Patents by Inventor Shinichi Suenaga
Shinichi Suenaga 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: 9248504Abstract: There are provided a copper powder for conductive paste, which comprises monodisperse and spherical fine copper particles having a sharp particle size distribution and containing no coarse particles and which can form a thinner electrode film while avoiding a bad influence on electric characteristics thereof, and a method for stably producing such a copper powder for conductive paste. After copper is complexed by adding a complexing agent to an aqueous solution containing copper while blowing air into the solution, the blowing of air is stopped, and then, a reducing agent is added to the solution to deposit copper particles by reduction.Type: GrantFiled: September 12, 2011Date of Patent: February 2, 2016Assignee: DOWA ELECTRONICS MATERIALS CO., LTD.Inventors: Yuki Kaneshiro, Shinichi Suenaga, Hidefumi Fujita, Minoru Kishida
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Patent number: 9211587Abstract: There are provided a cuprous oxide powder having a smaller particle diameter than that of conventional cuprous oxide powders, and a method for producing the cuprous oxide powder by a chemical reducing process. In a method for producing a cuprous oxide powder by adding a reducing agent, such as a reducing sugar, to a solution containing copper hydroxide, which is formed by adding one of an alkali solution and a copper ion containing solution to the other thereof, to deposit cuprous oxide particles by reduction, 0.00001 to 0.04 moles (10 to 40000 ppm) of ferrous ions with respect to the amount of copper ions in the copper ion containing solution are added to the copper ion containing solution before forming copper hydroxide, to produce a cuprous oxide powder which has a mean primary particle diameter of not greater than 0.5 micrometers when it is measured by a scanning electron microscope (SEM), the cuprous oxide powder having a 50% particle diameter (D50 diameter) of not greater than 0.Type: GrantFiled: September 13, 2012Date of Patent: December 15, 2015Assignee: DOWA ELECTRONICS MATERIALS CO., LTD.Inventors: Yuki Kaneshiro, Shinichi Suenaga, Akihiro Asano
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Patent number: 8951635Abstract: A bonded magnet is required to have a large energy product, which is the product of magnetization Br and coercive force Hc. However, in a ferrite powder for a bonded magnet, when the particle diameter is reduced to improve the coercive force, the packing properties are impaired, and the Br is lowered. When the particle diameter is increased to improve the magnetization, the coercive force is lowered. Therefore, to increase the energy product, both the Br and Hc must be increased. A ferrite powder that has a large particle size, is composed of smooth crystals, and suffers only a small reduction in coercive force even after pressurization is obtained by mixing a fine ferrite powder having a small particle size with a ferrite powder calcined at a temperature of 1050° C. to 1300° C. in the presence of a chloride at its saturated vapor pressure and then annealing the mixture at 800° C. to 1100° C. A bonded magnet produced using the powder has an energy product of 2.0 MGOe or more.Type: GrantFiled: April 9, 2010Date of Patent: February 10, 2015Assignee: Dowa Electronics Materials Co., Ltd.Inventors: Shinichi Suenaga, Kouji Hirata, Satoru Tsuboi, Keisuke Ayabe, Kazuyosi Horii
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Publication number: 20140199204Abstract: There are provided a cuprous oxide powder having a smaller particle diameter than that of conventional cuprous oxide powders, and a method for producing the cuprous oxide powder by a chemical reducing process. In a method for producing a cuprous oxide powder by adding a reducing agent, such as a reducing sugar, to a solution containing copper hydroxide, which is formed by adding one of an alkali solution and a copper ion containing solution to the other thereof, to deposit cuprous oxide particles by reduction, 0.00001 to 0.04 moles (10 to 40000 ppm) of ferrous ions with respect to the amount of copper ions in the copper ion containing solution are added to the copper ion containing solution before forming copper hydroxide, to produce a cuprous oxide powder which has a mean primary particle diameter of not greater than 0.5 micrometers when it is measured by a scanning electron microscope (SEM), the cuprous oxide powder having a 50% particle diameter (D50 diameter) of not greater than 0.Type: ApplicationFiled: September 13, 2012Publication date: July 17, 2014Applicant: DOWA ELECTRONICS MATERIALS CO., LTD.Inventors: Yuki Kaneshiro, Shinichi Suenaga, Akihiro Asano
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Publication number: 20130177471Abstract: There are provided a copper powder for conductive paste, which comprises monodisperse and spherical fine copper particles having a sharp particle size distribution and containing no coarse particles and which can form a thinner electrode film while avoiding a bad influence on electric characteristics thereof, and a method for stably producing such a copper powder for conductive paste. After copper is complexed by adding a complexing agent to an aqueous solution containing copper while blowing air into the solution, the blowing of air is stopped, and then, a reducing agent is added to the solution to deposit copper particles by reduction.Type: ApplicationFiled: September 12, 2011Publication date: July 11, 2013Applicant: DOWA ELECTRONICS MATERIALS CO., LTD.Inventors: Yuki Kaneshiro, Shinichi Suenaga, Hidefumi Fujita, Minoru Kishida
