JP6474383B2 - Anti-fouling optical member and touch panel display - Google Patents

Description

  The present invention relates to an optical member with an antifouling film and a touch panel display, and is particularly suitable for an optical member with an antifouling film formed by laminating an antifouling film on the surface of a base film formed on a substrate. .

In order to make it easy to wipe off dirt such as fingerprints adhering to a glass or plastic base material, a technique for providing an antifouling performance by applying an oil-repellent film to the base material is known.
For example, the antireflection member described in Patent Document 1 (Japanese Patent Application Laid-Open No. 2006-58728) is described as being provided with a layer having antifouling property as the uppermost layer and applicable to the surface of a display screen of a display.

Here, the antireflection member described in Patent Document 1 is an antireflection member comprising a base material, a hard coat layer, and an antireflection layer, and the surface roughness Ra of the hard coat layer is represented by the following formulas (1) and (2): The condition indicated by is satisfied.
Ra1 = 1.4 nm to 13 nm (area 5 μm × 5 μm) (1)
Ra2 = 2.2 nm to 26 nm (area 20 μm × 20 μm) (2)
Ra (arithmetic mean roughness) is an index representing the surface roughness of the sample, and is a value defined in JIS-B0601: 2001. In the case of a nanoscale minute surface shape, Ra or the like can be quantified by using an atomic force microscope (AFM).

In Patent Document 1, by satisfying the above formulas (1) and (2), even when the thickness of the layer (antireflection layer or part thereof) in contact with the hard coat layer is thin, the continuity of the layer is given. It is described that the adhesion can be improved without hindering.
Further, Patent Document 1 describes that an antireflection member having a moderately rough surface of the hard coat layer has very high scratch resistance.

  Here, in Patent Document 1, the antifouling property is evaluated by a contact angle measurement experiment, the adhesion property is evaluated by a cross-cut method, and the scratch resistance is rubbed with steel wool 20 times. Evaluation is made by visual judgment of the presence or absence of scratches. According to the evaluation described in Patent Document 1, the value of the surface roughness Ra of the base film (hard coat layer) on which the antireflection layer including the antifouling layer is formed is expressed by the above formula (1) and It is described that an antireflection member excellent in adhesion and scratch resistance can be obtained by satisfying the range of (2).

On the other hand, the oil-repellent substrate described in Patent Document 2 (Patent No. 50368827) is a touch surface of touch panel type electronic devices such as bank ATMs and ticket vending machines, in addition to various displays, showcases, clocks and instrument cover glasses. It is described that it is applicable.
In Patent Document 2, parameters Ra (center line average roughness), Rz (ten-point average height), and Pv (maximum valley depth) related to the surface roughness of the first film on which the film having oil repellency is formed. The first film is irradiated with energetic particles so as to be in an appropriate range. In Patent Document 2, by setting these parameters to an appropriate range, an appropriate recess is formed on the surface of the first film, and the wear resistance of the oil-repellent film formed thereafter is practically endured. It is described that the level can be improved to the level obtained.
Note that Patent Document 2 discloses that Ra of the first film is preferably 0.1 to 1000 nm, more preferably 1 to 100 nm, and still more preferably 3 to 20 nm. Moreover, the example whose Ra of a 1st film | membrane is 1-13 nm is specifically disclosed as an oil-repellent base material which is excellent in abrasion resistance.

  Here, in the scratch test described in Patent Document 2, after rubbing the surface of the second film having oil repellency with steel wool, a line is drawn on the test surface (the surface of the second film) with an oil-based magic pen, and the ink Whether or not can be wiped off with a dry cloth. As a result of this scratch test, the oil-repellent substrate described in Patent Document 2 has a maximum scratch count of only about 200 when the surface roughness Ra of the base film (first film) is 1 nm. In contrast, when the Ra value was 2 nm and 3 nm, the maximum number of scratches was 2200, and when the Ra value was 5 nm, the maximum number of scratches was 2800.

