JP2011061334A - Speaker box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker box in which an audio-visual area at a weak sound pressure level is not produced even in the corner part of a space, in which the number of members is reduced even when installed on a sidewall surface, a ceiling surface, and the corner part, and its manufacturing cost is reduced. <P>SOLUTION: The speaker box 10 is constituted of: a speaker box body 11 presenting a four-divided, truncated octagonal pyramid; and a cover body 12 fitted to the speaker box body 11. The speaker box body 11 is constituted of: a speaker attachment plate 13 in which baffle plates 13a, 13b that present two trapezoidal shapes to attach a speaker 1 are connected; a section plate 14a where a fitting groove 19 is formed; a section plate 14b where a projection part 20 is formed; and a bottom surface plate 15. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a speaker box, and more particularly to a speaker box that employs a multi-speaker configuration and can emit sound over a wide viewing range.

  As a speaker box, a speaker box is generally formed in a polygonal shape such as a quadrangle or a pentagon, and a required number of speakers are incorporated therein (see, for example, Patent Documents 1 to 4).

Among these, for example, speaker boxes shown in FIGS. 11 to 13 are known as speaker boxes in which a plurality of speakers are accommodated to expand the viewing area.
FIG. 11 shows that two speakers 1A and 1B are housed in a speaker box 50 having a square cross section by rotating the acoustic axes 2A and 2B by 90 ° in the horizontal direction. It is attached to the baffle plates 3a and 3b (crossing angle 90 °).
FIG. 12 shows that two loudspeakers 1A and 1B are housed in a speaker box 60 having a regular pentagonal cross section by rotating the acoustic axes 2A and 2B by 72 ° in the horizontal direction, and adjacent two baffle plates 3a. , 3b (crossing angle 105 °).
FIG. 13 shows two speaker 1A, 1B in the same hexagonal speaker box 70 with two baffle plates adjacent to each other by rotating the acoustic axes 2A, 2B by 60 ° in the horizontal direction. It is attached to 3a, 3b (crossing angle 120 °).
Here, as the speakers 1A and 1B, speakers having horizontal directivity of 60 ° are used.

However, in the above-described conventional speaker boxes 50, 60, 70, the sound radiated from the respective speakers 1A, 1B does not overlap, so that a sound valley is present between the sound fields (sound radiating areas) of both speakers 1A, 1B. There is a problem that (a viewing area with a low sound pressure level) is created and the viewing position is limited.
That is, in the case of the speaker box 50 shown in FIG. 11, since the acoustic axes 2A and 2B of the sound radiated from the speakers 1A and 1B intersect at an angle of 90 °, the two sound radiation areas 4A and 4B are formed. In the meantime, a viewing area (shaded portion) 5A having a low sound pressure level is generated.

  Similarly, in the speaker boxes 60 and 70 shown in FIGS. 12 and 13, viewing areas (shaded portions) 5B and 5C having a low sound pressure level are generated.

  Therefore, the applicant of the present application can expand the viewing area without generating a viewing area with a low sound pressure level, while having a relatively simple structure, in order to solve such a conventional problem. The speaker box 80 which exhibits the half shape of the truncated octagonal pyramid shown in Fig. 14 was developed (see Patent Document 5).

  When this speaker box 80 is installed on the side wall surface or ceiling surface, the sound emission areas 4A and 4B of the adjacent speakers 1A and 1B are overlapped with each other so that a viewing area with a low sound pressure level does not occur, and the speaker box 81 is centered. It is possible to create a half or half spherical sound field.

JP-A-11-225389 JP 2000-077862 A JP 2000-125381 A JP-A-11-98588 JP 2006-304189 A

However, theaters, movie theaters, banquet halls, athletic clubs and the like in which speaker boxes are installed are generally rectangular parallelepiped spaces and have a considerably large volume, so that the speaker box 80 having the truncated octagonal pyramid shape described above is used. Even if it is installed on the ceiling surface of the central part, a viewing area with a low sound pressure level inevitably arises at the corners.
Further, according to the speaker box 80 having the half shape of the truncated octagonal pyramid, a speaker box installed on the side wall surface or the ceiling surface can be configured, but a speaker box installed on the corner corner portion is separately prepared. In order to construct three types of speaker boxes, the number of members has to be increased, and the manufacturing cost cannot be reduced.

The present invention has been made to solve such a problem, and the object of the present invention is to further improve the speaker box having the truncated octagonal pyramid shape, and to increase the volume of the space. Even in the corners, a viewing area with a low sound pressure level is not generated, and even if three types of speaker boxes are installed on the side wall, ceiling, and corners, the number of members constituting them can be reduced. Another object of the present invention is to provide a speaker box that can reduce the manufacturing cost.

