Automobile interior mirror, and manufacturing method for the same

Abstract

To provide an automobile interior mirror high in durability that is capable of maintaining a beautiful appearance and light reflection performance for a long term.SOLUTION: An automobile interior mirror 10 includes: a glass plate 10A having a pair of principal surfaces; an antifouling layer 10B which is layered on a first surface 11 to be one of the principal surfaces of the glass plate 10A and includes a silicon-containing compound; and a light reflecting layer 10C which is layered on a second surface 12 to be the other principal surface of the glass plate 10A and includes a metal element. The first surface 11 includes the metal element so as to maintain the antifouling performance after an abrasion resistance test of the antifouling layer 10B.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an automobile interior mirror for use in the interior of a vehicle, and a method for manufacturing the same. [Background technology]

[0002] Conventionally, there are known interior mirrors for automobiles used in the interiors of vehicles such as automobiles and trains (see, for example, Patent Documents 1 and 2). An interior mirror device for automobiles equipped with such an interior mirror is also called a vanity mirror, and is attached to the sun visor or table of the vehicle.

[0003] The automobile interior mirror described in Patent Document 1 is supported by a frame member (referred to as a "fixed sun visor" in the document) of the sun visor of the automobile, and is configured to be rotatable via an axis member (referred to as a "support rod" in the document). This automobile interior mirror is provided with a movable sun visor that can slide relative to the fixed sun visor, and a lid that can be opened and closed is provided on the movable sun visor, and the mirror surface is exposed from an opening formed by opening the lid.

[0004] The interior mirror for automobiles described in Patent Document 2 is supported by a frame member on the rear side of the backrest of a train seat on the rear seat side, and a mirror cover held by Velcro (registered trademark) on the surface of the frame member can be opened and closed. This interior mirror for automobiles is designed so that the angle of the mirror surface can be changed by removing the mirror cover and then rotating the upper hinge of the frame member. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2004-175293 A [Patent Document 2] JP 2003-312348 A Summary of the Invention [Problem to be solved by the invention]

[0006] Although automobile interior mirrors are protected by lids or mirror covers to prevent foreign matter such as dust and fingerprints from adhering to them, the more frequently they are used, the more likely they are to become contaminated by foreign matter, which reduces the mirror's light reflecting performance, and therefore they need to be cleaned frequently by wiping, etc. Conventional automobile interior mirrors have exposed glass, and frequent wiping, etc. can easily scratch the surface, impairing the appearance and reducing the light reflecting performance.

[0007] Therefore, there is a demand for a highly durable automobile interior mirror that can maintain its aesthetic appearance and light reflecting performance for a long period of time. [Means for solving the problem]

[0008] The characteristic configuration of the automobile interior mirror of the present invention is that it comprises a glass plate having a pair of main surfaces, an anti-fouling layer containing a silicon-containing compound laminated on a first surface, which is one of the main surfaces of the glass plate, and a light-reflecting layer containing a metal element laminated on a second surface, which is the other main surface of the glass plate, wherein the first surface contains the metal element so as to maintain the anti-fouling properties of the anti-fouling layer after an abrasion resistance test.

[0009] Automotive interior mirrors that can be switched between in-use and out-of-use states tend to accumulate dust, fingerprints, and other foreign matter less frequently than exterior mirrors that are in constant use, and are usually cleaned less frequently, so mirror covers have been provided to prevent foreign matter from accumulating. However, in recent years, with lifestyle changes such as the spread of teleworking, people have started to use mirrors more frequently inside the car to groom themselves, and there is concern that frequent cleaning of the mirror surface may cause scratches on the mirror surface, impairing its aesthetic appearance and light reflection performance.

[0010] Therefore, as in the present configuration, by providing an antifouling layer covering at least a part of the first surface of the glass plate, which is the mirror surface side, the decrease in light reflection performance can be suppressed. On the other hand, the present inventors have found that when a light reflection layer is formed by forming a film of a metal element on the second surface of a glass plate by a gas phase film formation method, such as vacuum deposition, a metal component also adheres to the first surface opposite to the second surface on which the light reflection layer is formed, accompanying film formation by the gas phase film formation method. Such deposits derived from metal components have poor adhesion to the surface of the glass plate because the collision speed of the metal element colliding with the first surface is slower than the collision speed of the metal element colliding with the second surface, and are easily peeled off from the first surface due to friction or the like. Moreover, it was thought that the metal element may cause a decrease in the adhesion of the antifouling layer. Therefore, when an antifouling layer is formed on the first surface having such deposits, the antifouling layer peels off due to frequent wiping or the like. However, according to the present configuration, since the first surface contains a metal element so as to maintain the antifouling property after the abrasion resistance test of the antifouling layer, the antifouling layer is unlikely to peel off even if the first surface contains a metal element.

[0011] Another characteristic configuration is that the first surface has a first region and a second region containing the metal element, and the abundance ratio of the metal element contained in the first region to the metal element contained in the second region is greater than 1.