JP 2006-58728 A Japanese Patent No. 5036827

However, in the experiment described in Patent Document 1, the antifouling property after rubbing the surface of the antifouling layer (the low refractive index layer constituting the antireflection layer) with steel wool is evaluated (contact angle measurement). Not done. That is, sufficient investigation has not been made on the durability of the antifouling performance. Therefore, when the antifouling film (low refractive index layer constituting the antireflection layer) is formed on the base film (hard coat layer) and the surface of the antifouling film is rubbed with steel wool 20 times, It is unclear whether the antifouling property is ensured without being impaired. In recent years, the market demand for durability of antifouling performance is very high. For example, when applied to the touch surface of a touch panel, the number of times of contact with the antifouling film surface is extremely large. It is not enough to withstand the friction of about once.
In addition, in the invention described in Patent Document 2, when applied to the touch surface of a touch panel where the number of contacts is extremely large, considering the practical wear resistance, it is still not enough to withstand a maximum of 2800 times of friction. It can be said that it is insufficient.

  As described above, the inventions described in Patent Documents 1 and 2 are still not sufficient for long-term durability. In particular, in recent years, applications such as touch panel displays such as smartphones are frequently exposed to shock and friction, and therefore, the demand from the market for durability of antifouling performance has become very high. Therefore, higher durability is required, for example, capable of withstanding a more severe steel wool friction test.

Accordingly, the present invention has been made to solve the above-described problems, and provides an antifouling film-coated optical member and a touch panel display that have improved wear resistance and exhibit excellent antifouling properties over a long period of time. For the purpose.

In order to solve the above-described problem, an optical member with an antifouling film according to an embodiment of the present invention is formed by vapor deposition on a base material, a base film formed on the base material, and a surface of the base film. An antifouling film-coated optical member having an antifouling film, wherein the surface roughness Ra of the base film is 0.76 nm or less, and the film thickness of the antifouling film is 10 to 20 nm. To do.
In order to solve the above-described problems, an optical member with an antifouling film according to an embodiment of the present invention is obtained by vapor deposition on a base material, a base film formed on the base material, and a surface of the base film. An optical member with an antifouling film having a formed antifouling film, wherein the surface roughness Ra of the base film is 0.36 nm or less.
Moreover, in order to solve an above-described subject, the touchscreen type display in one Embodiment of this invention is equipped with the optical member with an antifouling film in one embodiment of the above-mentioned this invention.
Moreover, the manufacturing method of the optical member with an antifouling film in one embodiment of the present invention includes a step of forming a base film having a surface roughness Ra of 0.76 nm or less on a substrate, and a surface of the base film. And a step of forming an antifouling film having a thickness of 10 to 20 nm by vapor deposition.
Moreover, the manufacturing method of the optical member with an antifouling film according to one embodiment of the present invention includes a step of forming a base film having a surface roughness Ra of 0.36 nm or less on a substrate, and a surface of the base film. And a step of forming an antifouling film by vapor deposition.
Moreover, the manufacturing method of the touchscreen type display in one Embodiment of this invention WHEREIN: The antifouling film-coated optical member produced by the manufacturing method of the above-mentioned antifouling film-coated optical member in one Embodiment of this invention is used as a touchscreen display. The display portion is provided.

ADVANTAGE OF THE INVENTION According to this invention, abrasion resistance improves more and the antifouling film-coated optical member and touch panel type display which exhibit the antifouling property excellent over the long term can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic which shows the structure in 1st Embodiment of the optical member with an antifouling film which concerns on this invention, Comprising: Of the optical member with an antifouling film in which the base film is formed through the other film | membrane on the base material A configuration example is shown. FIG. 5 is a schematic diagram illustrating a configuration of an optical member with an antifouling film according to a second embodiment of the present invention, and is a diagram illustrating a configuration example of an optical member with an antifouling film in which a base film is directly formed on a substrate. It is. It is the schematic which shows the structure in one Embodiment of the touchscreen type display which concerns on this invention.