  In order to achieve the above object, the present invention provides a speaker mounting plate that connects two trapezoidal baffle plates for mounting a speaker, a partition plate that forms a fitting groove, a partition plate that forms a protrusion, The speaker box is composed of a speaker box body having a quadrant shape of a truncated octagonal pyramid composed of a bottom plate and a lid body fitted to the speaker box body.

  Here, the crossing angle α between the baffle plates was set to 135 °, the crossing angle β between the baffle plate and the partitioning plate was set to 67.5 °, and the crossing angle between the partitioning plates was set to 90 °. Features.

Moreover, it is preferable to set the crossing angle γ between the baffle plate and the vertical plane to 15 to 45 °.

It is a disassembled perspective view of one Embodiment of the speaker box of this invention. It is a top view of the speaker box shown in FIG. It is a side view of the speaker box shown in FIG. It is horizontal direction sectional drawing of the state which installed the speaker box shown in FIG. 1 in a corner corner part. FIG. 2 is a vertical cross-sectional view in a state where the speaker box shown in FIG. 1 is installed at a corner portion. It is a disassembled perspective view of the speaker box which exhibits the half shape of the truncated octagonal pyramid comprised by connecting the speaker box of this invention. It is horizontal direction sectional drawing of the state which installed the speaker box shown in FIG. 6 in the side wall surface. It is a disassembled perspective view of the speaker box which exhibits the truncated octagonal pyramid shape comprised by connecting the speaker box of this invention. It is horizontal direction sectional drawing of the state which installed the speaker box shown in FIG. 8 on the ceiling surface. It is a see-through | perspective perspective view of the indoor space which installed the speaker box of this invention in the ceiling surface and the corner corner part. It is a figure explaining the sound radiation area of the conventional regular square speaker box. It is a figure explaining the sound radiation area of the conventional regular pentagon speaker box. It is a figure explaining the sound radiation area of the conventional regular hexagon speaker box. It is a disassembled perspective view of the speaker box which exhibits the half shape of a truncated octagonal pyramid. It is horizontal direction sectional drawing of the state which installed the speaker box which exhibits the half shape of a truncated octagonal pyramid in the side wall surface. It is horizontal direction sectional drawing of the state which installed the speaker box which exhibits a truncated octagonal pyramid shape in the ceiling surface.

Hereinafter, preferred embodiments of the speaker box of the present invention will be described in detail with reference to the drawings.
FIG. 1 is an exploded perspective view of an embodiment of the speaker box of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a side view thereof.

  The speaker box 10 of the present invention is composed of a speaker box main body 11 and a lid 12 as shown in FIG.

The speaker box body 11 is formed by die-casting an alloy material such as an aluminum alloy.
The speaker box body 11 has a quadrant shape of a truncated octagonal pyramid, a speaker mounting plate 13 that connects two trapezoidal baffle plates 13a and 13b to which the speaker 1 is attached, and partition plates 14a and 14b. And the bottom plate 15.

The baffle plates 13a and 13b are formed with a step 16 at the upper end and a sound emitting hole 17 at the center. The partition plates 14a and 14b are formed by forming a boss portion 18 having a cylindrical four-divided shape at a connecting portion of each other, a fitting groove 19 in the partition plate 14a, and a protrusion 20 in the partition plate 14b. is there.
A rectangular opening 21 having an appropriate size is formed near the lower end of the boss 18.

The crossing angle α between the baffle plates 13a and 13b is set to 135 °, the crossing angle β between the baffle plate 13a and the partition plate 14a is set to 67.5 °, and the crossing angle between the partition plates 14a and 14b is set to 90 °. is there.
Further, the crossing angle γ between the baffle plates 13a, 13b and the vertical plane is preferably set to 15 to 45 °, particularly 30 °.

The lid 12 is made of an alloy material such as an aluminum alloy, and exhibits a regular octagonal quadrant shape.
Then, the lid body 12 is fitted to the step portions 16 of the baffle plates 13a and 13b, is placed on the upper end surfaces of the partition plates 14a and 14b, seals the opening of the speaker box body 11, and It is configured.

Next, the acoustic effect in a state where the speaker box 10 of the present invention is installed at a corner of the room will be described.
4 is a horizontal cross-sectional view of the speaker box 10 installed at the corner, and FIG. 5 is a vertical cross-sectional view of the speaker box 10 installed at the corner.

