Patents by Inventor Tooru Miyajima
Tooru Miyajima 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: 8896821Abstract: To realize an encoder having highly reliable detection accuracy and capable of reducing a device cost. A light detection unit of an encoder receives light irradiated by a light source and transmitted through light-transmitting portions of Gray code optical patterns of a rotating disk and a light-transmitting/shielding member, and detects the light as digital data. A magnetic detection unit detects a magnetic pattern of a magnet provided on a rotation center portion of the rotating disk as digital data. A processing unit compares the digital data of the magnetic detection unit and the digital data of the light detection unit, and corrects a detection error.Type: GrantFiled: March 18, 2013Date of Patent: November 25, 2014Assignee: Sanyo Denki Co., Ltd.Inventors: Tooru Miyajima, Yoshi Ishizuka, Shoji Ito
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Patent number: 8878125Abstract: Provided herein is an encoder including a position detecting device provided with a gear mechanism and an optical encoder device. A housing includes a bearing holder provided between a first housing portion and a second housing portion of the housing. The bearing holder serves as a partition wall portion configured to separate the gear mechanism from the optical encoder device. If the gear mechanism is separated from the optical encoder device, abrasion powder or grease can be reliably prevented from scattering from the gear mechanism to adhere to constituent parts of the optical encoder device.Type: GrantFiled: July 13, 2012Date of Patent: November 4, 2014Assignee: Sanyo Denki Co., Ltd.Inventors: Tooru Miyajima, Toshiaki Ayuzawa, Yoshihiro Shoji
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Publication number: 20130242289Abstract: To realize an encoder having highly reliable detection accuracy and capable of reducing a device cost. A light detection unit of an encoder receives light irradiated by a light source and transmitted through light-transmitting portions of Gray code optical patterns of a rotating disk and a light-transmitting/shielding member, and detects the light as digital data. A magnetic detection unit detects a magnetic pattern of a magnet provided on a rotation center portion of the rotating disk as digital data. A processing unit compares the digital data of the magnetic detection unit and the digital data of the light detection unit, and corrects a detection error.Type: ApplicationFiled: March 18, 2013Publication date: September 19, 2013Applicant: Sanyo Denki Co., Ltd.Inventors: Tooru Miyajima, Yoshi Ishizuka, Shoji Ito
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Patent number: 8526013Abstract: A batteryless absolute encoder determines the accuracy of absolute position information to be output when electric power is turned on and outputs an alarm signal in the case of abnormality. The batteryless absolute encoder includes an absolute position computing section, an absolute position storing section, and a determining section. The absolute position computing section computes the absolute position of a spindle to be detected, including the number of revolutions of the spindle, based upon detection signals output from four reluctance resolvers. The absolute position storing section stores the absolute position output from the absolute position computing section when electric power is turned off. The determining section compares an absolute position output from the absolute position computing section when electric power is turned on and the stored absolute position and outputs an alarm signal if a difference between the two absolute positions is larger than a predetermined value.Type: GrantFiled: March 16, 2009Date of Patent: September 3, 2013Assignee: Sanyo Denki Co., Ltd.Inventors: Kazuhiro Makiuchi, Tomohito Yamazaki, Tooru Miyajima, Shigeharu Katou, Toshiaki Ayuzawa
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Patent number: 8358124Abstract: A magnetic absolute encoder with enhanced resolution is provided. A first cycle determining section 27 utilizes data stored in a fourth angle data storing section 23 to determine in which cycle of m cycles of the fourth angle data, fifth angle data, which has been newly computed in response to rotation of a rotary shaft 1, occurs. A second cycle determining section 29 determines in which cycle of n cycles of first angle data that occur in first determined cycle, the newly computed fifth angle data occurs. A third cycle determining section 31 determines in which cycle of N1 cycles of the first angle data, the current first angle data occurs, based on the first determined cycle and second determined cycle. An absolute position determining section 33 determines the absolute position based on third determined cycle and the digital value of the current first angle data.Type: GrantFiled: November 17, 2010Date of Patent: January 22, 2013Assignee: Sayno Denki Co., Ltd.Inventors: Shigeharu Katou, Kazuhiro Makiuchi, Shoji Ito, Tooru Miyajima, Tomohito Yamazaki, Toshiaki Ayuzawa, Masato Matsuda
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Publication number: 20130015333Abstract: Provided herein is an encoder including a position detecting device provided with a gear mechanism and an optical encoder device. A housing includes a bearing holder provided between a first housing portion and a second housing portion of the housing. The bearing holder serves as a partition wall portion configured to separate the gear mechanism from the optical encoder device. If the gear mechanism is separated from the optical encoder device, abrasion powder or grease can be reliably prevented from scattering from the gear mechanism to adhere to constituent parts of the optical encoder device.Type: ApplicationFiled: July 13, 2012Publication date: January 17, 2013Applicant: SANYO DENKI CO., LTD.Inventors: Tooru Miyajima, Toshiaki Ayuzawa, Yoshihiro Shoji
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Publication number: 20110115481Abstract: A magnetic absolute encoder with enhanced resolution is provided. A first cycle determining section 27 utilizes data stored in a fourth angle data storing section 23 to determine in which cycle of m cycles of the fourth angle data, fifth angle data, which has been newly computed in response to rotation of a rotary shaft 1, occurs. A second cycle determining section 29 determines in which cycle of n cycles of first angle data that occur in first determined cycle, the newly computed fifth angle data occurs. A third cycle determining section 31 determines in which cycle of N1 cycles of the first angle data, the current first angle data occurs, based on the first determined cycle and second determined cycle. An absolute position determining section 33 determines the absolute position based on third determined cycle and the digital value of the current first angle data.Type: ApplicationFiled: November 17, 2010Publication date: May 19, 2011Applicant: SANYO DENKI CO., LTD.Inventors: Shigeharu Katou, Kazuhiro Makiuchi, Shoji Ito, Tooru Miyajima, Tomohito Yamazaki, Toshiaki Ayuzawa, Masato Matsuda
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Publication number: 20110026040Abstract: A batteryless absolute encoder determines the accuracy of absolute position information to be output when electric power is turned on and outputs an alarm signal in the case of abnormality. The batteryless absolute encoder includes an absolute position computing section, an absolute position storing section, and a determining section. The absolute position computing section computes the absolute position of a spindle to be detected, including the number of revolutions of the spindle, on the basis of detection signals output from four reluctance resolvers. The absolute position storing section stores the absolute position output from the absolute position computing section when electric power is turned off. The determining section compares an absolute position output from the absolute position computing section when electric power is turned on and the stored absolute position and outputs an alarm signal if a difference between the two absolute positions is larger than a predetermined value.Type: ApplicationFiled: March 16, 2009Publication date: February 3, 2011Applicant: SANYO DENKI CO., LTD.Inventors: Kazuhiro Makiuchi, Tomohito Yamazaki, Tooru Miyajima, Shigeharu Katou, Toshiaki Ayuzawa
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Patent number: 5070133Abstract: The present invention relates to a high water-absorptive resin emulsion in which fine particles of an ionic resin having a low crosslinking density are dispersed in an oil, and the above emulsion can be prepared by a reversed phase emulsion polymerization of ionic water-soluble monomers in the oil.Type: GrantFiled: June 20, 1990Date of Patent: December 3, 1991Assignee: Kyoritsu Yuki Co., Ltd.Inventor: Tooru Miyajima