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JP2003219498

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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
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DESCRIPTION JP2003219498
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
so-called electrodynamic electroacoustic transducer, and more particularly to a coil end
processing structure of its voice coil.
[0002]
2. Description of the Related Art An electrodynamic electroacoustic transducer is conventionally
known as a type of electroacoustic transducer such as a speaker. As disclosed in, for example,
Japanese Patent Laid-Open No. 6-178390, this electrodynamic electroacoustic transducer
generally has a diaphragm on which a voice coil is fixed on the lower surface, and an outer
peripheral edge portion of the diaphragm. It has composition provided with the frame supported
from the side. Further, in the electrodynamic electroacoustic transducer, a pair of lead wires
extending from the voice coil is conductively fixed to a pair of terminal members attached to the
lower surface of the frame by soldering or the like.
[0003]
Then, in the manufacturing process of such an electrodynamic electroacoustic transducer, after
bonding the diaphragm and the voice coil, the state in which both lead wires are drawn out from
the outer peripheral edge of the diaphragm to the outside of the frame The diaphragm and the
frame are adhered to each other, and after the integrated diaphragm, voice coil and frame are
once turned over, the end portions of the respective lead wires are conductively fixed to the
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respective terminal members.
[0004]
However, the above-described conventional electrodynamic electroacoustic transducer has the
following problems.
[0005]
That is, since it is necessary to turn over the diaphragm, the voice coil and the frame when
manufacturing the electroacoustic transducer, the manufacturing process becomes complicated.
[0006]
Further, when the diaphragm, the voice coil and the frame are turned over, the ends of the lead
wires are free, so that there is a possibility that disconnection may occur during the operation of
turning over the frame or the like.
[0007]
Furthermore, even after each lead wire is conductively fixed to each terminal member, each lead
wire is wired in a state where a part of the lead wire is exposed to the space outside the frame.
There is a risk of disconnection.
For this reason, even after completion of the electroacoustic transducer, it is necessary to pay
sufficient attention to its handling or to take some protective measures for preventing
disconnection.
[0008]
The present invention has been made in view of such circumstances, and it is possible to simplify
the manufacturing process of the electrodynamic electroacoustic transducer and to prevent the
breakage of the lead wire. It is an object of the present invention to provide an electroacoustic
transducer capable of
[0009]
SUMMARY OF THE INVENTION The present invention achieves the above object by devising the
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arrangement of the conductive fixing portion with each lead wire in each terminal member.
[0010]
That is, the electro-acoustic transducer according to the present invention comprises a
diaphragm, a voice coil fixed to the lower surface of the diaphragm, a diaphragm support
member for supporting the outer peripheral edge of the diaphragm, and the diaphragm support
member. An electro-acoustic transducer comprising: a pair of terminal members attached to each
other and to which a pair of lead wires extending from the voice coil are conductively fixed;
wherein the diaphragm support member supports the diaphragm The conductive fixing portion
with the lead wire in each of the terminal members is formed in a plate shape along the lower
surface of the diaphragm supporting member, which is performed from the upper surface side of
the diaphragm; It is a feature.
[0011]
In the above configuration, the term indicating the directivity such as "lower surface" or "upper
surface side" is used for the sake of convenience in order to clarify the positional relationship
between the members constituting the electroacoustic transducer, There is no limitation on the
directionality etc. when actually using the electroacoustic transducer.
[0012]
The type of the “electroacoustic transducer” is not particularly limited as long as it is an
electrodynamic transducer, and for example, a small speaker, a buzzer, a microphone, a receiver,
or the like can be adopted.
[0013]
The specific configurations of the “diaphragm” and the “voice coil” are not particularly
limited as long as they can be used as components of the electrodynamic electroacoustic
transducer.
[0014]
The specific configuration of the material, the shape, and the like of the “terminal member” is
particularly limited as long as the conductive fixed serving portion is a conductive member
formed in a plate shape along the lower surface of the diaphragm support member. It is not a
thing.
