Patents by Inventor Masayoshi Ishii
Masayoshi Ishii 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: 7090956Abstract: In an image forming method, when viewed from the moving direction of a photosensitive body 1, there is disposed, on the upstream side, a first developing roller 61 opposed to and adjacent to the photosensitive body 1 and rotatable in the opposite direction to the photosensitive body 1, while the peripheral speed ratio of the roller 61 to the photosensitive body 1 ranges from 0.8 to 2.0; on the downstream side of the roller 61, there is disposed a second developing roller 62 rotatable in the same direction to the photosensitive body 1, while the peripheral speed ratio of the roller 62 to the photosensitive body 1 ranges from 1.05 to 2.0; and the shape coefficient SF1 of the toners of two-component developing agent ranges from 120 to 170, while the shape coefficient SF2 ranges from 110 to 130.Type: GrantFiled: December 26, 2001Date of Patent: August 15, 2006Assignee: Ricoh Printing Systems, Ltd.Inventors: Katsuhiko Suzuki, Masami Ishikawa, Tsuneaki Kawanishi, Teruaki Mitsuya, Hisao Okada, Masayoshi Ishii
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Patent number: 6995643Abstract: In order to provide an inductance part having excellent DC superposition characteristic and core-loss, a magnetically biasing magnet, which is disposed in a magnetic gap of a magnetic core, is a bond magnet comprising magnetic powder and plastic resin with the content of the resin being 20% or more on the base of volumetric ratio and which has a specific resistance of 0.1?·cm or more. The magnetic powder used is rare-earth magnetic powder having an intrinsic coercive force of 5 kOe or more, Curie point of 300° C. or more, and an average particle size of 2.0–50 ?m. A magnetically biasing magnet used in an inductance part that is treated by the reflow soldering method has a resin content of 30% or more and the magnetic powder used therein is Sm—Co magnetic powder having an intrinsic coercive force of 10 kOe or more, Curie point of 500° C. or more, and an average particle size of 2.5–50 ?m. A thin magnet having a thickness of 500 ?m or less can be realized for a small-sized inductance part.Type: GrantFiled: January 6, 2005Date of Patent: February 7, 2006Assignee: NEC Tokin CorporationInventors: Teruhiko Fujiwara, Masayoshi Ishii, Haruki Hoshi, Keita Isogai, Hatsuo Matsumoto, Toru Ito, Tamiko Ambo
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Patent number: 6906608Abstract: An inductor component according to the present invention includes a magnetic core including at least one magnetic gap having a gap length of about 50 to 10,000 ?m in a magnetic path, a magnet for magnetic bias arranged in the neighborhood of the magnetic gap in order to supply magnetic bias from both sides of the magnetic gap, and a coil having at least one turn applied to the magnetic core. The aforementioned magnet for magnetic bias is a bonded magnet containing a resin and a magnet powder dispersed in the resin and having a resistivity of 1 ?·cm or more. The magnet powder includes a rare-earth magnet powder having an intrinsic coercive force of 5 KOe or more, a Curie point of 300° C. or more, the maximum particle diameter of 150 ?m or less, and an average particle diameter of 2.0 to 50 ?m m and coated with inorganic glass, and the rare-earth magnet powder is selected from the group consisting of a Sm—Co magnet powder, Nd—Fe—B magnet powder, and Sm—Fe—N magnet powder.Type: GrantFiled: May 11, 2004Date of Patent: June 14, 2005Assignee: NEC TOKIN CorporationInventors: Teruhiko Fujiwara, Masayoshi Ishii, Haruki Hoshi, Keita Isogai, Toru Ito, Tamiko Ambo
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Publication number: 20050116804Abstract: In order to provide an inductance part having excellent DC superposition characteristic and core-loss, a magnetically biasing magnet, which is disposed in a magnetic gap of a magnetic core, is a bond magnet comprising magnetic powder and plastic resin with the content of the resin being 20% or more on the base of volumetric ratio and which has a specific resistance of 0.1 ?·cm or more. The magnetic powder used is rare-earth magnetic powder having an intrinsic coercive force of 5 kOe or more, Curie point of 300° C. or more, and an average particle size of 2.0-50 ?m. A magnetically biasing magnet used in an inductance part that is treated by the reflow soldering method has a resin content of 30% or more and the magnetic powder used therein is Sm—Co magnetic powder having an intrinsic coercive force of 10 kOe or more, Curie point of 500° C. or more, and an average particle size of 2.5-50 ?m. A thin magnet having a thickness of 500 ?m or less can be realized for a small-sized inductance part.Type: ApplicationFiled: January 6, 2005Publication date: June 2, 2005Applicant: NEC Tokin CorporationInventors: Teruhiko Fujiwara, Masayoshi Ishii, Haruki Hoshi, Keita Isogai, Hatsuo Matsumoto, Toru Ito, Tamiko Ambo
