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.
Highlights
The world's first high-brightness blue LED was produced in 1989
A road traffic signal head using a filament bulb is to turn on the signal light unit, by reflected the light of the source by the reflector and through the colored filter lens
Both of the bulb type and the LED type satisfy the conditions described in the traffic signal lighting specification by the National Police Agency, the LED method is found to be higher than the light intensity of bulb type
Summary
The world's first high-brightness blue LED was produced in 1989. Practical technique for manufacturing it has been established in 1993. In this way, the application to the traffic signal has become possible by RGB LED are aligned. In Japan, the experimental operation of road traffic signal LED was started in Aichi Prefecture and Tokushima. Road traffic signal lights that are designed to reduce the wash-out phenomenon occurring in the LED road traffic signal system
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