Apparatus for viewing printed circuit boards having specular non-planar topography
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United States of America Patent
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Apr 5, 1988
Grant Date -
N/A
app pub date -
Jul 1, 1983
filing date -
Jul 1, 1983
priority date (Note) -
Expired
status (Latency Note)
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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.
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