| 摘要 |
PROBLEM TO BE SOLVED: To provide a new technological means which dispenses with a support for antenna installation, and for preventing the appearance of a road from being spoiled. SOLUTION: A traffic signal light includes: an optical unit 2 having an LED 7 and a cover member 9 having visible light permeability and covering the LED 7 in front; and a plurality of antennas 4 and 104 stored in the optical unit 2. Those antennas 4 and 104 have resonance frequencies different from each other and cover a plurality of different frequency bands. COPYRIGHT: (C)2010,JPO&INPIT
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