Control circuit for interior lamp of automobile

Abstract

Abstract PURPOSE:To prevent a lamp from being left lighted, by putting out the lamp when a push switch is turned on and by incompletely lighting the lamp when a door switch is turned off and by fully lighting the lamp when any of the switches is turned on. CONSTITUTION:When electric power is applied and a push switch 1 is turned on, a lamp 107 is fully lighted. When the switch 1 is turned on again, an AND circyit 11 sends out a differentiation wave signal and the base current of a transistor 105 vanishes and the transistors 105, 106 are turned off so that the lamp 107 is put out. When a door is opened and a door switch 2 is turned on after the putting-out of the lamp 107, the output signal Q of a flip-flop 34 drives integrated circuits 91, 95 to fully light the lamp. When the door switch 2 is turned off, a pulse signal is taken out of the IC91 and applied to the base of the transistor 105 so that the lamp 107 is lighted and then gradually put out. When the door switch 2 is turned on again, the flip-flop 34 is inverted by a trigger signal so that the output Q of the flip-flop is made high to light the lamp 107.

Inventors

• 👤 Kiichiro Shimura
• 👤 志村　喜一郎

Bibliographic Details