Patents by Inventor Tetsuya Sadahiro
Tetsuya Sadahiro 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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Publication number: 20240077665Abstract: Provided are a light guide plate, an area light source device, a display device, and manufacturing method for the light guide plate such that the occurrence of uneven luminance is suppressed. The light guide plate is characterized in that the light guide plate has a light entrance surface through which light enters, a light exit surface intersecting with the light entrance surface and through which light is output, and an opposite surface facing the light entrance surface, wherein the light entering through the light entrance surface is guided to the opposite surface side and output from the light exit surface, and the refractive index Nx in a direction perpendicular to the light entrance surface is higher than the refractive index Ny in a direction parallel to the light exit surface and parallel to the light entrance surface.Type: ApplicationFiled: November 8, 2023Publication date: March 7, 2024Applicant: Dai Nippon Printing Co., Ltd.Inventors: Kohei KOMIZO, Tetsuya SADAHIRO, Hironori HASHIGUCHI, Koujiro OHKAWA
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Publication number: 20230055455Abstract: Provided are a light guide plate, an area light source device, a display device, and manufacturing method for the light guide plate such that the occurrence of uneven luminance is suppressed. The light guide plate is characterized in that the light guide plate has a light entrance surface through which light enters, a light exit surface intersecting with the light entrance surface and through which light is output, and an opposite surface facing the light entrance surface, wherein the light entering through the light entrance surface is guided to the opposite surface side and output from the light exit surface, and the refractive index Nx in a direction perpendicular to the light entrance surface is higher than the refractive index Ny in a direction parallel to the light exit surface and parallel to the light entrance surface.Type: ApplicationFiled: October 13, 2022Publication date: February 23, 2023Applicant: Dai Nippon Printing Co., Ltd.Inventors: Kohei KOMIZO, Tetsuya SADAHIRO, Hironori HASHIGUCHI, Koujiro OHKAWA
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Patent number: 11513276Abstract: Provided are a light guide plate, an area light source device, a display device, and manufacturing method for the light guide plate such that the occurrence of uneven luminance is suppressed. The light guide plate (12) is characterized in that the light guide plate has a light entrance surface (12a) through which light enters, a light exit surface (12c) intersecting with the light entrance surface (12a) and through which light is output, and an opposite surface (12b) facing the light entrance surface (12a), wherein the light entering through the light entrance surface (12a) is guided to the opposite surface (12b) side and output from the light exit surface (12c), and the refractive index Nx in a direction perpendicular to the light entrance surface (12a) is higher than the refractive index Ny in a direction parallel to the light exit surface (12c) and parallel to the light entrance surface (12a).Type: GrantFiled: April 16, 2018Date of Patent: November 29, 2022Assignee: Dai Nippon Printing Co., Ltd.Inventors: Kohei Komizo, Tetsuya Sadahiro, Hironori Hashiguchi, Koujiro Ohkawa
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Publication number: 20210088710Abstract: Provided are a light guide plate, an area light source device, a display device, and manufacturing method for the light guide plate such that the occurrence of uneven luminance is suppressed. The light guide plate (12) is characterized in that the light guide plate has a light entrance surface (12a) through which light enters, a light exit surface (12c) intersecting with the light entrance surface (12a) and through which light is output, and an opposite surface (12b) facing the light entrance surface (12a), wherein the light entering through the light entrance surface (12a) is guided to the opposite surface (12b) side and output from the light exit surface (12c), and the refractive index Nx in a direction perpendicular to the light entrance surface (12a) is higher than the refractive index Ny in a direction parallel to the light exit surface (12c) and parallel to the light entrance surface (12a).Type: ApplicationFiled: April 16, 2018Publication date: March 25, 2021Applicant: Dai Nippon Printing Co., Ltd.Inventors: Kohei KOMIZO, Tetsuya SADAHIRO, Hironori HASHIGUCHI, Koujiro OHKAWA