[0012] The first surface of the glass plate has a first region and a second region containing metal elements as attachments. Here, the first region refers to the periphery where a jig was installed on the first surface to hold the glass plate when forming the light-reflecting layer, and the second region refers to the portion other than the first region. When forming a light-reflecting layer by a gas-phase film-forming method typified by vacuum deposition, a jig or the like may be installed on the first surface to hold the glass plate. When a metal component is reflected by the jig, the metal component is likely to adhere to the periphery where the jig is installed. Therefore, the attachments derived from the metal components contained in the first region are more than the attachments derived from the metal components contained in the second region, so that the anti-fouling layer formed on the first region is more likely to peel off than the anti-fouling layer formed on the second region. On the other hand, since the anti-fouling layer is also formed on the attachments, the surface area of ​​the anti-fouling layer formed increases when there are more attachments, and the protection of the attachments by the anti-fouling layer is enhanced, so that the attachments are less likely to peel off from the surface of the glass plate. Since deposits derived from metal components can be detected as metal elements, peeling of the antifouling layer can be suppressed by making the abundance ratio of the metal element contained in the first region to the metal component contained in the second region greater than 1. Hereinafter, a vapor deposition method will be exemplified as a film formation method, but any gas phase film formation method may be used and the method is not limited to this.

[0013] Another characteristic feature is that the abundance ratio of the metal element contained in the first region to the metal element contained in the second region is 2 or less.

[0014] During vacuum deposition to form the light-reflecting layer, metal components may also adhere to the jig holding the glass plate, and the jig and the metal components may react to produce metal compounds. These metal compounds tend to fall around the jig when the pressure is restored after vacuum deposition or when the jig is removed, and become deposits on the first surface. Such deposits derived from metal compounds have poorer adhesion to the surface of the glass plate than deposits derived from metal components, and are therefore more easily peeled off from the surface of the glass plate by friction or the like. Since many such deposits exist around the jig on the first surface of the glass plate, the first region contains many deposits derived from metal compounds. Therefore, the antifouling layer formed on the first region is more likely to peel off with the peeling of the deposits derived from metal compounds compared to the antifouling layer formed on the second region. Since the deposits derived from metal compounds can be detected as metal elements, by setting the abundance ratio of the metal elements contained in the first region to the metal elements contained in the second region to 2 or less, the deposits derived from metal compounds present in the second region can be reduced, and the peeling of the antifouling layer caused by the peeling of the deposits can be suppressed.

[0015] Another characteristic feature is that the metal element includes Al.

[0016] Al, one of the components of the light-reflecting layer, has a high tendency to ionize, and is therefore prone to forming deposits derived from metal compounds. Therefore, by detecting the Al contained in such deposits and setting the abundance ratio of Al contained in the first region to Al contained in the second region to 2 or less, it is possible to reduce the deposits derived from metal compounds present in the second region and suppress peeling of the antifouling layer due to peeling of the deposits. In addition, since Al is a light metal and can be easily analyzed, it can be detected using a general-purpose detection device.

[0017] Furthermore, a feature of the manufacturing method for an automobile interior mirror according to the present invention is that it is a manufacturing method for an automobile interior mirror having a glass plate having a pair of main surfaces, and includes a holding step of holding a first surface, which is one of the main surfaces of the glass plate, using a jig, a light-reflecting layer forming step of forming a light-reflecting layer containing a metal element by vapor deposition on a second surface, which is the other main surface of the glass plate, an anti-fouling layer forming step of forming an anti-fouling layer on the first surface, and an anti-fouling layer peeling prevention step of preventing peeling of the anti-fouling layer.

[0018] According to the manufacturing method of the present invention, which includes a holding step of holding the first surface, which is one of the main surfaces of the glass plate, with a jig, a light reflecting layer forming step of forming a light reflecting layer containing a metal element by vapor deposition on the second surface, which is the other main surface of the glass plate, an anti-soiling layer forming step of forming an anti-soiling layer on the first surface, and an anti-soiling layer peeling prevention step of preventing peeling of the anti-soiling layer, it is possible to manufacture an automobile interior mirror in which the anti-soiling layer is not easily peeled off. As a result, it is possible to provide an automobile interior mirror with high durability that can maintain the beauty of the automobile interior mirror for a long period of time.

[0019] Another feature is that the antifouling layer peeling prevention step is a step of polishing and cleaning the first surface after the light reflecting layer forming step is carried out.

[0020] When the first surface of the glass plate is polished and cleaned after the light reflecting layer forming step is performed, among the metal components that adhere to the first surface of the glass plate in the light reflecting layer forming step, the deposits derived from metal compounds with poor adhesiveness are removed by the polishing and cleaning, and the deposits derived from metal components with strong adhesiveness remain to a certain extent. When an anti-fouling layer is formed on such deposits derived from metal components, the surface area of ​​the anti-fouling layer increases, and the anti-fouling layer protects the deposits derived from metal components, making the deposits derived from metal components less likely to peel off. This makes it possible to prevent the anti-fouling layer from peeling off due to the peeling off of the deposits derived from metal components and metal compounds.

[0021] Another feature is that the first surface has a first region and a second region containing the metal element, and the anti-fouling layer peeling prevention process is carried out when the abundance ratio of the metal element contained in the first region to the metal element contained in the second region is greater than 2.

