Patent classifications
B42D25/391
Viewer for determination of authenticity
An authenticity determination viewer including a first phase difference film, a linear polarizer, and a second phase difference film in this order, wherein a polarized light transmission axis of the linear polarizer and a slow axis of the first phase difference film are non-parallel to each other, and the polarized light transmission axis of the linear polarizer and a slow axis of the second phase difference film are non-parallel to each other.
METHOD FOR MANUFACTURING DISPLAY BODY, DISPLAY BODY, AND METHOD FOR VERIFYING AUTHENTICITY OF DISPLAY BODY
A display body includes a base material having a first region, a second region, and a third region. In the display body, the first region is formed with a code or an image of identification information, and the second region is formed with a hidden code containing information obtained by encoding at least a part of the identification information. An encrypted ciphertext is recorded in the third region, and the ciphertext is generated from at least one of the code of the identification information and the hidden code.
Laminate, verification, and method of producing laminate
A laminate includes a recording layer, a translucent front covering layer and a security foil laminated between the recording layer and the front covering layer and sealed in the laminate. The security foil has a thickness that is ⅕ or less the thickness of the recording layer to prevent or reduce falsification reusing the security foil. The security foil includes a relief layer having a relief surface and a protective layer covering the relief surface. In the thickness direction of the laminate, the protective layer adheres to the recording layer and the relief layer adheres to the front covering layer. The adhesion strength between the security foil and the recording layer is higher than the adhesion strength between the security foil and the front covering layer.
Laminate, verification, and method of producing laminate
A laminate includes a recording layer, a translucent front covering layer and a security foil laminated between the recording layer and the front covering layer and sealed in the laminate. The security foil has a thickness that is ⅕ or less the thickness of the recording layer to prevent or reduce falsification reusing the security foil. The security foil includes a relief layer having a relief surface and a protective layer covering the relief surface. In the thickness direction of the laminate, the protective layer adheres to the recording layer and the relief layer adheres to the front covering layer. The adhesion strength between the security foil and the recording layer is higher than the adhesion strength between the security foil and the front covering layer.
IDENTIFICATION MEDIUM, AUTHENTICITY DETERMINATION METHOD, AND ARTICLE
An identification medium includes a first layer, and a second layer disposed thereon in a manner of overlapping with the first layer. The first layer is capable of reflecting one of clockwise circular polarized light and counterclockwise circular polarized light and allowing to pass therethrough the remaining circular polarized light. The second layer is capable of reflecting at least a portion of circular polarized light having the same rotation direction as that of the circular polarized light that the first layer reflects, and allowing to pass therethrough circular polarized light having an opposite rotation direction to that of the circular polarized light reflected by the first layer. A ratio (Ssf.sub.2/S.sub.2) of Ssf.sub.2 defined by the following formula (2) relative to S.sub.2 defined by the following formula (1) is more than 0.7:
IDENTIFICATION MEDIUM, AUTHENTICITY DETERMINATION METHOD, AND ARTICLE
An identification medium includes a first layer, and a second layer disposed thereon in a manner of overlapping with the first layer. The first layer is capable of reflecting one of clockwise circular polarized light and counterclockwise circular polarized light and allowing to pass therethrough the remaining circular polarized light. The second layer is capable of reflecting at least a portion of circular polarized light having the same rotation direction as that of the circular polarized light that the first layer reflects, and allowing to pass therethrough circular polarized light having an opposite rotation direction to that of the circular polarized light reflected by the first layer. A ratio (Ssf.sub.2/S.sub.2) of Ssf.sub.2 defined by the following formula (2) relative to S.sub.2 defined by the following formula (1) is more than 0.7:
Encrypted optical security device
The invention relates to an optical security system comprising an optical element with a patterned anisotropic optical property, wherein information is encoded and encrypted in the pattern of the optical element. The system further comprises a patterned polarizer in which the pattern is such that the information stored in the optical element can be decrypted.
Encrypted optical security device
The invention relates to an optical security system comprising an optical element with a patterned anisotropic optical property, wherein information is encoded and encrypted in the pattern of the optical element. The system further comprises a patterned polarizer in which the pattern is such that the information stored in the optical element can be decrypted.
IDENTIFICATION MEDIUM, AND METHOD FOR DETERMINING AUTHENTICITY OF IDENTIFICATION MEDIUM
An identification medium comprising a first resin layer and a second resin layer in this order from a viewing side, wherein the first resin layer contains a first cholesteric liquid crystal resin that is a cured product of a first liquid crystal composition, and the first cholesteric liquid crystal resin selectively reflects light at a wavelength of 700 nm or longer and 900 nm or shorter, the second resin layer contains a second cholesteric liquid crystal resin that is a cured product of a second liquid crystal composition, and the second cholesteric liquid crystal resin selectively reflects light at a wavelength of 400 nm or longer and 500 nm or shorter, and the first resin layer has an average value of light transmittance at a wavelength of 400 nm or longer and 425 nm or shorter of 50% or more and 90% or less.
IDENTIFICATION MEDIUM, AND METHOD FOR DETERMINING AUTHENTICITY OF IDENTIFICATION MEDIUM
An identification medium comprising a first resin layer and a second resin layer in this order from a viewing side, wherein the first resin layer contains a first cholesteric liquid crystal resin that is a cured product of a first liquid crystal composition, and the first cholesteric liquid crystal resin selectively reflects light at a wavelength of 700 nm or longer and 900 nm or shorter, the second resin layer contains a second cholesteric liquid crystal resin that is a cured product of a second liquid crystal composition, and the second cholesteric liquid crystal resin selectively reflects light at a wavelength of 400 nm or longer and 500 nm or shorter, and the first resin layer has an average value of light transmittance at a wavelength of 400 nm or longer and 425 nm or shorter of 50% or more and 90% or less.