Optical scanner

Details Optical scanner Optical scanner

1994-09-08

1996-05-14

Hajec, Donald T.

Registers

Coded record sensors

Particular sensor structure

235454, G06K 710

Patent

active

055170129

ABSTRACT:
A circuit that prevents optical screening systems from being pinned in an inoperative state under certain light conditions. The invention accomplishes this by using a circuit comprising a photodetector for converting scattered light from a visual code (e.g., universal product code) into current and a current limiting circuit coupled to the photodetector for limiting the current capable of passing through the photodetector.

REFERENCES:
patent: 5099118 (1992-03-01), Francis
patent: 5214527 (1993-05-01), Chang et al.
patent: 5229588 (1993-07-01), Detwiler et al.
patent: 5329115 (1994-07-01), Lim
P. Horowitz, The Art Of Electronics, Cambridge University Press, NY, Jan. 1989, pp. 88-89.

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