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JP2015080064

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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
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2015080064
An object of the present invention is to improve the connection reliability by reducing the
number of connection points as well as facilitating the connection between the coil and the
external connection terminal while arranging the external connection terminal along the back
surface of the housing. An electroacoustic transducer (1) for converting an electric signal into a
sound wave and outputting the sound wave, a housing (2) having a sound wave output port (4a)
on the front side, and a balanced armature type drive unit arranged in the housing 10, a
diaphragm 3a, and an external connection terminal 31 disposed along the back side of the
housing and electrically connected to the coil 51 of the drive unit, and the external connection
terminal receives an electrical signal from the outside. External connection portion 32 and a coil
connection portion 33 surrounded by a bobbin 21 connected to the coil and around which the
coil is wound, wherein the coil connection portion is directly connected to the coil and held by
the pad Are arranged along the back of the housing. [Selected figure] Figure 2
Electro-acoustic transducer
[0001]
The present invention relates to a balanced armature type electroacoustic transducer used for
medical equipment and audio equipment.
[0002]
As electro-acoustic transducers used in medical devices such as hearing aids and acoustic devices
such as earphones and headsets, those equipped with a drive unit of balanced armature type are
known.
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1
[0003]
For example, the electro-acoustic transducer disclosed in Patent Document 1 includes a housing
having a sound wave output port on the front side, a balanced armature type drive unit and a
diaphragm disposed in the housing, and a disposition along the back of the housing. And an
external connection terminal electrically connected to the coil of the drive unit, and configured to
convert an electric signal input from the external connection terminal into a sound wave by the
drive unit and the diaphragm and output it from the output port It is done.
[0004]
According to such an electro-acoustic transducer, since the terminal for external connection is
disposed along the back surface of the housing, there is no protrusion in the upper and lower
surface direction and the left and right side direction, and the nominal diameter around the
sound emission direction is This can contribute to the miniaturization of medical equipment and
acoustic equipment in which the electroacoustic transducer is incorporated.
[0005]
JP-A-2-274200
[0006]
However, in the conventional electroacoustic transducer, when the external connection terminals
are arranged along the back surface of the housing, the terminal substrate on which the external
connection terminals are mounted is fixed to the back surface portion of the housing, and the
terminal substrate Because the coils are electrically connected to each other, the connection of
the lead wire to the terminal substrate is not easy, and there is a risk of disconnection at the time
of connection work.
In addition, it is difficult to obtain high connection reliability because it is necessary to perform
two wire connection operations for one external connection terminal.
[0007]
Therefore, the present invention has been made in view of the above problems, and while the
external connection terminal is disposed along the back surface of the housing, the connection
between the coil and the external connection terminal is facilitated. It is another object of the
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present invention to provide an electroacoustic transducer which can reduce connection points
and improve connection reliability.
[0008]
The present invention has been proposed to achieve the above object, and is an electroacoustic
transducer that converts an externally input electric signal into a sound wave and outputs the
sound wave, and a housing having a sound wave output port on the front side. An external
connection terminal disposed along the back side of the housing and electrically connected to a
coil of the drive unit, the drive unit and diaphragm of the balanced armature type disposed in the
housing; A terminal having an external connection portion to which an electric signal is input
from the outside and a coil connection portion connected to the coil and surrounded by a bobbin
around which the coil is wound, and the coil connection portion is directly connected to the coil;
An electro-acoustic transducer is provided, characterized in that the external connection is
arranged along the back of the housing.
[0009]
According to the electro-acoustic transducer of the present invention, the terminal for external
connection is disposed along the back of the housing, and the connection between the coil and
the terminal for external connection is not only facilitated but also the connection point
Connection reliability can be improved.
[0010]
It is sectional drawing of the earphone with which the electroacoustic transducer based on
embodiment of this invention was integrated.
It is a sectional view of an electroacoustic transducer concerning an embodiment of the present
invention.
It is an exploded perspective view of an electroacoustic transducer concerning an embodiment of
the present invention.
It is a perspective view which shows the terminal for external connection and magnet strap
before insert molding of the electroacoustic transducer which concerns on embodiment of this
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invention.
It is a perspective view showing the terminal for external connection after insert molding of an
electroacoustic transducer concerning an embodiment of the present invention, a pad, a bobbin,
and a magnet strap.