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Patent number: 9285669Abstract: A reflection screen includes: a reflection layer provided on the back side and adapted to reflect light; and a surface shape layer provided on the reflection layer, at the image source side relative to the reflection screen, the surface shape layer having a plurality of unit optical shapes arrayed and deflecting image light toward the reflection layer side. The unit optical shape satisfies, in a section along the array direction of the unit optical shapes and orthogonal to a screen plane, the relationship of ?+2???>90°, where ? is an angle that a total reflection surface makes with a plane parallel to the screen plane, ? is an angle that an incidence surface makes with a normal direction to the screen plane, and ? is an angle that light incident on the incidence surface makes with the normal direction to the screen plane.Type: GrantFiled: November 26, 2014Date of Patent: March 15, 2016Assignee: Dai Nippon Printing Co., Ltd.Inventors: Tetsuya Sadahiro, Kazunobu Ogawa
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Patent number: 9030736Abstract: A reflection screen includes: a reflection layer provided on the back side and adapted to reflect light; and a surface shape layer provided on the reflection layer, at the image source side relative to the reflection screen, the surface shape layer having a plurality of unit optical shapes arrayed and deflecting image light toward the reflection layer side. The unit optical shape satisfies, in a section along the array direction of the unit optical shapes and orthogonal to a screen plane, the relationship of ?+2???>90°, where ? is an angle that a total reflection surface makes with a plane parallel to the screen plane, ? is an angle that an incidence surface makes with a normal direction to the screen plane, and ? is an angle that light incident on the incidence surface makes with the normal direction to the screen plane.Type: GrantFiled: August 15, 2013Date of Patent: May 12, 2015Assignee: Dai Nippon Printing Co., Ltd.Inventors: Tetsuya Sadahiro, Kazunobu Ogawa
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Publication number: 20150077849Abstract: A reflection screen includes: a reflection layer provided on the back side and adapted to reflect light; and a surface shape layer provided on the reflection layer, at the image source side relative to the reflection screen, the surface shape layer having a plurality of unit optical shapes arrayed and deflecting image light toward the reflection layer side. The unit optical shape satisfies, in a section along the array direction of the unit optical shapes and orthogonal to a screen plane, the relationship of ?+2???>90°, where ? is an angle that a total reflection surface makes with a plane parallel to the screen plane, ? is an angle that an incidence surface makes with a normal direction to the screen plane, and ? is an angle that light incident on the incidence surface makes with the normal direction to the screen plane.Type: ApplicationFiled: November 26, 2014Publication date: March 19, 2015Inventors: Tetsuya SADAHIRO, Kazunobu OGAWA
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Patent number: 8891169Abstract: Provided is an optical sheet hardly causing a change in color depending on the observation angle of an image, the optical sheet including a plurality of layers, at least one of the layers being an optical functional sheet layer including prisms arranged in parallel along a surface of the optical sheet such that light is transmittable; and light-absorbing portions arranged in parallel between the prisms in a way to absorb light, at least another one of the layers being a light diffusing material-containing layer with optical diffusing particles dispersed in a base material, and the optical sheet satisfying a relation of NdK <NdR and vdK <vdR, wherein NdK is a refractive index of the base material of the light diffusing material-containing layer, vdK is an Abbe number thereof, NdR is a refractive index of the optical diffusing particles and vdR is an Abbe number thereof.Type: GrantFiled: September 17, 2009Date of Patent: November 18, 2014Assignee: Dai Nippon Printing Co., Ltd.Inventors: Tsuyoshi Kashiwagi, Tetsuya Sadahiro, Hiroyuki Amemiya, Nobuhiko Ichikawa
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Patent number: 8696187Abstract: An optical member includes a first optical sheet, and a second optical sheet disposed on the light exit side of the first optical sheet. The optical sheets each include a body portion, and unit shaped elements arranged side by side on the body portion. The ratio of the height of the unit shaped elements relative to the arrangement pitch of the unit shaped elements in the first optical sheet is smaller than that in the second optical sheet.Type: GrantFiled: March 24, 2010Date of Patent: April 15, 2014Assignee: Dai Nippon Printing Co., Ltd.Inventors: Masahiro Goto, Tetsuya Sadahiro