  When the speaker 1 is driven in the speaker box 10, the sound emitted from the speaker 1 is radiated with an angle of directivity of 60 °, but the sounds radiated from the two speakers 1 and 1 are both sidewall surfaces 2 and 2. And proceed substantially diagonally downward. Therefore, it does not hit the ceiling surface or the side wall surface immediately and is reflected, and the acoustic influence is small.

  On the other hand, since the crossing angle of the acoustic axes 3A and 3B of the two speakers 1 and 1 is 45 °, the sound radiation areas R1 and R2 of the two speakers 1 and 1 intersect and overlap at the point P1, and the overlapping region X1 In this case, the sound pressure level is slightly amplified. Therefore, a sound field having a weak sound pressure level does not occur, and the viewing area can be expanded.

  As shown in FIG. 4, when the speaker box 10 is installed at the corner, a pipe-shaped space is defined by the boss 18 and the corner, and a rectangular opening is formed in the boss 18. Since the opening portion 21 is perforated, the opening portion 21 functions like a back load horn, and the sound in the low range is radiated through the opening portion 21 so that the reproduction efficiency in the low range is high and the sound is cut off. A good sound can be obtained.

Next, the case where the two speaker boxes 10 of this invention are connected and the speaker box 30 which exhibits the half shape of a truncated octagonal pyramid is comprised is demonstrated.
FIG. 6 is an exploded perspective view of a speaker box 30 having a truncated octagonal pyramid halved shape formed by connecting the speaker boxes 10 of the present invention, and FIG. 7 is a horizontal view of the speaker box 30 installed on the side wall surface. FIG.

  A fitting groove 19 is formed in the partition plate 14a of the speaker box body 11 and a protrusion 20 is formed in the partition plate 14b. Therefore, the partition plate 14b of one speaker box body 11 and the partition of the other speaker box body 11 are formed. When the plate 14a is brought into contact with the projection portion 20 so as to be fitted into the fitting groove 19, a speaker box body 31 having a half shape of a truncated octagonal pyramid as shown in FIG. 6 can be configured.

The lid body can be constituted by connecting two lid bodies 12, but considering rigidity and assemblability, a lid made of a single plate having a regular octagonal half shape as shown in FIG. The body 32 is preferably employed.
The speaker box 30 is configured by fitting the lid 32 to the stepped portion 16 of the baffle plates 13a and 13b and placing it on the upper end surfaces of the partition plates 14a and 14b and sealing the opening of the speaker box main body 31. be able to.

  Next, the acoustic effect in a state where the speaker box 30 is installed on the side wall surface in the room will be described with reference to FIG.

  When the speaker 1 is driven in the speaker box 30, the sound emitted from the speaker 1 is radiated at an angle of 60 ° in the directivity characteristic, but the sound radiated from the speakers 1 and 1 located on both the left and right sides is the side. Proceeding diagonally downward substantially parallel to the wall surface 2. Therefore, it does not hit the ceiling surface or the side wall surface immediately, and is not echoed, and the acoustic influence is small.

  Since the crossing angle of the acoustic axes 3A and 3B, 3B and 3C, 3C and 3D of the two adjacent speakers 1 and 1 is 45 °, the sound radiation areas R1 and R2 and R2 of the two adjacent speakers 1 and 1 R3, R3, and R4 intersect and overlap at points P1, P2, and P3, and the sound pressure level is slightly amplified in the overlapping regions X1, X2, and X3. Therefore, a sound field with a low sound pressure level does not occur, the viewing area can be expanded, and a sound field that is substantially half of a hemisphere can be formed.

Next, a case where four speaker boxes 10 of the present invention are connected to form a speaker box 40 having a truncated octagonal pyramid shape will be described.
FIG. 8 is an exploded perspective view of a speaker box 40 having a truncated octagonal pyramid shape configured by connecting the speaker boxes 10 of the present invention, and FIG. 9 is a horizontal sectional view of the speaker box 40 installed on the ceiling surface. It is.

  Since the fitting groove 19 is formed in the partition plate 14a of the speaker box body 11 and the projection 20 is formed in the partition plate 14b, the partition plate 14b and the partition plate 14a of the adjacent speaker box body 11 are brought into contact with each other, If the protrusion 20 is inserted into the fitting groove 19, a speaker box main body 41 having a truncated octagonal pyramid shape as shown in FIG. 8 can be configured.

The lid can be configured by connecting four lids 12, but considering rigidity and assemblability, a lid 42 made of a single plate having a regular octagonal shape as shown in FIG. 8 is provided. It is preferable to adopt.
The speaker box 40 is configured by fitting the lid body 42 to the stepped portion 16 of the baffle plates 13a and 13b and placing it on the upper end surfaces of the partition plates 14a and 14b to seal the opening of the speaker box body 41. be able to.

