Optical disc cloud analyzer

Details Optical disc cloud analyzer Optical disc cloud analyzer

1996-07-24

1998-03-10

Font, Frank G.

Optics: measuring and testing

Inspection of flaws or impurities

Having predetermined light transmission regions

356430, G01N 2188

Patent

active

057267480

ABSTRACT:
An analyzer is employed for detecting a cloud in an optical disc having a transparent surface layer atop a substrate and data pits therebetween. A light beam is projected at an acute incidence angle atop the surface layer to define a light spot covering a plurality of the pits. Light scattered from the pits below the spot is detected obliquely to both the incident light beam and a specular reflection thereof. The light spot is scanned over the surface layer, and variation of detected light intensities over the disc is determined for detecting a cloud. In a preferred embodiment, the scattered light is detected from two different oblique directions to increase contrast of the cloud.

REFERENCES:
patent: 4464050 (1984-08-01), Kato et al.
patent: 4477890 (1984-10-01), Mooney et al.
patent: 4848864 (1989-07-01), Ostertag et al.
patent: 4954723 (1990-09-01), Takahashi et al.

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