JPH02286425A - Car window glass with solar cell - Google Patents

Abstract

PURPOSE:To accurately reduce dazzling feeling in a car due to the existence of an electrode on the back side of a solar cell by forming a colored transparent protective layer on the inner side of the car of a transparent outer plate glass with the transparent solar cell formed on the inner side of the car. CONSTITUTION:A window glass body is composed of a transparent solar cell 2 formed on the inner side of a transparent outer plate glass 1 and a transparent protective layer 3 formed on the front face side (inner side) of the solar cell 2. In this case, the protective layer 3 consists of a transparent laminated intermediate layer 4 and an inner plate glass 5 respectively, and the inner plate glass 5 is joined through the laminated intermediate layer 4 to the solar cell 2. Further, at least on of the laminated intermediate layer 4 and the inner plate glass 5 is colored. Thus, dazzling feeling in a car due to the existence of an electrode 8 on the back of the solar cell 2 is reduced by the colored protective layer 3 without damaging a feeling of openness of the inside of the car.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to automobile window glass with solar cells, and more specifically, it is most suitable for automobile sunroofs, opera windows, etc. with solar cells that have visible light transmittance. related to automobile window glass.

[Conventional technology]

In recent years, many attempts have been made to use solar cells as a power source to drive ventilation ventilators when vehicles are parked or for application in car electronics. For example, JP-A-61-11
No. 5719 discloses an automobile sunroof equipped with a solar cell.

However, in this patent, the solar cell does not have visible light transmittance, but rather aims to provide a sunroof with light-blocking properties using a non-transparent solar cell. Furthermore, although a translucent solar cell is disclosed in JP-A-63-199466, there is no provision for a protective layer. On the other hand, automobiles with a sunroof window fitted with a glass plate have become widely used to meet the demand for automobiles with a structure that provides a sense of openness for automobile drivers and passengers. Therefore, it is necessary for a solar cell to be mounted on an automobile to have visible light transmittance, and also for its protective layer to have light transmittance. However, when the protective layer is made transparent, the collector electrodes of the solar cells and the like are visible from the inside of the vehicle, which poses a problem of spoiling the exterior appearance. In addition, metals with high reflectivity (such as Ag, A
If you use Cr), the external appearance from the inside of the car will have a high reflectance, and the so-called glare will be thicker (and the driver,
There was a problem in that it caused visual fatigue for passengers.

[Problems to be Solved by the Invention] The present invention has been made to solve the above-mentioned problems of the conventional technology, and provides a solar battery-equipped vehicle that has an excellent appearance and visible light transmittance. The purpose of the present invention is to provide window glass for automobiles, especially sunroofs for automobiles.

Means for Solving Problem C] The present invention aims to achieve the above objects.
The vehicle comprises a transparent outer glass on which a translucent amorphous silicon solar cell is formed on the inside of the vehicle, and a transparent protective layer disposed on the inside of the vehicle to cover the solar cell. The present invention provides an automobile window glass characterized in that the protective layer is colored.

Preferred embodiments of the present invention will be described below based on the drawings. The automobile window glass according to the present invention includes a transparent outer glass l, a translucent solar cell 2 formed on the inside of the outer glass 1, that is, the interior side of the automobile, and a front surface of the solar cell 2. It consists of a transparent protective layer 3 formed on the exit side (inside of the car), and this protective layer 3 is made of a material that can control the transmission of visible light and has excellent penetration resistance. It becomes.

FIG. 1 shows a typical embodiment of the present invention, in which the protective layer is composed of a transparent laminated interlayer film 4 and a transparent inner glass 5. The inner glass plate 5 is joined to the translucent solar cell 2 by interposing it therebetween. Of the laminated interlayer film 4 and the inner glass 5 used as protective layers, one of the two is colored. Preferably, the laminated interlayer film 4 is colored, and the visible light rays of the interlayer film 4 are colored. Transmittance is 5-60%
It is preferable that This is because if the visible light transmittance of the interlayer film is 5% or less, the transmittance of the five window glasses as a whole will be close to 0%, which is one of the purposes of the present invention, which is to provide a feeling of openness to the driver and passenger of the vehicle. If the transmittance is insufficient, and if the transmittance is 60% or more, it is difficult to reduce the glare caused by the back electrode of the solar cell. Further, as for the color of the colored transparent laminated interlayer film 4, an appropriate color such as bronze, blue, gray, green, etc. can be selected. Further, the material of the laminated interlayer film 4 is preferably polyvinyl butyral, ethylene vinyl acetate, urethane, etc. used in laminated glass for automobiles, and the film thickness is preferably in the range of 0.3 to 0.8 m+m.

On the other hand, the colored transparent inner glass 5 contains trace amounts of iron, nickel, cobalt, etc. in the composition of soda lime glass.
Heat-absorbing glass formed by adding a metal such as selenium or a metal oxide is suitable. In addition, the color exhibited in that case depends on the metal oxide added,
There is also a relationship with metals, such as bronze, blue, gray,
An appropriate color such as green can be selected. The visible light transmittance of the transparent inner glass is 0 to 60%.
It is preferable that it is in the range of .

Moreover, as the transparent protective layer 3 of the present invention, - layer or 2
It can also consist of more than one plastic layer. For example, polyethylene terephthalate (PET) has sufficient durability and can be suitably used. Further, a urethane plastic film having self-repairing properties can also be used. In this way, when the protective layer is composed of only a plastic film, it is lightweight and has tear resistance against the human body.
i-1acerative) can be provided.

