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JP2004040612

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2004040612
An object of the present invention is to facilitate assembly, improve yield, and reduce cost. An
upper portion 21a and a lower portion 21b are formed on the outer periphery of a second frame
21 which is a diaphragm support ring. The laser beam 26 has its beam intensity and focal length
adjusted by experiments in advance. The peripheral portion 23a of the diaphragm 23 to which
the voice coil is bonded is placed on and held in close contact with the lower portion 21b of the
second frame 21 which is turned upside down, with the voice coil side facing upward. Next, the
laser beam 26 is irradiated from above along the flat portion of the diaphragm 23. Then, the
laser beam 26 passes through the resin of the diaphragm 23 and is absorbed by the resin of the
second frame to heat and melt the resin there, so that the resins are welded at the contact
portion of the two resins. [Selected figure] Figure 1
Method of manufacturing electroacoustic transducer
The present invention relates to a method of manufacturing an electroacoustic transducer such
as a small speaker, a multifunctional speaker, a buzzer, a receiver, a microphone or the like used
for a mobile communication device or the like. 2. Description of the Related Art In recent years, a
thin, high-performance electro-acoustic transducer has been widely used as an acoustic device
for mobile communication devices such as mobile phones. An example of such a conventional
electroacoustic transducer will be described based on the drawings. FIG. 6 is a cross-sectional
view of an electrodynamic speaker which is a conventional electro-acoustic transducer, and FIGS.
7, 8 and 9 are exploded cross-sectional views showing a method of assembling the speaker. First,
the configuration of this speaker will be described. In FIG. 6, 51 is a first frame assembly, 52 is a
second frame assembly, and the frame of the speaker is a combination of the first frame
assembly 51 and the second frame assembly 52. Here, the configuration of the first frame
assembly 51 will be described. Reference numeral 61 denotes a first frame which is a
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substantially annular molded article made of a black heat-resistant resin, a liquid crystal polymer
or the like. On the outer periphery of the first frame 61, a ridge portion 61a which is a fitting
portion with a second frame described later is formed. In addition, a flat portion 61b is formed
on the outer side of the protruding portion 61a to abut the end of the second frame. A flanged
disc-shaped yoke 62 is formed of a magnetic material and embedded in the first frame 61.
Reference numeral 63 denotes a disk-like permanent magnet which is magnetized in the vertical
direction and joined to the yoke 62. Reference numeral 64 denotes a disk-like top plate made of a
magnetic material bonded to the upper surface of the permanent magnet 63. From the bottom of
the yoke 62, through the permanent magnet 63 and the top plate 64, a magnetic circuit which
crosses the magnetic gap g which is a gap with the upper end of the yoke 62 is formed to return
to the bottom of the yoke 62. Next, the configuration of the second frame assembly 52 will be
described. Reference numeral 71 denotes a second frame as a diaphragm support ring which is a
substantially annular resin molded product made of the same material as the first frame 61. The
second frame 71 is formed with an upper portion 71a and a lower portion 71b having an inner
wall surface fitted with the ridge portion 61a of the first frame 61, and the lower end cross
section of the first frame 61 is sharp. It is deformed by welding with the flat portion 61b.
Reference numeral 72 denotes a pair of lead frames embedded in the second frame 71, and one
end of the lead frame 72 is exposed to the outer periphery and horizontally drawn, and then bent
at a right angle to the first frame 61 side.