[0022] The first region refers to the periphery of a jig that is installed on the first surface to fix the glass sheet, and the second region refers to a portion other than the first region. When the abundance ratio of the metal element contained in the first region to the metal element contained in the second region is greater than 2, the manufacturing process and manufacturing time can be shortened by polishing and cleaning the first surface. [Brief description of the drawings]

[0023] [Figure 1] FIG. 2 is a front view of an automobile interior mirror. [Diagram 2] FIG. 2 is a cross-sectional view taken along the line II-II of FIG. [Diagram 3] 1A to 1C are diagrams showing the manufacturing process of an automobile interior mirror. [Figure 4] 1A to 1C are diagrams showing the manufacturing process of an automobile interior mirror. [Diagram 5] 3 is a photograph of the surface of a first region 111 according to an example. [Figure 6] 4 is a surface photograph of a first region 111 according to a comparative example. [Figure 7] 4 is a graph showing a ratio of a chemical component contained in a second region to a chemical component contained in a first region on a first surface of a glass sheet. [Figure 8] 1 is an example showing a seat equipped with an interior mirror for a vehicle. [Figure 9] 1 is an example showing a seat equipped with an interior mirror for a vehicle. [Figure 10] 1 is an example showing a seat equipped with an interior mirror for a vehicle. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Hereinafter, an embodiment of the automobile interior mirror according to the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiment, and various modifications are possible without departing from the spirit of the present invention.

[0025] 1 and 2, an automobile interior mirror 10 includes a glass plate 10A having a first surface 11 on the mirror surface 10a side and a second surface 12 on the opposite side to the first surface 11, and an antifouling layer 10B covering at least a part of the first surface 11. In this embodiment, the antifouling layer 10B covers the entire first surface 11 of the glass plate 10A. A light reflecting layer 10C is formed on the second surface 12 of the glass plate 10A.

[0026] As the glass plate 10A, a known glass for mirrors can be used, for example, soda lime glass. As shown in FIG. 1, the glass plate 10A of the present embodiment is formed in a rectangular shape. The thickness of the glass plate 10A is preferably 1.5 mm or more and 5 mm or less, and more preferably 2 mm or more and 3 mm or less. If the thickness of the glass plate 10A is less than 1.5 mm, the strength as a mirror decreases, and if it is more than 5 mm, the refraction of light by the glass plate 10A increases, not only decreasing the light reflecting performance of the light reflecting layer 10C, but also deteriorating fuel efficiency, which goes against the weight reduction of the vehicle.

[0027] The light reflecting layer 10C is a metal film made of silver, copper, zinc, aluminum, or an alloy thereof. Examples of methods for forming the light reflecting layer 10C include electroless plating, vacuum deposition, and sputtering. Vapor phase film formation methods such as vacuum deposition and sputtering are more useful and preferable than other formation methods in that they can form a metal film up to the edge of the glass plate 10A. In addition, the vacuum deposition method is particularly preferable in that the light reflecting layer 10C can be formed even on a large glass plate, making it possible to mass-produce the automobile interior mirror 10 and to efficiently and inexpensively produce the automobile interior mirror 10. In this embodiment, the light reflecting layer 10C is formed using the vacuum deposition method.

[0028] The light reflecting layer 10C may include a protective layer on the outer side (the side away from the second surface 12). The protective layer is formed, for example, by applying a urethane resin or by sputtering transfer. This urethane resin has high waterproof performance and is more resistant to chemicals than the alkyd resin that is the conventional protective layer. Therefore, the automobile interior mirror 10 can maintain its durability even if it is repeatedly washed and chemicals get into it. The protective layer may be formed using phthalic acid resin, acrylic resin, silicone resin, fluorine resin, epoxy resin, etc.

[0029] When forming the light reflecting layer 10C by vacuum deposition, the glass plate 10A is placed in a vacuum deposition apparatus, and a jig or the like for holding the glass plate 10A is placed on the first surface 11. The jig or the like cannot cover the entire first surface 11 due to weight considerations, and so covers only a part of the first surface 11.

[0030] When vacuum deposition is performed on the glass plate 10A, most of the metal components collide with the second surface 12 and adhere to the second surface 12 to form the light reflecting layer 10C. On the other hand, some of the metal components do not collide with the second surface 12, but go around the glass plate 10A and collide with the first surface 11, becoming the metal component-derived deposit 51. Since the collision speed of the metal components colliding with the first surface 11 is slower than the collision speed of the metal components colliding with the second surface 12, the adhesion of the metal component-derived deposit 51 on the first surface 11 is inferior to the adhesion of the light reflecting layer 10C on the second surface 12, and the metal component-derived deposit 51 is likely to peel off from the first surface 11. However, as described below, the antifouling layer 10B is also formed on the surface of the metal component-derived deposit 51, so that the surface area of ​​the antifouling layer 10B can be increased by forming the metal component-derived deposit 51 to a certain extent. As a result, the antifouling layer 10B protects the metal component-derived deposit 51, and the peeling of the metal component-derived deposit 51 is suppressed. On the other hand, when a large amount of deposits 51 derived from metal components are formed on the first surface 11, the deposits 51 derived from metal components peel off more frequently, and the antifouling layer 10B becomes more likely to peel off from the first surface 11. Therefore, it is desirable that the deposits 51 derived from metal components are formed to such an extent that they can be protected by the antifouling layer 10B. Note that such deposits 51 derived from metal components are also formed when a part of the metal components is reflected inside the vacuum deposition device or reflected by a jig. In particular, when reflected by the jig, deposits 51 derived from metal components are likely to be formed around the jig.

