| 摘要 |
PURPOSE:To prevent the reduction in the transmission range of an infrared ray signal due to decrease in indoor illuminance and in a dry battery voltage and to send a stable infrared ray signal in the wireless remote controller of the infrared ray system used for an airconditioner. CONSTITUTION:A photoconductive element Cds4 connecting to NPN transistors(TRs) Q1, Q2 of Darlington connection from an output terminal of a transmission IC2 via a current limit resistor R1 is connected for controlling a current of a 1st stage TR Q1, a 2nd stage TR Q2 connects to an infrared ray emission LED 5 and a dry battery 6 removable from a main body case 1 supplies power to the transmission IC2 and the infrared ray emission LED5. Thus, a remote control signal outputted from the transmission IC2 is sent as an infrared ray signal from the infrared ray emission LED 5 via the TRs of Darlington connection with the current control in response to the indoor illuminance and transmission output control is attained depending on the indoor illuminance. |
