Patents by Inventor Takamasa Yoshikawa
Takamasa Yoshikawa 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: 20050073659Abstract: An illuminating optical system for focusing a radiant light of a light source (1) onto a reflecting light valve (6) and a projection lens (7) for magnifying and projecting a reflected light from the reflecting light valve (6) onto a screen are provided, a diaphragm (31) is disposed at a substantially conjugate position of an entrance pupil of the projection lens (7) on an optical path of the illuminating optical system, the diaphragm (31) has an opening whose area is changed by a light-shielding member, and a shape of a shielded portion of the diaphragm (31) shielded by the light-shielding member is rotationally asymmetric to an optical axis (12) of the illuminating optical system. Accordingly, shielding of necessary light can be better avoided compared with a diaphragm for changing the light-shielding area in a rotationally symmetric manner, for example, a diaphragm for narrowing the opening concentrically, making it possible to improve contrast performance while minimizing brightness reduction.Type: ApplicationFiled: April 23, 2002Publication date: April 7, 2005Inventors: Shinya Sannohe, Hideki Ishinaga, Takamasa Yoshikawa
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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: 6776510Abstract: A light source apparatus in which an optical arrangement of a light source and a concave mirror is properly adjusted without requiring a large-scale device and a method for manufacturing the same, an adjusting device for adjusting the optical arrangement in the light source apparatus, and a lighting system and a projection display system using the light source apparatus.Type: GrantFiled: November 27, 2000Date of Patent: August 17, 2004Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Yuusaku Shimaoka, Shinya Sannohe, Takamasa Yoshikawa
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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: 20030228461Abstract: In a first polishing step, or in a first half of a super precision polishing, a surface of a glass substrate is polished with a first suspension. The first suspension contains particles and a dispersion agent in which the particles are dispersed. The main ingredient of the particles is silicon dioxide (SiO2), and the average size (D50) of the particles is equal to or less than 100 nm. The dispersion medium comprises an acid solution the pH of which is equal to or less than 4. In a second polishing step, or in a latter half of the super precision polishing, the surface of the glass substrate is continuously polished with a second suspension. The second suspension contains particles and a dispersion agent in which the particles are dispersed. The main ingredient of the particles is silicon dioxide (SiO2), and the average size (D50) of the particles is equal to or less than 100 nm. The dispersion medium comprises an alkaline solution the pH of which is equal to or more than 8.5.Type: ApplicationFiled: June 4, 2003Publication date: December 11, 2003Inventors: Takamasa Yoshikawa, Koichi Suzuki
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Patent number: 6641887Abstract: Provided is an optical recording medium whose surface is not easily injured, particularly an optical recording medium which is not required to be put into a cartridge. The optical recording medium comprises a recording layer, a covering layer comprising a polymer material, and a protective layer which are successively deposited, recording or reproducing wavelength for the medium being 420 nm or less, the numerical aperture of an optical system for the medium being 0.74 or more, and light being radiated to the side of the protective layer to read out data in the recording layer. In the medium, the protective layer has a hardness of 1000 kg/mm2 or more and a thickness of 4.66 &mgr;m or less.Type: GrantFiled: October 29, 2001Date of Patent: November 4, 2003Assignee: Pioneer CorporationInventors: Tetsuya Iida, Takamasa Yoshikawa, Katsuhiro Koike
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Publication number: 20030082999Abstract: The present invention provides a method which can simultaneously grind inner peripheral edges and outer peripheral edges of a multiplicity of glass substrates used for magnetic storage media or the like.Type: ApplicationFiled: August 8, 2002Publication date: May 1, 2003Applicant: Nippon Sheet Glass Co., Ltd.Inventors: Takamasa Yoshikawa, Koji Okuhata, Kensuke Matsuno, Takeo Watanabe
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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: 6488378Abstract: An imaging apparatus including a projection section for projecting an image onto a screen, a cooling section for cooling the projection section by means of air, and an exterior cabinet for housing the projection section and the cooling section. The imaging apparatus further includes an exhaust section for exhausting the air used for the cooling of the projection section by the cooling section, from the exterior cabinet. The exhaust section has a function for attenuating a noise caused by the cooling section.Type: GrantFiled: April 16, 2001Date of Patent: December 3, 2002Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Toshiaki Tabuchi, Hideki Ishinaga, Takamasa Yoshikawa, Toshiyuki Ueda, Isao Kakuhari, Kenichi Terai
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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: 20020051859Abstract: Provided is an optical recording medium whose surface is not easily injured, particularly an optical recording medium which is not required to be put into a cartridge. The optical recording medium comprises a recording layer, a covering layer comprising a polymer material, and a protective layer which are successively deposited, recording or reproducing wavelength for the medium being 420 nm or less, the numerical aperture of an optical system for the medium being 0.74 or more, and light being radiated to the side of the protective layer to read out data in the recording layer. In the medium, the protective layer has a hardness of 1000 kg/mm2 or more and a thickness of 4.66 &mgr;m or less.Type: ApplicationFiled: October 29, 2001Publication date: May 2, 2002Applicant: PIONEER CORPORATIONInventors: Tetsuya Iida, Takamasa Yoshikawa, Katsuhiro Koike
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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