Patents by Inventor Kazuya Miyagaki
Kazuya Miyagaki 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: 9431445Abstract: A reflective optical sensor for detecting surface information on a moving element moving in a certain direction includes at least one light emitter, a light emitting lens provided between the light emitter and a surface of the moving element and formed to become conjugated with the light emitter in the moving direction of the moving element in a longer distance from the light emitter than in a vertical direction relative to the moving direction, at least one light receiver, and a light receiving lens provided between the light receiver and the surface of the moving element.Type: GrantFiled: July 31, 2015Date of Patent: August 30, 2016Assignee: RICOH COMPANY, LTD.Inventors: Susumu Momma, Kazuya Miyagaki, Koji Masuda, Hidemasa Suzuki
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Publication number: 20160033914Abstract: A reflective optical sensor for detecting surface information on a moving element moving in a certain direction includes at least one light emitter, a light emitting lens provided between the light emitter and a surface of the moving element and formed to become conjugated with the light emitter in the moving direction of the moving element in a longer distance from the light emitter than in a vertical direction relative to the moving direction, at least one light receiver, and a light receiving lens provided between the light receiver and the surface of the moving element.Type: ApplicationFiled: July 31, 2015Publication date: February 4, 2016Inventors: Susumu MOMMA, Kazuya Miyagaki, Koji Masuda, Hidemasa Suzuki
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Patent number: 8610968Abstract: A document illuminating system includes a plurality of light emitting elements arranged in an array, a reflective element which guides light emitted from the light emitting elements to a document read area of a certain width and length. The reflective element includes first to third reflective portions. The second reflective portion includes one or more planar reflective faces and is disposed so that the reflective faces reflect light from the light emitting elements to one or both of the first and third reflective portions without other reflective elements. The first and third reflective portions each include one or more planar reflective faces and are disposed so that their reflective faces oppositely illuminate the document read area together by reflecting light from one or both of the light emitting elements and the second reflective portion to the document read area without other reflective elements.Type: GrantFiled: March 18, 2013Date of Patent: December 17, 2013Assignee: Ricoh Company, Ltd.Inventors: Atsushi Takaura, Nobuaki Ono, Yasuo Sakurai, Yasunobu Youda, Kazuya Miyagaki, Masahiro Itoh
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Publication number: 20130215482Abstract: A document illuminating system includes a plurality of light emitting elements arranged in an array, a reflective element which guides light emitted from the light emitting elements to a document read area of a certain width and length. The reflective element includes first to third reflective portions. The second reflective portion includes one or more planar reflective faces and is disposed so that the reflective faces reflect light from the light emitting elements to one or both of the first and third reflective portions without other reflective elements. The first and third reflective portions each include one or more planar reflective faces and are disposed so that their reflective faces oppositely illuminate the document read area together by reflecting light from one or both of the light emitting elements and the second reflective portion to the document read area without other reflective elements.Type: ApplicationFiled: March 18, 2013Publication date: August 22, 2013Inventors: Atsushi Takaura, Nobuaki Ono, Yasuo Sakurai, Yasunobu Youda, Kazuya Miyagaki, Masahiro Itoh
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Patent number: 8416471Abstract: A document illuminating system includes a plurality of light emitting elements arranged in an array, a reflective element which guides light emitted from the light emitting elements to a document read area of a certain width and length. The reflective element includes first to third reflective portions. The second reflective portion includes one or more planar reflective faces and is disposed so that the reflective faces reflect light from the light emitting elements to one or both of the first and third reflective portions without other reflective elements. The first and third reflective portions each include one or more planar reflective faces and are disposed so that their reflective faces oppositely illuminate the document read area together by reflecting light from one or both of the light emitting elements and the second reflective portion to the document read area without other reflective elements.Type: GrantFiled: February 25, 2010Date of Patent: April 9, 2013Assignee: Ricoh Company, Ltd.Inventors: Atsushi Takaura, Nobuaki Ono, Yasuo Sakurai, Yasunobu Youda, Kazuya Miyagaki, Masahiro Itoh
