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JP2000209696

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2000209696
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
structure of a speaker unit, and in particular, a speaker which is easy to assemble and which can
enhance the magnetic flux of a speaker using a repulsive magnetic circuit and effectively
dissipate the heat generated from a voice coil. It relates to the structure of the unit.
[0002]
2. Description of the Related Art An example of a flat loudspeaker unit using a conventional
repulsive magnetic circuit is shown in FIG. 5 and FIG. The center pole 1a provided on the frame 1
shown in the figure sequentially inserts the magnet 6, the center plate 7 and the magnet 6, and
the mounting screw 9 having the flat washer 16 inserted therein is screwed into the center pole
1a.
[0003]
The magnetic circuit fixed to the center pole 1a in this manner forms a repulsive magnetic circuit
in which the magnets 6, 6 are arranged so that the same poles face each other and the magnetic
field is emitted outward from the outer periphery of the center plate 7. . The voice coil 8
disposed in the magnetic field is fixed to the inner periphery of the diaphragm 3, and the
diaphragm 3 is supported by the frame 1 via the edge 4. The voice coil 8 is connected to a
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terminal 11 fixed to the frame 1.
[0004]
The protector 15 made of punching metal is fastened to the baffle 10 by means of mounting
screws 9, 9... As shown in FIG. Alternatively, the protector is high frequency welded to the resin
grille, and the resin grille is fixed to the baffle.
[0005]
The above-described conventional speaker unit has a problem that the attachment of the
magnetic circuit and the attachment of the protector are performed in separate steps, so that the
number of manufacturing steps is increased and the manufacturing cost is increased. In addition,
there is a problem that the fixing strength is weak because the magnetic circuit is pressed and
fixed only by the mounting screw screwed into the center pole.
[0006]
Furthermore, since there is no member for attracting magnetic flux on the outside of the voice
coil, there is a problem that it becomes expensive to increase the magnetic flux density radiated
from the center plate. In addition, since the voice coil is directly fixed to the diaphragm and the
heat conducting member is not disposed on the outside of the voice coil, the heat dissipation is
poor and high output can not be obtained.
[0007]
The present invention has been made in view of the above-described point, and an object of the
present invention is to provide a structure of a speaker unit which can be manufactured at low
cost and can provide high output.
[0008]
SUMMARY OF THE INVENTION The structure of the speaker unit according to the present
invention is characterized in that a protector having a diaphragm with a voice coil fixed at its
center supported by an edge and a dustproof damper is fastened to a center pole provided on a
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frame. By being worn, a repulsive magnetic circuit through which the center pole is inserted is
pressed and fixed.
[0009]
Further, in the structure of the speaker unit, the protector and the frame are formed
concentrically, and a screw provided on one of the central axes is screwed into a screw hole
provided on the other central axis, thereby mounting the protector on the frame It is fastened to
the provided center pole.
[0010]
Further, in the structure of each of the speaker units, the protector is formed by applying a
pressure to the frame by inserting a plurality of support columns provided in the protector and
having a portion close to the voice coil with a magnetic body. Are firmly supported by the frame.
[0011]
Furthermore, in the structure of each of the speaker units, the protector is configured to hold the
lighting fixture of the speaker unit and the wiring thereof.
[0012]
Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a plan view showing a speaker unit according to a first embodiment of the present
invention, and FIG. 2 is a cross-sectional view showing the speaker unit.
The center pole 1a provided in the frame 1 shown in the figure passes through the magnet 6, the
center plate 7 and the magnet 6 sequentially.
The magnetic circuit fixed to the center pole 1a in this manner forms a repulsive magnetic circuit
in which the magnets 6, 6 are arranged so that the same poles face each other and the magnetic
field is emitted outward from the outer periphery of the center plate 7. .
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[0013]
The protector 2 made of aluminum is disposed on the front surface of the speaker unit to protect
the diaphragm 3, and a plurality of windows are widely opened to pass the sound radiated from
the diaphragm 3.
