| 摘要 |
<p>PURPOSE: To improve the operating efficiency by forming a D/A converter by setting plural sorts of output signals corresponding to the bit patterns of the input digital signals beforehand, and providing an irradiating direction moving angle converting switch to select a desired output signal value of the above output signals. CONSTITUTION: In a D/A converter 5, plural sorts of responding relation of output signal values corresponding to the bit patterns of the input digital signals are set beforehand. Here, two sorts including the first partial pressure resistance circuit which consists of partial pressure resistance circuits R1 to R7 and a resistance R, and the second partial pressure resistance circuit which consists of partial pressure resistance circuits R1' to R7' and the resistance R, are composed, and as a result, two sorts of responding relation of output signal values corresponding to the bit patterns are set. Consequently, the output of a decoder 4 is given to the D/A converter 5 having two sorts of partial pressure resistance circuits, and one output signal value selected from two sorts of output signal values is obtained. That is, one sort can be selected from two sorts of headlight irradiating direction moving angles per unit steering angle.</p> |
