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■ Cone-type loudspeaker manufacturing method 特 願 Japanese Patent Application No. 41-645
[Phase] Application No. 41 (1966) January 5 Referee Akira 42-7923 @ inventor Hashimoto
President Osaka Prefecture Osaka District Omiya Nishinomachi 5 32 2 Osaka Acoustics Co., Ltd.
0 Applicant Osaka Acoustics Co., Ltd. [Phase] Agent Attorney Saita
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a cone type loudspeaker,
FIG. 2 is a sectional view of an adhesive melting pump, and FIG. 3 is a detailed explanatory view
of a method of the present invention.
DETAILED DESCRIPTION OF THE INVENTION The present invention locally preheats the metal
material to be bonded in the assembly process of the cone type loudspeaker, selects an adhesive
suitable for the process, and utilizes its characteristics in a short time The present invention
relates to a manufacturing method for obtaining a highly stable product. In the conventional
loudspeaker assembling method, the frame 3 is attached to the magnetic circuit 2 having the
annular magnetic gap 1, and the frame 3, the damper 4, the voice coil 5, and the cone paper 6
are adhesively assembled by the adhesive at the following locations. . ■ Voice coil 5 bobbin 26
upper end 7-damper 4 inner edge 8 ■ frame 3-damper 4 outer edge 9 ■ voice coil 5 bobbin 26
upper end? --- Cone paper 6 top 10 ■ frame 3 outer edge upper part 11-cone paper 6 outer
edge 12 ° and using a nitrile rubber type or acetal type material diluted with a solvent for the
adhesive, by the [111111] natural drying method Bonding by solidification of the adhesive in the
case of natural evaporation of the solvent. However, this method takes 2-3 days for the solvent to
evaporate, and the adhesive is chemically unstable at ordinary temperature, and the adhesion
due to the subsequent partial evaporation of the solvent remaining in the adhesive Anomalous
internal stress is generated in the non-rigid voice coil 5, damper 4 and cone paper 6 of the
adherend due to uneven volume change of the agent, which causes eccentricity, gap deviation,
flicker, etc. of the loudspeaker. It was the cause of the failure. In addition, if the temperature is
raised to a certain limit in order to shorten the drying time of the adhesive during this process,
the adhesive foams and adheres as it is due to the rapid evaporation of the solvent due to the
nature of the solvent dilution type adhesive. Because the adhesive strength is significantly
reduced and the entire loudspeaker is heated in the dryer, the parts with large heat capacity such
as the magnet 23, the yoke 24, the pole 25 and the like are also heated and then lowered
simultaneously. Because The thermal and temporal losses during that time are extremely large.
The present invention is a manufacturing method in which the above-mentioned drawbacks are
improved in the adhesion of the frame 3 which is a metal material to the cone paper 6 or the
damper 4 among the above-mentioned conventional methods, and its main features are: Use of
thermoplastic adhesive in molten state. (2) The heating was adopted by the local indirect heating
method by high frequency current. The point is that the time and heat required for the bonding
process are significantly reduced. That is, after the thermoplastic adhesive 13 (polyethylenebased) is charged into the heating tank 14 (110 to 130 ° C.) and melted, the adhesive in a
molten state is pressure-fed out from the nozzle 16 by the gear pump 15.
The heating high frequency coil 18 is positioned closer to the outside of the damper 4 outer edge
9 bonding portion of the frame 3 than the outside, and locally locally heats the turn portion from
the outer surface 7 at the same time. [111111] EndPage: The part 11 is heated from the back
side to locally raise the temperature of only the bonded portion of the frame 3 which is the metal
material to be bonded to about 110 ° C. Then, the voice coil holding jig 20 into which the voice
coil 5 is inserted is inserted into the magnetic circuit center pole 25 and then the damper 4 is
inserted, and its outer edge 9 (adhesion portion with the frame 3) The adhesive 13 melted from
the nozzle 16 is press-coated on the inner edge 8 (voice coil bobbin upper end portion) and the
frame 3 outer edge upper portion 11 (corn paper outer edge bonded portion). Then, the cone
paper 6 is dropped into the voice coil holding jig 20 by inserting the top 10 holes into the voice
coil holding jig 20 to lighten the outer edge 12 (press the adhesive to make sufficient adhesion,
and then melt the adhesive 13 on the outer edge 12) After painting, the arrow 22 is placed and
pressed from above. When this happens, the adhesive applied on the damper outer edge 9 passes
through the grain of the damper 4 and the outer periphery of the damper 4 adheres to the frame
3, and the outer edge 12 of the cone paper 6 Arrow 22 adheres on top of it. When the highfrequency current flowing to the high-frequency heating coil 18.19 is cut, the temperature of
each bonding portion rapidly drops, and accordingly, the adhesive solidifies to complete the
bonding process. As described above, since the manufacturing method of the present invention
locally preheats only the bonding portion, the heat quantity required is small, and the
temperature can be freely controlled. Thus, a relatively compact high frequency heating device is
sufficient without the need for a large dryer to heat the entire speaker as in the prior art. Further,
the temperature rise and fall time is extremely short because the heat capacity of the heated
portion is small, and it is possible to shorten the bonding process significantly and reduce the
heat quantity. Furthermore, since the adhesive is thermoplastic and it is melted and used, there is
no need to dilute it with a solvent, so there is no foaming due to the solvent even at elevated
temperatures and there is no significant volume change ratio, so adhesion is The force is uniform
and strong. As the powder or granular solid adhesive, the powder or granular solid adhesive
sprayed on the upper surface of the adherend part in the process is not melted due to
temperature nonuniformity W1111111 due to temperature The time to become liquid is not
necessary in the present invention. Rather, the powdery or granular solid adhesive may be used
to bond the damper 4 inner edge 8 or like the voice coil 5 bobbin 26 upper end 7 to the damper
4 inner edge 8 or to bond the voice coil 5 bobbin 26 upper end 7 to the cone 6 top 10 The
present invention is applicable only to a portion where it does not fall into the funnel-like portion
of the top portion 10 of the cone paper 6 and is not likely to spill out, and adhesion of the frame
3 and the damper 4 or the frame 3 and the cone paper 6 In the case of adhesion between flat
parts as described above, a solid or powder solid adhesive is unsuitable because it drips on the
adhered part and falls off due to vibration and adheres to other unnecessary places.
In this respect, since the adhesive used in the present invention is a molten thermoplastic
adhesive as described above, even in the bonding of the flat portions, the application to the
bonded portion is stable due to the viscosity, and it is spilled out by vibration. Because there is no
risk of sticking to other parts, handling on the process is convenient. Second, since the adhesive
in the present invention has sufficient adhesive strength and can permanently retain chemical
stability at room temperature, the failure of the adhesive part of the loudspeaker is completely
eliminated, thus the product amplification. Effects that significantly increase the reliability of the
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