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Image scanning apparatus and method

  • US 5,528,359 A
  • Filed: 07/25/1994
  • Issued: 06/18/1996
  • Est. Priority Date: 07/30/1993
  • Status: Expired due to Fees
First Claim
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1. An image scanning method for automatically inspecting a product having light transmission regions, comprising the steps of:

  • disposing a light source on one side of said product, while disposing an optical sensor on the other side of said product;

    sequentially varying the incidence angle of a light output emitted from said light source and caused to be incident upon a plurality of the light transmission regions of said product simultaneously at each angle;

    receiving, by said optical sensor, the light transmitted through the light transmission regions of said product at each of the varied incidence angles, thereby acquiring image data at each of said incidence angles with regard to said product;

    obtaining a composite image data from the image data acquired at each of said incidence angles;

    differentiating light distribution intensities in said composite image data to recognize the edges of the light transmission regions; and

    detecting any defect of said product on the basis of an examination of said edges of the light transmission regions.

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