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Patent number: 6879800Abstract: A position where a transport amount regulation member is opposed to a developing roller is in an area wherein the magnetic flux density in the tangent line direction becomes 95% or less of the maximum value upstream in the developer transport direction from the position at which the magnetic flux density in the normal direction formed by two magnetic poles on both sides of the transport amount regulation member on the sleeve roller surface of the developing roller becomes 0 gausses and is in an area wherein the magnetic flux density in the normal direction becomes 90% or less of the maximum value of the upstream pole in the developer transport direction.Type: GrantFiled: December 18, 2002Date of Patent: April 12, 2005Assignee: Ricoh Printing Systems, Ltd.Inventors: Hiroyuki Mabuchi, Masayoshi Ishii
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Patent number: 6856231Abstract: In order to provide an inductance part having excellent DC superposition characteristic and core-loss, a magnetically biasing magnet, which is disposed in a magnetic gap of a magnetic core, is a bond magnet comprising magnetic powder and plastic resin with the content of the resin being 20% or more on the base of volumetric ratio and which has a specific resistance of 0.1?•cm or more. The magnetic powder used is rare-earth magnetic powder having an intrinsic coercive force of 5 kOe or more, Curie point of 300° C. or more, and an average particle size of 2.0-50 ?m. A magnetically biasing magnet used in an inductance part that is treated by the reflow soldering method has a resin content of 30% or more and the magnetic powder used therein is Sm—Co magnetic powder having an intrinsic coercive force of 10 kOe or more, Curie point of 500° C. or more, and an average particle size of 2.5-50 ?m. A thin magnet having a thickness of 500 ?m or less can be realized for a small-sized inductance part.Type: GrantFiled: September 10, 2001Date of Patent: February 15, 2005Assignee: NEC Tokin CorporatonInventors: Teruhiko Fujiwara, Masayoshi Ishii, Haruki Hoshi, Keita Isogai, Hatsuo Matsumoto, Toru Ito, Tamiko Ambo
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Patent number: 6829449Abstract: A transfer member transporting section is disposed so as to bring a tip end of a transfer member into contact with a peripheral face of a transfer rotary member before the tip end of the transfer member enters a nip area. A bias power supply has a polarity inverting function of, during a period from a timing when the tip end of the transfer member is brought into contact with the transfer rotary member by the transfer member transporting section, to that when the tip end of the transfer member enters the nip area, applying a voltage of a polarity which is identical with that of a toner, to the transfer rotary member, and after the tip end of the transfer member enters the nip area, applying a voltage of a polarity which is opposite to that of the toner, to the transfer rotary member.Type: GrantFiled: May 30, 2003Date of Patent: December 7, 2004Assignee: Hitachi Printing Solutions, Ltd.Inventors: Hiroyoshi Matsumoto, Teruaki Mitsuya, Tsuneaki Kawanishi, Hisao Okada, Natsuki Kuribayashi, Masayoshi Ishii, Keisuke Kubota
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Patent number: 6813462Abstract: A developing unit in an electro-photographic apparatus such as a printer, a facsimile and a copier for actualizing an image employing colored particles such as toner, and more particularly to a developing unit for forming a toner image on the surface of a photosensitive body. The developing unit includes a plurality of developing rollers each having a core and a sleeve. The sleeve accommodates the core. The plurality of developing rollers include a first developing roller and a second developing roller. The sleeve for the first developing roller is rotated to move in the same direction as a moving direction of the surface of the photosensitive body. The sleeve for the second developing roller is rotated to move in an opposite direction to the moving direction of the surface of the photosensitive body. The core of only one of the plurality of developing rollers is driven in rotation while the other core is fixed.Type: GrantFiled: January 27, 2003Date of Patent: November 2, 2004Assignee: Hitachi Printing Solutions, Ltd.Inventors: Teruaki Mitsuya, Tsuneaki Kawanishi, Masayoshi Ishii, Hisao Okada, Hiroyoshi Matsumoto, Keisuke Kubota, Natsuki Kuribayashi
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Publication number: 20040207500Abstract: An inductor component according to the present invention includes a magnetic core including at least one magnetic gap having a gap length of about 50 to 10,000 &mgr;m in a magnetic path, a magnet for magnetic bias arranged in the neighborhood of the magnetic gap in order to supply magnetic bias from both sides of the magnetic gap, and a coil having at least one turn applied to the magnetic core. The aforementioned magnet for magnetic bias is a bonded magnet containing a resin and a magnet powder dispersed in the resin and having a resistivity of 1 &OHgr;·cm or more. The magnet powder includes a rare-earth magnet powder having an intrinsic coercive force of 5 KOe or more, a Curie point of 300° C. or more, the maximum particle diameter of 150 &mgr;m or less, and an average particle diameter of 2.Type: ApplicationFiled: May 11, 2004Publication date: October 21, 2004Applicant: NEC TOKIN CORPORATIONInventors: Teruhiko Fujiwara, Masayoshi Ishii, Haruki Hoshi, Keita Isogai, Toru Ito, Tamiko Ambo
