JP2006067043

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DESCRIPTION JP2006067043
PROBLEM TO BE SOLVED: To manufacture a material having an arbitrary thickness and physical
properties easily with a small number of steps without requiring large energy such as heat press
molding or vacuum molding, and to eliminate wastes and to eliminate the waste material at the
edge of the diaphragm of the electroacoustic transducer Provided is a manufacturing method and
an edge made thereby. SOLUTION: At least one of a pair of molds comprising an upper mold 2
and a lower mold 1 and having a desired clearance C is formed of a material which transmits
ultraviolet light and / or visible light 5. The mold 3 is set with the resin 3 cured by ultraviolet
light and / or visible light 5 and closed, and the ultraviolet 3 and / or visible light 5 is irradiated
from the outside of the light transmitting mold to cure the resin 3 inside and the edge 6 Make.
[Selected figure] Figure 1
Method of manufacturing edge for electroacoustic transducer and edge produced thereby
[0001]
An edge is provided on an outer peripheral portion of the electroacoustic transducer diaphragm
such as a speaker, and the outer peripheral portion of the diaphragm is vibratably supported by
the frame via the edge.
[0002]
Conventionally, as an edge material for a free edge diaphragm, for example, foam rubber, foam
material, coated cloth, solid rubber, EPDM sheet, urethane elastomer and the like can be used.
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The following are examples of documents related to them. JP 2001-36987 JP 6-26392 JP 626393 JP 7-15793 JP 8 65790 JP 8 140184
[0003]
When molding the edge by heating and pressure forming by heat press forming or vacuum
forming, etc., it is necessary to raise the mold temperature to near the melting point of the
material, and the large energy for heating and the mold is cooled and taken out There is a
problem that it is necessary, and it takes time.
[0004]
In the case of cloth materials, the adjustment of edges of cloth materials and foam materials is
controlled by impregnation in the case of cloth materials, and in the case of foam materials, it is
very important to adjust the minimum resonance frequency by controlling the thickness and
density of foam materials. Difficult.
[0005]
Furthermore, there is a problem that, since molding is performed using a flat material larger than
the part size, only the part to be used is cut out and used, leading to a large amount of waste and
an increase in the price of the part.
[0006]
The present invention has been proposed in view of the above, and the purpose thereof is that it
does not require a large energy such as heat press molding or vacuum molding, and has an
arbitrary thickness and physical properties easily with a small number of man-hours It is an
object of the present invention to provide a method of manufacturing an edge of an electroacoustic transducer diaphragm which can be manufactured with less waste and an edge
manufactured thereby.
[0007]
In the invention of claim 1, at least one of a set of molds consisting of the upper mold 2 and the
lower mold 1 is formed of a material which transmits ultraviolet light and / or visible light, and
cured by the ultraviolet light and / or visible light The resin 3 is set and closed, and the
ultraviolet and / or visible light is irradiated from the outside of the mold transmitting the
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ultraviolet and / or visible light to cure and mold the resin.
The invention of claim 2 relates to the edge manufacturing method according to claim 1, wherein
the thickness of the edge produced by molding the resin 3 corresponding to the clearance C
formed between the upper mold 2 and the lower mold 1 It is characterized by changing.
The invention according to claim 3 is characterized in that in the edge manufacturing method
according to claim 1 or 2, at least one material of a woven fabric and a non-woven fabric is set in
the mold, and the resin 3 is cured and molded. I assume.
According to the invention of claim 4, in the edge manufacturing method according to claim 1, 2
or 3, at least one material of organic fiber, inorganic fiber and whisker is mixed with the resin 3
and set in the mold. It is characterized in that the resin 3 is cured and molded.
According to the invention of claim 5, in the edge manufacturing method according to any one of
claims 1 to 4, the clearance of the outer peripheral portion of the clearance C between the upper
mold 2 and the lower mold 1 is largely taken and the gasket 8 is formed on the edge outer
peripheral portion. Are integrally formed. According to the invention of claim 6, in the edge
manufacturing method according to any one of claims 1 to 5, at least one member of the
diaphragm body 9 and the gasket 8 is set in the mold and the resin 3 is formed simultaneously. It
is characterized by joining. The invention of claim 7 is characterized in that the edge is produced
by the method according to claims 1 to 6.
[0008]
As described above, according to the present invention as set forth in claim 1, the resin 3 can be
produced in a short time of several seconds to several tens of seconds by ultraviolet light and /
or visible light as compared with vacuum molding, pressure molding, and heating and pressure
molding using upper and lower molds. Since it is made to harden ¦ cure and shape ¦ mold an
edge, it is not necessary to heat a metal mold ¦ die and can produce an edge with low energy and
in a short time.
[0009]
In addition, since the film does not cure until it is irradiated with ultraviolet light and / or visible
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light, the flowability is not inhibited, so that the edge 6 having a desired thickness can be easily
manufactured.
