close

Вход

Забыли?

вход по аккаунту

JP2013016958

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
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.
DESCRIPTION JP2013016958
An object of the present invention is to provide a speaker electrode which can reduce the weight
of the speaker and is excellent in flexibility and transparency. A speaker electrode according to
the present invention is a speaker electrode having a reticulated line made of a metal compound
(hereinafter, a reticulated line made of a metal compound is referred to as a conductive portion)
on a substrate. [Selected figure] Figure 2
Speaker electrode
[0001]
The present invention relates to a transparent and flexible speaker electrode that can reduce the
weight of the speaker.
[0002]
A speaker is a machine that converts an electrical signal into physical vibration to generate
sounds such as music and voice, and there are dynamic, electrostatic, and piezoelectric
conversion methods.
[0003]
Among these, the electrostatic speaker is easy to cope with thinning, space saving, and from the
principle of generating sound, it has directivity of sound and can make the sound reach far.
[0004]
04-05-2019
1
A typical conventional electrostatic speaker includes a fixed electrode having a plurality of holes,
a vibrating membrane, and a spacer for providing a gap for vibration between the two, and in this
state, the vibrating membrane and A direct current bias voltage is applied to the fixed electrode
by a bias current, and an alternating current signal such as an audio signal is applied between the
vibrating membrane and the fixed electrode.
[0005]
Here, since the force acting on the vibrating membrane of the electrostatic speaker is generally in
inverse proportion to the square of the distance between the fixed electrode and the vibrating
membrane, in order to reduce the sound pressure, the distance between the fixed electrode and
the vibrating membrane It is required to reduce the
[0006]
The fixed electrode has a role as an electrode and a role for passing the sound generated by the
vibrating film to the outside, and is a porous plate having conductivity such as punching metal, a
fiber having conductivity, a mesh of metal, DESCRIPTION OF RELATED ART The
electroconductive substrate etc. which opened the hole in the electrically conductive film vapordeposited with metal by the board ¦ substrate are used (for example, patent documents 1-3).
[0007]
Moreover, in patent document 4, in order to provide transparency to a speaker, what provided
the transparent electrode film in the glass or the acrylic plate is used as a fixed electrode.
[0008]
JP, 2009-260543, A JP, 2003-125, 315 A Patent No. 4682927 specification JP, 11-178098, A
[0009]
However, the above-described conventional techniques have the following problems.
[0010]
The electrostatic speaker disclosed in Patent Document 1 uses a porous plate of metal having
conductivity, so it does not have flexible bendability or transparency, and because it is metal,
weight reduction is also possible. There is a limit, and in Patent Document 2, since the conductive
substrate on which the metal is vapor-deposited is used as a fixed electrode, the speaker does not
have transparency, and the viewer is aware of the installation of the speaker.
04-05-2019
2
[0011]
In patent document 3, although a transparent member is used for a fixed electrode and a
diaphragm, since this member is glass, an acrylic board, etc., a softness ¦ flexibility can not be
provided to a speaker.
[0012]
Moreover, although the invention which used conductive films, such as ITO / In, Sn, and Zn oxide,
as a fixed electrode is also disclosed by patent document 4, the above-mentioned conductive film
is generally poor in bending resistance, The occurrence of a crack or a crack in the conductive
film causes the function as the conductive film to disappear, and the flexibility is poor.
[0013]
Therefore, a speaker electrode which can reduce the weight of the speaker and is excellent in
transparency and flexibility is desired.
[0014]
The present invention adopts the following configuration in order to solve the problem.
1) A speaker electrode having a mesh-like line made of a metal compound (hereinafter, a meshlike line made of a metal compound is referred to as a conductive part) on a substrate.
2) The speaker electrode according to the above 1), wherein the fluctuation rate of the surface
specific resistance value is within 20% before and after bending at a bending diameter of 10 mm.
3) The speaker electrode according to 1) or 2), further including a conductive layer configured of
the conductive portion and the resin portion, wherein the conductive portion is present on one
surface.
4) The electrode for a speaker according to 3), wherein the resin portion contains at least one
04-05-2019
3
compound selected from the group consisting of phosphoric acid ester, carboxylic acid ester, and
fatty acid ester.
5) The speaker electrode according to any one of the above 1) to 4), wherein the surface specific
resistance value is 0.1 to 100 Ω / □.
6) The speaker electrode according to any one of the above 1) to 5), wherein the mesh-like line of
the conductive part is an irregular mesh-like line.
7) A speaker using the speaker electrode according to any one of the above 1) to 6).
[0015]
According to the present invention, it is possible to reduce the weight of the speaker and to
provide a speaker electrode that is excellent in transparency and flexibility.
[0016]
Cross-sectional view of an example of a speaker electrode according to the present invention
Cross-sectional view of an example of a speaker electrode according to the present invention
Evaluation of bending method Top view of an example of irregular mesh-like line
[0017]
The present invention is a speaker electrode that solves the above problems, that is, a speaker
electrode that can reduce the weight of the speaker and is excellent in transparency and
flexibility, and more specifically, is configured of a metal compound on a substrate An electrode
for a speaker having a reticulated line (hereinafter, a reticulated line formed of a metal
compound is referred to as a conductive portion), and when it was configured as such, it was
investigated to solve the problem at once. It is a thing.
