| 摘要 |
PURPOSE:To safely unlock a door by radiating an electromagnetic wave of a specific frequency to a door vicinity from a transmitter provided on a door side, and providing a resonance circuit, enabling a door lamp to be lit only when conforming to the frequency, on a key. CONSTITUTION:A lighting system is divided into a door side and a key side, and is composed by equipping the door side with a power source part 3, radio transceiver part 4, transmission antenna 6, control part 8, and lamp 10, and providing an antenna 12 and a resonance circuit 14 on the key side. The radio tranceiver 4 is formed with a transmission part 4a and a receiving part 4b, and an electric signal of a specific frequency is constantly radiated as an electromagnetic wave to a door periphery from the antenna 6 from the transmission part 4a. Then when a person, bringing a key corresponding to the electromagnetic wave, nears the door side, the electromagnetic wave is received with the antenna 12 of the key side, resonance current flows in the resonance circuit 14, and this is received with the receiving part 4b of the door side to light the lamp 10. This enables easy unlocking. |
