to the shape of the space to be avoided.
This invention provides a speaker box for an electronic musical instrument consisting of 1.

In the speaker box for the electronic musical instrument shown in FIG. 1, at least the portion of the housing 11 having the speaker mounting opening 11b and the uneven portion are made of synthetic resin material, as shown in FIG. We also offer products that are integrally molded.

0010

[Function] The speaker box of the electronic musical instrument according to the present invention has a housing that avoids the parts arranged inside the instrument body and has an uneven shape that corresponds to the shape of the space. It can accommodate a large-volume speaker box, extend the bass range, and provide a flat frequency response. At the same time, the strength of the casing with the uneven shape is greatly improved, making it possible to reduce the plate thickness and weight, as well as avoid resonance at specific frequencies due to plate vibration, allowing high peaks to be produced. prevent the occurrence of
A flat frequency characteristic can be obtained.

Furthermore, if at least the portion of the housing having the speaker mounting opening and the uneven portion are integrally molded, the structure of the speaker box is simplified and it is easier to prevent vibration.

0012

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 14.

FIG. 14 is a plan view of a portable keyboard electronic musical instrument embodying the present invention. This keyboard electronic musical instrument has a keyboard section 2 on the front half of the instrument body 1, and a panel surface 3 on which various operators and a display section are arranged on the rear half. Speaker panels 4 and 5 are provided. A first speaker box 10 is located at the lower left end side of the keyboard section 2 and panel surface 3 of the musical instrument body 1 at the position shown by the imaginary line in the figure.
and a second speaker box 20 is built in at the bottom of the right end side of the panel surface 3. As is clear from the figure, the first speaker box 10 is connected to the second speaker box 2.
The volume is set larger than 0, and each speaker faces the first and second speaker panels 4 and 5.

The first speaker box 10 shows one embodiment of the present invention, and as shown in FIG.
The housing 11 is integrally molded from 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. A speaker mounting opening 11b is formed to attach the main speaker 13, and a port opening 11 is adjacent to the main speaker 13.
c and the tweeter 14 is attached adjacent to these.

[0015] The instrument body 1 is adjacent to the surface 11a of the housing 11.
Below the panel surface 3 is a lower surface 1 that extends into the space within the instrument body 1, avoiding various electrical and mechanical components.
1d, and ribs 11e for reinforcement and resonance prevention on the back side.
will be established. In addition, a surface 11f is formed below the keyboard part 2 to avoid the keyboard mechanism and is further lowered to increase the internal volume of the housing 11 as much as possible, and to strengthen the surface of the housing 11 and prevent resonance. It forms a concave and convex shape that also serves as a surface. moreover,
A pair of insertion holes 11g, 11g are provided in the housing 11 so that legs protruding from the keyboard frame can be inserted in order to fix the keyboard frame and the bottom plate (not shown), and screw holes 11h are provided in multiple locations in the housing 11. The back plate 12 provided and fitted from below is firmly screwed to the housing 11.

The back plate 12 has a flat plate shape as shown in FIG. 6, and a sound absorbing material such as glass wool is adhered to the inner surface thereof. Then, the first speaker box 10 configured as described above is fixedly installed at the left end inside the musical instrument main body 1 shown in FIG. 14.

On the other hand, the second speaker box 20 consists of a housing 21 and a back plate 22, as shown in FIGS. 7 and 8. The housing 21 is integrally molded from a synthetic resin material, and is shown in FIG.
As shown in FIGS. 9 to 11, a surface 21a slightly inclined toward the front is provided opposite the second speaker panel 5 of the musical instrument body 1 shown in FIG. 1, and a speaker mounting opening 21b is formed in the surface 21a. The main speaker 23 is attached to the main speaker 23, and the tweeter 24 is mounted adjacent to the main speaker 23 by a pair of bosses 21c, 21c.
Attach the. Furthermore, a one step downward surface 2 is provided in the lower part of the panel surface 3 adjacent to the surface 21a and extends into the space within the musical instrument body 1, avoiding various electrical components and mechanical components within the musical instrument body 1.
Form 1d.

The housing 21 also includes a power switch relief 21e (not shown), a leg relief 21f of the frame reinforcing member,
Floppy disk drive device fixing bracket leg relief 21g
, 21g, etc. are formed to form an uneven shape that serves both to strengthen the strength and prevent resonance. Further, screw holes 21h are provided at a plurality of locations in the housing 21, and the back plate 22 is fitted from below and firmly screwed.

The back plate 22 is integrally formed with a port opening 25 facing upward as shown in FIGS. 8 and 13, and its position on the plane is set as shown by the imaginary line in FIG. The second speaker box 20 configured in this manner
is fixedly installed at the right end inside the musical instrument main body 1 shown in FIG.

[0020] This embodiment has the above configuration,
The first speaker box 10 has a much larger volume than the second speaker box 20. In the case of a speaker box with a large volume like this, port opening 1
Even if the 1c is installed close to the main speaker, there is no risk of a peak occurring in the bass range, and the larger the volume, the better the bass characteristics will be.