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Patent number: 6792235Abstract: A transfer flow-in current which flows from a transferring device into an image carrier, a separation flow-in current which flows from a separating device into the image carrier, an aperture width in the recording member transporting direction of an aperture of the transferring device, and an aperture width in the recording member transporting direction of an aperture of the separating device are set so as to have the relationship: separation flow-in current=transfer flow-in current×(transfer aperture width/separation aperture width).Type: GrantFiled: July 8, 2002Date of Patent: September 14, 2004Assignee: Hitachi Printing Solutions, Ltd.Inventors: Keisuke Kubota, Masayoshi Ishii, Teruaki Mitsuya, Hideki Ando
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Patent number: 6788185Abstract: A powder core is obtained by compaction-forming magnetic powder. The magnetic powder is an alloy comprising 1-10 wt % Si, 0.1-1.0 wt % O, and balance Fe. An insulator comprising SiO2 and MgO as main components is interposed between powder particles having a particle size of 150 &mgr;m or less.Type: GrantFiled: July 29, 2003Date of Patent: September 7, 2004Assignee: NEC Tokin CorporationInventors: Teruhiko Fujiwara, Masayoshi Ishii, Yoshitaka Saito
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Publication number: 20040168303Abstract: An inductor component contains a drum magnetic core made of a magnetic material having a structure including integrated flanges at both ends of a columnar material, a coil wound around the columnar material in the drum magnetic core and placed between the flanges, and a permanent magnet placed in the neighborhood of the drum magnetic core with the coil wound around. This inductor component contains a sleeve core fitted to the outside of the drum magnetic core. The permanent magnet is placed in at least one gap in a closed magnetic circuit formed with the drum magnetic core and the sleeve core in order to apply a direct-current magnetic field in the direction opposite to the direction of a magnetic field generated by a magnetomotive force due to the coil.Type: ApplicationFiled: March 1, 2004Publication date: September 2, 2004Applicant: NEC TOKIN CORPORATIONInventors: Hatsuo Matsumoto, Toru Ito, Masahiro Kondo, Ryutaro Isoda, Toshiya Sato, Tadakuni Sato, Teruhiko Fujiwara, Masayoshi Ishii, Haruki Hoshi
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Patent number: 6760553Abstract: An electrophotographic cluster printing system for performing printing by using a plurality of electrophotographic recording apparatuses such as printers, facsimile machines or copying machines each capable of manifesting an image by using colored particles such as toner. The electrophotographic cluster printing system includes a plurality of electrophotograhic recording apparatuses each including a photoconductor, a charger, an exposure device, a developing device, and an image quality controller for detecting a factor concerning image quality and controlling image quality of an output image on the basis of information of the detected factor. In the system, at least two of the electrophotograhic recording apparatuses is used for printing one job and image quality of any one of the electrophotograhic recording apparatuses is controlled on the basis of detected information of the other electrophotograhic recording apparatuses.Type: GrantFiled: December 27, 2002Date of Patent: July 6, 2004Assignees: Hitachi Printing Solutions, Ltd., Hitachi, Ltd.Inventors: Teruaki Mitsuya, Keisuke Kubota, Masayoshi Ishii, Shintaro Yamada
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Patent number: 6753751Abstract: An inductor component according to the present invention includes a magnetic core including at least one magnetic gap having a gap length of about 50 to 10,000 &mgr;m in a magnetic path, a magnet for magnetic bias arranged in the neighborhood of the magnetic gap in order to supply magnetic bias from both sides of the magnetic gap, and a coil having at least one turn applied to the magnetic core. The aforementioned magnet for magnetic bias is a bonded magnet containing a resin and a magnet powder dispersed in the resin and having a resistivity of 1 &OHgr;·cm or more. The magnet powder includes a rare-earth magnet powder having an intrinsic coercive force of 5 KOe or more, a Curie point of 300° C. or more, the maximum particle diameter of 150 &mgr;m or less, and an average particle diameter of 2.Type: GrantFiled: November 29, 2001Date of Patent: June 22, 2004Assignee: NEC Tokin CorporationInventors: Teruhiko Fujiwara, Masayoshi Ishii, Haruki Hoshi, Keita Isogai, Toru Ito, Tamiko Ambo
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Patent number: 6738586Abstract: A print control method of an electrophotograph in an image formation apparatus including at least a photoconductor, a charger, a light exposure unit, and a developing device for forming a background area and an image area on the photoconductor using the charger and the light exposure unit and detecting a potential of the image area after transfer and controlling a developing electric field, thereby printing an electrophotograph, includes lowering the percentage of toner covering the image area on the photoconductor when the potential is detected.Type: GrantFiled: February 8, 2002Date of Patent: May 18, 2004Assignee: Hitachi Printing Solutions, Ltd.Inventors: Keisuke Kubota, Teruaki Mitsuya, Hiroyuki Mabuchi, Masayoshi Ishii, Shinichi Akatsu
