Multilevel bar code reader

Details Multilevel bar code reader Multilevel bar code reader

1981-11-05

1984-04-17

Pitts, Harold I.

Registers

Coded record sensors

Particular sensor structure

235462, 235466, 235472, G06K 712

Patent

active

044436947

ABSTRACT:
A bar code reader is sensitive to at least three levels of darkness. At least three levels of darkness are utilized in the bar code so that, a higher density of data is thereby achieved. In the preferred embodiment, the bar code is encoded so that a transitional change from one level of darkness to another level of darkness is indicative of the data bits encoded. The bar code reader is passed over the multilevel bar code and through the use of a linear conversion such as by an analog to digital converter, the level of darkness of the bar is communicated to a decipher so as to be translated into a binary sequence.

REFERENCES:
patent: 3798421 (1974-03-01), Gilberg
patent: 4172554 (1979-10-01), Clarinval
patent: 4337375 (1982-06-01), Freeman

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