Patents by Inventor Yasuyuki Takiguchi
Yasuyuki Takiguchi 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: 8162485Abstract: An image projection device performing pixel shift in synchronization with sequential updating of image data is disclosed that is able to start and stop pixel shift operations within a period of updating the image frames while maintaining brightness of the image. The image projection device has an intermediate image formation optical system including a light valve able to update an image frame in a line-sequential manner, a pixel shift unit to shift the light path of a light beam from the light valve so as to shift a position of an image formed on the light valve, and an intermediate image formation unit arranged on the light path between the light valve and the pixel shift unit for forming an intermediate image of the image on the light valve at a position of the pixel shift unit.Type: GrantFiled: January 30, 2006Date of Patent: April 24, 2012Assignee: Ricoh Company, Ltd.Inventors: Atsushi Takaura, Takanobu Osaka, Yasuyuki Takiguchi, Toshiaki Tokita, Kazuhiro Fujita, Kazuya Miyagaki, Hiroyuki Sugimoto
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Patent number: 8158020Abstract: A liquid crystal element comprising a pair of transparent substrates, a liquid crystal layer which fills in between the pair of substrates and can form a chiral smectic C phase in homeotropic orientation, and an electrode which generates, at least, an electric field (parallel electric field) in directions parallel to a principal face of the substrate for the liquid crystal layer is provided, wherein the liquid crystal layer comprises, at least, a chiral compound of the following general formula (1-I) or a chiral compound of the following general formula (2-I) and a chiral compound of the following general formula (2 -II) in a base liquid crystal material which can provide a phase sequence of an isotropic liquid phase, a nematic phase, a smectic A phase and a smectic C phase from a higher temperature side, wherein R1, A2, Z1, Z2, m and 1 in formula (1-I), X, R1, R2, and * in formula (2-I), and X, R3, R4, R5, and * in formula (2-II) are defined in the specification.Type: GrantFiled: March 1, 2007Date of Patent: April 17, 2012Assignee: Ricoh Company, Ltd.Inventors: Yohei Takano, Hiroyuki Sugimoto, Toshiaki Tokita, Koh Fujimura, Yasuyuki Takiguchi, Yumi Matsuki, Haruki Amagawa, Toshiaki Nonaka
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Patent number: 7857458Abstract: An image display device is disclosed that has a simplified structure and is able to display a high quality image of high resolution at low cost. The image display device includes a light separation unit configured to extract a light beam having a predetermined wavelength band from light emitted from a light source; a light valve that controls a light beam incident thereon to form a plurality of sub frames of a target image; and a light path shift unit operable to shift a light path of an output light beam from the light valve having the predetermined wavelength band according to a frame period of the target image to locate one or more sub frame of the target image at different positions from other sub frames of the target image formed by the light valve.Type: GrantFiled: November 2, 2005Date of Patent: December 28, 2010Assignee: Ricoh Company, Ltd.Inventors: Kazuhiro Fujita, Atsushi Takaura, Yasuyuki Takiguchi, Toshiaki Tokita, Toshiharu Murai, Hiroyuki Sugimoto, Kazuya Miyagaki, Takanobu Osaka
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Patent number: 7787001Abstract: An image processing apparatus that performs resolution conversion on image data to output to a display unit includes a resolution converting unit configured to perform resolution conversion on the image data to generate pixel data having a resolution ? times as high as a resolution of the display unit, where ?>1; an image processing unit configured to perform an image processing on the pixel data; and a decimation unit configured to decimate the pixel data on which the image processing has been performed, to have a resolution equal to or lower than the resolution of the display unit, and to output decimated data to the display unit.Type: GrantFiled: March 16, 2006Date of Patent: August 31, 2010Assignee: Ricoh Company, LimitedInventors: Kenji Namie, Toshiharu Murai, Toshiaki Tokita, Yasuyuki Takiguchi, Kazuhiro Fujita, Hiroyuki Sugimoto
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Patent number: 7733317Abstract: A reliable image display apparatus is provided that is capable of preventing a direct current from being applied to liquid crystal of a spatial light modulating element so that damage such as burns in the liquid crystal and screen flicker may be prevented and a high resolution image with high image quality may be displayed. The image display apparatus is configured to divide a frame into 2i sub frames (i corresponding to a natural number) and sequentially display the sub frames using the liquid crystal spatial light modulating element. The image display apparatus includes a polarity switching unit configured to reverse the polarity of a drive voltage for a pixel of the spatial light modulating element for every j sub frame(s) (j corresponding to a natural number that is less than 2i) and for every n frame(s)(n corresponding to a natural number).Type: GrantFiled: January 27, 2005Date of Patent: June 8, 2010Assignee: Ricoh Company, Ltd.Inventors: Toshiharu Murai, Kazuhiro Fujita, Kenji Kameyama, Toshiaki Tokita, Yasuyuki Takiguchi
