DRIVING CIRCUIT OF SEMICONDUCTOR-TYPE LIGHT SOURCE FOR VEHICLE LIGHTING DEVICE AND A VEHICLE LIGHTING DEVICE

摘要

In a conventional driving circuit, it has been inefficient and difficult to measure, classify, and rank Vf characteristics of a light emitting element that is in a bare-chip state. According to the present invention, a semiconductor-type light source is made of four light emitting chips 41 to 44 that are in a bare-chip state, the light emitting chips being randomly mounted on a board 3 without classifying Vf characteristics in advance. As the resistors, opening resistors R2, R4, R6 and trimming resistors R1, R3, R5 are disposed in parallel and then are connected in series to the four light emitting chips. Values of the resistors are adjusted so that a predetermined set current value or luminous flux value is reliably obtained with respect to the four light emitting chips. As a result, the present invention is capable of efficiently and easily mounting the four light emitting elements 41 to 44 and the resistors R1 to R7 on the board 3.