[0018]
Although an example of the cross-sectional structure of the electrode for speakers of this
invention is shown in FIG.1 and FIG.2, this invention is not limited to this.
[0019]
04-05-2019
4
It is important for the speaker electrode of the present invention to have a reticulated line
composed of a metal compound (hereinafter, a reticulated line composed of a metal compound is
referred to as a conductive part) on a substrate.
The fact that having a reticulated line composed of a metal compound on the substrate, that is to
say having a conductive part on the substrate means that the conductive part is in direct contact
with the substrate as shown in FIG. Thus, the embodiment also includes an aspect in which the
conductive portion is provided on the substrate via a resin portion described later.
[0020]
Here, the mesh-like line of the conductive part of the present invention indicates a structure in
which several points are connected by some line segments.
That is, the reticulated line in the present invention means a structure in which line segments
composed of a metal compound, the various additives described above, and the like are
connected at a plurality of points.
For example, in the case of a fibrous or wire-like metal compound, a wire exhibiting conductivity
by intertwining or overlapping in a state in which the fibrous or wire-like metal compounds have
at least one contact point. A portion is formed, and a portion surrounded by the line segment
becomes an opening and becomes a conductive portion of the mesh-like line.
Here, the opening surrounded by the line segments contributes to the transparency.
In the case of particulate metal compounds, a number of particulate metal compounds are
connected, contacted, and bonded to form a line segment, and the line segments formed of these
particulate metal compounds are several points. A mesh-like line can be obtained by overlapping
and surrounded portions becoming openings.
The reticulated lines may be regular reticulated lines (e.g., latticed lines) or irregular reticulated
04-05-2019
5
lines as described later.
[0021]
With the above-described configuration, it is possible to provide a speaker electrode excellent in
transparency and flexibility.
In addition, as long as the speaker electrode of the present invention has the above-described
conductive portion, other layers, such as an antireflective layer, a hard coat layer, an ultraviolet
blocking layer, an infrared blocking layer, an antifouling layer, a gas barrier layer, etc. The
embodiment further includes an embodiment further having a functional layer of
[0022]
It does not specifically limit as a metallic compound which comprises the above-mentioned
electroconductive part, Platinum, gold, silver, copper, nickel, indium, palladium, rhodium,
ruthenium, bismuth, cobalt, iron, aluminum, zinc, tin etc. are mentioned.
The metal compound may be a compound using one of these metals, or may be a metal
compound formed by combining two or more.
Further, even if the metal compound is not a pure metal, any metal compound that can finally
obtain a predetermined conductivity by a known conductive treatment such as an organic solvent
treatment, an acid treatment, a heat treatment, an energization treatment and the like may be
used. Also, metal oxides, metal salts of organic acids, metal salts of fatty acids, metal compounds
coated and bound with various compounds, and the like can be selected.
[0023]
The shape of the metal compound is not particularly limited as long as it can form a reticulated
line, and examples of the shape include fine particles, powders, fibers, and wires.
[0024]
04-05-2019
6
In addition to the metal compounds, various additives such as dispersants, surfactants, protective
resins, thermosetting resins and the like may be added to the above-mentioned conductive parts
if necessary to form a reticulated line. Containing an inorganic component such as an ultraviolet
curing resin, an antioxidant, a heat resistant stabilizer, a weather resistant stabilizer, an
ultraviolet absorber, a pigment, a dye, organic or inorganic fine particles, a filler, an antistatic
agent, an organic component it can.
In addition, even if it is not necessary to form the conductive portion, the substrate having the
conductive portion may contain various additives as described above even when it is necessary to
use it as the speaker electrode of the present invention. Also good.
[0025]
The conductive part of the present invention can be formed by applying a metal compound
dispersion on a substrate and then performing etching treatment or the like so as to form a
mesh-like line, but the metal compound dispersion is known on the substrate. It is preferable to
use a coating method such as a microgravure method, a comma coating method, a spray method,
a die coating method, an applicator method, a dipping method, or the like to form a reticulated
line.
When a contact type coating method in contact with the substrate is used as a method of
applying the metal compound dispersion, the portion in contact with the substrate is scratched,
and when the metal compound dispersion is applied, the portion in contact with the substrate is
Since problems such as generation of streaks may occur, it is preferable to use a noncontact
coating method which does not contact the substrate.
[0026]
A thermoplastic resin film can be used as a substrate used for the speaker electrode of the
present invention. When the substrate is a thermoplastic resin film, it is preferable in terms of
transparency, flexibility, processability, and the like. Further, in order to enhance the
transparency of the speaker electrode of the present invention, it is desirable to use a highly
transparent substrate (a substrate with high transmittance) as a substrate used for the electrode.
04-05-2019
7
[0027]
The thermoplastic resin film suitable as a substrate in the electrode of the present invention is a
general term for a film which melts or softens by heat, and is not particularly limited, but as a
representative, polyester film, polypropylene film And polyolefin films such as polyethylene film,
polylactic acid film, polycarbonate film, acrylic film such as polymethyl methacrylate film and
polystyrene film, polyamide film such as nylon, polyvinyl chloride film, polyurethane film,
fluorine film, polyphenylene sulfide film, etc. Can be used.
