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JP2006101376

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DESCRIPTION JP2006101376
PROBLEM TO BE SOLVED: To provide an acoustic electromagnetic conversion device in which a
coil is accurately positioned with respect to a yoke or the like to improve performance, as well as
to easily insulate and lock a lead wire to reduce a manufacturing cost. SOLUTION: A
magnetostrictive element 28 is built in a central portion of a bobbin 30 in a form in which a coil
26 is wound. The bobbin 30 and the yoke 36 are disposed in the case main body 12 and the case
lid portion 14 so that the yoke 36 formed of a metal material is positioned adjacent to one end of
the bobbin 30. Two guides 31, 32 having a dimension L2 longer than a dimension L1 obtained
by adding the thicknesses of the yoke 36 and the case lid 14 are integrally formed with the
bobbin 30. Guides 31 and 32 pass through the yoke 36 and the case cover 14 while the guide
parts 31 and 32 engage with the holes 36A and 14A provided in the yoke 36 and the case cover
14, respectively, and the lead wires 26A and 26B of the coil 26 It is guided by the guide portions
31 and 32 and pulled out of the case lid portion 14. [Selected figure] Figure 1
Electromagnetic converter for sound
[0001]
The present invention not only aims to reduce the manufacturing cost by easily insulating and
locking the lead wire which becomes the end of the coil, but also to position the coil accurately
with respect to the yoke etc. to enhance the performance of the acoustic electromagnetic wave
The conversion device is particularly suitable for an acoustic electromagnetic conversion device
using a magnetostrictive element.
[0002]
An acoustic electromagnetic conversion device that generates sound by vibrating a diaphragm by
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1
expansion and contraction of a magnetostrictive element is conventionally known, but in the
conventional acoustic electromagnetic conversion device, for example, a magnetostrictive
element is inserted in a bobbin around which a wire is wound. In addition to the above, a yoke
made of a magnetic material is disposed adjacent to the bobbin, and a bias magnet is disposed
around the magnetostrictive element.
[0003]
Further, when a current is applied to the coil of this acoustic electromagnetic conversion device,
a magnetic field is generated in the coil corresponding to this current, and the amount of
magnetostriction of the magnetostrictive element changes accordingly, and the magnetostrictive
element expands and contracts. Become.
As a result, the expansion and contraction of the magnetostrictive element is transmitted to the
external diaphragm to vibrate the external diaphragm.
[0004]
In the conventional electromagnetic transducer for sound, as shown in FIG. 6, in order to insulate
and lock the lead wires 114A and 114B of the coil 114 wound around the bobbin 112, a
protective material 116 such as an insulating tube or tape is used. An insulating tube etc. were
used in the form attached to the circumference | surroundings of these lead wires 114A, 114B.
[0005]
On the other hand, although the following patent documents are known as related documents,
patent document 1 grade | etc., Provided the notch in the collar part of a bobbin, and the
structure which wired the leader which is the end of a coil to this notch is It was only disclosed.
Furthermore, Patent Document 4 merely disclosed a structure in which the substrate attachment
portion is formed by extending the yoke.
Patent Document 1: Japanese Patent Application Laid-Open No. 2002-80172 Japanese Utility
Model Application Publication No. 7-36409 Patent Document 2: Japanese Patent Application
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2
Laid-Open No. 2003-297626 Patent Document 2 Japanese Patent Publication No. 6-87442
[0006]
However, the amount of expansion and contraction of the magnetostrictive element changes
significantly depending on the positional relationship among the coil, the bias magnet and the
yoke, the shape of the yoke, and the like. For this reason, it is preferable to make the shape of the
coil, the bias magnet and the yoke into an axially symmetrical shape, and further, by arranging
the members coaxially, the expansion and contraction amount of the magnetostrictive element is
stabilized and the performance is enhanced. However, it has been difficult to accurately position
and coaxially arrange in the conventional acoustic electromagnetic transducer.
[0007]
On the other hand, in order to solve the problem caused by the contact of the lead wire of the
coil with the metal member such as the yoke, since the lead wire is insulated and locked using an
insulating tube or tape, the assembly is conventionally performed. And it is difficult to reduce the
manufacturing cost. In view of the above facts, the present invention not only aims to reduce the
manufacturing cost by simply insulating and locking the lead wire which is the end of the coil but
also accurately positioning the coil with respect to the yoke etc. An object of the present
invention is to provide an acoustic electromagnetic conversion device that can be enhanced.
