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JPS60176399

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DESCRIPTION JPS60176399
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
flat diaphragm for a speaker used in various acoustic devices. The structure of the conventional
example and its problems In the conventional bonding between the core and the front skin of the
flat diaphragm for a speaker, an ethylene vinyl acetate based film or a polyamide based film has
been used as an adhesive. Both adhesive films are good for workability, but are high in specific
gravity because they are hot melt type films, and also have low adhesive strength between the
core and the surface skin, so they lack reliability and sound pressure even from the viewpoint of
frequency characteristics. There is a drawback that the level (dB) is low and the high range can
not be extended. The adhesion process between the core and the surface skin will be briefly
described with reference to FIGS. 1 and 2. First, in FIG. 1, the surface skin material 1 and the
adhesive film 2 are superposed and adhered while heating and pressing between the upper
heating roll 3 and the lower heating roll 4. Finally, the sheet is taken up by the roll roll 5. Next, in
FIG. 2, the core 7 is inserted between the skin 8 to which the surface skin 1 and the adhesive film
2 are adhered, and the heater 6 prepared in advance at 200 ░ C. to 220 ░ C. By pressing for 15
seconds to 20 seconds, the core 7 and the skin 8 are bonded to obtain a flat diaphragm for a
speaker. SUMMARY OF THE INVENTION The present invention solves the above-mentioned
conventional drawbacks and is reliable in frequency characteristics by using an adhesive which
can lighten the adhesive and improve the adhesion. It is an object of the present invention to
provide a flat diaphragm for a speaker having a high sound pressure level (dB) and a high
frequency band extending. SUMMARY OF THE INVENTION In order to achieve the above object,
the present invention uses a nylon nonwoven as an adhesive between the core and the surface
skin. By using this nylon non-woven fabric, the work efficiency is good, the ratio M is / J и ?, the
adhesive strength is high, the reliability is high and the weight is low, and in the frequency
characteristics, the sound pressure level is increased, Thus, it is possible to obtain a flat
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diaphragm for a speaker in which the high region can be extended. DESCRIPTION OF THE
PREFERRED EMBODIMENT An embodiment of the flat diaphragm for a speaker according to the
present invention will be described below with reference to FIGS. FIG. 3 is an external view of the
nylon non-woven fabric 9 used as the adhesive of the present invention. Next, in FIG. 4, the
surface skin material 10 and the nylon non-woven fabric 9 are superposed, and the upper
heating roll 11 and the lower heating roll 12 are adhered while heating and pressing. Finally,
take-up is performed at take-up 90-13. Next, in FIG. 6, the core 15 is inserted between the skin
14 to which the surface skin 10 and the nylon non-woven fabric 9 are adhered, and the heater
16 prepared in advance at 2 ░ C. to 220 ░ C. By pressing for 15 seconds to 20 seconds, the
core 16 and the skin 14 are bonded to obtain a flat diaphragm for a speaker.
Next, the comparison between the product of the present invention and the conventional product
is shown. ? Specific gravity Conventional product Polyamide film 1 и ? 37 / crd Echire 4 Last
heat-based hot melt film 0.93 y / at 1 invention product Nylon-based non-woven fabric 0.5 to 0,
6 f! / CrdO core and surface skin bond strength Average value of n-10 (core material 2 surface
skin material is same aluminum, bonding condition 2 oo'c 15Sec) Conventional product 100200y this invention product 5o ?-700p or more Thus, the flat diaphragm for a speaker using
the nylon nonwoven fabric 9 of the present invention as an adhesive is highly reliable and light.
Effects of the Invention As described above, since the flat diaphragm for a speaker of the present
invention is configured, the adhesive strength between the core and the surface skin is high, and
the reliability can be high and the weight can be reduced. As a result, the magnet used in the field
section can be lowered by one rank, cost can be reduced, and the industrial value is great.
[0002]
Brief description of the drawings
[0003]
1 and 2 are manufacturing process diagrams using a conventional adhesive film for a speaker
flat plate, and FIG. 3 is an external view of a nylon non-woven fabric as an adhesive used for the
speaker flat plate diaphragm of the present invention, FIG. FIG. 5 is a manufacturing process
diagram of a flat diaphragm for a speaker using the nylon nonwoven fabric of the present
invention.
9 иии-Nylon non-woven fabric, 10 и и и Surface skin, 11 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и Reroll, 14 ииииии Skin, 15 иии Core и и и и и и и
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Name of agent Attorney Nakao Toshio One other person Figure 1? Figure 2 ?
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