[0031] It was also presumed that some of the metal components adhere to the jig and react with it to generate a metal compound. Because the adhesion between the metal compound and the jig is weak, the metal compound falls from the jig onto the first surface 11 when the pressure is restored after vacuum deposition or when the jig is removed, and adheres to the first surface 11 as deposit 52 derived from the metal compound (see FIG. 3). Since deposit 52 derived from the metal compound is generated in this manner, it has even poorer adhesion to first surface 11 than deposit 51 derived from the metal component, and is more likely to peel off from first surface 11. Hereinafter, deposit 51 derived from the metal component and deposit 52 derived from the metal compound are collectively referred to as deposit 5.

[0032] The deposits 5 tend to adhere to a first region 111 on the first surface 11, which is the periphery of the jig where the jig was placed. Therefore, if the portion of the first surface 11 other than the first region 111 is defined as a second region 112, the first region 111 contains more deposits 5 than the second region 112 (see FIG. 3). Therefore, of the anti-fouling layers 10B formed on these surfaces, the anti-fouling layer 10B formed in the first region 111 (hereinafter referred to as the first region 101B of the anti-fouling layer 10B) is more likely to peel off than the anti-fouling layer 10B formed in the second region 112 (hereinafter referred to as the second region 102B of the anti-fouling layer 10B).

[0033] The antifouling layer 10B contains a silicon-containing fluorine-based compound. Examples of the silicon-containing fluorine-based compound include fluorine-substituted alkyl group-containing organosilicon compounds, alkoxysilane-terminated modified perfluoropolyethers, fluorine-containing silane compounds, perfluoropolyether alkoxysilanes, fluorine-based alkoxysilanes, and fluoroalkyl oligomer-substituted trimethoxysilanes, and fluorine-based alkoxysilanes are preferred. More specifically, the antifouling layer 10B is an antifouling film made of a compound containing an -OC3F6- group and an SiOMe3 group in its molecule. The antifouling layer 10B contains a silicon-containing fluorine-based compound, and therefore has excellent antifouling properties, water repellency, and chemical resistance.

[0034] The antifouling layer 10B preferably contains a metal material in addition to the silicon-containing fluorine-based compound. Examples of the metal material include copper, silver, zinc, or an alloy of these, and copper is preferable. If the antifouling layer 10B contains a metal material, it will also have excellent antibacterial properties. For example, a method of adding a nitrate to a solution containing the above-mentioned silicon-containing fluorine-based compound can be used to make the antifouling layer 10B contain a metal material. These metal ions are incorporated into the antifouling layer 10B, and the layer can have antibacterial and antiviral properties in addition to antifouling properties.

[0035] The anti-staining layer 10B preferably includes an underlayer on the first surface 11 side of the glass plate 10A. The underlayer may be an oxide layer, and is preferably a SiO2 layer. If the anti-staining layer 10B includes an underlayer, the anti-staining layer 10B can be firmly attached to the glass plate 10A, and the peel strength can be increased. For this underlayer, a vapor-deposited film of SiO2, a film formed using a hydrolyzable silane compound, or the like is used.

[0036] The stain-resistant layer 10B may contain silica (SiO2 or a silicon compound composed of SiO2). If the stain-resistant layer 10B contains silica in this way, the adhesion to the glass plate 10A can be improved, and the abrasion resistance against frequent wiping can be improved.

[0037] Examples of methods for forming the antifouling layer 10B include spin coating, squeegee coating, wet coating, vacuum deposition, and sputtering. From the viewpoint of ease of production, squeegee coating is preferred, but from the viewpoint of wear resistance and antifouling resistance, spin coating is most preferred. After the formation of the antifouling layer 10B, a post-treatment may be selectively performed in which the glass plate 10A on which the antifouling layer 10B is formed is kept at a high temperature (50°C to 150°C) (10 minutes to 100 minutes). For example, this post-treatment may be performed by keeping the glass plate 10A on which the antifouling layer 10B is formed at 100°C for 30 minutes. By performing this post-treatment, the wear resistance of the antifouling layer 10B can be further improved.

[0038] The thickness of the antifouling layer 10B is preferably thicker than 100 nm. If the thickness of the antifouling layer 10B is 1 nm or more, it has abrasion resistance and functions as the antifouling layer 10B. However, if the thickness is 100 nm or less, the thickness of the antifouling layer 10B relative to the attachment 5 is thin, so that the attachment 5 is easily peeled off from the first surface 11 due to friction or the like. Moreover, it was thought that the attachment 5 would cause a decrease in the adhesion of the antifouling layer 10B. On the other hand, if the antifouling layer 10B is formed on the first surface 11 having the attachment 5, the antifouling layer 10B is also formed on the attachment 5. Therefore, if the antifouling layer 10B having a thickness of more than 100 nm is formed on both the first surface 11 and the attachment 5, the attachment 5 is protected by the antifouling layer 10B, so that the attachment 5 is less likely to peel off from the first surface 11, and peeling of the antifouling layer 10B is also suppressed.

