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JP2010068171

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DESCRIPTION JP2010068171
The present invention relates to the structure of a speaker device, which prevents sound leakage
to the back of the speaker, enables adjustment of bass reproduction capability, and realizes a
configuration in which a speaker box is eliminated. A speaker device according to the present
invention has at least one acoustic tube 12 disposed in an internal space of a frame 11, and the
tip of the acoustic tube 12 protrudes upward from the side surface of the frame 11. The frame
11 has a shape excluding a gap or a hole other than the insertion portion of the acoustic tube.
The rear of the diaphragm 6 is the portion excluding the acoustic tube 12 and the internal space
is a substantially enclosed space. With this configuration, sound leakage to the rear of the
speaker can be prevented, and by setting the sound pipe length appropriately, adjustment of the
reproduction capability of a predetermined bass can also be performed. [Selected figure] Figure 1
Speaker device
[0001]
The present invention relates to a speaker device used particularly for a living space made of a
building material such as a house, an apartment and an office building.
[0002]
A speaker device mounted in the ceiling or wall of a conventional house or office will be
described with reference to FIGS. 6 (a) to 6 (e).
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6 (a) is a perspective view from the upper surface of the speaker which is the main body of the
speaker device, FIG. 6 (b) is a top view thereof, and FIG. 6 (c) is an AA 'sectional view of FIG. 6 (d)
is a cross-sectional view taken along the line BB 'of FIG. 6 (b), and FIG. 6 (e) is an explanatory
view of a speaker device on which the speaker is mounted.
[0003]
According to the figure, 1 is a frame having a plurality of holes made of steel or the like, and a
magnetic circuit 2 in which a lower plate 2a, an annular magnet 2b and an upper plate 2c are
adhesively bonded is joined to the frame 1 There is.
[0004]
A magnetic gap 2f is provided between the inner peripheral side surfaces of the lower plate 2a
and the upper plate 2c of the magnetic circuit 2, and a cylindrical voice coil bobbin 3 around
which the voice coil 4 is wound is disposed at the lower portion.
[0005]
Reference numeral 5 denotes a support portion, and the inner periphery is adhesively bonded to
the voice coil bobbin 3 and the outer periphery is adhesively bonded to the frame 1 to hold the
voice coil bobbin 3 at the center of the magnetic gap 2f.
[0006]
Further, a diaphragm 6 is joined to the upper portion of the voice coil bobbin 3, and a dust cap 8
for dust protection is joined to a central portion (upper portion of the cylindrical voice coil
bobbin 3) of the diaphragm 6. There is.
[0007]
Furthermore, an edge portion 7 is joined to the outer periphery of the diaphragm 6, and the side
of the edge portion 7 not joined to the diaphragm 6 is joined to the frame 1.
[0008]
Reference numeral 9 denotes a hollow port integrally formed on the frame 1.
[0009]
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The speaker 10 configured as described above is attached to the speaker box A to constitute a
speaker device.
[0010]
The speaker box A on which the speaker 10 is mounted is entirely shielded except for the
mounting portion of the speaker 10. By mounting the speaker 10, the inside and the outside are
shielded except the port 9, and a speaker device is formed. .
[0011]
As prior art document information related to the invention of this application, for example,
Patent Document 1 is known.
JP-A-58-33393
[0012]
However, in the above-described conventional speaker apparatus, when used for the ceiling or
wall of a house or office, the use of the speaker box A can prevent sound leakage to the next
room or the floor, but the cost of the speaker box 11 is high. The problem is that the overall size
of the system also increases.
[0013]
When the speaker box A is not used, sound leakage can not be prevented, and the sound in the
back direction of the speaker 10 is in reverse phase. There is a problem that deterioration of the
sound occurs due to the cancellation of the sound of the opposite phase and the sound of the
opposite phase.
