Patents by Inventor Kojiro Okuyama
Kojiro Okuyama 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: 20100156266Abstract: A gas discharge light emitting panel is provided that prevents deterioration in display properties of the panel, which accompanies changes in light-emitting properties of phosphors. It includes a front panel and a rear panel that are disposed to oppose each other, with a discharge space being interposed therebetween, and a phosphor layer that is disposed above a principal surface located on the discharge space side of the rear panel and that emits light by being irradiated with ultraviolet rays generated in the discharge space. The phosphor layer contains first and second phosphors in which the changes in at least one property selected from luminance and chromaticity, which accompany driving of the panel, occur in the opposite directions to each other.Type: ApplicationFiled: July 26, 2006Publication date: June 24, 2010Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.Inventors: Takehiro Zukawa, Seigo Shiraishi, Kojiro Okuyama, Junichi Hibino, Keiji Horikawa
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Publication number: 20100141113Abstract: The present invention provides a blue phosphor that exhibits high luminance and shows less luminance degradation during driving of a light-emitting device. The present invention is a blue phosphor represented by the general formula aBaO.bSrO.(1?a?b)EuO.cMgO.dAlO3/2.eWO3, where 0.70?a?0.95, 0?b?0.15, 0.95?c?1.15, 9.00?d?11.00, 0.001?e?0.100, and a+b?0.97 are satisfied. In this blue phosphor, two peaks whose tops are located in a range of diffraction angle 2?=13.0 to 13.6 degrees are present in an X-ray diffraction pattern obtained by measurement on the blue phosphor using an X-ray with a wavelength of 0.774 ?.Type: ApplicationFiled: March 25, 2008Publication date: June 10, 2010Applicant: PANASONIC CORPORATIONInventors: Kojiro Okuyama, Yayoi Kitamura, Seigo Shiraishi, Kazuhiko Sugimoto, Mituru Harada
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Publication number: 20100052506Abstract: The present invention provides a blue phosphor having high luminance and showing less luminance degradation during driving of a light-emitting device. The present invention is a blue phosphor that includes: an alkaline earth metal aluminate represented by a general formula aBaO.bSrO.(1?a?b)EuO.cMgO.dAlO3/2, where 0.70?a?0.95, 0?b?0.15, 0.95?c?1.15, 9.00?d?11.00, and a+b?0.97 are satisfied; and 0.008 mol to 0.800 mol of MWO4 with respect to 1 mol of the aluminate, where M is at least one element selected from a group consisting of Ba, Sr, and Ca.Type: ApplicationFiled: March 25, 2008Publication date: March 4, 2010Applicant: PANASONIC CORPORATIONInventors: Kojiro Okuyama, Yayoi Kitamura, Seigo Shiraishi, Kazuhiko Sugimoto, Mituru Harada
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METHOD OF MANUFACTURING BLUE SILICATE PHOSPHOR, AND BLUE SILICATE PHOSPHOR AND LIGHT-EMITTING DEVICE
Publication number: 20090218926Abstract: The present invention provides a method of manufacturing a blue silicate phosphor having high luminance and a chromaticity y comparable to or lower than that of BAM:Eu. The present invention is a method of manufacturing a blue silicate phosphor represented by the general formula aAO.bEuO.(Mg1?w,Znw)O.cSiO2.dCaCl2, where A is at least one selected from Sr, Ba and Ca, and 2.970?a?3.500, 0.006?b?0.030, 1.900?c?2.100, 0?d?0.05, and 0?w?1 are satisfied. In this manufacturing method, heat treatment is carried out in a gas atmosphere having an oxygen partial pressure of 1×10?15.5 atm to 1×10?10 atm at a temperature of 1200° C. to 1400° C.Type: ApplicationFiled: May 16, 2007Publication date: September 3, 2009Applicant: PANASONIC CORPORATIONInventors: Seigo Shiraishi, Kojiro Okuyama, Masahiro Sakai, Takehiro Zukawa -
Publication number: 20090200945Abstract: The present invention provides a phosphor having high luminance, a property of low luminance degradation during driving of a light-emitting device, and chromaticity y comparable to that of BAM:Eu. The present invention is a phosphor represented by the general formula aAO.bEuO.DO.cSiO2, where A is at least one selected from Ca, Sr and Ba, D is at least one selected from Mg and Zn, and 2.970?a?3.500, 0.001?b?0.030, and 1.900?c?2.100 are satisfied. In this phosphor, a peak intensity at 1490 cm?1 is 0.02 to 0.8 when a peak intensity at 565 cm?1 is set to 1 in a spectrum obtained by measurement using photoacoustic spectroscopy.Type: ApplicationFiled: May 25, 2007Publication date: August 13, 2009Applicant: PANASONIC CORPORATIONInventors: Kojiro Okuyama, Masahiro Sakai, Seigo Shiraishi
