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JPH10108296

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DESCRIPTION JPH10108296
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electromagnetic acoustic transducer and a winding method of a coil, and the electromagnetic
acoustic transducer having a very low profile and the electromagnetic acoustic transducer having
a low profile. The present invention relates to a method of winding a coil which can obtain stable
characteristics.
[0002]
2. Description of the Related Art As shown in the cross-sectional view of FIG. 4, an
electromagnetic acoustic transducer is provided in a container body 40 comprising a cylindrical
container 41 with a bottom and a lid 42 having a sound emission hole. The coil 44 disposed on
the coil bobbin 43 from the lower side, the ring-shaped magnet 45, and the diaphragm 46 are
disposed.
[0003]
In the electromagnetic acoustic transducer, when an electric signal corresponding to an audio
signal is input to the coil 44 to the lead terminals 49 and 50 connected to both ends of the coil
wire, a magnetic flux corresponding to the audio signal is generated from the coil 44.
The magnetic flux and the magnetic flux of the magnet 45 are combined, and the diaphragm 46
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generates a predetermined vibration, and the vibration of air is emitted as sound through the
sound emission hole 47 of the lid 42 to the outside.
[0004]
Since such an electromagnetic acoustic transducer is used, for example, in a portable telephone
device or a handset, a reduction in height is strongly required. For example, it is required that the
thickness of the appearance be 2 mm or less.
[0005]
In general, a coil bobbin 43 for winding a coil wire is used for the coil 4, and the coil wire is
wound around the coil bobbin 43 in a process separate from the assembly process of the
electromagnetic acoustic transducer. In the assembly process, the coil wire is disposed in the
container 40, and both ends of the coil wire are drawn out from the outside of the container 40
through the lead terminals 49 and 50.
[0006]
The coil bobbin 43 has a cross-sectional shape of an E-shaped cross section consisting of upper
and lower pressure plates 43a and 43b and a center pole 43c connecting both pressure plates
43a and 43b. It is configured by winding a wire.
[0007]
In order to wind the coil wire around the center pole 42 of the coil bobbin 43 to function as the
coil 44, it is necessary to wind the coil wire around the center pole 42 for about 300 turns, and
after the winding is completed, It is necessary to fix the wound coil wire.
For this reason, the coil wire uses a resin-coated one that can be heat-melted around the core
material, and after applying and winding a predetermined tension, fuses the resins of the coil
wire wound by heat treatment. It was
[0008]
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Considering the overall thickness of the electromagnetic acoustic transducer, the thickness of the
bottom of the container 41, the thickness of the coil 44, ie, substantially the thickness of the coil
bobbin 43, the thickness of the diaphragm 46, and the amplitude of the diaphragm 46 are
considered. The vibration space is the sum of the thickness of the lid 42.
The magnet 45 is disposed so as to substantially surround the coil bobbin 43, and can be
substantially ignored because it is lower than the coil bobbin 43.
[0009]
SUMMARY OF THE INVENTION In the electromagnetic acoustic device having the abovementioned structure, the structure of the coil bobbin 43 becomes a major obstacle in
consideration of each component and the space in consideration of the reduction in thickness of
the device. It is. That is, the coil bobbin 43 has upper and lower restraining plates 43a and 43b,
and each thickness is required to have sufficient strength for tension when winding the coil wire,
so the thickness is at least 0.3 mm. It had some thickness. Temporarily, the thickness of the
whole coil bobbin 43 becomes up to 1.3 mm only by setting the space of the winding space of
the coil wire material to about 0.7 mm, and other structural members can be accommodated
within 0.7 mm. It is impossible.
[0010]
The present invention has been made in view of the above-mentioned problems, and an object
thereof is to provide a low-profile electromagnetic acoustic device by improving the shape of a
coil bobbin. Further, at the same time, even if the structure of the coil bobbin is changed, a
method of winding the coil is provided which does not disturb the vibration operation of the
diaphragm.
[0011]
SUMMARY OF THE INVENTION The first invention relates to a low-profile electromagnetic
acoustic device, in which a coil, a magnet and a diaphragm are disposed in a container, and a lid
having a sound emission hole is provided. In the electromagnetic type acoustic transducer
formed by covering, the container is constructed by arranging an insulating resin frame around a
magnetic metal flat plate having a protrusion serving as a center pole at the center, and the
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protrusion A coil formed by winding a coil wire material is formed, which is an electromagnetic
acoustic transducer.
