Light arrangement for vision system including a light...

Details Light arrangement for vision system including a light... Light arrangement for vision system including a light...

2005-09-13

2005-09-13

Le, Que T. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

C250S2140AL

Reexamination Certificate

active

06943333

ABSTRACT:
A lighting arrangement for use in vision systems and imaging applications. The arrangement illuminates the object to be imaged with a supplied light of a specified illumination. The intensity, hue, and directionality of the supplied light can be varied. The desired illumination is specified either by manually operable controls or via a programming interface. The arrangement has a light source which includes light-emitting diodes mounted in a housing. The source provides a constant light output over a long lifetime. A light sensor senses the total illumination on the object being imaged resulting from ambient light in addition to the supplied light, and a negative feedback circuit in the arrangement can adjust the level of the supplied light in response so as to maintain a constant total illumination on the object despite variations in the ambient lighting.

REFERENCES:
patent: 3609451 (1971-09-01), Edgerly et al.
patent: 5134277 (1992-07-01), Yerbury et al.

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