Dai Nippon Printing Co., Ltd.

Satoru Hamada

Kenji Ueda

Hiroyuki Ohtaki

Akio Morii

Shingo Nishikawa

Keiji Kashima

Takashi Kuroda

Hiroshi Yamamoto

Hiroyuki Nishimura

Toshiharu Ishikawa

Shoji Takeshige

Junichi Sawanobori

Hirofumi Yumoto

Disclosed is a selectively reflective member which can uniformly reflect only a desired wavelength with high efficiency even in a large area and, at the same time, is highly cost effective. Specifically, there is provided an electromagnetic wave reflecting member that reflects electromagnetic waves with a specific wavelength, the electromagnetic wave reflecting member comprising a first selectively reflective layer that reflects only a clockwise or counterclockwise circularly polarized light component with wavelength &#x3bb; in incident electromagnetic waves, a phase difference layer, and a second selectively reflective layer that reflects only a clockwise or counterclockwise circularly polarized light component with wavelength &#x3bb;, provided in that order, the phase difference layer having a retardation satisfying the following equation:={(2+1)/2&#xb1;0.2}&#xd7;&#x3bb;wherein Re represents average retardation; &#x3bb; represents wavelength; and n is an integer of 1 or more.

Electromagnetic wave reflecting member

Method for producing an electromagnetic wave reflective film by a first selective reflection layer forming process of using a transparent substrate; applying a first selective reflection layer forming coating solution on the transparent substrate to form a first selective reflection layer forming layer; irradiating the first selective reflection layer forming layer with ultraviolet rays at a dose in the range of 25 mJ/cmto 800 mJ/cm; and thereby forming a first selective reflection layer; and a second selective reflection layer forming process of: using a second selective reflection layer forming coating solution; applying the second selective reflection layer forming coating solution on the first selective reflection layer so as to be in direct contact therewith to form a second selective reflection layer forming layer; irradiating the second selective reflection layer forming layer with ultraviolet rays; and thereby forming a second selective reflection layer.

Electromagnetic wave reflective film and method for producing same

A polarizing plate protection film and a polarizing plate which can restrain generation of rainbow-like irregularities and enables to produce an excellent quality liquid crystal display device when a commercially-available film is used as it is under commercially-available conditions or when a film produced by a common film forming method is used. The polarizing plate protection film includes: a transparent substrate; and a refractive index difference-mitigating part formed on the transparent substrate and provided with a low refractive index layer at its most outer layer, in which the low refractive index layer has a refractive index to the light transmitted through the transparent substrate smaller than that of the transparent substrate and bigger than that of the air. An in-plane distribution of the in-plane retardation (Re) of the transparent substrate is 5 nm or more.

Polarizing plate protection film, polarizing plate, and liquid crystal display device

A main object of the present invention is to provide a rotating plate hardly generating variation in the rotation angle of the liner polarization so as to easily realize a desired rotation angle, and a liquid crystal display device enabling observation of a bright image by use thereof even in a state with a polarizing glasses put on. To attain the object, the present invention provides an optical rotation plate comprising a transparent substrate, and an optical rotation layer formed on the transparent substrate and containing a rod-shaped compound for forming a cholesteric structure and having a function of rotating transmitted liner polarization, wherein the cholesteric structure has a 90 degrees or larger twist angle and a pitch in a range of 450 nm to 4,000 nm.

Optical rotation plate and liquid crystal display device using the same

An optical sheet is structured to have a translucent substrate, an optical elementprovided on one surface Sof the translucent substrate, on which a plurality of unit prismsor unit lenses are arranged, and a light diffusion layer provided between the one surface Sand the optical elementand/or on another surface Sof the translucent substrate, and at least one of the light diffusion layerincludes gap partsas a light diffusion element. At this time, the gap partsis preferably in an approximately oval shape oriented in a uniaxial direction in plan view.

Optical sheet, surface light source and display device

A multilayered volume hologram structure of the invention comprises a substratefor a certificate or the like, and an adhesive layer, a volume hologram layerand a surface protective filmlaminated on the substrate in the described order. When a multilayer structure consisting of the volume hologram layerand surface protective layeris forcibly released from the substrate for the purpose of making a photograph replacement or falsifying a personal information area, the volume hologram image can break down certainly, thereby ensuring prevention of falsification. A multilayered volume hologram structure-making label is useful for making a multilayered volume hologram structure.

Multilayered volume hologram structure and label for making multilayered volume hologram structure

A simplified method is provided for recording identification information, such as a serial number or the like, in a hologram-recorded film simultaneously with hologram duplication. The method includes the steps of coupling a hologram recording film with a master hologram plate having a master hologram, the master hologram plate having a reflective area adjacent the master hologram; and directing laser beams towards the master hologram plate to induce interference between incident laser light and diffraction laser light from the master hologram in the recording film, at least some of the laser beams radiating the reflective area through a transmission type controllable display device to record a pattern in the hologram recording film corresponding to a pattern displayed at the transmission type controllable display device.

Hologram film having identification information recorded thereon and method for manufacturing the same

A multilayered volume hologram structure of the invention comprises a substratefor a certificate or the like, and an adhesive layera volume hologram layerand a surface protective filmlaminated on the substrate in the described order. When a multilayer structure consisting of the volume hologram layerand surface protective layeris forcibly released from the substrate for the purpose of making a photograph replacement or falsifying a personal information area, the volume hologram image can break down certainly, thereby ensuring prevention of falsification. A multilayered volume hologram structure-making label is useful for making a multilayered volume hologram structure.

Multilayered volume hologram structure, and label for making multilayered volume hologram structure

A multilayered volume hologram structure of the invention comprises a substrate for a certificate or the like, and an adhesive layer , a volume hologram layer and a surface protective film laminated on the substrate in the described order. When a multilayer structure consisting of the volume hologram layer and surface protective layer is forcibly released from the substrate for the purpose of making a photograph replacement or falsifying a personal information area, the volume hologram image can break down certainly, thereby ensuring prevention of falsification. A multilayered volume hologram structure-making label is useful for making a multilayered volume hologram structure.

A multilayered volume hologram structure of the invention comprises a substrate for a certificate or the like, and an adhesive layer a volume hologram layer and a surface protective film laminated on the substrate in the described order. When a multilayer structure consisting of the volume hologram layer and surface protective layer is forcibly released from the substrate for the purpose of making a photograph replacement or falsifying a personal information area, the volume hologram image can break down certainly, thereby ensuring prevention of falsification. A multilayered volume hologram structure-making label is useful for making a multilayered volume hologram structure.

Volume hologram laminate and label for preparing volume hologram laminate

A hologram duplicating method and apparatus whereby a photosensitive material film is continuously and smoothly brought into close contact with the surface of a hologram original plate, and the film is effectively delaminated after a duplicating process. The apparatus includes a film supply part (31) for supplying a photosensitive material film (1), a film laminating part for successively laminating the supplied film (1) on a hologram original plate (35) with the film (1) being squeezed with a roller (46) from the upper side, a film delaminating part for successively delaminating the film (1) from the original plate (35) from one end thereof with the film (1) being pressed with the roller (46), and a film take-up part (43) for taking up the delaminated film. The film (1) can be laminated on the original plate (35) without trapping air bubbles, and the film (1) can be delaminated from the original plate (35) without causing peel unevenness such as undesired lines. Also disclosed is a hologram produced by the duplicating method.

Growing community of inventors

Tokyo, Japan

Satoru Hamada