Illumination system for OCR of indicia on a substrate

Details Illumination system for OCR of indicia on a substrate Illumination system for OCR of indicia on a substrate

1993-07-26

1995-11-21

McGraw, Vincent P.

Optical: systems and elements

Scale or indicia reading

359385, 356401, 250237R, C02B 2702

Patent

active

054692946

ABSTRACT:
An illumination system is provided having one or more light sources, opaque baffles, and mirrors for illuminating indicia on a substrate, such as a semiconductor wafer, for viewing by a camera aligned parallel with or at an angle to the substrate. The light sources include light emitting diodes (LEDs) for illuminating soft marks and broad spectrum incandescent lamps for illuminating hard marks. Dark field and light field illuminators are provided for enhanced reading of light indicia on a dark background and dark indicia on a light background, respectively. A light control unit allows for manual or automated control of light source selection and light intensity.

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Brochure entitled "IFS-1 Image Formation System" of Proofline, Inc., P.O. Box 36053, San Jose, Calif. 95158, 4 pages (undated but believed to have been published by 1989-1990).

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