Apparatus for viewing printed circuit boards having specular non

Details Apparatus for viewing printed circuit boards having specular non Apparatus for viewing printed circuit boards having specular non

1983-07-01

1988-04-05

Corbin, John K.

350601, G02B 2106, G02B 508

Patent

active

047354976

ABSTRACT:
An isotropic light source produces uniform illumination of a generally planar objects to be visually inspected by a microscope such as a P.C. board having an irregular specular surface. Detrimental dark spots which are normally produced are eliminated by providing a skewed beamsplitter between the microscope and the viewed surface, which beamsplitter redirects light directly at the object along or near the optical viewing axis. The isotropic light source is a light integrating cavity in a first embodiment and a pair of fluorescent lamps in a second embodiment.

REFERENCES:
patent: 3604783 (1971-09-01), Roth
patent: 3941467 (1976-03-01), Kopany et al.
patent: 4402604 (1983-09-01), Nash

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