[0008]
The acoustic electromagnetic conversion device according to claim 1 is disposed in contact with
one end of the bobbin, a coil for generating a magnetic field, a bobbin in which a wire forming
the coil is wound, a magnetostrictive element disposed at the center of the bobbin, and An
acoustic electromagnetic conversion device comprising: a yoke, a case body and a case cover for
internally holding these members, and a terminal plate fitted to the case cover and having a
terminal electrode, A guide portion longer than the sum of the thicknesses of the yoke and the
case lid is provided at the flange forming the one end side of the coil, and the guide is fitted while
penetrating the yoke and the case lid while the coil is drawn out. It is characterized in that the
wire is guided by the guide portion, drawn out from the case lid portion and guided to the
terminal plate.
[0009]
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3
The operation of the acoustic electromagnetic transducer according to claim 1 will be described
below.
According to the acoustic electromagnetic conversion device of the present invention, the wire
forming the coil for generating the magnetic field is wound on a bobbin, the magnetostrictive
element is disposed at the center of the bobbin, and the one end side of the bobbin is in contact
The yoke is arranged. Then, the case main body and the case cover unit hold and hold these
members, and a terminal plate having terminal electrodes is fitted to the case cover unit.
[0010]
Further, a guide portion longer than the dimension obtained by adding the thicknesses of the
yoke and the case lid is provided in the flange forming the one end side of the bobbin, and the
yoke and the case lid are penetrated while fitting the guide According to the above structure, the
lead wire of the coil is guided by the guide portion, drawn out of the case lid, and guided to the
terminal plate.
[0011]
That is, a guide portion is formed on one end side of the bobbin that is to face the yoke, and the
lead wire of the coil is disposed along the guide portion, so that the conductive metal material
such as the yoke and the case lid portion It has become possible to simply and reliably isolate
and insulate the wire from the wire and to lock the lead wire, and it becomes unnecessary to use
the insulating tube or tape which has been used conventionally.
[0012]
Furthermore, the structure in which the guide portion formed on the bobbin and the yoke and
the case lid are fitted as described above enables accurate positioning of the coil in which the
wire is wound around the bobbin with respect to the yoke and the case lid. It became possible.
As a result, the coil can be installed so that the center of the coil is accurately positioned at the
center of the facing surface of the yoke, and when current is applied to the coil, the magnetic
field generated by the coil is applied uniformly and stably to the magnetostrictive element. The
expansion and contraction amount of the magnetostrictive element is stabilized.
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[0013]
From the above, according to the acoustic electromagnetic conversion device of the present
invention, the structure is simplified and the assemblability is improved and the manufacturing
cost is improved as the lead wire to be the end of the coil is simply insulated and locked. It is
possible to improve the performance by accurately positioning the coil with respect to the yoke
etc.
[0014]
The operation of the acoustic electromagnetic transducer according to claim 2 will be described
below.
According to this claim, in addition to the same constitution as in claim 1, the bobbin and the
guide portion are integrally formed of synthetic resin material.
Therefore, according to the present invention, the guide portion is integrally formed on the
bobbin by the synthetic resin material, so that not only the same function as in claim 1 is
achieved, but also the manufacturing cost at the time of manufacturing the guide portion While
being reduced, it becomes possible to arrange the guide portion more accurately with respect to
the bobbin.
[0015]
The operation of the acoustic electromagnetic transducer according to claim 3 will be described
below. According to this claim, in addition to the same constitution as in claims 1 and 2, there are
two guide portions, and the cross sectional shapes of these two guide portions are different from
each other.
[0016]
Therefore, according to the present invention, the cross-sectional shapes of the two guide
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5
portions are made different from each other, and the leader line on the winding start side is
arranged on one guide portion, and the leader line on the winding end side is arranged on the
other guide portion As a result, the leader line on the winding start side and the leader line on
the winding end side can be always arranged in a constant guide portion. As a result, not only the
same effect as in claim 1 but also the problem of the incorrect insertion of the lead wire of the
coil during assembly is solved.
[0017]
The operation of the acoustic electromagnetic transducer according to claim 4 will be described
below. According to this claim, in addition to the same constitution as in claim 1 and claim 2,
there are two guide portions, one guide portion is formed in a circular cross-sectional shape, and
the other cross-section of the guide portion It has a configuration in which the shape is formed in
a semicircular shape.