[0039] Moreover, if the thickness of the antifouling layer 10B is more than 200 nm, the scattering of light in the antifouling layer 10B increases, causing the automobile interior mirror 10 to look white, so the thickness is preferably 200 nm or less. Here, the first region 111 has more deposits 5 consisting of deposits 51 derived from metal components and deposits 52 derived from metal compounds than the second region 112. Even if the thickness of the antifouling layer 10B is 200 nm or less, the thickness of the antifouling layer 10B is thin relative to the deposits 5, so that the antifouling layer 10B formed on the first region 111 where a large amount of deposits 5 exists (the first region 101B in the antifouling layer 10B) is easily peeled off with the peeling of the deposits 5. Here, the deposits 51 derived from metal components have better adhesion to the first surface 11 than the deposits 52 derived from metal compounds. Moreover, since the antifouling layer 10B is formed on the surface of the deposits 5, the more the deposits 5, the larger the surface area of ​​the antifouling layer 10B formed. Therefore, when a large amount of the deposits 51 derived from metal components is present, the antifouling layer 10B formed on the deposits 51 derived from metal components protects the entire deposits 5, and thus peeling of the deposits 52 derived from metal compounds is suppressed. Specifically, it is preferable that the abundance ratio of the deposits 51 derived from metal components contained in the first region 111 to the deposits 51 derived from metal components contained in the second region 112 is greater than 1. The abundance of the deposits 51 derived from metal components can be examined by detecting the metal elements contained in the deposits 51 derived from metal components using, for example, secondary ion mass spectrometry (SIMS) or X-ray fluorescence spectrometry (XRF). Note that secondary ion mass spectrometry may be performed on the antifouling layer 10B formed on the first surface 11, and the abundance ratio of the metal elements in the first region 101B to the metal elements in the second region 102B may be calculated.

[0040] If there is too much of the metal component-derived deposit 51 in the first region 111, the frequency of the metal component-derived deposit 51 peeling off increases, so that the antifouling layer 10B is less able to protect the deposit 5, and the antifouling layer 10B is more likely to peel off. Therefore, when the thickness of the antifouling layer 10B is 200 nm or less, it is preferable to set the abundance ratio of the metal component-derived deposit 51 in the first region 111 to the metal component-derived deposit 51 in the second region 112 to 2 or less. The abundance of the metal component-derived deposit 51 can be examined by detecting the metal element contained in the metal component-derived deposit 51 using, for example, secondary ion mass spectrometry (SIMS) or X-ray fluorescence spectrometry (XRF). Therefore, it is sufficient that the abundance ratio of the metal element contained in the first region 111 to the metal element contained in the second region 112 is 2 or less. This reduces the metal component-derived deposit 51 in the first region 111, and suppresses peeling of the antifouling layer 10B due to peeling of the deposit 5. The abundance ratio of the metal element contained in the first region 111 to the metal element contained in the second region 112 may be calculated by performing secondary ion mass spectrometry on the anti-fouling layer 10B formed on the first surface 11, and calculating the abundance ratio of the metal element contained in the first region 101B in the anti-fouling layer 10B to the metal element contained in the second region 102B in the anti-fouling layer 10B. Alternatively, the abundance ratio of the metal element contained in the first region 111 to the metal element contained in the second region 112 may be calculated by measuring the deposits 52 derived from metal compounds contained in the first region 111 and the second region 112.

[0041] (Wear resistance test) The abrasion resistance test of the stain-resistant layer 10B was performed by attaching a dry flannel cloth (No. 300) to a reciprocating abrasion tester ("HEIDEN-18" manufactured by Shinto Scientific Co., Ltd.) and polishing with a pressure of 300 g / cm. 2 The abrasion resistance test of the antifouling layer 10B was performed by (1) measuring the initial diffuse reflectance, and (2) dropping three drops of a test liquid (10 μL) containing oleic acid and heptane in a ratio of 75:25 onto the surface of the antifouling layer 10B, attaching a dry flannel cloth (No. 300) to a reciprocating abrasion tester ("HEIDEN-18" manufactured by Shinto Scientific Co., Ltd.) and applying a force of 1 kg / 4 cm 2(3) Next, the flannel cloth (No. 300) is replaced with a new one and the cloth is reciprocated another 50 times, and (4) the diffuse reflectance after the test is measured. The diffuse reflectance is measured in the range of 290 to 810 nm using an ultraviolet-visible-near infrared spectrophotometer (Shimadzu Corporation's "UV-3100PC") and a multipurpose large test chamber (Shimadzu Corporation's "MPC-3100"), and the difference in diffuse reflectance before and after the test Δ (the absolute value of the above (1)-(4)) should be 2.0 or less, preferably 1.0 or less, and more preferably 0.5 or less.

[0042] [Method of manufacturing automobile interior mirrors] The manufacturing method of the automobile interior mirror 10 in this embodiment will be described with reference to Fig. 3. First, in order to perform vacuum deposition, the glass plate 10A is placed in a vacuum deposition device, and a holding step is performed in which a jig is used to hold the first surface 11 of the glass plate 10A. In the continuous manufacturing process of the automobile interior mirror 10, metal compounds generated in the light reflecting layer forming step of the previous batch are attached to the jig.

[0043] Next, a light reflecting layer forming step is performed to form the light reflecting layer 10C by vacuum deposition. During the vacuum deposition, the metal components collide with not only the second surface 12 but also the first surface 11 of the glass plate 10A, so that deposits 51 derived from the metal components are attached to the first surface 11. The metal components also collide with the jig and react with the jig to generate metal compounds.

