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Method for production of and distinction between combined validification and identification photographs

  • US 3,961,956 A
  • Filed: 05/15/1975
  • Issued: 06/08/1976
  • Est. Priority Date: 09/26/1972
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of making an identification image in the form of a compositive photograph containing at least two different images, one of which is a holder image and the other of which is a check image, with the holder image not being clearly discernible when viewed normally because the check image dominates the view, which method comprises:

  • projecting a first holder image on a sheet of photosensitive material through a first board formed of a plurality of slats disposed parallel to one another at an even pitch and separated by gaps, said gaps being less wide than the slats and being no greater than 45 mm in width, with said slats being approximately at least twice as wide as the width of said gap, with said board being positioned in close contact with said photosensitive sheet, whereby, only said photosensitive sheet portions defined by said gaps of said first board are initially exposed, andprojecting a second check image on said photosensitive sheet through a second board, which is positioned in close contact with said photosensitive sheet, with said second board slats being at least as wide as said gaps of said first board and lying over the previously exposed portions of said photosensitive sheet and having gaps between said second board slats which are at least twice as wide as the gaps of said first board and being aligned with unexposed portions thereof, whereby, only said photosensitive sheet portions defined by said gaps between said second board slats are exposed to form a compositive photograph containing said first and second images, said first image being contained in thin striate portions corresponding to said photosensitive sheet portions exposed through gaps between said first positioned board slats, and said second image being contained in thin, straite portions corresponding to said photosensitive sheet portions exposed through said gaps between said second positioned board slats, whereby, said second image is readily viewable and dominates said view, and said first image becomes apparent and dominates said view only when viewed through a lenticular lens having plano-convex portions disposed at the same pitch as said slats of said first board when placed in close contact with said composite photograph and moved into a position in which said lens plano-convex portions are aligned with respective striate portions containing said first image.

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