[0018]
Therefore, according to the present invention, not only the cross sectional shapes of the two
guide portions are made different from each other, but one of the cross sectional shapes is made
circular and the other cross sectional shape is made semicircular. By this, as in the third aspect,
the lead wire on the winding start side and the leader wire on the winding end side can be always
arranged in the constant guide portion, and the problem of the incorrect insertion of the coil lead
wire during assembly is solved. It became so.
[0019]
The operation of the acoustic electromagnetic transducer according to claim 5 will be described
below. According to this claim, in addition to the same configuration as in claim 3, the terminal
plate provided with the electrode terminal is fixed to the case lid portion, and two relief portions
having different shapes correspond to two guide portions respectively. It has a configuration in
which it is formed on the terminal board.
[0020]
Therefore, according to the present claim, for example, one relief portion of the terminal plate is
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6
formed in a shape conforming to the shape of one guide portion, and the other relief of the
terminal plate is formed in a shape conforming to the shape of the other guide portion. The
formation of the part prevents erroneous insertion of the terminal board into the case lid part at
the time of assembly, and the arrangement of the lead wire on the winding start side of the coil in
the terminal board and the arrangement of the lead wire on the winding end side , Always
constant.
[0021]
The operation of the acoustic electromagnetic transducer according to claim 6 will be described
below.
According to the present invention, in addition to the configuration similar to the fifth aspect, the
cross-sectional shape of one of the relief portions is formed in a circular shape, and the crosssectional shape of the other relief portion is formed in a semicircular shape. ing.
[0022]
Therefore, according to the present invention, for example, the cross-sectional shape of one guide
portion is made circular, the leader line on the winding start side is arranged, and the crosssectional shape of the other guide portion is semicircular, the leader line on the winding end side
Misalignment of the terminal plate with respect to the case lid during assembly by arranging and
forming the cross-sectional shape of one of the reliefs in a circular shape and forming the crosssectional shape of the other relief in a semicircular shape. Prevention has come to be achieved
more reliably.
[0023]
The operation of the acoustic electromagnetic transducer according to claim 7 will be described
below.
According to the present invention, in addition to the same configuration as in the first to sixth
aspects, the first engaging portion is formed in the case lid portion and the second engaging
portion is formed in the terminal plate, and these first The terminal plate is positioned relative to
the case lid by engagement between the engaging portion and the second engaging portion.
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[0024]
Therefore, according to the present invention, the engagement between the first engagement
portion and the second engagement portion ensures that the terminal plate is positioned relative
to the case lid portion, and the workability at the time of assembly is improved. It came to
improve.
[0025]
The operation of the acoustic electromagnetic transducer according to claim 8 will be described
below.
According to the present invention, in addition to the configurations similar to the third and
fourth aspects, two through portions are formed in the flange portion of the bobbin
corresponding to the two guide portions, and the shape of these two through portions is It has a
configuration of being mutually different.
[0026]
Therefore, according to the present claim, the two lead-out lines of the coil having different
shapes at the time of assembly are formed by the two through-holes having different shapes
being formed in the flange of the bobbin corresponding to the two guides. The two penetration
portions prevent the erroneous insertion and the guide portion can be reliably guided.
[0027]
The operation of the acoustic electromagnetic transducer according to claim 9 will be described
below.
According to the present invention, in addition to the same constitution as in claim 8, the through
portion corresponding to the guide portion formed in a semicircular shape in cross section
among the two through portions is from the outer periphery of the flange portion of the bobbin
It has the structure formed in slit shape to this guide part.
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[0028]
Therefore, according to the present invention, the penetrating portion corresponding to the guide
portion having a semicircular cross-sectional shape is formed in a slit shape, so that the lead wire
of the coil can be made easier to the guide portion at the time of assembly. It came to be able to
lead.
[0029]
According to the present invention, it is possible not only to reduce the manufacturing cost by
simply insulating and locking the lead wire which is the end of the coil, but also to accurately
position the coil with respect to the yoke etc. to enhance the performance. An electromagnetic
conversion device is obtained.
[0030]
Hereinafter, an embodiment of an acoustic electromagnetic conversion device according to the
present invention is shown in FIGS. 1 to 5, and this embodiment will be described based on these
drawings.