In addition, there is no need to feed the material at high speed, no holding pressure at high
pressure is required, and the equipment is inexpensive.
[0010]
Compared to vacuum forming, pressure forming, heating and pressing using upper and lower
molds, etc., the required amount of material is as high as the clearance C of the upper and lower
molds 2 and 1 when resin 3 having a volume substantially equal is obtained. Because they can be
disposed of, there is little material to be disposed of and they are environmentally and
economically excellent.
[0011]
According to the second aspect of the present invention, by changing the clearance C of the
upper and lower dies 2 and 1, an edge having a desired thickness can be formed, and the
minimum resonance frequency can be controlled by the thickness of the edge.
[0012]
According to the third aspect of the present invention, the fibrous material 7 such as a woven
fabric or a non-woven fabric can be simultaneously in-molded to have the same effect as the
coating material.
[0013]
According to the fourth aspect of the present invention, an edge 6 having a desired characteristic
can be obtained.
[0014]
According to the fifth aspect of the present invention, the gasket 8 can be easily formed
simultaneously by thickening the clearance of the outer peripheral portion.
[0015]
According to the sixth aspect of the present invention, integral molding with the diaphragm body
9 can be performed without using an adhesive.
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[0016]
According to the seventh aspect of the present invention, it is possible to obtain the edge 6 which
is easy and inexpensive to manufacture and has the desired characteristics.
[0017]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
[0018]
First Embodiment FIGS. 1 (1) to 1 (7) show a first embodiment of the present invention.
[0019]
In this first embodiment, first, as shown in FIGS. 1 (1) and 1 (2), a clearance C is provided on the
lower die 1 and an edge forming clearance portion 1a corresponding to the edge shape is formed
on the outer peripheral portion. Using a transparent lower mold 1 made of an acrylic resin
formed on the surface, as shown in the step of FIG. 1 (2), a liquid resin 3 in an uncured state
which is cured by ultraviolet light and / or visible light Is dropped in a predetermined amount.
[0020]
The resin 3 is a urethane acrylate resin as a main component, and is cured by ultraviolet light
and visible light having a viscosity of 20,000 [mPa · s] at 20 ° C., which is blended with benzoin
ether and benzophenone amines as a photopolymerization initiator It is preferable to use a resin.
The resin 3 is dropped in an amount substantially equal to the volume of the clearance C
between the upper and lower dies 2 and 1.
[0021]
As shown in FIG. 1 (3), the lower mold 1 and the upper mold 2 constitute a mold.
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The upper mold 2 is provided with a projection 1 b for edge molding corresponding to the edge
molding clearance 1 a of the lower mold 1.
[0022]
In this case, when the upper and lower dies 2 and 1 are closed, the clearance C between the
upper and lower dies 2 and 1 can be adjusted by adjusting the lowering position of the upper die
2.
This lowering position adjustment can be easily performed by a known technique.
[0023]
Therefore, by adjusting the clearance C, it is possible to obtain an edge of a desired thickness,
thereby easily controlling the stiffness of the edge and obtaining a desired lowest resonance
frequency.
[0024]
In addition, as a material of the type which transmits ultraviolet light and / or visible light, there
are, for example, soda glass, quartz glass, acrylic resin, polycarbonate resin and the like, and their
transmittances are shown in Table 1.
Acrylic resin is used in this embodiment because it has good moldability and good transmittance
as compared to polycarbonate resin.
[0025]
[0026]
Next, as shown in the process of FIG. 1 (4), the upper mold 2 is crimped to the lower mold 1 to
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close the mold and transmit ultraviolet light and / or visible light as shown in FIG. 1 (5). A light
source 4 for emitting ultraviolet light and / or visible light is set above the upper mold 2 made of
a material, and the resin 3 is irradiated with ultraviolet light and / or visible light 5 through the
upper mold 2 for a predetermined time by the light source 4 to cure the resin 3 And mold it.
The light source 4 may be disposed on the lower mold 1 side for irradiation, and in this case, the
curing time can be shortened.
[0027]
For example, an ultrahigh pressure mercury lamp was used as a light source, and irradiation was
performed for 5 seconds from above the upper mold 2.
At this time, the illuminance of the light beam after passing through the mold was 10 mW / cm
<2> at a wavelength of 365 nm and 120 mW / cm <2> at a wavelength of 405 nm.
[0028]
The resin 3 is cured, and after molding, the edge material 6A taken out after mold opening is
shown in FIG. 1 (6).
[0029]
The mold used is one in which both the lower mold 1 and the upper mold 2 are formed of a
material that transmits ultraviolet light and / or visible light 5, but only one of them is used as
the transmission material, and light 5 is emitted from the mold side. You may make it irradiate.
[0030]
The taken-out edge material can form the edge 6 if it pierces through the center part 6a, as
shown in FIG. 1 (7).
