JPH07132774A - Glade shield mirror - Google Patents

Abstract

PURPOSE:To provide a necessary reflection factor and to provide a sufficiently increased life also during non-glare shield through a reflection factor during glare shield can be sufficiently reduced. CONSTITUTION:In a glare shield mirror 1 which is constituted such that a reflection factor is variable by providing on the back of a glass base sheet 2 with a transparent electrode film 3, an EC film, 4 and a reflection film and electrode film 5, a reflection preventing film 6 is formed on the surface of the glass base sheet 2. Since a reflection factor originally available on the surface of the glass base sheet 2 is sufficiently reduced by a reflection preventing film 6 formed on the surface of the glass base sheet 2, a reflection factor during glare shield is sufficiently reduced. Besides, a necessary factor is also provided during non-glare shield, and only by applying a voltage of the same level as that of conventional constitution treatment is achieved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an EC anti-glare mirror (electrochromic anti-glare mirror), a liquid crystal anti-glare mirror, and the like, which are configured to be variable in reflectance.

[0002]

2. Description of the Related Art An EC antiglare mirror has conventionally been formed by laminating a transparent electrode film, an EC (electrochromic) film, and a reflective film / electrode film in this order on the back surface of a glass substrate. The transparent electrode film is composed of, for example, an ITO film, and the EC film is an IrOx film, a Ta2O5 film and a WO film.
It is composed of three membranes. The reflective film / electrode film is composed of, for example, an Al film. In this structure, when a direct current voltage is applied between the transparent electrode film and the electrode film also serving as a reflection film, an oxidation-reduction reaction occurs and the IrOx film of the EC film and the WO film are formed.
3 The film causes a coloring reaction, which reduces the reflectance of the EC anti-glare mirror because the incident light entering the Al film and the reflected light reflected by the Al film are weakened by the colored IrOx film and WO3 film. And it becomes an anti-glare state. Also,
When the application of the DC voltage is reversed, a reverse reaction of the redox reaction occurs, the IrOx film and the WO3 film return to transparent, and the EC antiglare mirror has a high reflectance and is in a non-antiglare state. ing.

[0003]

In the above conventional structure, since the glass substrate is made of soda glass, for example, the reflectance on the surface of the glass substrate is about 4%. For this reason, even if a DC voltage is applied to the EC anti-glare mirror to keep it in an anti-glare state, the above-mentioned reflectance of about 4% remains as it is without being weakened. Is limited to about 14 to 15%, and it cannot be said that the reduction in reflectance during antiglare is sufficient.

On the other hand, it is possible to use a colored glass as the glass substrate to sufficiently reduce the reflectance in the anti-glare state. In this case, the reflectance in the non-glare state is considerably high. Since it is lowered, there is a drawback that the necessary reflectance cannot be obtained when the anti-glare is not performed. Also, a method of increasing the DC voltage applied to the EC anti-glare mirror to increase the degree of coloring of the EC film can be considered, but in this case, the EC anti-glare mirror is severely deteriorated and the life is shortened. There was a flaw.

Therefore, an object of the present invention is to make it possible to sufficiently reduce the reflectance at the time of anti-glare, to obtain the necessary reflectance even at the time of non-glare, and to make the life sufficiently long. There is to provide an anti-glare mirror that can.

[0006]

The antiglare mirror of the present invention comprises:
An anti-glare mirror having a structure in which the reflectance can be varied by providing an electro-optical element such as EC or liquid crystal and a reflective film on the back surface of a glass substrate, characterized in that an antireflection film is provided on the surface of the glass substrate. Have.

[0007]

According to the above means, since the antireflection film is provided on the surface of the glass substrate, the reflectance originally on the surface of the glass substrate can be sufficiently reduced. Therefore, when the anti-glare mirror is set to the anti-glare state, the reflectance originally present on the surface of the glass substrate is hardly added, and accordingly, the reflectance of the entire mirror in the anti-glare state is reduced. As a result, the reflectance at the time of antiglare can be sufficiently reduced. In this case, since the reflectance originally on the surface of the glass substrate is simply reduced, the required reflectance can be obtained even in the non-glare state. Further, since it is only necessary to apply a voltage of the same level as that of the conventional configuration to the electro-optical element such as EC or liquid crystal, it is possible to sufficiently extend the life.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a thin film type EC antiglare mirror will be described below with reference to FIG. In FIG. 1, a transparent electrode film 3 made of, for example, an ITO film is formed on the back surface (lower surface in FIG. 1) of the transparent glass substrate 2 of the EC anti-glare mirror 1. The transparent electrode film 3 is for an electrode main portion 3a corresponding to almost the entire back surface of the glass substrate 2 and for a terminal arranged at the left end portion of the back surface of the glass substrate 2 and separated from the electrode main portion 3a through a slit. Separate electrode 3b. An EC (electrochromic) film 4 is formed on the lower surface of the electrode main portion 3a of the transparent electrode film 3.
Also, the reflective film / electrode film 5 is sequentially laminated.

The EC film 4 is, for example, an IrOx film or Ta film.
It is formed by laminating a 2 O 5 film and a WO 3 film in this order from the top. Here, the IrOx film is an oxidative coloring film, and Ta2
The O5 film is an electrolyte film and the WO3 film is a reduction coloring film. The reflection film / electrode film 5 is made of, for example, an Al film, and is connected to the separation electrode 3b at its left end. Each of the above films is formed by a thin film forming technique such as vapor deposition, and the total thickness of the laminated film formed by laminating the films is about 1.2 microns.