[0012]
A second aspect of the invention is a method of winding a coil of an electromagnetic acoustic
transducer, comprising preparing a coil wire coated with a melt-bondable insulating material and
a flat holding jig made of an elastic member, The flat holding jig is pressed against the
projections of the magnetic metal flat plate, and a coil wire rod having a distance h smaller than
the height H of the projections between the magnetic metal flat plate and the flat holding jig. A
step of forming a winding space, a step of winding a coil wire in the winding space, a step of
removing the holding jig, and heating the wound coil wire to melt and bond the insulating
material. And a step of fixing the coil wires together, and a method of winding a coil of an
electromagnetic acoustic transducer.
[0013]
According to the first aspect of the invention, the conventional coil bobbin is integrated with a
part of the container functioning as the yoke plate, and the pressing plate on the upper surface
side forming the winding space of the coil wire is eliminated. is there.
[0014]
That is, the coil wire is directly wound around the protrusion using a magnetic metal flat plate in
which a protrusion serving as a center pole is erected at the center.
For this reason, a coil bobbin becomes substantially unnecessary.
[0015]
As a result, the molding method can be simplified, the number of parts can be reduced, and
structurally, the magnetic metal flat plate and the insulating resin frame can be formed into a
concaved container body capable of housing other constituent members. .
[0016]
After all, compared to the conventional case, by integrally forming the coil bobbin and the
container, the thickness required for the upper and lower pressing plates of the conventional coil
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bobbin can be reduced, and the electromagnetic acoustic transducer having a very low profile
can be reduced. It becomes.
[0017]
In addition, since the number of parts can be reduced and the container structure is simplified, it
becomes an electromagnetic acoustic transducer having a very low profile.
[0018]
The second invention is a method of winding a coil wire around a protrusion having a T-shaped
cross section in which the shape of the magnetic metal flat plate functioning as a coil bobbin is
unique as described above.
[0019]
In the present invention, as a substitute for the upper pressure plate, which is a part of the
conventional coil bobbin, a flat pressure jig of which at least the surface is an elastic member is
used.
The flat restraining jig is pressed against the tip of the projection, and the coil wire is wound in a
space formed between the flat restraining jig and the magnetic metal flat plate.
At this time, the tip of the projection is press-fit into the elastic member of the flat holding jig in a
pressed state, and as a result, the space h between the space formed between the holding jig and
the magnetic metal flat plate is It becomes a state narrower than height H of a projection part.
[0020]
This is because while applying a certain amount of tension when winding the coil wire around
the projection, internal stress is accumulated in the wound coil wire, and the final shape of the
coil is the outer periphery It takes into consideration that it will rise up and become mortar-like
as a whole.
[0021]
That is, even if the coil formed so that the tip of the projection projects, the coil wire is wound so
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as to lower the height of the coil in advance, even if a rise occurs on the outer periphery, so
vibration is caused. There is no collision with the coil during operation of the plate.
[0022]
Therefore, as in the first aspect of the invention, in the electromagnetic type acoustic device in
which the reduction in height is achieved, the coil wire can be stably wound, and stable
characteristics can be obtained without the occurrence of collision between the diaphragm and
the coil. It becomes the winding method of the coil of the electromagnetic type acoustic device
which can be derived.
[0023]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The electromagnetic sound
transducer according to the present invention will be described in detail with reference to the
drawings.
[0024]
FIG. 1 is a cross-sectional view of an electromagnetic acoustic transducer.
FIG. 2 is a plan view around the magnetic metal flat plate of the electromagnetic acoustic
transducer.
[0025]
In the figure, 1 is a magnetic metal flat plate, 2 is an insulating resin frame, 3 and 3 lead
terminals, 4 is a ring-shaped magnet, 5 is a coil, 6 is a diaphragm, and 7 is a lid.
[0026]
The magnetic metal flat plate 1 is made of a magnetic metal material such as iron plated with Ni
or the like, and has a substantially disk shape as a whole as shown in FIG.
Further, on the upper surface of the magnetic metal plate 1, a projection 11 to be a center pole is
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formed by known metal processing.
[0027]
In addition, an insulating resin frame 2 made of epoxy resin, ABS plastic or the like is
circumferentially provided on the outer periphery of the magnetic metal flat plate 1 to a
predetermined thickness.
In the frame 2, a part of the lead terminals 3 is embedded so as to protrude to the outside.
The magnetic metal flat plate 1, the lead terminals 3, 3 formed of the same member as the
magnetic metal flat plate 1, and the insulating frame 2 are integrally molded by a resin insert.
[0028]
Moreover, between the lead terminals 3 and 3 of the insulating resin frame 2, a groove 21
through which the coil wire from the coil 5 formed inside can pass is formed.
[0029]
The ring-shaped magnet 4 is formed, for example, by mixing a rubber component and a magnetic
steel component such as Fe-Al-Ni-Co-based or Cu-Ni-Fe-based, and molding and solidifying it into
a ring shape.