<Optical member with antifouling film>
An optical member with an antifouling film according to the present invention is an optical member with an antifouling film in which a base film is formed on a base material and an antifouling film is formed on the surface of the base film, and the surface roughness of the base film is The thickness Ra is 0.76 nm or less.

Prior to specific description of the configuration of the optical member with an antifouling film according to the present invention, in order to understand the present invention, first, estimation of a mechanism that exhibits the effect will be described below.

In the present invention, the surface roughness Ra of the underlying film is set within a range of 0.76 nm or less, and the underlying film is smoothed by sufficiently reducing the unevenness, so that the silanol groups on the surface of the underlying film are substantially on the same plane. It can be arranged at a close position. Therefore, when the antifouling film is formed on the surface of the undercoat film, the silanol group on the surface of the undercoat film and the molecules of the antifouling film easily react in the process of the silane coupling reaction, that is, hydrogen. It is assumed that a siloxane bond stronger than the bond occurs.

Here, the silane coupling reaction means that the alkoxysilane component molecule of the antifouling film is hydrolyzed to form a hydrogen bond with the silanol group on the surface of the undercoat film, and a strong covalent bond to the undercoat film by dehydration condensation, that is, siloxane. It forms a bond and exhibits strong adhesion. Since the distance at which individual molecules of the antifouling film components can chemically bond with the silanol groups of the undercoat is limited, it is more likely that the silanol groups on the surface of the undercoat are located closer to the same plane. It becomes easy to combine with the reactive group. However, if the surface roughness of the undercoat film is large, the position of the silanol group in the undercoat film will deviate from the proper position, leaving a weak hydrogen bond without forming a siloxane reaction with the molecules of the antifouling film. An existing part is created.

On the other hand, in the present invention, the surface of the base film can be smoothed, and the silanol groups on the base film can be arranged at positions close to substantially the same plane. Therefore, it is presumed that a siloxane bond can easily occur as described above. Thereby, stronger adhesiveness is obtained between the base film and the antifouling film, and the wear resistance of the optical member with the antifouling film can be greatly improved.

  Next, an embodiment of the optical member with an antifouling film according to the present invention will be described with reference to the drawings.

<< First Embodiment >>
FIG. 1 is a schematic diagram showing the configuration of a first embodiment of an optical member with an antifouling film according to the present invention, wherein the antifouling film has a base film formed on the base material via another film. The structural example of an attached optical member is shown.
As shown in FIG. 1, the antifouling film-coated optical member of the present embodiment has a low refractive index material film 14a, 14c made of a low refractive index material and a high refractive index material made of a high refractive index material on a substrate 11. In this configuration, a laminated film 14 in which the films 14b and 14d are alternately laminated is formed. The antifouling film 13 is formed on the surface of the base film 12 which is a film made of a low refractive index material provided on the laminated film 14. The laminated film 14 and the base film 12 exhibit an antireflection function (the laminated film 14 and the base film 12 constitute an antireflection film).
FIG. 1 schematically shows the film configuration of the optical member with an antifouling film, and the actual thicknesses of the base material 11, the laminated film 14, the base film 12, and the antifouling film 13 are expressed in an accurate ratio. It was n’t.

(Substrate 11)
The substrate 11 only needs to be capable of laminating and forming the base film 12 and the antifouling film 13 and the like, and is made of, for example, glass or plastic. When the antifouling film-coated optical member is used for a touch panel display or the like, the substrate is preferably capable of transmitting visible light or light having a specific wavelength.

(Laminated film 14)
As shown in FIG. 1, in the laminated film 14, the films 14a and 14c laminated odd-numbered from the substrate 11 side are made of a low refractive index material, and the films 14b and 14d laminated even-numbered are highly refracted. Made of rate material.
In the present embodiment, the base film 12 is also made of a low refractive index material, like the low refractive index material films 14 a and 14 c, and is laminated on the laminated film 14 and exhibits an antireflection function together with the laminated film 14. In this embodiment, since the laminated film 14 has four layers as an example, the base film 12 for forming the antifouling film 13 is a low refractive index material.

