Patents by Inventor Akio Ogawa
Akio Ogawa 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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Publication number: 20230420613Abstract: An object of the present invention is to provide an ultraviolet semiconductor light-emitting element that allows a user to easily confirm whether or not it is driven to emit the deep ultraviolet light. An ultraviolet semiconductor light-emitting element according to the present invention includes a single crystal AlN substrate, an n-type AlGaN layer, an active layer, and a p-type AlGaN layer. The n-type AlGaN layer is formed on the single crystal AlN substrate. The active layer is formed on the n-type AlGaN layer. The active layer has a light emission peak wavelength of 250 nm or more and 280 nm or less. The p-type AlGaN layer is formed on the active layer. The C concentration in the single crystal AlN substrate is 3×1017 atoms/cm3 or more.Type: ApplicationFiled: June 15, 2023Publication date: December 28, 2023Applicant: STANLEY ELECTRIC CO., LTD.Inventors: Toru KINOSHITA, Akio OGAWA, Hiroyuki KANO
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Patent number: 10246604Abstract: To provide a method for producing an aqueous liquid containing a vinyl polymer, of which the production efficiency is high, without lowering the yield of the vinyl polymer. When removing a hydrophilic organic solvent from a mixed liquid comprising a vinyl polymer, the hydrophilic organic solvent and water to produce an aqueous liquid containing the vinyl polymer, a liquid phase and a gas phase are formed in a closed container, a part of the liquid of the liquid phase is formed into small droplets and brought into contact with the gas phase to vaporize the hydrophilic organic solvent, and the vaporized hydrophilic organic solvent is removed from the closed container.Type: GrantFiled: July 31, 2017Date of Patent: April 2, 2019Assignee: AGC Inc.Inventors: Shintaro Fukunaga, Katsuya Ueno, Akio Ogawa, Yutaka Ohyama, Teruhiko Yasuda
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Publication number: 20170327710Abstract: To provide a method for producing an aqueous liquid containing a vinyl polymer, of which the production efficiency is high, without lowering the yield of the vinyl polymer. When removing a hydrophilic organic solvent from a mixed liquid comprising a vinyl polymer, the hydrophilic organic solvent and water to produce an aqueous liquid containing the vinyl polymer, a liquid phase and a gas phase are formed in a closed container, a part of the liquid of the liquid phase is formed into small droplets and brought into contact with the gas phase to vaporize the hydrophilic organic solvent, and the vaporized hydrophilic organic solvent is removed from the closed container.Type: ApplicationFiled: July 31, 2017Publication date: November 16, 2017Applicant: Asahi Glass Company, LimitedInventors: Shintaro FUKUNAGA, Katsuya UENO, Akio OGAWA, Yutaka OHYAMA, Teruhiko YASUDA
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Patent number: 9702945Abstract: A magnetic measurement device which can measure the magnetic characteristics in a microregion of a thin plate magnetic sample. After a magnetic sample is applied by a magnetic field and magnetized accordingly, by scanning the magnetic sample using a measuring part, the magnetic flux leakage in the magnetic sample can be measured. The magnetic flux leaks outside by magnetizing a first region and a second region of the magnetic sample in reciprocally opposite directions and reducing the demagnetizing field. Specifically, a magnetic field generating part with at least a pair of magnetic poles is used to perform the magnetization of multiple poles, or the magnetic field generating part applies a damped oscillation magnetic field to perform the magnetization, or a local magnetic field generating part which applies an alternating magnetic field and scans the surface of the sample at the same time is used to perform the magnetization.Type: GrantFiled: December 13, 2012Date of Patent: July 11, 2017Assignee: TDK CORPORATIONInventors: Kenichi Suzuki, Tsutomu Chikamatsu, Akio Ogawa, Kyung-ku Choi, Ryuji Hashimoto