[0028]
These may be homopolymers or copolymers.
Among them, polyester films, polypropylene films, polyamide films and the like are preferable in
terms of mechanical properties, dimensional stability, transparency and the like, and polyester
films are particularly preferable in terms of mechanical strength and versatility.
[0029]
In addition, in the thermoplastic resin film, various additives such as antioxidants, heat
stabilizers, weather stabilizers, ultraviolet absorbers, organic lubricants, pigments, dyes, organic
or inorganic fine particles, fillers Antistatic agents, nucleating agents and the like may be added
to the extent that they do not deteriorate the characteristics.
[0030]
The thickness of the thermoplastic resin film is not particularly limited and may be appropriately
selected depending on the mechanical strength, handling properties, speaker characteristics and
the like, but is preferably 10 to 500 μm, more preferably 30 to 250 μm. Most preferably, it is
50 to 150 μm.
[0031]
The speaker electrode of the present invention preferably has a variation rate of the surface
specific resistance value of 20% or less before and after bending at a bending diameter of 10
04-05-2019
8
mm.
Here, as shown in FIG. 3, the method of evaluating the fluctuation rate of the surface specific
resistance value before and after bending at a bending diameter of 10 mm installs a cylindrical
rod with a diameter of 10 mm on the conductive portion of the substrate and uses this as a
fulcrum The surface specific resistance value of the electrode after bending the electrode 100
times is measured, and the ratio of the absolute value of the difference of the surface specific
resistance value of the electrode before and after bending to the surface specific resistance value
of the electrode before bending is It is a change rate.
That is, it can be obtained by the following equation.
[0032]
Rate of change of surface resistivity (%) = "absolute value of difference in surface resistivity of
electrode before and after bending" / "surface resistivity of electrode before bending" × 100
Rate of variation of surface resistivity mentioned above Is more preferably within 10%, still more
preferably within 5%. Before and after bending at a bending diameter of 10 mm, when the
variation of the surface specific resistance value of the electrode is greater than 20%, sufficient
function is exhibited when the speaker using the speaker electrode of the present invention is
bent. There is a possibility that good sound quality and sound pressure can not be obtained. In
addition, although it is preferable that the fluctuation rate of the above-mentioned surface
specific resistance value is ideally 0%, a mesh-like line in a state in which the metal compound is
more in close contact under the influence of an external force applied to the conductive portion
in the bending test. In fact, the lower limit value of the above-mentioned fluctuation rate seems to
be about 1% because it is conceivable that there is a possibility of cracking or cracking in part of
the mesh-like line.
[0033]
The speaker electrode of the present invention preferably has a conductive layer formed of the
above-described conductive portion and resin portion, and the above-described conductive
portion preferably exists on one surface of the electrode. That is, a preferred embodiment of the
electrode of the present invention is a laminate of a substrate and a conductive layer having a
conductive layer composed of a conductive part and a resin part, and the conductive part in the
04-05-2019
9
conductive layer is an electrode (laminate) It is an aspect which exists in one surface of. In the
electrode of the present invention according to this preferred embodiment, the conductive
portion may be in contact with the substrate, or the conductive portion may be separated from
the substrate while the substrate is in contact with the conductive layer (FIG. 2). Since the
electrode of the present invention is composed of a conductive portion and a resin portion and
has a conductive layer, disconnection and scratch resistance of the conductive portion are
improved, so that the conductivity deterioration of the conductive layer is suppressed and
handling is improved. be able to. In addition, when the speaker electrode of the present invention
has a conductive layer, as shown in FIG. 2, it is necessary that a conductive portion be present on
one surface of the electrode in order to apply a voltage.
[0034]
The conductive layer composed of the conductive portion and the resin portion described above
includes various additions as long as the characteristics of the conductive layer are not impaired
if the conductive layer and the resin portion constitute the conductive portion. It is also possible
to contain an agent or the like. Examples of the additive include an antioxidant, a heat stabilizer,
a weathering stabilizer, organic or inorganic fine particles, a filler, and a metal adhesion improver
such as a phosphate ester described later.
[0035]
The total content of the metal compound and the resin is not particularly limited with respect to
the content of the metal compound forming the conductive part and the resin forming the resin
part in the conductive layer, but in 100% by mass of all components of the conductive layer, It is
preferable that 50 mass% or more and 100 mass% or less be the total amount of the metal
compound and the resin. Further, the content ratio of the metal compound to the resin in the
conductive layer is not particularly limited, and the ratio of the metal compound to the resin
which can obtain a surface resistivity value sufficient for the speaker electrode can be
appropriately selected. good.
[0036]
Although the resin used for the resin part which comprises the conductive layer of this invention
is not specifically limited, It is preferable that it is resin obtained from an ultraviolet curable
04-05-2019
10
compound or resin obtained from a thermosetting compound. The ultraviolet curable compound
or the thermosetting compound is not particularly limited, but it is preferable to use a
trifunctional or higher polyfunctional acrylate.
