Optics: measuring and testing – Inspection of flaws or impurities – Having predetermined light transmission regions
Patent
1981-04-29
1983-07-26
Arnold, Bruce Y.
Optics: measuring and testing
Inspection of flaws or impurities
Having predetermined light transmission regions
250562, G01N 2189
Patent
active
043951228
ABSTRACT:
A flaw detection system optically detects defects on the surface of a grooved video disc surface. A beam of light incident on the surface being inspected is reflected thereby into a series of diffraction order cones. A cylindrical lens converges the higher diffraction order cones onto a split photodetector. When the light beam which scans the disc surface passes over a surface defect, such as a hillock, the reflected beam is deflected first to one photosensitive surface of the split photodetector and then to the other, thus providing an output from the photodetector to indicate the presence of such a defect.
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Gorog Istvan
Southgate Peter D.
Arnold Bruce Y.
RCA Corporation
Roehling J. E.
Tripoli J. S.
Whitacre E. M.
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