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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
method for manufacturing a speaker diaphragm having a honeycomb structure, such as a
thermally activated adhesive, a ultrasonic wave-contacting speaker diaphragm, and a JtJ. [Prior
Art] Generally speaking, a speaker vibration #Ih plate V (as a characteristic to be obtained, it is
abbreviated as a specific elastic modulus (hereinafter referred to as E / ρ of a diaphragm to
widen a piston movement region). E: Elastic 串, ρ: Dense #) is creeping, O internal capacity in
order to smooth K in the high-pitch range, moderate internal loss in order to smooth K, VC mass
has a small mass to enhance efficiency Things can be said. Conventionally, various attempts have
been made to satisfy the above-described requirements in a single-plate diaphragm, but it has
been almost impossible to add these various requirements with a simple-configured diaphragm.
Recently, in order to obtain a diaphragm that has a slight movement, E / ρ or higher, and a
moderate internal loss, a honeycomb core made of a thin film of metal or quotient molecule * A is
used as a core material, and both sides of this core material are used. A diaphragm of a so-called
three-layer sand-inch structure, in which a metal polymer material and a film of a fiber distrained resin molded product are laminated to form a skin material, is open. In order to make it
a three-layer sand-inch structure, a heat-grading adhesive, a room-temperature curing adhesive,
and a heat-activated type adhesive agent of each type are used. The type of adhesive applied is
limited depending on the material of. Conversely, the selection range of the material of the core
material and the skin material is limited by the applied adhesive. That is, in the case of using a
metal foil of core 2 skin [when using metal foil such as aluminum, there is no problem with heat
resistance, so-a heat-curable adhesive that can obtain high adhesive strength in spare time and a
thermally activated adhesive with 11 points of fi You can use it. However, it is a side thermal
property or inferiority 76 ijJ 'to core old and skin material! , N-N ^ molecular phase sum [If you
use the old If Ifjj heat vortex or more-if it is hardened or not PJ 寵 61 cows will be 接 斉 11 月 i
月 11 -4-9 minutes The adhesive strength is not good ((47 can not be 3). That is, the core core
material is a skin material, gold 4 ′ ′ 4 t (compared to a smaller density and lighter) 1 or a thin
film made of a heat EJ yyi polymer material having a low heat resistance temperature, To use the
heat-pressing method of the thermoviscous adhesive agent in the heat-pressing method, it is
necessary to: Is it necessary to absorb the adhesive to cure the point, this '' adhesion? + + Ll is a
god buff, a shellfish or a limited ha, and in many cases it can not be obtained according to
sufficient 5J · degree ·. In addition, it is shown in Fig. 1 whether there is a unique 'C that it is
necessary to use a film-like or non-woven fabric-like adhesive at the contact * of the core core
and the surface layer. As in the adhesive (3), the core core material (1) and the surface layer (the
old part not involved in the adhesion of 21 at all is formed, so Il!
I! This is disadvantageous from the viewpoint of quantification, which is not limited to
thermally activated adhesives, but also to ordinary cold-setting adhesives or heat-curable
adhesives in which an adhesive is applied or impregnated to a skin material. In the case of using
a heat-curable adhesive, as in the case of the above-mentioned heat-activated adhesive, the
curing is limited to an adhesive having a low temperature. Although cold setting adhesives do not
melt in temperature, curing time is generally long and productivity is low and strength is often
insufficient. Therefore, despite the fact that thermoplastic microbes @ @ phase r use smaller
specific gravity than metal r such as aluminum to core material and skin material-i "one or @
electrification of the diaphragm is possible, thermoplasticity is high There was a problem that
molecular materials were not used so much. SUMMARY OF THE INVENTION The present
invention has been made to eliminate the above-mentioned disadvantages of the prior art, and at
least one of the honeycomb core and the skin phase is a thermoplastic polymer material. The
purpose is to provide a manufacturing method of a speaker diaphragm 茄 & 茄 and 紮 性 に よ り
by overlapping the both via heat activated adhesive and w: 両 者 by ultrasonic wave. I assume.