The reference numeral 73 denotes a diaphragm of a film-like resin molded product made of
polyimide, polyetherimide or the like whose outer peripheral portion is adhesively fixed to the
lower portion 71b of the second frame 71. ~ 38 μm. 74 is a voice coil as an excitation coil
adhesively fixed to the lower surface of the diaphragm 73, and an annular air core obtained by
aligning and winding a coil winding, which is an enameled copper wire, into a rectangular crosssection It is a coil. The winding terminal 74a of the voice coil 74 is drawn from the upper end of
the voice coil 74 along the diaphragm 73 toward the outer periphery, and is soldered to the lead
frame 72 through a notch (not shown) of the second frame 71. . Reference numeral 75 denotes a
protector for preventing damage to the diaphragm 73 adhesively fixed to the upper portion 71a
of the second frame 71, and has a plurality of sound output holes. Next, a method of
manufacturing the speaker will be described with reference to FIGS. First, the first frame
assembly 51 and the second frame assembly 52 are assembled in advance. As shown in FIG. 7, in
the first frame assembly 51, the permanent magnet 63 (step 1) and the top plate 64 (step 2) are
attached to the yoke 62 already embedded in the first frame 61. It laminates in order and
adheres and fixes it, and is completed. Although the second frame assembly 52 is shown in FIG.
8, a voice coil 74 is formed in advance using a coil winding machine, the voice coil 74 is removed
from the core of the winding machine, and the diaphragm 73 is Bond (step 3). An adhesive is
applied to the lower portion 71b which is the receiving surface of the diaphragm 73 of the
second frame 71 in which the lead frame 72 is embedded, and the outer peripheral edge of the
diaphragm 73 is adhered and fixed (step 4). Next, the coil terminal 74a is wound around the lead
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frame 72 and soldered. Finally, an adhesive is applied to the upper portion 71a of the second
frame 71, and the protector 75 is adhered and fixed (step 5). Next, as shown in FIG. 9, the lower
portion 71 b of the second frame assembly 52 is fitted to the projecting portion 61 a of the first
frame assembly 51 (step {circle over (6)}), The abutting surface 61b of the second frame 71 is
abutted against the lower end portion of the second frame 71 and fixed by ultrasonic welding.
The voice coil 74 faces in the magnetic gap g, and when an audio signal is input to the voice coil
74 of the speaker, the diaphragm 73 vibrates up and down to emit a sound according to
Fleming's left-hand rule.
[0011] However, in the conventional speaker of such a configuration, in bonding the second
frame 71 and the diaphragm 73, the second frame 71, which is the receiving surface of the
diaphragm 73, is It is difficult to control the adhesive application amount to the lower portion
71b so as to be even over the entire circumference, and the adhesive tends to stick out, stringing,
or dripping off. In addition, during this bonding process, generation of unbonded portions and
deformation of the diaphragm tend to occur due to insufficient pressure. Although adhesives of
rubber-based, acrylic-based, epoxy-based, etc. have been used, these adhesives may have an
adverse effect on the environment. Furthermore, in ultrasonic welding of the first frame 61 and
the second frame 71, since it is necessary to generate frictional heat between both members, the
fitting portion between the first frame 61 and the second frame 71 is appropriate. It is necessary
to provide a proper clearance, and as a result, the center position of the first frame 61 and the
second frame 71 after assembly is shifted, and the voice coil 74 is accurately disposed in the gap
between the top plate 64 and the yoke 62. Was difficult. The present invention has been made to
solve such conventional problems, and its object is to use electro-acoustics to join parts with a
laser beam instead of adhesive or ultrasonic welding. It is an object of the present invention to
provide a method of manufacturing a transducer. The means of the present invention for
achieving the above object comprises a yoke fixed to a frame, a permanent magnet fixed to the
yoke, and a top plate fixed to the permanent magnet. A method of manufacturing an
electroacoustic transducer comprising: a diaphragm fixed to the frame; and an excitation coil
fixed to the diaphragm or the protector, the vibration comprising a plastic film in an outer
peripheral step portion of the frame consisting of plastics. A contact portion between the frame
and the diaphragm is welded by mounting the peripheral portion of the plate in an overlapping
manner and irradiating a laser beam along the flat portion of the diaphragm. Further, the frame
made of plastics is composed of two bodies of a first frame and a second frame, and the flat
portions provided on the first frame and the second frame to be in contact with each other are
brought into contact with each other. The contact portion between the first frame and the second
frame is welded by irradiating a laser beam from any one of the frames along the flat portion
after mounting.