[0044] After light reflecting layer 10C is formed, the pressure inside the vacuum deposition apparatus is restored and the jig is removed from first surface 11, and the metal compounds on the surface of the jig fall onto first surface 11 and adhere to first surface 11 as deposits 52 derived from metal compounds. In other words, after light reflecting layer 10C is formed and the jig is removed, deposits 5 consisting of deposits 51 derived from metal components and deposits 52 derived from metal compounds adhere to first surface 11. On first surface 11, a large amount of deposits 5 is present in first region 111, which is the area around where the jig was placed.

[0045] Next, the glass plate 10A is taken out of the vacuum deposition apparatus and the antifouling layer forming step is performed. The antifouling layer 10B is formed by using a spin coating method. At this time, as the antifouling layer peeling prevention step, if the thickness of the antifouling layer 10B is made thicker than 100 nm, the adhesion 5 can be covered with the antifouling layer 10B, and the peeling of the adhesion 5 can be suppressed.

[0046] Next, another method for manufacturing the automobile interior mirror 10 in this embodiment will be described with reference to FIG.

[0047] First, in order to perform vacuum deposition, the glass plate 10A is placed in a vacuum deposition apparatus, and a jig is used to hold the first surface 11 of the glass plate 10A (not shown). Metal compounds generated in the light reflecting layer forming process of the previous batch in the continuous manufacturing process of the automobile interior mirror 10 are attached to the jig. Then, the light reflecting layer forming process is performed to form the light reflecting layer 10C. After the light reflecting layer forming process is completed, the pressure in the vacuum deposition apparatus is restored, and the jig is removed from the first surface 11, and the metal compounds generated on the surface of the jig fall onto the first surface 11 and adhere to the first surface 11. In other words, after the light reflecting layer 10C is formed and the jig is removed, the first surface 11 has deposits 51 derived from metal components and deposits 52 derived from metal compounds attached thereto.

[0048] Next, the glass plate 10A is removed from the vacuum deposition apparatus, and the antifouling layer peeling prevention step is performed. In the antifouling layer peeling prevention step, the first surface 11 of the glass plate 10A is polished and cleaned after the light reflecting layer forming step is performed. As a result, among the deposits 5 attached to the first surface 11 of the glass plate 10A in the light reflecting layer forming step, deposits 52 derived from metal components with poor adhesion are removed, and deposits 51 derived from metal components with strong adhesion remain to a certain extent. Here, "to a certain extent" refers to a case where a trace amount of deposits 51 derived from metal components can be detected by a known measuring device. The polishing and cleaning may be performed using any polishing agent, such as melamine sponge or cerium oxide. By performing the polishing and cleaning, the deposits 52 derived from metal components with poor adhesion attached to the first surface 11 can be removed, so that the antifouling layer 10B is not formed on the deposits 52 derived from metal components with poor adhesion, and peeling of the antifouling layer 10B can be suppressed. Finally, in the antifouling layer forming step, the antifouling layer 10B is formed by spin coating on the polished and cleaned first surface 11 to obtain the automobile interior mirror 10. The thickness of the antifouling layer 10B in this manufacturing step is preferably 1 nm or more and 200 nm or less.

[0049] After the light reflecting layer forming step, the amount of the deposits 5 contained in the first surface 11 may be measured to determine whether or not to perform the antifouling layer peeling prevention step. The amount of deposits 5 can be detected by secondary ion mass spectrometry or the like. In particular, it is preferable to perform the antifouling layer forming step when the abundance ratio of the metal element contained in the first region 111 to the metal element contained in the second region 112 is 2 or more. When the antifouling layer peeling prevention step is not performed, the manufacturing process of the automobile interior mirror 10 can be shortened, and therefore the manufacturing time can be shortened. In addition, the quantitative analysis of the metal elements is not limited to the measurement on the first surface 11, and may be performed on the antifouling layer 10B formed on the first surface 11.

[0050] The jig may be cleaned by any appropriate method. Cleaning the jig can remove the deposits 51 derived from metal components and the deposits 52 derived from metal compounds attached to the jig from the jig, and therefore can prevent the deposits 5 from adhering to the first surface 11 of the glass plate 10A when the jig is removed, etc.

[0051] [Example of automobile interior mirror creation] An example of how to make an interior mirror 10 for an automobile will be described below.

[0052] First, the examples were produced. First, the jig was cleaned by any method. Next, the glass plate 10A was placed in a vacuum deposition apparatus, and the first surface 11 of the glass plate 10A was held using the cleaned jig. Next, the apparatus was evacuated, and the light reflecting layer 10C was formed by deposition. After the light reflecting layer 10C was formed, the pressure in the apparatus was restored, the jig was removed from the first surface 11, and the glass plate 10A was taken out of the vacuum deposition apparatus. Then, the first surface 11 of the glass plate 10A taken out was polished and cleaned using a melamine sponge. Furthermore, the first surface 11 was measured by secondary ion mass spectrometry (SIMS). Next, an antifouling layer 10B was formed on the first surface 11 by a spin coating method. In this embodiment, an antifouling layer 10B having a thickness of 10 nm was formed.

