Light control apparatus for automobile

Claim 1

A light control apparatus for an automobile comprising a casing having a plurality of walls defining a chamber therein, said casing further having an opening at a selected one of said walls, a selected another of said walls having a plurality of holes therein, and an outer shell projecting adjacent said another wall; a mounting plate adapted to radiate heat and mounted within said casing, said mounting plate having at least one terminal section inserted through one of said holes and accommodated in the outer shell which functions as a terminal housing and said mounting plate having a power transistor mounted thereon, said terminal section also being formed to function as a heat-radiating member; a substrate mounted on said mounting plate and adapted to serve as a printed board including a printed resistor coating and electronic parts; and a knob provided movably within said casing and having a variable resistor terminal adapted to slide over said resistor coating upon said movement within said casing, part of said knob projecting from said casing through said opening for manual operation, wherein said mounting plate is channel-shaped and has a main section and a pair of first and second wing sections elevated above the main section, said at least one terminal section extending from a top of the first wing section, said substrate bridging over the wing sections and said main section of the mounting plate being separated with a gap formed therebetween on account of a difference of elevation of the wing sections and the main section, said power transistor mounted within said gap.