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Latent image forming film, latent image identifying kit and method of latent image identification

A latent image and orientation technology, applied in optical elements, polarizing elements, printing, etc., can solve the problems of difficulty in mass production for the implementer, the inability to identify the authenticity of the medium and the popularization and application, and achieve the effect of being difficult to counterfeit.

Inactive Publication Date: 2009-09-16
NIPPON OIL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although these liquid crystal films are difficult to forge, it is also difficult for implementers to mass produce them, so they cannot be widely used as authenticity identification media

Method used

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  • Latent image forming film, latent image identifying kit and method of latent image identification
  • Latent image forming film, latent image identifying kit and method of latent image identification
  • Latent image forming film, latent image identifying kit and method of latent image identification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Using aluminum foil as a reflective layer (manufactured by SUMIKEI ALUMINUM FOIL Co., Ltd., product name "my foil"), using a twisted nematic liquid crystal film (manufactured by Nippon Oil Corporation, "NISSEKILC film" series, optical retardation at a wavelength of 590 nm: 500 nm , Twist angle: 240°) As a polarization conversion rotation layer, a twisted nematic liquid crystal film is laminated on an aluminum foil to produce a latent image forming film of the present invention.

[0056] That is, on the surface of the liquid crystal layer on which the twisted nematic liquid crystal film was formed, a transparent adhesive was pasted at a speed of 0.7 cm / minute using a film applicator so that air bubbles did not enter. Next, the protective film of the transparent adhesive was peeled off, and a rectangular aluminum foil cut into approximately 20 cm x 30 cm was attached without creases at a speed of 0.7 cm / min using a film gluing machine to obtain the latent image forming fil...

Embodiment 2

[0060] The latent image forming film of the present invention was prepared in the same manner as in Example 1 except that a commercially available decorative hologram film was used instead of the aluminum foil as the reflective layer.

[0061] Then, when the obtained latent image-forming film was observed with the naked eye, although patterns corresponding to colors other than the silver background color of the holographic image were observed due to the interference of the holographic image, no latent image light was observed. Next, the discriminator obtained by the same method as in Example 1 was placed on the latent image forming film in a closely adhered form, and a plurality of latent image lights that could be observed were observed through the discriminator. As a result, in addition to observing Beyond the pattern of the holographic image, a vibrant combination of green, blue, and red colors was observed. Therefore, it can be proved that according to the latent image ide...

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Abstract

The present invention provides a latent image forming film comprising: a reflective layer; and a polarization converting and rotating layer placed on a surface of the reflective layer, the polarization converting and rotating layer changing an ellipticity of polarized incident light and concurrently rotating a polarization direction of the polarized incident light.

Description

technical field [0001] The present invention relates to a latent image forming film, a latent image identification kit, and a latent image identification method, and more specifically, relates to an application for preventing counterfeiting of cards, commodity coupons, exchange coupons, stamps, banknotes, passports, ID cards, securities, public A latent image forming film useful as an authenticity identification medium of an object such as a lottery ticket, a latent image identification kit, and a latent image identification method. Background technique [0002] Conventionally, as a method of preventing the forgery of credit cards, certificates, and exchange notes, it is known that an authenticity identification medium that is difficult to forge is pasted on an object to be prevented from forgery, and its authenticity is judged visually or mechanically. . As such authenticity identification media, holograms and liquid crystal films are being developed. [0003] The technol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30B42D15/10G02F1/13G07D7/12
CPCG02B5/3083B42D25/328G02B5/30G02F1/13
Inventor 西村凉须崎吾郎
Owner NIPPON OIL CO LTD