Toppan Printing Co., Ltd.

Kazuhiro Yashiki

Akira Kubo

Chikara Sawamura

Satoshi Harada

Naoki Minamikawa

Keitaro Sugihara

Tomoko Tashiro

Akihito Kagotani

Akira Nagano

Hidetaka Ide

Hanako Yamamoto

Haruna Ooki

Koji Umezaki

Naoaki Shindou

Noriyuki Itou

A display having high resistance to counterfeiting including a micro concavo-convex structure layer on a predetermined reference surface, the micro concavo-convex structure layer having a plurality of microstructures arranged on the reference surface. Each of the microstructures is formed of a prism structure made of a material that transmits light with a triangular cross-section having a first surface inclined relative to the reference surface in side view, and a second surface having an inclination angle relative to the reference surface such that the inclination angle is larger than an inclination angle of the first surface relative to the reference surface. A color layer as an example of a functional layer is provided on the second surface of all or some of the plurality of microstructures.

Display and method of producing display

Provided are a highly versatile counterfeit-preventive optical element applicable to both the banknote field and the ID field and an information medium including the optical element. A counterfeit-preventive optical element () of an embodiment includes a first layer (), second layer (), and a third layer () that are stacked in this order. A relief structure (R) is provided between the first layer () and the second layer (), the first layer () includes a first region () and a second region (), the first region () totally reflects incident light incident from the first layer () due to at least one of the angle of a face of the relief structure (R) and the refractive index ratio of the first layer () and the second layer (), and the second region () transmits or refracts at least some of incident light incident from the first layer () due to one of the angle of a face of the relief structure (R) and the refractive index ratio of the first layer () and the second layer (). The transparency of the second region () is higher than the transparency of the first region () only when the optical element is observed from the first layer () at a particular angle.

Counterfeit-preventive optical element and information medium

There is provided an optical structure having a quantization phase difference structure on one surface of a quantization phase difference structure layer, wherein in the quantization phase difference structure, a plurality of quantization projecting portions in a constant size and a plurality of quantization recessed portions in a constant size are aligned, wherein a multiple diffraction region has the quantization phase difference structure where ribbed projecting portions, in which the quantization projecting portions are aligned in one direction, are arranged adjacent to and alternately with groove-like recessed portions, in which the quantization recessed portions are aligned parallel to the ribbed projecting portions, and wherein the multiple diffraction region is a quantization phase difference structure configured to reproduce a plurality of reproduction points discrete in one direction and arranged regularly.

Optical structure and authentication body

There is provided an optical element for counterfeit prevention that has both high counterfeit preventing property and designability by a multi-optical element structure. The optical element has a second layer () having a relief structure on a front surface, a first layer () disposed on the second layer (), and a third layer () in a thin film interposed between the second layer () and the first layer () and formed along a front surface of the relief structure. The second layer () has a refractive index lower than a refractive index of the first layer () and the third layer () has a refractive index higher than the refractive index of the first layer (). The optical element has at least a first region () and a second region () in a plan view. In the first region (), an electromagnetic wave that enters from a side of the first layer () in a specific angle range is configured to be totally reflected. In the second region (), a relief structure that causes at least one of diffraction, interference, scattering, refraction, and absorption of an electromagnetic wave is disposed and the electromagnetic wave entering from the first layer () side is configured to be reflected by a refractive index difference between the first layer () and the third layer ().

Optical element and information recording medium for counterfeit prevention

This invention aims to provide a novel laminate in which a first layer is formed with high positional accuracy, and to provide a manufacturing method thereof. In the laminate of this invention, a relief structure forming layer includes a first region having an indented structure extending in a first direction or a direction tilted by an angle within 10 degrees to the left or right from the first direction in a plan view, and a second region including an indented structure extending in a second direction orthogonal to the first direction or a direction tilted by an angle within 65 degrees to the left or right from the second direction in a plan view. The first layer contains a first material which is different from a material of the relief structure forming layer, and has a surface shape corresponding to that of the relief structure forming layer.

Laminate comprising a relief structure forming layer and a manufacturing method for same

A unisometric reflection display has a light transmissivity and includes reflectors included in a reflector holding layer of a thin film form. The reflector holding layer has a plurality of sections divided in a direction of a plane of the reflector holding layer. In each of at least two of the sections, reflectors inside incline in a fixed direction and a fixed angle. A direction and/or an angle in which reflectors incline differ between the two sections.

Unisometric reflection display, information holder using unisometric reflection display

A laminate in which a first layer is formed with high positional accuracy, and a manufacturing method thereof is provided. In the laminate of this invention, a relief structure forming layer includes a first region having an indented structure extending in a first direction or a direction tilted by an angle within 10 degrees to the left or right from the first direction in a plan view, and a second region including an indented structure extending in a second direction orthogonal to the first direction or a direction tilted by an angle within 65 degrees to the left or right from the second direction in a plan view. The first layer contains a first material which is different from a material of the relief structure forming layer, and has a surface shape corresponding to that of the relief structure forming layer.

