Apparatus for reading a bar code

Details Apparatus for reading a bar code Apparatus for reading a bar code

1990-03-29

1992-07-07

Levy, Stuart S.

Registers

Coded record sensors

Particular sensor structure

235463, 235494, G06K 710

Patent

active

051285274

ABSTRACT:
A second bar code such as an add-on code which comprises only a character bar and is added to the side of the first bar code such as UPC, EAN and JAN which has a center bar and guard bar can be correctly read out. When the scanning is made from the first bar code side to the second bar code side, a write address produced when the right guard bar of the first bar code is recognized is used to access the data of the second bar code. Conversely, where the scanning is made from the second bar code side to the first bar code side, the write address produced when the center bar of the first bar code is recognized is used to access the second bar code after an arithmetic operation. Therefore, the first bar code can be clearly distinguished from the second bar code which is different in bar code system and the second bar code can be correctly read out.

REFERENCES:
patent: 4056710 (1977-11-01), Shepardson et al.
patent: 4075461 (1978-02-01), Wu et al.
patent: 4272675 (1981-06-01), Blarford et al.
patent: 4354101 (1982-10-01), Hester et al.
patent: 4656345 (1987-04-01), Kurimoto
patent: 4717818 (1988-01-01), Broockman et al.

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