[0053] Next, a comparative example was produced. The comparative example was produced in the same manner as in the example, except that the first surface 11 of the glass plate 10A after vacuum deposition was not polished and cleaned with a melamine sponge. In addition, the surface of the first surface 11 was measured by secondary ion mass spectrometry (SIMS) in the same manner as in the example. Then, an antifouling layer 10B was formed on the first surface 11 by a spin coating method.

[0054] The above-mentioned abrasion resistance test was carried out for the Examples and Comparative Examples. The difference Δ in diffuse reflectance before and after the test in the Examples was 0.05, while the difference Δ in diffuse reflectance before and after the test in the Comparative Examples was 2.5, suggesting that the antifouling layer 10B had peeled off in the Comparative Examples.

[0055] Next, the water repellency of the examples and comparative examples after the abrasion resistance test was confirmed. After leaving the examples and comparative examples in a space of 5°C or less for 30 minutes, the examples were left in an environment of 23°C and humidity of 70% or more to check the state of condensation. FIG. 5 is a surface photograph of the first region 111 according to the examples. The entire surface of the first region 111 according to the examples is cloudy white, and it is understood that the water repellency of the antifouling layer 10B is maintained. Therefore, it was found that the antifouling layer 10B was not peeled off from the first surface 11 even after the abrasion resistance test, and the antifouling property was maintained. Also, FIG. 6 is a surface photograph of the first region 111 according to the comparative example. On the surface of the first region 111 according to the comparative example, the white-looking part is small, and there are parts with a small contact angle with water, and it is understood that the water repellency of the antifouling layer 10B is lost. That is, it was found that the antifouling layer 10B was peeled off in the comparative example.

[0056] FIG. 7 shows the positive and negative secondary ion intensities of each chemical component detected by secondary ion mass spectrometry, the secondary ion intensity ratio of each chemical component in the first region 111 to the second region 112 in the embodiment, and the secondary ion intensity ratio of each chemical component in the first region 111 to the second region 112 in the comparative example.

[0057] In the examples, the intensity ratio of Al, which is a secondary ion of the deposit 51 derived from a metal component, in the first region 111 to the second region 112 was greater than 1, while the intensity ratio of the secondary ions of the same component in the comparative examples was greater than 2. In the comparative examples, the intensity ratio of AlO2, Al2O4H, and Si2AlO6, which are presumed to be secondary ions of the deposit 52 derived from a metal compound, in the first region 111 to the second region 112 was greater than 2. On the other hand, in the examples, the intensity ratio of the secondary ions of the same components was 2 or less. Therefore, it was found that when the abundance ratio of Al contained in the first region 111 to Al contained in the second region 112 is greater than 1 and the abundance ratio of the deposit 52 derived from a metal compound contained in the first region 111 to the deposit 52 derived from a metal compound contained in the second region 112 is 2 or less, the antifouling layer 10B is difficult to peel off.

[0058] [Installation example of car interior mirror] An installation example of the automobile interior mirror 10 will be described below with reference to Figures 8 to 10. In the following installation example, the automobile interior mirror 10 is used as an automobile interior mirror device 1 with its periphery supported by a frame member 20. The peripheral portions along the four sides of the glass plate 10A are supported so as to be embedded in the frame member 20.

[0059] In the car interior mirror device 1 shown in Figs. 8 to 10, the frame member 20 is a table 34 that can be rotated via an axis member 33 fixed to the rear seat side back 32 of the backrest 31 of a seat 3 (one example of an in-vehicle equipment). By rotating the table 34, it is possible to switch between a stored state in which the table 34 is aligned with the rear seat back 32 and a horizontal state in which the table 34 is pulled rearward from the rear seat back 32 and held horizontally. In this way, if the car interior mirror 10 having the stain-resistant layer 10B is provided on the table 34, it can be used both as a table and a mirror, which is highly convenient. In particular, the car interior mirror device 1 of this embodiment is useful for luxury cars.

[0060] In the example shown in Fig. 8, the frame member 20 is provided with a cover 35 that covers the mirror surface 10a, and the cover 21 is slid or opened to be used. The automobile interior mirror device 1 is normally in a stored state with the table 34 aligned with the back surface 32, and the mirror surface 10a is made visible by opening the cover 21, and the table 34 is rotated via the shaft member 33 to be in a horizontal position, allowing the table 34 to be used. In this way, by providing the cover 35 that covers the mirror surface 10a, it is possible to reduce the frequency of cleaning, and the durability of the automobile interior mirror device 1 can be further improved.

[0061] 9, the frame member 20 is not provided with a cover covering the mirror surface 10a, and the mirror surface 10a is exposed. In the mirror device 1 for automobile interiors, the table 34 is normally stored along the back surface 32, and the mirror surface 10a is not visible. By rotating the table 34 via the shaft member 33, the table 34 becomes horizontal, and the table 34 can be used and the mirror surface 10a becomes visible. In this way, even if the mirror device 1 for automobile interiors does not have a cover covering the mirror surface 10a, the light reflection performance can be maintained for a long period of time by providing the antifouling layer 10B.

