Code reading pattern and an image pickup apparatus for reading t

Details Code reading pattern and an image pickup apparatus for reading t Code reading pattern and an image pickup apparatus for reading t

1994-08-22

1996-01-02

Hajec, Donald T.

Registers

Coded record sensors

Particular sensor structure

235457, 235494, G06K 710

Patent

active

054810957

ABSTRACT:
A code reading pattern and an image pickup apparatus are provided for reading a symbol representing significant information, the symbol encoded by the pattern. The code reading pattern is formed by repeated markings of constant pitch on the surface of an object. The markings define area having at least one boundary, the at least one boundary defining an outline of the symbol. The apparatus includes a lighting system for illuminating the code reading pattern with parallel light, an imaging system for imaging light reflected from the pattern, a spatial frequency filtering system, located at the near back focal plane of the imaging system, for blocking regular reflected light and for transmiting diffracted light to project an image of the symbol, and a receiver for receiving the image.

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patent: 5251937 (1993-10-01), Ojster
patent: 5291006 (1994-03-01), Nishiguma et al.

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