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Patent number: 7564508Abstract: A light path shift device is disclosed that is able to divide an effective region of a light path and drive the divided regions independently. The light path shift device includes a liquid crystal layer held between at least two opposite transparent substrates, the liquid crystal layer being homeotropically aligned and being able to form a chiral smectic C phase; and plural electrodes for applying an electric field in the liquid crystal layer in a horizontal direction. An effective region of the liquid crystal layer through which a light path passes is divided into plural sub-regions, plural light path shift elements with the electrodes formed thereon are stacked only at positions corresponding to the sub-regions, and are arranged so that boundary lines of the sub-regions are in agreement when being viewed along the direction of light propagation.Type: GrantFiled: March 14, 2006Date of Patent: July 21, 2009Assignee: Ricoh Company, Ltd.Inventors: Hiroyuki Sugimoto, Toshiaki Tokita, Kazuhiro Fujita, Toshiharu Murai, Yasuyuki Takiguchi, Atsushi Takaura, Kazuya Miyagaki, Takanobu Osaka
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Patent number: 7495831Abstract: An optical element, an optical device, and a display device are disclosed that are able to change a polarization state in time order and to produce polarized light with little wavelength dependence and superior in polarization purity, and able to perform pixel shift easily and accurately to realize high resolution image display. The optical element has a translucent surface parallel to the rotational axis of the optical element, and at least a portion of the translucent surface is formed from an optically anisotropic medium. A polarization state of a light beam transmitting through the translucent surface is switched in time order along with rotation of the optical element.Type: GrantFiled: August 18, 2005Date of Patent: February 24, 2009Assignee: Ricoh Company, Ltd.Inventors: Toshiaki Tokita, Kazuhiro Fujita, Toshiharu Murai, Atsushi Takaura, Kazuya Miyagaki, Takanobu Osaka, Yasuyuki Takiguchi, Hiroyuki Sugimoto, Yumi Matsuki, Yukiko Hirano
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Publication number: 20080204608Abstract: A liquid crystal element comprising a pair of transparent substrates, a liquid crystal layer which fills in between the pair of substrates and can form a chiral smectic C phase in homeotropic orientation, and an electrode which generates, at least, an electric field (parallel electric field) in directions parallel to a principal face of the substrate for the liquid crystal layer is provided, wherein the liquid crystal layer comprises, at least, a chiral compound of the following general formula (1-I) or a chiral compound of the following general formula (2-I) and a chiral compound of the following general formula (2-II) in a base liquid crystal material which can provide a phase sequence of an isotropic liquid phase, a nematic phase, a smectic A phase and a smectic C phase from a higher temperature side, wherein R1, A2, Z1, Z2, m and I in formula (1-I), X, R1, R2, and * in formula (2-I), and X, R3, R4, R5, and * in formula (2-II) are defined in the specification.Type: ApplicationFiled: March 1, 2007Publication date: August 28, 2008Inventors: Yohei Takano, Hiroyuki Sugimoto, Toshiaki Tokita, Koh Fujimura, Yasuyuki Takiguchi, Yumi Matsuki, Haruki Amagawa, Toshiaki Nonaka
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Publication number: 20080151356Abstract: An image display device is disclosed that has a simplified structure and is able to display a high quality image of high resolution at low cost. The image display device includes a light separation unit configured to extract a light beam having a predetermined wavelength band from light emitted from a light source; a light valve that controls a light beam incident thereon to form a plurality of sub frames of a target image; and a light path shift unit operable to shift a light path of an output light beam from the light valve having the predetermined wavelength band according to a frame period of the target image to locate one or more sub frame of the target image at different positions from other sub frames of the target image formed by the light valve.Type: ApplicationFiled: November 2, 2005Publication date: June 26, 2008Applicant: RICOH COMPANY, LTD.Inventors: Kazuhiro Fujita, Atsushi Takaura, Yasuyuki Takiguchi, Toshiaki Tokita, Toshiharu Murai, Hiroyuki Sugimoto, Kazuya Miyagaki, Takanobu Osaka