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Publication number: 20140092471Abstract: A reflection screen includes: a reflection layer provided on the back side and adapted to reflect light; and a surface shape layer provided on the reflection layer, at the image source side relative to the reflection screen, the surface shape layer having a plurality of unit optical shapes arrayed and deflecting image light toward the reflection layer side. The unit optical shape satisfies, in a section along the array direction of the unit optical shapes and orthogonal to a screen plane, the relationship of ?+2???>90°, where ? is an angle that a total reflection surface makes with a plane parallel to the screen plane, ? is an angle that an incidence surface makes with a normal direction to the screen plane, and ? is an angle that light incident on the incidence surface makes with the normal direction to the screen plane.Type: ApplicationFiled: August 15, 2013Publication date: April 3, 2014Applicant: Dai Nippon Printing Co., Ltd.Inventors: Tetsuya SADAHIRO, Kazunobu OGAWA
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Patent number: 8634136Abstract: There is provided a screen that, as a screen suitable for an interactive board, can output video image light incident obliquely from the back surface side to a viewer side to display a reflection-free image and, at the same time, can realize easy handwriting on the screen surface on the viewer side. To this end, a transmission screen for an interactive board is provided that comprises at least a Fresnel lens sheet comprising a prism part on its incident light side, a light diffusing member provided on the Fresnel lens on its surface side remote from the prism part, and a hard coat layer provided on the outgoing light side of the light diffusing member.Type: GrantFiled: March 25, 2010Date of Patent: January 21, 2014Assignee: Dai Nippon Printing Co., Ltd.Inventors: Kazunobu Ogawa, Takeshi Ogawa, Kenji Ohki, Tetsuya Sadahiro
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Publication number: 20120020081Abstract: An optical member (28) includes a first optical sheet (30), and a second optical sheet (40) disposed on the light exit side of the first optical sheet (30). The optical sheets each include a body portion (32, 42), and unit shaped elements (35, 45) arranged side by side on the body portion. The ratio of the height of the unit shaped elements relative to the arrangement pitch of the unit shaped elements in the first optical sheet is smaller than that in the second optical sheet.Type: ApplicationFiled: March 24, 2010Publication date: January 26, 2012Applicant: Dai Nippon Printing Co., Ltd.Inventors: Masahiro Goto, Tetsuya Sadahiro
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Publication number: 20110216416Abstract: There is provided an optical sheet and a display device which hardly cause a change in color depending on the observation angle of an image. The optical sheet comprises a plurality of layers, at least one of the plurality of layers being an optical functional sheet layer which includes prisms arranged in parallel along a surface of the optical sheet in such a way that light is transmittable; and light-absorbing portions arranged in parallel between the prisms in such a way as to absorb light, at least another one of the layers being a light diffusing material-containing layer with optical diffusing particles dispersed in a sheet-shaped base material, and the optical sheet satisfying a relation of NdK<NdR and ?dK<?dR, wherein NdK is a refractive index of the base material of the light diffusing material-containing layer and ?dK is an Abbe number thereof, and NdR is a refractive index of the optical diffusing particles and ?dR is an Abbe number thereof.Type: ApplicationFiled: September 17, 2009Publication date: September 8, 2011Inventors: Tsuyoshi Kashiwagi, Tetsuya Sadahiro, Hiroyuki Amemiya, Nobuhiko Ichikawa
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Publication number: 20110122493Abstract: There is provided a screen that, as a screen suitable for an interactive board, can output video image light incident obliquely from the back surface side to a viewer side to display a reflection-free image and, at the same time, can realize easy handwriting on the screen surface on the viewer side. To this end, a transmission screen for an interactive board is provided that comprises at least a Fresnel lens sheet comprising a prism part on its incident light side, a light diffusing member provided on the Fresnel lens on its surface side remote from the prism part, and a hard coat layer provided on the outgoing light side of the light diffusing member.Type: ApplicationFiled: March 25, 2010Publication date: May 26, 2011Applicant: Dai Nippon Printing Co., Ltd.Inventors: Kazunobu Ogawa, Takeshi Ogawa, Kenji Ohki, Tetsuya Sadahiro