System for reading coded indica with increased depth of field

Details System for reading coded indica with increased depth of field System for reading coded indica with increased depth of field

1995-05-09

1996-12-03

Shepperd, John

Registers

Coded record sensors

Particular sensor structure

235472, 250237R, G06K 710

Patent

active

055810683

ABSTRACT:
In a system for electro-optically reading coded indicia, such as bar code symbols, a light sensor in a scanning head generates higher amplitude electrical signals for symbols closer to the head, and lower amplitude electrical signals for symbols further from the head. To decrease this amplitude variation, and thereby increase the depth of the field of the system, various optical elements such as a lens, a louver, a filter and a shade, are proposed.

REFERENCES:
patent: 4019026 (1977-04-01), Nakanishi et al.
patent: 4387297 (1983-06-01), Swartz et al.
patent: 4409470 (1983-10-01), Shepard et al.
patent: 4673805 (1987-06-01), Shepard et al.

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