JP6619666B2 - Light transmissive conductive film - Google Patents

Description

  The present invention relates to a light transmissive conductive film having light transparency and conductivity.

  In recent years, touch panel liquid crystal display devices have been widely used in electronic devices such as smartphones, mobile phones, notebook computers, tablet PCs, copiers, and car navigation systems. In such a liquid crystal display device, a light transmissive conductive film in which a transparent conductive layer is laminated on a base film is used. Since the base film is easily damaged, a cured resin layer called a hard coat layer is usually provided on the surface of the base film.

  Patent Document 1 below describes a transparent conductive laminate for a transparent touch panel in which a hard coat layer, a cured resin layer, and a transparent conductive layer are provided on at least one surface of a transparent organic polymer substrate. Patent Document 1 describes that the hard coat layer and the cured resin layer may contain fine particles. Patent Document 1 describes that the hard coat layer has a thickness of 1 μm or more and 10 μm or less.

Japanese Patent No. 5005112

  An electrode used in a liquid crystal display device is formed by patterning a conductive layer, and the reflection intensity by external light differs between a portion where the conductive layer is present and a portion where the conductive layer is not present. Therefore, there is a problem that the pattern of the conductive layer is visually recognized (problem of bone appearance). In particular, as in Patent Document 1, when the thickness of the hard coat layer is large, the color difference due to optical reflection increases, and bone appearance tends to be prominent.

  In addition, as in Patent Document 1, when the hard coat layer or the cured resin layer contains fine particles, there is a problem that white scattering occurs and display light is difficult to see (problem of white blur).

  An object of the present invention is to provide a light-transmitting conductive film in which a pattern of a conductive layer is hardly visible and white scattering is hardly generated.

  The light-transmitting conductive film according to the present invention is a light-transmitting and conductive film having a first main surface and a second main surface facing the first main surface. A base film having light transmittance and a light transmitting property, a conductive layer laminated on the first main surface side of the base film and having light transmittance, and a first film of the base film. 2 and a hard coat layer containing a filler, the thickness of the hard coat layer is 1 μm or less, and the ratio of the average particle diameter of the filler to the thickness of the hard coat layer Is more than 1/2 and 1 or less.

  In a specific aspect of the light transmissive conductive film according to the present invention, the filler does not protrude on the surface of the hard coat layer.

  In a specific aspect of the light-transmitting conductive film according to the present invention, the hard coat layer has a third main surface in contact with the base film and a fourth main surface facing the third main surface. The filler is unevenly distributed so as to be present on one side of the third and fourth main surfaces in the thickness direction of the hard coat layer. Preferably, the filler is unevenly distributed so as to be present on the third main surface side in the thickness direction of the hard coat layer.

  In a specific aspect of the light-transmitting conductive film according to the present invention, the hard coat layer has a third main surface in contact with the base film and a fourth main surface facing the third main surface. The arithmetic mean roughness Ra of the third main surface is less than 10 nm.

  The light-transmitting conductive film according to the present invention can be suitably used for a liquid crystal display device.

  The light-transmitting conductive film according to the present invention includes a base film having optical transparency, a conductive layer laminated on the first main surface side of the base film and having optical transparency, And a hard coat layer that is laminated on the second main surface side of the material film and includes a filler.

  The thickness of the hard coat layer is 1 μm or less, and the ratio of the average particle diameter of the filler to the thickness of the hard coat layer is more than 1/2 and is 1 or less. Therefore, in the light transmissive conductive film of the present invention, the pattern of the conductive layer is difficult to be visually recognized, and white scattering is hardly generated. Therefore, the light transmissive conductive film of the present invention is excellent in reliability.

Fig.1 (a) is typical sectional drawing of the transparent conductive film which concerns on one Embodiment of this invention, FIG.1 (b) is a model which expands and shows the hard-coat layer of Fig.1 (a). FIG. FIG. 2 is a schematic partial cross-sectional view showing an enlarged hard coat layer in a modification of the light transmissive conductive film according to one embodiment of the present invention.

  Hereinafter, the present invention will be clarified by describing specific embodiments of the present invention with reference to the drawings.

  Fig.1 (a) is typical sectional drawing of the transparent conductive film which concerns on one Embodiment of this invention, FIG.1 (b) is a model which expands and shows the hard-coat layer of Fig.1 (a). FIG. In FIG. 1, the length, width, thickness, shape, and amount of filler of each layer and filler are appropriately changed from the actual size and shape for convenience of illustration.