[0062] In the mirror device 1 for interior use in a vehicle shown in FIG. 10, the frame member 20 is provided on the back 32 of the backrest 31 of the seat 3 (one example of an in-vehicle equipment) on the rear seat side, and a rotatable table 34 is provided on the back 32, and the table 34 is configured to be switchable between a use state in which the mirror surface 10a appears and is visible and a non-use state in which the mirror surface 10a is hidden and cannot be seen by rotating the table 34. In this embodiment, the frame member 20 supporting the mirror surface 10a is supported on the back 32, and the table 34 is switchable between a storage state in which the table 34 is aligned with the back 32 and a horizontal state in which the table 34 is pulled out rearward from the back 32 and held horizontally by rotating the table 34. In the mirror device 1 for interior use in a vehicle, the table 34 is normally in a storage state in which the table 34 is aligned with the back 32 and the mirror surface 10a is not visible, and the table 34 is rotated via the shaft member 33 to set the table 34 in a horizontal state, allowing the table 34 to be used and the mirror surface 10a to be visible. In addition, the automobile interior mirror 10 in this embodiment is preferably configured so that the inclination angle of the mirror surface 10a can be changed via a hinge.

[0063] In this way, if the automobile interior mirror 10 having the antifouling layer 10B is provided on the back surface 32 of the backrest 31 of the seat 3 on the rear seat side, the person sitting in the rear seat can comfortably groom himself / herself on the mirror surface 10a with high light reflecting performance. In addition, if the automobile interior mirror 10 having the antifouling layer 10B can be switched between a used state and a non-used state by rotating the table 34, it is useful in a usage scene where one needs to groom himself / herself, for example, when holding a web conference using a personal computer placed on the table 34. In particular, the automobile interior mirror 10 of this embodiment is useful for luxury cars.

[0064] Other embodiments (1) The antifouling layer peeling prevention step may be a step of removing the jig from first surface 11 immediately after the light reflecting layer forming step. If the jig is removed from first surface 11 under vacuum, it is possible to prevent metal compounds generated on the surface of the jig from falling onto first surface 11. Therefore, it is possible to reduce deposits 52 originating from metal compounds that adhere to first surface 11.

[0065] (2) In the above embodiment, the abundance ratio of the metal elements detected in each of the first region 111 and the second region 112 is used as the index, but a metal compound may be used as the index instead of the metal element. By using the abundance ratio of the metal compound as the index, it is possible to evaluate the abundance ratio of the deposit 52 derived from the metal compound contained in the first region 111 to the deposit 52 derived from the metal compound contained in the second region 112, so that the deposit 52 derived from the metal compound can be more reliably removed from the first surface 11.

[0066] (3) In the above embodiment, secondary ion mass spectrometry was performed on the first surface 11 to measure the metal elements contained in the first region 111 and the second region 112, but secondary ion mass spectrometry may also be performed on the antifouling layer 10B formed on the first surface 11 to calculate the abundance ratio of the metal elements contained in the first region 101B and the second region 102B. In this case, the abundance ratio of elements such as Si and F contained in the antifouling layer 10B may be used as an index. [Industrial Applicability]

[0067] INDUSTRIAL APPLICABILITY The present invention can be utilized as an automobile interior mirror used in the interior of a vehicle, and as a method for manufacturing the same. [Explanation of symbols]

[0068] 10: Automotive interior mirror, 10a: mirror surface, 10A: glass plate, 10B: antifouling layer, 10C: light reflecting layer, 11: first surface, 12: second surface

Claims

1. A glass plate having a pair of main surfaces; An antifouling layer that is laminated on a first surface, which is one of the main surfaces of the glass plate, and contains a silicon-containing compound; a light-reflecting layer that is laminated on a second surface, which is the other main surface of the glass plate, and that contains a metal element; The first surface contains the metal element so as to maintain the antifouling properties of the antifouling layer after an abrasion resistance test.

2. the first surface has a first region and a second region containing the metal element, The mirror for an automobile interior according to claim 1 , wherein the abundance ratio of the metal element contained in the first region to the metal element contained in the second region is greater than 1.

3. 3. The automobile interior mirror according to claim 2, wherein the abundance ratio of the metal element contained in the first region to the metal element contained in the second region is 2 or less.

4. The automobile interior mirror according to any one of claims 1 to 3, wherein the metal element includes Al.

5. A method for manufacturing an automobile interior mirror having a glass plate with a pair of main surfaces, comprising the steps of: A holding step of holding a first surface, which is one of the main surfaces of the glass plate, using a jig; a light-reflecting layer forming step of forming a light-reflecting layer containing a metal element on a second surface, which is the other main surface of the glass plate, by a vapor phase film formation method; an antifouling layer forming step of forming an antifouling layer on the first surface; and a step of preventing peeling of the antifouling layer to prevent peeling of the antifouling layer.

6. 6. The method for manufacturing an automobile interior mirror according to claim 5, wherein the vapor phase film formation method is vacuum deposition.

7. 6. The method for manufacturing an automobile interior mirror according to claim 5, wherein the antifouling layer peeling prevention step comprises polishing and cleaning the one main surface of the glass plate after the light reflecting layer forming step is carried out.

8. the first surface has a first region and a second region containing the metal element, The method for manufacturing an automobile interior mirror according to any one of claims 5 to 7, wherein the antifouling layer peeling prevention process is carried out when the abundance ratio of the metal element contained in the first region to the metal element contained in the second region is greater than 2.

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