VEHICLE-MOUNTED ELECTRIC JUNCTION BOX, AND CIRCUIT MATERIAL AND CIRCUIT UNIT TO BE USED THEREFOR

摘要

Provided is a vehicle-mounted electric junction box wherein the durability thereof is improved while the cost thereof is reduced. In particular, a vehicle-mounted electric junction box wherein adverse effects due to temperature are eliminated. A circuit material (11) to be housed in the vehicle-mounted electric junction box is a metal core substrate (11a) having a metallic core plate (21) as the core thereof, and the core plate (21) has a divided section (25) that is partitioned from a main body section (24) by a dividing slot (23) filled with an insulation material (22). Electronic parts (12, 13) are mounted on both a portion that comprises the main body section (24) and a portion that comprises the divided section (25). When mounting the electronic parts (12, 13), the heat-resistance temperature or the heat-generation temperature of the electronic part (12) to be mounted on the portion that comprises the main body section (24) and the electronic part (13) to be mounted on the portion that comprises the divided section (25) are made to be different, and any effect by heat from one to the other of the electronic parts is eliminated by adjusting the width of the dividing slot (23).