  A light transmissive conductive film 1 shown in FIGS. 1A and 1B includes a base film 2, a conductive layer 3, and a hard coat layer 4. The light transmissive conductive film 1 is a film having light transparency and conductivity.

  The base film 2 has a first main surface 2a (surface) and a second main surface 2b (surface). The first main surface 2a and the second main surface 2b are opposed to each other. The first main surface 2 a is in contact with the conductive layer 3. The first main surface 2a is a surface on which the conductive layer 3 is disposed. Second main surface 2 b is in contact with hard coat layer 4. The second main surface 2b is a surface on which the hard coat layer 4 is disposed. The base film 2 is formed of a material having high light transmittance.

  A conductive layer 3 is partially laminated on the first main surface 2 a of the base film 2. The conductive layer 3 is formed of a material having high light transmittance and high conductivity. The light transmissive conductive film 1 has a portion with the conductive layer 3 and a portion without the conductive layer 3 on the first main surface 2 a of the base film 2. In the present invention, the conductive layer 3 may be provided on the first main surface 2a of the base film 2 via another layer. As the other layer, for example, a hard coat layer formed of the same material as the hard coat layer 4 can be provided. Moreover, the material of the hard coat layer provided as the other layer may be different from the material of the hard coat layer 4.

  A hard coat layer 4 is laminated on the second main surface 2 b of the base film 2. The hard coat layer 4 has a third main surface 4a (surface) and a fourth main surface 4b (surface). The third main surface 4 a is in contact with the base film 2. The 3rd main surface 4a is the surface where the base film 2 is arrange | positioned. The fourth main surface 4b is a mounting surface mounted on a liquid crystal display device or the like. In the present invention, the hard coat layer 4 may be provided on the second main surface 2b of the base film 2 via another layer.

  Hard coat layer 4 includes a resin portion 5 and a filler 6. The resin part 5 is formed of a cured resin. By providing the hard coat layer 4, the surface of the base film 2 can be protected. Moreover, the fine crack which exists in the base film 2 can be filled, and the surface of the base film 2 can be planarized. Since the hard coat layer 4 is provided, the light transmissive conductive film 1 is excellent in scratch resistance.

  The filler 6 is disposed inside the hard coat layer 4. The filler 6 is arranged so that the third and fourth main surfaces 4 a and 4 b of the hard coat layer 4 do not protrude by the filler 6. The filler 6 does not protrude on the third and fourth main surfaces 4 a and 4 b of the hard coat layer 4. On the third and fourth main surfaces 4 a and 4 b of the hard coat layer 4, no protruding portion due to the filler 6 is formed. The hard coat layer 4 does not have a protruding portion in which the filler 6 protrudes from the third and fourth main surfaces 4a and 4b. Therefore, the third and fourth main surfaces 4a and 4b of the hard coat layer 4 are smooth, and the light transmissive conductive film 1 hardly causes white scattering.

  In the present invention, some of the fillers 6 may protrude from the third and fourth main surfaces 4a and 4b. From the viewpoint of further suppressing white scattering, it is preferable that all the fillers 6 do not protrude. When some of the fillers 6 protrude from the third and fourth main surfaces 4a and 4b, when the total number of fillers 6 is 100%, the number of protruding fillers 6 is preferably 5%. Below, more preferably 1% or less, still more preferably 0.5% or less, and most preferably 0.1% or less. The fewer fillers 6 are protruding, the more white scattering is suppressed.

  The filler 6 is unevenly distributed in the thickness direction of the hard coat layer 4 so as to be present on the third main surface 4a side. Specifically, in the hard coat layer 4, the content of the filler 6 in the region having a thickness of 1/2 on the third main surface 4a side is in the region having a thickness of 1/2 on the fourth main surface 4b side. More than filler content. Note that the presence position of the filler 6 is determined based on the center of the filler 6.

  The end of the filler 6 on the third main surface 4 a side is continuous with the third main surface 4 a of the hard coat layer 4. The end of the filler 6 on the third main surface 4a side is present at the position of the third main surface 4a. The end of the filler 6 on the fourth main surface 4 b side may be continuous with the fourth main surface 4 b side of the hard coat layer 4. Since the third main surface 4a is in contact with the base film 2 and the surface of the hard coat layer 4 is more difficult to protrude due to the filler 6, the end of the filler 6 on the third main surface 4a side is the third main surface 4a. It is preferable to be continuous with the main surface 4a. Further, the end of the filler 6 opposite to the third main surface 4a side is arranged on the fourth main surface 4b side with respect to the center in the thickness direction of the hard coat layer 4 indicated by a broken line in FIG. Has been.

