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DESCRIPTION JPH04110091

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DESCRIPTION JPH04110091
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
back cavity structure of a speaker, and more particularly to a back cavity structure suitable for a
medium sound speaker.
[0002]
2. Description of the Related Art FIGS. 2 and 3 show an example of the back cavity structure of a
conventional speaker, in which 1 is a speaker unit, and its frame 2 is attached to a baffle 3 with a
mounting screw 42, The back cavity C is attached to the back side of the baffle 3 with a
mounting screw 43, and the sound absorbing material 5 is accommodated inside. In the back
cavity C, a sound wave is absorbed by the action of the sound absorbing material 5, and the
resonance and the standing wave are prevented. On the other hand, various inventions have been
made to obtain good frequency characteristics by keeping the sound wave blocking and volume
and shape at the back of the speaker unit in an optimum state. In the example of FIG. 2, in the
back cavity C, the conical cylindrical peripheral wall portion 8a, the back surface portion 8b, and
the mounting flange portion 8c are integrally formed of thermoplastic resin such as ABS or
polystyrene resin. Further, in the example of FIG. 3, the back cavity C is configured by bonding a
paper-made cylindrical member 9 a, a wooden back member 9 b and a mounting flange member
9 c.
[0003]
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However, in the back cavity structure of the speaker shown in FIG. 2, since the back cavity C is
formed of a thermoplastic resin, it is inexpensive in terms of cost, but it is sufficient. However,
there is a disadvantage that the back cavity vibrates or resonates due to the sound pressure of
the speaker. Further, in the back cavity structure of the speaker shown in FIG. 3, vibration or
resonance occurs at the joint portion between the paper cylindrical member 9a and the wooden
back member 9b, and the joint portion is reinforced or provided with anti-vibration measures.
There was a drawback such as the need. As for the whole mounting means, the speaker unit 1
and the baffle 3 and the baffle 3 and the back cavity C are mounted by separate mounting screws
42 and 43, so the number of parts is increased and the number of steps is reduced also in the
assembly process Was unable to
[0004]
The object of the present invention is to solve the above-mentioned drawbacks of the
conventional back cavity and to be easy to assemble as well as easy to adjust the volume or
depth, and to make adjustment for obtaining good frequency characteristics. It is an object of the
present invention to provide a speaker back cavity structure that can be easily implemented.
[0005]
SUMMARY OF THE INVENTION The back cavity structure of a speaker according to the present
invention comprises a stacked cylindrical peripheral wall member in which one opening is in
contact with the back side of the speaker baffle and the peripheral wall A disc-like member for
closing the other opening of the member, and the peripheral wall member and the disc-like
member have a dividing through hole, and a tightening and fixing member such as a screw
inserted from the through hole is used. The frame of the speaker unit is fixed together by means
of a baffle.
In this case, ring-shaped members made of the same material or different materials may be
stacked as the peripheral wall members, or the stacked plate materials may be formed by
laminating holes into a ring shape. In addition, as a fixing means, in order to fix more firmly, the
peripheral wall member may be adhesively fixed to the baffle.
[0006]
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[Functions] A sound-absorbing material is accommodated in the peripheral wall member and a
fastening / fixing member such as a screw is inserted into a through hole formed through the
disk-like member and the peripheral wall member, and the frame of the speaker unit Fasten and
fix. In this case, an adhesive may be applied to the joint between the disk-shaped member and the
peripheral wall member and between the peripheral wall member and the baffle to increase the
fixing strength. When the ring-shaped members are stacked to form the peripheral wall
members, it is preferable to apply an adhesive between the ring-shaped members.
[0007]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The preferred embodiment of the
present invention will be described with reference to FIG. 1. In the figure, the speaker unit 1, the
frame 2, the baffle 3 and the sound absorbing material 5 etc. Is the same as In the present
invention, the back cavity C closes the stacked cylindrical peripheral wall member 6 and the
other opening 6b of the peripheral wall member 6 in which the one opening 6a is in contact with
the back side of the baffle 3 The peripheral wall member 6 and the disk-like member 7 have a
divided through hole 10, and the tightening and fixing member 4 such as a screw 41 is inserted
from the through hole 10 to the above-mentioned. The frame 2 of the speaker unit 1 is fixed
together via the baffle 3.
[0008]
The peripheral wall member 6 is formed by laminating ring-shaped members 61, 62, 63. In the
embodiments, wood-based particle boards are used for the ring members 61, 62, 63 and the disk
member 7. However, even if each ring member 61, 62, 63 is a single layer, the laminate is
formed in a ring shape. May be. The ring-shaped members do not have to be the same material,
and the frequency characteristics can be adjusted using inorganic materials such as metals,
synthetic resins, cement, etc. of different materials. Through holes 10 are formed in the disk-like
member 7 and the peripheral wall member 6 at dividing positions corresponding to the mounting
holes 2 a of the frame 2, and the baffle 3 is also formed with corresponding insertion holes 3 a. .
[0009]
During assembly, the sound absorbing material 5 is accommodated in the peripheral wall
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member 6, and the joint portion between the ring members 61, 62 and 63, the joint portion
between the peripheral wall member 6 and the discoid member 7, and the peripheral wall
member 6 An adhesive is applied to one of the openings 6a, and a screw 41 is inserted from the
through hole 10 to tighten and fix the frame 2. Although the screw 41 is inserted from the back
side in the embodiment, it is of course possible to insert the screw 41 from the front side and fix
it.
[0010]
According to the back cavity structure of the speaker of the present invention, the back cavity is
composed of a cylindrical peripheral wall member and a disk-like member for closing the back
opening, and the peripheral wall member is a ring-shaped member. Since it is configured to be
laminated, the depth and volume can be easily adjusted by appropriately setting the number of
laminated members. In addition, the ring-shaped members made of different materials can be
combined as the peripheral wall members, and the sound quality can be improved, and the
rigidity can be enhanced to reduce the vibration and the resonance. Furthermore, when
assembling, the fixing and fixing members are inserted from the through holes provided in the
disk-like member and the peripheral wall member and the frame of the speaker unit is fastened
together via the baffles. As the attachment can be performed simultaneously, the number of
assembling steps can be reduced and the number of parts of the fastening and fixing member
such as a screw can be reduced. 【0010】
[0011]
Brief description of the drawings
[0012]
1 is a cross-sectional view showing an embodiment of the back cavity structure of the speaker
according to the present invention.
[0013]
2 is a cross-sectional view showing the back cavity structure of the conventional back cavity
integral molding.
[0014]
3 is a cross-sectional view showing a back cavity structure using a conventional paper tube
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peripheral wall member.
[0015]
Explanation of sign
[0016]
1 is a speaker unit 2 a frame 3 a baffle 4 a clamp fixing member 5 a sound absorbing material 6
a peripheral wall member 7 a disc-like member 10 through holes 61 62 63 ring-shaped members
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