It is a perspective view showing the completion state of the drive unit in the electroacoustic
transducer concerning the embodiment of the present invention.
[0011]
Hereinafter, preferred embodiments according to the present invention will be described in detail
with reference to the drawings.
The same components are denoted by the same reference numerals throughout the description
of the embodiment.
[0012]
FIG. 1 is a cross-sectional view of an earphone in which an electro-acoustic transducer according
to an embodiment of the present invention is incorporated.
As shown in FIG. 1, an electroacoustic transducer 1 according to an embodiment of the present
invention is incorporated in an earphone 100, a headset, a hearing aid or the like in order to
convert an electrical signal into a sound wave. For example, the earphone 100 shown in FIG. 1
includes a bush 101 for holding the electroacoustic transducer 1, a cable 102 electrically
connected to the electroacoustic transducer 1, a body 103 covering the bush 101, and an end of
the body 103. And an ear pad 104 attached to the part, and the ear pad 104 is used by being
inserted into the ear.
[0013]
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The cable 102 is connected to an audio device (not shown) such as a music player, a television, a
radio, etc. via a connector (not shown) provided on the other end side, and an electroacoustic
transducer is used to output the electrical signal output from the audio device. Enter 1 The
electroacoustic transducer 1 converts the input electric signal into a sound wave, and outputs the
converted sound wave from the front end side. Then, the sound wave output from the
electroacoustic transducer 1 is propagated through the body 103 and the sound guiding holes
103 a and 104 a of the ear pad 104 into the user's ear.
[0014]
Next, the configuration of the electroacoustic transducer 1 according to the embodiment of the
present invention will be described with reference to FIGS. 2 and 3.
[0015]
FIG. 2 is a cross-sectional view of an electro-acoustic transducer according to an embodiment of
the present invention, and FIG. 3 is an exploded perspective view of the electro-acoustic
transducer according to an embodiment of the present invention.
As shown in FIGS. 2 and 3, the electroacoustic transducer 1 includes a housing 2, a diaphragm
unit 3 and a drive unit 10.
[0016]
The housing 2 comprises a top housing 4 and a bottom housing 5. The top housing 4 and the
bottom housing 5 are fixed to each other using fixing means such as laser welding and bonding
while holding the diaphragm unit 3.
[0017]
The bottom housing 5 has a box shape whose upper surface is open. The top opening of the
bottom housing 5 is covered with the diaphragm unit 3, and the drive unit 10 is disposed in a
space covered by the bottom housing 5 and the diaphragm unit 3.
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[0018]
The drive unit 10 is fixed to the bottom of the bottom housing 5 via a spacer 6 in order to
magnetically shield it. Specifically, after fixing the spacer 6 to the bottom portion of the bottom
housing 5 using fixing means such as laser welding or adhesion, the drive unit 10 is fixed to the
spacer 6 using fixing means such as laser welding or adhesion doing.
[0019]
The top side of the diaphragm unit 3 is covered by the top housing 4. The top housing 4 is
partially formed with a notch serving as a sound wave output port 4a, and the space covered by
the diaphragm unit 3 and the top housing 4 is outside the housing 2 through the notch. It
communicates with the space. In addition, in this specification, the formation site | part of the
output port 4a in the housing 2 is made into a front side.
[0020]
Next, the configuration of the drive unit 10 will be described with reference to FIGS. 2 and 3.
[0021]
As shown in FIGS. 2 and 3, the drive unit 10 includes an armature 11, a bobbin 21, a pair of
external connection terminals 31, a pad 41, a coil 51, a pair of magnets 61, a magnet strap 71,
and a drive pin 81.
[0022]
The armature 11 is a member formed by bending a metal plate into a substantially E shape in
plan view, and the substrate 12, a pair of side plates 13 extending from both ends of the
substrate 12, and a side plate from the center of the substrate 12 And a vibrating portion 14
extending between the portions 13.
The pair of side plate portions 13 is fixed to the outer side surface portion of the magnet strap
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71 using fixing means such as laser welding.
[0023]
The bobbin 21 has a base portion 22, a coil winding portion 23 on which the coil 51 is wound,
and a magnet positioning portion 24 on which the pair of magnets 61 are positioned. The base
portion 22 and the coil winding portion 23 and the magnet positioning portion 24 are integrally
molded of a resin material.
