Patents by Inventor Eiki Yoshimizu
Eiki Yoshimizu 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).
-
Patent number: 10680471Abstract: A permanent magnet motor is provided, which includes a rotor including a rotation axle and a plurality of magnetized rotor magnets on a periphery, which rotor magnets are magnetized to form alternately N-poles and S-poles; first and second ring-shaped-claw-pole units, whose inner circumferences face the rotor magnets, including a plurality of first and second claw-poles along the inner circumference, the first and the second claw-poles being closely adjacent to each other extending alternately in upward and downward axis directions of the rotation axle, bottom sides of the first and the second claw-poles forming a ring shape. A first opening portion is formed in a first joint surface of the first ring-shaped-claw-pole unit, to be joined to the second ring-shaped-claw-pole unit, and the second opening portion is formed in a second joint surface of the second ring-shaped-claw-pole unit, to be joined to the first ring-shaped-claw-pole unit.Type: GrantFiled: November 23, 2015Date of Patent: June 9, 2020Assignee: RICOH COMPANY, LTD.Inventors: Takashi Hashimoto, Takahisa Koike, Haruyuki Suzuki, Eiki Yoshimizu, Norihiro Yamamoto
-
Patent number: 10026516Abstract: There is provided a collimator apparatus including a first collimator configured to prevent a leakage of radiation, wherein a target for converting electron beam emitted from an electron beam source into the radiation is disposed in the first collimator, and a second collimator, wherein the radiation passes through the second collimator along a central axis of the second collimator, the second collimator being disposed in an inner space formed in the first collimator, a gap between a surface of the inner space and the second collimator being provided, wherein the second collimator swings within the inner space of the first collimator.Type: GrantFiled: July 27, 2016Date of Patent: July 17, 2018Assignee: Accuthera Inc.Inventors: Eiki Yoshimizu, Hiroshi Koide, Masashi Yamamoto, Masaaki Ito
-
Patent number: 9999786Abstract: A radiation emitting apparatus includes a radiation source to generate radiation, a first collimator to define a maximum radiation field of the radiation; a second collimator to regulate the radiation field and direction of irradiation; a swing portion that swings in two directions orthogonal to each other; a displacement detector to detect displacement of the second collimator relative to a reference point; a drive mechanism to drive the swing portion; a control unit to control the drive mechanism; and a storage unit included in the control unit to store one or more parameters related to mechanical movement of the swing portion. The control unit generates feedforward control information based on an inputted target swing angle, a detected displacement, and the one or more parameters stored in the storage unit, and outputs a drive signal containing the feedforward control information to the drive mechanism.Type: GrantFiled: July 14, 2017Date of Patent: June 19, 2018Assignee: ACCUTHERA INC.Inventors: Eiki Yoshimizu, Atsuyuki Oyamada
-
Publication number: 20180036557Abstract: A radiation therapy apparatus includes a manipulator; a radiation head; a correction unit; and first and second controllers. The manipulator includes an arm movable about n axes (where n is 6 or more). The radiation head, supported by the arm, is configured to emit radiation. The correction unit continuously corrects positional coordinates of the radiation head on the manipulator so that radiation emitted from the radiation head is directed onto a reference point while the radiation head is moved along a predetermined route on a virtual sphere having the reference point as its center. The first controller controls the manipulator so that the radiation head is moved along the route using the corrected positional coordinates. The second controller causes the radiation head to emit radiation toward the reference point as the radiation head passes through radiation emission points on the route.Type: ApplicationFiled: August 3, 2017Publication date: February 8, 2018Applicant: Accuthera Inc.Inventors: Eiki Yoshimizu, Takashi Kiuchi
