Automatic focusing system of an observing means for...

Details Automatic focusing system of an observing means for... Automatic focusing system of an observing means for...

H - Electricity

05

K

356/2, 350/32

H05K 13/08 (2006.01) H04N 5/232 (2006.01)

Patent

CA 1275330

ABSTRACT Focussing of a TV camera for visually inspecting an object is executed while the object is being removed to line up the TV camera with the next inspecting point on the object by using a cal- culated distance from the TV camera to the next inspecting point without measuring the actual distance. The distance to the next inspecting point is calculated from a plane equation of one of several triangular planes formed over the object by connecting reference points previously designated on the object. The plane equations are calculated before executing the inspection, by using distances, actually measured by a distance measuring means, from the TV camera to the reference points. The invention reduces the time necessary to inspect the object which is important in the case of large printed wiring boards.

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