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Patent number: 8337714Abstract: The present invention provides ferrite powders for bonded magnet capable of suppressing increase of SFD, while widening a particle size distribution for obtaining flowability and compressed density, and also capable of suppressing deterioration of orientation and magnetizability, and provides a process for a production magnetoplumbite-type ferrite powders containing an oxide of at least one or more kinds of transition metals selected from a group consisting of Zr, Ti, Zn, Co, Mn, and Ni, having a mean particle size of 0.20 ?m or more and less than 5.00 ?m, being the ferrite powders for bonded magnet with the ratio of particles having particle size of 1 ?m or less being 20 mass % or more in the magnetoplumbite-type ferrite powder size distribution obtained by a laser diffraction type particle size distribution analyzer.Type: GrantFiled: September 26, 2008Date of Patent: December 25, 2012Assignees: Dowa Electronics Materials Co., Ltd., Dowa F-Tec Co., Ltd.Inventors: Kazuyuki Nakaue, Shinichi Suenaga, Masahiro Kojima, Hiroya Ikeda, Satoru Tsuboi
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Publication number: 20120015189Abstract: A bonded magnet is required to have a large energy product, which is the product of magnetization Br and coercive force Hc. However, in a ferrite powder for a bonded magnet, when the particle diameter is reduced to improve the coercive force, the packing properties are impaired, and the Br is lowered. When the particle diameter is increased to improve the magnetization, the coercive force is lowered. Therefore, to increase the energy product, both the Br and Hc must be increased. A ferrite powder that has a large particle size, is composed of smooth crystals, and suffers only a small reduction in coercive force even after pressurization is obtained by mixing a fine ferrite powder having a small particle size with a ferrite powder calcined at a temperature of 1050° C. to 1300° C. in the presence of a chloride at its saturated vapor pressure and then annealing the mixture at 800° C. to 1100° C. A bonded magnet produced using the powder has an energy product of 2.0 MGOe or more.Type: ApplicationFiled: April 9, 2010Publication date: January 19, 2012Applicant: DOWA Electronics Materials Co., Ltd.Inventors: Shinichi Suenaga, Kouji Hirata, Satoru Tsuboi, Keisuke Ayabe, Kazuyosi Horii
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Publication number: 20100295643Abstract: The present invention provides ferrite powders for bonded magnet capable of suppressing increase of SFD, while widening a particle size distribution for obtaining flowability and compressed density, and also capable of suppressing deterioration of orientation and magnetizability, and provides a process for a production magnetoplumbite-type ferrite powders containing an oxide of at least one or more kinds of transition metals selected from a group consisting of Zr, Ti, Zn, Co, Mn, and Ni, having a mean particle size of 0.20 ?m or more and less than 5.00 ?m, being the ferrite powders for bonded magnet with the ratio of particles having particle size of 1 ?m or less being 20 mass % or more in the magnetoplumbite-type ferrite powder size distribution obtained by a laser diffraction type particle size distribution analyzer.Type: ApplicationFiled: September 26, 2008Publication date: November 25, 2010Applicants: DOWA ELECTRONICS MATERIALS CO., LTD, DOWA F-TEC CO., LTDInventors: Kazuyuki Nakaue, Shinichi Suenaga, Masahiro Kojima, Hiroya Ikeda, Satoru Tsuboi
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Patent number: 7390424Abstract: A ferrite magnetic powder for bonded magnets bonded using a rubber-base resin as binder, which powder is a ferrite magnetic powder containing an alkaline earth metal and having a chlorine content of 0.05 wt % or less and a powder pH of less than 6. The magnetic powder is produced by pulverizing a calcinated product of ferrite composition containing an alkali earth metal, annealing the pulverized ferrite composition to relieve crystal strain, dispersing the annealed powder in water and adding to it a mineral acid, adding a dispersant thereto, and subjecting the dispersion to solid-liquid separation followed by vacuum drying to obtain a ferrite magnetic powder having a chlorine content of 0.05 wt % or less and a powder pH of less than 6.Type: GrantFiled: February 13, 2004Date of Patent: June 24, 2008Assignees: Dowa Electronics Materials Co., Ltd., Nippon Bengara Kogyo Co., Ltd.Inventors: Masayasu Senda, Shinichi Suenaga, Hideki Katayama