As shown in FIG. 1, a case main body 12 and a case main body 12 are cylindrically formed with a
nonmagnetic material storage member which is the outer space of the acoustic electromagnetic
conversion device 10 to which the present embodiment is applied. The case cover 14 is screwed
with a bolt 16 so as to close the left end, and has a structure having a space inside the storage
member formed by the case body 12 and the case cover 14. There is.
[0031]
The case body 12 has a cylindrical space inside and has a through hole 12A at the left end which
is a bottom portion, and the telescopic transmission rod 18 has a shape in which the tip side
protrudes from the through hole 12A of the case body 12 , Is disposed on the left end side of the
case body 12.
An external thread is formed on the tip end side of the extension transmission rod 18, and a
diaphragm (not shown) is screwed and connected.
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[0032]
On the other hand, a flange portion 18A is formed on the proximal end side of the extension
transmission rod 18, and an elastic body 22 formed of a rubber material or the like is formed
between the flange portion 18A and the bottom of the case main body 12. The elastic body 22 is
always pressed to the right in FIG. 1 so that the elastic transmission rod 18 is disposed.
[0033]
The upper yoke 24 is fitted on the right end side of the expansion transmission rod 18 in FIG. 1
and on the right side of the upper yoke 24 there is a bobbin 30 having flange portions 30A at
both ends and winding a wire. A circular tubular bias magnet 34 is disposed on the outer
peripheral side of the coil 26.
A bar-shaped magnetostrictive element 28 is built in the center of the bobbin 30 so as to be
expandable and contractible, and the left end side of the magnetostrictive element 28 in FIG. 1 is
in contact with the upper yoke 24. Further, a yoke 36 formed in a disk shape with a magnetic
material such as iron is disposed on the right side of the bobbin 30 in FIG. 1, and the right end
side of the magnetostrictive element 28 is in contact with the yoke 36. .
[0034]
As described above, in the present embodiment, the elastic body 22, the magnetostrictive
element 28, the bias magnet 34, the bobbin 30, and the yoke 36 are located adjacent to each
other on the right end side in FIG. The yoke 36 and the like are disposed in the storage member.
[0035]
As shown in FIG. 1, two guide portions 31 each having a dimension L2 longer than a dimension
L1 obtained by adding the thicknesses of the yoke 36 and the case lid 14 to the flange portion
30A constituting one end side of the bobbin 30. , 32 are integrally molded with the bobbin 30 by
a synthetic resin material.
[0036]
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10
Accordingly, the two guides 31 and 32 respectively extend along the direction in which the
magnetostrictive element 28 extends, and the holes 36A and 14A are provided in the yoke 36
and the case cover 14 with the two guides 31 and 32. While fitting, the yoke 36 and the case lid
14 are respectively penetrated.
Along with this, the lead wire 26A on the winding start side and the leader wire 26B on the
winding end side of the coil 26 are respectively guided by these guides 31 and 32 and pulled out
of the case lid 14. .
[0037]
However, as shown in FIGS. 4 and 5, one of the two guide portions 31 and 32 has a circular
cross-sectional shape as it is formed into a circular tubular shape, and The other guide portion
32 is formed into a semicircular cross-sectional shape as it is formed into a semicircular tubular
shape, and the cross-sectional shapes of the two guide portions 31 and 32 are different from
each other.
[0038]
A terminal plate 40 having two electrode terminals 42 is fastened to the right side of the yoke 36
and the case cover 14 in FIG. 1 by bolts 44 so that the terminal board 40 is fixed to the case
cover 14. The lead wires 26A, 26B penetrating the plate 40 are respectively twisted from these
electrode terminals 42.
[0039]
Under the present circumstances, as shown in FIG.2 and FIG.3, the convex part 46 used as a 1st
engaging part is formed in the case cover part 14, and the recessed part 48 used as a 2nd
engaging part in the terminal board 40. The positioning of the terminal plate 40 in the rotational
direction with respect to the case lid portion 14 is achieved by the engagement between the
convex portion 46 and the concave portion 48.
[0040]
Then, in the terminal plate 40, two concave relief portions 40A and 40B are formed
corresponding to the two guide portions 31 and 32 protruding through the case lid portion 14,
respectively. As shown in FIG. 2 and FIG. 3, the cross-sectional shape of one relief 40A is formed
to be circular and the cross-sectional shape of the other relief 40B is semicircular in accordance
with the shapes of these two guides 31 and 32. In the formed form, the shapes of these two
reliefs 40A, 40B differ from one another.
