| 摘要 |
<p>PURPOSE:To extinguish and light a head lamp securely according to a stop and a start automatically without operation of an operator, by operating an open and close switch in a wiring diagram by a voltage obtained by conversion of car speed detecting output signal from a car speed sensor. CONSTITUTION:A car speed sensor 14 is provided at a portion which turns while an automobile is in travel motion and stops at a stop of the automobile, to generate a pulse proportional to the car speed in travel motion of the car by, for example, magnetism or light. An output signal composed of this pulse is inputted to a voltage generating circuit 15 consisting of F/V converter and converted to a DC voltage proportional to the number of pulse. And this voltage is transformed and impressed to a transistor 11 as a base voltage if necessary so as to energize a coil 12 to close an open and close switch 10 and wiring circuit 3 to light head lamps 2A, 2B. Accordingly, the pulse situation of car speed sensor 14 changes according to a stop or a start, therefore, the head lamp can be securely extinguished or lit automatically. Moreover, a lighting during a stop time is performed by a manual open and close switch.</p> |
