MEMS-based electro-optical reader and method with extended...

Details MEMS-based electro-optical reader and method with extended... MEMS-based electro-optical reader and method with extended...

2006-09-29

2008-09-30

Paik, Steven S (Department: 2887)

Registers

Coded record sensors

Particular sensor structure

C235S454000, C235S462010, C235S462270, C235S462360, C235S462450, C359S298000

Reexamination Certificate

active

07428999

ABSTRACT:
A MEMS-based reader has an extended range of working distances for reading bar code symbols. A digitizer resolves the edges of bar code symbols when located at far-away distances from the reader within the working range. The digitizer includes a differentiator for differentiating the analog signal to generate a first derivative signal, a peak detector for detecting voltage peaks in the first derivative signal, and a comparator for comparing voltage drops after the voltage peaks with a predetermined voltage value, and for determining the presence of each edge when each voltage drop at least equals, and preferably exceeds, the predetermined voltage value.

REFERENCES:
patent: 5446272 (1995-08-01), Barkan
patent: 5828050 (1998-10-01), Barkan
patent: 6155490 (2000-12-01), Ackley
patent: 2003/0062422 (2003-04-01), Fateley et al.
patent: 2004/0245338 (2004-12-01), Poloniewicz

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