Patents by Inventor Takanobu Osaka
Takanobu Osaka 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: 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: 7753531Abstract: An image display apparatus acquires a high-quality image by suppressing positional fluctuation of projected dots due to a positional offset of an optical path deflecting element. A spatial light modulation element (1) displays an image by projecting a light from an illumination light source. A projection optical system (3) enlarges and projects the image formed on the spatial light modulation element (1). An optical path deflecting element (2) is provided between the spatial light modulation element (1) and the image formed on a screen (4) so as to deflect an optical path in accordance with a screen frame period. The optical path deflecting element (2) shifts the optical path for the image projected on the screen (4) at a high rate so as to apparently increase a number of picture elements. The optical path deflecting element (2) is located within the projection optical system.Type: GrantFiled: May 11, 2005Date of Patent: July 13, 2010Assignee: Ricoh Company, Ltd.Inventors: Kazuhiro Fujita, Takanobu Osaka, Kazuya Miyagaki, Atsushi Takaura, Masanori Kobayashi, Hiroyuki Sugimoto, Kenji Namie, Yumi Matsuki, Toshiaki Tokita
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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: 7561336Abstract: A micro-optical device includes a plurality of minute optical elements each having a curved surface operable to condense incident light. The minute optical elements are arranged at constant intervals. The curved surface is expressed by two or more F values. Each of the minute optical elements is a transmission lens element having the curved surface including a substantially flat part at a center of the transmission lens element, wherein the curved surface is convex or concave.Type: GrantFiled: December 8, 2005Date of Patent: July 14, 2009Assignee: Ricoh Company, Ltd.Inventors: Takanobu Osaka, Atsushi Takaura, Kazuhiro Fujita, Kazuya Miyagaki
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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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Patent number: 7489383Abstract: An optical axis deflecting element is provided with a pair of transparent substrates, a liquid crystal layer disposed between substrate surfaces of the pair of transparent substrates and having a chiral smectic C-phase forming a homeotropic orientation, and a plurality of electrode pairs each defining one of a plurality of divided regions into which an effective region of the liquid crystal layer is divided, wherein an electric field is independently applicable to each divided region defined by a corresponding electrode pair in a direction parallel to the substrate surfaces.Type: GrantFiled: April 24, 2006Date of Patent: February 10, 2009Assignee: Ricoh Company, Ltd.Inventors: Hiroyuki Sugimoto, Yumi Matsuki, Yukiko Hirano, Kenji Namie, Toshiaki Tokita, Takanobu Osaka, Koh Fujimura
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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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Publication number: 20080094718Abstract: A micro-optical device includes a plurality of minute optical elements each having a curved surface operable to condense incident light. The minute optical elements are arranged at constant intervals. The curved surface is expressed by two or more F values.Type: ApplicationFiled: December 8, 2005Publication date: April 24, 2008Inventors: Takanobu Osaka, Atsushi Takaura, Kazuhiro Fujita, Kazuya Miyagaki
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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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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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Publication number: 20070268541Abstract: An image display apparatus acquires a high-quality image by suppressing positional fluctuation of projected dots due to a positional offset of an optical path deflecting element. A spatial light modulation element (1) displays an image by projecting a light from an illumination light source. A projection optical system (3) enlarges and projects the image formed on the spatial light modulation element (1). An optical path deflecting element (2) is provided between the spatial light modulation element (1) and the image formed on a screen (4) so as to deflect an optical path in accordance with a screen frame period. The optical path deflecting element (2) shifts the optical path for the image projected on the screen (4) at a high rate so as to apparently increase a number of picture elements. The optical path deflecting element (2) is located within the projection optical system.Type: ApplicationFiled: May 11, 2005Publication date: November 22, 2007Inventors: Kazuhiro Fujita, Takanobu Osaka, Kazuya Miyagaki, Atsushi Takaura, Masanori Kobayashi, Hiroyuki Sugimoto, Kenji Namie, Yumi Matsuki, Toshiaki Tokita
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Publication number: 20070216316Abstract: A disclosed electric field generating device includes an electric field generating unit including a substrate, line electrodes, and an electric field generating resistor and configured to generate an electric field. In the disclosed electric field generating device, the line electrodes are formed on at least one side of the substrate in parallel with each other so as to divide the side of the substrate into multiple sections; the electric field generating resistor is shaped like a strip and positioned so as to touch a part of each of the line electrodes; and some of the line electrodes have connectors for electric connection.Type: ApplicationFiled: March 12, 2007Publication date: September 20, 2007Inventors: Yukiko HIRANO, Toshiaki Tokita, Koh Fujimura, Yumi Matsuki, Toshimichi Hagiya, Takanobu Osaka, Masanori Kobayashi, Yohei Takano
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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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Publication number: 20060250543Abstract: An optical axis deflecting element is provided with a pair of transparent substrates, a liquid crystal layer disposed between substrate surfaces of the pair of transparent substrates and having a chiral smectic C-phase forming a homeotropic orientation, and a plurality of electrode pairs each defining one of a plurality of divided regions into which an effective region of the liquid crystal layer is divided, wherein an electric field is independently applicable to each divided region defined by a corresponding electrode pair in a direction parallel to the substrate surfaces.Type: ApplicationFiled: April 24, 2006Publication date: November 9, 2006Inventors: Hiroyuki Sugimoto, Yumi Matsuki, Yukiko Hirano, Kenji Namie, Toshiaki Tokita, Takanobu Osaka, Koh Fujimura
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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: 20060039068Abstract: 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: ApplicationFiled: August 18, 2005Publication date: February 23, 2006Inventors: 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: 20050111072Abstract: 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: ApplicationFiled: November 23, 2004Publication date: May 26, 2005Inventors: Kazuya Miyagaki, Kazuhiro Fujita, Takanobu Osaka, Atsushi Takaura, Hiroyuki Sugimoto, Yasuyuki Takiguchi
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Publication number: 20030222980Abstract: 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: February 24, 2003Publication date: December 4, 2003Inventors: Kazuya Miyagaki, Kenji Kameyama, Takanobu Osaka, Ikuo Katoh, Atsushi Takaura, Kenji Namie, Yasuyuki Takiguchi