Bar code reader for scanning an area at variable sweep angles

Details Bar code reader for scanning an area at variable sweep angles Bar code reader for scanning an area at variable sweep angles

1994-09-26

1996-07-02

Pitts, Harold

Registers

Coded record sensors

Particular sensor structure

235467, G06K 710

Patent

active

055324681

ABSTRACT:
A bar code reader for reading bar codes falling within a rectangular scan area having two vertical sides, a top and a bottom is disclosed herein. The reader includes two oscillating mirrors operable to scan a light beam over the area. Each mirror is oscillated by an assembly controlled by a control circuit which produces controls signals which define the rate and frequency at which the mirrors are oscillated. More specifically, the mirror which sweeps the light beam between the vertical sides of the area is oscillated at a constant frequency, and the mirror which causes the mirror to progressively sweep between the top and bottom of the area is rotated so that a greater number of sweeps occur when the light beam progresses from the bottom to the top of the area than when the light beam progresses from the top to the bottom of the area. This reader configuration permits a fixed bar code reader having a predetermined scan rate during reading to accurately read bar codes passing through the scan area at increased speeds.

REFERENCES:
patent: 4387297 (1983-06-01), Swartz
patent: 5010242 (1991-04-01), Frontino
Allen-Bradley Company, Industrial Medium and High-Speed Bar Code Scanners, Publication 2755-2.34, May, 1990, pp. 1-12.

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