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Patent number: 9488828Abstract: In an optical deflector apparatus including a mirror, an inner frame, an outer frame, an inner piezoelectric actuator adapted to flex the mirror around an axis of the mirror, an outer piezoelectric actuator adapted to flex the mirror around the axis of the mirror, and a driver adapted to generate an offset drive voltage and a rocking drive voltage. The offset drive voltage is applied to a first piezoelectric actuator selected from the inner piezoelectric actuator and the outer piezoelectric actuator. The rocking drive voltage is applied to a second piezoelectric actuator different from the first piezoelectric actuator.Type: GrantFiled: June 8, 2015Date of Patent: November 8, 2016Assignee: STANLEY ELECTRIC CO., LTD.Inventors: Keiichi Ikegami, Akio Ogawa
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Patent number: 9436000Abstract: An optical deflector includes a mirror structure having a symmetrical axis on a plane of the mirror structure, an outer frame surrounding the mirror structure, and at least one meander-type piezoelectric actuator coupled between the mirror structure and the outer frame and having a plurality of piezoelectric cantilevers in parallel with the symmetrical axis folded at folded portions. The mirror structure is divided into a first half portion and a second half portion along the symmetrical axis. The first half portion is close to a closest one of the folded portions, and the second half portion is far from the closest one of the folded portions. A mass of the second half portion is larger than a mass of the first half portion.Type: GrantFiled: March 24, 2015Date of Patent: September 6, 2016Assignee: STANLEY ELECTRIC CO., LTD.Inventors: Akio Ogawa, Keiichi Ikegami
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Patent number: 9354285Abstract: A magnetic measurement device which measures coercivity and coercivity distribution in a microregion of a thin plate magnetic sample with high coercivity. A magnetic sample is applied with a magnetic field in a first direction and magnetized, a second magnetic field is applied in a direction opposite to the first, a measuring part scans the sample, measuring magnetic flux leakage due to remnant magnetization in the sample. The intensity of the second magnetic field is gradually increased while the measuring part repeats the measurement to obtain the second magnetic field wherein the magnitude of the leakage from the sample reaches the maximum level, and when a magnetic field equivalent to the coercivity is applied to the sample and about half of the magnetization is reversed, the sample's coercivity is obtained based on the determination that the demagnetizing field Hd reaches the minimum level and the leakage reaches the maximum level.Type: GrantFiled: December 13, 2012Date of Patent: May 31, 2016Assignee: TDK CORPORATIONInventors: Kenichi Suzuki, Tsutomu Chikamatsu, Akio Ogawa, Kyung-ku Choi, Ryuji Hashimoto
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Patent number: 9340633Abstract: Provided is a treatment method for fluororesin pellets to remove hydrofluoric acid released from fluororesin pellets obtained by melt-molding a melt-moldable fluororesin. The treatment method comprises bringing a hydrofluoric acid-removing medium selected from warm water of from 30 to 200° C., steam of from 100 to 200° C. and warm wind of from 40 to 200° C. into contact with fluororesin pellets obtained by melt-molding a melt-moldable fluororesin, and thereby treating the fluororesin pellets so that the amount of hydrofluoric acid released per kg of the resulting fluororesin pellets would be at most 5 ?g as determined after the storage of the resulting fluororesin pellets at 35° C. for 15 days.Type: GrantFiled: January 6, 2014Date of Patent: May 17, 2016Assignee: Asahi Glass Company, LimitedInventors: Satoshi Otsugu, Yuji Tanonaka, Atsushi Tsuji, Shigeru Aida, Akio Ogawa
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Patent number: 9328178Abstract: Provided is a method for producing an ethylene-tetrafluoroethylene copolymer powder, whereby it is possible to simply and inexpensively produce an ethylene-tetrafluoroethylene copolymer powder excellent in handling efficiency from a slurry having an ethylene-tetrafluoroethylene copolymer dispersed in a fluorinated organic solvent. A method for producing an ethylene-tetrafluoroethylene copolymer powder, which comprises feeding, at a feeding linear velocity exceeding 0.10 m/sec.Type: GrantFiled: January 22, 2014Date of Patent: May 3, 2016Assignee: Asahi Glass Company, LimitedInventors: Katsuya Ueno, Atsushi Tsuji, Akio Ogawa, Yasuhiro Suzuki
