Registers – Coded record sensors – Particular sensor structure
Patent
1983-11-21
1986-04-29
Trafton, David L.
Registers
Coded record sensors
Particular sensor structure
235463, 369109, G06K 710
Patent
active
045859310
ABSTRACT:
A technique for automatically identifying a semiconductor wafer (30) having bar code identification indicia (32) on the front surface (31) thereof. Reading of the code is achieved by rotating the wafer about an axis (34) perpendicular to its front surface (31); directing a beam of radiant energy (37) at the code (32) along a predetermined direction relative to the front surface (31); and sensing, while rotating the wafer, the reflected radiant energy (39) within a second predetermined angular direction relative to the front surface. The bar code used herein is preferably a modified or "stretched" bar code 39 formed on the front surface of the wafer, and having an aspect ratio (i.e., dimension of a space/dimension of a bar) ranging from 1 to 4 (FIG. 2).
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"Code 39.RTM.-Alphanumeric Bar Code Specifications", published Jan., 1982, by Intermec Corporation.
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Duncan Hibbert A.
Ehret Francis J.
Kahn Sherwin R.
Kinney Karen H.
Parry Peter D.
AT&T - Technologies, Inc.
de Picciotto M. M.
Levy R. B.
Trafton David L.
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