Optical disc measurement by refraction

Details Optical disc measurement by refraction Optical disc measurement by refraction

1981-11-23

1984-06-26

McGraw, Vincent P.

Optics: measuring and testing

Inspection of flaws or impurities

Transparent or translucent material

369 58, G01N 2188

Patent

active

044563752

ABSTRACT:
A method for measuring the size of dimple-type defects in an area of the surface of a flat piece of transparent material, such as an optical disc. A large beam of collimated light is provided and passed through the piece of material in a normal orientation with respect to the surface being inspected. A screen is placed in the path of the beam emerging from the disc and circular shadows generated by refraction are measured to determine the size of the defects which produces them.

REFERENCES:
patent: 3964830 (1976-06-01), Ikeda et al.
patent: 4153336 (1979-05-01), Minami et al.
patent: 4341469 (1982-07-01), Gardiner et al.

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