04-05-2019
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[0041]
Next, the operation of the acoustic electromagnetic conversion device 10 according to the
present embodiment will be described.
According to the acoustic electromagnetic conversion device 10 of the present embodiment, the
wire forming the coil 26 for generating a magnetic field is wound on the bobbin 30, and the
magnetostrictive element 28 is disposed at the center of the bobbin 30, A yoke 36 is disposed in
contact with one end of the bobbin 30.
The case main body 12 and the case cover 14 hold and hold these members, and the terminal
plate 40 having the terminal electrode 42 is fitted to the case cover 14.
[0042]
Further, two guide portions 31, 32 each having a dimension L2 longer than the dimension L1
obtained by adding the thicknesses of the yoke 36 and the case lid portion 14 integrally with the
collar 30A at one end of the bobbin 30 by a synthetic resin material. The guide wires 26A and
26B of the coil 26 are formed as the guide portions 31 and 32 with the structure in which the
guide portions 31 and 32 are fitted and penetrated through the yoke 36 and the case lid portion
14, respectively. , 32 and is drawn out of the case lid 14 and guided to the terminal plate 40.
[0043]
That is, two guides 31 and 32 are formed on one end side of the bobbin 30 facing the yoke 36,
and the lead wires 26A and 26B of the coil 26 are disposed along the guides 31 and 32. The
conductive metal material such as the yoke 36 and the case cover 14 can be isolated easily and
reliably from the lead wires 26A and 26B and can be insulated, and at the same time, the lead
wires 26A and 26B can be locked. No need to use insulating tubes or tapes.
[0044]
Furthermore, as described above, the guide portions 31 and 32 formed on the bobbin 30 are
fitted to the yoke 36 and the case lid portion 14, so that the yoke 36 and the case lid portion 14
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12
are wound around the bobbin 30. Accurate positioning of the coil 26 has become possible.
As a result, the coil 26 can be installed so that the center of the coil 26 is accurately positioned at
the center of the facing surface of the yoke 36. When a current is applied to the coil 26, the
magnetic field generated by the coil 26 is uniform and stable. In addition to the magnetostrictive
element 28, the amount of expansion and contraction of the magnetostrictive element 28 is
stabilized.
[0045]
From the above, according to the electromagnetic transducer 10 for sound of the present
embodiment, the structure is simplified as the lead wires 26A, 26B to be the end of the coil 26
are simply insulated and locked. As a result, it is possible not only to reduce the manufacturing
cost and to reduce the size, but also to position the coil 26 accurately with respect to the yoke 36
etc. to improve the performance.
[0046]
Further, according to the present embodiment, the bobbin 30 and the two guide portions 31 and
32 are integrally formed of a synthetic resin material, which reduces the manufacturing cost
when manufacturing the guide portions 31 and 32. As a result, these guides 31 and 32 can be
arranged more accurately with respect to the bobbin 30.
[0047]
On the other hand, in the present embodiment, not only two guide portions are present and the
cross sectional shapes of the two guide portions 31 and 32 are different from each other, but
also in the terminal plate 40 provided with the electrode terminals 42, Two relief portions 40A
and 40B having different shapes are formed corresponding to the two guide portions 31 and 32,
respectively.
[0048]
Therefore, according to the present embodiment, the cross-sectional shapes of the two guide
portions 31 and 32 are made different from each other, and the lead wire 26A on the winding
start side is disposed on one guide portion 31 having a circular cross-sectional shape. And the
leader wire 26B on the winding end side is disposed in the other guide portion 32 whose crosssectional shape is semicircular, so that the leader wire 26A on the winding start side and the
04-05-2019
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leader wire 26B on the winding end are always constant It became possible to arrange in 31, 32
respectively.
As a result, the problem of incorrect insertion of the lead wires 26A, 26B of the coil 26 at the
time of assembly is also solved.
[0049]
At this time, as shown in FIG. 5, two through portions 30B and 30C are respectively formed in
the collar 30A of the bobbin 30 corresponding to the two guides 31 and 32.
