| 摘要 |
PURPOSE: A road sign board for preventing dew condensation is provided to improve visibility by preventing frost and dew condensation when temperature is rapidly dropped. CONSTITUTION: A road sign board for preventing dew condensation comprises a guidance plate, multiple LEDs(222), a plastic lens(228), and transparent epoxy resins(223a,223b). The guidance plate has protruded guidance characters or figures. A retro-reflection sheet(230) is attached on the top of the guidance plate. A gloss material(240) is spread on the guidance plate. The LEDs are electrically connected to the guidance plate and forms a parallel circuit. The plastic lens diffuses light from the LEDs to the top of the guidance plate.
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