Nhk Spring Co., Ltd.

Nippon Oil Corporation

Other

Nitto-denko Corporation

Nippon Mitsubishi Oil Corporation

Rp Topla Limited

Dai Nippon Printing Co., Ltd.

Itsuo Takeuchi

Hidekazu Hoshino

Tokio Sakauchi

Tohru Ida

Seiya Shibuya

Tatsuya Kurihara

Masumi Yoda

Mutsumi Sasaki

Suzushi Nishimura

Minoru Komiya

Shinya Nasubida

Tsugutaka Sugahara

Gorou Suzaki

Tooru Ida

Seiji Umemoto

Hiroyuki Matsumoto

Hajime Arai

Shinichiro Suzuki

Tsukasa Higashi

Tomoyoshi Sakamoto

Kazumasa Shibata

Masahiro Arai

Shinei Suzuki

Rie Maejima

Susumu Oaku

Masatake Ono

Akihito Shiozawa

Masumi Yokoyama

Mikihiko Sakakibara

Mutumi Sasaki

Kazuhito Kouno

Mikihiko Dai Nippon Printing Co Ltd Sakakibara

Shinichiro Central Techn Res Lab Suzuki

Suzushi Central Techn Res Lab Nishimura

Akihito Central Techn Res Lab Shiozawa

An identification medium can be used in an opening label, clearly show signs of it having been opened, and also have a superior authenticity-confirming function. The identification medium has a structure including, in the following order as seen from the side of observation: an optical function layer that generates a color shift, a separation layer that is partially formed, a printed layer, and an adhesive layer, in which when an adhesive strength between the adhesive layer and an adherend is set to be Xa, an adhesive strength between the adhesive layer and the printed layer is set to be Xb, and an adhesive strength at a portion in which the separation layer is laminated between the optical function layer and the printed layer is set to be Xc, the adhesive strength of each part is set to satisfy Xa&#x3e;Xb&#x3e;Xc or Xb&#x3e;Xa&#x3e;Xc.

Identification medium

An identification medium can be affixed to cloth or leather products by sewing. A cholesteric liquid crystal layer on which an embossed surface for forming a hologram is formed, is sandwiched between a first supporting member and a second supporting member. A mounting region that can be affixed to clothing, etc., by sewing, is formed.

In an identification medium, switching of images can be clearly observed, and the medium has a structure produced at low cost. The structure comprises a cholesteric liquid crystal layerin which a hologram is formed, and which selectively reflects circularly polarized light of a specific rotating direction of a specific central wavelength, a cholesteric liquid crystal layer reflecting the entire range of visible lightwhich has reflection characteristics equivalent to a case of reflecting the entire range of visible light and which reflects circularly polarized light of the same rotating direction as the circularly polarized light reflected from the cholesteric liquid crystal layer, and a display patternhaving a specific content displayed, arranged in this order, as seen from the side of observation.

An identification medium is provided in which latent image having plural colors can be observed even when the identification medium is spaced away from a polarization filter. A cholesteric liquid crystal layer is provided as a specific polarization light reflection layer which reflects light having a specific polarized condition. An optical anisotropic layer having an optical anisotropy is provided at an upper position overlapping with the specific polarization light reflection layer. An image A fanned by an area having an optical anisotropy different from that of surroundings is formed at the optical anisotropic layer. When the identification medium is directly viewed, the influence of the optical anisotropy cannot be seen. When the identification medium is observed via a circular polarization filter, the image can be seen to have a specific color by the influence of the optical anisotropy.

Identification medium and identification method therefor

A technique detects counterfeit products having appearances similar to authentic products with high accuracy. A cholesteric liquid crystal layer in which hologram is processed and circularly polarized light of primary rotating direction having specific central wavelength can be selectively reflected and a code forming layer in which code printed pattern that is an objective of reading is formed, are arranged in this order seen from a side from which reading is performed. The hologram image that inhibits reading of information of the code while an optical reading device reads it together with the code, and it is formed by the hologram processing.

Identification medium, method for reading data therefrom, apparatus for identification, and method and apparatus for production thereof

A discrimination medium on which printing can be freely performed, which cannot be easily falsified, in which the authenticity can be easily discriminated by unique appearance, and which can be produced at low cost, is provided. A cholesteric liquid crystal layer, and a breakable print recording layer are laminated in the discrimination medium. The cholesteric liquid crystal layerhas plural light transparent films, which are laminated and are different from each other in refraction index. Therefore, the discrimination medium has unique optical characteristics such that a character, a symbol, a pattern, a figure formed by printing by a thermal printer or the like changes in color depending on the viewing angle. A discrimination method using the above optical characteristics of the discrimination medium is provided.

