вход по аккаунту



код для вставкиСкачать
Patent Translate
Powered by EPO and Google
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
Industrial Applicability The present invention relates to a method of manufacturing an acoustic
diaphragm such as a microphone, a headphone, and a speaker O Background technology and its
problems In the acoustic diaphragm such as a microphone, a headphone, and a speaker, the edge
portion is flexible It is necessary that the rigidity of other parts be high 0 Other known methods
are used as a method of forming such an acoustic imaging plate, but none are suitable for mass
production There is a drawback that the characteristics of the product are not constant. In the
laminating method, which is one of such known methods, another film, such as a polyethylene
terephthalate film, is bonded to only the vibrating surface of the diaphragm. In this method, it is
necessary to prepare another film coated with an adhesive, which still requires a complicated
process of cutting the film to a predetermined size and bonding it to a predetermined location,
which is suitable as a mass production method Absent. In the resin coating method which is
another known method, the resin is applied and cured only on the vibrating surface of the
diaphragm to increase the rigidity, but the application is performed by brushing, dropping,
spraying, etc. It is difficult to partially apply the resin to the -1, f: only on the vibrating surface,
and coating unevenness is likely to occur, which may cause variations in product characteristics.
Furthermore, in another known method, single molding method, single molding is performed so
that the thickness of the vibrating surface of the diaphragm is thick and the thickness of the edge
portion is thin. However, in this method, the thickness of the vibrating surface and the edge is
extremely precise. It is difficult to mass-produce products of uniform characteristics. In order to
eliminate such a defect, the inventor of the present invention has been disclosed in Japanese
Patent Application No. 56-198803, which comprises a base film and a resin layer made of a
radiation or ultraviolet curable resin, and the vibration plane thereof is still radiation. We
proposed an acoustic diaphragm which is hardened by UV irradiation and its rigidity is increased
and its manufacturing method. However, in this case, since the resin layer is left in the uncured
state at the edge portion but is applied, the acoustic sensitivity is lowered as the application
thickness is increased in the high-pass portion. Problems arise. SUMMARY OF THE INVENTION
In view of the foregoing, the present invention provides a method of manufacturing an acoustic
diaphragm suitable for mass production, having constant product characteristics, and having
good sensitivity even in the high-pass portion of the acoustic diaphragm obtained. It is
SUMMARY OF THE INVENTION In the present invention, after forming a base film having a
coating layer of radiation or ultraviolet curable resin formed into a diaphragm shape, the
vibration or jj surface of this diaphragm shape is irradiated with radiation or ultraviolet light.
Acoustic vibration characterized in that the coating layer is partially cured and then the noncured portion of the coating layer is removed!
It relates to a method of manufacturing an l1II plate. EXAMPLE A method of manufacturing an
acoustic diaphragm according to the present invention will be described with reference to the
drawings. First, as shown in FIG. 1, a resin (2) to be cured by radiation or ultraviolet light is
formed on a base film (1) by an appropriate method. Next, as shown in FIG. 2, this base film is
molded into a known predetermined diaphragm shape using a molding machine, and a ring (3) is
formed on a portion corresponding to the outer peripheral edge of the edge portion of the
acoustic diaphragm. Apply layer). Subsequently, as shown in FIG. 6A, the base film is cut into a
number of diaphragms # 1 on a number of diaphragms, and a mask (4) is formed of an
appropriate material on an edge portion, and this portion To prevent curing. The molded body
(10) thus formed with the mask is irradiated with radiation, ultraviolet light and the like by an
appropriate means to harden its vibrating surface to an appropriate hardness, and the mask (4) is
removed. As a result, as shown in FIG. 5B, the cured resin layer (5) is formed on the molded body
0 (), while the resin layer (2) is not cured on the edge portion where the mask is formed. It is left
behind. When this resin 7 @ (2) is removed by an appropriate means, for example, with a solvent,
as shown in FIG. 6C, the resin cured only in the portion corresponding to &; The layer (5) is
formed and stiffened. FIG. 4 shows an example of a method of irradiating radiation or ultraviolet
light. In FIG. 4, the mask-formed moldings 00) are arranged in a large number on a plate l), and
the plates 1 are placed on a belt conveyor rotating at a predetermined speed. These molded
bodies (10) are irradiated with radiation or ultraviolet light when passing under the radiation or
ultraviolet irradiation device (I3). FIG. 5 shows another method for producing an acoustic
diaphragm. As shown, first, only the base film (1) is formed into a known predetermined
diaphragm shape as described above, and then the resin is sprayed (sprayed from one to form
the resin layer (2), and then the above-described The diaphragm can be manufactured in the
same manner as the method. In the present invention, the material which can be used as the base
film is not particularly limited as long as it is conventionally used for an acoustic diaphragm, but
polyethylene terephthalate is particularly preferable. As a method of applying the resin on the
base film, any conventional method can be used, and a spraying method, a brush coating method,
a gravure roll method, a doctor blade method and the like are exemplified.