[0024]
The base portion 22 constitutes a plane substantially parallel to the substrate portion 12 of the
armature 11.
A through hole 25 through which the vibrating portion 14 of the armature 11 penetrates is
formed at the central portion of the base 22.
In the upper part of the base 22, a part of the pair of external connection terminals 31 is
embedded. The external connection terminal 31 includes an external connection portion 32 for
inputting an electric signal from the outside, a coil connection portion 33 connected to the coil
51, an embedded portion 34 embedded in the bobbin 21, and a coil connection portion 33
(embedded portion 34 And a connecting portion 35 for connecting the external connecting
portion 32. The metal member is a reverse L-shaped metal member in a side view after
completion, and is integrated with the base 22 when the bobbin 21 is formed.
[0025]
The base portion 22 is integrally formed with a pair of convex portions 26 projecting to the back
side. The pair of projections 26 is formed at a position corresponding to the pair of notches 5 a
formed on the back surface of the bottom housing 5, and when the drive unit 10 is assembled to
the bottom housing 5, the projections 26. By fitting in the notch 5a of the bottom housing 5,
positioning of the drive unit 10 with respect to the bottom housing 5 is performed.
[0026]
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The connection portion 35 of the external connection terminal 31 protrudes from the tip end
surface of the convex portion 26 and is bent downward and connected to the external connection
portion 32. Thus, in a state where the drive unit 10 is fixed to the bottom housing 5, the external
connection portion 32 of the external connection terminal 31 is disposed along the back surface
of the housing 2.
[0027]
The coil winding portion 23 includes a pair of arm portions 23a and 23b arranged in parallel at a
predetermined distance so as to connect the base portion 22 and the magnet positioning portion
24. The coil 51 is formed by winding 52. The end portions of the coil wire 52 are respectively
wound on the coil connection portion 33 of the external connection terminal 31 and fixedly
connected to the coil connection portion 33 by arc welding or soldering thereafter.
[0028]
The magnet positioning portion 24 is formed to extend from the coil winding portion 23 to the
front side of the housing 2, and the coil winding portion 23 side is a magnet leaving a space
through which the vibrating portion 14 of the armature 11 is inserted. It is formed to cover the
strap 71. Then, the magnet 61 is positioned with respect to the bobbin 21 so that the pair of
magnets 61 vertically oppose each other across the space where the vibrating portion 14 of the
armature 11 is inserted. The magnet 61 is inserted into the magnet strap 71 from the front side,
and is fixed to the magnet strap 71 provided on the outside of the magnet positioning unit 24
using a fixing means such as adhesion.
[0029]
The magnet strap 71 is made of a magnetic material, and is integrally provided with the magnet
positioning portion 24 (bobbin 21) by being disposed outside the portion constituting the
magnet positioning portion 24 when the bobbin 21 is integrally molded. . The magnet strap 71
may be fixed to the bobbin 21 in a separate step after the bobbin 21 is formed.
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[0030]
The pad 41 is a resin member that holds the external connection portions 32 of the pair of
external connection terminals 31, and is disposed along the rear surface of the housing 2
together with the external connection portions 32 of the external connection terminals 31. The
pad 41 of the present embodiment is integrally formed with the pair of external connection
terminals 31 by resin separated from each other when molding the bobbin 21, but may be
formed at a timing different from that of the bobbin 21. Good.
[0031]
The pad 41 is bonded to the back surface of the housing 2 using an adhesive 91 after the drive
unit 10 is incorporated into the housing 2. At this time, the connecting portion 35 of the external
connection terminal 31 exposed outside the housing 2 is also covered with the adhesive 91, and
the gap between the convex portion 26 of the bobbin 21 and the housing 2 is also closed with
the adhesive 91. It is broken.
[0032]
The driving pin 81 fixes the side plate portion 13 of the armature 11 to the outer side surface
portion of the magnet strap 71 in a state where the vibrating portion 14 of the armature 11
penetrates between the coil 51 and the pair of magnets 61. It is fixed using fixing means such as
laser welding. The drive pin 81 fixed to the vibrating portion 14 extends upward, and the upper
end thereof is fixed to the diaphragm 3a of the diaphragm unit 3 by using a fixing means such as
adhesion or laser welding when the drive unit 10 is incorporated into the housing 2 Be done.
[0033]
Next, the operation of the electro-acoustic transducer 1 according to the embodiment of the
present invention will be described.
