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JPH0383493

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DESCRIPTION JPH0383493
[0001]
TECHNICAL FIELD The present invention relates to a method of manufacturing a flat diaphragm
for a speaker used for various sound * a devices. PRIOR ART A conventional method of
manufacturing a flat diaphragm for a speaker is shown in FIG. In FIG. 4a, 11 is a surface material
of aluminum foil, 12 is a core material of aluminum foil formed in a honeycomb structure, and
13 is a film-like adhesive for bonding surface material 11 and answer material 12. In the
conventional manufacturing method, the surface material 11, the core material 12 and the
adhesive 13 which have been punched into a predetermined shape are stacked and heat-pressed
to form a sandwich structure as shown in FIG. 4 as a sandwich structure. It was Problem to be
solved by the Invention In the conventional method of manufacturing a flat diaphragm for a
speaker, the surface material 11. Core material 12. The film adhesive 13 was pressed out into a
predetermined shape, laminated and heat pressed to form a flat plate diaphragm, but by pressing
out the core 12 of the honeycomb structure into a circle, the outer peripheral portion of the
aluminum foil was deformed and the surface was Even when the material 11 and the core
material 12 are laminated and heat-pressed with the film adhesive 13, the outer peripheral
portion of the core material 12 is deformed (doughened) and the surface material 11 and the
core material 12 are uniformly bonded. In addition, there is a defect that an adhesion failure
occurs and an abnormal sound is generated by vibration to increase harmonic distortion. Also, in
the conventional manufacturing method, a surface material which has been pressed and
processed into a predetermined shape in advance 11. Core material 12. Since the film adhesive
13 is laminated and heat-bonded one by one to form a diaphragm, the productivity is low and the
diaphragm becomes an expensive diaphragm. Furthermore, since the apparent density of the
core material 12 is extremely small, the honeycomb flat plate made of the conventional
aluminum foil surface material 11 and the core material 12 formed of the aluminum foil in a
hanica structure has a very small thickness. To be used, and to use a material with high rigidity
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as the surface material 11, there is an advantage that the specific elastic modulus E (ci / 5ec2),
which is one of the important physical properties as a diaphragm compared to the conventional
valve cone paper, is increased. Since the internal loss of the diaphragm itself is extremely small,
the high-frequency resonance is sharpened, which limits the usable reproduction band. The
present invention is intended to eliminate the above-mentioned conventional drawbacks and to
provide a high-quality, high-quality, flat-panel loudspeaker having a high internal loss. Means for
Solving the Problems In order to solve the above-mentioned problems, the present invention uses
a core sheet made of aluminum foil as a core material in a honeycomb structure using a
laminated mica sheet having a smaller density and a higher internal loss than an aluminum foil
as a surface material. Material is laminated and heat-bonded with a thermoplastic unidentifiable
cloth-like polyamide adhesive to form a flat plate of sandwich structure with the top and bottom
of the core of honeycomb structure of aluminum foil as the surface material of laminated mica
sheet and cooling press After correcting the warpage, it is cut into a predetermined shape by a
spindle cutter to obtain a flat diaphragm.
By the above method, it becomes a flat diaphragm which has high internal loss and does not
sharpen high-frequency resonance compared to the conventional flat diaphragm for a speaker,
and after laminating and heat-bonding in a predetermined flat shape, it is formed into a
predetermined shape by a spindle cutter. Since the cutting is performed, it is possible to obtain
an inexpensive and stable speaker flat plate diaphragm. Embodiments Hereinafter, one
embodiment of the present invention will be described with reference to the attached drawings.
