JPH0946783

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DESCRIPTION JPH0946783
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker, and more particularly, to a waterproof structure which extends along an air intake and
exhaust hole provided in a bottom yoke of the speaker and prevents water and dust from
entering the speaker from the rear end surface of the bottom yoke. It relates to a dustproof
structure.
[0002]
2. Description of the Related Art The structure of a conventional speaker will be described with
reference to FIG. Reference numeral 100 denotes a speaker, which includes a vibration unit, a
frame, a magnetic circuit unit, and the like. The vibrating portion is constituted by a diaphragm
111, a voice coil 112, a voice coil bobbin 113, a damper 116 and the like.
[0003]
The diaphragm 111 radiates vibration converted into mechanical vibration from the electrical
input signal input to the voice coil 112 as sound according to the input signal, and pulp, resin or
the like is used as the material. The central portion of the diaphragm 111 is adhesively fixed to
one end of the cylinder of the voice coil bobbin 113, the edge 117 is adhesively fixed to the
opening of the diaphragm 111, and the outer peripheral portion of the edge 117 is adhesively
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fixed to the frame 115 ing. In the voice coil bobbin 113 to which the diaphragm 111 is fixed, the
outer periphery of the voice coil bobbin 113 is bonded to the inner peripheral portion of the
damper 116 and the outer peripheral portion of the damper 116 is bonded to the frame 115. Is
suspendedly connected and fixed by the edge 117 and the damper 116.
[0004]
The voice coil bobbin 113 is formed in a cylindrical shape using a light member such as paper,
resin, or aluminum. A thin wire, such as insulated copper or aluminum, is wound around the
outer periphery of the cylinder to form a voice coil 112. The damper 116 supports the
diaphragm 111 so that the diaphragm 111 moves following the vibration of the voice coil bobbin
113, and resin, mixed spinning or the like is used as the material.
[0005]
The frame 115 is a member for holding the magnetic circuit portion and the vibration portion.
The vibration portion is bonded to the inside of the frame 115 and the magnetic circuit portion is
adhered and fixed to the rear (right side in the drawing). As a material, a rolled steel plate, an
aluminum die cast, a resin material or the like is used. The magnetic circuit part is composed of a
ring-shaped permanent magnet 125 (hereinafter abbreviated as magnet 125), bottom yoke 130,
top plate 123, etc. The magnetic circuit part adheres and fixes bottom yoke 130 and top plate
123 to both end faces of magnet 125. At this time, the center pole 131 of the bottom yoke 130 is
assembled so as to be at the center of the inner diameter of the magnet 125.
[0006]
In the bottom yoke 130, a flange portion 132 is formed on the end faces of the cylindrical center
pole 131 and the center pole 131, and the intake and exhaust holes 134 are penetrated in the
axial direction of the bottom yoke 130. A magnetic carbon steel material or the like is used as the
material of the bottom yoke 130, and after being formed by turning or the like, plating for rust
prevention is applied. The top plate 123 has a washer-like shape, and a rolled steel plate or the
like of a magnetic material is used as the material, and after being formed by press processing or
the like, plating for rust prevention is applied.
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[0007]
Next, the operation will be described. During rain or car wash, water droplets 106 penetrate the
inside of the door of the vehicle through the window glass 105 and the like. Then, the intruded
water droplet 106 falls on the rear end portion of the bottom yoke 130 of the speaker 100
mounted inside the door of the vehicle. Then, the falling water droplet 106 travels along the rear
end surface 135 of the bottom yoke 130 and reaches near the inlet of the intake and exhaust
holes 134. On the other hand, the external air is sucked into the interior of the speaker 100
through the intake and exhaust holes 134 by the amplitude operation of the diaphragm 111 of
the speaker 100 in the front-rear direction, or the air inside the speaker 100 is exhausted to the
outside. Then, the water droplets 106 reaching the vicinity of the inlet of the suction and
discharge hole 134 along with the suction action travel along the suction and discharge hole 134
and enter the inside of the speaker 100 and along the front end surface 133 of the bottom yoke
130 to reach the voice coil bobbin 113.
[0008]
However, in the above-described conventional structure of the speaker 100, the water droplets
106 invading the voice coil bobbin 113 inside the speaker 100 from the rear of the intake and
exhaust holes 134 penetrated by the bottom yoke 130 of the speaker 100. However, the voice
coil bobbin 113 may be absorbed and deformed. Then, the inner periphery of the deformed voice
coil bobbin 113 rubs against the outer periphery of the center pole 131 of the bottom yoke 130
to inhibit the amplitude operation of the diaphragm 111, causing a defect such as a reduction in
sound quality. As measures against these problems, a method such as attaching a waterproof
cover on the top of the speaker 100 is taken. However, depending on the type of vehicle, it may
be difficult to attach the waterproof cover. In addition, the cost of parts for attaching the
waterproof cover and the cost of the installation man-hour and the like increase, so there are cars
for which no countermeasure has been taken.