[0037]
Specific examples of trifunctional or higher polyfunctional acrylates include pentaerythritol tri
(meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol tri (meth) acrylate,
dipentaerythritol tetra (meth) acrylate, and di-pentaerythritol tri (meth) acrylate. Pentaerythritol
penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, trimethylolpropane tri (meth)
acrylate, urethane acrylate, pentaerythritol triacrylate hexane methylene diisocyanate urethane
polymer and the like can be used. These trifunctional or higher polyfunctional acrylates can be
used alone or in combination of two or more. Moreover, as an ultraviolet ray curable compound
or thermosetting compound containing a trifunctional or higher polyfunctional acrylate which is
commercially available, Mitsubishi Rayon Co., Ltd .; (trade name "Dia Beam" series etc.), Nagase
Sangyo Co., Ltd .; (Denacole series etc.), Shin-Nakamura Co., Ltd .; (brand name "NK Ester" series
etc.), Dainippon Ink & Chemicals, Inc .; (brand name "UNIDIC" etc.), Toho Synthetic Chemical
Industry Co., Ltd .; Nippon Oil Co., Ltd. ("Blenmar" series etc.), Nippon Kayaku Co., Ltd. (brand
name "KAYARAD" series etc.), Kyoeisha Chemical Co., Ltd. (brand name "Light Ester" series etc.),
Daicel Cytec Co., Ltd .; (trade name "Ebecryl" series etc.) It is possible to use the Luo products.
[0038]
In addition to trifunctional or higher polyfunctional acrylates, allyl ester monomers: diallyl
orthophthalic acid, diallyl isophthalic acid, diallyl terephthalate, diallyl 1,4cyclohexanedicarboxylate, diallyl succinic acid, acrylic acid ester monomer and methacrylic acid
ester Monomers: methyl methacrylate, isobutyl methacrylate, 2-ethylhexyl methacrylate, 2hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, phenol EO adduct acrylate,
nonylphenol EO adduct acrylate, bisphenol A EO adduct dimethacrylate, bisphenol A EO Adduct
diacrylate, polyethylene glycol dimethacrylate, polyethylene glycol diacrylate, 1, 6 Xandiol
diacrylate, phenoxyethyl methacrylate, isobornyl methacrylate, benzyl methacrylate, cyclohexyl
methacrylate, dicyclopentenyl oxyethyl acrylate, dicyclopentenyl oxyethyl methacrylate,
trimethylolpropane diacrylate, trimethylolpropane dimethacrylate, glycerin diacrylate, Resin
obtained from a UV curable compound such as glycerin dimethacrylate, glycerin dimethacrylate,
2,6-dibromo-4-tert-butylphenyl acrylate, various urethane acrylates, epoxy acrylate or resin
obtained from a thermosetting compound It can be used as the resin of the resin part that
constitutes the conductive layer.
04-05-2019
11
[0039]
In the present invention, as a method of curing the above-mentioned ultraviolet ray curable
compound or thermosetting compound, for example, a method of irradiating an ultraviolet ray as
an actinic ray, a high temperature heating method or the like can be used. It is desirable to add a
photopolymerization initiator, a thermal polymerization initiator, etc. to the above-mentioned
ultraviolet ray curable compound or thermosetting compound.
[0040]
Specific examples of the photopolymerization initiator include acetophenone, 2,2diethoxyacetophenone, p-dimethylacetophenone, p-dimethylaminopropiophenone,
benzophenone, 2-chlorobenzophenone, 4,4'-dichlorobenzophenone, 4,4'Bisdiethylaminobenzophenone, Michler's ketone, benzyl, benzoin, benzoin methyl ether, benzoin
ethyl ether, benzoin isopropyl ether, methyl benzoyl formate, p-isopropyl-αhydroxyisobutylphenone, α-hydroxyisobutylphenone, 2, Carbonyl compounds such as 2dimethoxy-2-phenylacetophenone, 1-hydroxycyclohexyl phenyl ketone, tetramethylthiuram
monosulfide, tetramethylthiol It is possible to use sulfur compounds such as uram disulfide,
thioxanthone, 2-chlorothioxanthone, 2-methyl thioxanthone and the like.
These photopolymerization initiators may be used alone or in combination of two or more.
Further, as a thermal polymerization initiator, peroxide compounds such as benzoyl peroxide or
di-t-butyl peroxide can be used.
[0041]
The use amount of the photopolymerization initiator or the thermal polymerization initiator is
suitably 0.01 to 10 parts by mass with respect to 100 parts by mass of the ultraviolet ray curable
compound and / or the thermosetting compound to be used. When electron beam or gamma ray
is used as the curing means, it is not always necessary to add a polymerization initiator. In the
case of heat curing at a high temperature of 200 ° C. or more, the addition of a thermal
polymerization initiator is not necessarily required.
[0042]
04-05-2019
12
The conductive layer in the present invention preferably has a hard coat property. Since the
conductive layer has hard coatability, the hardness of the layer can be improved and the film
strength and scratch resistance can be improved, so that the deterioration of the conductivity of
the conductive layer can be suppressed and the handling property can be improved. it can.
[0043]
The term "having a hard coat property" as used herein means a pencil having a cylindrical core of
pencils of various hardness using a surface characteristic tester Haydon (manufactured by Shinto
Scientific Co., Ltd. MODEL: HEIDON-14D) (MITSU-BISHI) It is shown that the pencil hardness of
the surface of the conductive layer is B or more when the core of the pencil is placed on the
surface of the conductive layer and the scratch test is performed with a load of 500 g and a
speed of 30 mm / min.
