Anti-counterfeiting medium and method for fabricating anti-counterfeiting medium
AssigneeToppan Printing Co., Ltd.
InventorsMihoko OKAWA, Hideki OCHIAI, Koji ICHIKAWA, Yuki KOTEGAWA
Life of this patent
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Abstract
An anti-counterfeiting medium includes a recording medium, a polarizer layer arranged on a part of the recording medium. The polarizer layer is formed thereon with a low extinction-ratio area that forms an image portion where a polarizer exhibits an extinction ratio lower than in a portion other than the low extinction-ratio area of the polarizer layer. The recording medium is formed thereon with an image portion that is a part of the recording medium and has a nature different from that of a portion other than the part of the recording medium.
Claims10
An anti-counterfeiting medium comprising:
- a recording medium, with the recording medium having formed thereon an first image portion that is a part of the recording medium and has a nature different from another portion of the recording medium different from a portion of the first image portion;
- and
- a polarizer layer arranged on a part of the recording medium, with the polarizer layer having thereon a low extinction-ratio area that forms a second image portion where a polarizer exhibits an extinction ratio lower than another portion of the polarizer layer different from a portion of the second image portion.
An anti-counterfeiting medium comprising:
- a recording medium;
- a polarizer layer arranged on a part of the recording medium and configured to irreversibly vary an efficiency of changing light irradiated to the polarizer layer into polarized light, by means of a specific external stimulation;
- and
- an image continuously formed across the recording medium and the polarizer layer, wherein:
- the image includes a first portion formed in the recording medium and a second portion formed in the polarizer layer;
- the first portion has a color different from that of a portion where the first portion is not formed in the recording medium;
- and
- the second portion has a lower efficiency of changing the light irradiated to the polarizer layer into polarized light than in a portion where the second portion is not formed in the polarizer layer.
A method for fabricating an anti-counterfeiting medium, comprising:
- preparing a recording medium;
- arranging a polarizer layer on a part of the recording medium;
- and
- continuously forming an image across the polarizer layer and the recording medium by heating using either a laser engraving or a thermal head.
Dependencies are inferred from the claim text.