Patent ID: 7964988

Claim:
A lighting controller of a lighting device for a vehicle comprising: a switching regulator for supplying a driving current to first to Nth (where N is an integer of one or more) semiconductor light sources; first to Nth current driving means comprising: first to Nth current detecting portions connected in series to the semiconductor light sources and serving to detect the driving current respectively, first to Nth switching portions connected to positive electrode sides of the semiconductor light sources respectively, and first to Nth comparing portions for transmitting a comparing output corresponding to a result of a comparison, which is obtained by comparing values of the driving currents detected by the current detecting portions with a predetermined threshold respectively, wherein the first to Nth current driving means serve to carry out operations of the switching portions corresponding to the comparing output respectively; and control means comprising: first to Nth first voltage drop detecting portions for detecting voltages on output sides of the comparing portions and transmitting first to Nth first detection results, and first to Nth second voltage drop detecting portions for detecting voltages on positive electrode sides of the semiconductor light sources and transmitting first to Nth second detection results respectively, wherein the control means controls the first to Nth current driving means corresponding to the first to Nth first detection results and the first to Nth second detection results respectively.