[0044]
In the case where the conductive layer in the present invention has a hard coat property, a
network-like line made of a metal compound which is a conductive portion is hard to break and it
is possible to maintain the conductivity, which is preferable.
The hard coatability of the conductive layer is determined after curing as a UV curable
compound and / or a thermosetting compound (a UV curable compound and / or a thermosetting
compound that is a raw material of the resin part) used when producing the conductive layer It
can be applied by selecting a compound that has hard coat properties.
[0045]
The resin portion in the present invention preferably contains at least one compound selected
from the group consisting of phosphoric acid ester, carboxylic acid ester, and fatty acid ester
(Such compound is referred to as a metal adhesion improver). The compound may be contained
in the resin part, but from the viewpoint of improving the adhesion between the conductive part
constituting the conductive layer and the resin part, the compound is present in the vicinity of
the interface with the conductive part in the resin part. Preferably it is present. Moreover, as said
compound (metal adhesion improving agent), phosphoric acid ester is the most preferable. When
04-05-2019
13
the resin portion contains at least one of the compounds (metal adhesion improver), the
conductive portion can be easily transferred when obtaining the speaker electrode of the present
invention by the transfer method described later.
[0046]
The metal adhesion improver used in producing the conductive layer is 0.1 to 0.1 parts by mass
with respect to a total of 100 parts by mass of the ultraviolet curable compound and / or the
thermosetting compound used to obtain the resin part in the conductive layer. It is preferably 10
parts by mass.
[0047]
The surface specific resistance value of the speaker electrode of the present invention is
preferably 0.1 to 100 Ω / □.
Here, the surface specific resistance value means an average value when measuring at least three
places at random. The surface specific resistance value is more preferably 0.1 to 30 Ω / □, and
still more preferably 0.1 to 10 Ω / □. In order to control the surface specific resistance value of
the speaker electrode to 0.1 to 100 Ω / □, known conductive treatment methods such as an
organic solvent treatment, an acid treatment, a heat treatment, and an energization treatment
may be performed. For example, by immersing the speaker electrode in acetone at 25 ° C. for
30 seconds, heat treatment at 150 ° C. for 2 minutes can lower resistance than before the
treatment, and the surface specific resistance value of 0.1 to 100 Ω / □ However, the method
and conditions for conducting treatment are not particularly limited.
[0048]
If the surface specific resistance value of the electrode is larger than 100 Ω / □, the function as
a speaker electrode can not be exhibited, which is not preferable. Although it is preferable that
the surface specific resistance value of the electrode is low, it is practically difficult to make the
surface specific resistance value less than 0.1 Ω / sq. Therefore, the surface specific resistance
value of the electrode has a lower limit of 0.1 Ω / sq. Conceivable.
[0049]
04-05-2019
14
Here, the measurement of the surface specific resistance value of the above-mentioned speaker
electrode is performed according to JIS-K-7194 (established in 1994) under the atmosphere after
standing for 24 hours at normal temperature (23.degree. C., relative humidity 65%). It can
measure using a form in conformity with Loresta-EP (Mitsubishi Chemical Co., Ltd. model
number: MCP-T360).
[0050]
It is preferable that the reticulated lines of the conductive portion of the present invention be
irregular reticulated lines.
Here, the irregular mesh-like line indicates that the shape of the opening forming the mesh-like
line and the shape and line width of the linear portion are irregular. In other words, irregular in
this irregular network line means that the above-mentioned network structure is irregular in the
shape or size of the opening, or the shape of the mesh area, that is, the linear area. It means that
it is not a straight line but a line thickness is irregular. It can be specified by the observation
image of a differential interference microscope etc. The shape and size of the structure of the
opening surrounded by line segments Are irregular, for example, irregularly sized circles, ovals,
triangles, quadrilaterals, polygons such as pentagons, or a composite shape of these. For
example, as an irregular shape, the shape as described in Unexamined-Japanese-Patent No. 10312715, 2008-243547 grade ¦ etc., Is mentioned.
[0051]
It is preferable that the mesh-like lines of the conductive portion of the present invention be
irregular mesh-like, since no moiré phenomenon occurs when the speaker electrode of the
present invention is disposed to face each other. Here, the moiré phenomenon is "striped mottles
that occur when points or lines are geometrically regularly distributed," and according to Kouji,
"the points or lines are geometrically Striped mottles that occur when overlapping those that are
regulated correctly. This is likely to occur when copying a halftone print using a halftone print as
a manuscript. Therefore, when an electrode having a conductive portion of a regular network-like
line is used, a moire phenomenon is likely to occur, but the electrode having a conductive portion
of the irregular network-like line of the present invention is used. In this case, since the moire
phenomenon does not occur, it is advantageous from the viewpoint of visibility that the
conductive portion of the present invention is an irregular mesh-like line.
04-05-2019
15
[0052]
The speaker electrode of the present invention preferably has a total light transmittance of 50%
or more, preferably 75% or more, and more preferably 80% or more. If the total light
transmittance is less than 50%, problems may occur in terms of visibility and transparency.