In the present invention, the translucent amorphous solar cell 2 formed on the inside surface of the transparent exterior glass 1 is not particularly limited, but may contain fluorine, for example, as shown in FIG. A transparent incident light side electrode 6 such as a transparent conductive film whose main component is tin oxide or indium oxide containing tin, a p+l+n amorphous 9132 layer 7 as a photoelectric conversion region, and metal oxides, Ag, Cr. , A1 or the like, or a transparent back electrode 8 made of a laminate of both. p.

i, n The amorphous silicon film thickness may be 2,000 to 5,000 for transparent solar cell-equipped automobile window glass applications. 9 is the incident light electrode 6 of each solar cell and the back surface of the adjacent solar cell This is a grid electrode made of, for example, Ag, to which the electrode 8 is connected.

In addition, when a glass plate containing an alkali metal is used as the outer glass plate 1, an alkali barrier film 11 for preventing such alkali components from penetrating into the incident light side electrode 6 and reducing the electrical conductivity is provided. Specifically, a film 11 mainly composed of silicon dioxide, aluminum oxide, or the like may be interposed between the outer glass 1 and the incident light side electrode 6. Also, the first
As shown in the figure, a solar cell having a power extraction electrode 12 on the periphery is formed on a transparent outer glass l, and in a window glass to which a transparent protective layer 3 is bonded, such power extraction Since the electrodes are visible from the inside and outside of the vehicle, it is desirable to hide them from the perspective of appearance. It is desirable to form the light-shielding coloring [13] around the entire circumference of the window glass so as to cover the power extraction electrode 12.

The solar cell-equipped automobile window glass of the present invention uses a colored transparent protective layer as described above, and has an overall visible light transmittance of 2.
It is preferably 0% or less. This is because if the visible light transmittance is less than 20%, there will be no glare in the interior of the vehicle, and the open feeling in the interior of the vehicle will be ensured if the visible light transmittance is at least several percent.

[Function] The window glass of the present invention includes a transparent solar cell 2 formed on the inside of a transparent exterior glass l, a transparent protective layer arranged on the inside of the solar cell 2, and Since at least one of the laminated interlayer film 4 and the inner glass plate 5, which are the protective layers, is configured to use a colored member, the feeling of openness in the interior of the vehicle is not spoiled (and the automobile It is now possible to reduce the glare indoors with a colored protective layer.

[Example] Examples of the present invention will be described below.

1. 6000 fluorine-containing tin oxides, 1100 p-like amorphous 5iC, 3000 i-type amorphous silicon, n
Type amorphous silicon 300, Ag 40 as back electrode
A translucent solar cell 2 is formed by forming an inner glass 5 (thickness 2.0 mm) made of glass and a laminated interlayer film 4 made of bronze-colored polyvinyl butyral (thickness 0.75 mm, Tv). 55%) to produce a sunroof window glass. The optical properties of this sunroof window glass are shown in Table 1 along with comparative examples.

2. Comparative Example A sunroof window glass was produced in the same manner as in Example 1, except that uncolored polyvinyl butyral (film thickness 0.75 mm, Tv 90%) was used for the laminated interlayer film as a protective layer. Its optical properties are shown in Table 1.

Table 1

[Brief explanation of drawings]

FIG. 1 is a partial sectional view of an example of a solar cell-equipped automobile window glass of the present invention. l: External glass 2: Transparent solar cell 3: Protective layer
4: Laminated interlayer film 5: Inner plate glass 6: Incident light side electrode 7: Photoelectric conversion region 8: Back electrode 9 Nigellid electrode 1O: Sunlight 11: Alkali barrier film 12: Power extraction electrode 13a, 13b: Light-shielding colored layer [Effects of the Invention] As described above, the present invention uses a transparent and colored protective layer as a protective layer for a translucent solar cell, so it does not impair the sense of openness in the interior of a car, and extremely reduces interior reflection. This also has the effect of reducing the glare on the indoor side.

Claims (6)

[Claims] (1) A transparent exterior glass with a translucent solar cell made of amorphous silicon formed on the inside of the vehicle, and a colored exterior glass that covers the amorphous silicon solar cell on the inside of the vehicle. A solar cell-equipped automobile window glass characterized by having a transparent protective layer. (2) The protective layer has a structure in which a transparent laminated interlayer film and a transparent inner glass are bonded together such that the inner glass is on the inside of the vehicle, and the laminated interlayer film and the inner glass 2. The solar cell-equipped automobile window glass according to claim 1, wherein at least one of the windows is colored and transparent. (3) The solar cell-equipped automobile window glass according to claim 1 or 2, wherein the protective layer is laminated in the order of inner glass and polyvinyl butyral from the inside of the vehicle. (4) The solar cell-equipped automobile window glass according to claim 1 or 2, wherein the protective layer is laminated in the order of inner glass and ethylene vinyl acetate copolymer (EVA) from the inside of the vehicle. (5) A sunroof for an automobile with a solar cell having the structure according to any one of claims 1 to 4 and having a visible light transmittance of 20% or less. (6) The solar cell-equipped automobile window glass according to claim 1, wherein the protective layer is made of one or more plastic films laminated together.