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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: 8045249Abstract: An optical scanning device including a light source, a deflection device to deflect a light beam from the light source, an image focus optical system to focus the light beam deflected by the deflection device on a scanned surface to form an image thereon and scan a surface by the light beam deflected by deflection device to form an image thereon, a light path switching device provided between the light source and the deflection device, which switches a light path of the light beam emitted from the light source to deflect the light beam on different timings such that the light beam scans different surfaces.Type: GrantFiled: June 4, 2008Date of Patent: October 25, 2011Assignee: Ricoh Company, Ltd.Inventors: Masanori Kobayashi, Hiroyoshi Funato, Kazuya Miyagaki
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Patent number: 7889224Abstract: A disclosed optical path switching device includes a polarization bistable VCSEL that emits a beam having a rising polarization plane, a laser light source configured to emit a beam having a polarization plane orthogonal to the rising polarization plane, and an optical path switching unit configured to switch an optical path of the beam emitted from the polarization bistable VCSEL by switching the angle of the rising polarization plane of the beam emitted from the polarization bistable VCSEL. The beam emitted from the polarization bistable VCSEL is incident on an entrance window of the optical path switching unit, and the beam emitted from the laser light source is incident on an exit window of the polarization bistable VCSEL.Type: GrantFiled: September 4, 2008Date of Patent: February 15, 2011Assignee: Ricoh Company, Ltd.Inventors: Toshimichi Hagiya, Kazuya Miyagaki, Atsushi Takaura, Toshiaki Tokita
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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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Publication number: 20100214630Abstract: A document illuminating system includes a plurality of light emitting elements arranged in an array, a reflective element which guides light emitted from the light emitting elements to a document read area of a certain width and length. The reflective element includes first to third reflective portions. The second reflective portion includes one or more planar reflective faces and is disposed so that the reflective faces reflect light from the light emitting elements to one or both of the first and third reflective portions without other reflective elements. The first and third reflective portions each include one or more planar reflective faces and are disposed so that their reflective faces oppositely illuminate the document read area together by reflecting light from one or both of the light emitting elements and the second reflective portion to the document read area without other reflective elements.Type: ApplicationFiled: February 25, 2010Publication date: August 26, 2010Inventors: Atsushi TAKAURA, Nobuaki ONO, Yasuo SAKURAI, Yasunobu YOUDA, Kazuya MIYAGAKI, Masahiro ITOH
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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: 7590159Abstract: A surface-emission laser diode includes a distributed Bragg reflector tuned to wavelength of 1.1 ?m or longer, wherein the distributed Bragg reflector includes an alternate repetition of a low-refractive index layer and a high-refractive index layer, with a heterospike buffer layer having an intermediate refractive index interposed therebetween with a thickness in the range of 5-50 nm.Type: GrantFiled: June 7, 2007Date of Patent: September 15, 2009Assignee: Ricoh Company, Ltd.Inventors: Naoto Jikutani, Shunichi Sato, Takashi Takahashi, Akihiro Itoh, Takuro Sekiya, Akira Sakurai, Masayoshi Katoh, Teruyuki Furuta, Kazuya Miyagaki, Ken Kanai, Atsuyuki Watada, Koei Suzuki, Satoru Sugawara, Shinji Satoh, Shuuichi Hikichi
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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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Publication number: 20090080907Abstract: A disclosed optical path switching device includes a polarization bistable VCSEL that emits a beam having a rising polarization plane, a laser light source configured to emit a beam having a polarization plane orthogonal to the rising polarization plane, and an optical path switching unit configured to switch an optical path of the beam emitted from the polarization bistable VCSEL by switching the angle of the rising polarization plane of the beam emitted from the polarization bistable VCSEL. The beam emitted from the polarization bistable VCSEL is incident on an entrance window of the optical path switching unit, and the beam emitted from the laser light source is incident on an exit window of the polarization bistable VCSEL.Type: ApplicationFiled: September 4, 2008Publication date: March 26, 2009Inventors: Toshimichi Hagiya, Kazuya Miyagaki, Atsushi Takaura, Toshiaki Tokita
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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: 20080297870Abstract: An optical scanning device including a light source, a deflection device to deflect a light beam from the light source, an image focus optical system to focus the light beam deflected by the deflection device on a scanned surface to form an image thereon and scan a surface by the light beam deflected by the deflection device to form an image thereon, a light path switching device provided between the light source and the deflection device, which switches a light path of the light beam emitted from the light source to deflect the light beam on different timings such that the light beam scans different surfaces.Type: ApplicationFiled: June 4, 2008Publication date: December 4, 2008Applicant: RICOH COMPANY, LTD.Inventors: Masanori KOBAYASHI, Hiroyoshi Funato, Kazuya Miyagaki
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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