Robust, LED illumination system for OCR of indicia on a substrat

Details Robust, LED illumination system for OCR of indicia on a substrat Robust, LED illumination system for OCR of indicia on a substrat

1992-05-01

1993-07-27

Ben, Loha

Optical: systems and elements

Scale or indicia reading

359385, 356401, 250237R, G02B 2702

Patent

active

052315363

ABSTRACT:
Double banks of LED's, opaque baffles, and a camera having a field of view are disclosed for reading laser-etched character strings and other indicia on semiconductor wafers and other substrates. The LED's of the banks may be integrally or separably lensed, and masks may be provided proximate the banks and in the nearfield of the LED's.

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