Northern Telecom Limited

Robert R Parsons

John S Wei

A scanning device for use in a facsimile system is formed on a semiconductor substrate. The substrate has an array of apertures, the boundary of each aperture presenting a pn junction which functions as a photodetector when appropriate bias is applied through sensing and addressing circuits. A light is directed through the apertures from one side of the substrate to be incident on a document located against the other side. The boundaries of the apertures are contoured so that the photodetectors intercept light reflected from the document but are shielded from direct light. In use, the document and the scanning device are slid past one another at a rate commensurate with the rate of operation of the addressing circuit.

Growing community of inventors

Ottawa, Canada

Robert R Parsons