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Publication number: 20150362724Abstract: In an optical deflector apparatus including a mirror, an inner frame, an outer frame, an inner piezoelectric actuator adapted to flex the mirror around an axis of the mirror, an outer piezoelectric actuator adapted to flex the mirror around the axis of the mirror, and a driver adapted to generate an offset drive voltage and a rocking drive voltage. The offset drive voltage is applied to a first piezoelectric actuator selected from the inner piezoelectric actuator and the outer piezoelectric actuator. The rocking drive voltage is applied to a second piezoelectric actuator different from the first piezoelectric actuator.Type: ApplicationFiled: June 8, 2015Publication date: December 17, 2015Applicant: STANLEY ELECTRIC CO., LTD.Inventors: Keiichi IKEGAMI, Akio OGAWA
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Publication number: 20150277108Abstract: An optical deflector includes a mirror structure having a symmetrical axis on a plane of the mirror structure, an outer frame surrounding the mirror structure, and at least one meander-type piezoelectric actuator coupled between the mirror structure and the outer frame and having a plurality of piezoelectric cantilevers in parallel with the symmetrical axis folded at folded portions. The mirror structure is divided into a first half portion and a second half portion along the symmetrical axis. The first half portion is close to a closest one of the folded portions, and the second half portion is far from the closest one of the folded portions. A mass of the second half portion is larger than a mass of the first half portion.Type: ApplicationFiled: March 24, 2015Publication date: October 1, 2015Applicant: STANLEY ELECTRIC CO., LTD.Inventors: Akio OGAWA, Keiichi IKEGAMI
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Publication number: 20150070005Abstract: A magnetic measurement device which measures coercivity and coercivity distribution in a microregion of a thin plate magnetic sample with high coercivity. A magnetic sample is applied with a magnetic field in a first direction and magnetized, a second magnetic field is applied in a direction opposite to the first, a measuring part scans the sample, measuring magnetic flux leakage due to remnant magnetization in the sample. The intensity of the second magnetic field is gradually increased while the measuring part repeats the measurement to obtain the second magnetic field wherein the magnitude of the leakage from the sample reaches the maximum level, and when a magnetic field equivalent to the coercivity is applied to the sample and about half of the magnetization is reversed, the sample's coercivity is obtained based on the determination that the demagnetizing field Hd reaches the minimum level and the leakage reaches the maximum level.Type: ApplicationFiled: December 13, 2012Publication date: March 12, 2015Inventors: Kenichi Suzuki, Tsutomu Chikamatsu, Akio Ogawa, Kyung-ku Choi, Ryuji Hashimoto
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Publication number: 20140375308Abstract: A magnetic measurement device which can measure the magnetic characteristics in a microregion of a thin plate magnetic sample. After a magnetic sample is applied by a magnetic field and magnetized accordingly, by scanning the magnetic sample using a measuring part, the magnetic flux leakage in the magnetic sample can be measured. The magnetic flux leaks outside by magnetizing a first region and a second region of the magnetic sample in reciprocally opposite directions and reducing the demagnetizing field. Specifically, a magnetic field generating part with at least a pair of magnetic poles is used to perform the magnetization of multiple poles, or the magnetic field generating part applies a damped oscillation magnetic field to perform the magnetization, or a local magnetic field generating part which applies an alternating magnetic field and scans the surface of the sample at the same time is used to perform the magnetization.Type: ApplicationFiled: December 13, 2012Publication date: December 25, 2014Inventors: Kenichi Suzuki, Tsutomu Chikamatsu, Akio Ogawa, Kyung-ku Choi, Ryuji Hashimoto