  The thickness of the hard coat layer 4 is 1 μm or less. Even if the thickness of the hard coat layer 4 is 1 μm or less, in the light-transmitting conductive film 1, the pattern of the conductive layer 3 is difficult to be visually recognized, and the problem of bone appearance hardly occurs. Further, the thickness of the hard coat layer 4 is larger than the average particle diameter of the filler 6 or the same thickness as the average particle diameter of the filler 6. Therefore, in the light transmissive conductive film 1, white scattering is suppressed and white blurring is difficult.

  More specifically, in the light-transmissive conductive film 1, the ratio of the average particle diameter of the filler 6 to the thickness of the hard coat layer 4 (average particle diameter of the filler 6 / thickness of the hard coat layer 4) exceeds 1/2. 1 or less. Since the ratio (average particle diameter of the filler 6 / thickness of the hard coat layer 4) exceeds the lower limit and is equal to or lower than the upper limit, in the light transmissive conductive film 1, the pattern of the conductive layer 3 is difficult to be visually recognized. White scattering hardly occurs. The average particle diameter means an average volume particle diameter, and can be measured by a laser diffraction / scattering particle diameter distribution measuring apparatus. In Examples described later, the average volume particle size was measured with a particle size distribution measuring device (manufactured by Horiba, Ltd., product number: LA-950).

  From the viewpoint of making the pattern of the conductive layer 3 less visible and further suppressing white scattering, the ratio (average particle diameter of the filler 6 / thickness of the hard coat layer 4) is 0.6 or more. Preferably, it is 0.9 or less.

  The arithmetic average roughness Ra measured in accordance with JIS B0601: 1994 of the third and fourth main surfaces 4a and 4b of the hard coat layer 4 is preferably less than 10 nm, and more preferably less than 8 nm. Preferably, it is less than 6 nm. When the arithmetic average roughness Ra is less than the above upper limit, white scattering can be further suppressed.

  FIG. 2 is a schematic partial cross-sectional view showing an enlarged hard coat layer in a modification of the light transmissive conductive film according to one embodiment of the present invention.

  As shown in FIG. 2, in the light transmissive conductive film of the modified example, fillers 6A are randomly arranged in the thickness direction of the hard coat layer 4A. Hard coat layer 4A includes a resin portion 5A and a filler 6A. The filler 6A is disposed on either side of the third and fourth main surfaces 4a and 4b from the center in the thickness direction of the hard coat layer 4A indicated by a broken line in FIG. The filler 6A is not unevenly distributed on either side of the third and fourth main surfaces 4a and 4b in the hard coat layer 4A. Moreover, the edge part of the both sides of the hard-coat layer 4 of the filler 6A is not connected with any of the 3rd and 4th main surfaces 4a and 4b. Also in this modification, the filler 6A is arranged so that the third and fourth main surfaces 4a and 4b of the hard coat layer 4A do not protrude by the filler 6A.

  As in this modification, the filler 6A may be randomly arranged in the thickness direction of the hard coat layer 4A, but the filler 6A is present on the third main surface 4a side in the thickness direction. It may be unevenly distributed or may be unevenly distributed so as to be present on the fourth main surface 4b side in the thickness direction.

  Since the light-transmitting conductive film according to the present invention has the above-described configuration, the pattern of the conductive layer is hardly visible and white scattering can be suppressed. In the light-transmitting conductive film according to the present invention, the problem of bone appearance and the problem of white blurring hardly occur. Therefore, the light transmissive conductive film of the present invention is excellent in reliability.

  Since the light-transmitting conductive film of the present invention is difficult to visually recognize the pattern of the conductive layer and can suppress white scattering, when used in a liquid crystal display device, the visibility of display light can be improved. Therefore, the light transmissive conductive film of the present invention can be suitably used for a liquid crystal display device.

  In particular, in the touch panel, when the pattern of the conductive layer is visually recognized and white scattering occurs, the display quality and usability are greatly adversely affected. Since the pattern of the conductive layer is hardly visible and white scattering can be suppressed, the light-transmitting conductive film of the present invention can be particularly suitably used for a touch panel.

  Hereinafter, other details of the light-transmitting conductive film according to the present invention will be described.

(Base film)
The base film preferably has high light transmittance. Accordingly, the material of the base film is not particularly limited. For example, polyolefin, polyethersulfone, polysulfone, polycarbonate, cycloolefin polymer, polyarylate, polyamide, polymethyl methacrylate, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate. Examples thereof include phthalate, triacetyl cellulose, and cellulose nanofiber. The base film is preferably formed of a resin. These may be used alone or in combination.