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[0015]
The above "conduction fixing" means fixing in an electrically connected mode, and the specific
method is not particularly limited, and for example, soldering, thermocompression bonding, etc.
are adopted. It is possible.
[0016]
In the electro-acoustic transducer according to the present invention, a pair of terminal members
are attached to a diaphragm supporting member for supporting the outer peripheral edge
portion of the diaphragm as described above. A pair of lead wires extending from the voice coil is
conductively fixed to the member, but support of the diaphragm by the diaphragm support
member is performed from the upper surface side of the diaphragm, and each of the terminal
members is Since the conductive fixed service part with the lead wire is formed in a plate shape
along the lower surface of the diaphragm support member, the following effects can be obtained.
[0017]
That is, when manufacturing the electroacoustic transducer, the lead wires can be conductively
fixed to the terminal members without the need to turn over the diaphragm support member as
in the conventional frame, so that the electroacoustic transducer can be manufactured.
Manufacturing process can be simplified.
In addition, it is possible to prevent the occurrence of disconnection during the work of turning
over the frame or the like as in the prior art.
Furthermore, even after each lead wire is conductively fixed to each terminal member, it is
possible to eliminate wiring in a state where a part of each lead wire is exposed to the space
outside the frame as in the prior art. It is possible to eliminate the possibility that the fingers or
the like touch the lead wires to cause disconnection.
[0018]
As described above, according to the present invention, in the electrodynamic electroacoustic
transducer, the manufacturing process thereof can be simplified, and breakage of the lead wire
can be prevented.
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[0019]
In the above configuration, if conduction fixing of each lead wire to each terminal member is
performed by thermocompression bonding, lead-free can be achieved compared to the case
where the conduction fixing is performed by soldering, Further, since the solder buildup space is
not required, the required space for conduction fixing can be reduced, and furthermore, the
reliability of the conduction fixing can be enhanced, and the occurrence rate of the conduction
failure can be significantly reduced.
[0020]
Here, “thermo-compression bonding” means a bonding method performed by applying heat
and pressure.
If the heating method at the time of this thermocompression bonding can melt the insulation
coating of each lead wire to such an extent that the core wire of each lead wire contacts each
conduction fixed service part by the above-mentioned pressing force, a specific method For
example, a method of heating by energizing between both lead wires, a method of energizing by
heating between heating jigs for sandwiching each lead wire and each terminal member or the
like, or A method of pressing a preheated thermocompression bonding jig on each lead wire can
be adopted.
[0021]
The material of the above-mentioned "diaphragm support member" is not particularly limited, but
if the diaphragm support member is made of an insulating member, it is necessary to form an
insulating film or the like on the surface of the diaphragm support member. Each of the terminal
members can be directly attached to the diaphragm support member.
[0022]
At that time, if the diaphragm support member is formed of a synthetic resin molded product and
each terminal member is integrally formed with the diaphragm support member by insert
molding, the attachment of each terminal member to the diaphragm support member The
strength can be sufficiently increased, and part of each terminal member can be easily exposed to
the external space of the electroacoustic transducer.
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[0023]
Further, in the above configuration, if the lower surface of the conduction fixing serving portion
in each terminal member is positioned below the outer peripheral edge portion of the diaphragm,
it is easy to wire each lead wire away from the diaphragm Possible.
By doing so, it is possible to prevent each lead from coming into contact with the diaphragm
during ringing of the electroacoustic transducer, so it is possible to prevent the generation of
abnormal noise.
In addition, since the possibility of disconnection of the lead wires due to the contact with the
diaphragm can be eliminated, the durability of the electroacoustic transducer can be improved.
Furthermore, the design freedom of the cross-sectional shape of the diaphragm can be increased.
[0024]
The amount of downward displacement of the lower surface of the conduction fixing service
portion in each terminal member relative to the outer peripheral edge portion of the diaphragm
is not particularly limited, and it depends on the size of the electroacoustic transducer, the cross
sectional shape of the diaphragm, etc. Although it may be set appropriately, for example, it is
preferably 0.1 mm or more, and more preferably 0.2 mm or more.