As described above, the base film coated with the resin is molded into a known predetermined
shape using a molding machine, but the molding method applied in this case is not limited to any
specific method. For example, any suitable forming method such as pressure forming may be
used. Moreover, shaping | molding to a predetermined shape can be performed by a continuous
method or a batch method. Further, as described above, also in the case of forming the base film
before forming the resin layer, it can be formed in the same manner as the above-mentioned
method. In this case, a resin may be applied to the base film formed into a predetermined shape
by, for example, a spray method. Any resin can be used in the present invention as long as it can
be cured when irradiated with radiation and / or ultraviolet rays to impart desired rigidity to the
vibrating surface, and is limited to any specific resin. It is not a thing. As such a resin, for
example, it is preferable to use a monomer or an oligomer having an acrylic or methacrylic
double bond. Among such monomers, those having an acrylate double bond include, for example,
vinyl pyrrolidone, 2-ethylhexyl acrylate, lauryl acrylate, hydroxyethyl acrylate, ethoxyethoxy
acrylate, tetrahydrofurfuryl acrylate, AROEX M-5700 Names), diethylene glycol diacrylate,
tetraethylene glycol diacrylate, neopentyl glycol diacrylate, bifunctional monomers such as
AROEX M-6100 (trade name), trimethylolpropane triacrylate, and tetramethylolmethane
tetraacrylate And polyfunctional monomers such as dipentaerythritol hexaacrylate and
dipentaerythritol pentaacrylate. Among such monomers, those having a methacrylic double bond
are exemplified by those in which the acrylic double bond of the above-mentioned monomer is
replaced with a methacrylic double bond. Moreover, as a resin layer used as frame | skeleton
which has this double bond, an alkyd resin, polyester, an acrylic resin, a polyurethane, an epoxy
resin etc. are mentioned, for example. In the case of using an oligomer as a resin, it may be used
by swiftly converting to an oligomer by a conventional method using a monomer as described
above. The resin as described above is preferably used together with a photosensitizer, and upon
irradiation with light, the sensitizer decomposes to generate a radical, and the radical is
polymerized and crosslinked through the radical.
Examples of such a sensitizer include benzoin compounds and benzophenone-amine mixtures.
Examples of benzoin compounds include benzoin alkyl ethers and the like, and examples of the
alkyl include methyl, isopropyl, n-butyl, t-butyl and the like. Examples of the amine compound
used for the benzophenone-amine mixture include methyl jetanolamine, triethanolamine, Nmethylmorpholine, triethylamine, diptylamine, N, N-dimethylbenzylamine, N, N-dimethylaniline
and the like. Be As described above, the resin layer (2) of the non-cured portion is removed by
using, for example, a solvent, and methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone or
the like is used as the solvent. The molded product obtained as described above is divided into a
plurality of molded product pieces respectively constituting a diaphragm, or a predetermined
portion, that is, an edge portion is made of aluminum, in a continuous state without cutting and
separation. Mask with a pencil and then irradiate with radiation, ultraviolet rays and the like to
cure the exposed resin portion to give a predetermined rigidity. As radiation, an electron beam, a
gamma ray, etc. are used. In addition, the amount of radiation such as radiation and ultraviolet
light is not particularly limited, and may be appropriately selected in consideration of the type of
resin, curing speed and the like. Hereinafter, the present invention will be described by way of
specific examples. A polyethylene terephthalate film having a thickness of 9 μm is used as a
base film, and a polyfunctional acrylate monomer (i? A mixture of 5 products (rDPHA-J,
manufactured by Nippon Kayaku Kogyo Co., Ltd.) and a filler for preventing flow is applied by a
doctor blade method to a film thickness of 40 μm to form a laminated film did. Next, this
laminated film was pressure-formed to form a dome-shaped diaphragm for a dynamic
microphone. The edge portion of the diaphragm was masked with aluminum, and the dome
portion was cured by irradiating ultraviolet light under a condition of a distance of 20 ctn and a
strong [80 W / ''% feed rate of 10 tn1 / min. The diaphragm was then immersed in methyl ethyl
ketone to remove resin at the edge and dried to obtain the desired diaphragm. The result of
measuring the output frequency characteristic of the dynamic microphone using this diaphragm
is shown by a broken line in FIG. Also, as a comparative example, the output frequency
characteristics determined similarly for the dynamic type microphone using a diaphragm made
of only 9 μm polyethylene te W crate film are shown in FIG. 6 in practice.