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

[0022] Furthermore, since the surface of the casing 11 has an uneven shape that avoids each component, it does not resonate at a specific frequency and generate high peaks unlike a speaker box with a flat wall. , the peaks are dispersed in multiple parts and exhibit flat characteristics as a whole.

Furthermore, because of the unevenness formed on the surface of the housing, it has higher rigidity than a speaker box made of a flat surface, and even if the thickness is made thinner, resonance can be effectively prevented, making it possible to reduce the weight of the speaker box. become.

Furthermore, since the speaker box is a one-box type consisting of two parts, the housing and the back plate, which are integrally molded, the structure is simpler than the conventional two-box type, and there is only one joint. This makes it possible to easily prevent chatter from occurring at the joint.

On the other hand, the second speaker box 20 has a smaller volume than the first speaker box 10 described above. In a speaker box with such a small volume, if the port opening is placed close to the speaker in a bass reflex type in order to extend the bass range, a peak will occur near the lowest resonant frequency (200Hz) as shown in Figure 18. I know that.

[0026] Therefore, this second speaker box 2
0, a port opening 25 is provided in the back plate 22 on the opposite side to the speaker mounting surface 21a, and the port opening 25 is spaced apart from the main speaker 23.

FIG. 17 is a diagram showing the frequency characteristics, and as shown in FIG. 19, the peak around the frequency of 200 Hz is flat, as seen in the frequency characteristics shown in FIG. 18, in which the port opening is provided adjacent to the speaker. It turns out that it is.

[0028] Also, the second speaker box 20 is also
Like the speaker box 10, it is a one-box type with an integrally molded housing 21, so the structure is simple and it is easy to prevent static. Since the shape of the molding die is simplified, mold processing becomes easy.

Furthermore, since the surface of the casing 21 has an uneven shape that matches the shape of the space that avoids various parts, there is no possibility of resonance at a specific frequency and generation of high peaks.
The peak is dispersed into multiple parts, exhibiting flat characteristics, and the rigidity is increased, allowing the thickness of the wall surface to be reduced without sacrificing strength, making it possible to reduce weight.

[0030] In the above embodiment, the first and second
A concave-convex shaped housing with an integrally molded speaker box,
Although the structure is made of two parts including the back plate, it is also possible to integrally mold these parts from one piece, or the first and second parts can be made of one piece.
The speaker box may be a closed type instead of a bass reflex type.

Further, in the above embodiments, the present invention is applied to a portable keyboard electronic musical instrument, but the present invention is not limited thereto, and can be applied to any type of electronic musical instrument.

[0032]

[Effects of the Invention] As described above, in the speaker box for an electronic musical instrument according to the present invention, the housing extends into the space within the instrument body, and the shape of the space is avoided by avoiding various parts arranged there. Since the speaker box has an uneven shape corresponding to the shape of the wall, the strength of the housing is significantly improved compared to a conventional speaker box having a flat wall surface. Therefore, the thickness of the casing can be made thinner and the weight can be reduced, and resonance at a specific frequency can be avoided and flat frequency characteristics can be obtained.

Furthermore, when at least the portion of the housing having the speaker mounting opening and the portion exhibiting the uneven shape are integrally molded, the structure of the speaker box is simplified and the prevention of vibration becomes easier.

[Brief explanation of the drawing]

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 the first speaker box housing.

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

FIG. 5 is a sectional view taken along line AA in FIG. 2;

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

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

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

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

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

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

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

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

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

FIG. 15 is a diagram showing frequency characteristics when the portion below the keyboard of the first speaker box is removed.

FIG. 16 is a diagram showing frequency characteristics of the 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 in which the port opening of the second speaker box is provided on the speaker mounting surface.

FIG. 20 is a sectional view showing a state in which a speaker box of a conventional electronic musical instrument is attached.

FIG. 21 is a sectional view showing how another speaker box of a conventional electronic musical instrument is attached.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1... Electronic musical instrument main body, 2... Keyboard part, 3... Panel surface, 4... First speaker panel, 5... Second speaker panel, 10
...first speaker box, 11...casing of first speaker box, 11a...speaker mounting surface of first speaker box, 11c...port opening of first speaker box, 12...back of first speaker box Face plate, 13... Main speaker of first speaker box, 14... Tweeter of first speaker box, 20... Second speaker box, 21... Housing of second speaker box, 21a
...Speaker mounting surface of the second speaker box, 22...Back plate of the second speaker box, 23...Main speaker of the second speaker box, 24...Tweeter of the second speaker box, 25...Second speaker box port opening of

Claims (2)

[Claims] 1. A speaker box built into an electronic musical instrument main body, the speaker box extending into a space within the electronic musical instrument main body,
1. A speaker box for an electronic musical instrument, comprising a casing having an uneven shape corresponding to the shape of the space, avoiding electrical parts and mechanical parts disposed therein. 2. The speaker box for an electronic musical instrument according to claim 1, wherein at least a portion of the housing having a speaker mounting opening and a portion exhibiting an uneven shape are integrally molded from a synthetic resin material. A speaker box for electronic musical instruments.