[Embodiments of the Invention] At least one of the honeycomb core and the skin material
according to the present invention is at least one of 9 examples such as hard 5 vinyl chloride
resin, cellulose acetate & (heat 5J 'plJ material such as fat 1 reinforced polyflopyrene resin and
polysulfone resin etc. Become. Examples of M-active adhesives according to the present invention
include polynamide-based, ethylene-vinyl acetate yarn and polyester-based adhesives. Father, Fig.
2 V (a perspective view of the honeycomb core, not shown). When the honeycomb core and the
surface layer are bonded by the thermal activation type # adhesive, it is limited to the contact
portion of the honeycomb core fi + and the surface layer (21, and the thermal activation type
adhesive (4) is limited to at least one of them. It is desirable to apply 1 layer of skin to a
honeycomb core and apply and spread by ultrasonic wave. That is, when a film-like or nonwoven-like adhesive is simply superposed on the entire surface of the skin material and
ultrasonically bonded, the core end face f511 / C the ultrasonic energy is concentrated and the
temperature rises by an amount corresponding to the wrinkles Since the light pigtail adhesive is
thermally fused at the end face of the core because it melts, it is further dropped to the hollow
cell (61 of the honeycomb core by the vibration of the ultrasonic wave, and this unmelted
adhesive which has been broken) There is nothing to say that it will affect the evil V. As
described above, when the adhesive is applied in advance only at the contact part of the
honeycomb core and the skin phase where the ultrasonic energy is concentrated and ultrasonic
bonding is performed, the whole of them can be used even if a core material or skin material
having a low heat resistance temperature is used. It is preferred because it gives the good result
that the applied adhesive part can be effectively heated and melted into a solid integral sand-inthe-plate structure without temperature rise.
Hereinafter, the present invention will be more specifically described by way of examples, but the
present invention is not limited thereby. Example 1 A honeycomb core made of a hard polyvinyl
chloride resin having a film thickness of 15 μm and having a cell size of 4 μm and a width of 3
μm is 5 cIIL in width. It was cut to a length of 2'Oz, and a polyamide-based heat-activated
adhesive having a melting point of 110 DEG C. was applied to the end face using a roll coater at a
thickness of about 60 .mu.m. Next, a cellulose acetate resin film of 190 μm J and V is laminated
on both sides as a surface material, vibration is applied for 2 seconds under the conditions of 1
frequency 20 KHz, output IKW, output IKW, amplitude 25 ttm ', and applied to the core end face
The resulting adhesive was melted in a heat generating bath to form an integral three-layered
diaphragm. The product was cut to a width of 3 cm and a length of 18 c +++, and the E / ρ and
internal loss were measured using a vibration lead method. The results are shown in Table 1.
Example 2 The same honeycomb core as in Example 1 was coated on the end face of the core to
a height of about 50 μm using a thermally activated bonding agent 接 roll coater of ethylene
vinyl acetate resin yarn having a melting point of 95 ° C. Next, a 200 μm) μ film of
polypropylene resin reinforced with graphite as a skin material was ultrasonic bonded to the core
double-sided rcl under the same conditions as in Example 1 to obtain vibration of a three-layer
sand 1-tchi structure . This product was tested in the same manner as in Example 1 to determine
the properties, and the results are shown in Table 1. Example 3 Real 71I except cell size is 3
battles! ifI! A polyester-based thermally activated adhesive with a melting point of 110 ° C
is applied to the end face of the core with a roll coater using a honeycomb core the same as +1 to
a thickness of 1 Oμm, and the core is made of 150μm-thick Bosu sulfone resin film as a surface
material. I put one on both sides. Next, super wave wave anchoring was performed under the
same conditions as in Example 1, and each characteristic was similarly measured. The results are
shown in Table 1. Comparative Example 1 Using the same honeycomb core as in Example 1, an
ethylene-acetate-based film-like hs agent was placed at both ends of the core. Furthermore, a 200
μm thick film t core of a polypropylene resin reinforced with graphite as a surface material is
stacked on both sides of the film for 30 to 60 seconds and heat pressed (100 ° C.). IKg / crIL)
was performed to obtain an integral three-layered diaphragm. The product was cut in the same
manner as in Example 1 and the characteristics were measured. The results are shown in Table 1.
Comparative Example 2 Using the same honeycomb core as in Example 1 and using a film of
cellulose acetate 4f (a fat of 200 μzo Jf) as a skin material, a room temperature curing type
epoxy fiber adhesive is coated on the entire surface of the skin material to a thickness of 50 μm.
