Patents by Inventor Atsushi Takaura
Atsushi Takaura 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).
-
Publication number: 20200015686Abstract: A pulse wave measuring device includes a signal divider configured to divide a first corrected signal and a second corrected signal into a plurality of segments, respectively, each of which corresponds to a cycle of a pulse wave of a living body, the first corrected signal and the second corrected signal being results obtained through a first correction and a second correction respectively using a first signal and a second signal that are extracted from image data and that change in association with the pulse wave; an influence degree calculator configured to calculate a value indicating a degree of a noise influence in each of the first corrected signal and the second corrected signal for each of the plurality of segments; and a peak time detector configured to detect a time of occurrence of a peak in one of the first corrected signal or the second corrected signal.Type: ApplicationFiled: September 23, 2019Publication date: January 16, 2020Applicant: Ricoh Company, Ltd.Inventors: Kazuki Funahashi, Atsushi Takaura, Yasuo Miyoshi
-
Patent number: 9983531Abstract: A moving-member detecting device includes an image acquiring unit and a speed calculating unit. The image acquiring unit includes a light source configured to emit a light beam to a detecting position of a moving member; an area sensor configured to acquire image data of a one- or two-dimensional image; and an area-sensor control unit configured to acquire the image data. The image acquiring unit is configured to acquire pieces of image data of the moving member at first and second positions, respectively, in a moving direction of the moving member so as to acquire the piece of position image data for the second position when the moving member is at the second position after acquiring the piece of image data for the first position. The speed calculating unit is configured to calculate a moving speed of the moving member from the pieces of image data.Type: GrantFiled: August 2, 2013Date of Patent: May 29, 2018Assignee: Ricoh Company, LimitedInventors: Koichi Kudo, Koji Masuda, Hiroyoshi Funato, Takeshi Ueda, Yasuhiro Nihei, Atsushi Takaura
-
Patent number: 9946144Abstract: A projection optical system is disclosed. The projection optical system includes a first optical system configured to form a first image conjugated with an object and a second optical system configured to project a second image conjugated with the first image toward a projection surface. At least one of the first optical system and second optical system includes at least one optical element(s) movable relative to the object is provided. An image distance of the projection optical system is changed and a size of the second image is changed, by moving at least one of the optical element(s) relative to the object.Type: GrantFiled: November 28, 2007Date of Patent: April 17, 2018Assignee: RICOH COMPANY, LTD.Inventors: Issei Abe, Kazuhiro Fujita, Atsushi Takaura
-
Publication number: 20170150892Abstract: A pulse wave measuring device includes a signal divider configured to divide a first corrected signal and a second corrected signal into a plurality of segments, respectively, each of which corresponds to a cycle of a pulse wave of a living body, the first corrected signal and the second corrected signal being results obtained through a first correction and a second correction respectively using a first signal and a second signal that are extracted from image data and that change in association with the pulse wave; an influence degree calculator configured to calculate a value indicating a degree of a noise influence in each of the first corrected signal and the second corrected signal for each of the plurality of segments; and a peak time detector configured to detect a time of occurrence of a peak in one of the first corrected signal or the second corrected signal.Type: ApplicationFiled: November 21, 2016Publication date: June 1, 2017Applicant: Ricoh Company, Ltd.Inventors: Kazuki Funahashi, Atsushi Takaura, Yasuo Miyoshi
-
Patent number: 9228825Abstract: An objective is to achieve a positional change measurement device which measures positional change of a dynamic measured surface by using speckle patterns while easily reducing influence of fluctuations in a measurement environment temperature. Provided is a positional change measurement device including: a light source; an illuminating optical system configured to guide light from the light source to a measured surface; an imaging optical system; an image pickup device configured to acquire a speckle pattern by receiving reflection light from the measured surface via the imaging optical system; and detected-length compensation means for compensating for fluctuations in a detected length caused by temperature fluctuations. Positional change of the measured surface is measured based on a result of cross-correlation computation performed on multiple speckle patterns acquired at predetermined time intervals.Type: GrantFiled: March 13, 2014Date of Patent: January 5, 2016Assignee: RICOH COMPANY, LTD.Inventors: Atsushi Takaura, Koji Masuda, Yasuhiro Nihei, Takeshi Ueda, Koichi Kudo, Taku Amada, Kenichi Shimizu, Asato Tamura
-