[0030]
The coil 5 is formed of a coil wire 51 which is wound around the protrusion 11 with a
predetermined number of turns and in which adjacent coil wires are fixed by heat fusion or the
like.
The coil wire 51 is covered with an insulating material made of, for example, a urethane-based
thermoplastic resin that can be softened and welded by heat treatment around the core material,
and has a diameter of about 34 μm as a whole.
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[0031]
The surface of the coil 5 wound around the protrusion 11 has a mortar shape, and at least the tip
of the protrusion 11 protrudes from the surface of the coil 5.
Here, it is important to set the outer peripheral portion of the mortar-shaped coil 5 so as not to
project at least beyond the tip of the projection 11.
[0032]
The diaphragm 6 is made of, for example, a sheet of resin such as PEI having a thickness of 25
μm, and an armature 61 made of, for example, 42Ni-Fe alloy is laminated and bonded to a single
plate at the central portion.
Although the diaphragm 6 is flat in the figure, it may be in the form of a dish having a central
portion recessed.
[0033]
The lid 7 is made of ABS plastic or the like and has a bottomed cylindrical shape with a diameter
of 20 to 25 mm as a whole, and a sound output hole 71 is formed on the surface thereof. In such
a manner as to completely cover the insulating resin frame 2 provided in the circumferential
direction.
[0034]
In assembly, the magnetic metal flat plate 1 having the insulating resin frame 2 in which a part of
the lead terminals 3 is embedded by resin molding, the diaphragm 6 to which the ring-shaped
magnet 4 and the AMACEA 61 are attached, and the lid A coil wire 51 serving as the coil 7 and
the coil 5 and an upper surface holding jig 12 for forming a winding space of the coil wire are
prepared.
[0035]
First, the coil wire 51 is wound around the protrusion 11 at the center of the magnetic metal
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plate 1 by a predetermined number of turns.
[0036]
Specifically, as shown in FIG. 2, the upper surface pressing jig 12 is pressed and arranged so as
to form a winding space of the coil wire 51 around the protrusion 11 at the tip of the protrusion
11.
At least the elastic body 13 such as a rubber-like elastic plate is disposed on the surface of the
upper surface holding jig 12.
The entire jig 12 may be formed of an elastic body.
[0037]
The upper surface holding jig 12 is disposed so that the surface thereof is maintained parallel to
the magnetic metal flat plate 1 and that a part of the tip of the protrusion 11 is pressed into the
elastic body 13.
Thus, assuming that the height of the protrusion 11 is H, and the distance between the magnetic
metal flat plate 1 and the upper surface holding jig 12 (the distance between the winding spaces)
is h, the relationship of H> h is satisfied.
The amount Δh (H−h) to be pressed into the elastic body 13 is preferably 50 μm or more.
[0038]
Next, a predetermined turn is wound while applying a predetermined tension to the coil wire 51
extended from the needle 14 of the winding device at the projection 11 of the winding space.
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The core at one end of the coil wire 51 is wound around and connected to one of the lead
terminals 3, extends from the lead terminal 3 toward the projection 11, and is wound around the
projection 11.
After the winding process of the coil wire 51 is accommodated, the other end of the wound coil
wire 51 is wound around the other lead terminal 3.
[0039]
Here, since the surface of the upper surface pressing jig 12 of the coil wire 51 is made of the
elastic body 13, the protrusion 11 and the upper surface pressing jig 12 are in close contact with
each other, and the coil wire 51 is excessive. Since no stress is applied, disconnection of the coil
wire 51 during winding can be effectively prevented.
[0040]
Next, the upper surface pressing plate 12 is removed, heat is applied to the extent that the
insulating material of the coil wire 51 can be melted by a heating means such as an oven, and the
coiled wire 51 in a wound state is fixed by fusion.
[0041]
Thus, the coil 5 in which the coil wire 51 is wound around the projection 11 by a predetermined
number of turns is achieved.
[0042]
Although the coil 5 formed as described above is formed in a cylindrical shape around the
protrusion 11, in fact, the surface of the coil 5 is gradually lifted up toward the outer periphery,
It will be shaped like a mortar.
[0043]
The coil wire 51 is wound while applying a predetermined tension for tight winding when
winding the coil wire 51, and as a result, it is spread outward from the winding center
(protrusion 11) side The power to try is working.
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However, since it is difficult to physically spread out, as a result, the upper surface side which is a
relatively free surface of the coil 5 is warped.
[0044]
When the coil wire 51 having a diameter of about 34 μm is wound about 300 turns, the amount
of displacement between the central part and the outer peripheral part of the coil 5 is about 50
μm.
