| 摘要 |
PURPOSE:To prevent an illuminating direction from being directed to where it is unexpected, and secure safety at the time if driving at night, by fixing the illuminating direction of a lighting device to the front for a while till a rectilinear steering state is judged after an ignition switch is turned on. CONSTITUTION:When an ignition switch is turned off, no voltage is impressed on a resistor R5 of an illumination direction fixing circuit 6, whereby a reset signal of '1' is inputted into the R input of an FF circuit 61 via an inverter 62. If so, Q output of the FF circuit 61 comes to '0' and this signal is inputted in the other end of NAND gate 30a-30f and a negative logic input-output OR gate 30g of a processing circuit 2. In consequence, only an output terminal 2g of this processing circuit 2 comes to '0' so that a lamp driving unit 3 will not operate. And, when the said switch is turned on and the specified distance signal passes through an AND gate 51 of a restilinear steering state judging circuit 5, a set signal is inputted into the S input of an FF circuit 53 via a divider 52. |
