Patents by Inventor Kiyohide Ogasawara
Kiyohide Ogasawara 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: 7994698Abstract: An electron emitting device includes an amorphous electron supply layer, an insulating layer formed on the electron supply layer, and an electrode formed on the insulating layer. The electron emits device emitting electrons when an electric field is applied between the electron supply layer and the electrode. The electron emitting device includes a concave portion provided by notching the electrode and the insulating layer to expose the electron supply layer, and a carbon layer covering the electrode and the concave portion except for an inner portion of an exposed surface 4a of the electron supply layer and being in contact with an edge portion of the exposed surface of the electron supply layer.Type: GrantFiled: March 26, 2007Date of Patent: August 9, 2011Assignee: Pioneer CorporationInventors: Ryota Tanaka, Nobuyasu Negishi, Kazuto Sakemura, Yoshiyuki Okuda, Tomonari Nakada, Atsushi Watanabe, Takamasa Yoshikawa, Kiyohide Ogasawara
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Patent number: 7902760Abstract: Provided is a method of driving an electron emission apparatus that drives the apparatus including a plurality of electron emission devices each having an electron supply layer formed of silicon, a silicon-based mixture or a compound thereof, an insulator layer formed on the electron supply layer and a thin film metal electrode formed on the insulator layer. The plurality of electron emission devices are sealed and the method includes: a driving step for supplying power between the electron supply layer and the thin film metal electrode to cause electrons to be emitted from the electron emission device and a reactivating step for applying a reactivating voltage at a level equal to or higher than an applied voltage value which causes discontinuity in differential value of the device current flowing between the electron supply layer and the thin film metal electrode with respect to the applied voltage.Type: GrantFiled: June 24, 2005Date of Patent: March 8, 2011Assignee: Pioneer CorporationInventors: Nobuyasu Negishi, Kazuto Sakemura, Takamasa Yoshikawa, Kiyohide Ogasawara
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Publication number: 20090284129Abstract: [PROBLEMS] To provide an electron emitting layer with improved efficiency of electron emission and prevented damage of the device. [SOLVING MEANS] An electron emitting device including an amorphous electron supply layer 4, an insulating layer 5 formed on the electron supply layer 4, and an electrode 6 formed on the insulating layer 5, the electron emitting device emitting electrons when an electric field is applied between the electron supply layer 4 and the electrode 6, wherein the electron emitting device includes a concave portion 7 provided by notching the electrode 6 and the insulating layer 5 to expose the electron supply layer 4, and a carbon layer 8 covering the electrode 6 and the concave portion 7 except for an inner portion 4b of an exposed surface 4a of the electron supply layer 4 and being in contact with an edge portion 4c of the exposed surface 4a of the electron supply layer 4.Type: ApplicationFiled: March 26, 2007Publication date: November 19, 2009Inventors: Ryota Tanaka, Nobuyasu Negishi, Kazuto Sakemura, Yoshiyuki Okuda, Tomonari Nakada, Atsushi Watanabe, Takamasa Yoshikawa, Kiyohide Ogasawara
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Publication number: 20080211401Abstract: An electron emission device including a lower electrode on a near side to a substrate and an upper electrode on a far side to the substrate and an insulator layer and an electron supply layer stacked between the lower electrode and the upper electrode and emitting an electron from the upper electrode side at the time of applying a voltage between the lower electrode and the upper electrode, which includes an electron emission part provided with an opening formed by an inner wall of a stepped shape in which a thickness of the insulator layer decreases stepwise; and a carbon-containing carbon region which is connected to the upper electrode side and which is brought into contact with the insulator layer and the electron supply layer.Type: ApplicationFiled: November 15, 2005Publication date: September 4, 2008Inventors: Tomonari Nakada, Nobuyasu Negishi, Kazuto Sakemura, Yoshiyuki Okuda, Saburo Aso, Atsushi Watanabe, Takamasa Yoshikawa, Kiyohide Ogasawara
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Publication number: 20080203947Abstract: Provided is a method of driving an electron emission apparatus used in displays, imaging devices, flat-surface light sources and the like which can restrain a change with time.Type: ApplicationFiled: June 24, 2005Publication date: August 28, 2008Inventors: Nobuyasu Negishi, Kazuto Sakemura, Takamasa Yoshikawa, Kiyohide Ogasawara
