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Method and device for detecting patterns on a substrate

  • US 7,242,463 B2
  • Filed: 04/28/2005
  • Issued: 07/10/2007
  • Est. Priority Date: 05/05/2004
  • Status: Expired due to Fees
First Claim
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1. A device for detecting patterns on a travelling substrate travelling in a travel direction, comprising:

  • a housing;

    a first source of light issuing a first incidental beam toward the substrate;

    a second source of light issuing a second incidental beam toward the substrate;

    an optical measuring system, a photosensitive sensor respectively collecting reflected beams from the substrate wherein the optical measuring system is telecentric, the first incidental beam crosses a telecentric lighting system and the second incidental beam crosses an oblique lighting system; and

    an electronic unit connected to the sensor and connected to a communication port.

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