| 摘要 |
A window shade device according to the present invention serving for a significant decrease in the rising of temperature within a vehicle caused by the greenhouse effect includes a multiple-ply sheet that is the main component of the window shade device and has the required qualities of mechanical strength, low weight, good reflection of solar radiation, and self-rolling capability. These qualities are granted to the shading sheet by its structure and manufacturing process. The shading sheet is composed as a multiple-ply sheet, with the plies composed of materials granting most of the required qualities and tension differences, including the self-rolling capability for rolling around one single axis. The multiple-ply sheet is stored in a container that can have low aerodynamic resistance, assembled in a suitable location on a vehicle or stationary structure. The window shade device according to the present invention is constructed in such a manner that one model will have the capability of covering practically all makes of cars. The window shade device according to the present invention remains on the roof of a car both when it is being driven and when the car is in parked position.
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