-
Publication number: 20180028839Abstract: A radiation emitting apparatus includes a radiation source to generate radiation, a first collimator to define a maximum radiation field of the radiation; a second collimator to regulate the radiation field and direction of irradiation; a swing portion that swings in two directions orthogonal to each other; a displacement detector to detect displacement of the second collimator relative to a reference point; a drive mechanism to drive the swing portion; a control unit to control the drive mechanism; and a storage unit included in the control unit to store one or more parameters related to mechanical movement of the swing portion. The control unit generates feedforward control information based on an inputted target swing angle, a detected displacement, and the one or more parameters stored in the storage unit, and outputs a drive signal containing the feedforward control information to the drive mechanism.Type: ApplicationFiled: July 14, 2017Publication date: February 1, 2018Applicant: Accuthera Inc.Inventors: Eiki Yoshimizu, Atsuyuki Oyamada
-
Patent number: 9749486Abstract: A sheet feeder is provided. The sheet feeder includes a roller to feed a sheet, a motor to rotate the roller, and a motor controller to control rotation of the motor by a feedback control. The motor controller detects a condition of the sheet based on a value acquired in the feedback control at the time a load is applied from the sheet to the roller, while performing a stop control to stop the roller at a designated stop position. The stop control is performed after the motor is rotated in a direction opposite to a direction of feed of the sheet.Type: GrantFiled: October 29, 2015Date of Patent: August 29, 2017Assignee: RICOH COMPANY, LTD.Inventor: Eiki Yoshimizu
-
Publication number: 20170032864Abstract: There is provided a collimator apparatus including a first collimator configured to prevent a leakage of radiation, wherein a target for converting electron beam emitted from an electron beam source into the radiation is disposed in the first collimator, and a second collimator, wherein the radiation passes through the second collimator along a central axis of the second collimator, the second collimator being disposed in an inner space formed in the first collimator, a gap between a surface of the inner space and the second collimator being provided, wherein the second collimator swings within the inner space of the first collimator.Type: ApplicationFiled: July 27, 2016Publication date: February 2, 2017Applicants: Ricoh Company, Ltd., Accuthera Inc.Inventors: Eiki YOSHIMIZU, Hiroshi KOIDE, Masashi YAMAMOTO, Masaaki ITO
-
Patent number: 9517905Abstract: A separation conveyance device comprises: a separation unit that includes a first roller feeding a conveyance object, and a load unit applying a load to the fed conveyance object, and separates one conveyance object from conveyance objects; a second roller that conveys the fed conveyance object; a driving unit that causes a motor to rotate the first roller at a first linear speed and the second roller at a second linear speed higher than the first linear speed; a connection unit that cuts off the motor's power from the first roller when first load torque toward a rotation direction of the first roller is equal to or larger than a certain value; a detection unit that detects second load torque in the direction opposite to a rotation direction of the motor; and a determination unit that determines a separation state of the conveyance object based on the second load torque.Type: GrantFiled: June 8, 2015Date of Patent: December 13, 2016Assignee: Ricoh Company, LimitedInventor: Eiki Yoshimizu
-