The surface of the glass substrate 2 (upper surface in FIG. 1)
Is provided with an antireflection film 6. The antireflection film 6 is composed of, for example, a MgF2 film, and is formed by vacuum vapor deposition so that the film pressure is, for example, about 100 nm. In this case, by forming the MgF2 film, the reflectance on the surface of the glass substrate 2 is about 2%.
It is configured to reduce to a certain degree. As shown in FIG. 1, the principle of reducing the reflectance in this way is that incident light A is reflected on the front surface and the back surface of the antireflection film 6, and the reflected light A1 and A2 interfere with each other to cause surface reflection. This is to reduce it.

The material of the antireflection film 6 is M
Instead of gF2, SnO2, Al2O3, TiO2, Z
nO, SiO2, Ta2 O5, WO3, CeO2, Ce
It is also preferable to use F3, ZrO2 or the like.
Further, although the single layer film is made of one material, it is more preferable that, instead of the single layer film, two or four kinds of the plurality of materials are appropriately combined to form a multilayer film.

On the other hand, terminals 7 and 8 are attached to the left and right ends of the glass substrate 2. These terminals 7 and 8
Has fitting portions 7a and 8a having a U-shaped cross section, and these fitting portions 7a and 8a are fitted to the left and right ends of the glass substrate 2. In this case, the fitting portions 7a and 8a are configured such that the glass substrate 2, the antireflection film 6 on the upper surface thereof and the transparent electrode film 3 on the lower surface thereof are fitted. The terminal 8 on the right side is in contact with and connected to the electrode main portion 3a of the transparent electrode film 3. The left terminal 7 is in contact with the separation electrode 3b of the transparent electrode film 3 and is thus connected to the reflective film / electrode film 5. A protective glass plate 8 is attached to the lower surface of the reflective film / electrode film 5 via a sealing resin 9. In addition, the glass substrate 2 is formed by the sealing resin 9.
Each film provided on the back surface side of is covered and sealed.

In the case of this structure, the transparent electrode film 3 (electrode main portion 3a) is connected to the positive electrode terminal of the DC power source, and the reflective film / electrode film 5 is connected to the negative electrode terminal of the DC power source. When a direct current voltage is applied between the EC film 4 and the EC film 4, an oxidation-reduction reaction occurs in the EC film 4.
The O3 film is configured to cause a coloring reaction. When the IrOx film and the WO3 film of the EC film 4 are colored,
As shown in FIG. 1, the EC anti-glare mirror 1 is weakened by the colored IrOx film and WO3 film for the incident light A entering the reflective film / electrode film 5 and the reflected light B reflected by the reflective film / electrode film 5. Therefore, the reflectance decreases and the antiglare state occurs. On the other hand, when a DC voltage opposite to the above is applied between the two electrode films 3 and 5, a reaction opposite to the above-mentioned redox reaction occurs in the EC film 4, so that the IrOx film and the WO3 film of the EC film 4 are formed. Is made colorless (returns to a transparent state). As a result, the EC anti-glare mirror 1 returns to its original reflectance and becomes high, and enters the non-anti-glare state.

Now, as a result of measuring the reflectance of the EC anti-glare mirror having the conventional structure (without the anti-reflection film), the result of measuring the reflectance of the EC anti-glare mirror 1 (with the anti-reflection film 6) of the present embodiment, In addition, the results of measuring the reflectance of the EC anti-glare mirror of the modified example (the anti-reflection film 6 made of a different material) are shown in the following table.

[0015]

[Table 1] As is clear from this table, the EC anti-glare mirror 1 of the present embodiment can sufficiently reduce the reflectance during anti-glare as compared with the conventional configuration. It should be noted that, although the reflectance when non-glare is also reduced, there is almost no problem in the reduction of reflectance to this extent, and the required reflectance can be sufficiently obtained even when non-glare. Further, since it is only necessary to apply the same level of voltage to the EC film 4 as in the conventional configuration, the life can be sufficiently lengthened.

On the other hand, the antireflection film provided on the surface of the glass substrate of the EC antiglare mirror of the modified example is, for example, a five-layer antireflection film. As is clear from the above table, the EC anti-glare mirror of this modified example can sufficiently reduce the reflectance during anti-glare as compared with the conventional configuration, and also has a sufficient reflectance required during non-glare. Obtainable.

In the above-mentioned embodiments and modified examples, the structure is applied to the EC anti-glare mirror 1. However, the structure is not limited to this. For example, the structure may be applied to a liquid crystal anti-glare mirror. is there.

[0018]

As is apparent from the above description, the present invention has the antireflection film provided on the surface of the glass substrate, so that it is possible to sufficiently reduce the reflectance at the time of antiglare.
It has an excellent effect that the required reflectance can be obtained even in the non-glare state and the life can be sufficiently extended.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of an EC anti-glare mirror showing an embodiment of the present invention.

[Explanation of symbols]

1 is an EC anti-glare mirror, 2 is a glass substrate, 3 is a transparent electrode film, 3a is an electrode main part, 3b is a separation electrode, 4 is an EC film, 5
Is a reflection film / electrode film, 6 is an antireflection film, and 7 and 8 are terminals.

Claims (1)

[Claims] 1. An anti-glare mirror having an electro-optical element such as EC or liquid crystal and a reflective film provided on the back surface of a glass substrate so that the reflectance can be varied, wherein an anti-reflection film is provided on the surface of the glass substrate. An anti-glare mirror characterized by being provided.