  Although the thickness of a base film is not specifically limited, It is preferable that it is 5 micrometers or more, It is more preferable that it is 20 micrometers or more, It is preferable that it is 188 micrometers or less, It is more preferable that it is 125 micrometers or less. When the thickness of the base film is not less than the above lower limit and not more than the above upper limit, the pattern of the conductive layer can be made even less visible.

  Moreover, as for the light transmittance of a base film, it is preferable that the average transmittance | permeability in the visible light region with a wavelength of 380-780 nm is 85% or more, and it is more preferable that it is 90% or more.

  The refractive index of the base film is preferably 1.40 or more, more preferably 1.50 or more, preferably 1.70 or less, and more preferably 1.60 or less. When the refractive index of the base film is not less than the above lower limit and not more than the above upper limit, the pattern of the conductive layer can be made more difficult to be visually recognized.

  Further, the base film may contain various stabilizers, ultraviolet absorbers, plasticizers, lubricants, or colorants.

(Conductive layer)
The conductive layer is made of a light-transmitting conductive material. Although it does not specifically limit as said electroconductive material, For example, Sn type | system | groups, such as In type | system | group oxides, such as IZO (indium zinc oxide) and ITO (indium tin oxide), SnO2, FTO (fluorine dope tin oxide). Oxides, Zn-based oxides such as AZO (aluminum zinc oxide), GZO (gallium zinc oxide), sodium, sodium-potassium alloy, lithium, magnesium, aluminum, magnesium-silver mixture, magnesium-indium mixture, aluminum Examples include lithium alloys, Al / Al ₂ O ₃ mixtures, Al / LiF mixtures, metals such as gold, CuI, Ag nanowires (AgNW), carbon nanotubes (CNT), and conductive transparent polymers. These may be used alone or in combination.

From the viewpoint of further increasing the conductivity and further increasing the light transmittance, the conductive material is selected from In-based oxides such as IZO (indium zinc oxide) and ITO (indium tin oxide), SnO ₂ , FTO. Sn-based oxides such as (fluorine-doped tin oxide), Zn-based oxides such as AZO (aluminum zinc oxide) and GZO (gallium zinc oxide) are preferable, and ITO (indium tin oxide) is preferable. Is more preferable.

  Although the thickness of a conductive layer is not specifically limited, It is preferable that it is 12 nm or more, It is more preferable that it is 17 nm or more, It is preferable that it is 50 nm or less, It is more preferable that it is 30 nm or less.

  When the thickness of a conductive layer is more than the said minimum, the electroconductivity of a transparent conductive film can be improved further. When the thickness of the conductive layer is not more than the above upper limit, the pattern of the conductive layer can be made more difficult to be visually recognized, and the thickness can be further reduced.

  Further, the light transmittance of the conductive layer is preferably 85% or more, more preferably 90% or more, in the visible light region.

(Hard coat layer)
The hard coat layer is composed of a resin portion and a filler.

  The thickness of the hard coat layer is 1 μm or less. The thickness of the hard coat layer is preferably 0.1 μm or more, more preferably 0.4 μm or more, preferably less than 1 μm, more preferably 0.9 μm or less, and 0.8 μm. More preferably, it is as follows. By setting the thickness of the hard coat layer to the above lower limit or more and the above upper limit or less, the pattern of the conductive layer can be made more difficult to be visually recognized, and white scattering can be further suppressed.

Resin part;
The resin part of the hard coat layer can be formed by the resin. The resin part is preferably formed of a cured resin. As the curable resin, a thermosetting resin, an active energy ray curable resin, or the like can be used. From the viewpoint of productivity and economy, the curable resin is preferably an ultraviolet curable resin.

  Examples of the photocurable monomer for forming the ultraviolet curable resin include 1,6-hexanediol diacrylate, 1,4-butanediol diacrylate, ethylene glycol diacrylate, diethylene glycol diacrylate, and tetraethylene glycol diacrylate. , Tripropylene glycol diacrylate, neopentyl glycol diacrylate, 1,4-butanediol dimethacrylate, poly (butanediol) diacrylate, tetraethylene glycol dimethacrylate, 1,3-butylene glycol diacrylate, triethylene glycol diacrylate Such as triisopropylene glycol diacrylate, polyethylene glycol diacrylate and bisphenol A dimethacrylate Triacrylate compounds such as trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, pentaerythritol monohydroxytriacrylate and trimethylolpropane triethoxytriacrylate; of pentaerythritol tetraacrylate and di-trimethylolpropane tetraacrylate And tetraacrylate compounds such as dipentaerythritol (monohydroxy) pentaacrylate. As the ultraviolet curable resin, a polyfunctional acrylate having 5 or more functional groups may be used. These polyfunctional acrylates may be used alone or in combination. Moreover, you may add a photoinitiator, a photosensitizer, a leveling agent, a diluent, etc. to the said polyfunctional acrylate compound.