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Patent number: 7384571Abstract: A ferrite magnetic powder for bond magnet that experiences only small decrease in coercivity when molded into a bond magnet is provided, which is a ferrite magnetic powder that includes an alkaline-earth metal constituent and exhibits a decrease in coercivity of not greater than 600 Oe when subjected to a prescribed molding test. The magnetic powder can be obtained by mixing a fine ferrite powder of an average particle diameter of greater than 0.50 to 1.0 ?m and a coarse ferrite powder of an average particle diameter of greater than 2.50 to 5.0 ?m at ratio to incorporate the fine powder at a content ratio of 15-40 wt %.Type: GrantFiled: February 6, 2007Date of Patent: June 10, 2008Assignees: Dowa Electronics Materials Co., Ltd., Nippon Bengara Kogyo Co., Ltd.Inventors: Masayasu Senda, Shinichi Suenaga, Keisuke Ayabe, Toshiyuki Sakai
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Patent number: 7255807Abstract: A ferrite magnetic powder for bond magnet that experiences only small decrease in coercivity when molded into a bond magnet is provided, which is a ferrite magnetic powder that includes an alkaline-earth metal constituent and exhibits a decrease in coercivity of not greater than 600 Oe when subjected to a prescribed molding test. The magnetic powder can be obtained by mixing a fine ferrite powder of an average particle diameter of greater than 0.50 to 1.0 ?m and a coarse ferrite powder of an average particle diameter of greater than 2.50 to 5.0 ?m at ratio to incorporate the fine powder at a content ratio of 15-40 wt %.Type: GrantFiled: April 22, 2004Date of Patent: August 14, 2007Assignee: Dowa Mining Co., Ltd.Inventors: Masayasu Senda, Shinichi Suenaga, Keisuke Ayabe, Toshiyuki Sakai
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Publication number: 20070131893Abstract: A ferrite magnetic powder for bond magnet that experiences only small decrease in coercivity when molded into a bond magnet is provided, which is a ferrite magnetic powder that includes an alkaline-earth metal constituent and exhibits a decrease in coercivity of not greater than 600 Oe when subjected to a prescribed molding test. The magnetic powder can be obtained by mixing a fine ferrite powder of an average particle diameter of greater than 0.50 to 1.0 ?m and a coarse ferrite powder of an average particle diameter of greater than 2.50 to 5.0 ?m at ratio to incorporate the fine powder at a content ratio of 15-40 wt %.Type: ApplicationFiled: February 6, 2007Publication date: June 14, 2007Inventors: Masayasu Senda, Shinichi Suenaga, Keisuke Ayabe, Toshiyuki Sakai
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Publication number: 20060163525Abstract: A ferrite magnetic powder for bonded magnets bonded using a rubber-base resin as binder, which powder is a ferrite magnetic powder containing an alkali earth metal and having a chlorine content of 0.05 wt % or less and a powder pH of less than 6. The magnetic powder is produced by pulverizing a calcinated product of ferrite composition containing an alkali earth metal, annealing the pulverized ferrite composition to relieve crystal strain, dispersing the annealed powder in water and neutralizing it with a mineral acid, adding a dispersant thereto, and subjecting the dispersion to solid-liquid separation followed by vacuum drying to obtain a ferrite magnetic powder having a chlorine content of 0.05 wt % or less and a powder pH of less than 6.Type: ApplicationFiled: February 13, 2004Publication date: July 27, 2006Inventors: Masayasu Senda, Shinichi Suenaga, Hideki Katayama
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Publication number: 20040212472Abstract: A ferrite magnetic powder for bond magnet that experiences only small decrease in coercivity when molded into a bond magnet is provided, which is a ferrite magnetic powder that includes an alkali-earth metal constituent and exhibits a decrease in coercivity of not greater than 600 Oe when subjected to a prescribed molding test. The magnetic powder can be obtained by mixing a fine ferrite powder of an average particle diameter of greater than 0.50 to 1.0 &mgr;m and a coarse ferrite powder of an average particle diameter of greater than 2.50 to 5.0 &mgr;m at ratio to incorporate the fine powder at a content ratio of 15-40 wt %.Type: ApplicationFiled: April 22, 2004Publication date: October 28, 2004Inventors: Masayasu Senda, Shinichi Suenaga, Keisuke Ayabe, Toshiyuki Sakai
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Patent number: 6684026Abstract: In an information recording device, variable-speed reproduction by software control is to be enabled. To this end, the information recording device has an HDD for recording an audio/visual digital data stream with a logical sector as an accessing unit, and an AV micro-computer system 10. This AV micro-computer system 10 has, as a recording data unit, a fixed length of the audio/visual digital data stream corresponding to an integer number multiple of a frame length. The AV micro-computer system 10 allocates the recording data unit to a minimum number of the logical sectors that can record the recording data unit in its entirety, while stuffing dummy data in the remaining portion of a logical sector of the digital data stream.Type: GrantFiled: September 8, 1998Date of Patent: January 27, 2004Assignee: Sony CorporationInventors: Keiji Kanota, Shunji Okada, Shinichi Suenaga, Nobuko Fujii