First, in FIG. 1, FIG. 1 ad illustrates the process of manufacturing the flat diaphragm of the
present invention. In a of FIG. 1, 1 is 30 to 401. The surface material of the laminated mica sheet
of zm, 2 is an invisible cloth-like thermoplastic polyamide adhesive sheet, 3 is a core material
formed into a honeycomb structure with an aluminum foil. As an invisible cloth-like
thermoplastic polyamide adhesive, Konishi (brand name of iron bond main component polyamide
resin of a stock, an invisible cloth-like sheet with a date of 30 g / A can be used. The core
material 3 is made of Yokohama rubber (a high-pex core made of straw) having a 1/8 inch cell
size of aluminum with a foil thickness of 17 to 18 μm and a honeycomb core with a thickness of
1.3 to 1.51. The manufacturing process will be described below. The core material (honeycomb
core) 3 is cut into a predetermined size. In the embodiment, it is cut into a size of 180 nm × 180
mm in relation to the stage of the press. The core material 3 is immersed in a primer solution
mainly composed of a chlorinated olefin to perform a primer treatment to improve the adhesion
between the core material 3 and the surface material 1. After immersion, take out and perform
normal temperature drying. Konishi P as a primer solution. A P (polypropylene) primer P-80 was
used. The core material 3 and the surface material 1 are adhered to each other by the
thermoplastic invisible cloth-like polyamide adhesive sheet 2, and as shown in FIG. 1, the
adhesive material and the surface material 1 are overlapped on the top and bottom of the core
material 3 Mold temperature 200 ~ 210 ° C, press pressure 5 kg / c ++! , Heat and pressure
bonding under the conditions of pressing time of 50 to 60 seconds. After the heat and pressure
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bonding, a cooling press is carried out to eliminate internal distortion to prevent warpage. A flat
plate 4 obtained by laminating and bonding the core material 3 and the surface material 1 shown
in FIG. 1 in a sandwich structure with an adhesive 2 is obtained in this manner. Next, in order to
cut it to a predetermined outer diameter size, it is cut by a spindle cutter as shown in the
sectional view of FIG. 2 to obtain a flat diaphragm 5. FIG. 1 shows a flat diaphragm 5 cut to an
outer diameter of φ 281 by a spindle cutter. FIG. 1C is a flat plate 4 of a sandwich structure cut
and cut out by a spindle cutter.
As a cutting method by the spindle cutter, FIG. 2 shows a cross-sectional view of the spindle
cutter. The material used is 5 KD-11 die steel. In FIG. 2, 6 is a payout bar and 7 is a spring. The
inner diameter of the blade 8 corresponds to the outer diameter of the vibrating plate, and in the
embodiment, the outer diameter of the vibrating plate is φ281, which is φ28 in FIG. The spindle
cutter is mounted on a drilling machine, and the spindle cutter is rotated at a rotational speed of
540 rpm to obtain a flat diaphragm in the process of FIG. Since the flat plate 5 cut out while
rotating the delivery rod 6 in FIG. 2 remains in the cutter 8 5 to 7 pieces are cut and then the
rotation of the spindle cutter is stopped and the flat plate vibration cut by lowering the delivery
rod 6 and cut. It is for taking out the board 5. In the flat diaphragm for a speaker of the present
invention obtained by the above method, the bonding between the core material 3 and the
surface material 1 is first performed after bonding the surface material 1 and the core material 3
first and then cutting with a spindle cutter. There is no defect and a stable product is obtained. In
the conventional case, the core of the aluminum foil honeycomb structure is punched out and the
outer peripheral portion is deformed to cause darrell to cause incomplete bonding in bonding
with the surface material, generating abnormal noise due to vibration and generating harmonic
distortion. There was a drawback of increasing it. In the conventional example, the core material
/ surface material adhesive punched to φ 28 m 5 is laminated and heat bonded one by one to
form a flat diaphragm, but in the embodiment of the present invention, It can take ~ 26 pieces
and it is cheaper than before. Table 1 shows physical characteristics of the speaker flat
diaphragms of the conventional example and the embodiment of the present invention. In the
embodiment of the present invention, the use of an integrated mica sheet as the surface material
1 and the thermoplastic polyamide adhesive more flexible than the thermosetting epoxy-based
adhesive as the adhesive between the core material 3 and the surface material 1 Although the
specific elastic modulus E is slightly inferior to that of the conventional one by adopting the sheet
2, it is lightweight and the internal loss is high, and the peak of the high frequency resonance is
also low as shown in FIG. There is an effect that can be done. In FIG. 3, the solid line represents
the sound pressure frequency characteristic of the flat speaker of effective diameter φ 28 m 5
according to the flat diaphragm for a speaker of the present invention, and the dotted line is a
conventional example. As described above, according to the method of manufacturing a flat
diaphragm for a speaker of the present invention, the internal loss is high and the high frequency
resonance is not sharpened, and after laminating and pressure bonding the surface material and
the core material, the spindle cutter is used. It is possible to provide a product that is rich in
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productivity, inexpensive and stable in quality, and has great industrial value.
[0002]
Brief description of the drawings
[0003]
1a to 1d are perspective views showing a process of manufacturing a flat plate diaphragm for a
loudspeaker according to an embodiment of the present invention, FIG. 2 is a sectional view of a
spindle cutter, and FIG. The characteristic view which shows the sound pressure frequency
characteristic of the speaker which used the flat diaphragm, FIG. 4 a.
b is a perspective view which shows the process of the manufacturing method of the
conventional flat diaphragm for speakers. 1 ...... surface material, 2 ...... non 識布 like polyamide
adhesive sheet, 3 ...... core, 4 ...... flat, 5 ... · · Flat diaphragm.
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