Optical bar code scanning device

Details Optical bar code scanning device Optical bar code scanning device

1975-08-07

1977-03-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

235 6111E, 250227, G06K 710

Patent

active

040138933

ABSTRACT:
An optical bar code scanning device for high data density bar code reading. The device utilizes a two channel arrangement for directing light reflected from the bar code being read onto two photodetectors in predetermined proportionate amounts. With a two channel system, it is possible to detect a bar edge independent of print contrast variations, resolution modulation or change of illumination by comparing the optical signal of one channel with the optical signal of the other. The bar edge is represented by the crossover point of the normalized outputs of the two channels.

REFERENCES:
patent: 2948817 (1960-08-01), Carpenter
patent: 3218909 (1965-11-01), Fain
patent: 3714432 (1973-01-01), Jalink, Jr.
patent: 3798458 (1974-03-01), Buckingham et al.
patent: 3906220 (1975-09-01), Delingat

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