Fillers;
The filler is not particularly limited, but for example, metal oxides such as silica, iron oxide, aluminum oxide, zinc oxide, titanium oxide, silicon dioxide, antimony oxide, zirconium oxide, tin oxide, cerium oxide, and indium-tin oxide. Particles; or resin fine particles mainly composed of silicone, (meth) acryl, styrene, melamine, or the like can be used. More specifically, resin fine particles such as crosslinked poly (meth) methyl acrylate can be used. These may be used alone or in combination.

  The absolute value of the difference between the refractive index of the filler and the refractive index of the resin part of the hard coat layer is preferably 0.01 or more, more preferably 0.03 or more, and 0.05 or more. More preferably. When the absolute value of the refractive index difference is equal to or greater than the lower limit, the pattern of the conductive layer can be made more difficult to visually recognize.

  The absolute value of the difference between the refractive index of the filler and the refractive index of the resin part of the hard coat layer is preferably 0.4 or less, more preferably 0.3 or less, and 0.2 or less. More preferably. When the absolute value of the refractive index difference is not more than the above upper limit, white scattering can be further suppressed.

  In 100% by weight of the hard coat layer, the filler content is preferably 0.01% by weight or more, more preferably 0.03% by weight or more, and further preferably 0.05% by weight or more. Preferably, it is 1% by weight or less, more preferably 0.5% by weight or less, and further preferably 0.3% by weight or less. When content of a filler is more than the said minimum, it can make it difficult to visually recognize the pattern of a conductive layer. When the filler content is not more than the above upper limit, white scattering can be further suppressed.

  The average particle size of the filler is preferably 0.2 μm or more, more preferably 0.4 μm or more, preferably 1 μm or less, more preferably less than 1 μm, and 0.9 μm or less. More preferably, it is 0.8 μm or less.

  When the average particle diameter of a filler is more than the said minimum, it can make it difficult to visually recognize the pattern of a conductive layer. When the average particle diameter of the filler is not more than the above upper limit, white scattering can be further suppressed.

(Production method)
The manufacturing method of a light transmissive conductive film is not specifically limited. As a manufacturing method of a light transmissive conductive film, the following methods are mentioned, for example.

  First, a conductive layer is formed on the main surface side on one side of the base film. The method for forming the conductive layer is not particularly limited. As a method for forming the conductive layer, for example, a method for etching a metal film formed by vapor deposition or sputtering, various printing methods such as screen printing or ink jet printing, and a known patterning method such as a photolithography method using a resist, etc. Can be used.

  Next, a hard coat layer is formed on the other main surface side of the base film. Specifically, when an ultraviolet curable resin is used as the resin, first, a photocurable monomer, a photoinitiator, and a filler are stirred in a diluent to prepare a coating liquid. The obtained coating liquid is applied onto a substrate film, and the resin is cured by irradiating with ultraviolet rays to produce a hard coat layer.

  In the present invention, the production order of the conductive layer and the hard coat layer is not particularly limited, but it is preferable to form the hard coat layer on the base film before the conductive layer.

  Hereinafter, the present invention will be described in more detail based on specific examples. The present invention is not limited to the following examples.

Example 1
Preparation of coating solution;
97 parts by weight of urethane acrylate oligomer as a photocurable monomer, 100 parts by weight of a mixed solvent of toluene and methyl isobutyl ketone (MIBK) as a diluent, and Irgacure 194 (manufactured by Ciba Specialty Chemicals) as a photoinitiator 3 A coating solution is prepared by mixing and stirring 0.03 part by weight of a crosslinked polymethyl methacrylate (made by Sekisui Plastics Co., Ltd., trade name: Techpolymer, average particle size: 0.4 μm) as a filler. did.

Formation of a hard coat layer;
The prepared coating solution was applied on the main surface on one side of a 23 μm PET film by a vapor deposition method and dried. After drying, the resin was cured by irradiating UV light of 200 mJ / cm ^{2 with} a high pressure mercury lamp to form a hard coat layer having a thickness of 0.4 μm. The arithmetic mean roughness Ra of the third main surface in contact with the base film of the hard coat layer was 5 nm.