In FIG. 6, in the microphone using the diaphragm according to the present invention, the high
region from 5.000 to 20,000 H7 is raised, the flat portion extends to the high region, and 500 to
500 as compared with the comparative example. 10, OOOiIz is near the same sensitivity. The
result of the audition was that the high frequency range was extended, the low frequency range
was distorted, the medium frequency range was good, and the sound localization was good as a
whole. Example 2 A polyethylene terephthalate film with a thickness of 12μ is used as a base
film, and on this base film, a multifunctional acrylate toner (trade name "Alonitsukas", Toa
Synthetic Chemical Industry (I'll JQ), and flow prevention The mixture with the filler of the above
was applied by doctor blade method to a film thickness of 50 .mu.m to form a laminated film.
Next, using this laminated film, a dome and r diaphragm of a tweeter for a two-way speaker
system were formed by pressure forming integrally a dome portion and an edge portion
constituting a vibrating surface. Mask the edge of this diaphragm with aluminum, irradiate
ultraviolet light under the conditions of 1 [20Crn, intensity 80W / Cm, feed rate 106 ′ ′ rnZ
for a mask of 1 [1] 20 (hardened ·) then this diaphragm Is immersed in methyl ethyl ketone to
remove resin at the edge portion and dried to obtain a desired diaphragm. 0 A sound pressure
frequency characteristic of a two-way speaker system using this diaphragm is measured. The
result is shown by a broken line in FIG. Also, as a comparative example, sound pressure
frequency characteristics measured in the same manner for a two-way speaker system using a
diaphragm made only of a polyethylene terephthalate film with a thickness of 12 μ are shown
by a solid line in FIG. Also in FIG. 7, in the two-way speaker system using the diaphragm
according to the present invention, the high region is extended compared to the comparative
example, and this is particularly noticeable around 20.0 OOH 7. In addition, the result of trial
listening was that the stability of the high region increased and the growth was good. The
advantages achieved by the invention are the following. That is, first, in the conventional doublemolded film, another film coated with an adhesive is positioned and tensioned at the time of
molding of the base film, which requires a complicated and time-consuming process. However,
the present invention has a great advantage that it can be mass-produced efficiently on the
manufacturing line without the need for this. Second, the control of the radiation surface of the
radiation and the ultraviolet rays makes it easy to control the modification of the vibrating
surface. it can.
Third, in order to remove the non-hardened portion of the resin coating layer, it is possible to
effectively prevent the decrease in sensitivity of the acoustic diaphragm as a whole 11 (1 volume,
especially when the resin coating layer is thick). Can. Therefore, it is possible to provide a
speaker, a headphone, a microphone, etc. with particularly good high frequency characteristics 0,
Brief description of the drawings
FIG. 1 is a cross-sectional view showing the structure of the interest of the sound η ° 18
diaphragm used in the present invention, FIG. 2 is a cross-sectional view showing a formed state,
and FIG. 6B is a cross section showing the cured resin, FIG. 6C is a cross section showing the noncured portion after removing the resin, and FIG. 4 is a radiation iMj!
Or, a perspective view showing an irradiation state of ultraviolet light, FIG. 5 is a cross-sectional
view showing a state in which a resin layer is formed by a spray method, and FIG. 6 shows output
frequency characteristics of a dynamic microphone of the present invention. The curve shown, @
97 is a curve showing the sound pressure frequency characteristics of the two-way speaker
system of the present invention. In the reference numerals used in the drawings, (1) base film (2)
resin layer (4) mask (5) cured resin layer (ft11 molded body (1,1 irradiation apparatus). Agent
Kaoya Katsutsunebuhiro Yoshio Sugiura Figure 1 Figure 2
Без категории
Размер файла
16 Кб
Пожаловаться на содержимое документа