[0009]
Therefore, the present invention solves the above-mentioned problems, and it is an object of the
present invention to provide a waterproof speaker having a waterproof structure in which water
droplets do not intrude into the interior of the speaker even if water droplets invading into the
door interior of the vehicle .
[0010]
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SUMMARY OF THE INVENTION The present invention achieves the above-mentioned object, and
in a speaker in which an intake and exhaust hole is penetrated in a bottom yoke, a hole whose
diameter exceeds the hole diameter of the intake and exhaust hole from the rear end of the
bottom yoke. Is provided in such a manner as to be in communication with the intake and
exhaust holes in the direction of the front end of the bottom yoke.
[0011]
Further, in the speaker in which the intake and exhaust holes are penetrated in the bottom yoke,
the opening of the semi-cylindrical waterproof cover is inserted downward into the intake and
exhaust holes, and a part of the waterproof cover is rearward from the rear end face of the intake
and exhaust holes. It is characterized in that it is provided to protrude.
Further, in the speaker in which the intake and exhaust holes are penetrated in the bottom yoke,
a net-like cover is provided in the middle of the intake and exhaust holes.
[0012]
Further, in the speaker in which the intake and exhaust holes are penetrated in the bottom yoke,
a waterproof and dustproof cover integrating the waterproof cover and the net-like cover is
inserted into the intake and exhaust holes, and a part of the waterproof cover is a rear end face
of the intake and exhaust holes. It is characterized in that it is provided to project further
rearward.
[0013]
According to the present invention, the air intake and exhaust hole is a stepped hole in which the
small diameter hole and the large diameter hole are connected, and the large diameter hole is
provided toward the front end portion from the rear end portion of the bottom yoke. Because the
water drops from the upper part near the rear end face of the speaker, the water drops enter the
inside of the speaker at the step between the large diameter hole and the small diameter hole
even if the water droplets enter the large diameter hole. It can prevent.
[0014]
According to the second aspect of the invention, the waterproof cover inserted into the air
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suction and discharge hole projects rearward from the rear end face of the air suction and
discharge hole, so water droplets build up from the top of the bottom yoke and propagate along
the rear end face of the bottom yoke The water droplets are prevented from entering the air
intake and exhaust holes by the protrusion of the waterproof cover.
Therefore, the water droplets can be prevented from entering the inside of the speaker through
the air intake and exhaust holes.
[0015]
According to the third aspect of the present invention, even if water droplets or dust enter from
the rear end surface of the bottom yoke through the air intake and exhaust holes, the water
droplets and dust enter the inside of the speaker in the net-like cover provided in the middle of
the air intake and exhaust holes. To prevent
According to the fourth aspect of the invention, the waterproof cover portion of the waterproof
and dustproof cover inserted into the air intake and exhaust hole protrudes rearward from the
rear end face of the air intake and exhaust hole, so water drops are applied from the top of the
bottom yoke, the bottom The water droplets transmitted through the rear end face of the yoke
are prevented from entering the air intake and exhaust holes by the protruding portion of the
waterproof cover portion.
Further, the net-like portion of the waterproof and dustproof cover prevents water droplets and
dust entering from the rear end surface of the bottom yoke through the air intake and exhaust
holes from entering the inside of the speaker.
[0016]
Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is
a cross-sectional view showing the configuration of the basic structure of a vehicle-mounted
speaker. A speaker 1 comprises a vibration unit, a frame, a magnetic circuit unit, and the like. The
vibrating portion is constituted by the diaphragm 11, the voice coil 12, the voice coil bobbin 13,
the damper 16 and the like.
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[0017]
The diaphragm 11 radiates vibration converted into mechanical vibration from the electrical
input signal input to the voice coil 12 as sound according to the input signal, and pulp, resin or
the like is used as the material. The central portion of the diaphragm 11 is bonded and fixed to
one end of the cylinder of the voice coil bobbin 13, the edge 17 is bonded to the opening of the
diaphragm 11, and the outer peripheral portion of the edge 17 is bonded and fixed to the frame
15. Further, in the voice coil bobbin 13 to which the diaphragm 11 is fixed, the outer periphery
of the voice coil bobbin 13 is bonded to the inner peripheral portion of the damper 16 and the
outer peripheral portion of the damper 16 is bonded to the frame 15. Is suspended and
connected by the edge 17 and the damper 16.
