| 摘要 |
PURPOSE:To prevent a battery from being fully discharged as a result of forgetting to put out a room lamp by providing an automatic return type room lamp switch so that the room lamp is put out when a door is closed in response to the on/off of the switch and the opening/closing of the door. CONSTITUTION:With a room lamp switch 2 turned on, a room lamp 1 is lighted, then when a door is closed an address switch 3 is turned off, making the output of a one-shot multivibrator 5b an H level, and an H level signal is input to OFF circuits 51, 52 through an OR circuit 50. Also the Q output SB of D-flip-flop FF4b is kept at an H level (the room lamp 1 is lighted with the switch turned off), thereby RS-FF57 and RS-FF58 are both reset, and the outut of an inverter 55 is at an L level and the output SE of AND circuit 59 is made an L level, thus a transistor 6 is made off and the room lamp 1 is put out. |