Examples of the low refractive index material include SiO ₂ (silicon dioxide) and Al ₂ O ₃ added SiO ₂ (alumina added silicon dioxide). However, the present invention is not limited to this.
Examples of the high refractive index material include alumina-containing titanium oxide-lanthanum oxide-based mixed materials, other mixed oxides mainly composed of titanium oxide, niobium oxide, mixed materials mainly composed of niobium oxide, and the like. However, the present invention is not limited to this.

There are no particular restrictions on the film thickness of the laminated film 14 and each film constituting the laminated film 14, but for example, the film thickness of each film constituting the laminated film 14 is 10 to 200 nm, and a necessary number of layers are laminated and laminated. The membrane 14 can be configured.
The laminated film 14 in this embodiment has a four-layer structure (a five-layer antireflection film structure including the antifouling film 13 that exhibits an antireflection function), but the present invention is not limited to this. Instead, the number of layers may be any number.

  Further, in the present embodiment, the laminated film 14 is provided as a part of the antireflection film formed by alternately laminating the low refractive index layer and the high refractive index layer as described above. It is not limited at all. For example, at least one film having a function selected from other filters, mirrors, antistatics and the like may be formed between the base material 11 and the base film 12.

(Undercoat 12)
The undercoat film 12 is a layer serving as an undercoat for forming the antifouling film 13, and an adhesion between the antifouling film 13 and a layer provided in the lower layer of the undercoat film 12 (in this embodiment, the laminated film 14). It makes the quality good.
In the present embodiment, in order to further improve the wear resistance of the antifouling film 13 formed on the surface of the base film 12, the base film 12 is formed so that its surface roughness Ra is 0.76 nm or less, An antifouling film 13 is formed on the surface of the base film 12 by vapor deposition (for example, vacuum vapor deposition). The present invention is not limited to the vapor deposition process, and the antifouling film 13 may be formed by a production method other than the vapor deposition process, such as a dipping method, a coating method, a spray method, or a spin coating method.
When the surface roughness Ra exceeds 0.76 nm, the wear resistance is deteriorated, and the excellent antifouling property is not exhibited over a long period of time, which is not preferable.

  In order to achieve a surface roughness Ra of 0.76 nm or less, various factors such as various manufacturing conditions and conditions of members other than the base film 12 influence, and these can be adjusted to a suitable range. is necessary. For example, the film formation speed of the base film 12 is 0.5 to several liters / sec, that is, the film formation speed is slower than usual, the thickness of the base film 12 is adjusted, Adjustment of temperature, smoothing of the surface roughness of the substrate 11, and the like are necessary to achieve a surface roughness Ra of 0.76 nm or less. In addition, ion assist that irradiates ions while forming the base film 12 may be performed. At this time, it is desirable to adjust the ion assist conditions because the surface roughness Ra can also be affected. By adjusting such various conditions, the base film 12 having a surface roughness Ra of 0.76 nm or less is obtained.

  Although there is no restriction | limiting in particular about the film thickness of the base film 12, For example, they are 2 nm-150 nm, Preferably it is 5-125 nm. As the film thickness of the base film 12 increases, the surface roughness Ra tends to increase.

The material for forming the base film 12 is preferably SiO _2, but may be any substance having a hydroxyl group on the surface. For example, a metal oxide thin film such as an ITO film having a hydroxyl group on the surface may be used. Preferably, a film of about ₂ to 3 nm of SiO ₂ is formed on a metal oxide film such as an ITO film.

  In the present invention, the surface roughness Ra of the base film 12 is 0.25 nm or more. When the surface roughness Ra is less than 0.25 nm, the unevenness is further reduced, and a smoother undercoat film can be obtained, while the productivity is deteriorated. Further, even when the surface roughness Ra is less than 0.25 nm, noise is generated during measurement, causing variations, and there is a problem that a measurement result with good accuracy cannot be obtained.

