Optical scanner lens system

Details Optical scanner lens system Optical scanner lens system

G - Physics

06

K

88/96

G06K 7/10 (2006.01)

Patent

CA 1296207

ABSTRACT OF THE DISCLOSURE: An optical element that is particularly suit- able 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 includes three surfaces, one of which in preferred form is decentered with respect to the element optical axis and forms with another surface an opposed pair used to control the output of a source to illuminate bar codes. The remain- ing surface, the third, is prismatic, either converging or diverging as required, and is structured to cooperate with part of one of the paired opposed surfaces to conduct light reflected from a bar code to a small photodetector for conversion to electrical form. Over- corrected spherical aberration is used to control the intensity, depth, and surface coverage of illumination so that the probe performance does not change for bar codes positioned anywhere throughout a predetermined working depth.

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