| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent a headlight from uselessly lighting, prolong the life of the lamp, and ensure visibility at dusk, by putting out lights in the bright circumference and lighting in the perfect darkness and lighting only a lamp for side eye built in the headlight at dusk. SOLUTION: Voltage V of the connection point of a CdS optical sensor 21 changing the resistance value according to illuminance and resistance R2 is impressed of the minus (-) input terminals of a comparator ICA and a comparator ICB. Reference voltage V1 is impressed from the connection point of resistance R3 and resistance R4 on the plus (+) input terminal of the comparator ICA, and reference voltage V2 is impressed from the connection point of resistance R5 and resistance R6 on the (+) input terminal of the comparator ICB. The resistance value of the CdS optical sensor 21 is changed according to illuminance, and hence comparative V output from the connection point of the resistance R2 and the CdS optical sensor is changed. According to change of the comparative voltage V at night, at dusk, and in the daytime, output of the comparator ICA and the comparator ICB are changed.</p> |
