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JPS60198

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DESCRIPTION JPS60198
[0001]
The present invention relates to a method of combining an edge of a speaker diaphragm with a
gasket for holding the edge of the speaker diaphragm. -) Prior art As shown in Fig. 1, the edge of
the speaker diaphragm is connected to the gasket by attaching the adhesive (4) to the outer
peripheral portion of the collar 17 (2) bonded around the diaphragm (1). The frame (3) is coated
with the outer peripheral portion C and the adhesive (5) is applied on the outer peripheral
portion of the edge (4) and the exposed frame (3). (To 611: after bonding these adhesives (4) and
(5) were done to dry and solidify (: depending on: As the bonding (; adhesive (4 part 5) used
here), a paste-like adhesive in which a resin such as a rubber or acrylic resin is dissolved in a
solvent is generally used. Such solvent-based adhesives cause the solvent to evaporate and
scatter, and as a result, the solid content is assimilated from C2 to generate adhesion. However,
adhesion using such solvent-based adhesives has many disadvantages. That is, (1) many steps of
uniform application, adhesion, and drying of the adhesive are required, and particularly the
drying step (two hours are required, and the mass productivity can be improved and the cost is
increased. (2) The problem of pollution is large because solvents are used. (3) Due to the "spill
out" of the solvent, deformation or deterioration of the edge or contamination on the appearance
occurs. (4) Partial adhesion unevenness tends to occur, and the quality of adhesion is unstable.
Etc. have many drawbacks. (C) Purpose of the Invention The present invention is made in view of
the above problems, and can be processed in a very short time, can be mass-produced easily, can
improve the working environment, can stabilize the quality of bonding, etc. It is an object of the
present invention to provide a method of coupling an edge of a speaker diaphragm and a gasket,
which has an advantage. The present invention relates to a method of combining an edge and a
gasket of a speaker ball moving plate according to the present invention, in which an annular
gasget made of a thermoplastic resin is superimposed on the edge of a speaker retracting plate
mounted on the outer periphery of a frame. Then, the overlapping portion (= applying ultrasonic
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energy to melt the resin of the overlapping portion, and bonding the edge of the diaphragm and
the gasket to each other.-) Example $ 2 The bonding method of the present invention shown in
FIG. 2 shows the main part of the speaker. In FIG. I, (7) is an annular member made of a
thermoplastic resin fixed to the outer peripheral portion of the frame (3), and the annular portion
@ (3) upper surface (− edge of diaphragm (1) The lower surface of the outer periphery of 2) is
ultrasonically welded.
(8) is a gasket made of thermoplastic resin, and is a lower surface of the gasget (8), and a part of
the outer peripheral upper surface of the edge (2) of the diaphragm (1) and the upper surface of
the annular member (3) Is ultrasonically welded. That is, the present invention is made by
focusing attention on the fact that ultrasonic energy softens and melts the thermoplastic resin
relatively easily, and the gasket (8) made of this thermoplastic resin is directly vibrated (1)
Binding to the edge (2) of Fig. 6 (al 1 al + 1) 11. One Example of Implementation of the Invention
Method First, in FIG. 3 (=, ISI is the speaker main body, and the damper (1 (a voice coil bobbin
(111 is inserted) is disposed in the magnetic gap of the magnetic circuit (9) coupled to the frame
(3) The center hole of the diaphragm (1) is inserted into the upper end of the voice coil bobbin
0υ, and the outer periphery C of the diaphragm (1): edge (2) made of bonded cloth or
polyurethane frame (3 (2) It is in a state of being superimposed on an annular member (7) made
of, for example, polypropylene which is a thermoplastic resin fixed to two. In addition, as a fixing
means to the frame (3) outer peripheral part of the above-mentioned annular member (7), a
plurality of projections (71) ... which were projected downward from this annular member (5) ...
outer peripheral part of frame (3) (: Inserted into a plurality of provided small holes, the tip of
each projection (71) · ° ° is crimped coupling is adopted. On the other hand, a2 is an ultrasonic
oscillator, which drives the ultrasonic transducer o3. {Circle around (2)} This ultrasonic
transducer a cries: A tool horn connected via a fixed horn a country, the annular tip end of which
is arranged opposite to an annular jig crying, this jig αe and the tool horn An outer peripheral
portion of the speaker (81 is disposed between the terminal I and I). (17) is a lowering
mechanism for lowering the vibrator (one-input fixed horn α 9 and the tool horn a 4 to the jig
(161 side). The descent mechanism Oe is operated to overlap the tool horn r141 and jig (161)
with the edge (2) of the diaphragm (1) and the annular member (7) on the outer peripheral part
of the frame (3). After clamping and pressing, the ultrasonic oscillator 2 is operated to fix the
ultrasonic energy from the vibrator α3 to the fixed horn (19, bonding the work Fuji (2) and the
annular member (7) through the tool horn 顛Then, the polypropylene of the annular member in
the vicinity of the joint surface is melted, whereby part of the molten resin is impregnated into
the cloth or polyurethane of the edge (2). Next, the melting point is rapidly cooled and solidified
by stopping the oscillation of the oscillator a3, and the overlapping portion of the edge (2) and
the annular member (7) is strongly joined (: joined).