Publication number: 20140268180Abstract: An objective is to achieve a positional change measurement device which measures positional change of a dynamic measured surface by using speckle patterns while easily reducing influence of fluctuations in a measurement environment temperature. Provided is a positional change measurement device including: a light source; an illuminating optical system configured to guide light from the light source to a measured surface; an imaging optical system; an image pickup device configured to acquire a speckle pattern by receiving reflection light from the measured surface via the imaging optical system; and detected-length compensation means for compensating for fluctuations in a detected length caused by temperature fluctuations. Positional change of the measured surface is measured based on a result of cross-correlation computation performed on multiple speckle patterns acquired at predetermined time intervals.Type: ApplicationFiled: March 13, 2014Publication date: September 18, 2014Inventors: Atsushi TAKAURA, Koji MASUDA, Yasuhiro NIHEI, Takeshi UEDA, Koichi KUDO, Taku AMADA, Kenichi SHIMIZU, Asato TAMURA
-
Patent number: 8777421Abstract: A projection optical system includes first and second optical systems. The first optical system includes a transmissive-refractive element and the second optical system includes a reflective-refractive element. An image formed by a spatial light modulator is projected by the projection optical system on a projection surface. A light beam that travels along an optical path that leads from the second optical system to the projection surface in an optical path between a center of the image formed by the spatial light modulator and the projection surface is projected at an angle with respect to a normal to the projection surface. An optical axis of the first optical system is folded to a folded position by an optical path deflecting unit in an area of the first optical system where the light beam entering the optical path deflecting unit is a converging light beam or a substantially parallel light beam.Type: GrantFiled: July 26, 2013Date of Patent: July 15, 2014Assignee: Ricoh Company, Ltd.Inventors: Atsushi Takaura, Kazuhiro Fujita, Issei Abe, Akihiro Yamakage, Osamu Nagase, Yoshitsugu Kohno
-
Publication number: 20140044460Abstract: A moving-member detecting device includes an image acquiring unit and a speed calculating unit. The image acquiring unit includes a light source configured to emit a light beam to a detecting position of a moving member; an area sensor configured to acquire image data of a one- or two-dimensional image; and an area-sensor control unit configured to acquire the image data. The image acquiring unit is configured to acquire pieces of image data of the moving member at first and second positions, respectively, in a moving direction of the moving member so as to acquire the piece of position image data for the second position when the moving member is at the second position after acquiring the piece of image data for the first position. The speed calculating unit is configured to calculate a moving speed of the moving member from the pieces of image data.Type: ApplicationFiled: August 2, 2013Publication date: February 13, 2014Applicant: Ricoh Company, LimitedInventors: Koichi KUDO, Koji MASUDA, Hiroyoshi FUNATO, Takeshi UEDA, Yasuhiro NIHEI, Atsushi TAKAURA
-
Publication number: 20140002803Abstract: A projection optical system is disclosed. The projection optical system includes a first optical system configured to form a first image conjugated with an object and a second optical system configured to project a second image conjugated with the first image toward a projection surface. At least one of the first optical system and second optical system includes at least one optical element(s) movable relative to the object is provided. An image distance of the projection optical system is changed and a size of the second image is changed, by moving at least one of the optical element(s) relative to the object.Type: ApplicationFiled: August 30, 2013Publication date: January 2, 2014Inventors: Issei ABE, Kazuhiro Fujita, Atsushi Takaura
-
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
-
Publication number: 20130308106Abstract: A projection optical system includes first and second optical systems. The first optical system includes a transmissive-refractive element and the second optical system includes a reflective-refractive element. An image formed by a spatial light modulator is projected by the projection optical system on a projection surface. A light beam that travels along an optical path that leads from the second optical system to the projection surface in an optical path between a center of the image formed by the spatial light modulator and the projection surface is projected at an angle with respect to a normal to the projection surface. An optical axis of the first optical system is folded to a folded position by an optical path deflecting unit in an area of the first optical system where the light beam entering the optical path deflecting unit is a converging light beam or a substantially parallel light beam.Type: ApplicationFiled: July 26, 2013Publication date: November 21, 2013Inventors: Atsushi TAKAURA, Kazuhiro Fujita, Issei Abe, Akihiro Yamakage, Osamu Nagase, Yoshitsugu Kohno
-
