Optical systems for bar code scanners

Details Optical systems for bar code scanners Optical systems for bar code scanners

1991-12-24

1994-07-26

Shepperd, John

Registers

Coded record sensors

Particular sensor structure

235472, 250568, G06K 710

Patent

active

053328922

ABSTRACT:
The invention facilitates operation of a bar code reader over a wider range of working angle, a wider range of distances from the bar code and a wider range of bar code densities. The invention includes improved optics and sensing elements. To provide a wider depth of field the optics associated with the emitter and or the photodetector have two distinct focal points. In the preferred embodiments, the optics and sensing elements and/or the associated circuitry are arranged to provide two channels of data derived form the scanned bar code. The two channels have differing resolutions. Analysis of the data from the two channels provides a single decoded result. As the working angle and density vary at least one of the resolutions will be appropriate for sensing all or most of the bar coded data. The data from the channel producing a valid result can be used, or if neither channel produces a valid result by itself, data from each channel can be analyzed and valid portions of the data from both channels combined to produce the single decoded result.

REFERENCES:
patent: 3684868 (1972-08-01), Christie et al.
patent: 3727030 (1973-04-01), McMurtry
patent: 3758782 (1973-09-01), Radford et al.
patent: 3784794 (1974-01-01), Allais
patent: 3809893 (1974-05-01), Dobras
patent: 3916184 (1975-10-01), Turner et al.
patent: 4013893 (1977-03-01), Hertig
patent: 4115703 (1978-09-01), Dobras
patent: 4143809 (1979-03-01), Uebbing et al.
patent: 4675531 (1987-06-01), Clark et al.
patent: 5184004 (1993-02-01), Ueda et al.
Metlitsky, B., Laser Bar Code Scanning: A System Design and Analysis Model, Symbol Technologies publication, Jul. 1990.
Bar Code System Considerations, Symbol Technologies, Inc. publication dated Dec. 1989.
"SFH 204 Silicon Four Quadrant Photodiode," Siemens publication (undated), pp. 8-44 and 8-45.
"PBX 48 Differential Photodiode," Siemens publication (undated), pp. 8-20 and 8-21.
Symbol Technologies, Inc., "SDT: New Scanning Data Terminal-Supports Both Bar Code Reading and Manual Data Entry," Symbol MSI, Part 789 MX, 1989.

Affiliated with

Also associated with

Rating

Optical systems for bar code scanners does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical systems for bar code scanners, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical systems for bar code scanners will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1054450