Abstract
Road traffic signals of LED type and filament bulb type are now available. Especially, LED road traffic signal is beginning to be officially available everywhere, though the initial investment of LED road traffic signal is more expensive compared to a conventional signal using filament bulbs. However, there are some problems to be solved, respectively. In the road traffic signal using filament bulb, the pseudo-lighting phenomenon occurs when in the morning and evening sun altitude is low. On the other hand, the LED road traffic signal is difficult to reduce problems such as washout phenomenon. In this paper, by inserting the multi-eye lens unit and a light-shielding film in between the colored filter and reflector, we proposed a traffic signal which has no risk of pseudo-lighting and we have proposed reduction of washout phenomenon of LED signal head by using the LED element 192 and low-reflection black plate on a blank area between the elements. We report the development of a road traffic signals reducing the pseudo lighting phenomenon occurring in the bulb type and reducing the washout occurring in the LED type.
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