Method of and apparatus for decoding bar code symbols

Details Method of and apparatus for decoding bar code symbols Method of and apparatus for decoding bar code symbols

1989-02-27

1991-05-14

Levy, Stuart S.

Registers

Coded record sensors

Particular sensor structure

235464, 235375, G06K 710

Patent

active

050158325

ABSTRACT:
A method and an apparatus scan a light beam (62) along an arcuate scan path (148 and 150) across a bar code symbol (48) to decode it. In a preferred embodiment, a robotic semiconductor wafer handler (10) rotates a fixed-beam optical scanning assembly (44) beneath the bar code symbol inscribed in and near the periphery of the bottom surface (50) of a stationary semiconductor wafer (12). The rotation of the optical scanning assembly is characterized as a series of angular positions. The bar code symbol is decoded by determining the angular position of each of the bars of the bar code symbol during the rotation of the optical scanning assembly. A microprocessor-based scan data processing system (60) included within the wafer handler carries out a decoding algorithm to determine the distances between adjacent bars, thereby to decode the bar code symbol.

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patent: 4825093 (1989-04-01), Kiriseko et al.

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