5mm LED: Epoxy Lamp with a Reflector-Cup Lead Frame (Kosman, US 3,821,590, 1974)

A round LED indicator lamp about 0.200 in (5 mm) across. A red GaP chip sits on a small pedestal at the focus of a paraboloid reflector cup that is part of the lead frame. A fine wire runs from the chip to the other lead. The whole is moulded in clear or tinted epoxy, with small lenses moulded into the front face to spread the light. Result: an encapsulated LED lamp visible within about ±45°, moulded many at a time on one lead frame. Source: K. J. W. Kosman and L.-P. Boivin (Northern Electric), US 3,821,590 (1974). Unknown: lead and wire metals, die attach and cure. Picture: the patent drawing.