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Patent number: 6717504Abstract: A low-profile magnetic core capable of reducing the thickness of an inductor component is provided. The magnetic core includes at least one gap in a magnetic path, and a permanent magnet is inserted in the gap. The magnetic core has an alternating current magnetic permeability at 20 kHz of 45 or more in a magnetic field of 120 Oe under application of direct current, and has a core loss characteristic of 100 kW/m3 or less under the conditions of 20 kHz and the maximum magnetic flux density of 0.1 T. An inductor component is produced by applying at least one turn of coil to the aforementioned magnetic core.Type: GrantFiled: October 24, 2001Date of Patent: April 6, 2004Assignee: NEC Tokin CorporationInventors: Teruhiko Fujiwara, Masayoshi Ishii, Haruki Hoshi, Keita Isogai, Toru Ito, Tamiko Ambo
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Patent number: 6710693Abstract: An inductor component contains a drum magnetic core made of a magnetic material having a structure including integrated flanges at both ends of a columnar material, a coil wound around the columnar material in the drum magnetic core and placed between the flanges, and a permanent magnet placed in the neighborhood of the drum magnetic core with the coil wound around. This inductor component contains a sleeve core fitted to the outside of the drum magnetic core. The permanent magnet is placed in at least one gap in a closed magnetic circuit formed with the drum magnetic core and the sleeve core in order to apply a direct-current magnetic field in the direction opposite to the direction of a magnetic field generated by a magnetomotive force due to the coil.Type: GrantFiled: March 22, 2002Date of Patent: March 23, 2004Assignee: NEC Tokin CorporationInventors: Hatsuo Matsumoto, Toru Ito, Masahiro Kondo, Ryutaro Isoda, Toshiya Sato, Tadakuni Sato, Teruhiko Fujiwara, Masayoshi Ishii, Haruki Hoshi
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Publication number: 20040052541Abstract: A transfer member transporting section is disposed so as to bring a tip end of a transfer member into contact with a peripheral face of a transfer rotary member before the tip end of the transfer member enters a nip area. A bias power supply has a polarity inverting function of, during a period from a timing when the tip end of the transfer member is brought into contact with the transfer rotary member by the transfer member transporting section, to that when the tip end of the transfer member enters the nip area, applying a voltage of a polarity which is identical with that of a toner, to the transfer rotary member, and after the tip end of the transfer member enters the nip area, applying a voltage of a polarity which is opposite to that of the toner, to the transfer rotary member.Type: ApplicationFiled: May 30, 2003Publication date: March 18, 2004Applicant: Hitachi Printing Solutions, Ltd.Inventors: Hiroyoshi Matsumoto, Teruaki Mitsuya, Tsuneaki Kawanishi, Hisao Okada, Natsuki Kuribayashi, Masayoshi Ishii, Keisuke Kubota
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Publication number: 20040021542Abstract: A powder core is obtained by compaction-forming magnetic powder. The magnetic powder is an alloy comprising 1-10 wt % Si, 0.1-1.0 wt % O, and balance Fe. An insulator comprising SiO2 and MgO as main components is interposed between powder particles having a particle size of 150 &mgr;m or less.Type: ApplicationFiled: July 29, 2003Publication date: February 5, 2004Applicant: NEC TOKIN CORPORATIONInventors: Teruhiko Fujiwara, Masayoshi Ishii, Yoshitaka Saito
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Patent number: 6686943Abstract: An image formation apparatus for keeping secularly stable image quality for all image patterns if change in the charge amount of a developer caused by environment variation or over time or change in the photoconductor characteristic occurs in electrophotographic record apparatus. A test patch image formed on a photoconductor by a parallel electric field is detected by an image density sensor, the developing bias and the photoconductor surface potential are controlled so that the density detected by the image density sensor becomes constant, a test patch image formed on the photoconductor by a peripheral electric field is detected by the image density sensor with the control condition of the image density sensor maintained, and the light application amount in which an image area of a several-dot width adjacent a blank paper part is exposed to light is controlled so that the density detected by the image density sensor becomes constant.Type: GrantFiled: July 12, 2002Date of Patent: February 3, 2004Assignees: Hitachi Printing Solutions, Ltd., Hitachi Ltd.Inventors: Masayoshi Ishii, Keisuke Kubota, Teruaki Mitsuya, Shintaro Yamada