[0045]
Therefore, since the upper surface holding jig 12 sinks 50 μm or more from the tip of the
projection 11 (Δh = 50 μm or more), the top position of the coil 5 is the top even if the final
surface of the coil 5 becomes a mortar shape. It does not project beyond the end face of the
projection 11.
[0046]
Next, the ring-shaped magnet 4 which is not magnetized is arranged and fixed on the magnetic
metal flat plate 1 around the coil 5 through an adhesive.
[0047]
Next, the diaphragm 6 is fixed to the insulating frame 2 circumferentially provided around the
magnetic metal flat plate 1 via an adhesive.
[0048]
Next, the cover 7 is disposed so as to be fitted to the insulating frame 2 circumferentially
provided around the magnetic metal flat plate 1 via an adhesive.
Thus, the appearance of the electromagnetic acoustic transducer is completed.
[0049]
Finally, the above-described assembled electromagnetic type acoustic transducer is inserted into
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the magnetizing device, and a strong magnetic field is applied to the ring magnet 4 which is not
magnetized to magnetize it.
As a result, a functionally complete electromagnetic acoustic transducer is completed.
[0050]
In the electromagnetic acoustic transducer according to the first aspect of the present invention,
the thickness of the entire device is the sum of the thickness of the bottom of the magnetic metal
flat plate 1, the thickness of the insulating resin frame 2, and the thickness of the top of the lid 7.
The thickness of the insulating resin frame 2 is the height (for example, 800 μm) of the
projection 11 to be the coil 5, the vibration space on the back side from the projection 11 to the
diaphragm 6 (for example 150 μm), armature 61 The thickness of the diaphragm 6 (for
example, 300 .mu.m) including the above, and the thickness of the front-side vibration space (for
example, about 150 .mu.m) from the sub-diaphragm 6 to the lid 7 are for example about
[0051]
Therefore, as a whole, the thickness of the bottom of the magnetic metal flat plate 1, eg 0.3 mm,
the thickness of the insulating resin frame 2, eg 1.4 mm, the thickness of the upper surface of the
lid 7, eg 0.3 mm, total 2 mm It becomes.
[0052]
Here, when the conventional coil bobbin is used alone, in addition to the thickness of the bottom
surface of the container, for example, 0.3 mm, the thickness of the lower surface flat plate of the
coil bobbin and the thickness of the upper surface flat plate are each 0.3 mm (total However, as
described above, according to the present invention, the magnetic metal flat plate 1 which is a
part of the container also functions as a coil bobbin, and the upper flat plate is eliminated. The
total thickness of 0.6 mm, which is the thickness of the upper and lower plates, can be
eliminated, and the overall height of the device can be reduced.
[0053]
In the coil winding method of the second invention, particularly as in the first invention, the
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projection of the magnetic metal flat plate 1 substantially excluding the upper surface flat plate
of the coil bobbin and substantially serving as a part of the container 11 is a method for winding
the coil wire 51, and since the center surface of the coil 5 is formed by sinking from the tip of the
projection 11, even if the surface of the coil 5 becomes a mortar shape. Even when the
diaphragm 6 vibrates with a large amplitude (amplitude of 50 to 60 μm), the diaphragm 6 and
the outer peripheral portion of the coil 5 do not collide at all.
[0054]
Therefore, stable vibration operation of the diaphragm 6 can be ensured, and stable
characteristics can be derived.
[0055]
As described above, according to the first aspect of the present invention, the function of the coil
bobbin for winding the coil wire can be doubled as the magnetic metal flat plate, and the upper
flat plate of the conventional coil bobbin can be eliminated. It is very easy to reduce the overall
height, and the requirement for the reduction in height can be sufficiently satisfied.
[0056]
According to the second aspect of the invention, even if the coil wire is formed by winding the
coil wire around the protrusion of the magnetic metal flat plate, the outer periphery of the coil
does not protrude at least from the tip of the protrusion. In the coil winding method, the collision
between the coil and the coil can be completely eliminated, and stable vibration of the diaphragm
can be guaranteed.
[0057]
Brief description of the drawings
[0058]
1 is a cross-sectional view of the electromagnetic acoustic transducer of the present invention.
[0059]
2 is a diagram for explaining the magnetic substrate flat plate portion of the electromagnetic
acoustic transducer of the present invention, (a) shows a cross-sectional view, (b) shows a plan
view.
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[0060]
3 is a schematic view illustrating a coil winding method used for the electromagnetic acoustic
transducer of the present invention.
[0061]
4 is a cross-sectional structural view of a conventional electromagnetic acoustic transducer.
[0062]
Explanation of sign
[0063]
DESCRIPTION OF SYMBOLS 1 ... Magnetic metal flat plate 2 ... Insulating frame 3 ... Lead terminal
4 ... Coil 5 ... Magnet 6 ... Diaphragm 7 ... Lid
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