Bar code reader having a polygon mirror providing different scan

Details Bar code reader having a polygon mirror providing different scan Bar code reader having a polygon mirror providing different scan

1992-02-18

1993-06-29

Shepperd, John

Registers

Coded record sensors

Particular sensor structure

359217, G06K 710, G02B 2610

Patent

active

052237001

ABSTRACT:
A bar code reader reads a bar code by scanning a laser beam on a screen on which the bar code is displayed. The bar code reader has a beam scanning device for scanning the laser beam irradiated from a laser oscillator. The beam scanning device has a polygon mirror which is rotated and driven around an axis. The polygon mirror forms at least two kinds of flat reflecting surfaces for respectively scanning the laser beam along with the rotation of polygon mirror. Scanning angles by the reflecting surfaces are twice as large as opposite angles to which the reflecting surfaces correspond respectively. The laser beam is scanned at two or more kinds of scanning angles, that is, scanning angles and which are respectively adapted to the long and short bar codes. Therefore, the bar code can be accurately read irrespective of a length thereof.

REFERENCES:
patent: 4018504 (1977-03-01), Wu et al.
patent: 4043632 (1977-08-01), Jeffery et al.
patent: 4518218 (1985-05-01), Diepeveen
patent: 4938551 (1990-07-01), Matsumoto
patent: 4967074 (1990-10-01), von Stein

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