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JPS546524

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DESCRIPTION JPS546524
Description 1, title of the invention
Loudspeaker manufacturing method
3. Detailed Description of the Invention The present invention relates to a method of
manufacturing a speaker, and more particularly, to efficiently bond each of a flame stamper and
a heating frame to a cone. In general, as shown in FIG. 1, a cone-shaped speaker is a magnet (1),
a yoke (2), and a pole piece (3). Consisting of helical coil bobbin (4), voice coil (5), core (1), frame
(7), backing (8), damper (9), dust cap Ql, these parts are generally following Are assembled by
each process of (A voice coil bobbin (4) equipped with a voice coil (5) together with an Al gap
gauge jig is mounted on a pole piece (3) K). (B) Position the damper (9) at a predetermined
position, and bond the outer peripheral edge to the frame (7). (C) Bond the inner peripheral edge
of the damper (9) to the voice coil bobbin (4). (D) Position the cone (6) in place and glue its edge
to the frame (7). (E) Bond the inner peripheral edge of the cone (6) to the voice coil bobbin (4).
(F) After the adhesion is completed 7, the gap gauge jig is removed. (G) Bond the backing (8). (H)
Bond the dust cap αQ. Conventionally, solvent-based adhesives have been used for adhesion in
the above steps, but solvent-based adhesives require a long time to evaporate the solvent (2)
EndPage: 1 and the adhesive strength expression time is long. It took several hours to several
tens of hours to remove the gap gauge jig for positioning the coil bobbin at a predetermined
position. As this improvement measure, shortening of adhesion of each of (C) and (El steps has
been considered. That is, the application of a two-component rapid curing adhesive, a
cyanoacrylate adhesive, and a heat melting adhesive. However, it is clear that this is not a
fundamental solution if conventional solvent-based adhesives are used for the bonding of (B) and
(D). Conventionally, the application of a two-component rapid curing adhesive or a solvent-type
rubber-based adhesive has been considered for adhesion in each of the steps (B) and (D), but this
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has the following disadvantages. That is, in the case of the former, a mixing process of the two
liquids is required, and after the application, it must be adhered within the usable time, and the
curing time changes depending on the temperature and humidity of the atmosphere. In the latter
case, a solvent drying step is required, and during pressure bonding, the viscosity of the adhesive
is not sufficiently lowered, the wettability to the adherend is poor, and it is difficult to obtain
sufficient adhesive strength. (3) The present invention has been made focusing on the above
points, and in particular, the bonding of (B) and (DJ steps are completed in a very short time, and
as a hygienically safe one, It is an object of the present invention to provide a method of
manufacturing a low cost speaker suitable for mass production.
In the present invention, for the purpose described above, a heat melting adhesive is used
particularly for bonding in the & (Blt (D) steps. The details will be described below with reference
to FIGS. 2 and 3. In the present invention, the heat melting adhesive (11a) + (11b) is first applied
in the form of a string having a predetermined thickness and width to the bonding portions of
the frame and the damper and cone before entering into one assembly process. . The application
places the frame on the center of the turntable and secures the gun to a point on the adhesive
application of the frame. The method of setting the timer of the gun so as to discharge for the
time of one rotation of the turntable can be performed well. And, as shown in FIG. 2, the bonding
of the frame and the damper in the step (B) is performed by pressing the damper positioned at a
predetermined place to the frame by the heat (4) plate (13a). At this time, the heating plate (13a)
is heated by the heater (14a) to a temperature at which the viscosity of the adhesive becomes
600 bids or less, and the pressure bonding is performed until the bonding portion of the frame is
sufficiently heated. Also, as shown in FIG. 3, the adhesion between the frame and the cone in the
step (D) is performed by the hot plate (13b) having the heater (14b) for the cone positioned at a
predetermined position, as shown in FIG. Do the same as bonding. According to the experiment, a
hot-melt adhesive with a melt viscosity of 20 Boise at 20Qr :, and an ethylene-vinyl acetate
copolymer adhesive is applied in an amount of 1067 m to the bonding portion of the aluminum
die-cast frame with the damper and The damper molded with an impregnated cloth was crimped
for 1 minute with a pressure of 5QQg / an2 with a heat plate heated to 200 tl & c, removed the
heat plate, allowed to cool for 5 minutes, and then the center of the damper was pulled upward.
It was confirmed that the bond strength was sufficient. When the hot plate was removed, no
stringing of adhesive was observed at all. (5) It was also confirmed that sufficient adhesive
strength can not be obtained depending on the low temperature hot plate where the melt
viscosity of the adhesive is 600 poise or more, and stringing also occurs. According to the
present invention, as is apparent from the above, (11 bonding is completed quickly, the gap
gauge jig can be removed quickly, and the manufacturing time is significantly reduced. (2) One
working method is not limited because adhesion can be performed anytime after the adhesive
application. (3) A stable adhesion state can be obtained regardless of the atmosphere, so mass
production of high quality products becomes possible. (4) Since the adhesive does not contain a
solvent, the working environment can be kept clean.
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In addition, it is clear that these effects can be obtained also by applying the adhesive as the
damper and the cone side. Also, the adhesive does not necessarily have to be applied all around
the bonding portion.
4. Brief description of the drawings FIG. 1 is a sectional view showing the structure of a coneshaped speaker (6) EndPage: 2 FIG. 2 is a sectional view showing a bonding method of a frame
and a damper outer periphery according to the present invention, FIG. FIG. 2 is a cross-sectional
view showing a method of bonding a frame and a cone edge by the present invention sister. In
the figure, reference numeral (1) is magnet, +21 is yoke, (3) is pole piece, (4) is a voice coil
bobbin, (6) is a cone, (7) is a frame, (9) is a damper, (11a) , (11b) is an adhesive, H is a hot plate.
Agent Shinno-(1) Fig. 1 Fig. 2 End Page: 3
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