[0034]
In the electro-acoustic transducer 1, a magnetic circuit is configured by the pair of magnets 61,
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and a DC magnetic field is generated between the magnets 61.
Here, when an electric signal is applied to the coil 51 through the pair of external connection
terminals 31, an AC magnetic flux is generated, and this AC magnetic flux is generated in the
vibrating portion 14 of the armature 11, the magnet 61, the magnet strap 71, and the armature
11. By flowing through the magnetic circuit composed of the side plate portion 13 and the
substrate portion 12, an alternating magnetic field is generated between the magnet 61 and the
vibrating portion 14 of the armature 11. The AC magnetic field is superimposed on the abovedescribed DC magnetic field to vibrate the vibrating portion 14 of the armature 11. The vibration
of the vibrating portion 14 is transmitted to the diaphragm 3a of the diaphragm unit 3 through
the drive pin 81, and the diaphragm 3a vibrates. When the diaphragm 3a vibrates, the pressure
in the space covered by the diaphragm unit 3 and the top housing 4 fluctuates, and this pressure
fluctuation becomes a sound wave and is output from the output port 4a to the outside of the
housing 2.
[0035]
The electroacoustic transducer 1 of the present embodiment is provided with a spout 7 having a
cylindrical sound conducting portion 7a, and this spout 7 is laser-welded, bonded, etc. on the
front upper portion of the housing 2 where the output port 4a is formed. The directivity of the
sound wave output from the output port 4a is enhanced by fixing using the fixing means of the
above.
[0036]
Next, a manufacturing process of the drive unit 10 will be described with reference to FIGS.
[0037]
When manufacturing the drive unit 10, the pad 41 and the bobbin 21 are formed of resin by
insert molding, and the pair of external connection terminals 31 and the magnet strap 71 are
integrally formed of the resin.
[0038]
FIG. 4 is a perspective view showing the external connection terminal and the magnet strap
before insert molding of the electroacoustic transducer according to the embodiment of the
present invention.
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As shown in FIG. 4, when integrally forming the bobbin 21, the pair of external connection
terminals 31, the pad 41 and the magnet strap 71 by insert molding, the pair of externals is
disposed at a predetermined position of the insert molding die. The connection terminal 31 and
the magnet strap 71 are disposed.
[0039]
At this stage, the pair of external connection terminals 31 are integrally connected via the carrier
portion 36, and the connection portion 35 is also in a flat state before bending.
In addition, in the external connection portion 32 of each of the external connection terminals
31, in order to enhance the integrity with the pad 41, a convex portion 32a embedded in the pad
41 is three-dimensionally protruded and formed.
Further, in the embedded portion 34 of each external connection terminal 31, a connection hole
34a for connecting resin on the front and back is formed in order to enhance the integrity with
the bobbin 21 and bending for preventing the bobbin 21 from coming off The portion 34 b is
formed. If the connection hole 34a is not a through hole but has a semi-opened concavo-convex
shape, the base 22 and the embedded portion 34 become strong, and rigidity can be secured as a
support when bending the connection portion 35 with the notch 35a.
[0040]
FIG. 5 is a perspective view showing an external connection terminal, a pad, a bobbin and a
magnet strap after insert molding of the electroacoustic transducer according to the embodiment
of the present invention. As shown in FIG. 5, after the insert molding, an assembly A integrally
including the bobbin 21, the pair of external connection terminals 31, the pad 41, and the
magnet strap 71 is obtained. Then, after the insert molding, the carrier portion 36 of the external
connection terminal 31 is cut.
[0041]
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After the assembly A is formed, the pair of magnets 61 is incorporated into and fixed to the
magnet positioning portion 24 of the bobbin 21, and the coil lead wire 52 is wound around the
coil winding portion 23 of the bobbin 21 to form the coil 51. The end portions of the coil wire 52
are respectively wound on the coil connection portion 33 of the external connection terminal 31
and thereafter fixedly connected to the coil connection portion 33 by arc welding, soldering or
the like.