Publication number: 20160149443Abstract: A permanent magnet motor is provided, which includes a rotor including a rotation axle and a plurality of magnetized rotor magnets on a periphery, which rotor magnets are magnetized to form alternately N-poles and S-poles; first and second ring-shaped-claw-pole units, whose inner circumferences face the rotor magnets, including a plurality of first and second claw-poles along the inner circumference, the first and the second claw-poles being closely adjacent to each other extending alternately in upward and downward axis directions of the rotation axle, bottom sides of the first and the second claw-poles forming a ring shape. A first opening portion is formed in a first joint surface of the first ring-shaped-claw-pole unit, to be joined to the second ring-shaped-claw-pole unit, and the second opening portion is formed in a second joint surface of the second ring-shaped-claw-pole unit, to be joined to the first ring-shaped-claw-pole unit.Type: ApplicationFiled: November 23, 2015Publication date: May 26, 2016Applicant: Ricoh Company, Ltd.Inventors: Takashi HASHIMOTO, Takahisa KOIKE, Haruyuki SUZUKI, Eiki YOSHIMIZU, Norihiro YAMAMOTO
-
Publication number: 20160139554Abstract: A sheet feeder is provided. The sheet feeder includes a roller to feed a sheet, a motor to rotate the roller, and a motor controller to control rotation of the motor by a feedback control. The motor controller detects a condition of the sheet based on a value acquired in the feedback control at the time a load is applied from the sheet to the roller, while performing a stop control to stop the roller at a designated stop position. The stop control is performed after the motor is rotated in a direction opposite to a direction of feed of the sheet.Type: ApplicationFiled: October 29, 2015Publication date: May 19, 2016Applicant: RICOH COMPANY, LTD.Inventor: Eiki YOSHIMIZU
-
Publication number: 20150360892Abstract: A separation conveyance device comprises: a separation unit that includes a first roller feeding a conveyance object, and a load unit applying a load to the fed conveyance object, and separates one conveyance object from conveyance objects; a second roller that conveys the fed conveyance object; a driving unit that causes a motor to rotate the first roller at a first linear speed and the second roller at a second linear speed higher than the first linear speed; a connection unit that cuts off the motor's power from the first roller when first load torque toward a rotation direction of the first roller is equal to or larger than a certain value; a detection unit that detects second load torque in the direction opposite to a rotation direction of the motor; and a determination unit that determines a separation state of the conveyance object based on the second load torque.Type: ApplicationFiled: June 8, 2015Publication date: December 17, 2015Applicant: RICOH COMPANY, LIMITEDInventor: Eiki YOSHIMIZU
-
Publication number: 20100149299Abstract: An inkjet recording apparatus provides an improved printing speed and improved convenience of use. A recording head discharges droplets of a recording liquid onto a paper so as to form an image on the paper. A belt conveyance mechanism has a belt onto which the paper is electrostatically attached. The paper attached onto the belt is conveyed in a direction perpendicular to a carding direction of the paper.Type: ApplicationFiled: February 23, 2010Publication date: June 17, 2010Inventors: Hajime NISHIDA, Manabu Nonaka, Eiki Yoshimizu, Shinichiro Naruse, Yasuhiro Kawashima, Hideki Sueoka, Tetsu Morino, Kazumasa Ishikawa, Yasunobu Youda, Akihiro Fujita, Shoji Asanuma, Masatoshi Sakakitani, Taku Kudoh, Shigeyuki Ito, Yohzoh Dohki, Koji Watanabe
-
Patent number: 7712739Abstract: A recording paper conveying apparatus is disclosed. The recording paper conveying apparatus includes a conveying part for conveying a recording paper, the conveying part including a first encoder, and a driving part for driving the conveying part, the driving part including a second encoder, wherein the first and second encoders have different resolutions.Type: GrantFiled: May 3, 2005Date of Patent: May 11, 2010Assignee: Ricoh Company, Ltd.Inventor: Eiki Yoshimizu
-
Patent number: 7712892Abstract: An inkjet recording apparatus provides an improved printing speed and improved convenience of use. A recording head discharges droplets of a recording liquid onto a paper so as to form an image on the paper. A belt conveyance mechanism has a belt onto which the paper is electrostatically attached. The paper attached onto the belt is conveyed in a direction perpendicular to a carding direction of the paper.Type: GrantFiled: March 2, 2005Date of Patent: May 11, 2010Assignee: Ricoh Company, Ltd.Inventors: Hajime Nishida, Manabu Nonaka, Eiki Yoshimizu, Shinichiro Naruse, Yasuhiro Kawashima, Hideki Sueoka, Tetsu Morino, Kazumasa Ishikawa, Yasunobu Youda, Akihiro Fujita, Shoji Asanuma, Masatoshi Sakakitani, Taku Kudoh, Shigeyuki Ito, Yohzoh Dohki, Koji Watanabe