The outer peripheral portion of the diaphragm 3 is bonded to the edge 4, and the inner
peripheral portion is bonded to the dustproof damper 5.
[0014]
The outer peripheral portion of the edge 4 is bonded to a cylindrical edge mounting portion 2 c
provided to the protector 2, and the upper portion of the dustproof damper 5 is bonded to the
lower surface of the central portion of the protector 2.
Thus, the diaphragm 3 is supported by the protector 2 via the edge 4 and the dustproof damper
5. The voice coil 8 disposed in the magnetic field of the repulsive magnetic circuit is fixed to the
inner periphery of the diaphragm 3, and the voice coil 8 is connected to the terminal 11 fixed to
the frame 1. The dustproof damper 5 vibratably supports the diaphragm 3 and prevents foreign
matter from entering the magnetic gap.
[0015]
The protector 2 is further provided with eight inner support columns 2d concentrically, and
penetrates the hole 3a of the diaphragm 3 to extend downward, and the anti-vibration rubber 12
is fixed to the tip thereof. The portion of the inner support 2d adjacent to the voice coil 8 is
formed of magnetic material 2e by insert molding.
[0016]
Eight outer columns 2 f are provided concentrically on the outer peripheral portion of the
protector 2, and the anti-vibration rubber 12 is fixed to the tip thereof. A threaded portion 2a is
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formed at the center of the protector 2, and a cylindrical magnet pressing portion 2b is formed
on the outer side thereof.
[0017]
As described above, the speaker unit is completed by screwing the screw portion 2a of the
protector 2 to which the diaphragm 3 is attached into the screw hole provided at the center of
the center pole. Then, the magnetic circuit constituted by the magnets 6 and 6 and the center
plate 7 is pressed by the magnet pressing portion 2 b and firmly fixed to the center pole 1 a.
[0018]
The anti-vibration rubbers 12, 12 ... fixed to the inner support 2d and the outer support of the
protector 2 are in pressure contact with the frame 1, and the protector 2 is firmly fixed to the
frame 1. Furthermore, the magnetic body 2e disposed close to the voice coil 8 strengthens the
magnetic flux of the repulsive magnetic circuit and dissipates the heat generated from the voice
coil 8. The thus completed speaker unit is attached to the baffle 10 by means of the mounting
screws 9, 9... Through the holes provided in the frame 1.
[0019]
FIG. 3 is a plan view showing a speaker unit according to a second embodiment of the present
invention, and FIG. 4 is a sectional view showing the speaker unit. In this example, a neon lamp
13 is attached to the protector 2, and power is supplied by the wiring member 14 wound on the
protector 2. The other configuration is the same as that of the first embodiment. Since the
protector 2 has a support 2d extending toward the frame 1, wiring can be performed when the
speaker unit is assembled by winding the wiring member 14 thereon, thereby simplifying the
manufacturing process.
[0020]
Although it is popular to make the speaker unit put in the box shine with a neon light and make
it stand out with the recent car speakers, it is difficult to attach the neon light directly in the
conventional speaker unit, and it is mounted in places other than the speaker unit I was
illuminating through an acrylic board.
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[0021]
According to the present invention, the protector can be formed by injection molding, a lighting
fixture such as a neon light can be installed at a place where the lighting efficiency of the
protector is good, and the neon light and the wiring material can be covered. The wiring material
can be placed in the grooved area and can be routed to the back of the frame, and the connection
with the power supply can be simplified.
In addition, even if the speaker unit is not surrounded by an acrylic plate or a translucent cabinet,
illumination can be made to make the speaker unit stand out.
[0022]
According to the structure of the speaker unit of the present invention, the manufacturing cost
can be reduced by simplifying the manufacturing process. Also, the magnetic circuit can be
firmly fixed, and the magnetic flux of the magnetic circuit can be increased at low cost. And since
the heat generated by the voice coil can be dissipated efficiently, the sound quality and reliability
can be satisfied simultaneously. Furthermore, the appearance can also be excellent.
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