Patents by Inventor Tatsuo Uchida
Tatsuo Uchida 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: 8259384Abstract: An illumination device is provided and includes: a light guide member; a light source provided on one or more side faces of the light guide member; and a light modulating element including a pair of transparent substrates disposed to oppose each other with a gap therebetween, a first electrode provided on a surface of one of the transparent substrates, a second electrode provided on a surface of the other of the transparent substrates, and a light modulation layer provided in the gap and expressing a scattering property or a transparency to light from the light source in accordance with a magnitude of an electric field. The first electrode, the second electrode, or both thereof is patterned, and a density of pattern of the first electrode, the second electrode, or both thereof to which the patterning is applied is varied depending on a distance from the light source.Type: GrantFiled: December 10, 2010Date of Patent: September 4, 2012Assignees: Sony Corporation, Tohoku UniversityInventors: Tatsuo Uchida, Takahiro Ishinabe, Tohru Kawakami, Kentaro Okuyama, Shinpei Nagatani, Akira Ebisui, Masahiro Ikeda
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Patent number: 8199278Abstract: Surface light source device includes: point light sources (13); light guide plate (1) having (i) two end parts in length direction, one of which serves as incident surface (2), and (ii) two end parts in thickness direction which serve as exit surface (7) and back surface (8), light guide plate (1) directing light, emitted from point light sources (13), incident on incident surface (2), so as to cause light to exit from substantially entire area of exit surface (7); and reflector (14) which reflects, toward incident surface (2), part of light which is emitted from point light sources (13) and is then reflected from incident surface (2). Incident surface (2) has elliptic arc (10) which is concave part having surface shape along elliptic arc identical to elliptic arc which is part of ellipse (31) having two focal points corresponding to point light sources (13) and reflector (14).Type: GrantFiled: August 4, 2009Date of Patent: June 12, 2012Assignees: Sharp Kabushiki Kaisha, Tohoku UniversityInventors: Tatsuo Uchida, Yoshito Suzuki, Tohru Kawakami, Takahiro Ishinabe, Baku Katagiri, Yoshihiro Hashimoto, Shoichi Ishihara, Shuichi Kozaki, Yutaka Ishii
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Publication number: 20120127398Abstract: A backlight system includes: a light-emitting section (1) having a plurality of light sources that emit beams of light at different dominant wavelengths from one another; and an imaging optical system (3) including a plurality of microlenses (3a) that focus beams of light emitted from the light-emitting section (1), the backlight system irradiating a liquid crystal panel with beams of light having passed through the imaging optical system (3), the liquid crystal panel including a plurality of pixels arrayed at a predetermined pitch from each other, on the assumption that the pitch at which the pixels are arrayed is denoted as P and the imaging optical system (3) has an imaging magnification of (1/n), the light sources (1) being arrayed at a pitch (P1) given as P1=n×P, the microlenses (3a) being arrayed at a pitch (P2) given as P2=(n/(n+1))×P.Type: ApplicationFiled: June 2, 2010Publication date: May 24, 2012Applicants: TOHOKU UNIVERSITY, SHARP KABUSHIKI KAISHAInventors: Tatsuo Uchida, Yoshito Suzuki, Tohru Kawakami, Kazuo Sekiya, Masahiro Nishizawa, Takahiro Ishinabe, Baku Katagiri, Yoshihiro Hashimoto, Shoichi Ishihara, Shuichi Kozaki, Yutaka Ishii
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Publication number: 20110310330Abstract: According to a conventional backlight device for use in a thin full-color display device in which pixels are subjected to a color separation by colored lights, a large chromatic aberration occurs, thereby causing a deterioration in image quality.Type: ApplicationFiled: October 21, 2009Publication date: December 22, 2011Applicants: TOHOKU UNIVERSITY, SHARP KABUSHIKI KAISHAInventors: Tatsuo Uchida, Yoshito Suzuki, Tohru Kawakami, Kazuo Sekiya, Takahiro Ishinabe, Baku Katagiri, Yoshihiro Hashimoto, Shoichi Ishihara, Shuichi Kozaki, Yutaka Ishii
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Patent number: 8054404Abstract: A dichroic filter column (4) is provided on an incident surface (11). At least one of two end parts of a light guide plate (1) in a thickness direction is divided into a plurality of light guide paths (6), in a width direction of the light guide plate (1) by a plurality of cutout grooves (5). Portions of the plurality of light guide paths (6) on an incident surface (11) side are aligned in accordance with positions of a plurality of dichroic filters (31), respectively. The plurality of dichroic filters (31) are elements of the dichroic filter column (4).Type: GrantFiled: August 4, 2009Date of Patent: November 8, 2011Assignees: Sharp Kabushiki Kaisha, Tohoku UniversityInventors: Tatsuo Uchida, Yoshito Suzuki, Tohru Kawakami, Takahiro Ishinabe, Baku Katagiri, Yoshihiro Hashimoto, Shoichi Ishihara, Shuichi Kozaki, Yutaka Ishii
