| 摘要 |
<p>PURPOSE:To reduce the number of connecting wires by producing an output signal in accordance with a difference between a set voltage which is set depending upon a take-out position of partial voltage and a reference voltage which is taken out from a reference resistance means applied with a power source voltage so as to change the illuminating angle. CONSTITUTION:The partial voltage of a set voltage take-out resistance 41 applied at its both ends with the voltage of a power source 3 is changed over by means of a manipulating means 42 in a set voltage take-out circuit 4 so as to extract a set voltage which is delivered to a reference comparing circuit 52. Comparators CP1 through CP4 compares the set voltage with reference voltages which are partial voltages V1 through V4 taken out from a reference voltage setting resistor 51, and an output signal generating circuit 53 produces an output signal so that an illuminating angle changing circuit 54 drives a d.c. motor 46 in a normal or reverse direction in order to obtain an illuminating angle corresponding to the set voltage. In this arrangement the number of connecting lines led out from the set voltage take-out circuit 4 on the passenger compartment side is only three, that is, only wires La, Lb, Lc are led out. Thus it is possible to reduce entrance of noise through a wire through-hole, and to facilitate the water-proof measure.</p> |