Method for measuring surface roughness Ra Surface roughness Ra is measured using an atomic force microscope (manufactured by Hitachi High-Tech Science, SPI3800N) under the conditions of a measurement scale of 2 μm × 2 μm, a spring constant of 15 N / m, and a resonance frequency of 110-150 kHz. And measured.

(Anti-fouling film 13)
The antifouling film 13 is formed for the purpose of preventing fingerprint adhesion on the surface of the laminated film 14 or the base film 12, improving slipperiness, improving dirt wiping property, and preventing water stains.
Further, the antifouling film 13 is made of, for example, a molecule having alkoxysilane, and is preferably made of a fluorine-based compound having alkoxysilane. As the fluorine-based compound, for example, a perfluoroalkyl ether compound represented by the following formula is used.

（式中、Ｒｆはパーフルオロアルキルエーテル基、Ｘは加水分解性基を複数有する加水分解性基含有シランを含む有機基、ＹはＲｆ基とＸ基とを連結する有機基である。）

(In the formula, Rf is a perfluoroalkyl ether group, X is an organic group containing a hydrolyzable group-containing silane having a plurality of hydrolyzable groups, and Y is an organic group linking the Rf group and the X group.)

X is an organic group containing a hydrolyzable group-containing silyl group having a plurality of hydrolyzable groups, preferably 2 to 18, more preferably 2 to 9.
Examples of hydrolyzable groups include alkoxy groups having 1 to 10 carbon atoms such as methoxy group, ethoxy group, propoxy group and butoxy group, alkoxyalkoxy groups having 2 to 10 carbon atoms such as methoxymethoxy group and methoxyethoxy group, and acetoxy groups. Examples thereof include C1-C10 alkenyloxy groups such as C1-C10 acyloxy groups and isopropenoxy groups, halogen groups such as chloro groups, bromo groups and iodo groups, and amino groups. Of these, a methoxy group, an ethoxy group, an isopropenoxy group, and a chloro group are preferable.

  Y is a divalent organic group and is a linking group between the Rf group and the X group. Preferably, an unsubstituted or substituted carbon that may contain one or more structures selected from the group consisting of amide bonds, ether bonds, ester bonds, vinyl bonds, and diorganosylylene groups such as dimethylsilylene groups. A divalent organic group having 2 to 12 carbon atoms, preferably an unsubstituted or substituted divalent hydrocarbon group having 2 to 12 carbon atoms which may contain the above structure.

  More specifically, examples of the fluorine-based compound include trimethoxysilane, dimethoxysilane, triethoxysilane, triisopropenoxysilane, trichlorosilane, and triaminosilane having a perfluoroalkyl ether group. Among these, trimethoxysilane having a perfluoroalkyl ether group is preferable.

  Although there is no restriction | limiting in particular about the film thickness of the antifouling film | membrane 13, For example, it is 10-20 nm. If the film thickness is too thin, sufficient antifouling properties may not be obtained, and if the film thickness is too thick, transparency may be impaired.

<< Second Embodiment >>
FIG. 2 is a schematic diagram showing the configuration of the optical member with an antifouling film according to the second embodiment of the present invention, and the configuration of the optical member with an antifouling film in which a base film is directly formed on a substrate. It is a figure which shows an example.
The optical member with an antifouling film shown in FIG. 2 has a configuration in which a base film 12 is directly formed on a substrate 11. The base film 12 is formed as a single layer using a low refractive index material, and the antifouling film 13 is formed on the surface of the base film 12. In the present embodiment, as an example, the low refractive index material of the base film 12 is assumed to be SiO ₂ .
The optical member with the antifouling film of the present embodiment is different from the first embodiment in the layer configuration, but the other configurations are the same as those in the first embodiment. Therefore, the optical member with the antifouling film in the present embodiment can be the one described in the first embodiment for the configuration other than the layer configuration. In other words, the antifouling film-coated optical member of the present embodiment has a configuration in which the laminated film 14 is removed from the first embodiment.
Further, FIG. 2 also schematically shows the film configuration of the optical member with the antifouling film, and shows the actual thicknesses of the base material 11, the base film 12 and the antifouling film 13 in an accurate ratio. Absent.

