| 摘要 |
A self-luminescence line-of-sight conducting sign which uses a thin structure to prevent snow from falling thick, can be always lighted at night time, and gives a frozen-road warning by changing the color of an LED emission at freezing. A self-luminescence traffic sign comprising a solar cell, an electric double-layer capacitor, and a circuit consisting of an LED, wherein the circuit is housed in a thin, disc-form case up to 20 mm thick, and the solar cell and the LED are disposed concentrically on the flat surface of the disc-form case with the solar cell at the center and the LED at the periphery. The case is glass-coated and coated with TiO2. In the circuit, a power supply output is discharge via a high resistance to an NAND logic charge/discharge circuit including the LED to enable always-lit-up at night time with a feeble current. The LED emission is stopped upon detecting a headlight at night time. A thermistor is provided on the input side of an LED blinking circuit to automatically change the color indication of the LED when the road temperature falls down to a freezing temperature. |