[0014]
The present invention solves the above-mentioned conventional problems, and to provide a
speaker capable of adjusting the reproduction capability of bass while preventing the
deterioration of the reproduced sound due to the antiphase sound without using the speaker box
A. It is the purpose.
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[0015]
In order to solve the above problems, the speaker device according to the present invention has a
bottomed frame having an open end, and the open end is joined by a diaphragm and the edge
portion to seal an inner space of the frame. In the speaker device, an acoustic pipe is disposed in
the enclosed space, and a tip end portion of the acoustic pipe is protruded from the frame so that
a sound emission direction is the same as a vibration direction of the diaphragm. The sound pipe
reverses the phase of the sound in the back direction of the diaphragm by 180 ° and the sound
emission direction is the same as the sound emission direction of the speaker to enhance sound
pressure and prevent sound leakage to the other side. Furthermore, by appropriately setting the
length of the acoustic tube, it is possible to enhance a predetermined bass range, and to provide a
small and inexpensive speaker device.
[0016]
The speaker device according to the present invention is able to confine the sound of the
opposite phase without using a speaker box by providing the acoustic tube inside the frame of
the sealed structure, and has the effect of being able to reduce the cost and the size of the entire
system. By changing the inner volume of the frame and the cross-sectional area and length of the
acoustic tube, it is possible to easily adjust the bass reproduction of the system.
[0017]
Hereinafter, a speaker device according to an embodiment of the present invention will be
described with reference to FIGS. 1 to 5B.
[0018]
In the description, the same parts as in the prior art will be assigned the same reference
numerals and descriptions thereof will be omitted.
[0019]
First Embodiment The invention according to the first aspect of the present invention will be
described below with reference to the first embodiment.
[0020]
FIG. 1 is a structural cross-sectional view of a speaker device according to a first embodiment of
the present invention, and FIG.
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[0021]
According to the drawing, reference numeral 11 denotes a bottomed frame provided with a hole
for mounting the magnetic circuit 2 at the center, the upper side of which is an opening, and the
frame 11 has a hole 11a for inserting an acoustic tube 12 described later. It is provided on the
side.
Except for the hole 11a and the hole at the center of the bottom, the frame 11 is not subjected to
other holes or similar processing.
[0022]
Therefore, the magnetic circuit 2 is adhesively bonded to the frame 11 so as to cover the opening
of the frame 11, the inner periphery of the diaphragm 6 is adhesively bonded to the voice coil
bobbin 3, and the outer periphery is through the edge 7. The diaphragm 6 and the diaphragm 6
are adhesively bonded to the open end of the frame 11 and the outer periphery of the dust cap 8
and the diaphragm 6 are bonded so as to cover the upper opening of the cylinder of the voice
coil bobbin 3. The space formed by the frame 11 is substantially sealed except for the holes 11a.
[0023]
The sound tube 12 inserted through the hole 11a of the frame 11 is bent in the movement
direction (vertical direction) of the diaphragm 6, and the sound generation on the back side of
the diaphragm 5 is performed on the outer periphery of the frame 11. It will be emitted upward
from the gap.
[0024]
The acoustic tube 12 is a rectangular tube made of metal or resin, and at least one or more are
disposed in the internal space of the frame 11.
[0025]
In the present embodiment, the acoustic tube 12 is securely fixed on the frame 11, and the
vibration of the diaphragm 6 does not cause an abnormal operation including the vibration.
[0026]
According to this configuration, the frame 11 is not provided with a gap, a joint, or a hole other
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than a hole for causing the tip of the acoustic tube 12 to protrude, so when the diaphragm 6 is
driven (vertical vibration) The sound emitted from the acoustic tube 12 is directed upward, which
makes it possible to prevent sound leakage to the rear of the speaker.
[0027]
Further, the cross-sectional area and the length of the sound tube 12 can be appropriately
selected, and adjustment of the bass reproduction capability can be performed using resonance
sound in the sound tube 12 by utilizing the principle of Helmholtz resonance.
[0028]
In addition, as a shape of the acoustic pipe 12, it is not necessary to be necessarily the abovementioned rectangular cylinder, and it is possible to acquire the same effect, even if it is other
shapes including a cylinder.
[0029]
Second Embodiment The second embodiment is another embodiment different from the abovedescribed first embodiment, and in particular, the invention of the speaker device according to
claim 2 will be described. a) is a top view of the speaker device according to the other
embodiment, FIG. 3 (b) is a cross-sectional view taken along the line AA 'in FIG. 3 (a), and FIG.