<Touch panel display>
FIG. 3 is a schematic diagram showing the configuration of an embodiment of the touch panel display according to the present invention.
In this embodiment, it is a touch panel type display used for a smart phone, and the antifouling film-attached optical member according to the present invention described above is provided as the antifouling film-attached glass used for the display cover glass 31.
The display cover glass 31 is provided on a display unit 32 provided with a transparent electrode, and a main substrate 33 is provided on the opposite side of the display unit 32 from the display cover glass 31.

  Note that the touch panel display according to the present invention is not limited to those used for smartphones, but, for example, other mobile phones, digital cameras, digital video cameras, portable audio players, game devices, car navigation systems, car audio systems, personal computers, tablets It can be used for terminals, liquid crystal displays, organic EL displays, plasma displays, various other display devices, copying machines, bank ATMs, ticket vending machines, and the like.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated in detail, this invention is not limited to these Examples at all.

Example 1
Low refractive index material films 14a and 14c made of SiO ₂ and high refractive index material films 14b and 14d made of an alumina-containing titanium oxide-lanthanum oxide mixed material on a glass having a thickness of 0.8 mm as the base material 11. Were alternately formed to form a laminated film 14 having a four-layer structure. Each layer constituting the laminated film 14 is formed by vapor deposition, and the film thickness is 15 nm for the low refractive index material film 14a, 16.5 nm for the high refractive index material film 14b, 35 nm for the low refractive index material film 14c, and a high refractive index material film. 14d was 136.5 nm. The low refractive index material film 14a is provided in contact with the base material 11 made of glass.

Next, the base film 12 made of SiO ₂ was formed on the laminated film 14 (high refractive index material film 14d located at the uppermost part) by vapor deposition. In order to obtain the desired surface roughness Ra, the film formation rate of the base film 12 is 1 Å / S (the film formation rate of the low refractive index film of the laminated film 14 is 7 Å / S), and the temperature during film formation is about 150. C. It should be noted that only the base film 12 that needs to have the desired surface roughness Ra was slowed down and the film deposition speed of each film of the laminated film 14 was increased. This can increase productivity. In addition, the film thickness of the base film 12 was 91 nm.

And the antifouling film | membrane 13 which consists of a fluorine-type compound was formed on the base film 12 by vapor deposition, and the optical member with an antifouling film was produced. As the fluorine compound, SURFCLEAR100 (manufactured by Canon Optron Co., Ltd.) containing perfluoroalkyl ether-containing trimethoxysilane was used to form an antifouling film 13 having a film thickness of 12 to 14 nm. Moreover, the structure of the obtained optical member with an antifouling film is the same as that of the optical member with an antifouling film shown in FIG.

(Example 2, comparative example)
An optical member with an antifouling film was produced in the same manner as in Example 1 except that the deposition rate of the base film 12 was changed.

(Examples 3 to 5)
An optical member with an antifouling film was produced in the same manner as in Example 1 except that the laminated film 14 was not formed and the film formation rate of the base film 12 was changed. Moreover, the structure of the obtained optical member with an antifouling film is the same as that of the optical member with an antifouling film shown in FIG.

(Abrasion resistance test)
For the optical members with antifouling films of Examples 1 to 5 and Comparative Example produced as described above, an abrasion resistance test was performed according to the following method.
Steel wool # 0000 (diameter: about 0.012 mm, manufactured by Nippon Steel Wool Co., Ltd.) is placed on the surface of the antifouling film 13 of the optical member with the antifouling film and moved back and forth with a load of 1 kg / cm ² applied. A wear resistance test was conducted. The reciprocating movement was performed under conditions of a moving speed of 60 reciprocating / min and a moving distance of 15 mm.