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Patent number: 7345733Abstract: A light deflection element has a pair of transparent substrates 2, 3; a chiral smectic C phase liquid crystal 5 with a homeotropic alignment filled between the pair of transparent substrates 2, 3; and at least an electric field applying device 6 for activating an electric field in the liquid crystal 5. Because a chiral smectic C phase liquid crystal is used, the problems of the conventional light deflection element, such as high cost, light loss, large size, and optical noise etc. due to its complicated structure, can be greatly improved. The conventional low response time due to the smectic A phase or the nematic liquid crystal is improved, thereby the high-speed response is possible.Type: GrantFiled: April 11, 2006Date of Patent: March 18, 2008Assignee: Ricoh Comapny, Ltd.Inventors: Hiroyuki Sugimoto, Toshiaki Tokita, Yumi Matsuki, Shigeaki Nimura, Masanori Kobayashi, Yasuyuki Takiguchi, Kenji Kameyama, Ikuo Katoh
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Patent number: 7336411Abstract: A spatial light modulator is disclosed that can be fabricated easily and is able to prevent degradation of a contrast ratio by suppressing a fringe effect. The spatial light modulator includes a light transmission substrate, a liquid crystal layer, a pixel array, and a phase difference generation unit provided between the light transmission substrate and the liquid crystal layer. A lens array is formed on the light transmission substrate, and the lens array has the same pitch as that of the pixel array.Type: GrantFiled: November 23, 2004Date of Patent: February 26, 2008Assignee: Ricoh Company, Ltd.Inventors: Kazuya Miyagaki, Kazuhiro Fujita, Takanobu Osaka, Atsushi Takaura, Hiroyuki Sugimoto, Yasuyuki Takiguchi
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Publication number: 20080030527Abstract: An image processing apparatus that performs resolution conversion on image data to output to a display unit includes a resolution converting unit configured to perform resolution conversion on the image data to generate pixel data having a resolution ? times as high as a resolution of the display unit, where ?>1; an image processing unit configured to perform an image processing on the pixel data; and a decimation unit configured to decimate the pixel data on which the image processing has been performed, to have a resolution equal to or lower than the resolution of the display unit, and to output decimated data to the display unit.Type: ApplicationFiled: March 16, 2006Publication date: February 7, 2008Inventors: Kenji Namie, Toshiharu Murai, Toshiaki Tokita, Yasuyuki Takiguchi, Kazuhiro Fujita, Hiroyuki Sugimoto
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Patent number: 7322700Abstract: An image display apparatus includes an indicating element which modulates or emits light as a pixel in accordance with image information. A displacement unit optically displaces a position of the pixel for each of two or more sub-fields constituting an image field corresponding to the image information. A projection unit enlarges the pixel and projects an enlarged pixel on a screen. A pixel-profile deformation unit changes an optical intensity profile of the pixel.Type: GrantFiled: September 13, 2006Date of Patent: January 29, 2008Assignee: Ricoh Company, Ltd.Inventors: Kazuya Miyagaki, Kenji Kameyama, Takanobu Osaka, Ikuo Katoh, Atsushi Takaura, Kenji Namie, Yasuyuki Takiguchi
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Patent number: 7310181Abstract: An optical deflection device includes an optical deflection element having a pair of transparent boards arranged in a mutually opposing manner. A liquid crystal layer is filled between the boards and forms a chiral smectic C phase. An orientation film orients liquid crystal molecules in the liquid crystal layer in a substantially perpendicular direction with respect to the liquid crystal layer. Electrodes generate an electric field in a substantially parallel direction with respect to the liquid crystal layer. A first voltage application part applies, to the electrodes, an ac voltage of a deflection frequency switching the optical deflection direction of the optical deflection element. A second voltage application part applies, to the electrodes, an ac voltage of a higher frequency than the deflection frequency.Type: GrantFiled: January 4, 2006Date of Patent: December 18, 2007Assignee: Ricoh Company, Ltd.Inventors: Yumi Matsuki, Hiroyuki Sugimoto, Toshiaki Tokita, Shigeaki Nimura, Masanori Kobayashi, Yasuyuki Takiguchi
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Patent number: 7304705Abstract: An imaging unit images light on a light receiving element, and includes an optical path shifting element, and a lens arranged on an input side or an output side of the optical path shifting element. The optical path shifting element includes a liquid crystal layer which is applied with an electrical field in a direction approximately parallel to an in-plane direction. The liquid crystal layer is made of a chiral smectic C phase ferroelectric liquid crystal having a homeotropic alignment. The optical path shifting element shifts an optical path of the light input thereto in an optical path shifting direction.Type: GrantFiled: March 24, 2003Date of Patent: December 4, 2007Assignee: Ricoh Company, Ltd.Inventors: Hiroyuki Sugimoto, Toshiaki Tokita, Yumi Matsuki, Masanori Kobayashi, Yasuyuki Takiguchi