However, although the shape of these two penetration parts 30B and 30C mutually differs,
although the penetration part 30B corresponding to the guide part 31 in which the crosssectional shape was formed circularly is made circular, the cross-sectional shape is a semicircle
The through portion 30C corresponding to the guide portion 32 formed in the above is formed in
a slit shape extending from the outer periphery of the collar portion 30A of the bobbin 30 to the
guide portion 32.
[0050]
Therefore, according to the present embodiment, two penetrating portions 30B and 30C having
mutually different shapes are formed in the collar portion 30A of the bobbin 30 corresponding
to the two guide portions 31 and 32, thus The lead wires 26A, 26B of the coil 26 are prevented
from being erroneously inserted by the two penetrating portions 30B, 30C having different
shapes, and the guide portions 31, 32 can be surely guided.
[0051]
Further, the through portion 30C corresponding to the guide portion 32 having a semicircular
cross-sectional shape is formed in a slit shape, so that the lead wire 26B of the coil 26 can be
more easily guided to the guide portion 32 at the time of assembly. It also became.
[0052]
Further, the cross-sectional shape of one relief portion 40A of terminal plate 40 is formed in a
circular shape in accordance with the shape of one guide portion 31, and the other relief portion
of terminal plate 40 is formed in accordance with the shape of the other guide portion 32. By
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14
forming the cross-sectional shape of 40B in a semicircular shape, erroneous insertion of terminal
plate 40 into case lid 14 during assembly can be prevented, and lead wire 26A of winding start
side of coil 26 in terminal plate 40 can be prevented. The arrangement and the arrangement of
the lead wire 26B on the winding end side are always constant.
[0053]
On the other hand, in the present embodiment, the convex portion 46 which is the first engaging
portion is formed in the case lid portion 14 and the concave portion 48 which is the second
engaging portion is formed in the terminal plate 40. The terminal plate 40 is positioned relative
to the case lid 14 by engagement with the case 48.
Therefore, according to the present embodiment, the engagement between the convex portion 46
and the concave portion 48 reliably positions the terminal plate 40 with respect to the case lid
portion 14 and improves the workability at the time of assembly. I was supposed to
[0054]
In the above embodiment, the cross-sectional shape of one of the two guide portions 31 and 32
of the bobbin 30 is circular, and the cross-sectional shape of the other guide portion 32 is
semicircular. In addition, the cross-sectional shape between the two guide portions 31 and 32
and the cross-sectional shape between the two guide portions 31 and 32 are formed such that
the cross-sectional shape of one relief portion 40A of terminal plate 40 is circular and the crosssectional shape of the other relief portion 40B is semicircular. Although the cross-sectional
shapes between the two clearances 40A and 40B are different from each other, these shapes may
be other shapes, for example, a polygonal cross-sectional shape such as a triangle or a
quadrangle.
[0055]
Furthermore, although the bobbin 30 and the guide portions 31 and 32 are formed of a polymer
material such as a synthetic resin, it is conceivable to specifically use, for example, a liquid crystal
polymer or PPS (polyphenylene sulfide) resin.
On the other hand, in the above embodiment, the first engaging portion of the case lid portion 14
04-05-2019
15
is a convex portion, and the second engaging portion of the terminal plate 40 is a concave
portion, but the convex portion and the concave portion may be formed reversely. good.
[0056]
FIG. 1 is a cross-sectional view of a sound electromagnetic transducer according to an
embodiment of the present invention.
It is a 2-2 arrow line-of-sight figure (leader was omitted) of FIG.
It is a principal part disassembled perspective view of an electromagnetic transducer for sound
concerning one embodiment of the present invention.
It is a perspective view of a bobbin applied to an electromagnetic transducer for sound
concerning one embodiment of the present invention.
FIG. 5 is a cross-sectional view taken along line 5-5 in FIG.
It is a perspective view of a bobbin applied to an electromagnetic transducer for sound
concerning a prior art.
Explanation of sign
[0057]
DESCRIPTION OF SYMBOLS 10 Acoustic electromagnetic conversion apparatus 12 Case main
part 14 Case cover part 26 Coil 28 Magnetostrictive element 30 Bobbin 30A Flange part 30B
Penetration part 30C Penetration part 31 Guide part 32 Guide part 36 Yoke 40 Terminal plate
40A Relief part 40B Relief part 42 Electrode terminal 46 Convex part (first engagement part) 48
Concave part (second engagement part)
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