[0018]
The voice coil bobbin 13 is formed in a cylindrical shape using a light member such as paper,
resin, or aluminum. A thin wire, such as insulated copper or aluminum, is wound around the
outer periphery of the cylinder to form a voice coil 14. The damper 16 supports the diaphragm
11 so that the diaphragm 11 moves following the vibration of the voice coil bobbin 13. Resin,
mixed spinning, or the like is used as the material.
[0019]
The frame 15 is a member for holding the magnetic circuit portion and the vibration portion, and
the vibration portion is adhered to the inside of the frame 15 and the magnetic circuit portion is
adhered and fixed to the rear (right side in the drawing). As a material, a rolled steel plate, an
aluminum die cast, a resin material or the like is used. The magnetic circuit portion is composed
of a ring-shaped permanent magnet 25 (hereinafter referred to as the magnet 25), the bottom
yoke 20, the top plate 23 and the like, and the magnetic circuit portion adheres and fixes the
bottom yoke 20 and the top plate 23 to both end surfaces of the magnet 25. However, at this
time, the center pole 21 of the bottom yoke 20 is assembled to be at the center of the inner
diameter of the magnet 25.
[0020]
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In the bottom yoke 20, a flange portion 22 is formed on the end faces of the cylindrical center
pole 21 and the center pole 21, and the intake and exhaust holes 24 are penetrated in the axial
direction of the bottom yoke 20. A carbon steel material of a magnetic substance or the like is
used as the material of the bottom yoke 20, and after being formed by turning or the like, plating
for rust prevention is applied. The top plate 23 has a washer-like shape, and a rolled steel plate
or the like of a magnetic material is used as the material, and after being formed by press
working or the like, plating for rust prevention is applied.
[0021]
The details of this embodiment will be described with reference to the drawings. In the following
embodiments, the shape of the through hole 24 of the bottom yoke 20 of FIG. 1 and the
waterproof and dustproof members are inserted into the through hole 24 and the other parts are
substantially the same as the configuration of FIG. Therefore, the same components as those
shown in FIG. The first embodiment will be described with reference to FIG.
[0022]
FIG. 2 is a cross-sectional view showing the structure of the loudspeaker according to the first
embodiment of the present invention. A bottom yoke 30 has a flange 32 formed on the end faces
of the column-shaped center pole 31 and the center pole 31. A small diameter hole 34 and a
stepped intake and exhaust hole 33 of the large diameter hole 36 are penetrated at the center of
the bottom yoke 30. ing. A magnetic carbon steel material or the like is used as the material of
the bottom yoke 30, and after being formed by turning, etc., plating for rust prevention is
applied.
[0023]
Next, the operation will be described. During rain or car wash, the water droplets 6 penetrate the
inside of the vehicle door through the window glass 5 or the like. Then, the invading water
droplets 6 fall on the rear end portion of the bottom yoke 30 of the speaker 1 mounted inside the
door of the vehicle, and the falling water droplets 6 travel along the rear end surface 35 and
enter the inlet of the large diameter hole 36 of the intake and exhaust holes 33. Reach. On the
other hand, the external air is sucked into the inside of the speaker 1 through the intake and
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exhaust holes 33 or the air inside the speaker 1 is exhausted to the outside by the amplitude
operation of the diaphragm 11 of the speaker 1 in the front-rear direction. A part of the water
droplet 6 which has reached near the inlet of the large diameter hole 36 of the air suction and
discharge hole 33 along with the suction action is sucked into the large diameter hole 36. Then,
when a part of the water droplet 6 sucked into the large diameter hole 36 penetrates to the
stepped portion with the small diameter hole 34, the vertical surface 37 of the stepped portion
prevents the water droplet 6 from entering the inside of the speaker 1 .
[0024]
As described above, according to the present embodiment, the intake and exhaust holes 33
penetrated by the bottom yoke 30 are the stepped holes of the small diameter hole 34 and the
large diameter hole 36. Even if the water droplets 6 fall down and travel through the rear end
surface 35 of the bottom yoke 30 and a part of the water droplets 6 enter the inside of the large
diameter holes 36 of the intake and exhaust holes 33, the vertical of the stepped portion of the
small diameter holes 34 and the large diameter holes 36 The surface 37 prevents the water
droplet 6 from intruding into the interior of the speaker 1. Therefore, the initial quality of the
speaker 1 can be maintained.