[0025]
Further, in the above configuration, the annular region located between the outer peripheral edge
of the diaphragm and the voice coil contact portion contacting the upper end of the voice coil is
an annular surface connecting the outer peripheral edge and the voice coil contact portion If it is
formed on the upper side, it becomes possible to wire each lead wire in a state of being separated
from the diaphragm more easily.
[0026]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings.
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[0027]
FIG. 1 is a side sectional view showing an electroacoustic transducer 10 according to an
embodiment of the present invention in the state of being disposed upward, and FIGS. 2 and 3
are a plan view and a bottom view thereof.
[0028]
As shown in these figures, the electro-acoustic transducer 10 according to the present
embodiment is a small-sized electrodynamic speaker, and is used in a state of being attached to
the substrate 2.
In the electro-acoustic transducer 10, a diaphragm subassembly 12 and a frame subassembly 14
are assembled.
[0029]
FIG. 4 is a bottom view showing the diaphragm subassembly 12 by itself.
[0030]
As also shown in this figure, the diaphragm subassembly 12 includes a diaphragm 16 having a
circular outer shape, a voice coil 18 fixed to the lower surface of the diaphragm 16 through a coil
support member 20, and a diaphragm 16. Diaphragm support member 22 for supporting the
outer peripheral edge portion 16a of the upper surface side, and a pair of terminals attached to
the diaphragm support member 22 and to which a pair of lead wires 18a extending from the
voice coil 18 are conductively fixed It consists of a member 24 and a pair of dummy terminal
members 26.
[0031]
The diaphragm 16 is a diaphragm-like member having a plurality of concavities and convexities
formed concentrically, and is formed by subjecting a synthetic resin film to heat press molding.
The outer peripheral edge portion 16a of the diaphragm 16 and the voice coil contact portion
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16b in contact with the upper end of the voice coil 18 are formed as an annular flat surface
located on the same horizontal surface.
An annular region 16c located between the outer peripheral edge portion 16a of the diaphragm
16 and the voice coil contact portion 16b is formed above the annular flat surface.
[0032]
The diaphragm support member 22 is a synthetic resin molded product having a substantially
square outer shape with a side length of about 20 mm, and a circular opening 22 a slightly
smaller in diameter than the diaphragm 16 is formed.
A ring-shaped diaphragm support flange 22b is formed along the circular opening 22a of the
diaphragm support member 22, and a plurality of crimps are formed on the outer peripheral side
of the diaphragm support flange 22b. The pieces 22c are formed at predetermined intervals in
the circumferential direction.
The diaphragm 16 is caulked and fixed to the diaphragm support member 22 by the caulking
pieces 22c in a state where the diaphragm 16 is placed on the diaphragm support flange portion
22b at the outer peripheral edge portion 16a.
[0033]
In the diaphragm support member 22, four corner portions 22d are formed on the outer
peripheral side of the diaphragm support flange portion 22b.
The lower surface 22d1 of each of the corner portions 22d is formed to be located about 0.4 to
0.8 mm below the diaphragm support flange portion 22b.
[0034]
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Each terminal member 24 and each dummy terminal member 26 are configured as a bent
product of a metal plate, and are integrally formed with the diaphragm support member 22 by
insert molding.
Each of the terminal members 24 is disposed at two corner portions adjacent to each other
among four corner portions 22 d of the diaphragm support member 22, and each dummy
terminal member 26 is disposed at the remaining two corner portions. .
The terminal members 24 and the dummy terminal members 26 are formed so as to protrude
laterally from the corner portions 22 d and to extend downward.
[0035]
Although circular holes 22e are formed in each corner portion 22d, these circular holes 22e are
placed at predetermined positions in the mold using the respective terminal members 24 as
inserts when the diaphragm support member 22 is injection-molded. It is formed by an insert
holding member disposed in the mold for positioning and holding.