-
Patent number: 7505714Abstract: In an image forming device comprising an image forming part forming an image on a recording sheet, a sheet ejection part provided above the image forming part and stacking the recording sheet on which the image is formed by the image forming part, and an image reading part provided above the sheet ejection part and reading an image of an original document, the sheet ejection part is provided with a cover which is capable of being opened or closed to the sheet ejection part.Type: GrantFiled: May 25, 2005Date of Patent: March 17, 2009Assignee: Ricoh Company, Ltd.Inventors: Shoji Asanuma, Shuji Tanaka, Manabu Nonaka, Kazumasa Ishikawa, Taku Kudoh, Hajime Nishida, Akihiro Fujita, Yasuhiro Kawashima, Kenji Kameyama, Yasunobu Youda, Eiki Yoshimizu, Shinichiro Naruse, Yohzoh Dohki, Shigeyuki Ito
-
Patent number: 7431422Abstract: A head cleaner is disclosed that includes a blade that has a top face and wipes the nozzle face of a liquid droplet ejecting head that ejects liquid droplets from nozzles, and a cleaning part that cleans the top face of the blade.Type: GrantFiled: December 13, 2004Date of Patent: October 7, 2008Assignee: Ricoh Company, Ltd.Inventors: Shoji Asanuma, Manabu Nonaka, Hajime Nishida, Akihiro Fujita, Eiki Yoshimizu, Shinichiro Naruse, Yasuhiro Kawashima, Taku Kudoh, Kazumasa Ishikawa, Yohzoh Dohki, Shigeyuki Ito
-
Publication number: 20050265749Abstract: In an image forming device comprising an image forming part forming an image on a recording sheet, a sheet ejection part provided above the image forming part and stacking the recording sheet on which the image is formed by the image forming part, and an image reading part provided above the sheet ejection part and reading an image of an original document, the sheet ejection part is provided with a cover which is capable of being opened or closed to the sheet ejection part.Type: ApplicationFiled: May 25, 2005Publication date: December 1, 2005Inventors: Shoji Asanuma, Shuji Tanaka, Manabu Nonaka, Kazumasa Ishikawa, Taku Kudoh, Hajime Nishida, Akihiro Fujita, Yasuhiro Kawashima, Kenji Kameyama, Yasunobu Youda, Eiki Yoshimizu, Shinichiro Naruse, Yohzoh Dohki, Shigeyuki Ito
-
Publication number: 20050253920Abstract: A recording paper conveying apparatus is disclosed. The recording paper conveying apparatus includes a conveying part for conveying a recording paper, the conveying part including a first encoder, and a driving part for driving the conveying part, the driving part including a second encoder, wherein the first and second encoders have different resolutions.Type: ApplicationFiled: May 3, 2005Publication date: November 17, 2005Inventor: Eiki Yoshimizu
-
Publication number: 20050194730Abstract: An inkjet recording apparatus provides an improved printing speed and improved convenience of use. A recording head discharges droplets of a recording liquid onto a paper so as to form an image on the paper. A belt conveyance mechanism has a belt onto which the paper is electrostatically attached. The paper attached onto the belt is conveyed in a direction perpendicular to a carding direction of the paper.Type: ApplicationFiled: March 2, 2005Publication date: September 8, 2005Inventors: Hajime Nishida, Manabu Nonaka, Eiki Yoshimizu, Shinichiro Naruse, Yasuhiro Kawashima, Hideki Sueoka, Tetsu Morino, Kazumasa Ishikawa, Yasunobu Youda, Akihiro Fujita, Shoji Asanuma, Masatoshi Sakakitani, Taku Kudoh, Shigeyuki Ito, Yohzoh Dohki, Koji Watanabe
-
Publication number: 20050146554Abstract: A head cleaner is disclosed that includes a blade that has a top face and wipes the nozzle face of a liquid droplet ejecting head that ejects liquid droplets from nozzles, and a cleaning part that cleans the top face of the blade.Type: ApplicationFiled: December 13, 2004Publication date: July 7, 2005Inventors: Shoji Asanuma, Manabu Nonaka, Hajime Nishida, Akihiro Fujita, Eiki Yoshimizu, Shinichiro Naruse, Yasuhiro Kawashima, Taku Kudoh, Kazumasa Ishikawa, Yohzoh Dohki, Shigeyuki Ito