Registers – Coded record sensors – Particular sensor structure
Patent
1993-05-06
1995-04-11
Hajec, Donald
Registers
Coded record sensors
Particular sensor structure
235467, G06K 710
Patent
active
054060605
ABSTRACT:
Apparatus for illuminating a bar code at a relatively shallow (i.e., acute) angle, and for sensing the light reflected from the surface at the shallow angle. In one embodiment the apparatus is used to illuminate the data bars at an acute angle along their length. Viewing the illuminated area at an acute angle, equal to the acute angle of incidence, increases the area being viewed and tends to spatially integrate the non-uniformity of the data bars. Apparatus embodying the invention is particularly useful for reading bar codes formed on a highly reflective surface. The shallow angle of illumination increases the contrast between the surrounding surface and the "data bars" of the bar code as it increases the effective area being viewed and enables the bar code to be read more accurately. In some embodiments a laser light spot is swept at an acute angle across a bar code and the light reflected from the bar code is viewed at the acute angle.
REFERENCES:
patent: 4034230 (1977-07-01), Brill
patent: 4538060 (1985-08-01), Sakai
patent: 4585931 (1986-04-01), Duncan
patent: 4818847 (1989-04-01), Hara
patent: 5010241 (1991-04-01), Butterworth
patent: 5149948 (1992-09-01), Chisholm
patent: 5166820 (1992-11-01), Fujita
Frech Karl D.
Hajec Donald
Opticon Inc.
Schanzer Henry
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