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Patent number: 7095040Abstract: An electron-emitting device includes an electron source layer made of a metal, a metal alloy or a semiconductor, an insulating layer formed on the electron source layer and a metal thin film electrode formed on the insulating layer. Electrons are emitted upon application of an electric field between the electron source layer and the metal thin film electrode. The insulating layer has at least one island region which constitutes an electron-emitting section in which the film thickness of the insulating layer is gradually reduced. The electron-emitting device further includes a carbon region made of carbon or a carbon compound on at least one of a top, bottom and inside of the island region.Type: GrantFiled: January 4, 2001Date of Patent: August 22, 2006Assignee: Pioneer CorporationInventors: Shingo Iwasaki, Takashi Yamada, Takuya Hata, Takashi Chuman, Nobuyasu Negishi, Kazuto Sakemura, Atsushi Yoshizawa, Hideo Satoh, Takamasa Yoshikawa, Kiyohide Ogasawara
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Publication number: 20040251841Abstract: An electron emitting device includes an electron-supply layer made of at least one of silicon, a mixture containing silicon as a main component and a silicon compound in an amorphous phase, an insulator layer formed on the electron-supply layer and a thin-film metal electrode formed on the insulator layer. Electrons are emitted upon application of an electric field between the electron-supply layer and the thin-film metal electrode. The insulator layer has at least one island region that constitutes an electron emitting section in which the film thickness of the insulator layer is gradually reduced. The electron emitting device further includes a carbon region made of at least of carbon, a mixture containing carbon as a main component and a carbon compound on at least one of a top, bottom and inside of the island region.Type: ApplicationFiled: May 24, 2004Publication date: December 16, 2004Inventors: Nobuyasu Negishi, Takashi Yamada, Takamasa Yoshikawa, Kiyohide Ogasawara, Hideo Sato, Takashi Chuman, Shingo Iwasaki, Kazuto Sakemura, Takuya Hata
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Patent number: 6787992Abstract: A display device has an emitting region constituted by a plurality of first electrodes provided on a substrate and extending in parallel, a plurality of second electrodes provided on the first electrodes and extending substantially perpendicularly to the first electrodes, and a plurality of emission sites for emitting electrons or light respectively connected to a plurality of intersections between the first and second electrodes and arranged on the substrate and has a peripheral region surrounding the emitting region on the substrate. In this display device, first and second groups of external repeating terminals for the first and second electrodes are collectively provided side by side in a part of the peripheral region.Type: GrantFiled: December 28, 2001Date of Patent: September 7, 2004Assignee: Pioneer CorporationInventors: Takashi Chuman, Takamasa Yoshikawa, Takuya Hata, Kazuto Sakemura, Takashi Yamada, Nobuyasu Negishi, Shingo Iwasaki, Hideo Satoh, Atsushi Yoshizawa, Kiyohide Ogasawara
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Patent number: 6744063Abstract: An image pickup device includes a pair of first and second substrate facing each other with a vacuum space interposed therebetween, and a plurality of electron-emitting devices provided over said first substrate and a photoconductive layer provided over said second substrate. Each electron-emitting device includes an insulating layer deposited over an electron source layer formed over an ohmic electrode; and a metal thin film electrode deposited over said insulating layer. The insulating layer and said metal thin film electrode have an island region of electron-emitting section in which their film thicknesses are gradually reduced toward said electron source layer.Type: GrantFiled: January 5, 2001Date of Patent: June 1, 2004Assignee: Pioneer CorporationInventors: Takamasa Yoshikawa, Hideo Satoh, Atsushi Yoshizawa, Takashi Yamada, Takashi Chuman, Nobuyasu Negishi, Shingo Iwasaki, Kazuto Sakemura, Takuya Hata, Kiyohide Ogasawara