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Publication number: 20070008495Abstract: An image display apparatus includes an indicating element which modulates or emits light as a pixel in accordance with image information. A displacement unit optically displaces a position of the pixel for each of two or more sub-fields constituting an image field corresponding to the image information. A projection unit enlarges the pixel and projects an enlarged pixel on a screen. A pixel-profile deformation unit changes an optical intensity profile of the pixel.Type: ApplicationFiled: September 13, 2006Publication date: January 11, 2007Inventors: Kazuya Miyagaki, Kenji Kameyama, Takanobu Osaka, Ikuo Katoh, Atsushi Takaura, Kenji Namie, Yasuyuki Takiguchi
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Patent number: 7125121Abstract: An image display apparatus includes an indicating element which modulates or emits light as a pixel in accordance with image information. A displacement unit optically displaces a position of the pixel for each of two or more sub-fields constituting an image field corresponding to the image information. A projection unit enlarges the pixel and projects an enlarged pixel on a screen. A pixel-profile deformation unit changes an optical intensity profile of the pixel.Type: GrantFiled: February 24, 2003Date of Patent: October 24, 2006Assignee: Ricoh Company, Ltd.Inventors: Kazuya Miyagaki, Kenji Kameyama, Takanobu Osaka, Ikuo Katoh, Atsushi Takaura, Kenji Namie, Yasuyuki Takiguchi
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Publication number: 20060209295Abstract: A light path shift device is disclosed that is able to divide an effective region of a light path and drive the divided regions independently. The light path shift device includes a liquid crystal layer held between at least two opposite transparent substrates, the liquid crystal layer being homeotropically aligned and being able to form a chiral smectic C phase; and plural electrodes for applying an electric field in the liquid crystal layer in a horizontal direction. An effective region of the liquid crystal layer through which a light path passes is divided into plural sub-regions, plural light path shift elements with the electrodes formed thereon are stacked only at positions corresponding to the sub-regions, and are arranged so that boundary lines of the sub-regions are in agreement when being viewed along the direction of light propagation.Type: ApplicationFiled: March 14, 2006Publication date: September 21, 2006Inventors: Hiroyuki Sugimoto, Toshiaki Tokita, Kazuhiro Fujita, Toshiharu Murai, Yasuyuki Takiguchi, Atsushi Takaura, Kazuya Miyagaki, Takanobu Osaka
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Publication number: 20060192903Abstract: An image projection device performing pixel shift in synchronization with sequential updating of image data is disclosed that is able to start and stop pixel shift operations within a period of updating the image frames while maintaining brightness of the image. The image projection device has an intermediate image formation optical system including a light valve able to update an image frame in a line-sequential manner, a pixel shift unit to shift the light path of a light beam from the light valve so as to shift a position of an image formed on the light valve, and an intermediate image formation unit arranged on the light path between the light valve and the pixel shift unit for forming an intermediate image of the image on the light valve at a position of the pixel shift unit.Type: ApplicationFiled: January 30, 2006Publication date: August 31, 2006Inventors: Atsushi Takaura, Takanobu Osaka, Yasuyuki Takiguchi, Toshiaki Tokita, Kazuhiro Fujita, Kazuya Miyagaki, Hiroyuki Sugimoto
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Publication number: 20060181671Abstract: A light deflection element has a pair of transparent substrates 2, 3; a chiral smectic C phase liquid crystal 5 with a homeotropic alignment filled between the pair of transparent substrates 2, 3; and at least an electric field applying device 6 for activating an electric field in the liquid crystal 5. Because a chiral smectic C phase liquid crystal is used, the problems of the conventional light deflection element, such as high cost, light loss, large size, and optical noise etc. due to its complicated structure, can be greatly improved. The conventional low response time due to the smectic A phase or the nematic liquid crystal is improved, thereby the high-speed response is possible.Type: ApplicationFiled: April 11, 2006Publication date: August 17, 2006Inventors: Hiroyuki Sugimoto, Toshiaki Tokita, Yumi Matsuki, Shigeaki Nimura, Masanori Kobayashi, Yasuyuki Takiguchi, Kenji Kameyama, Ikuo Katoh