Patents by Inventor Tomokazu Nakamura
Tomokazu Nakamura 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: 6741002Abstract: A motor includes a rotor with interior permanent magnets and a stator with teeth wound by concentrated windings. Each permanent magnet is split along a plane oriented towards the stator, and an electrically insulating section is set between the split magnet pieces. This structure allows each permanent magnet to be electrically split, thereby restraining the production of an eddy current. As a result, heat-production is dampened thereby preventing heat demagnetization of the permanent magnets.Type: GrantFiled: December 7, 2001Date of Patent: May 25, 2004Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Noriyoshi Nishiyama, Tomokazu Nakamura, Yasufumi Ikkai, Masaki Ogushi, Yasuhiro Kondo
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Publication number: 20040066526Abstract: An inspection device having a reading portion for reading an image on a sheet having an image formed thereon, a storage portion for storing therein image data read by the reading portion, and a selecting portion for selecting one of a first mode for storing the image data read by the reading portion in the storage portion, and a second mode for judging whether the image data read by the reading portion is similar to the image data stored in the storage portion.Type: ApplicationFiled: July 2, 2003Publication date: April 8, 2004Applicant: Canon Kabushiki KaishaInventors: Masaaki Inoo, Tomokazu Nakamura, Yusuke Obuchi, Yoshiyuki Nakajima, Atsuteru Oikawa, Hitoshi Kato
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Patent number: 6704526Abstract: The image heating apparatus has a heating body, an endless belt moving in contact with the heating body, a pressing member forming a nip for nipping and conveying a recording material in cooperation with the endless belt, detecting device for optically detecting the mark portion of the endless belt, control device for controlling a driving speed of the endless belt, based on output of the detecting device, and an electroconductive cleaning member for cleaning the mark portion. In the image heating apparatus, the endless belt has a mark portion.Type: GrantFiled: March 21, 2002Date of Patent: March 9, 2004Assignee: Canon Kabushiki KaishaInventor: Tomokazu Nakamura
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Publication number: 20030235328Abstract: An image forming apparatus adapted to form an image on a sheet by an image forming portion, and thereafter detect the presence or absence of any abnormality of the sheet on which the image has been formed has an abnormality detecting device for detecting the abnormality of the sheet, an abnormal sheet containing portion for containing therein the sheet of which the abnormality has been detected by the abnormality detecting device, a normal sheet containing portion for temporarily containing therein a normal sheet of which the abnormality has not been detected by the abnormality detecting device, and a controlling portion for controlling the image forming portion so that the abnormal sheet of which the abnormality has been detected by the abnormality detecting device may be contained in the abnormal sheet containing portion, and that an image formed on the abnormal sheet may be formed on a predetermined subsequent sheet subsequent to the abnormal sheet.Type: ApplicationFiled: May 29, 2003Publication date: December 25, 2003Applicant: CANON KABUSHIKI KAISHA, TOKYO, JAPANInventors: Tomokazu Nakamura, Masaaki Inoo, Shinsuke Ubayashi, Yusuke Obuchi, Yoshiyuki Nakajima, Atsuteru Oikawa, Hitoshi Kato
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Publication number: 20020141773Abstract: The image heating apparatus has a heating body, an endless belt moving in contact with the heating body, a pressing member forming a nip for nipping and conveying a recording material in cooperation with the endless belt, detecting device for optically detecting the mark portion of the endless belt, control device for controlling a driving speed of the endless belt, based on output of the detecting device, and an electroconductive cleaning member for cleaning the mark portion. In the image heating apparatus, the endless belt has a mark portion.Type: ApplicationFiled: March 21, 2002Publication date: October 3, 2002Applicant: Canon Kabushiki KaishaInventor: Tomokazu Nakamura
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Publication number: 20020070619Abstract: The invention relates to a motor comprising a stator core having plural teeth and slots provided among the teeth, a winding applied on the teeth by a single turn, and a rotor incorporating plural permanent magnets, which is rotated and driven by utilizing reluctance torque in addition to magnet torque. By turning thus divided teeth by a single winding, the occupation rate of the winding in the slots can be raised. As a result, a motor of small size and large output can be presented.Type: ApplicationFiled: November 28, 2001Publication date: June 13, 2002Inventors: Noriyoshi Nishiyama, Tomokazu Nakamura, Yasufumi Ikkai, Yukio Honda, Hiroshi Murakami, Shinichiro Kawano
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Publication number: 20020041128Abstract: A motor includes a rotor with interior permanent magnets and a stator with teeth wound by concentrated windings. Each permanent magnet is split along a plane oriented towards the stator, and an electrically insulating section is set between the split magnet pieces. This structure allows each permanent magnet to be electrically split, thereby restraining the production of an eddy current. As a result, heat-production is dampened thereby preventing heat demagnetization of the permanent magnets.Type: ApplicationFiled: December 7, 2001Publication date: April 11, 2002Inventors: Noriyoshi Nishiyama, Tomokazu Nakamura, Yasufumi Ikkai, Masaki Ogushi, Yasuhiro Kondo
