Title:
SELF-LUMINESCENCE TRAFFIC SIGN
Document Type and Number:
WIPO Patent Application WO/2006/106789
Kind Code:
A1
Abstract:
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.
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Inventors:
HAYAKAWA ISAMU (JP)
Application Number:
PCT/JP2006/306587
Publication Date:
October 12, 2006
Filing Date:
March 30, 2006
Export Citation:
Assignee:
IZM CO LTD (JP)
HAYAKAWA ISAMU (JP)
HAYAKAWA ISAMU (JP)
International Classes:
E01F9/619; E01F9/615; G08G1/095
Foreign References:
| JP2000314113A | 2000-11-14 | |||
| JP2004353440A | 2004-12-16 | |||
| JP2000054325A | 2000-02-22 | |||
| JP2001034214A | 2001-02-09 | |||
| JP2002256520A | 2002-09-11 |
Attorney, Agent or Firm:
Nomura, Yasuhisa (8-20 Nibancho, Chiyoda-k, Tokyo 84, JP)
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