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Publication number: 20110249221Abstract: A lighting device includes: a light guide plate; a light source disposed on a side face of the light guide plate; and a light modulation element disposed on a surface or in the inside of the light guide plate and adhered to the light guide plate. The light modulation element has a pair of transparent substrates disposed separately and oppositely, a pair of electrodes provided on respective surfaces of the pair of transparent substrates, and a light modulation layer provided in a gap between the pair of transparent substrates. The light modulation layer includes a first region, having optical anisotropy, responsive to an electric field, and a second region, having optical anisotropy, unresponsive to an electric field. The second region has a striped structure with average striped texture size of 0.05 ?m to 10 ?m both inclusive in a short axis direction.Type: ApplicationFiled: March 30, 2011Publication date: October 13, 2011Applicants: Tohoku University, Sony CorporationInventors: Tatsuo Uchida, Takahiro Ishinabe, Tohru Kawakami, Tomoaki Suzuki, Kentaro Okuyama, Akira Ebisui, Harumi Sato, Mamoru Mizuno, Masahiro Ikeda, Shogo Shinkai
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Publication number: 20110242146Abstract: A lighting device includes: a light guide plate; a light source; and a light modulation element disposed on a surface of or in the inside of the light guide plate, and adhered to the light guide plate. The light modulation element has a pair of transparent substrates, a first electrode provided on a surface of one of the transparent substrates, a second electrode provided on a surface of the other of the transparent substrates, and a light modulation layer, provided in a gap between the transparent substrates, exhibiting a light-scattering property or a light-transmitting property concerning light from the light source depending on intensity of an electric field. One or both of the first and second electrodes include partial electrodes. First partial electrodes of the partial electrodes are adjacent to second partial electrodes of the partial electrodes, and have irregular shapes on edges adjacent to the second partial electrodes.Type: ApplicationFiled: March 30, 2011Publication date: October 6, 2011Applicants: Sony Corporation, Tohoku UniversityInventors: Tatsuo Uchida, Takahiro Ishinabe, Tohru Kawakami, Kentaro Okuyama, Mamoru Mizuno
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Publication number: 20110228558Abstract: Conventional planar light source devices have a problem that increasing a utilization ratio of light results in a very narrow angle distribution of light. A planar light source device of the present invention has a light source (1), a light guide plate (2) for introducing light coming from the light source via a light-incident plane of the light guide plate and emits the light from almost all area of a light emission plane, and a light source side reflector (3) for reflecting the light coming from the light source and light which comes from the light source and is reflected by the light-incident plane of the light guide plate so that the reflected light is emitted to the light-incident plane of the light guide plate.Type: ApplicationFiled: October 13, 2009Publication date: September 22, 2011Applicants: SHARP KABUSHIKI KAISHA, TOHOKU UNIVERSITYInventors: Tatsuo Uchida, Yoshito Suzuki, Tohru Kawakami, Takahiro Ishinabe, Baku Katagiri, Yoshihiro Hashimoto, Shoichi Ishihara, Shuichi Kozaki, Yutaka Ishii
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Publication number: 20110199786Abstract: A dichroic filter column (4) is provided on an incident surface (11). At least one of two end parts of a light guide plate (1) in a thickness direction is divided into a plurality of light guide paths (6), in a width direction of the light guide plate (1) by a plurality of cutout grooves (5). Portions of the plurality of light guide paths (6) on an incident surface (11) side are aligned in accordance with positions of a plurality of dichroic filters (31), respectively. The plurality of dichroic filters (31) are elements of the dichroic filter column (4).Type: ApplicationFiled: August 4, 2009Publication date: August 18, 2011Applicants: SHARP KABUSHIKI KAISHA, TOHOKU UNIVERSITYInventors: Tatsuo Uchida, Yoshito Suzuki, Tohru Kawakami, Takahiro Ishinabe, Baku Katagiri, Yoshihiro Hashimoto, Shoichi Ishihara, Shuichi Kozaki, Yutaka Ishii
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Publication number: 20110141551Abstract: An illumination device is provided and includes: a light guide member; a light source provided on one or more side faces of the light guide member; and a light modulating element including a pair of transparent substrates disposed to oppose each other with a gap therebetween, a first electrode provided on a surface of one of the transparent substrates, a second electrode provided on a surface of the other of the transparent substrates, and a light modulation layer provided in the gap and expressing a scattering property or a transparency to light from the light source in accordance with a magnitude of an electric field. The first electrode, the second electrode, or both thereof is patterned, and a density of pattern of the first electrode, the second electrode, or both thereof to which the patterning is applied is varied depending on a distance from the light source.Type: ApplicationFiled: December 10, 2010Publication date: June 16, 2011Applicants: TOHOKU UNIVERSITY, SONY CORPORATIONInventors: Tatsuo Uchida, Takahiro Ishinabe, Tohru Kawakami, Kentaro Okuyama, Shinpei Nagatani, Akira Ebisui, Masahiro Ikeda