[0025]
Next, a second embodiment will be described with reference to FIG. FIG. 3 is a view showing a
structure of a speaker according to a second embodiment of the present invention, in which (a) is
a cross-sectional view of the speaker and (b) is a perspective view of a waterproof cover. A
waterproof cover 40 has a semi-cylindrical shape whose outer diameter is engaged with the large
diameter hole 36 of the intake and exhaust hole 33 of the bottom yoke 30. A resin material is
used as the material of the waterproof cover 40 and is formed by resin molding processing. The
waterproof cover 40 inserts the opening 41 downward (downward in the drawing) into the large
diameter hole 36 of the intake and exhaust hole 33 of the bottom yoke 30, and the end of the
waterproof cover 40 protrudes rearward from the end surface 35 of the bottom yoke 30. It is
fixed by an adhesive or the like as
[0026]
Next, the operation will be described. During rain or car wash, the water droplets 6 penetrate the
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inside of the vehicle door through the window glass 5 or the like. Then, the intruded water
droplet 6 falls on the rear end portion of the bottom yoke 30 of the speaker 1 mounted inside the
door of the vehicle, and the water droplet 6 travels along the rear end surface 45 and reaches the
inlet of the intake and exhaust hole 43. Then, it flows down along the outer periphery of the
protrusion of the waterproof cover 40.
[0027]
As described above, according to the present embodiment, the water droplet 6 falls from the
upper part near the rear end surface of the speaker 1 and the water droplet 6 transmitted along
the rear end surface 35 of the bottom yoke 30 protrudes from the rear end surface 35 of the
bottom yoke 30 Since it is blocked by the waterproof cover 40, it can be prevented from passing
along the large diameter hole 36 of the bottom yoke 30 and entering the inside of the speaker 1.
Therefore, the initial quality of the speaker 1 can be maintained.
[0028]
In the present embodiment, the waterproof cover 40 is a semi-cylindrical shape in which the
cylinder is divided in half in the longitudinal direction, but not limited thereto, a cylindrical body
having cross sections of various shapes is divided in the longitudinal direction (correctly in half
Even if it does not have, it is sufficient if it is a semi-cylindrical shape as long as it has at least a
waterproof effect. Next, a third embodiment will be described with reference to FIG.
[0029]
FIG. 4 is a view showing the structure of a loudspeaker according to a third embodiment of the
present invention, wherein (a) is a sectional view of the loudspeaker and (b) is a perspective view
of a net-like cover. Reference numeral 50 denotes a net-like cover, which has an outer diameter
in the form of a disk engaged with the large diameter hole 36 of the air intake and exhaust hole
33 of the bottom yoke 30, and a net portion 51 is formed at the center of the disk. A resin
material is used as the material of the net-like cover 50 and is formed by resin molding
processing. The net-like cover 50 is fixed to the vertical surface 37 of the step between the small
diameter hole 34 and the large diameter hole 36 of the air suction and discharge hole 33 of the
bottom yoke 30 with an adhesive or the like.
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[0030]
Next, the operation will be described. During rain or car wash, the water droplets 6 penetrate the
inside of the vehicle door through the window glass 5 or the like. Then, the invading water
droplet 6 falls on the rear end portion of the bottom yoke 30 of the speaker 1 mounted inside the
door of the vehicle, and the water droplet 6 travels along the rear end surface 35 and reaches
near the entrance of the large diameter hole 36. On the other hand, by the amplitude operation
of the diaphragm 11 of the speaker 1 in the front-rear direction, outside air is sucked into the
inside of the speaker 1 through the intake and exhaust holes 53 or the air inside the speaker 1 is
exhausted outside. A part of the water droplet 6 that has reached near the inlet of the large
diameter hole 36 along with the suction action is drawn into the large diameter hole 36 and
reaches the net-like cover 50 provided inside the air suction and discharge hole 33. Then, the
water droplet 6 reaching the net-like cover 50 is blocked by the net portion 51 and prevented
from intruding into the main part inside the speaker 1.
[0031]
As described above, according to the present embodiment, the net-like cover 50 is provided at
the step between the small diameter holes 34 and the large diameter holes 36 of the air intake
and exhaust holes 33 penetrated by the bottom yoke 30. Even if the water droplet 6 falls from
the upper part and a part of the water droplet 6 intrudes into the large diameter hole 36, the netlike cover 50 can prevent the water droplet 6 from invading into the main part inside the speaker
1. Besides the water droplets 6, the net-like cover 50 also has a dustproof effect. Therefore, the
initial quality of the speaker 1 can be maintained.