[0053]
The total light transmittance of the speaker electrode is preferably as high as possible, and the
upper limit thereof is not particularly limited. However, considering the light reflection on the
surface of the electrode, it is difficult to make the total light transmittance of the electrode higher
than 92%. As it is conceivable, the total light transmittance of 92% seems to be the physical limit
(upper limit) of the total light transmittance of the speaker electrode.
[0054]
The speaker electrode of the present invention can be used for an electrostatic speaker, and in
that case, the speaker electrode may be provided with a plurality of holes.
Here, the holes play a role of transmitting the sound generated by the diaphragm of the
electrostatic speaker. The size and spacing of the holes are not particularly limited as long as
good sound quality can be obtained without losing the conductivity of the speaker electrode.
[0055]
The speaker electrode of the present invention is a laminate having a mesh-like line made of a
metal compound on a substrate (the laminate shown in FIG. 1; hereinafter, this laminate is
referred to as a mesh-like metal compound laminate) By using it, a speaker electrode can be
suitably obtained. In addition, the speaker according to the preferred embodiment of the present
invention, which has the conductive layer including the conductive portion and the resin portion
and the substrate by using the mesh-like metal compound laminate, and further has the
conductive portion on one surface. The electrode can be obtained by a simple method.
Hereinafter, the manufacturing method of the electrode for speakers of the preferable aspect of
this invention using the mesh-like metal compound laminated body is demonstrated, respectively.
04-05-2019
16
[0056]
A method of forming a coating of a metal compound on a substrate and forming a mesh-like line
by etching or photolithography, or a line of a metal compound dispersion on a substrate It can be
obtained by a method of coating or printing as formed, and it can be used as a speaker electrode
of the present invention. In addition, the network-like metal compound laminate thus obtained
can be controlled to have a surface specific resistance value of 0.1 to 100 Ω / □ by conducting
the conducting treatment by a known conducting treatment method. .
[0057]
In addition, the speaker electrode according to a preferred embodiment of the present invention,
which has a conductive layer including a conductive portion and a resin portion and a substrate,
and the conductive portion is present on one surface, has been subjected to the above-described
conductive treatment. An ultraviolet ray curable compound or a thermosetting compound is
applied on the surface having the conductive part of the mesh metal compound laminate, and a
new substrate is laminated and then cured, and the mesh metal compound laminate is formed.
Transfer method for transferring the conductive layer to the newly bonded substrate by Step 2 of
peeling the substrate and the conductive layer (the conductive portion and the portion (resin
portion) obtained by applying and curing the resin) And overcoating a resin comprising an
ultraviolet-curable compound or a thermosetting compound so that the surface of the conductive
part is exposed on the surface of the conductive part of the network-like meshed metal
compound laminate subjected to the above-mentioned conductive treatment. By It is possible to
obtain.
[0058]
By using the above-described transfer method, the speaker according to the preferred
embodiment of the present invention, which has a conductive layer and a substrate composed of
a conductive portion and a resin portion relatively easily, and the conductive portion exists on
one surface. An electrode can be obtained, and the surface of the conductive layer obtained by
this method has excellent smoothness, and therefore, there is an advantage that it is difficult to
cause bubbles or troubles in bonding when bonding to another member. Have.
[0059]
04-05-2019
17
The speaker electrode obtained by using the overcoat method has no problem as long as the
conductive portion exists on the surface of the conductive layer, but the leveling property of the
ultraviolet ray curable compound or the thermosetting compound causes a problem. It is difficult
to uniformly fill the openings of the reticulated metal compound laminate, and when all the
reticulated lines that are conductive portions are covered by the overcoat layer, the function as a
speaker electrode can be expressed. You need to be careful because you can not.
From the above, it is preferable to obtain a speaker electrode having a conductive layer using a
transfer method.
[0060]
Various coating methods can be applied as a method of applying an ultraviolet ray curable
compound or a thermosetting compound to the surface of the mesh-like metal compound
laminate having the conductive portion in step 1 of the above-mentioned transfer method, and is
not particularly limited. For example, reverse coating, gravure coating, rod coating, bar coating,
die coating or spray coating can be used.
[0061]
Further, before applying or printing the metal compound dispersion on the substrate so as to
form a mesh-like line in step 1 of the transfer method described above, the surface of the
substrate is coated with an anchor coating agent or a primer layer, Hydrophilic treatment, corona
discharge treatment, plasma treatment or the like may be performed.
As a method of applying the metal compound dispersion onto the substrate, it is preferable to
use a die coating method, an applicator method, a comma coating method, a dipping method or
the like.
[0062]
Hereinafter, although the electrode for speakers of this invention is illustrated more concretely
and demonstrated, this invention is not limited to this.
04-05-2019
18
That is, the metal compound dispersion liquid is applied to the substrate to form a laminate
(network metal compound laminate) having a mesh-like line formed of the metal compound.
Thereafter, the reticulated metal compound laminate is heat-treated at 150 ° C. for 2 minutes,
treated with acetone for 30 seconds, put into 1N hydrochloric acid, and left for 1 minute.
Thereafter, the mesh-like metal compound laminate is taken out, washed with water, and dried to
obtain a mesh-like metal compound laminate subjected to a conductive treatment.
