The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 03, 2001
Filed:
Nov. 08, 1999
Raj Bridgelall, Mount Sinai, NY (US);
Edward Barkan, Miller Place, NY (US);
Stephen Shellhammer, Lake Grove, NY (US);
Joseph Campanelli, Selden, NY (US);
Joseph Katz, Stony Brook, NY (US);
Yajun Li, Oakdale, NY (US);
Daniel R. McGlynn, Brooklyn, NY (US);
Symbol Technologies, Inc., Holtsville, NY (US);
Abstract
An optical scanning system is provided for producing a signal representative of a spatial distribution of indicia having different degrees of reflectivity to light, such as a bar code (,). The system includes an optical scanner (,) for scanning beam of light over the spatial distribution of indicia (,) and for producing an electrical signal corresponding to changes in the degree of reflectivity of the indicia. A digitizer (,), responsive to detections in a predetermined characteristic of the produced electrical signal is provided. The digitizer (,) converts the detections into digital words, such digital signals having a plurality of bits. The digitizer includes a timing generation circuit (,) for producing a pulse in response to each one of the detections with a time duration representative of the degree of reflectivity of the indicia as the beam of light. A decoder converts the time duration of the pulse into the digital word having a plurality of bits. An enhancement filter (,) is also disclosed. The enhancement filter (,) modifies pulses produced by a differentiator circuit (,) used in the scanner. Such modification includes increasing the rise time, and peak level of, the pulses produced by the differentiator circuit (,).