[0015] Further, at a plurality of locations of the outer circumferential step portion of the frame,
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widening portions where the width of the outer circumferential step portion is widened are
provided. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the
present invention will be described in detail based on the drawings. FIG. 1 is a partially enlarged
sectional view showing a method of joining a frame of a speaker according to an embodiment of
the present invention and a diaphragm, FIG. 2 is a partially enlarged sectional view showing a
method of joining the frames similarly, These are the parts expanded sectional view of the
speaker which shows these junction parts. FIG. 4 is a partially enlarged perspective view showing
the joint portion of the second frame. First, the configuration of an electrodynamic speaker
according to an embodiment of the present invention will be described. In addition, in describing,
it is substantially the same as the structure of the conventional speaker, and abbreviate | omits
the description of the overlapping part. In FIG. 3, 1 is a first frame assembly, 2 is a second frame
assembly, and the speaker combines the first frame assembly 1 and the second frame assembly
2. 11 is a first frame made of plastics in which a magnetic circuit portion consisting of a yoke, a
permanent magnet, and a top plate is incorporated, and a protruding cylindrical portion 11a is
formed on the outer periphery, and A thin-walled collar portion 11c having a flat surface portion
11b which is a receiving surface of two frames is formed. An upper part 21a and a lower part
21b are formed on the outer periphery of a second frame 21 made of plastics, and the lower end
21c is flat. Reference numeral 23 denotes a diaphragm made of a plastic film to which a voice
coil 24 (not shown) is adhered. A flat peripheral portion 23a is welded to the lower portion 21b.
The first frame 11 and the second frame 21 are engaged with each other by the ridge portion
11a and the lower portion 21b, and the lower end portion 21c of the second frame 21 abuts on
the flat portion 11b of the first frame 11 Welding is performed by the laser beam at the contact
point. The other configuration is the same as that of the prior art, so the same components are
denoted by the same names and the description will be omitted. Next, a method of assembling
the speaker of the present embodiment will be described. Although the entire assembly
procedure is the same as in the prior art, the method of fixing the diaphragm 23 to the second
frame 21 and the method of combining the first frame assembly 1 and the second frame
assembly 2 are different. First, the fixing operation of the diaphragm 23 will be described with
reference to FIG. In FIG. 1, reference numeral 26 denotes a laser beam, which has been adjusted
in advance by experiment to have its intensity and focal length.
The peripheral portion 23a of the diaphragm 23 is placed on the lower portion 21b of the
second frame 21 turned upside down so that the voice coil 24 side faces upward, and the outer
periphery is held in close contact by a jig and held. Next, the laser beam 26 is irradiated from
above along the peripheral portion 23 a of the diaphragm 23. Thus, the contact portion between
the diaphragm 23 and the second frame 21 is welded. Next, an operation of fixing the first frame
assembly 1 and the second frame assembly 2 will be described with reference to FIG. The second
frame assembly 2 is turned upside down, and the lower portion 21b of the second frame 21 is
directed upward and set in an assembly jig (not shown). Next, the first frame assembly 1 is
turned upside down, and the ridges 11a of the first frame 11 are fitted to the lower portion 21b
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of the second frame 21 so that the flat portion 11b of the first frame 11 and The lower end
portion 21 c of the second frame 21 is in close contact. Next, the laser beam 26 is irradiated
from above along the ridge 11c. The contact part of the 1st flame | frame 11 and the 2nd flame |
frame 21 is welded by this. Next, the operation and effect of the present embodiment will be
described. In the case of welding at two places by the laser beam 26, the focal point of the laser
beam 26 is adjusted so that the resin member on the beam side functions as a laser transmitting
resin and the other member functions as a laser absorbing resin. Both are joined by the heat of
fusion of the laser absorbing resin. Here, since the thickness of the diaphragm 23 and the ridge
portion 11 c of the first frame 11 is thin, it is easy to transmit the laser. Further, since the laser
beam 26 is joined, the fitting portion between the first frame 11 and the second frame 21 does
not require a clearance, and a fitting portion (light press fitting) without a gap can be provided.
