Patents by Inventor Nobuko Oikawa
Nobuko Oikawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11703798Abstract: An optical member utilizing light from a point light source is enabled to visually perceive a reproduced optical image with a desired color. An optical modulation device includes an optical member having a light control part to reflect or absorb light in a predetermined wavelength and to pass through light in other than the predetermined wavelength in light in at least a visible light band, in accordance with a reproduction reference image for reproducing an original image, and a light transmissive part to pass through light in at least the visible light range including the predetermined wavelength.Type: GrantFiled: November 24, 2017Date of Patent: July 18, 2023Assignee: DAI NIPPON PRINTING CO., LTD.Inventors: Tsuyoshi Yamauchi, Mitsuru Kitamura, Nobuko Oikawa
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Patent number: 11597230Abstract: An object of the present invention is to provide a thin volume hologram sheet to be embedded sufficiently resistant to a mechanical stress such as a stress including a tensile stress, a shear stress and a compression stress at the time of processing even under a heating condition, a forgery prevention paper and a card using the same. The object is achieved by providing a volume hologram sheet to be embedded comprising a volume hologram layer, and a substrate disposed only on one side surface of the volume hologram layer using an adhesion means, wherein a peeling strength of the volume hologram layer and the substrate is 25 gf/25 mm or more.Type: GrantFiled: July 12, 2021Date of Patent: March 7, 2023Assignee: Dai Nippon Printing Co., Ltd.Inventors: Nobuko Oikawa, Minoru Azakami
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Publication number: 20210339555Abstract: An object of the present invention is to provide a thin volume hologram sheet to be embedded sufficiently resistant to a mechanical stress such as a stress including a tensile stress, a shear stress and a compression stress at the time of processing even under a heating condition, a forgery prevention paper and a card using the same. The object is achieved by providing a volume hologram sheet to be embedded comprising a volume hologram layer, and a substrate disposed only on one side surface of the volume hologram layer using an adhesion means, wherein a peeling strength of the volume hologram layer and the substrate is 25 gf/25 mm or more.Type: ApplicationFiled: July 12, 2021Publication date: November 4, 2021Applicant: Dai Nippon Printing Co., Ltd.Inventors: Nobuko Oikawa, Minoru Azakami
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Patent number: 11077698Abstract: An object of the present invention is to provide a thin volume hologram sheet to be embedded sufficiently resistant to a mechanical stress such as a stress including a tensile stress, a shear stress and a compression stress at the time of processing even under a heating condition, a forgery prevention paper and a card using the same. The object is achieved by providing a volume hologram sheet to be embedded comprising a volume hologram layer, and a substrate disposed only on one side surface of the volume hologram layer using an adhesion means, wherein a peeling strength of the volume hologram layer and the substrate is 25 gf/25 mm or more.Type: GrantFiled: April 5, 2019Date of Patent: August 3, 2021Assignee: Dai Nippon Printing Co., Ltd.Inventors: Nobuko Oikawa, Minoru Azakami
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Patent number: 10656597Abstract: To provide an authentication device and method for a security medium including a reflective volume hologram having a light source disposed on the front surface side of the reflective volume hologram so that light emitted therefrom is incident on the reflective volume hologram, a first observation device disposed in a pre-designed diffraction direction of the reflective volume hologram, and a second observation device disposed in a direction other than the pre-designed diffraction direction of the reflective volume hologram. Light including a pre-designed diffraction wavelength is emitted from the light source to be incident on the reflective volume hologram, and when the light amount observed in the first observation device is larger in the diffraction wavelength than in other wavelengths, and the light amount observed in the second observation device is smaller in the diffraction wavelength than in other wavelengths, it is determined that the reflective volume hologram is genuine.Type: GrantFiled: September 7, 2015Date of Patent: May 19, 2020Assignee: Dai Nippon Printing Co., Ltd.Inventors: Mitsuru Kitamura, Tsuyoshi Yamauchi, Koji Eto, Nobuko Oikawa, Tomoe Sato
