| 摘要 |
PURPOSE:To light a lamp only under low illuminance and dispense with a spare lamp by transferring an illumination lamp from low-illuminance lighting to high-illuminance lighting, and keeping it lighted for a preset period if a low- illuminance detected signal is generated when a received output is detected. CONSTITUTION:When the illuminance in the illumination control region becomes a preset value or below, a CPU 33 outputs a low-illuminance lighting command S1 to the photo-coupler 42 of a driving section 40. A TRIAC (triode AC switch) 43 is turned on, and a stairway lamp 16 is lighted at low illuminance. When a person comes to the entrance of a stairway, a human body detecting sensor 21 generates a detected signal (m), if the signal (m) is a certain level or above, a comparing section 23 generates a human body detected signal M. A transmit ting section 25 transmits a radio signal R. The receiving section 30A of a light ing control unit 30 on a ceiling receives the signal R, and the received signal RA is inputted to the CPU 33. The CPU 33 decodes the signal RA and sends a high-illuminance lighting command SH to the coupler 42 because the lamp 16 has been lighted at low illuminance, and a timer section concurrently starts counting. High-illuminance lighting is kept until the timer section is turned off. |