Therefore, the position of the voice coil 24 with respect to the magnetic gap g is accurately
determined. As an advantage of not requiring an adhesive, since the bonding work can be greatly
shortened and inlined, the yield can be improved and the cost can be reduced. There is no need
to manage organic solvents and troublesome adhesives, and there is no need to worry about
adverse effects on the environment. In addition, there is no stringing or dropping of the adhesive,
and the quality can be improved. In the embodiment of the present invention, the first frame 11
is provided with the ridge portion 11 c which is a thin portion, and the laser beam 26 is
irradiated from the first frame 11 side. The unit may be provided on the second frame 21 side,
and irradiation may be performed from the second frame 21 side.
Also, although the speaker in which two frames are configured has been described, it is a matter
of course that the method of fixing the diaphragm is also applicable to a one-frame type speaker.
Further, as shown in the second frame 21 of FIG. 4, the bonding area is increased by providing
the widened portions 21 d whose width is partially widened in the lower portion 21 b to which
the diaphragm is joined, and the bonding strength is increased. Is effective. FIG. 5 is an enlarged
sectional view of an essential part of another speaker which is an electroacoustic transducer. This
speaker is different from the embodiment of the present invention described above only in the
place where the peripheral portion 23a of the diaphragm 23 is joined to the upper portion of the
second frame 21. Therefore, although the detailed description is omitted, it is needless to say that
the present invention can be applied to such an electroacoustic transducer. As described above,
according to the present invention, the yoke fixed to the frame, the permanent magnet fixed to
the yoke, the top plate fixed to the permanent magnet, and the frame fixed to the frame In a
method of manufacturing an electroacoustic transducer comprising a vibrating plate and an
excitation coil fixed to the vibrating plate, the peripheral portion of the vibrating plate made of a
plastic film is superimposed on the step portion of the frame made of plastic and mounted. Since
the contact portion between the diaphragm and the frame is welded by irradiating the laser beam
from above along the flat portion, the bonding operation can be significantly shortened and the
in-line can be achieved. Improve costs and reduce costs. There is no need to manage organic
solvents or troublesome adhesives, and there is no risk of adverse effects on the environment. In
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addition, there is no stringing or dripping of the adhesive, and the positional accuracy of the
exciting coil is improved to improve the quality. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1
is a cross-sectional view showing a method of bonding a diaphragm of a speaker according to an
embodiment of the present invention. FIG. 2 is a cross-sectional view showing a method of
bonding two assemblies of a speaker according to an embodiment of the present invention. FIG. 3
is a partially enlarged cross-sectional view showing a configuration of a speaker according to an
embodiment of the present invention. FIG. 4 is a partially enlarged perspective view showing a
configuration of a speaker according to an embodiment of the present invention. FIG. 5 is a
partially enlarged cross-sectional view of a speaker according to another embodiment of the
present invention. FIG. 6 is a cross-sectional view showing a configuration of a conventional
speaker. 7 is an exploded cross-sectional view showing an assembly process of the speaker of
FIG. 6; FIG. 8 is an exploded cross-sectional view showing an assembly process of the speaker of
FIG. 6; FIG. 9 is an exploded cross-sectional view showing an assembly process of the speaker of
FIG. 6;
Explanation of the code 1 1st frame assembly 2 2nd frame assembly 10 speaker (electro-acoustic
transducer) 11 1st frame 11a projecting part 11b butting surface 11c ridge 12 yoke 13
permanent magnet 14 top plate 21 Two frames 21d Widening part 23 Diaphragm 23a
Peripheral part 24 Voice coil (excitation coil) 26 Laser beam
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