[0063]
Subsequently, a UV curable compound to which a photoinitiator is added is applied by a wire bar
on the surface of the obtained network metal compound laminate on which the conductive
portions are laminated, and heat treatment is performed at 90 ° C. for 1 minute. After bonding
together the substrates, curing the UV curable compound by irradiation with UV light to make a
resin, and finally peeling off the substrate constituting the mesh metal compound laminate and
the mesh line composed of the metal compound Thus, the speaker electrode can be suitably
obtained. By manufacturing the speaker electrode of the present invention using the method
described above, it is possible to obtain a speaker electrode which is excellent in both
transparency and flexibility. [Method of Measuring Characteristic and Method of Evaluating
Effect] The method of measuring the characteristic of the speaker electrode prepared in each
example and comparative example and the method of evaluating the effect are as follows. (1)
Surface observation (shape observation) The surface of the surface of the speaker electrode
having the conductive portion is observed with a differential interference microscope (LEICA
DMLM, manufactured by Leica Microsystems, Inc.) at a magnification of 100 times, and the
presence or absence of the mesh and the shape are observed. I observed it. (2) Surface specific
resistance value The surface specific resistance value of the speaker electrode is determined by
leaving the speaker electrode in a normal state (23 ° C., relative humidity 65%) for 24 hours
and then under the atmosphere of JIS-K-7194 (1994). In a form conforming to the above, using a
Loresta-EP (manufactured by Mitsubishi Chemical Corporation, model number: MCP-T360). The
unit is Ω / □. In addition, this measuring device can measure 1 * 10 <6> ohms / square or less.
(3) Total Light Transmittance The total light transmittance is measured after leaving the speaker
electrode for 2 hours under normal conditions (23 ° C., 65% relative humidity), and then the
fully automatic direct reading haze computer HGM manufactured by Suga Test Instruments
Co., Ltd. Using the -2DP , measurement was performed with the light source placed
vertically to the surface of the surface having the conductive portion of the speaker electrode.
The measurement was performed at three random points, and the average value was taken as the
total light transmittance. (4) Flexibility test A cylindrical rod with a diameter of 10 mm was
placed on the conductive part of the speaker electrode, and the speaker electrode was bent 100
times with this rod as a fulcrum. Using the absolute value of the difference between the surface
04-05-2019
19
specific resistance values of the electrodes before and after bending and the surface specific
resistance value of the electrode before bending, the fluctuation rate of the surface specific
resistance value was determined by the following equation. Was measured by the abovementioned measurement method.
[0064]
Variation rate of surface resistivity (%) = "absolute value of difference in surface resistivity of
electrode before and after bending" / "surface resistivity of electrode before bending" x 100 (5)
Speaker operation test Speaker electrode In a speaker configuration in which a vibrating
membrane having conductivity is installed using a spacer between the two electrodes with a gap
between them, a predetermined bias voltage is applied to the vibrating membrane and is applied
to the speaker electrode. The operation test as a speaker was done by changing the voltage. The
case where the operation as a speaker was not recognized was "x", the case where the operation
was recognized but the sound quality was inferior was "○", the operation was recognized, and
the case where the sound quality was good was "と し た". (6) Moire resistance evaluation: In
front of the screen of the LCD display material, hold the screen and the speaker electrode almost
parallel, rotate the speaker electrode, and visually check whether the moire phenomenon occurs
during rotation It evaluated by confirming. Moreover, in the speaker structure of the abovementioned speaker operation test, it was evaluated by visually observing whether a moire
phenomenon appears. In any of the evaluations, those in which no moiré was observed were
rated as ○ , and those in which moiré was observed partially in any of the evaluations were
rated as Δ . If it is "(circle)" by visual observation, moire resistance was made favorable.
[0065]
Next, the present invention will be described based on examples.
[0066]
(Reticulated Metal Compound Laminate 1) A fine metal particle solution XA-9053 manufactured
by Fujikura Kasei Co., Ltd. is screen-printed on one side of a biaxially stretched polyethylene
terephthalate film (Lumirror (registered trademark) T60 manufactured by Toray Industries, Inc.)
Printing on a regular mesh-like (lattice-like) line, a network metal compound laminate 1 having a
network-like line formed of a metal compound was obtained.
[0067]
(Reticulated metal compound laminate 2) A transparent conductive substrate having a surface
04-05-2019
20
resistivity of 10 Ω / □ having irregular reticulated lines composed of a metal compound on a
polyethylene terephthalate film (manufactured by Toray Film Co., Ltd. Nano) The silver
transparent conductive film TCC-010 was used as the mesh-like metal compound laminate 2.
[0068]
(Ultraviolet-curable compound 1) As the ultraviolet-curable compound 1, the ultraviolet-curable
compound 1 in which the mixing ratio of the following ultraviolet-curable compound A and the
ultraviolet-curable compound B is 60/40 (wt / wt) was used.
UV curable compound A: tetrafunctional urethane acrylate (manufactured by Daicel-Cytec Co.,
Ltd. Ebecryl (registered trademark) 8405) UV curable compound B: nonylphenol EO modified
acrylate (manufactured by Toagosei Co., Ltd. ALONIX (registered trademark) M111) ( Example 1)
The reticulated metal compound laminate 1 was heat-treated for 2 minutes in a hot air oven
(PHA-H, manufactured by Tabai Espec Corp.) at 150 ° C., to form a speaker electrode.
