Contrast measurement system for laser marks

Details Contrast measurement system for laser marks Contrast measurement system for laser marks

1998-02-20

1999-10-19

Font, Frank G.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250572, G06K 710, G01N 1506

Patent

active

059693746

ABSTRACT:
This invention relates to a technique of contrast measurement especially useful for the measurement of contrast of laser mark. The technique involves measuring the light intensity coming from a laser mark and the intensity coming from a background on the integrated circuit, calculating the contrast based on the intensities, and comparing to a gray scale. This invention enables contrast to be measured and communicated with respect to a set of references and hence eliminates subjective judgement.

REFERENCES:
patent: 4339745 (1982-07-01), Barber et al.
patent: 4972093 (1990-11-01), Cochran et al.
patent: 5585616 (1996-12-01), Roxby et al.

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