Patent ID: 6870176

Claim:
A surface mountable cadmium sulfoselenide optocoupler, said optocoupler comprising: a substrate made of optically opaque, electrically insulating material, metallized so as to provide conductive traces on a top surface thereof, said traces being electrically linked to metal pads on a bottom surface; a cadmium sulfoselenide photoresistor having an active surface, placed over said substrate with said active surface facing said substrate, said photoresistor having two electrodes; metal leads electrically connecting each of said two electrodes of the photoresistor to two metallized traces on said substrate; a light emitting diode (LED) chip, mounted on said same substrate, facing said active surface of the photoresistor and having a top and bottom electrode, where said bottom electrode is electrically attached to a third metallized trace on said substrate, and said top electrode is wire bonded to still another metallized trace; and a cover made of optically opaque material, fixed to said substrate so as to enclose the photoresistor and the LED chip in a light tight enclosure.