[0042]
That is, since the wire connecting operation of the external connection terminal 31 and the coil
51 is performed on the assembly A integrally provided with the bobbin 21 around which the coil
51 is wound and the external connection terminal 31, the coil 51 and the external connection
terminal 31 are connected. The connection work of the terminals 31 is facilitated, and
disconnection at the time of connection work can be prevented. Moreover, since the wire
connection work is performed at one place per one external connection terminal 31, the
connection reliability can be improved by reducing the number of connection places. The
external connection terminal 31 of the present embodiment has a protrusion 33a at the tip of the
coil connection portion 33, and the protrusion 33a prevents the coil wire 52 from coming off
from the coil connection portion 33 from being removed. There is. Further, as shown in FIG. 4,
the coil connection portion 33 is on the same plane as the external connection terminal 31
before bending and extends to the side of the base 22 and is positioned above the side plate
portion 13 of the armature 11. Therefore, the processing at the time of forming the coil
connection portion 33 is facilitated, and a space for arranging the coil connection portion 33 is
not necessary, and the device can be miniaturized.
[0043]
Next, the armature 11 is assembled to the assembly A. In this process, after the vibrating portion
14 of the armature 11 is penetrated through the through hole 25 of the bobbin 21, the side plate
portion 13 of the armature 11 is fixed to the outer surface of the magnet strap 71 using a fixing
means such as laser welding. To be done.
[0044]
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FIG. 6 is a perspective view showing the completed state of the drive unit in the electroacoustic
transducer according to the embodiment of the present invention. As shown in FIG. 6, after
assembling the armature 11 to the assembly A, the connecting portion of the external connection
terminal 31 is arranged so that the external connection portion 32 and the pad 41 of the external
connection terminal 31 are along the back surface of the housing 2. Bending 35 Notches 35a are
formed on both sides of the connecting portion 35, and at the time of bending, the connecting
portion 35 is bent starting from the notches 35a.
[0045]
Finally, the drive pin 81 is fixed to the vibrating portion 14 of the armature 11 passing through
the assembly A using fixing means such as laser welding, whereby the drive unit 10 is completed.
[0046]
Next, the process of incorporating the drive unit 10 into the housing 2 will be described with
reference to FIGS. 2 and 3.
[0047]
When the drive unit 10 is incorporated into the housing 2, first, the drive unit 10 is
accommodated inside the bottom housing 5.
At this time, the projection 26 formed on the bobbin 21 of the drive unit 10 is fitted in the notch
5 a of the bottom housing 5, whereby the positioning of the drive unit 10 with respect to the
bottom housing 5 is performed.
Then, when the drive unit 10 is positioned with respect to the bottom housing 5, the bottom of
the drive unit 10 is fixed to the spacer 6 fixed to the bottom of the bottom housing 5 using fixing
means such as laser welding or adhesion.
[0048]
Next, the top opening of the bottom housing 5 is covered with the diaphragm unit 3. At this time,
03-05-2019
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the upper end portion of the drive pin 81 is fixed to the diaphragm 3a of the diaphragm unit 3 by
bonding, laser welding or other fixing means, and the bottom housing 5 and the diaphragm unit
3 are fixed by laser welding, adhesion or the like Use to fix.
[0049]
Next, the top housing 4 covers the upper side of the diaphragm unit 3. At this time, the top
housing 4 sandwiches the diaphragm unit 3 with the bottom housing 5 and is fixed to the bottom
housing 5 using fixing means such as laser welding, adhesion, etc. to form the housing 2. Then,
after the formation of the housing 2, the spout 7 is fixed to the front upper portion of the
housing 2 using fixing means such as laser welding and adhesion.
[0050]
Next, the external connection portion 32 and the pad 41 of the external connection terminal 31
along the back surface of the housing 2 are bonded to the back surface of the housing 2 using
the adhesive 91. At this time, the connecting portion 35 of the external connection terminal 31
exposed outside the housing 2 is covered with the adhesive 91, and the gap between the convex
portion 26 of the bobbin 21 and the housing 2 is also closed with the adhesive 91. Make it In the
above process, the drive unit 10 is incorporated into the housing 2 and the electroacoustic
transducer 1 is completed.
