An optical element that is particularly suitable for use in the optical system of a hand-held probe to conduct light to and from bar codes as they are scanned or read for information. The element preferably is integrally formed as a single piece fabricated of optical plastic by injection molding and...http://www.google.com/patents/US4675531?utm_source=gb-gplus-sharePatent US4675531 - Optical scanner having a multi-surfaced lens arrangement for producing a rotationally symmetric beam
