APPARATUS FOR AUTOMATICALLY LIGHTING UP LIGHT OF AUTOMOBILE DRIVEN ON SUNSET OR AT NIGHT AND ALARMING FOR NO-LIGHT DRIVE

摘要

PURPOSE:To prevent the no-light drive particularly on sunset by using a photosemiconductor which generates an output at the time when the natural light in a car compartment reduces to a certain illumination intensity and generating the alarm for urging the lighting up of the lamps when an output is generated from the semiconductor. CONSTITUTION:When the environment becomes gradually dark on sunset, also the illumination intensity of the natural light 2 in the car compartment reduces, and the resistance value of a photosemi-conductor CDS becomes high. Then, the electric current (i) which flows in a variable resistor R starts to flow in the base of a transistor TR1. When the illumination intensity of the natural light 2 lowers to a certain value, each collector current of TR1 and TR2 which are darlington-connected generates the saturated state, and TR3 and TR4 are turned ON, and a buzzer 6 and an alarm lamp 7 are intermittently connected and disconnected alternately, and electric conduction is carried out. Therefore, a driver is informed of the no-light drive.