FIG.
[0030]
According to this figure, the difference from the first embodiment is that the slit 17a of the edge
and the slit 21a of the frame according to the shape of the tip of the acoustic tube 12 are
provided on the outer periphery of the edge 17 and the outer periphery of the frame 21. They
are respectively provided, and the tip of the acoustic tube 12 is a point joined to the slits 17a and
21a.
[0031]
With this configuration, by supporting the acoustic tube 12 at a plurality of locations, the sense
of stability of the acoustic tube 12 is increased, and the tip of the acoustic tube 12 protrudes
outward from the outer peripheral portion of the frame 21. And the appearance from the front of
the speaker has no sense of incongruity.
[0032]
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FIG. 4 is a development example of the speaker device of the present embodiment, in which the
diaphragm is a flat diaphragm 6a.
By making the diaphragm 6a flat, the present embodiment in which the acoustic tube 12 is not
protruded outward from the frame 21 is more comfortable.
[0033]
Furthermore, in the speaker device according to the present embodiment and the developed
example, the tip of the acoustic tube 12 or the slit 17a or the slit 21a is breathable having the
same color or pattern as the diaphragm 6 or 6a. By joining the cloth or the sheet member, the
speaker device itself and the slit portion can be made inconspicuous, and the interior of the living
space can be maintained.
[0034]
Third Embodiment A third embodiment describes a speaker apparatus according to another
embodiment which is different from the first embodiment and the second embodiment.
Particularly, the third to fourth aspects of the present invention are described. FIG. 5 (a) is a
structural cross-sectional view of the speaker device according to the other embodiment of the
present invention, and FIG. 5 (b) is a structural cross-sectional view of the speaker device
according to the same development example. is there.
[0035]
The difference between this embodiment and the first and second embodiments will be described
with reference to this figure. This embodiment does not have the edge portion 7 and directly
connects the outer peripheral portion of the frame 21b and the flat diaphragm 6b. It is in the
point where it joined.
[0036]
With this configuration, the speaker can be made more inconspicuous, and when the speaker is
installed on a ceiling or a wall, the appearance of the living space is not impaired.
[0037]
In the present embodiment, an inner magnet type magnetic circuit 2d is used.
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[0038]
Further, as in the speaker device of the expanded example shown in FIG. 5B, by attaching a
molding 23 made of a breathable material such as cloth to the tip of the acoustic tube 12, an
adjacent ceiling material or wall material 30 can be obtained. Can conceal the end face of the
speaker and make the speaker device less noticeable, and when the speaker device is installed on
a ceiling or a wall, the speaker device does not stand out as a wall or a part of the ceiling. It is
also possible to unify the appearance of
[0039]
In the speaker device according to the present invention, the acoustic tube is disposed in the
internal space of the frame having the sealed structure, so that deterioration of the sound due to
the negative phase sound of the diaphragm and the back of the speaker can be achieved without
using the speaker box. It is possible to reduce the cost of the speaker box by preventing the
sound leakage of the sound and adjusting the reproduction ability of the bass, and the residence
composed of building materials such as a house, an apartment, an office building, etc. It is also
useful as a speaker used in a space or an audio device mounted on an AV device such as a
television.
[0040]
FIG. 3B is a cross-sectional view of the structure of the speaker device according to the
embodiment of the present invention. FIG. 3A is a plan view of the speaker according to the
second embodiment of the present invention. -Structural cross-sectional view in -A 'Structural
cross-sectional view of another speaker in the embodiment (a) Structural cross-sectional view of
the speaker in the third embodiment of the present invention (b) Structural cross-section of the
other speaker in the same embodiment Figure (a) Perspective view of a conventional speaker, (b)
Top view, (c) Cross-section of structure in AA 'of Figure 6 (b), (d) BB of Figure 6 (b) (E) a
perspective view of a conventional speaker device
Explanation of sign
[0041]
Reference Signs List 2 magnetic circuit 3 voice coil bobbin 4 voice coil 5 support portion 6
diaphragm 7, 17 edge portion 11, 21, 21b frame 12 acoustic tube 17a, 21a slit
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