[0032]
A fourth embodiment will now be described with reference to FIG. FIG. 5 is a view showing the
structure of a loudspeaker according to a fourth embodiment of the present invention, wherein
(a) is a sectional view of the loudspeaker and (b) is a perspective view of a waterproof and
dustproof cover. A waterproof and dustproof cover 60 has a disc shape on one end face of a
semi-cylindrical waterproof cover portion 61 whose outer diameter is engaged with the large
diameter hole 36 of the intake and exhaust hole 33 of the bottom yoke 30 A net-like cover
portion 62 in which a net portion 63 is formed in the portion is integrally formed with the
waterproof cover portion 61. A resin material is used as a material of the waterproof and
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dustproof cover 60 and is formed by resin molding processing. The waterproof and dustproof
cover 60 has the opening 64 of the waterproof cover 61 inserted downward into the large
diameter hole 36 of the intake and exhaust hole 33 of the bottom yoke 30 (the lower side in the
drawing), and the other end of the waterproof cover 61 is a bottom yoke It is fixed by an
adhesive or the like so as to protrude rearward from the end face 35 of 30.
[0033]
Next, the operation will be described. During rain or car wash, the water droplets 6 penetrate the
inside of the vehicle door through the window glass 5 or the like. Then, the invading water
droplet 6 falls on the rear end portion of the bottom yoke 30 of the speaker 1 mounted inside the
door of the vehicle, and the water droplet 6 travels along the rear end surface 35 and reaches
near the entrance of the large diameter hole 36. Then, it flows down along the outer periphery of
the protruding portion of the waterproof cover 61. If a part of the water droplet 6 is sucked into
the large diameter hole 36 and penetrates into the inside of the speaker 1 and reaches the netlike cover portion 62 provided inside the air suction and discharge hole 33, the net portion 63 is
essential to the inside of the speaker 1 Prevent entry into the department.
[0034]
As described above, according to the present embodiment, the water droplet 6 falls from the
upper part near the rear end surface of the speaker 1 and the water droplet 6 transmitted along
the rear end surface 35 of the bottom yoke 30 protrudes from the rear end surface 35 of the
bottom yoke 30 Since it is blocked by the waterproof cover portion 61, it can be prevented from
entering the speaker 1 along the large diameter hole 36. Even if part of the water droplet 6
intrudes into the large diameter hole 36, the net-like cover 50 can prevent the water droplet 6
from invading into the main part inside the speaker 1. Besides the water droplets 6, the net-like
cover 50 also has a dustproof effect. Therefore, the initial quality of the speaker 1 can be
maintained.
[0035]
As described above, according to the speaker of the present invention, even if water droplets or
dust that has traveled through a window glass or the like when it rains or is washed into the door
of a vehicle falls on the top of the speaker, the speaker The shape of the intake and exhaust holes
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penetrated by the bottom yoke and the waterproof and dustproof cover provided in the intake
and exhaust holes can prevent the water droplets and dust from traveling along the intake and
exhaust holes into the inside of the speaker. Therefore, the occurrence of problems due to water
droplets or dust of the voice coil bobbin or the like is eliminated, and the initial quality of the
speaker can be maintained.
[0036]
Brief description of the drawings
[0037]
1 is a cross-sectional view showing the configuration of the basic structure of the in-vehicle
speaker of the present invention.
[0038]
2 is a cross-sectional view showing the structure of the speaker of the first embodiment of the
present invention.
[0039]
3 is a view showing the structure of the speaker of the second embodiment of the present
invention, (a) is a cross-sectional view of the speaker, (b) is a perspective view of the waterproof
cover.
[0040]
4 is a diagram showing the structure of the speaker of the third embodiment of the present
invention, (a) is a cross-sectional view of the speaker, (b) is a perspective view of the net-like
cover.
[0041]
5 is a diagram showing the structure of the speaker of the fourth embodiment of the present
invention, (a) is a cross-sectional view of the speaker, (b) is a perspective view of the waterproof
dustproof cover.
[0042]
6 is a cross-sectional view showing the structure of a conventional speaker.
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[0043]
Explanation of sign
[0044]
1 ...... speaker 5 ...... windowpane 6 ...... water droplets 7 ......... door trim 8 ...... vehicle outer panel
11 ..... oscillating Plate 12: Voice coil 15: Frame 16: Damper 20, 30: Bottom yoke 21, 31: Center
pole 22, 32: Back plate 23: Top plate 24, 33 · · Air intake and exhaust hole 25 · · · Magnet 34 · · ·
Small diameter hole 36 · · · Large diameter hole 40 · · · Waterproof cover 41 · · · · Opening portion
50 · · · .... Net-like cover 51, 63 ··· Net part 60 ··· Water-proof dustproof cover 61 ··· Waterproof
cover part 62 ··· Net-like cover part
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