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Counterfeiting prevention device having printing and birefringence pattern

An anti-counterfeiting device, birefringence technology, applied in printing, printing, printing of special varieties of printed matter, etc., can solve the problem of unknown birefringence pattern anti-counterfeiting device, etc., and achieve the effect of high latent image visibility and durability

Active Publication Date: 2012-03-28
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no anti-counterfeiting devices are known to date that are manufactured for the protection of the printed surface and durability and visibility of the birefringent pattern

Method used

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  • Counterfeiting prevention device having printing and birefringence pattern
  • Counterfeiting prevention device having printing and birefringence pattern
  • Counterfeiting prevention device having printing and birefringence pattern

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0139] [Preparation of patterned birefringent products]

[0140] A patterned birefringent product can be produced by at least sequentially patterning exposure and heating (baking) of a birefringent patterning material.

[0141] [patterned exposure]

[0142] In the description and / or claims of the present invention, the term "patterned exposure" refers to exposure performed in such a way that some areas of a birefringent pattern-making material are exposed or in two or more areas exposed differently. Exposure under conditions. In each exposure under different exposure conditions, no exposure (non-exposed area) may be included. The patterned exposure technique used may be contact exposure using a mask, proximity exposure, projection exposure, or the like. Scanning exposure can also be used, in which a laser, electron beam, etc. is focused at a predetermined position to directly draw an image without using a mask. Batch polishing may be used when the birefringence pattern pre...

Embodiment 1

[0213] The anti-counterfeiting device A was treated by a surface modifying device MEIR-5-600 (manufactured by MD Excimer Corporation). Then, letters and designs were letterpress-printed by using UV161 black (ink), red, cyan, yellow inks (manufactured by T&K Corporation). The anti-counterfeit device of Example 1 was obtained by performing dry lamination by using Sun-cut PL syn7LK (manufactured by LINTEC Corporation; front retardation: 5 nm; film thickness: 50 μm).

Embodiment 2

[0215] The anti-counterfeiting device of Example 2 was prepared in a manner similar to that of Example 1, except that anti-counterfeiting device B was used instead of anti-counterfeiting device A.

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PUM

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Abstract

The present invention provides a counterfeiting prevention device comprising a support, a patterned optically anisotropic layer having two or more regions of different birefringence, and a printed layer in this order, which further comprises a laminate film of retardation lower than 50 nm attached on said printed layer. The counterfeiting prevention device has high visibility of a latent image and durability.

Description

technical field [0001] The present invention relates to devices that are protected against counterfeiting by employing a birefringent pattern, said pattern being applied by printing. More specifically, the present invention relates to anti-counterfeiting devices with birefringent patterns and printed layers with their surfaces protected. Background technique [0002] In recent years, counterfeiting of luxury brands, cash receipts, gift certificates, credit cards, industrial parts, etc. has increased. Application of birefringent patterns to prevent counterfeiting has been proposed as a countermeasure against these counterfeit products (for example, see Japanese Unexamined Patent Publication (KOKAI) 2001-63300 and 2009-69793). The birefringent pattern is a latent image that is invisible under unpolarized light sources, making information such as images visible using polarizers. The method described in Japanese Unexamined Patent Publication (KOKAI) 2009-69793 can easily contr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09F3/02G09F3/10G07D7/0043G07D7/12G07D7/128
CPCB42D25/391B41M3/14B42D2033/04B42D2035/24G07D7/0006B42D15/0013B42D2035/42B42D25/29G07D7/003B42D25/364B42D25/36
Inventor 铃木聪美兼岩秀树
Owner FUJIFILM CORP