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Publication number: 20190384222Abstract: An optical member utilizing light from a point light source is enabled to visually perceive a reproduced optical image with a desired color. An optical modulation device includes an optical member having a light control part to reflect or absorb light in a predetermined wavelength and to pass through light in other than the predetermined wavelength in light in at least a visible light band, in accordance with a reproduction reference image for reproducing an original image, and a light transmissive part to pass through light in at least the visible light range including the predetermined wavelength.Type: ApplicationFiled: November 24, 2017Publication date: December 19, 2019Applicant: DAI NIPPON PRINTING CO., LTD.Inventors: Tsuyoshi YAMAUCHI, Mitsuru KITAMURA, Nobuko OIKAWA
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Publication number: 20190232709Abstract: An object of the present invention is to provide a thin volume hologram sheet to be embedded sufficiently resistant to a mechanical stress such as a stress including a tensile stress, a shear stress and a compression stress at the time of processing even under a heating condition, a forgery prevention paper and a card using the same. The object is achieved by providing a volume hologram sheet to be embedded comprising a volume hologram layer, and a substrate disposed only on one side surface of the volume hologram layer using an adhesion means, wherein a peeling strength of the volume hologram layer and the substrate is 25 gf/25 mm or more.Type: ApplicationFiled: April 5, 2019Publication date: August 1, 2019Inventors: Nobuko OIKAWA, Minoru AZAKAMI
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Patent number: 10359735Abstract: A display article includes a plurality of display areas. Display areas adjacent to each other differ in at least one of an average hue, an average brightness and an average chroma and a first object to be displayed is formed by a combination of the plurality of display areas. At least one of the display areas includes a Fourier transform hologram configured to convert incident ray from a point light source or a laser light source into a second object to be displayed.Type: GrantFiled: October 26, 2015Date of Patent: July 23, 2019Assignee: Dai Nippon Printing Co., Ltd.Inventors: Tomoe Sato, Mitsuru Kitamura, Koji Eto, Tsuyoshi Yamauchi, Nobuko Oikawa
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Publication number: 20170315506Abstract: A display article (10) includes a plurality of display areas (12, and 13a to 13c). Display areas adjacent to each other differ in at least one of an average hue, an average brightness and an average chroma and a first object to be displayed (21) is formed by a combination of the plurality of display areas (12, and 13a to 13c). At least one of the display areas (12, 13a to 13c) includes a Fourier transform hologram (20R, 20Y) configured to convert incident ray from a point light source or a laser light source into a second object to be displayed.Type: ApplicationFiled: October 26, 2015Publication date: November 2, 2017Applicant: Dai Nippon Printing Co., Ltd.Inventors: Tomoe SATO, Mitsuru KITAMURA, Koji ETO, Tsuyoshi YAMAUCHI, Nobuko OIKAWA
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Publication number: 20170308036Abstract: To provide an authentication device and method for a security medium including a reflective volume hologram, capable of easily performing authentication determination and a security medium including the reflective volume hologram. An authenticity determination device 1 for a security medium 10 including a reflective volume hologram 2 includes a light source L disposed on the front surface side of the reflective volume hologram 2 so that light emitted therefrom is incident on the reflective volume hologram 2, a first observation device 11 disposed in a pre-designed diffraction direction of the reflective volume hologram 2, and a second observation device 12 disposed in a direction other than the pre-designed diffraction direction of the reflective volume hologram 2.Type: ApplicationFiled: September 7, 2015Publication date: October 26, 2017Applicant: Dai Nippon Printing Co., Ltd.Inventors: Mitsuru KITAMURA, Tsuyoshi YAMAUCHI, Koji ETO, Nobuko OIKAWA, Tomoe SATO
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Patent number: 9709952Abstract: The present invention is to provide: a photosensitive composition for volume hologram recording and a photosensitive substrate for volume hologram recording, which provide increased sensitivity during hologram recording and a high refractive index modulation amount, and which do not inhibit the decolorization of the sensitizing dye; and a volume hologram recorded medium which provides high-luminance hologram images with increased productivity.Type: GrantFiled: August 22, 2013Date of Patent: July 18, 2017Assignee: DAI NIPPON PRINTING CO., LTD.Inventors: Minoru Azakami, Koji Eto, Nobuko Oikawa, Eriko Hamade, Keisuke Miura
