Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-04-07
1989-11-21
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250223B, G01N 2186, G01N 904
Patent
active
048824984
ABSTRACT:
An engineered lighting system for use in an inspection system is comprised of an array of light emitting diodes. A specimen is brought into the viewing area, and a current pulse is provided to the diodes of the array to selectively flash all or a portion of the diodes of the array. Reflected light from the specimen is sensed and a digitized image is generated therefrom. An illumination level of the digitized image is adjustable, in whole or in part, by varying the effective lighting intensity of one or more of the diodes of the array during a flash period. The digitized image of the specimen is compared to data indicative of acceptability of the specimen, and acceptance or rejection of the specimen is decided on a basis of a comparison therebetween.
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Austin James R.
Cochran Don W.
Nelms David C.
Oen William L.
Pressco Inc.
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