Forming a conductive layer;
An ITO layer (conductive layer) was deposited on the main surface on the other side of the hard coat layer of the film on which the hard coat layer was formed. A dry film resist was applied to the PET film on which the ITO layer was deposited, and exposure and development were performed. Subsequently, etching, peeling, washing, and drying steps were performed in this order, and the ITO layer was patterned to obtain a light-transmitting conductive film.

(Examples 2-18 and Comparative Examples 1-5)
Except that the average particle diameter of the filler, the amount of filler added, the thickness of the hard coat layer, and the arithmetic average roughness Ra of the third main surface in contact with the base film of the hard coat layer are set as shown in Table 1 below. Obtained a light-transmissive conductive film in the same manner as in Example 1.

(Examples 19 to 22 and Comparative Examples 6 to 7)
The type of filler is changed to spherical silica (SFP-20M manufactured by Denki Kagaku Kogyo Co., Ltd., average particle size 0.3 μm), and the amount of filler added, the thickness of the hard coat layer, and the third film in contact with the base film of the hard coat layer A light-transmitting conductive film was obtained in the same manner as in Example 1 except that the arithmetic average roughness Ra of the main surface was set as shown in Table 2 below.

<Evaluation>
The following evaluation was performed about the light transmissive conductive film obtained in Examples 1-22 and Comparative Examples 1-7. The results are shown in Tables 1 and 2 below.

(1) Evaluation of bone appearance About the obtained light-transmitting conductive film, bone appearance was evaluated according to the following criteria.

[Judgment criteria for bone appearance evaluation]
OO: The pattern of the conductive layer is not visually recognized when irradiated with any of LED light, fluorescent light, and white light.
◯: When the LED light is irradiated, the conductive layer pattern is visually recognized. However, when either the fluorescent lamp or the white lamp is irradiated, the conductive layer pattern is not visually recognized.
○: When the LED light and the fluorescent lamp are irradiated, the conductive layer pattern is visually recognized. However, when the white lamp is irradiated, the conductive layer pattern is not visually recognized.
X: The conductive layer pattern is visually recognized when any of the LED light, the fluorescent lamp, and the white lamp is irradiated.

(2) Evaluation of graininess (evaluation of white blur)
The obtained light transmissive conductive film was irradiated with a fluorescent lamp, and the graininess was evaluated (evaluation of white blur) according to the following criteria.

[Judgment criteria for graininess evaluation]
OO: A fluorescent lamp is reflected on the surface of the light transmissive conductive film.
○: The surface of the light-transmitting conductive film is slightly white and blurred.
X: The surface of the light-transmitting conductive film is blurred in white.

DESCRIPTION OF SYMBOLS 1 ... Light-transmissive conductive film 2 ... Base film 2a ... 1st main surface 2b ... 2nd main surface 3 ... Conductive layer 4, 4A ... Hard-coat layer 4a ... 3rd main surface 4b ... 4th main Surface 5, 5A ... Resin part 6, 6A ... Filler

Claims (6)

A film having optical transparency and conductivity,
A base film having a first main surface and a second main surface facing the first main surface and having light transmittance;
A conductive layer laminated on the first main surface side of the base film and having light transparency;
A hard coat layer that is laminated on the second main surface side of the base film and contains a filler;
The filler has an average particle size of less than 1 μm,
The hard coat layer has a thickness of 1 μm or less,
The light-transmitting conductive film, wherein a ratio of an average particle diameter of the filler to a thickness of the hard coat layer is more than 1/2 and 1 or less.   The light-transmitting conductive film according to claim 1, wherein the filler does not protrude on the surface of the hard coat layer. The hard coat layer has a third main surface in contact with the base film, and a fourth main surface facing the third main surface;
3. The light transmissive property according to claim 1, wherein the filler is unevenly distributed so as to be present on one side of the third and fourth main surfaces in the thickness direction of the hard coat layer. Conductive film.   The light-transmitting conductive film according to claim 3, wherein the filler is unevenly distributed so as to exist in a large amount on the third main surface side in the thickness direction of the hard coat layer. The hard coat layer has a third main surface in contact with the base film, and a fourth main surface facing the third main surface;
The light-transmissive conductive film according to claim 1, wherein the arithmetic average roughness Ra of the third main surface is less than 10 nm. The light-transmitting conductive film according to claim 1, which is used for a liquid crystal display device.

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