  Next, the acoustic effect in a state where the speaker box 40 is installed on the ceiling surface of the room will be described with reference to FIG.

  When the speaker 1 is driven in the speaker box 40, the sound emitted from the speaker 1 is radiated at an angle of 60 ° in the directivity, but proceeds diagonally downward. Therefore, it does not hit the ceiling surface immediately and is reflected, and the acoustic influence is small.

  Since the crossing angle of the acoustic axes 3A and 3B of the two adjacent speakers 1 and 1 is 45 °, the sound radiation areas R1 and R2,. The sound pressure level is slightly amplified in the overlapping regions X1,. Therefore, a sound field with a weak sound pressure level does not occur, the viewing area can be expanded, and a hemispherical sound field can be formed.

As described above, the speaker box 10 of the present invention has a quadrangular shape of a truncated octagonal pyramid, and the intersection angle between the partition plates 14a and 14b is set to 90 °. Can be suitably installed.
The crossing angle α between the baffle plates 13a and 13b is 135 °, the crossing angle β between the baffle plate 13a and the partition plate 14a is 67.5 °, and the crossing angle γ between the baffle plates 13a and 13b and the vertical plane is 30 °. Therefore, the sound radiated from the speakers 1 and 1 is almost parallel to the side wall surfaces 2 and 2 and proceeds obliquely downward, and does not hit the ceiling surface or the side wall surface immediately, and does not reverberate. The impact is small.
Further, the sound radiation areas R1 and R2 of the two speakers 1 and 1 intersect and overlap each other, and the sound pressure level is slightly amplified in the overlap area X1, so that a sound field with a weak sound pressure level does not occur. The viewing area can be expanded.

The speaker box 10 of the present invention has a quadrangular shape of a truncated octagonal pyramid, and has a fitting groove 19 in the partition plate 14a and a protrusion 20 in the partition plate 14b. When the partition plate 14b and the partition plate 14a of the speaker box main body 11 are brought into contact with each other and the protrusion 20 is inserted into the fitting groove 19, the speaker box main bodies 41 and 31 exhibiting a truncated octagonal pyramid shape and a half shape thereof are obtained. Easy to configure.
Therefore, it is not necessary to separately prepare speaker boxes to be installed at the corners, and the number of members for constituting the three types of speaker boxes 10, 30, 40 that can be installed at the side wall surface, the ceiling surface, and the corners is reduced. Manufacturing cost can be greatly reduced.
If three types of speaker boxes 10, 30, and 40 are installed on the side wall surface, the ceiling surface, and the corner corners, the central portion, the side wall portions, and the corner corners even in a substantially large volume space having a substantially rectangular parallelepiped shape. In any of the sections, it is possible to prevent a viewing area having a low sound pressure level from being generated.

DESCRIPTION OF SYMBOLS 1 Speaker 10 Speaker box 11 Speaker box main body 12 Cover body 13 Speaker mounting plates 13a and 13b Baffle plates 14a and 14b Partition plate 15 Bottom plate 18 Boss portion 19 Fitting groove 20 Protruding portion 21 Opening portion 30 Speaker box 31 Speaker box main body 32 Cover body 40 Speaker box 41 Speaker box body 42 Cover body

Claims (6)

  A truncated octagonal pyramid composed of a speaker mounting plate that connects two trapezoidal baffle plates for mounting a speaker, a partition plate that forms a fitting groove, a partition plate that forms a protrusion, and a bottom plate. A speaker box comprising: a speaker box body having a quadrant shape; and a lid fitted to the speaker box body. The intersection angle α between the baffle plates is set to 135 °, the intersection angle β between the baffle plate and the partition plate is set to 67.5 °, and the intersection angle between the partition plates is set to 90 °. The speaker box according to claim 1. 3. The speaker box according to claim 1, wherein an intersection angle γ between the baffle plate and the vertical plane is set to 15 to 45 °. 4. The speaker box according to claim 1, wherein a boss portion is formed at a connecting portion between the two partition plates, and an opening is formed in the boss portion. The projection of the partition plate of the other speaker box body is inserted into the fitting groove of the partition plate of one speaker box body to constitute a speaker box body that has a half-shape of a truncated octagonal pyramid, and this speaker box body A speaker box having a halved shape of a truncated octagonal pyramid characterized by being configured by fitting a lid. A projection of the partition plate of the speaker box body adjacent to the fitting groove of the partition plate of the adjacent speaker box body is inserted to constitute a speaker box body having a truncated octagonal pyramid shape, and a lid is attached to the speaker box body A speaker box having a truncated octagonal pyramid shape characterized by being configured by fitting.

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