IJ-Si, this M cloth surface was laid on both sides of the core and allowed to stand at room
temperature for 2 to 4 hours, and a diaphragm with an integral three-layered structure was
In this product, as in Example 1, e (cut and measure generality by measurement, and results are
shown in Table 11'j. As shown in Table 1, the vibration proof 7M according to the present
invention? Compared with the conventional ordinary adhesion method shown in Comparative
Examples 2 and 1 of the same strain, ie, the method of using a wetting agent on the entire
surface of the skin phase, 11, 12, 11, respectively, achieved 15 to 20 evanescence in terms of
surface density I can do it. Further, with the reduction of the weight, E / ρ also inevitably
increases by VC if the combination of the same material is used. Furthermore, the time required
for spreading was also significantly shortened by using ultrasound in combination with 1lliJ
ability. Furthermore, a combination of a thermally activated adhesive and ultrasonic waves allows
the use of thermal ciJ-like molecular materials having a lower specific temperature or lower
specific temperature or lower heat resistance than metal thin films such as aluminum while being
difficult to contact with ultrasonic waves. Since adhesion of glutinous medicine can be carried
out, the combination of the skin phase and the ridges of the core material became fjJ function as
described in the example. Next, with the configuration shown in Example 2, a 30 (m aperture
diaphragm was made. In this case, compare? Although one having the configuration shown in lJ
1 is used, the film adhesive 10 g is a must, but according to the present invention, it may be 09
to 1.0 g, and the Il of the diaphragm! f: It is possible to improve the efficiency and the
improvement of quantification and the E / 伴 う accompanying it. Figure 4 is. The sound pressure
(aB) -frequency (aZ)% characteristics of a 30 cIn aperture speaker diaphragm using the
configuration of Example 2 and Comparative Example 1 is good, but the one according to the
present invention has good sound quality. I know that it has the characteristics. Curves A and B
of the 41st curve 1 are respectively compared with Example 2 of Table 1? It is a characteristic
corresponding to lJ 1. [Effects of the Invention] As described above, at least one of the
honeycomb core and the skin material is a heat 5 J plastic polymer material as described above,
and the two are superimposed via a thermally activated adhesive agent, Since both are adhered
by ultrasonic waves, a thermoplastic polymer material can be used, weight reduction can be
achieved and adhesion time can be significantly shortened, and a method of manufacturing a
diaphragm with significantly improved fish seat property can be obtained. Can. Father, limited to
the contact area of the honeycomb core and the skin material. Interposing a thermally activated
adhesive agent and bonding by ultrasonic waves can reduce unnecessary adhesive wrinkles, and
also has the effect of achieving further weight reduction and at the same time improvement in
specific modulus and II strength. .
Brief description of the drawings
FIG. 1 is a cross-sectional view of a conventional diaphragm, FIG. 2 is a perspective view of a
honeycomb core, and FIG. 3 is a diaphragm according to the present invention.
41st! 1 is a frequency characteristic diagram showing the correlation between the frequency
(H2) of the vibration jkII plate applied with the diaphragm according to the present invention and
the conventional adhesive on the entire surface of the skin phase and the frequency (H2). In the
figure, (11) honeycomb core month, (2) is a skin phase, (3) is an adhesive, (4) is a heat activated
adhesive, and 51 is a hani. Cam core end face, (6 j is 9 empty cells of the honeycomb core, (A)
shows the characteristics 2 of the invention V (according to the present invention, the
characteristics of the 1 L LII plate according to the conventional method fc). In the two figures,
the same reference numerals indicate the same or equivalent parts. 1 ° Agent Masamichi Oiwa
Procedure Amendment (Spontaneous) 1. Indication of the case Japanese Patent Application No.
59-007589 2, Title of the Invention Method of manufacturing the speaker diaphragm 3, the
representative of the person who makes corrections To Toshihito Katayama Part 5 correction
target of the specification of the description of the invention column 6 of the correction The
contents (see page 6, lines 7-8 of "No more than". しかし。 K-correct ○ (2) Next to When
ultrasonic bonding on page 6, 1st row, The unmelted unnecessary adhesive does not fall into
the cell as described above. ,Also. Insert ". that's all
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