Nhk Spring Co., Ltd.

Nitto-denko Corporation

Tohru Ida

Hidekazu Hoshino

Itsuo Takeuchi

Tokio Sakauchi

Mutsumi Sasaki

Seiya Shibuya

Naomi Iida

Seiji Umemoto

Shinya Nasubida

Kazumasa Shibata

Kazuhito Kouno

Masatake Ono

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.

Identification medium

An identification medium, in which a pattern is clearly altered in observation through a right-handed circularly polarizing filter and observation through a left-handed circularly polarizing filter, is provided. The identification medium is formed by laminating a cholesteric liquid crystal layer, a &#x3bb;/4 plate, and a linearly polarizing filter layer, in that order, from an observing side. The cholesteric liquid crystal layer is formed with a hologram and selectively reflects light. In an observation through a circularly polarizing filter that transmits the light reflected at the cholesteric liquid crystal layer, light reflected at a pattern printed layer is not perceived due to the function of a circularly polarizing layer. Images are clearly altered by switching a right-handed and a left-handed circularly polarizing filter.

Identification medium and method for identification thereof

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, which can have much information, can be produced on a small scale at low cost, and enables change of a sticker design at low cost, is provided. The discrimination medium includes an optically transparent first substrate on which a cholesteric liquid crystal layer is formed, the cholesteric liquid crystal layer being formed with a fine asperity used for displaying a hologram, an optically transparent second substrate on which a print layer is formed, the print layer having a predetermined pattern made of ink and having a transparent portion without the ink of the pattern around the pattern, the pattern reflecting or absorbing a light of a predetermined wavelength, and a transparent adhesive layer, wherein the optically transparent first substrate, the optically transparent second substrate, and the transparent adhesive layer, are disposed in turn from a side checked visually.

Discrimination medium and production method therefor

A discrimination medium, which can have much information, can be produced on a small scale at low cost, and enables change of a sticker design at low cost, is provided. A cholesteric liquid crystal layer, having a fine asperity for forming a hologram, is formed on a transparent first substrate. A print layer composed of a black ink is formed on a transparent second substrate. The substrates are affixed to each other via a bond layer, so that a discrimination medium is obtained. In the discrimination medium, the display content obtained by the print layer is changed, so that the display content for discrimination can be changed at low cost.

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 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.

Identification medium, article, identification device, and method of identifying identification medium

A breakable seal can be discriminated more easily than the conventional one. The discrimination mediumhas a cholesteric liquid crystal layer, a substrate layer, an adhesive layer, and a partial peeling layer. The discrimination mediumhas an adhesion strength Xbetween the adhesive layerand the partial peeling layer, an adhesion strength Xbetween the partial peeling layerand the cholesteric liquid crystal layer, and an adhesion strength Xbetween the cholesteric liquid crystal layerand the substrate layer. The relationships X&#x3c;Xand X&#x3c;Xare satisfied at areas, and. The relationships X&#x3c;Xand X&#x3c;Xare satisfied at areasand. In the above manner, when the discrimination mediumis peeled from the article, the discrimination mediumis separated into a discrimination mediumand a discrimination medium. For example, the above cholesteric liquid crystal layer is provided to a breakable seal, so that the breakable seal which allows confirmation of whether or not the discrimination medium is authentic before the breakable seal is broken and which allows confirmation of breakage of he breakable seal when the breakable seal is broken is provided.

Growing community of inventors

Yokohama, Japan

Tohru Ida