JPH0529641A - Solar battery device - Google Patents

Abstract

PURPOSE:To provide a colorful solar battery device to widen uses as the outer package component. CONSTITUTION:The front face of the solar battery periphery of a solar battery 2 and an electric apparatus 1 is provided with a coloration means layer 4 which transmits at least a partial wavelength region of the light contributing to power generation of the solar battery 2 and reflects other visible wavelength regions. An encapsulated cholesteric liquid crystal dispersively applied on the binder or a cholesteric polymer sheet is used as the coloration means layer 4. These selectively scatter a visible specified wavelength of light and transmit remaining light. The dial shows selective scattering colors of the cholesteric liquid crystal and therefore does not allow the presence of a solar battery hidden behind to be discriminated from the outside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar cell device.

[0002]

2. Description of the Related Art Conventionally, single crystal silicon or amorphous silicon is used as a solar cell, and the solar cell is built into a clock, a calculator, a radio, or a power generation device in a solar system. .

[0003]

However, since the solar cell has been used as it is in the past, almost the color of the solar cell itself, which is close to black, can be seen as it is, which is not preferable as an exterior part. Also, when the size of a solar system becomes large, the surrounding atmosphere becomes dark,
It was not environmentally favorable either.

An object of the present invention is to provide a colorful solar cell device for expanding its use as an exterior part.

[0005]

A solar cell device according to the present invention comprises a coloring means layer which transmits at least a part of a wavelength region of light contributing to power generation of a solar cell and reflects another visible wavelength region. It is provided on the front surface of the solar cell.

[0006]

1 and 2, an electric device 1 with a solar cell is a timepiece, and a solar cell 2 is fitted so that its front surface is flush with the front surface of a dial. The solar cell peripheral portion 3 of the electric device 1, that is, the surface of the dial plate in this case, is painted so as to have the same color as the solar cell 2, and is colored black or a color close thereto. Of course, the solar cell peripheral portion 3, that is, the dial plate itself may be black. Coloring that transmits at least a part of the wavelength region of light that contributes to the power generation of the solar cell 2 and reflects other visible wavelength regions on the front surface of the solar cell 2 and the solar cell peripheral portion 3 of the electric device 1. A means layer 4 is provided. Amorphous silicon or single crystal silicon is currently in practical use as the solar cell 2, and the wavelength contributing to power generation of the solar cell when using these is as shown in FIG. As the coloring means layer 4, a microcapsule of cholesteric liquid crystal dispersed in a binder and applied, or a cholesteric polymer sheet is used. These selectively scatter light having a specific wavelength in the visible range and transmit the remaining light. It is better to shift the scattered wavelength range from the wavelength range that contributes to the power generation of the solar cell 2, but the light in the wavelength range that is selectively scattered is not completely blocked and almost half of the light is transmitted, so it is visible. Even if the coloring means layer 4 that selectively scatters any color in the region is used, power generation is not stopped. However, it goes without saying that it is better to shift them in order not to reduce the power generation efficiency. For example, when a blue cholesteric liquid crystal is used as the coloring means layer 4, the light transmittance thereof is shown by the curve A in FIG. Therefore, in this case, even if the solar cell 2 is made of amorphous silicon or single crystal silicon, the power generation efficiency is hardly reduced. In this embodiment, the dial plate shows the selective scattering color of the cholesteric liquid crystal, which is indistinguishable from the outside when the existence of the solar cell hidden behind it is seen.

FIG. 4 and FIG. 5 show an example in which an electronic desk calculator is used as the electric device 11. Here, the peripheral portion 13 of the solar cell 12 surrounds the display portion 14 of the calculator and is coated with the same black paint 15 as the solar cell, and the coloring means layer 16 is provided on the front surface thereof. As the coloring means layer 16, a dichroic mirror-1 is provided on the back surface of the transparent front glass plate 117.
8 is provided, and the diffusion transmission layer 19 is provided on the front surface of the glass plate. As the diffusion transmission layer 19, a matte clear lacquer may be sprayed, a polyester film may be attached, and the glass plate 17 may be plastized.