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Patent number: 6700132Abstract: A display device includes a backside and a front-side substrates facing each other with a vacuum space therebetween; and a plurality of electron emission sites provided on the backside substrate. Each electron emission sites includes a bottom electrode formed on a surface of the backside substrate proximate to the vacuum space, an insulator layer formed over the bottom electrode, and a top electrode formed on the insulator layer and arranged individually apart from each other and facing the vacuum space. The display device also includes a plurality of bus electrodes for electrically connecting the neighboring top electrodes; and insulating protective films each provided between the bus electrode and the insulator layer and between the bus electrode and the backside substrate.Type: GrantFiled: December 28, 2001Date of Patent: March 2, 2004Assignee: Pioneer CorporationInventors: Takashi Chuman, Takamasa Yoshikawa, Takuya Hata, Kazuto Sakemura, Takashi Yamada, Nobuyasu Negishi, Shingo Iwasaki, Hideo Satoh, Atsushi Yoshizawa, Kiyohide Ogasawara
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Publication number: 20030048745Abstract: An image pickup device includes a pair of first and second substrate facing each other with a vacuum space interposed therebetween, and a plurality of electron-emitting devices provided over said first substrate and a photoconductive layer provided over said second substrate. Each electron-emitting device includes an insulating layer deposited over an electron source layer formed over an ohmic electrode; and a metal thin film electrode deposited over said insulating layer. The insulating layer and said metal thin film electrode have an island region of electron-emitting section in which their film thicknesses are gradually reduced toward said electron source layer.Type: ApplicationFiled: January 5, 2001Publication date: March 13, 2003Applicant: Pioneer CorporationInventors: Takamasa Yoshikawa, Hideo Satoh, Atsushi Yoshizawa, Takashi Yamada, Takashi Chuman, Nobuyasu Negishi, Shingo Iwasaki, Kazuto Sakemura, Takuya Hata, Kiyohide Ogasawara
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Patent number: 6472803Abstract: An electron emission light-emitting device comprises an electron emission device and a fluorescent material layer formed on the thin-film metal. The electron emission device comprises an electron-supply layer made of semiconductor formed on an ohmic electrode; an insulator layer formed on the electron-supply layer; and a thin-film metal electrode formed on the insulator layer. The electron emission light-emitting device emits light when an electric field is applied between the electron-supply layer and the thin-film metal.Type: GrantFiled: August 6, 1999Date of Patent: October 29, 2002Assignee: Pioneer CorporationInventors: Atsushi Yoshizawa, Hideo Satoh, Takashi Yamada, Takashi Chuman, Nobuyasu Negishi, Shingo Iwasaki, Takuya Hata, Takamasa Yoshikawa, Hiroshi Ito, Kiyohide Ogasawara
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Publication number: 20020125490Abstract: A display device includes a backside and a front-side substrates facing each other with a vacuum space therebetween; and a plurality of electron emission sites provided on the backside substrate. Each electron emission sites includes a bottom electrode formed on a surface of the backside substrate proximate to the vacuum space, an insulator layer formed over the bottom electrode, and a top electrode formed on the insulator layer and arranged individually apart from each other and facing the vacuum space. The display device also includes a plurality of bus electrodes for electrically connecting the neighboring top electrodes; and insulating protective films each provided between the bus electrode and the insulator layer and between the bus electrode and the backside substrate.Type: ApplicationFiled: December 28, 2001Publication date: September 12, 2002Applicant: PIONEER CORPORATIONInventors: Takashi Chuman, Takamasa Yoshikawa, Takuya Hata, Kazuto Sakemura, Takashi Yamada, Nobuyasu Negishi, Shingo Iwasaki, Hideo Satoh, Atsushi Yoshizawa, Kiyohide Ogasawara
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Publication number: 20020117963Abstract: A display device has an emitting region constituted by a plurality of first electrodes provided on a substrate and extending in parallel, a plurality of second electrodes provided on the first electrodes and extending substantially perpendicularly to the first electrodes, and a plurality of emission sites for emitting electrons or light respectively connected to a plurality of intersections between the first and second electrodes and arranged on the substrate and has a peripheral region surrounding the emitting region on the substrate. In this display device, first and second groups of external repeating terminals for the first and second electrodes are collectively provided side by side in a part of the peripheral region.Type: ApplicationFiled: December 28, 2001Publication date: August 29, 2002Applicant: PIONEER CORPORATIONInventors: Takashi Chuman, Takamasa Yoshikawa, Takuya Hata, Kazuto Sakemura, Takashi Yamada, Nobuyasu Negishi, Shingo Iwasaki, Hideo Satoh, Atsushi Yoshizawa, Kiyohide Ogasawara
