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Windshield sun shades
Windshield Sun Shades (also known as sun screen shades, sunscreens, car shades, sun shields, heat shields, or UV shields) are protective shields attached to a car's windshield to keep the sun from reaching the interior and help reduce the temperature inside it.
==Use==
The interior of a closed car parked in a non-shaded spot exposed to extensive sunlight can sustain sun and heat damage. Sunlight passing through the car's windshield produces the greenhouse effect, heating the interior to a temperature much higher than the outside air. Excessive heat and prolonged exposure to direct sunlight can make the dashboard fade and eventually crack, cause seat upholstery discoloration and aging, etc.
The windshield glass itself blocks most of the UV light and some of the infrared radiation. But it can't protect from the visible light that mostly penetrates through it and gets absorbed by the objects inside the car. The visible light that passes into the interior through the windshield is converted into the infrared light which, in its turn, is blocked by the glass and gets trapped inside, heating up the interior. Windshield sun shades have a reflective surface to bounce the light back, reducing the interior temperature.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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