| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an automatic vehicular lamp turning-on/off device not malfunctioning by artificial light beams from such as a tunnel illuminating lamp and a street lighting lamp. SOLUTION: An artificial-lamp detecting circuit 4 is provided for detecting, on the basis of the output potential of a light-receiving sensor 1, flicker light beams emitted from artificial lamps such as a tunnel illuminating lamp and a street lighting lamp through its differentiating circuit 41 and its integrating circuit 42. The artificial-lamp detecting circuit 4 is connected to a comparing circuit 31 and sets a threshold potential or the output potential from the light- receiving sensor for turning on a vehicle lamp 2.</p> |
