| 摘要 |
PROBLEM TO BE SOLVED: To provide a burglar preventive gate that detects a radio wave disturbed between the gates by a wireless tag attached to goods to prevent from shoplifing installed at an entrance of a shop, and that dose not harm a fashion of a shop and does not give a pleasant feeling even when issuing alarming sound. SOLUTION: Gates 1a and 1b are made of transparent acrylic plates which optical signals can pass through, and bases 2a and 2b on which gates 1a and 1b stand have light emitting diodes 6a, 6b and 6c that emite red, green and blue light of three primary colors and have a controller which combines and regulates properly lights from light emitting diodes 6a, 6b and 6c.
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