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Publication number: 20110141715Abstract: Surface light source device includes: point light sources (13); light guide plate (1) having (i) two end parts in length direction, one of which serves as incident surface (2), and (ii) two end parts in thickness direction which serve as exit surface (7) and back surface (8), light guide plate (1) directing light, emitted from point light sources (13), incident on incident surface (2), so as to cause light to exit from substantially entire area of exit surface (7); and reflector (14) which reflects, toward incident surface (2), part of light which is emitted from point light sources (13) and is then reflected from incident surface (2). Incident surface (2) has elliptic arc (10) which is concave part having surface shape along elliptic arc identical to elliptic arc which is part of ellipse (31) having two focal points corresponding to point light sources (13) and reflector (14).Type: ApplicationFiled: August 4, 2009Publication date: June 16, 2011Applicants: SHARP KABUSHIKI KAISHA, TOHOKU UNIVERSITYInventors: Tatsuo Uchida, Yoshito Suzuki, Tohru Kawakami, Takahiro Ishinabe, Baku KATAGIRI, Yoshihiro Hashmoto, Shoichi Ishihara, Shuichi Kozaki, Yutaka Ishii
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Publication number: 20110109663Abstract: An illuminating device capable of improving display luminance while decreasing light leakage in a range with a large view angle and a display unit are provided. In a light modulation device bonded to a light guide plate, a light modulation layer containing a bulk and microparticles is provided. Both the bulk and the microparticles have optical anisotropy, and each response speed to an electric field is different from each other. Thereby, by controlling the electric field, each optical axis orientation of the bulk and the microparticles is able to correspond with each other, or is able to be different from each other.Type: ApplicationFiled: November 1, 2010Publication date: May 12, 2011Applicants: SONY CORPORATION, TOHOKU UNIVERSITYInventors: Tatsuo Uchida, Takahiro Ishinabe, Tohru Kawakami, Kentaro Okuyama, Harumi Sato
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Publication number: 20100277179Abstract: An evaluation device of ion behavior includes: a voltage oscillator (17) for applying, to a liquid crystal cell, a voltage including a direct-current voltage component and a voltage including no direct-current voltage component; a residual DC voltage measuring section (20) for measuring, per predetermined temperature, a plurality of combinations of (a) an application time during which the voltage including a direct-current voltage component is applied and (b) a residual DC voltage occurring after the application of the voltage; a rate measuring section (21) for measuring, per temperature, an adsorption rate coefficient of ions to an interface between a liquid crystal and an alignment film, and a desorption rate coefficient of ions from the interface, by performing curve fitting according to [Math.Type: ApplicationFiled: August 26, 2008Publication date: November 4, 2010Applicants: SHARP KABUSHIKI KAISHA, TOHOKU UNIVERSITYInventors: Masanobu Mizusaki, Tatsuo Uchida
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Patent number: 7742230Abstract: To realize a diffusion film in which arbitrary control of the diffuse light intensity distribution characteristics, and an angular range of diffusion does not change with respect to an incoming light from a specific angular range and a light-outgoing direction converting element that is high in efficiency of conversion of the outgoing direction, and has no limit in the angle of conversion of the outgoing direction, and to provide a thin-model high-quality projection display using the same as a screen.Type: GrantFiled: September 13, 2005Date of Patent: June 22, 2010Inventors: Tatsuo Uchida, Baku Katagiri, Toru Kawakami, Takahiro Ishinabe
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Publication number: 20100141908Abstract: A rear-projection type projecting device enlarging and projecting an image displayed by a display device onto a screen, including a projecting optical system including a first optical system having a positive power and a second optical system having a reflection surface with a positive power, and a plane mirror attached to the projecting device to form a substantially right angle with respect to the screen and to reflect light emerging from the projecting optical system to the screen, wherein an effective reflection area of the reflection surface with the positive power is located at a position farther from an optical axis of the first optical system when viewed from the plane mirror.Type: ApplicationFiled: January 31, 2008Publication date: June 10, 2010Applicants: TOHOKU UNIVERSITY, HOYA CORPORATIONInventors: Tatsuo Uchida, Tetsuya Abe, Ken Agatsuma