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Publication number: 20170157971Abstract: An object of the present invention is to provide a thin volume hologram sheet to be embedded sufficiently resistant to a mechanical stress such as a stress including a tensile stress, a shear stress and a compression stress at the time of processing even under a heating condition, a forgery prevention paper and a card using the same. The object is achieved by providing a volume hologram sheet to be embedded comprising a volume hologram layer, and a substrate disposed only on one side surface of the volume hologram layer using an adhesion means, wherein a peeling strength of the volume hologram layer and the substrate is 25 gf/25 mm or more.Type: ApplicationFiled: February 17, 2017Publication date: June 8, 2017Inventors: Nobuko OIKAWA, Minoru AZAKAMI
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Patent number: 9213311Abstract: The present invention provides a volume hologram transfer foil which has good foil cutting characteristics and is used to manufacture a volume hologram laminate by transferring a volume hologram layer to an adherend by thermocompression. The volume hologram transfer foil includes a base material, a protective layer, a volume hologram layer, and a heat seal layer, wherein the protective layer contains a hard coat component, a rupture elongation control component, and a foil cutting characteristic control component which has a thermal expansion coefficient different from those of the hard coat component and rupture elongation control component and is incompatible with the two components.Type: GrantFiled: July 13, 2011Date of Patent: December 15, 2015Assignee: DAI NIPPON PRINTING CO., LTD.Inventors: Dai Tsukada, Koji Eto, Nobuko Oikawa, Minoru Azakami, Takaki Miyachi, Shinya Sato
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Publication number: 20150212487Abstract: The present invention is to provide: a photosensitive composition for volume hologram recording and a photosensitive substrate for volume hologram recording, which provide increased sensitivity during hologram recording and a high refractive index modulation amount, and which do not inhibit the decolorization of the sensitizing dye; and a volume hologram recorded medium which provides high-luminance hologram images with increased productivity.Type: ApplicationFiled: August 22, 2013Publication date: July 30, 2015Inventors: Minoru Azakami, Koji Eto, Nobuko Oikawa, Eriko Hamade, Keisuke Miura
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Publication number: 20130182301Abstract: A primary object of the invention is to provide a volume hologram transfer foil which has good foil cutting characteristics and is used to manufacture a volume hologram laminate by transferring a volume hologram layer to an adherend by thermocompression. The above problem is solved by a volume hologram transfer foil comprising a base material, a protective layer formed on the base material, a volume hologram layer formed on the protective layer and having a volume hologram recorded, and a heat seal layer formed on the volume hologram layer, wherein the protective layer contains a hard coat component formed of an ionizing radiation-curable resin, a rupture elongation control component which improves the rupture elongation of the protective layer, and a foil cutting characteristic control component which has a thermal expansion coefficient different from those of the hard coat component and rupture elongation control component and is incompatible with the two components.Type: ApplicationFiled: July 13, 2011Publication date: July 18, 2013Applicant: DAI NIPPON PRINTING CO., LTD.Inventors: Dai Tsukada, Koji Eto, Nobuko Oikawa, Minoru Azakami, Takaki Miyachi, Shinya Sato
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Publication number: 20120286504Abstract: An object of the present invention is to provide a thin volume hologram sheet to be embedded sufficiently resistant to a mechanical stress such as a stress including a tensile stress, a shear stress and a compression stress at the time of processing even under a heating condition, a forgery prevention paper and a card using the same. The object is achieved by providing a volume hologram sheet to be embedded comprising a volume hologram layer, and a substrate disposed only on one side surface of the volume hologram layer using an adhesion means, wherein a peeling strength of the volume hologram layer and the substrate is 25 gf/25 mm or more.Type: ApplicationFiled: January 18, 2011Publication date: November 15, 2012Applicant: DAI NIPPON PRINTING CO., LTD.Inventors: Nobuko Oikawa, Minoru Azakami