In addition, the abrasion resistance was evaluated by measuring the contact angle with water after friction with steel wool. Specifically, every time the steel wool was rubbed 1000 times, a droplet was made on the surface of the antifouling film 13 after the friction, and the contact angle with water was measured.
The water contact angle is an angle formed by a tangent to the water surface and a solid surface at a point where the solid and water contact. Here, the larger the value of the water contact angle, the smaller the surface of the antifouling film 13 is.
The water contact angle is measured when the water contact angle is measured at nine locations (measurement locations No. 1 to 9) on the surface of the antifouling film 13, and the water contact angle is 100 ° or more at all nine points. The case where even one point out of the nine points has a contact angle with water of less than 100 ° was regarded as unacceptable. In the measurement of the contact angle with water when the number of frictions was 0, only 5 points were measured because no scratches were caused by friction at any location.

  The results of the abrasion resistance test of the optical members with antifouling films of Examples 1 to 5 and Comparative Example are shown in Table 1 below. Moreover, when producing the optical member with an antifouling film of Examples 1 to 5 and the comparative example, the surface roughness Ra of the base film 12 before forming the antifouling film 13 was measured by the measurement method described above, and this It shows together with following Table 1.

In Example 1, the value of the surface roughness Ra of the base film 12 is 0.31. As is apparent from Table 1 above, the number of wears at the first failure is 14,000, and at least when the number of wears is 13000, the conditions for passing are satisfied. Therefore, it can be seen that the maximum number of wear conditions that satisfy the pass condition regarding wear resistance is any value between 13,000 times and less than 14000 times.
In Example 2, the value of the surface roughness Ra of the base film 12 is 0.75. The maximum number of wear conditions that satisfy the pass condition regarding wear resistance in Example 2 is any value between 8000 times and less than 9000 times.
On the other hand, in the comparative example, the value of the surface roughness Ra of the base film 12 is 1.25 (the value in the range shown in Patent Document 2). It can be seen that the maximum number of wears that satisfy the pass condition regarding the wear resistance in the comparative example is less than 1000 times, the wear resistance is poor, and excellent antifouling properties cannot be obtained over a long period of time.

In Example 3, the value of the surface roughness Ra of the base film 12 is 0.36. The maximum number of wear conditions that satisfy the pass condition regarding wear resistance in Example 3 is any value between 9000 times and less than 10,000 times.
In Example 4, the value of the surface roughness Ra of the base film 12 is 0.25. The maximum number of wear conditions that satisfy the pass condition regarding wear resistance in Example 4 is any value between 9000 times and less than 10,000 times.
In Example 5, the value of the surface roughness Ra of the base film 12 is 0.76. The maximum number of wear conditions that satisfy the pass condition regarding wear resistance in Example 5 is any value between 6000 times and less than 7000 times.

(Example 6)
A tempered glass (Gorilla glass manufactured by Corning) cut to 4 inches having a thickness of 0.7 mm was used as a base material, and the edge of the tempered glass was coated to produce a display cover glass 31. Furthermore, the display cover glass 31 was bonded to the display unit 32 including a transparent electrode.

After the display cover glass 31 was washed, it was set in a vacuum vapor deposition machine so that vapor deposition was possible on the surface of the display unit 32 opposite to the side to which it was attached.
Next, after vacuuming to a pressure of 1.0 × 10 ⁻³ [Pa], seven layers of Nb ₂ O ₅ (niobium pentoxide) and SiO ₂ (silicon dioxide) were alternately formed. Further, an SiO ₂ layer (underlayer) was deposited on the seventh Nb ₂ O ₅ layer at a deposition rate of 1 [Å / sec], which was slower than the sixth layer. . The laminated film (a total of 8 layers including the base film) laminated on the display cover glass 31 had a film thickness of 306 nm.
Then, this SiO ₂ film using a SURFCLEAR100 containing a perfluoroalkyl ether containing trimethoxysilane formed by vapor deposition at a thickness of 12 to 16 nm, to form antifouling.

The coated display cover glass 31 provided with the display unit 32 was combined with the main substrate 33 to produce a touch panel display.
This touch panel display had excellent antifouling performance and was able to maintain high durability.