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Patent number: 6369480Abstract: The invention relates to a motor comprising a stator core having plural teeth and slots provided among the teeth, a winding applied on the teeth by a single turn, and a rotor incorporating plural permanent magnets, which is rotated and driven by utilizing reluctance torque in addition to magnet torque. By turning thus divided teeth by a single winding, the occupation rate of the winding in the slots can be raised. As a result, a motor of small size and large output can be presented.Type: GrantFiled: April 6, 2000Date of Patent: April 9, 2002Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Noriyoshi Nishiyama, Tomokazu Nakamura, Yasufumi Ikkai, Yukio Honda, Hiroshi Murakami, Shinichiro Kawano
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Publication number: 20020036438Abstract: The invention relates to a motor comprising a stator core having plural teeth and slots provided among the teeth, a winding applied on the teeth by a single turn, and a rotor incorporating plural permanent magnets, which is rotated and driven by utilizing reluctance torque in addition to magnet torque. By turning thus divided teeth by a single winding, the occupation rate of the winding in the slots can be raised. As a result, a motor of small size and large output can be presented.Type: ApplicationFiled: November 28, 2001Publication date: March 28, 2002Inventors: Noriyoshi Nishiyama, Tomokazu Nakamura, Yasufumi Ikkai, Yukio Honda, Hiroshi Murakami, Shinichiro Kawano
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Patent number: 6356001Abstract: The invention relates to a motor comprising a stator core having plural teeth and slots provided among the teeth, a winding applied on the teeth by a single turn, and a rotor incorporating plural permanent magnets, which is rotated and driven by utilizing reluctance torque in addition to magnet torque. By turning thus divided teeth by a single winding, the occupation rate of the winding in the slots can be raised. As a result, a motor of small size and large output can be presented.Type: GrantFiled: April 6, 2000Date of Patent: March 12, 2002Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Noriyoshi Nishiyama, Tomokazu Nakamura, Yasufumi Ikkai, Yukio Honda, Hiroshi Murakami, Shinichiro Kawano
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Patent number: 6353275Abstract: A motor including a stator which has a plurality of teeth provided with windings on each of the teeth and a rotor which has permanent magnets inside the rotor, then the rotor includes a rotating shaft disposed at the center part, a rotor core fixed to the rotating shaft, permanent magnet slits formed inside the outer rim of the rotor core, grooves formed at the walls of the magnet slits, and the magnets inserted into the magnet slits. Then adhesive layers are formed in the magnet slits for sticking the magnets to the rotor core. In this structure, even if the size of the magnet slits and size of the magnet sections are substantially same, the adhesive remains at the grooves, so that the magnets are surely stuck to the rotor core. Also, by forming the grooves at the outer rotor rim side corners of the magnet slits, the magnetic flux short circuit of the magnets themselves and the possible travels of the magnetic flux into the adjacent magnets are suppressed.Type: GrantFiled: October 13, 1998Date of Patent: March 5, 2002Inventors: Noriyoshi Nishiyama, Tomokazu Nakamura
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Patent number: 6344557Abstract: The present invention provides a method for producing &egr;-caprolactam which comprises the step of treating, with water, a reaction product containing 1-aza-2-alkoxy-1-cycloheptene, which is obtained by gas phase Beckmann rearrangement reaction of cyclohexanone oxime using a solid catalyst in the presence of alcohol, to eliminate the 1-aza-2-alkoxy-1-cycloheptene. The resulting &egr;-caprolactam usually has a 1-aza-2-alkoxy-1-cycloheptene content of 100 ppm or less, preferably 25 ppm or less, more preferably 10 ppm or less and, therefore, has low free basicity and good qualities.Type: GrantFiled: October 27, 2000Date of Patent: February 5, 2002Assignee: Sumitomo Chemical Company, LimitedInventors: Masami Fukao, Kan Takamine, Tomokazu Nakamura
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Patent number: 6340857Abstract: A motor includes a rotor with interior permanent magnets and a stator with teeth wound by concentrated windings. Each permanent magnet is split along a plane oriented towards the stator, and an electrically insulating section is set between the spilt magnet pieces. This structure allows each permanent magnet to be electrically split, thereby restraining the production of an eddy current. As a result, heat-production is dampened thereby preventing heat demagnetization of the permanent magnets.Type: GrantFiled: December 23, 1999Date of Patent: January 22, 2002Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Noriyoshi Nishiyama, Tomokazu Nakamura, Yasufumi Ikkai, Masaki Ogushi, Yasuhiro Kondo
