Integrated Three Terminal Led Photodetector
Original Publication Date: 1983-Apr-01
Included in the Prior Art Database: 2005-Feb-07
This article describes an integrated three-terminal light-emitting/photodetecting array structure in which a light-emitting junction is formed in a gate region of the FET-type photodetecting device. The structure does not require a sense amplifier since the structure produces an output signal level which is compatible with the logic circuit, such as TTL (transistor-transistor logic). The structure is particularly adaptable to a print/photodetector head for a facsimile terminal in which the head is used for both recording an image on a recording medium and reading or sensing an image or mark on the medium.