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Publication number: 20090231512Abstract: A display is provided that comprises a reflection board and a display element. The reflection board includes a plurality of first inclinations and a plurality of second inclinations which are alternately arranged to form an uneven reflective surface to reflect and diffuse incident light. The display element has controllable transparency at each pixel and is disposed in front of the reflective surface. The mean inclination angle of the first inclination occurs within a range of 10 to 25 degrees.Type: ApplicationFiled: March 13, 2009Publication date: September 17, 2009Applicants: TOHOKU UNIVERSITY, HOYA CORPORATIONInventors: Tatsuo UCHIDA, Takahiro ISHINABE, Yoshito SUZUKI, Keiji SAWANOBORI
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Publication number: 20090147193Abstract: A liquid crystal display device includes: a liquid crystal panel including a pair of substrates being disposed so as to oppose to each other and having electrodes and alignment films formed respectively on the opposing surfaces thereof, and liquid crystal layer in which nematic liquid crystal encapsulated between the pair of substrates is aligned in the horizontal direction to be at substantially 0° in twist angle by giving a pretilt in a predetermined direction by the alignment film, a polarizing plate(s) being arranged on the front side and back side of the liquid crystal panel and being set in direction of polarization to provide a black level when a drive voltage to be applied between the electrodes is brought into an OFF state, and optical compensating means disposed between the polarizing plate(s) and the liquid crystal panel for performing optical compensation for the liquid crystal layer.Type: ApplicationFiled: February 5, 2009Publication date: June 11, 2009Applicant: Alps Electric Co., Ltd.Inventors: Tatsuo Uchida, Takahiro Ishinabe, Mitsuru Kano, Mitsuo Oizumi
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Publication number: 20090147200Abstract: A highly reliable vertical alignment film for aligning display-use liquid crystal molecules in a direction slightly tilted from the substrate normal line direction and a method of manufacturing the vertical alignment film are provided. A layer composed of a liquid crystalline monomer that has a crystalline framework, and that has characteristics to align the crystalline framework vertically to an interface with a dissimilar material and polymerizable characteristics is formed on a transparent substrate. A magnetic field is applied thereto while the liquid crystal state is maintained, and thereby the liquid crystalline framework of the liquid crystalline monomer is aligned in a direction slightly tilted from the normal line direction of the substrate. In this state, the liquid crystalline monomer is polymerized, and a hardened layer formed from a complex composed of the unreacted liquid crystalline monomer and a liquid crystalline monomer polymer is formed as a vertical alignment film.Type: ApplicationFiled: December 3, 2008Publication date: June 11, 2009Applicants: Sony Corporation, Tohoku UniversityInventors: Kentaro Okuyama, Tatsuo Uchida, Tetsuya Miyashita
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Patent number: 7389677Abstract: In a measuring method for determining values of viscosity coefficients of a liquid crystal by fitting Ericksen-Leslie theoretical values to measured response characteristics, in the first step, ON response characteristics of a liquid crystal cell 10 with homogeneous alignment are initially measured, and a value of a rotational viscosity coefficient ?1 is determined from the measured ON response characteristics. Then, in the second step, OFF response characteristics are measured, and values of Miesovicz shear viscosity coefficients ?1 and ?2 are determined from the measured OFF response characteristics. In the calculation in the first step, the viscosity coefficients other than ?1 are assigned general values. In the calculation in the second step, ?1 is assigned the value determined in the first step.Type: GrantFiled: October 5, 2004Date of Patent: June 24, 2008Assignees: Tohoku Techno-Brains Corporation, Aomori Support Center for Industrial PromotionInventors: Tatsuo Uchida, Tetsuya Miyashita, Takahiro Ishinabe
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Publication number: 20080064922Abstract: A color image pickup and display device that can be simply structured and provided at a low price. A lighting source irradiates lights of primary colors in a manner capable of being switched in a predetermined sequence. Monochrome solid-state image sensors are used as image pickup means, while a backlight type monochrome LCD element is used as a display of a display device. The LCD element can switch the color of backlight to the same color as that of the lighting source synchronously with the switching of color thereof. Thus, the backlight can emit light of the same color as that of the light emitted by the lighting source when the picture signals outputted by the sensors in response to the image observed by the light of the lighting source are displayed by the LCD element.Type: ApplicationFiled: November 10, 2005Publication date: March 13, 2008Applicants: PENTAX CORPORATION, TOHOKU UNIVERSITY, SOYOU CORPORATIONInventors: Tatsuo Uchida, Yoshito Suzuki, Go Sugiura, Yukio Taniguchi