Optical scanner with extended depth of focus

Details Optical scanner with extended depth of focus Optical scanner with extended depth of focus

1995-05-19

1997-05-06

Le, Que

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250556, 235462, 359721, H10J 314

Patent

active

056273665

ABSTRACT:
A scanner with an extended depth of focus for electro-optically reading indicia having parts of different light reflectivity, comprises a collection optical system for collecting radiation reflected from objects in the field of view along plural different optical axes and an optical detector for detecting radiation collected by the collection optical system along each of the plural different optical axes and for generating electrical output signals indicative thereof. The scanner further includes processing circuitry for processing the output signals of the optical detector by comparing the output signals of the optical detector with one another, a memory for storing the detector output signals and further processing circuitry receiving the stored output signals of the optical detector from the memory and selectively outputting one of the received signals to a decoder.

REFERENCES:
patent: 4818886 (1989-04-01), Drucker
patent: 5192856 (1993-03-01), Schaham
patent: 5210398 (1993-05-01), Metlitsky
patent: 5396053 (1995-03-01), Swartz et al.
patent: 5473149 (1995-12-01), Miwa et al.

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