Reflective photoelectric cell with polycarbonate lens - has photodiodes cast in transparent plastics housing

摘要

Reflective photo-electric cell for use with objects disposed at different distances from the luminescent and photo diodes which are disposed side-by-side in a plastics housing of rectangular cross-section, is provided with an elongate polycarbonate lens mounted interchangeably in a pair of opposed slots in the housing. The diodes are cast in a transparent plastics material in the housing, and the interchangeable lenses have different focal length.