Next, as shown in FIG. 3 (bl, as shown in bl), the tool carrier horn t141 is raised to form the
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annular gasget (8) made of polypropylene as in the case of the annular member (7) at the edge
(2) of the diaphragm (1) and The upper surface of the exposed annular member (7) (: mount and
lower the tool horn 11 again), the IL tool horn 11 and the jig shout, the gasket (8) and the
diaphragm (IJ edge (2 ) And sandwiching pressure where it overlaps with the annular member
(7). Then, in this state, the ultrasonic energy is applied to the overlapping portion I, so that the
polypropylene of the gasket (8) in the vicinity of the joint surface and the polypropylene of the
annular member (7) melt again, While the two wave landing bodies (71 (8) are integrated, a part
of the molten resin of the gasket (8) is impregnated into the edge (2), and then the application of
the ultrasonic energy is stopped 1: Next, the overlapping portion between the edge (2) and the
gasket (8) is strong (two joints are made). At this time, the welding time of the ultrasonic wave
required to melt the resin is usually 16 seconds (in the case of a speaker with a diameter of 600
m, the vibration output of 600 W is usually within 5 seconds at the longest and also). The time
(holding time) required to stop the oscillation and cool and solidify the molten resin is also 2-3
seconds, and the processing time is extremely short. In addition, the sliding movement of dust,
oil, etc. adhering to the surfaces of the adherend (2), the annular member (7) and the gasket (8)
is shaken off by ultrasonic waves, so it is possible to use an adhesive At the time of bonding (the
required pretreatment of the bonding surface is unnecessary. Bonding the adherend (2) (71 or
(8) by squeezing (2, tool horn 2) by crimping to the adherend (2) (71 or (8) and then oscillating
(oscillation after processing) Since it can be joined with high accuracy and heat is not generated
except at the welded portion, there is an advantage that there is no deformation or deterioration
of the product. The oscillation frequency is usually 15 to 25 KHz. As a material of the tool horn
(141, aluminum, iron, titanium or the like is suitable. On the other hand, as means for fixing the
frame (3) to the annular member (7), besides the caulking as described above, screwing and
integral molding with the frame (3) by injection molding of the annular member (7) , Etc., but in
the case of the above-mentioned caulking bonding, the knee can utilize the apparatus shown in
FIG. That is, as shown in FIG. 4, the small holes C311 provided in the outer peripheral portion of
the frame 3 with a plurality of projections (71) protruding downward C from the annular
member (7) (: inserted state The ultrasonic energy is applied from the tool horn I by clamping
and pressing it between the concave portion (a jig provided for 1 second (161 and the tool horn
1).
This causes the contact points between the projections (71) ... of the annular member (7) where
the ultrasonic energy is concentrated and the jig (the recess of the jig 161 to be melted, and the
projections (合 致71) The head of ... is formed, and the outer peripheral part of the frame (3) and
the annular member (7) are strongly fixed. (E) Effects of the Invention As is apparent from the
above description, the method of combining the edge and the tongue of the speaker diaphragm
according to the present invention, the heat of the outer peripheral portion of the frame (; on the
edge of the mounted speaker diaphragm Since annular gasgets made of a plastic resin are
superposed ((-because ultrasonic energy is applied to fuse the edge to the gasket, (1) the working
time is extremely short, the productivity is high and the cost is reduced) It can be done. (2) There
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is no generation of harmful gas and there is no concern about pollution. (3) There is no heat
generation other than the fusion bonded part and there is no deformation or deterioration of the
product. (4) It has many advantages, such as being able to fuse uniformly over the entire
circumference of the edge and achieving stable quality.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view showing the connection between the edge of the speaker
diaphragm and the gasket in the prior art, and FIG. 2 is a cross-sectional view showing the
connection between the edge and the gasket of the speaker diaphragm of the present invention.
3 figures (!
L), (1) 1 is a cross sectional view showing one embodiment of the method of the present
invention in the order of steps, and FIG. 4 is a cross sectional view of the main part of the method
1 of the present invention. (1) ... diaphragm, (2) ... end, (3) ... frame, (7) ... annular member, (8) ...
gasket, 0 ... ultrasonic vibration Child, α4 ... tool horn, shout ... jig. Fig. 4 Fig. 3 (G)
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