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Publication number: 20010043020Abstract: A motor includes a rotor with interior permanent magnets and a stator with teeth wound by concentrated windings. The permanent magnet is split along a plane oriented to the stator, and an electrically insulating section is set between the spilt magnet pieces. This structure allows the permanent magnet to be electrically split thereby restraining the production of eddy current. As a result, heat-production is damped thereby preventing heat demagnetization of the permanent magnet.Type: ApplicationFiled: December 23, 1999Publication date: November 22, 2001Inventors: NORIYOSHI NISHIYAMA, TOMOKAZU NAKAMURA, YASUFUMI IKKAI, MASAKI OGUSHI, YASUHIRO KONDO
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Patent number: 6300700Abstract: A motor comprises a stator core having plural teeth and slots provided among the teeth, a winding applied on the teeth by a turn, and a rotor incorporating plural permanent magnets. The rotor is rotated and driven by utilizing reluctance torque in addition to magnetic torque. Since the winding is not crossed, the size of the coil end is reduced.Type: GrantFiled: March 21, 2000Date of Patent: October 9, 2001Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Noriyoshi Nishiyama, Tomokazu Nakamura, Yasufumi Ikkai, Yukio Honda, Hiroshi Murakami, Shinichiro Kawano
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Patent number: 6104117Abstract: In the permanent magnet motor of the present invention, where P is an integer not smaller than one, the number of magnetic poles of a rotor (22) is set to 2P, and the number of salient poles of a stator field core (21) is set to 3P. The salient pole section (21a) of each stator field core (21) is provided with two supplemental grooves (24). A salient pole magnetic interpolar angle is 4.theta., such that two supplemental grooves (24) of each salient pole section (21a) are arranged in positions at angles of .theta. and 3.theta. with respect to the center of a winding slot (27) in the circumferential direction of the rotor. With this structure, a fundamental wave component of a clogging torque is removed and a permanent magnet motor having a low clogging torque is provided.Type: GrantFiled: February 25, 1998Date of Patent: August 15, 2000Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Tomokazu Nakamura, Ichiro Masago, Koichi Uchida
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Patent number: 6049153Abstract: A motor comprises a stator core having plural teeth and slots provided among the teeth, a winding applied on the teeth by a turn, and a rotor incorporating plural permanent magnets. The rotor is rotated and driven by utilizing reluctance torque in addition to magnetic torque. Since the winding is not crossed, the size of the coil end is reduced.Type: GrantFiled: February 2, 1998Date of Patent: April 11, 2000Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Noriyoshi Nishiyama, Tomokazu Nakamura, Yasufumi Ikkai, Yukio Honda, Hiroshi Murakami, Shinichiro Kawano
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Patent number: 5962999Abstract: Torque ripples of a motor having interior permanent magnets can be reduced through the following method and the torque ripple controller using the same method: first, drive the motor having a plurality of phase windings and interior permanent magnets with a basic current supply circuit which outputs a basic current having a predetermined waveform, then store torque ripple waves produced in the running motor or obtained through a numerical analysis into a torque-ripple-wave-memory, next, compensate the torque ripple wave tapped off from the memory according to a prepared torque ripple compensation pattern and transform it to a torque compensation waveform with a torque-compensation-waveform-producing-circuit, further, multiply the torque compensation waveform tapped off from the waveform producing circuit by the basic current with a multiplier to output a torque ripple control current, and, supply the torque ripple control current to the plurality of phase windings shifting a phase by a predetermined electricaType: GrantFiled: July 29, 1998Date of Patent: October 5, 1999Assignee: Matsushita Electric IndustrialInventors: Tomokazu Nakamura, Noriyoshi Nishiyama, Yasufumi Ikkai
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Patent number: 5502184Abstract: The invention provides a process for producing high quality .epsilon.-caprolactam which comprises allowing crude .epsilon.-caprolactam obtained by gas phase Beckmann rearrangement of cyclohexanone oxime to contact with hydrogen at 100.degree.-200.degree. C. in the presence of a hydrogenation catalyst.Type: GrantFiled: August 19, 1994Date of Patent: March 26, 1996Assignee: Sumitomo Chemical Company, LimitedInventors: Hiroshi Kajikuri, Hideto Tojima, Tomokazu Nakamura, Masaru Kitamura
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Patent number: 5331381Abstract: A replenishing device for replenishing toner to a developing device for developing electrostatic latent images includes a hopper, and a toner conveying screw disposed in the hopper along a bottom surface of the hopper. The bottom surface consists of an inclined surface that rises in a downstream direction relative to the direction in which the screw conveys toner, so that an interior height dimension of the hopper at an end portion that is located upstream in the toner conveyance direction is greater than an interior height dimension at an end portion that is located downstream in the toner conveyance direction.Type: GrantFiled: May 25, 1993Date of Patent: July 19, 1994Assignee: Canon Kabushiki KaishaInventors: Hiroshi Ota, Tomokazu Nakamura