Light Blocking Structure in Leadframe

A semiconductor proximity sensor (100) has a flat leadframe (110) with a first (110a) and a second (110b) surface, the second surface being solderable; the leadframe includes a first (111) and a second (112) pad, a plurality of leads (113, 114), and fingers (115, 118) framing the first pad, the fingers spaced from the first pad by a gap (116) which is filled with a clear molding compound. A light-emitting diode (LED) chip (120) is assembled on the first pad and encapsulated by a first volume (140) of the clear compound, the first volume outlined as a first lens (141). A sensor chip (130) is assembled on the second pad and encapsulated by a second volume (145) of the clear compound, the second volume outlined as a second lens (146). Opaque molding compound (150) fills the space between the first and second volumes of clear compound, forms shutters (151) for the first and second lenses, and forms walls rising from the frame of fingers to create an enclosed cavity for the LED. A layer (180) of solder is on the second leadframe surface of the pads, leads, and fingers.