[0051]
According to the embodiment described above, the housing 2 having the sound wave output port
4 a on the front side, the balance armature type drive unit 10 and the diaphragm 3 a disposed in
the housing 2, and the back surface of the housing 2. And an external connection terminal 31
electrically connected to the coil 51 of the drive unit 10, and an electric signal input from the
external connection terminal 31 is converted into a sound wave by the drive unit 10 and the
diaphragm 3a. The electro-acoustic transducer 1 that outputs from the output port 4a, the
external connection terminal 31 is provided with an external connection portion 32 for inputting
an electric signal from the outside, and a coil connection portion 33 connected to the coil 51 A
pad 41 for holding the connection portion 32 and a bobbin 21 around which the coil 51 is
wound are integrally formed of resin with the external connection terminal 31. The coil 51
wound in 1 is directly connected to the coil connection portion 33, while the external connection
03-05-2019
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portion 32 and the pad 41 are along the back surface of the housing 2. Therefore, the external
connection terminals 31 are arranged along the back surface of the housing 2. The conductor
connection work of the external connection terminal 31 and the coil 51 is performed on the
assembly A integrally including the bobbin 21 around which the coil 51 is wound and the
external connection terminal 31 while the electro-acoustic transducer 1 is As a result, the
connection work of the coil 51 and the external connection terminal 31 becomes easy, and
disconnection at the time of connection work can be prevented. Moreover, since the coil 51 is
directly connected to the coil connection portion 33 of the external connection terminal 31 and
the wire connection work of the coil 51 is one place for one external connection terminal 31, the
number of connection points is reduced to improve connection reliability. Can be improved.
[0052]
Further, since the pad 41 and the bobbin 21 are formed of resin separated from each other and
integrally coupled via the external connection terminal 31, the pad 41 and the bobbin are
compared with the case where the pad 41 and the bobbin 21 are integrally molded. The degree
of freedom of the shape and arrangement of 21 can be enhanced.
[0053]
Further, the external connection terminal 31 is formed by bending the connection portion 35
connecting the pad 41 and the bobbin 21 so that the external connection portion 32 and the pad
41 are along the back surface of the housing 2. By bending the connecting portion 35 after the
attaching process, the external connection portion 32 and the pad 41 can be made along the
back surface of the housing 2 without disturbing the assembling process of the armature 11.
[0054]
Further, since the connecting portion 35 of the external connection terminal 31 is covered with
the adhesive 91 when the pad 41 is adhered to the back surface of the housing 2, the connecting
portion 35 of the external connection terminal 31 and the housing 2 and other members Not
only can the short circuit be prevented, but the manufacturing process can be simplified as
compared to the case where the connecting portion 35 is covered in a separate process.
[0055]
Although the preferred embodiments of the present invention have been described above in
detail, the present invention is not limited to the above-described embodiments, and various
modifications may be made within the scope of the subject matter of the present invention
03-05-2019
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described in the claims. Changes are possible.
For example, when forming the unit A, the pad 41 may not be formed on the external connection
terminal 31 and only the external connection portion 32 may be along the back surface.
In this case, by providing a thin resin sheet or the like between the external connection portion
32 and the back surface of the housing 2 for insulation or the like, the distance between the
external connection portion 32 along the back surface and the back surface of the housing 2 can
be shortened. Can be miniaturized.
[0056]
For example, although the electroacoustic transducer of the said embodiment is equipped with a
pair of terminal for external connection, the number of objects of the terminal for external
connection is not limited to a pair.
For example, the present invention can be effectively implemented even in an electroacoustic
transducer that has been made into three terminals by the addition of a GND connection.
[0057]
DESCRIPTION OF SYMBOLS 1 ... electroacoustic transducer, 2 ... housing, 3 ... diaphragm unit, 3a
... diaphragm, 4 ... top housing, 4a ... output port, 5 ... bottom housing, 5a ... notch part, 6 ...
spacer, 7 ... spout, 7a ... sound conductor portion 10: drive unit, 11: armature, 12: base plate
portion, 13: side plate portion, 14: vibration portion, 21: bobbin, 22: base, 23: coil winding
portion, 23a, 23b, arm portion 24: Magnet positioning portion 25: Through hole 26: convex
portion 31: external connection terminal 32: external connection portion 32a: convex portion 33:
coil connection portion 33a: projection portion 34: embedded portion , 34a: connecting hole,
34b: bent portion, 35: connecting portion, 35a: notch, 36: carrier portion, 41: pad, 51: coil, 52:
lead wire for coil, 61: magnet, 71: Magnetstra Flop, 81 ... drive pin, 91 ... adhesives, 100 ...
earphone, 101 ... bush, 102 ... cable, 103 ... Body, 103a, 104a ... Otoshirubeana, 104 ... ear pad
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