Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1995-10-05
1998-04-28
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250225, 235462, G06K 710
Patent
active
057448159
ABSTRACT:
An optical reader for reading indicia such as bar codes comprises a first and second light source for generating first and second light beams of mutually orthogonal polarization orientations, and a polarized beam splitter for combining the beams without the effects of parallax or vignetting. One of the light sources is a short range light source and the other is a long range light source. The reader may be a scanner or a field of view reader. In addition, an optical reader is provided capable of reading all 2D symbologies comprising a flying spot laser scanner arrangement and a field of view reader. The respective laser sources generate light at different wavelengths and a dichroic filter is provided to allow either system to be used without parallax effects. The laser scanner beam can be used to aim the reader when carrying out field of view reading. An optical reader is further provided including a band-pass filter shaped to match the wave-front of light generated at a given location incident on the filter to reduce the band-pass bandwidth and hence the ambient noise. The shaped band-pass filter can be incorporated in the optical reader dichroic filter arrangement.
REFERENCES:
patent: 4105926 (1978-08-01), Reno et al.
patent: 4939355 (1990-07-01), Rando et al.
patent: 5010241 (1991-04-01), Butterworth
patent: 5479011 (1995-12-01), Rudeen et al.
Dvorkis Paul
Gurevich Vladimir
Krichever Mark
Metlitsky Boris
Pyo Kevin
Symbol Technologies Inc.
Westin Edward P.
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