Noise-reduced electro-optical readers with optical bandpass filt

Details Noise-reduced electro-optical readers with optical bandpass filt Noise-reduced electro-optical readers with optical bandpass filt

1999-02-17

1999-10-19

Hajec, Donald

Registers

Coded record sensors

Particular sensor structure

23546235, 23546242, 23547201, 250568, G06K 710

Patent

active

059693231

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: 4870274 (1989-09-01), Herbert et al.
patent: 5627359 (1997-05-01), Amundsen et al.
patent: 5744815 (1998-04-01), Gurevich et al.
patent: 5756981 (1998-05-01), Roustaei et al.
patent: 5789731 (1998-08-01), Amundsen et al.

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