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Publication number: 20020076070Abstract: A speaker includes a silicone wafer 1, a thermal barrier layer 2 formed by anodizing a part of the silicone wafer 1, and an exothermic electrode 3 made of aluminum formed on the thermal barrier layer 2.Type: ApplicationFiled: December 11, 2001Publication date: June 20, 2002Applicant: PIONEER CORPORATIONInventors: Takamasa Yoshikawa, Kiyohide Ogasawara, Hideo Satoh, Atsushi Yoshizawa, Shingo Iwasaki, Nobuyasu Negishi, Takashi Yamada, Takashi Chuman, Kazuto Sakemura, Takuya Hata
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Patent number: 6404124Abstract: An electron emission device comprises an electron-supply layer made of metal or semiconductor and disposed on an ohmic electrode; an insulator layer formed on the electron-supply layer; and a thin-film metal electrode formed on the insulator layer. The electron-supply layer has a rectifier function layer, whereby the electron emission device emits electrons when an electric field is applied between the electron-supply layer and the thin-film metal.Type: GrantFiled: July 28, 1999Date of Patent: June 11, 2002Assignee: Pioneer Electronic CorporationInventors: Kazuto Sakemura, Shuuichi Yanagisawa, Shingo Iwasaki, Nobuyasu Negishi, Takashi Chuman, Takashi Yamada, Atsushi Yoshizawa, Hideo Satoh, Takamasa Yoshikawa, Kiyohide Ogasawara
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Patent number: 6400070Abstract: An electron emission device exhibits a high electron emission efficiency. The device includes an electron-supply layer of metal or semiconductor, an insulator layer formed on the electron-supply layer, and a thin-film metal electrode formed on the insulator layer. The insulator layer has a film thickness of 50 nm or greater. The electron-supply layer is made of a silicon wafer. When an electric field is applied between the electron-supply layer and the thin-film metal electrode, the electron emission device emits electrons.Type: GrantFiled: August 7, 1998Date of Patent: June 4, 2002Assignee: Pioneer Electronic CorporationInventors: Takashi Yamada, Kiyohide Ogasawara, Takamasa Yoshikawa, Takashi Chuman, Nobuyasu Negishi, Shingo Iwasaki, Hiroshi Ito, Atsushi Yoshizawa, Shuuichi Yanagisawa, Kazuto Sakemura
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Patent number: 6388376Abstract: An electron emission device comprises an electron-supply layer made of metal or semiconductor and disposed on an ohmic electrode; an insulator layer formed on the electron-supply layer; and a thin-film metal electrode formed on the insulator layer. The electron-supply layer is essentially composed of elements belonging to group IV and contains an additive of at least one material selected from atomic elements belonging to group III or V.Type: GrantFiled: August 5, 1999Date of Patent: May 14, 2002Assignee: Pioneer CorporationInventors: Nobuyasu Negishi, Takuya Hata, Atsushi Yoshizawa, Hideo Satoh, Takashi Yamada, Takashi Chuman, Shingo Iwasaki, Takamasa Yoshikawa, Hiroshi Ito, Kiyohide Ogasawara
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Publication number: 20010040430Abstract: An electron emission device exhibits a high electron emission efficiency. The device includes an electron-supply layer of metal or semiconductor, an insulator layer formed on the electron-supply layer, and a thin-film metal electrode formed on the insulator layer. The insulator layer has a film thickness of 50 nm or greater. The electron-supply layer has a silicide layer. When an electric field is applied between the electron-supply layer and the thin-film metal electrode, the electron emission device emits electrons.Type: ApplicationFiled: August 7, 1998Publication date: November 15, 2001Inventors: HIROSHI ITO, KIYOHIDE OGASAWARA, TAKAMASA YOSHIKAWA, TAKASHI CHUMAN, NOBUYASU NEGISHI, SHINGO IWASAKI, ATSUSHI YOSHIZAWA, TAKASHI YAMADA, SHUUICHI YANAGISAWA, KAZUTO SAKEMURA
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Patent number: 6316873Abstract: An electron emission device exhibits a high electron emission efficiency. The device includes an electron-supply layer of metal or semiconductor, an insulator layer formed on the electron-supply layer, and a thin-film metal electrode formed on the insulator layer. The insulator layer has a film thickness of 50 nm or greater. The electron-supply layer has a silicide layer. When an electric field is applied between the electron-supply layer and the thin-film metal electrode, the electron emission device emits electrons.Type: GrantFiled: August 7, 1998Date of Patent: November 13, 2001Assignee: Pioneer Electronic CorporationInventors: Hiroshi Ito, Kiyohide Ogasawara, Takamasa Yoshikawa, Takashi Chuman, Nobuyasu Negishi, Shingo Iwasaki, Atsushi Yoshizawa, Takashi Yamada, Shuuichi Yanagisawa, Kazuto Sakemura