Optical scanner having a multi-surfaced lens arrangement for pro

Details Optical scanner having a multi-surfaced lens arrangement for pro Optical scanner having a multi-surfaced lens arrangement for pro

1985-03-28

1987-06-23

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

235472, G06K 710

Patent

active

046755314

ABSTRACT:
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 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 remaining 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. Overcorrected 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.

REFERENCES:
patent: 3784794 (1974-01-01), Alais
patent: 3870865 (1975-03-01), Schneiderhan et al.
patent: 3916184 (1975-10-01), Turner et al.
patent: 4074114 (1978-02-01), Dobras
patent: 4115703 (1978-09-01), Dobras
patent: 4143809 (1979-03-01), Uebbing et al.
patent: 4346292 (1982-08-01), Routt, Jr. et al.
patent: 4603262 (1986-07-01), Eastman et al.

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