Reticle bar code and method and apparatus for reading same

Details Reticle bar code and method and apparatus for reading same Reticle bar code and method and apparatus for reading same

1983-05-23

1986-01-28

Trafton, David L.

Registers

Coded record sensors

Particular sensor structure

235385, 235463, G06K 710

Patent

active

045673616

ABSTRACT:
In the reticle bar code scheme disclosed herein, the peculiar characteristics and requirements of a microlithographic reticle are utilized in a bar code scheme which provides multiple levels of error checking while permitting an extensive repertoire of reticle identifying characters. In reading the bar code, the reticle is moved passed a photoelectric sensor and, by counting a clock signal, the width of each bar is measured. A synchronization character at the start of the data character string provides a nominal bar width value and each character comprises three bars of each polarity, the bars being integral multiples of the nominal value with the width of the character being ten times the nominal value.

REFERENCES:
patent: 3987278 (1976-10-01), Van Elzakker et al.
patent: 4059224 (1977-11-01), Seligman
"Bar Code Symbology"; David C. Allais; Intermec; Feb. 16, 1982, 42 pages.

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