Registers – Coded record sensors – Particular sensor structure
Patent
1993-02-22
1996-09-03
Pitts, Harold
Registers
Coded record sensors
Particular sensor structure
235470, G06K 710
Patent
active
055525911
ABSTRACT:
A single width bar code exhibiting inherent self clocking characteristics is provided so as to be particularly useful in the identification of semiconductor wafers in very large scale integrated circuit manufacturing processes. The codes described herein are robust, reliable and highly readable even in the face of relatively high variations in scanning speed. The codes are also desirably dense in terms of character representations per linear centimeter, an important consideration in semiconductor manufacturing wherein space on the chips and the wafer is at a premium. Additionally, a preferred embodiment of the present invention exhibits a minimum number for the maximum number of spaces between adjacent bars in code symbol sequences.
REFERENCES:
patent: 4680457 (1987-07-01), Robertson
patent: 4833306 (1989-05-01), Milbrett
Bossen Douglas C.
Chen Chin-Long
Dill Frederick H.
Goodman Douglas S.
Hsiao Mu-Yue
Cutter Lawrence D.
International Business Machines - Corporation
Pitts Harold
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