| 摘要 |
PURPOSE:To continue to maintain a lighting condition always so that light is not put out or reduced at extinction time, at trouble time or at switching time or the like of a discharge lamp of a vehicular headlamp. CONSTITUTION:When extinction is caused, in the first place, a lighting discriminating circuit CP1 outputs an unlighted condition 1. When a signal does not come from an operation switch SW1, since multivibrators MV1 and MV2 carry out (1) output and multivibrators MV3 and MV4 carry out (0) output, (1) is outputted from a NOR gate NOR1. Next, (1) is also outputted from an AND gate AN2, and a flip-flop circuit FF1 is reversed by receiving this, and an exclusive OR circuit E0R1 outputs (O), and a switch Swo is switched to Low from Hi. At the same time, (1) is outputted from an AND gate AN1, and a reset signal is sent to a lighting device Bao, and a high voltage pulse is generated from an ignitor Ig1, and a lamp La1 is lighted after necessary time for starting passes. |
