Laser scanner projection system for viewing features on substrat

Details Laser scanner projection system for viewing features on substrat Laser scanner projection system for viewing features on substrat

1998-11-25

2000-12-12

Pham, Hoa Q.

Optics: measuring and testing

By monitoring of webs or thread

For flaws or imperfections

356431, 25055906, G01N 2132

Patent

active

061606251

ABSTRACT:
An inspection system for viewing substrate or coated substrate features, wherein a directed light source is projected through a coated substrate onto a viewing surface such that features or irregularities in the substrate or in the coating of the coated substrate are displayed. The inspection system includes a projection system including a light source positioned adjacent the second major surface of the optically transmissive substrate, and a viewing screen positioned adjacent the first major surface of the substrate. The substrate is positioned in optical alignment along an optical path between the light source and the viewing screen such that irregularities in the coated top surface of the substrate can be visually observed on the viewing screen by a user. In one aspect the substrate is coated. Optionally, the directed light source is a laser scanner assembly.

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"Modern Coating and Drying Technology" Editors Edward Cohen and Edgar B. Gutoff,Published by VCH Publishers, Inc. (1992) pp. v-310.

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