A multiple-image display body includes a spacer layer, a line tone barrier layer stacked on the first surface of the spacer layer, and a multiple-image formation layer stacked on the second surface of the spacer layer. The line tone barrier layer includes first regions, which transmit electromagnetic waves, and second regions, which absorb electromagnetic waves. The multiple-image formation layer includes images that are visible when observed from specific angles over the first regions of the line tone barrier. The image is formed by a contrast resulting from an area ratio of the third region, which scatters electromagnetic waves, and the fourth region, which absorbs electromagnetic waves.

Multiple-image display body

There is provided a versatile optical element applicable both to an electrode layer required in a bank bill field and to an optical element required in an ID field. In an optical element () according to one embodiment of the present invention, a first layer () is arranged on a second layer () having a relief structure on a surface thereof, and a first region () and a second region () are provided. Electromagnetic waves incident at a preset specific angle from a side of the first layer () are totally reflected due to at least one of the relief structure in the first region () and a ratio of a refractive index of the second layer () with respect to a refractive index of the first layer (), the electromagnetic waves incident at the specific angle from the side of the first layer () are not totally reflected but transmitted or refracted due to at least one of the relief structure in the second region () and the ratio of the refractive index of the second layer () with respect to the refractive index of the first layer (), and only in case of observation performed from the specific angle on the first layer () side, the second region () has higher transparency than the first region (), and a preset image is expressed by a transparency contrast therebetween.

Optical element for forgery proof

The object of the present invention is to provide an optical information medium having a colored glossy effect which is single- or multi-colored in regions where a reflective layer is present, but colorless in regions where the reflective layer is absent. The optical information medium of the present invention includes a bonding part (receiving layer), at least one image part, and an adhesive layer (protective layer) covering the at least one image part, wherein each of the image part includes a micro-protrusion/depression structure including part having a micro-protrusion/depression structure on at least a part of the surface opposite to the bonding part, a reflective layer, and a mask layer, in the order from the bonding part (receiving layer), the micro-protrusion/depression structure including part is colorless or colored in one or more translucent or opaque color, and at least one of the micro-protrusion/depression structure including part of the image part is colored in one or more translucent or opaque color.

Optical information medium

An optical element includes a transmission diffraction portion, which reflective portions and transmissive portions. The reflective portions are arranged at equal intervals along a given axis. Each reflective portion reflects light included in the visible light. The light reflected by the reflective portions forms a reflection image. The transmissive portions transmit the visible light. Each transmissive portion is sandwiched by two corresponding reflective portions that are adjacent to each other along the given axis. At least part of each reflective portion forms the reflection image by rendering a reflection angle of the light reflected by the reflective portions different from an angle of light incident on the reflective portions. The transmission diffraction portion forms diffracted images having different colors with diffracted light that is produced by diffracting light transmitted through the transmissive portions in a predetermined direction.

Optical element

A forgery prevention structure, in one configuration, includes a relief forming layer, a first reflection layer, a functional thin film layer, a second reflection layer and a protection layer in this order. In this configuration, the relief forming layer has a relief structure comprising a first relief and a second relief; each of the reliefs has an uneven surface, a surface area of the uneven surface of the first relief being smaller than a surface area of the uneven surface of the second relief; the first reflection layer and the functional thin film layer each are provided along a whole of the uneven surfaces of the reliefs and each has uneven surfaces corresponding respectively to the uneven surfaces of the reliefs; and the second reflection layer and the protection layer each has an uneven surface corresponding to the uneven surface of the first relief.

Coloring forgery prevention structure and coloring forgery prevention medium

A laminated transfer medium that can be used to make a printed matter or the like which includes a fine relief structure with an improved or even high non-defective rate. The laminated transfer medium can form a transfer laminate which contains a fine relief structure section having a fine relief shape onto a transfer target by using a hot stamp, and characterized in that the laminated transfer medium includes a carrier base, a bonding layer formed on the carrier base, a fine relief structure section having a fine relief shape being disposed on the bonding layer, and an adhesive layer formed on the fine relief structure section, wherein the fine relief structure section is made up of separate discrete pieces positioned to be contained in area to be transferred by using the hot stamp.

Laminated transfer medium and printed matter

A unisometric reflection display having a light transmissivity includes reflectors included in a reflector holding layer of a thin film form. The reflectors incline at a fixed direction and a fixed angle to a plane of the reflector holding layer. Light incident from a first direction is reflected on a front surface of a reflector to be inhibited from transmitting through the reflector holding layer. Light incident from a second direction to a reflector is reflected on a front surface of the reflector and a rear surface of another reflector adjacent the reflector at a front surface side, or reflected this way a plurality of times to transmit through the reflector holding layer.

Growing community of inventors

Tokyo, Japan

Kazuhiro Yashiki