Discrimination medium and discrimination method for discriminating the same

An identification medium is to be observed via a linearly polarizing filter and includes a first liquid crystal layer that changes the wavelength of light according to the rotational angle of the linearly polarizing filter, a cholesteric liquid crystal layer, and a light absorbing layer that is provided below the cholesteric liquid crystal layer.

Identification medium, identification method, and identification apparatus

Provided is a multilayer reflector about which a complicated step is not required when the molecular alignment of a retardation film is partially relaxed to form a latent image of authentication information, and about which the latent image is not made visible by the generation of unevenness in the surface. A multilayer reflectorhas a retardation filmin which the phase difference &#x394;ndto an observation wavelength &#x3bb; is set to be m&#xd7;&#x3bb;/4&#x2212;&#x3bb;/16&#x2266;&#x394;nd&#x2266;m&#xd7;&#x3bb;/4+&#x3bb;/16 wherein m is a positive odd number, and a metallic reflectorlaminated on the rear face side of this retardation filmwherein an authentication regionwhere predetermined authentication information is beforehand formed in the retardation filmis formed to give a phase difference &#x394;ndset to be n&#xd7;&#x3bb;/4&#x2212;&#x3bb;/8 &#x2266;&#x394;nd&#x2266;n&#xd7;&#x3bb;/4+&#x3bb;/8 wherein n is 0 or a positive even number provided that n&#x3c;m, and further a light diffusing layeris formed on the front face side of the retardation film

Multilayer reflector, authentication card, bar code label, authentication system, and authentication region forming system

An object of the present invention is to provide a discrimination medium which has high discrimination ability, and which is more difficult to counterfeit than conventional discrimination mediums. A discrimination medium comprises: a cholesteric liquid crystal layer; and a liquid crystal layer acting as a half-wave plate and provided on the cholesteric liquid crystal layer in a predetermined pattern.

Discrimination medium comprising a liquid crystal layer acting as a half-wave plate wherein a gradation of gradual or continuous color changes are displayed according to an area

A transparent plastic container which is transparent, allows good design and can be used for an anticounterfeit system that determines authenticity by visual check with the use of polarization property. A transparent plastic sheet of a polystyrene-based resin having a total light transmission of 85% or higher and a haze of 7% or less is subjected to vacuum, pneumatic or vacuum/pneumatic forming at a sheet temperature ranging from a glass transition temperature plus 50 degrees C. to a glass transition temperature plus 130 degrees C., thereby obtaining a transparent plastic container having a planar portion with a strain amount of 150 nm or less.

Transparent plastic container for anticounterfeit system

An identifying medium comprises a nematic liquid crystal layer for forming a latent image with gradation, and the nematic liquid crystal layer has a thickness distribution corresponding to the gradation.

Identifying medium, identifying medium manufacturing method, article, and identifying medium identifying method

An identification medium provided with a laminated structure comprises laminated layers of a magnetically controllable layer, in which magnetic microcapsules are dispersed, and a color shifting layer.

A discrimination medium cannot be easily falsified. Since the visibility of the discrimination medium is unique, the discrimination medium is superior in determination of the authenticity. The discrimination medium is structured such that a cholesteric liquid crystal layerand a multilayer filmhaving plural light transparent films which are laminated and are different from each other in refraction index are laminated. The reflection light reflected by the discrimination medium includes circular polarization lights which are different in polarization direction, and the discrimination medium has unique optical characteristics. A discrimination method using the above unique optical characteristics, an article to be discriminated by the discrimination medium, and a discrimination apparatus using the above unique optical characteristics are provided.

Discrimination medium, discrimination method, article to be discriminated, and discrimination apparatus

A thermosensitive ink layeris composed of a thermochromic material which changes from black to a transparent state and is formed on a substratemade from a PET film by heating. A cholesteric liquid crystal layeron which a hologramof an appropriate form is formed on the cholesteric liquid crystal layer is mounted thereon. At ordinary temperature, the thermosensitive ink layerexhibits a property of light absorption and a property of selective reflection and a color shifting of the cholesteric liquid crystal layerare observed. The thermosensitive ink layerbecomes transparent by heating and the figureon the substrateis also visible. The determination of the authenticity thereof is performed by utilizing the change of view. Therefore, the anticounterfeiting effects are superior to those of the discrimination techniques using conventional techniques, and this enables articles to be distinguished easily and reliably.

Discrimination medium and discrimination method therefor

An identifying medium comprises an optical functional layer that is optically identifiable and comprises a layer containing microcapsules. The microcapsule contains a material that occurs color change by breaking the microcapsule.

Growing community of inventors

Yokohama, Japan

Itsuo Takeuchi