The diffuse transmission layer 19 is for making the color of reflected light look bright, and without it, it looks dark. The dichroic mirror 18 selectively reflects light having a specific wavelength in the visible range and transmits the remaining light. Therefore, the transmitted light contributes to the power generation of the solar cell 12. Note that a multilayer interference filter such as a cold mirror may be used instead of the dichroic mirror. In FIG. 6, the curve showing the transmittance of the blue dichroic mirror 18 is DM, and the curve showing the transmittance of the cold mirror is CM.
Express with. For example, if amorphous silicon is used as a solar cell and a blue dichroic mirror is used,
Almost no reduction in power generation efficiency. Further, when using a cold mirror, it is found that single crystal silicon is better than amorphous silicon for the solar cell 12.
In this embodiment, the dichroic mirror 18 is provided with a cutout in the shape of a character so that a black cutout mark can be displayed on the background. It goes without saying that patterns such as patterns can be provided in addition to characters. In FIG. 5, 20 is a liquid crystal panel for display. The incident light passes through the diffuse transmission layer 19, the light of a specific wavelength region, for example, blue is reflected by the dichroic mirror 18, and then goes out through the diffuse transmission layer 19 again, and finally this portion looks blue. On the other hand, the light transmitted through the dichroic mirror 18 reaches the solar cell 12 and contributes to power generation. In the portion where the dichroic mirror 18 is cut out, most of the light that has passed through the diffuse transmission layer 19 is absorbed by the solar cell 12, and it appears black. Eventually, the display portion 14 is surrounded by a blue border, and a black mark is displayed in the display portion 14 so that the presence of the solar cell 12 is not an issue.

In the embodiments shown in FIGS. 1 and 2, cholesteric liquid crystal is used as the coloring means layer 4, and in the embodiments shown in FIGS. 4 and 5, the dichroic mirror 18 and the diffusion transmission layer 19 are used as the coloring means layer 16. However, the coloring means layer is not limited to these,
More simply, for example, a color filter that transmits light in a wavelength range that contributes to power generation of a solar cell and absorbs other light is used, and its back surface has a reflectance of 30 to 50% and a transmittance of 60 to 40.
% White diffusion layer may be provided. further,
Only the color diffuser may be used.

[0010]

Since the solar cell device according to the present invention is colorful, it has a large degree of freedom in design, and has a wide range of uses as an exterior part. When the solar system is installed outdoors as a solar system, it can brighten the environment.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the present invention.

2 is an explanatory diagram of the embodiment of FIG. 1. FIG.

FIG. 3 is a graph showing the relative output of a solar cell and the transmittance of a cholesteric liquid crystal.

FIG. 4 is a front view of another embodiment of the present invention.

5 is a cross-sectional explanatory view of a main part of the embodiment of FIG.

FIG. 6 is a graph showing the relative output of a solar cell and the transmittance of a dichroic mirror and a cold mirror.

[Explanation of symbols]

2, 12 ... Solar cell 4, 16 ... Coloring layer

Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location G06F 1/00 7927-5B

Claims (5)

[Claims] 1. A solar cell device comprising a coloring means layer provided on the front surface of the solar cell, the coloring means layer transmitting at least a part of the wavelength range of light contributing to power generation of the solar cell and reflecting the other visible wavelength range. 2. The solar cell device according to claim 1, wherein the coloring means layer comprises microcapsules of cholesteric liquid crystal dispersed and applied in a binder. 3. The solar cell device according to claim 1, wherein the coloring means layer is made of a cholesteric polymer sheet. 4. The coloring means layer is a dichroic mirror.
The solar cell device according to claim 1, wherein a diffusion transmission layer is provided on the front surface of the solar cell. 5. The solar cell device according to claim 1, wherein the coloring means layer is formed by stacking a white diffusion layer on a color filter.