[0036]
FIG. 5 is a cross-sectional view taken along line VV of FIG.
[0037]
As also shown in this figure, land portions 24a (conductive fixed serving portions) exposed to the
lower surface 22d1 of each corner 22d are formed flush with the lower surface 22d1 in each
terminal member 24.
The conduction fixing of the lead wires 18a to the terminal members 24 is performed by
thermocompression bonding the lead wires 18a to the land portions 24a.
The thermocompression bonding is performed as follows.
[0038]
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That is, first, a receiving jig (metal pin) is inserted into each of the circular holes 22e from above,
and the lower end surface of the receiving jig is brought into contact with the back surface of the
land portion 24a at the thermocompression bonding scheduled position.
Then, the lead wire 18a is disposed so as to pass through the position for thermocompression
bonding in the land portion 24a.
Thereafter, the thermocompression bonding jig (metal pin) disposed below the
thermocompression bonding planned position is raised, and the thermocompression bonding jig
presses the lead wire 18a against the land portion 24a with a predetermined pressing force, and
also performs thermocompression bonding. Electric current is applied instantaneously (about 20
to 30 msec) between the jig and the receiving jig.
Then, the insulating coating of the lead wire 18a is heated to 600 ° C. or higher and melted by
Joule heat generated at this time, and the lead wire 18a is fixed to the land portion 24a while the
core wire is in contact with the land portion 24a ( Thermocompression bonding).
[0039]
In addition, after this thermocompression bonding is completed, the extra-long portion on the tip
end side of the thermocompression bonding portion in the lead wire 18a is cut.
Then, an overcoat 28 is applied to the thermocompression-bonded portions of the respective lead
wires 18a formed by the thermocompression bonding.
[0040]
The heat generated at the time of the thermocompression bonding is rapidly transmitted from
the land portion 24 a to the receiving jig having a thermal conductivity higher than that of the
diaphragm support member 22, so the land portions 24 a at the respective corner portions 22 d
of the diaphragm support member 22. It is prevented in advance that the surrounding part of the
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is melted.
In addition, since the pressing force of the thermocompression bonding jig is received by the
receiving jig during thermocompression bonding, the lower surface 24a1 of the land portion 24a
sinks relative to the lower surface 22d1 of the corner portion 22d by the pressing force of the
thermocompression bonding jig. It is prevented in advance.
[0041]
On the other hand, each dummy terminal member 26 is merely provided to stably fix the electroacoustic transducer 10 to the substrate with four legs, and therefore no land portion is formed.
[0042]
As shown in FIGS. 1 and 3, the frame subassembly 14 comprises a magnetic circuit unit 30 and a
frame 32 for supporting the magnetic circuit unit 30.
[0043]
The magnetic circuit unit 30 comprises a steel base 34, a magnet 36, a steel yoke 38 and a rivet
40.
[0044]
The base 34 is formed in a cylindrical shape with a bottom, and an annular flange portion 34a is
formed on the outer peripheral portion thereof, and a circular through hole 34b is formed in the
bottom portion thereof.
Further, the magnet 36 and the yoke 38 are both formed in a ring shape, and are placed on the
bottom surface of the base 34 so as to be concentric with each other in this order, to form an
eyelet rivet 40 having a through hole 40a. It is being fixed to the base 34 by this.
Thus, a cylindrical magnetic gap for housing the lower end portion of the voice coil 18 is formed
with the same width all around between the outer peripheral surface of the yoke 38 and the
inner peripheral surface of the base 34 and the through hole 40 a of the rivet 40 is formed. To
form a sound emission hole.
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[0045]
The frame 32 is a synthetic resin molded product having substantially the same external shape
as the diaphragm support member 22, and a plurality of caulking pieces 32 a formed at
predetermined intervals in the circumferential direction are annular flange portions 34 a of the
base 34. The magnetic circuit unit 30 is supported by being crimped to the
[0046]
The assembly of the diaphragm subassembly 12 and the frame subassembly 14 is performed by
ultrasonic welding of the diaphragm support member 22 and the frame 32.