Patent number: 8529070Abstract: A projection optical apparatus capable of providing high image quality and having a reduced size is disclosed. The projection optical apparatus includes a light valve and a projection optical system including a first optical system having a transmissive-refractive element and a second optical system having a reflective-refractive element. An image formed on the light valve is projected by the projection optical system on a projection surface. The optical axis in the first optical system is folded both vertically and horizontally. The first group of the first optical system is contained in a space (dead space) whose lower limit is defined by a lower edge of the second optical system, thereby reducing the depth of the apparatus.Type: GrantFiled: September 2, 2008Date of Patent: September 10, 2013Assignee: Ricoh Company, Ltd.Inventors: Atsushi Takaura, Kazuhiro Fujita, Issei Abe, Akihiro Yamakage, Osamu Nagase, Yoshitsugu Kohno
-
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
-
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
-
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
-
Patent number: 8128238Abstract: Disclosed is a projection optical system including a projection surface configured such that an image conjugate to an object is projected, plural optical elements having a refractive power, and a deflecting element having no refractive power configured to deflect an optical path of a light beam and to pass the light beam having a deflected optical path between the plural optical elements, wherein a normal line of the projection surface at a center of the projection surface does not pass through the plural optical elements or between the plural optical elements.Type: GrantFiled: September 3, 2008Date of Patent: March 6, 2012Assignee: Ricoh Company, Ltd.Inventors: Kazuhiro Fujita, Atsushi Takaura, Issei Abe
-
Patent number: 8025415Abstract: A projection optical system including a first optical system configured to form a second image conjugate to a first image and a second optical system configured to include a reflective optical element which reflects light from the second image and to project a third image conjugate to the second image onto a projection surface is provided, wherein the first optical system includes a stop and at least one optical element with a positive refractive power and at least one optical element with a negative refractive power which are provided between the stop and the second image, and an optical element with a strongest positive refractive power in the at least one optical element with a positive refractive power is provided between the stop and an optical element with a strongest negative refractive power in the at least one optical element with a negative refractive power.Type: GrantFiled: September 13, 2007Date of Patent: September 27, 2011Assignee: Ricoh Company, Ltd.Inventors: Issei Abe, Kazuhiro Fujita, Atsushi Takaura
-
Patent number: RE45258Abstract: In a projection optical system for use in an image projection apparatus illuminating an image display panel forming an image in accordance with a modulating signal with illumination light from a light source, the projection optical system includes first and second optical systems arranged along an optical path defining an upstream-downstream direction in the order described from upstream to downstream on the downstream side of the image display panel. The first optical system includes at least one dioptric system and has positive power. The second optical system includes at least one reflecting surface having power and has positive power. The image formed by the image display panel is formed as an intermediate image in the optical path, and the intermediate image is magnified and projected.Type: GrantFiled: April 11, 2013Date of Patent: November 25, 2014Assignee: Ricoh Company, Ltd.Inventors: Atsushi Takaura, Kazuhiro Fujita, Nobuo Sakuma
-
Patent number: RE45728Abstract: In a projection optical system for use in an image projection apparatus illuminating an image display panel forming an image in accordance with a modulating signal with illumination light from a light source, the projection optical system includes first and second optical systems arranged along an optical path defining an upstream-downstream direction in the order described from upstream to downstream on the downstream side of the image display panel. The first optical system includes at least one dioptric system and has positive power. The second optical system includes at least one reflecting surface having power and has positive power. The image formed by the image display panel is formed as an intermediate image in the optical path, and the intermediate image is magnified and projected.Type: GrantFiled: August 22, 2013Date of Patent: October 6, 2015Assignee: RICOH COMPANY, LTD.Inventors: Atsushi Takaura, Kazuhiro Fujita, Nobuo Sakuma
-
Patent number: RE48309Abstract: In a projection optical system for use in an image projection apparatus illuminating an image display panel forming an image in accordance with a modulating signal with illumination light from a light source, the projection optical system includes first and second optical systems arranged along an optical path defining an upstream-downstream direction in the order described from upstream to downstream on the downstream side of the image display panel. The first optical system includes at least one dioptric system and has positive power. The second optical system includes at least one reflecting surface having power and has positive power. The image formed by the image display panel is formed as an intermediate image in the optical path, and the intermediate image is magnified and projected.Type: GrantFiled: March 17, 2017Date of Patent: November 17, 2020Assignee: RICOH COMPANY, LTD.Inventors: Atsushi Takaura, Kazuhiro Fujita, Nobuo Sakuma