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Apparatus and method for inspection of surface quality of smooth surfaces

  • US 5,090,804 A
  • Filed: 01/29/1990
  • Issued: 02/25/1992
  • Est. Priority Date: 07/30/1987
  • Status: Expired due to Term
First Claim
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1. An apparatus for inspecting the surface quality of objects having smooth surfaces for defects, where the type of surfaces range from highly reflective to lowly reflective, said apparatus comprising a light source and diffusing surface, the light source and diffusing surface being contained in an opaque enclosure, said enclosure having an aperture through which some of the light can escape, the light source and diffusing surface being arranged to produce a gradient of light through the aperture, the diffusing surface being located some distance behind the aperture and the light emitted from the aperture being directed in the form of a beam, with means for supporting a particular object to be inspected at a low angle in said beam so that said object reflects said beam away from said enclosures, while controlling any extraneous light, with means to observe the reflected beam, the gradient in the reflected beam exposing any defects on the surface of said object that are located in said beam of light so that the location of said defects can be noted.

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