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Method for producing laser hologram anti-counterfeit mark with identifying card and inspecting card and inspecting apparatus for the mark

  • US 6,001,510 A
  • Filed: 02/13/1997
  • Issued: 12/14/1999
  • Est. Priority Date: 08/15/1994
  • Status: Expired due to Fees
First Claim
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1. A method for producing laser hologram anti-counterfeit mark composed of identifying card and inspecting card, said method comprising the steps of:

  • coding predetermined or randomly-produced image originals to provide coded image originals, and converting the coded image originals into information in a frequency domain;

    dividing arbitrarily a frequency spectrum plane converted from the coded image originals into two parts and using them as double-card master masks;

    using an optic method or a CGH (computer-generated hologram) method to transform at least one of the double-card master masks to a first photoresist plate;

    using the optic method or the CGH method to transform the other one of the double-card master masks to a second photoresist plate;

    making the identifying card and the inspecting card by one of developing, electroforming, and die pressing above said first and second photoresist plates separately onto an identifying card substrate and an inspecting card substrate.

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