According to the structure of Examples 1-6 demonstrated above, the unevenness | corrugation of the base film 12 can be smooth | blunted, the abrasion resistance of the antifouling film | membrane 13 can be improved greatly, and the antifouling property excellent in the long term is demonstrated. I knew it was possible.

The above-described embodiments are merely examples of implementation in carrying out the present invention, and the technical scope of the present invention should not be interpreted in a limited manner. That is, the present invention can be implemented in various forms without departing from the gist or the main features thereof.

This application claims priority from Japanese Patent Application No. 2014-032960 filed on February 24, 2014, the contents of which are incorporated herein by reference.

DESCRIPTION OF SYMBOLS 11 Base material 12 Base film 13 Antifouling film 14 Laminated film 31 Cover glass 32 for display Display part 33 Main board

Claims (12)

An antifouling film-coated optical member having a base material, a base film formed on the base material, and an antifouling film formed by vapor deposition on the surface of the base film,
The underlayer is less surface roughness Ra of 0.36 nm of the underlying film antifouling film with optical member component and the component of the antifouling film is characterized that you have to siloxane bonds. A scratch test was performed in which a steel wool of # 0000 was placed on the surface of the antifouling film and the steel wool was reciprocated at a movement distance of 15 mm and a movement speed of 60 reciprocations / min in a state where a load of 1 kg / cm ² was applied. The optical member with an antifouling film according to claim 1, wherein the contact angle of water on the surface of the antifouling film after reciprocation is 100 ° or more. The optical member with an antifouling film according to claim 1 or 2 , wherein the base film is made of SiO ₂ . The optical member with an antifouling film according to any one of claims 1 to 3 , wherein the antifouling film is made of a perfluoroalkyl ether compound represented by the following formula.
formula

(In the formula, Rf is a perfluoroalkyl ether group, X is an organic group containing a hydrolyzable group-containing silane having a plurality of hydrolyzable groups, and Y is an organic group linking the Rf group and the X group.) The surface roughness Ra of the said base film is 0.25 nm or more and 0.36 nm or less, The optical member with an antifouling film as described in any one of Claims 1 thru | or 4 characterized by the above-mentioned. The optical member with an antifouling film according to any one of claims 1 to 5 , wherein the base film is a film formed by vapor deposition. Further comprising a laminated film formed on the substrate,
The laminated film is formed by alternately laminating two or more layers of a film made of a low refractive material and a film made of a high refractive material,
The film made of the low refractive material is a film formed by vapor deposition,
The underlayer is made is formed on the laminated film, and an antifouling film with optical member according to claim 6, wherein the ing from the same material as the film made of the low refractive material.   The optical member with an antifouling film according to any one of claims 1 to 7, wherein the antifouling film has a thickness of 10 to 20 nm. A touch panel display comprising the optical member with an antifouling film according to any one of claims 1 to 8 . On a substrate, it possesses the steps of the surface roughness Ra to form the following base film 0.36 nm, and forming an antifouling layer by vacuum evaporation on the surface of the underlying film, the components of the underlayer A method for producing an optical member with an antifouling film, wherein a component of the antifouling film is bonded to a siloxane bond .   A step of forming a laminated film in which a film made of a low refractive material and a film made of a high refractive material are alternately laminated on a substrate; and a surface roughness Ra is 0 on the laminated film by vapor deposition. A step of forming a base film of 36 nm or less, and a step of forming an antifouling film by vapor deposition on the surface of the base film,
  The film made of the low refractive material is formed by vapor deposition, the base film is made of the same material as the film made of the low refractive material, and the component of the base film and the component of the antifouling film are bonded by siloxane, A method for producing an optical member with an antifouling film, characterized in that a film formation speed at which a base film is formed is slower than a film formation speed at which a film made of the low refractive material is formed. A method for manufacturing a touch panel display, comprising providing the optical member with an antifouling film produced by the manufacturing method according to claim 10 or 11 on a display unit of the touch panel display.

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