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Patent number: 6647201Abstract: An audio signal and a video signal are recorded onto a hard disk. In the hard disk, by time-divisionally processing the recording and reproduction, they are executed in parallel. Audio data as much as four fields and corresponding video data as much as one field are constructed as one set and are time-sequentially recorded. In a one-time speed reproduction, the data is reproduced every set. The video data is repetitively reproduced for a period of time of four fields. In a double-speed reproduction, the video data is reproduced every other data and the audio data as much as four fields corresponding to the video data which is reproduced and the audio data as much as subsequent four fields are reproduced. To reproduce the audio data as much as eight fields for a period of time of four fields, the speed of the audio data is converted to a double speed and the audio data is continuously reproduced.Type: GrantFiled: December 28, 1998Date of Patent: November 11, 2003Assignee: Sony CorporationInventors: Kosuke Yoshimura, Shinichi Suenaga, Hitoshi Nakamura
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Publication number: 20030156823Abstract: An audio signal and a video signal are recorded onto a hard disk. In the hard disk, by time-divisionally processing the recording and reproduction, they are executed in parallel. Audio data as much as four fields and corresponding video data as much as one field are constructed as one set and are time-sequentially recorded. In a one-time speed reproduction, the data is reproduced every set. The video data is repetitively reproduced for a period of time of four fields. In a double-speed reproduction, the video data is reproduced every other data and the audio data as much as four fields corresponding to the video data which is reproduced and the audio data as much as subsequent four fields are reproduced. To reproduce the audio data as much as eight fields for a period of time of four fields, the speed of the audio data is converted to a double speed and the audio data is continuously reproduced.Type: ApplicationFiled: December 28, 1998Publication date: August 21, 2003Inventors: KOSUKE YOSHIMURA, SHINICHI SUENAGA, HITOSHI NAKAMURA
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Patent number: 6498893Abstract: A recording/reproducing apparatus by which optimum playback pictures can be produced eve in case of parallel recording/reproduction. A storage unit 123 transiently stores video signals obtained from an overwrite type disc-shaped recording medium 102. A signal processing unit 122 decodes video signals stored in the storage unit 123. A holding unit 124 holds video signals decoded by the signal decoding unit 122. A control unit 101 performs control of the entire apparatus and also performs control for address management and data transfer of the disc-shaped recording medium 102 so that, if the apparatus is set to a mode of performing a playback operation while the recording operation is going on, the storage means 123 stores plural fields of the video signals and the holding unit 124 interpolates the video signals.Type: GrantFiled: April 30, 1997Date of Patent: December 24, 2002Assignee: Sony CorporationInventors: Shinichi Suenaga, Kosuke Yoshimura
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Publication number: 20020071655Abstract: In an information recording device, variable-speed reproduction by software control is to be enabled. To this end, the information recording device has an HDD for recording an audio/visual digital data stream with a logical sector as an accessing unit, and an AV micro-computer system 10. This AV micro-computer system 10 has, as a recording data unit, a fixed length of the audio/visual digital data stream corresponding to an integer number multiple of a frame length. The AV micro-computer system 10 allocates the recording data unit to a minimum number of the logical sectors that can record the recording data unit in its entirety, while stuffing dummy data in the remaining portion of a logical sector of the digital data stream.Type: ApplicationFiled: September 8, 1998Publication date: June 13, 2002Inventors: KEIJI KANOTA, SHUNJI OKADA, SHINICHI SUENAGA, NOBUKO FUJII
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Patent number: 6279061Abstract: It is intended to make it possible to deal with an electronic apparatus as if it were a different kind of electronic apparatus. An editor outputs a command to be used in controlling a video cassette recorder to a 1394 communication section via an IEEE 1394 bus. A system controller receives the command according to the IEEE 1394 interface via a LINK and converts it into a command according to the IDE interface, which is output to an IDE controller. The IDE controller converts data that is input via the LINK and a FIFO memory into a command according to the IDE interface and supplies it to a HDD via an IDE interface.Type: GrantFiled: March 9, 1998Date of Patent: August 21, 2001Assignee: Sony CorporationInventors: Yukihiko Aoki, Shinichi Suenaga, Takeshi Miura