| 摘要 |
PURPOSE:To improve the controllability by detecting effectively a light from the front which is either a head light from a car running in the opposite direc tion or a tail light from a car running ahead so as to allow a head light to be automatically switched over to the low beam side. CONSTITUTION:NO.2 light receiver 10 is adapted where the receiver is composed of a condensing lens 11, a low bus optical fiber 12 which cuts off the long wave length of more than, e.g. 580nm, and of light receiving element 13 which is sensitive to the wave length, e.g. from 400-600nm. In addition, NO.1 light receiver 20 is also adapted, NO.1 receiver is composed of a condensing lens 21 and of a light receiving element 22 which is sensitive to the wave length, e.g. from 400-1,100nm. The output from NO.2 receiver 10 is inputted into a voltage comparator 70 by way of a voltage amplifier 30, a voltage comparator 40, and a variable gain voltage amplifier 60. And the output from NO.1 receiver 20 is also inputted into the voltage comparator 70 by way of a voltage amplifier 50 and a variable gain voltage amplifier 60. And when the output from the voltage comparator 70 represents a 1, a switching relay 80 is allowed to be turned on permitting a head light to be changed over to a low beam. |