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Publication number: 20140135465Abstract: Provided is a method for producing an ethylene-tetrafluoroethylene copolymer powder, whereby it is possible to simply and inexpensively produce an ethylene-tetrafluoroethylene copolymer powder excellent in handling efficiency from a slurry having an ethylene-tetrafluoroethylene copolymer dispersed in a fluorinated organic solvent. A method for producing an ethylene-tetrafluoroethylene copolymer powder, which comprises feeding, at a feeding linear velocity exceeding 0.10 m/sec.Type: ApplicationFiled: January 22, 2014Publication date: May 15, 2014Applicant: ASAHI GLASS COMPANY, LIMITEDInventors: Katsuya Ueno, Atsushi Tsuji, Akio Ogawa, Yasuhiro Suzuki
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Patent number: 8546797Abstract: In a ZnO based compound semiconductor device, nitrogen (N) doped (Mg)ZnO:N layer is inserted as a diffusion barrier layer 9 between a ZnO based n-type layer 3 to which n-type dopants are doped and an active layer 4 or a p-type layer 5. The diffusion barrier layer 9 prevents diffusion of the n-type dopants to the active layer 4 or the p-type layer 5. Crystalline quality of the active layer 4 of the ZnO based compound semiconductor device is not deteriorated by the diffusion of the n-type dopants.Type: GrantFiled: October 19, 2010Date of Patent: October 1, 2013Assignee: Stanley Electric Co., Ltd.Inventors: Tomofumi Yamamuro, Hiroyuki Kato, Akio Ogawa
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Patent number: 8436351Abstract: A ZnO-containing semiconductor layer contains Se added to ZnO and has an emission peak wavelength of ultraviolet light and an emission peak wavelength of visual light. By combining the ZnO-containing semiconductor layer with phosphor or a semiconductor which is excited by the emitted ultraviolet light and emits visual light, visual light at various wavelengths can be emitted.Type: GrantFiled: December 15, 2010Date of Patent: May 7, 2013Assignee: Stanley Electric Co., Ltd.Inventors: Tomofumi Yamamuro, Michihiro Sano, Naochika Horio, Hiroyuki Kato, Akio Ogawa, Hiroshi Kotani
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Patent number: 8292203Abstract: To provide a method for producing ETFE granules having a low content of an ethylene/tetrafluoroethylene copolymer oligomer and being excellent in handling efficiency. A method for granulating an ethylene/tetrafluoroethylene copolymer, which is characterized by stirring and granulating a slurry of an ethylene/tetrafluoroethylene copolymer together with water in the presence of both ethylene and tetrafluoroethylene at a granulation temperature of from 10 to 130° C. for a granulation time of from 30 to 240 minutes.Type: GrantFiled: June 20, 2011Date of Patent: October 23, 2012Assignee: Asahi Glass Company, LimitedInventors: Shigeru Aida, Atsushi Tsuji, Akio Ogawa, Toshiyuki Chisaka, Jumpei Nomura
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Patent number: 8143618Abstract: A ZnO based semiconductor device includes: a lamination structure including a first semiconductor layer containing ZnO based semiconductor of a first conductivity type and a second semiconductor layer containing ZnO based semiconductor of a second conductivity type opposite to the first conductivity type, formed above the first semiconductor layer and forming a pn junction together with the first semiconductor layer; and a Zn—Si—O layer containing compound of Zn, Si and O and covering a surface exposing the pn junction of the lamination structure.Type: GrantFiled: February 17, 2009Date of Patent: March 27, 2012Assignee: Stanley Electric Co., Ltd.Inventors: Hiroshi Kotani, Michihiro Sano, Hiroyuki Kato, Naochika Horio, Akio Ogawa, Tomofumi Yamamuro
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Patent number: 8138754Abstract: The characteristics of thin-film magnetic heads are evaluated by measuring, in a step and repeat method and apparatus, the magnetic field generated by the respective heads in a bar including multiple heads.Type: GrantFiled: May 18, 2009Date of Patent: March 20, 2012Assignee: TDK CorporationInventors: Akio Ogawa, Tsutomu Chikamatsu, Kazuyuki Kobayashi, Haruhiko Yamaguchi, Kazunori Matsuiwa, Masaki Ohashi, Kazuyoshi Nakajima, Kiyotaka Shindo
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Patent number: 8039867Abstract: A ZnO-containing semiconductor layer, doped with Se, has an emission peak wavelength in visual light and has a band gap equivalent to a band gap of ZnO.Type: GrantFiled: August 13, 2009Date of Patent: October 18, 2011Assignee: Stanley Electric Co., Ltd.Inventors: Akio Ogawa, Michihiro Sano, Hiroyuki Kato, Naochika Horio, Hiroshi Kotani, Tomofumi Yamamuro