The total light transmittance of the obtained speaker electrode was 70%, and the surface specific
resistance value was 28.4 Ω / □.
Since the surface specific resistance value after the bending test was 33.5 Ω / □, the variation of
the surface specific resistance value before and after the bending test was 18.0%, and it was 「
in the speaker operation test.
[0069]
Example 2 The reticulated metal compound laminate 1 was heat-treated in the same manner as
in Example 1, and then immersed in acetone (Sasaki Chemical Co., Ltd.) at 25 ° C. for 30
seconds, and dried at 25 ° C. for 3 minutes After that, heat treatment was carried out for 2
minutes in a hot air oven at 150 ° C. to form a speaker electrode. The total light transmittance
of the obtained speaker electrode was 82%, and the surface specific resistance value was 15.3 Ω
/ □. Since the surface specific resistance value after the bending test was 16.7 Ω / □, the
variation of the surface specific resistance value before and after the bending test was 9.2%, and
was o in the speaker operation test. Moreover, the moire-proof evaluation was also
favorable, and was "(circle)".
04-05-2019
21
[0070]
Example 3 The mesh-like metal compound laminate 2 was used as it is as a speaker electrode.
The surface specific resistance values before and after the bending test were 10 Ω / □ and 10.6
Ω / □, respectively, the fluctuation rate was 6.0%, and it was ◎ in the speaker operation
test. Moreover, the moire-proof evaluation was also favorable, and was "(circle)".
[0071]
(Example 4) 100 parts by mass of the ultraviolet curable compound 1 is made on the surface on
which the conductive part of the mesh-like metal compound laminate 2 is laminated, while 1hydroxy-cyclohexyl-phenyl ketone (photoinitiator) 3 parts by mass of Irgacure (registered
trademark) 184, manufactured by Ciba Specialty Chemicals Co., Ltd., and 1 part by mass of
phosphate ester (KAYARAD (registered trademark) PM-2 manufactured by Nippon Kayaku Co.,
Ltd.) as a metal adhesion improver What was added was applied using a bar coat method so as to
have a wet thickness of 12 μm. Next, this laminate is dried for 1 minute in a hot air oven (Tabai
Espec Corp. PHH-200) at 90 ° C., and then a conveyor type UV irradiation device (ECS-401GX
manufactured by Eye Graphics Co., Ltd.) A high-pressure mercury lamp (4 kw × 1 lamp) was
used to irradiate an irradiation amount of 500 mJ / cm <2> to obtain a laminate in which a resin
made of an ultraviolet curable compound was laminated. Then, the electrode for speakers was
obtained by peeling the base material of this mesh-like metal compound laminated body, and the
conductive layer comprised with the electroconductive part and the resin part.
[0072]
The surface specific resistance values of the obtained speaker electrode before and after the
bending test are 10 Ω / □ and 10.6 Ω / □, and the variation rate of the surface specific
resistance value is 6.0%. ◎ . Moreover, the moire-proof evaluation was also favorable, and was
"(circle)".
[0073]
(Example 5) On the surface on which the conductive part of the reticulated metal compound
laminate 2 is laminated, an aqueous urethane resin dispersion (DYNON Ink Chemical Co., Ltd.
04-05-2019
22
HYDRAN (registered trademark) AP-201 manufactured by Dainippon Ink and Chemicals, Inc.) is
treated The solution diluted to a solid content concentration of 3% by mass was applied by a bar
coating method so as to be Wet 7 μm, and then dried at 170 ° C. for 2 minutes to solidify the
resin portion, to obtain a speaker electrode having a conductive layer.
[0074]
The surface specific resistance values of the obtained speaker electrode before and after the
bending test are 10 Ω / □ and 10.6 Ω / □, and the variation rate of the surface specific
resistance value is 6.0%. ◎ .
Moreover, the moire-proof evaluation was also favorable, and was "(circle)".
[0075]
Comparative Example 1 A commercially available ITO film (surface specific resistance value 170
Ω / □) does not have a mesh-like line, and the surface specific resistance value after a bending
test has a measurement limit (1 × 10 <6> Ω). / □) or more and did not exhibit a surface specific
resistance value.
[0076]
(Comparative Example 2) When a metal porous plate was used as a speaker electrode, good
speaker operation was confirmed, but the structure does not have a network-like line made of a
metal compound on the substrate, It was poor in transparency and flexibility.
[0077]
The present invention relates to a speaker electrode which can reduce the weight of the speaker
and is excellent in transparency and flexibility.
[0078]
DESCRIPTION OF SYMBOLS 1 Network-like line (conductive part) which consists of metal
compounds 2 Substrate 3 Electrode for speakers which has a conductive part and a substrate 4
Resin part 5 Conductive layer 6 Substrate 7 Speaker electrode which has a conductive layer and
a substrate 8 Surface where conductive part exists Electrodes for flex bars 9 speakers installed
on top
04-05-2019
23
04-05-2019
24
1/--страниц
Пожаловаться на содержимое документа