[0047]
A cover 42 is attached to the diaphragm subassembly 12 from above.
The cover 42 is a press-formed product of a metal plate, and a plurality of sound output holes 42
a are formed in a predetermined arrangement.
The cover 42 is attached by caulking and fixing a plurality of caulking pins 22 f formed on the
diaphragm support member 22 to the cover 42.
[0048]
As described above in detail, in the electroacoustic transducer 10 according to the present
embodiment, the pair of terminal members 24 is attached to the diaphragm support member 22
that supports the outer peripheral edge portion 16 a of the diaphragm 16. A pair of lead wires
18 a extending from the voice coil 18 is conductively fixed to the member 24, but the diaphragm
support member 22 supports the diaphragm 18 from the upper surface side of the diaphragm
18, and Since the conductive fixing serving portion with each lead wire 18a in each terminal
member 24 is formed in a plate shape along the lower surface 22d1 of each corner portion 22d
in the diaphragm support member 22 as the land portion 24a, the following An effect can be
obtained.
[0049]
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That is, when manufacturing the electro-acoustic transducer 10, the lead wires 18a can be
conductively fixed to the terminal members 24 without the need to turn over the diaphragm
support member 22 as in the conventional frame. The manufacturing process of the
electroacoustic transducer 10 can be simplified.
In addition, it is possible to prevent the occurrence of disconnection during the work of turning
over the frame or the like as in the prior art.
Furthermore, even after the lead wires 18a are conductively fixed to the terminal members 24, it
is possible to eliminate wiring in a state where a part of each lead wire 18a is exposed to the
space outside the frame as in the prior art. As a result, it is possible to eliminate the possibility
that a wire or the like of a person may touch the lead wires 18 a to cause disconnection.
[0050]
As described above, according to the present embodiment, in the electrodynamic electroacoustic
transducer, the manufacturing process thereof can be simplified, and breakage of the lead wire
can be prevented.
[0051]
Moreover, in the present embodiment, since the conduction fixing of each lead wire 18a to each
terminal member 24 is performed by thermocompression bonding, lead-free is made compared
to the case where the conduction fixing is performed by soldering. Also, since the solder buildup
space is not required, the required space for conduction fixing can be reduced, and furthermore,
the reliability of the conduction fixing is increased, and the occurrence rate of the conduction
failure can be greatly reduced. .
[0052]
Further, in the present embodiment, since the diaphragm support member 22 is configured as a
synthetic resin molded product and each terminal member 24 is integrally formed with the
diaphragm support member 22 by insert molding, each terminal member 24 is formed. The
attachment strength to the diaphragm support member 22 can be sufficiently enhanced, and the
leg portion of each terminal member 24 can easily be made to face the external space of the
electroacoustic transducer 10.
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[0053]
Furthermore, in the present embodiment, the lower surface 24a1 of the land portion 24a of each
terminal member 24 is positioned about 0.4 to 0.8 mm below the outer peripheral edge portion
16a of the diaphragm 16, so each lead wire 18a Can be easily wired in a state of being separated
from the diaphragm 16.
And thereby, since each lead wire 18a can be prevented from contacting with the diaphragm 16
during ringing of the electroacoustic transducer 10, generation | occurrence | production of
noise can be prevented beforehand.
In addition, since the possibility of disconnection of the lead wires 18a due to the contact with
the diaphragm 16 can be eliminated, the durability of the electroacoustic transducer 10 can be
improved.
Furthermore, the design freedom of the cross-sectional shape of the diaphragm 16 can also be
increased.
[0054]
Further, in the present embodiment, an annular plane surface 16c between the outer peripheral
edge portion 16a of the diaphragm 16 and the voice coil contact portion 16b connects the outer
peripheral edge portion 16a and the voice coil contact portion 16b. Since it is formed on the
upper side more than the above, it becomes possible to wire each lead wire 18a in a state of
being separated from the diaphragm 16 more easily.
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