[0031]
Second Embodiment FIG. 2 shows a second embodiment of the present invention.
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[0032]
In this embodiment, as shown in FIGS. 2 (1) and 2 (2), after dropping the resin 3 in the lower
mold 1, as shown in FIG. 2 (3), of synthetic fibers, woven fabric or nonwoven fabric in advance,
At least one fibrous material 7 is set, the mold is closed as shown in FIGS. 2 (4) and (5), and the
ultraviolet light and / or visible light 5 by the light source 4 with the resin 3 in contact with the
fibrous material 7. Is different from the above-described embodiment in that the light is
irradiated.
[0033]
The position at which the fibrous material 7 is set is provided between the lower mold 1 and the
upper mold 2 onto which the resin 3 is dropped as shown in the illustrated example.
[0034]
The edge material 6A manufactured in this manner can have various physical properties that can
not be obtained by using the resin alone.
These are variously possible in combination with the fibrous material 7 such as woven fabric and
non-woven fabric and the resin material hardened by ultraviolet light and / or visible light 5.
Furthermore, if the fibrous material 7 such as woven fabric or non-woven fabric is used, rubber,
An edge material having any physical property can be obtained without any special pretreatment
such as secondary treatment such as latex coating.
[0035]
Thereafter, as shown in FIG. 2 (7), if the central portion 6a of the edge member 6A into which the
fibrous material 7 is integrated is pierced, the edge 6 having the fibrous material 7 can be
formed.
[0036]
Third Embodiment FIG. 3 shows a third embodiment of the present invention.
[0037]
This embodiment is characterized in that the clearance on the outer peripheral portion side of
the clearance formed between the upper and lower dies 2 and 1 is made large and the gasket is
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integrally formed on the edge outer peripheral portion.
[0038]
That is, specifically, as shown in FIG. 3 (3), the outer peripheral portion of the lower die opposing
surface of the upper die 2 is made concave, and a recess 1 c for forming a gasket is formed, as
shown in FIG. When the mold is closed, the resin is made to enter, and as shown in FIG. 3 (6), the
gasket 8 is integrally formed on the outer peripheral portion, as shown in FIG. 3 (7). To get the
[0039]
The other configuration is the same as that of the first embodiment.
[0040]
Fourth Embodiment FIG. 4 shows a fourth embodiment of the present invention.
[0041]
In this embodiment, as shown in FIG. 4 (1), a recess 1d corresponding to the shape of the
diaphragm body is formed in the central portion of the lower mold 1, and as shown in FIG. 4 (3),
the upper mold The second embodiment is characterized in that a corresponding protrusion 1e is
formed, and as shown in FIG. 4 (6), the diaphragm body 9 and the edge 6 are integrally formed.
[0042]
That is, as shown in FIG. 4 (2), the diaphragm body 9 is set in the recess 1d, and the resin 3 is
dropped on the clearance portion 1a for forming the edge of the outer periphery thereof.
[0043]
Next, as shown in FIGS. 4 (3) and 4 (4), the upper mold 2 is closed, and light is emitted as shown
in FIG. 4 (5).
[0044]
In this way, as shown in FIG. 4 (6), it is possible to obtain a molded product in which the
diaphragm body 9 and the edge 6 are integrated.
[0045]
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In this embodiment, as shown in FIGS. 4 (3) to 4 (5), the recess 8 for molding the gasket is used
as the upper mold 2 and the gasket 8 is simultaneously molded. Of course, it is also possible to
incorporate separate gaskets using those shown in FIG.
[0046]
In each of the above-described embodiments, a resin material in which at least one of organic
fibers, inorganic fibers, and whiskers is mixed may be used as the resin 3 as necessary to obtain
desired characteristics.
[0047]
Further, in the first to third embodiments of FIGS. 1 to 3, the shapes of the upper surface of the
lower mold 1 and the lower surface of the upper mold 2 opposed thereto are formed by dropping
the resin 3 onto the mold. The central part is punched out to form an edge, but the clearance is
initially taken as the clearance part of the edge, and resin 3 is dropped on that part as shown in
FIG. 4 (2) to form the edge. It is good.
In this case, the punching process can be reduced.
[0048]
It is 1st Example of this invention, (1)-(7) shows the manufacturing process of this invention.
(1)-(7) show the manufacturing process of 2nd Example of this invention.
(1)-(7) show the manufacturing process of 3rd Example of this invention.
(1)-(6) show the manufacturing process of 4th Example of this invention.
Explanation of sign
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[0049]
DESCRIPTION OF SYMBOLS 1 lower mold 1a clearance part 1b protrusion 1c recessed part for
gasket formation 1d recessed part for diaphragm body set 1e protrusion 2 upper type 3 resin 4
light source 5 ultraviolet ray and / or visible light 6 edge 6A edge material 6a central part 7
fibrous material 8 Gasket 9 diaphragm body C clearance
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