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Publication number: 20090072704Abstract: The present invention provides a phosphor that has high luminance, a property of low luminance degradation during PDP driving, and chromaticity y comparable to that of BAM:Eu. The present invention is the phosphor that is represented by the general formula xAO.y1EuO.y2EuO3/2.DO.zSiO2 wherein A is at least one selected from Ca, Sr and Ba, D is at least one selected from Mg and Zn, and 2.970?x?3.500, 0.001?y1+y2?0.030, and 1.900?z?2.100 are satisfied, and that has 50 mol % or less of the divalent Eu ratio (ratio of the divalent Eu element to the total of the Eu elements) in the vicinity of the surface of the phosphor particle.Type: ApplicationFiled: April 14, 2006Publication date: March 19, 2009Applicant: Matsushita Electric Industrial Co., Ltd.Inventors: Kojiro Okuyama, Takehiro Zukawa, Masahiro Sakai, Seigo Shiraishi
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Publication number: 20090058254Abstract: The present invention provides a phosphor that has high luminance, a property of low luminance degradation during PDP driving, and chromaticity y comparable to that of BAM:Eu. The present invention is the phosphor that is represented by the general formula xAO.y1EuO.y2EuO3/2.DO.zSiO2.wCaCl2 wherein A is at least one selected from Sr and Ba, D is at least one selected from Mg and Zn, and 2.970?x?3.500, 0.001?y1+y2?0.030, 1.900?z?2.100, and 0.001?w?0.100 are satisfied, and that has 50 mol % or less of the divalent Eu ratio (ratio of the divalent Eu element to the total of the Eu elements) in the vicinity of the surface of the phosphor particle.Type: ApplicationFiled: April 14, 2006Publication date: March 5, 2009Applicant: Matsushita Electric Industrial Co., LTD.Inventors: Kojiro Okuyama, Takehiro Zukawa, Masahiro Sakai, Seigo Shiraishi
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Publication number: 20090021145Abstract: The present invention is a blue phosphor that is represented by a general formula xSrO.yEuO.MgO.zSiO2, where 2.970?x?3.500, 0.006?y?0.030, and 1.900?z?2.100. This blue phosphor has a crystal structure that is essentially a merwinite structure, and the crystal structure has a unit cell volume of 714.8 ?3 or less. Or, in this blue phosphor, a peak appearing around 2?=22.86 degrees in an X-ray diffraction pattern obtained by measurement of the blue phosphor using an X-ray with a wavelength of 0.773 ? has a one-fifth value width of 0.17 degrees or less. Furthermore, the present invention is a light-emitting device having a phosphor layer including the phosphor. A suitable example of the light-emitting device is a plasma display panel.Type: ApplicationFiled: February 7, 2007Publication date: January 22, 2009Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.Inventors: Masahiro Sakai, Seigo Shiraishi, Takehiro Zukawa, Kojiro Okuyama
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Publication number: 20080203893Abstract: The present invention is a light-emitting device which is provided with a phosphor layer containing a blue phosphor, wherein the phosphor layer includes an aluminate phosphor, as the blue phosphor, that contains Ba, Sr, Eu, Mg, Al and O as constituting elements at an atom-number ratio Ba:Sr:Eu:Mg:Al:O=p:q:r:1:w:17 wherein 0.70?p?0.95, 0?q?0.15, 0.05?r?0.20, p+q+r?1, and 9.8?w?10.5 are satisfied, and a value of a linear coupling function s represented by a formula: s=?11622+2043.07La+199.24L1?116.91L2 is 1 or less, when a lattice constant is La(?), an interatomic distance between Al(2) and O(5) is L1(?), and an interatomic distance between Al(1) and O(4) is L2(?), which are obtained by an X-ray crystal structure analysis assuming that the aluminate phosphor belongs to a space group P63/mmc.Type: ApplicationFiled: April 6, 2006Publication date: August 28, 2008Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.Inventors: Masahiro Sakai, Seigo Shiraishi, Takehiro Zukawa, Kojiro Okuyama, Junichi Hibino, Kazuhiko Sugimoto
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Patent number: 7285913Abstract: A plasma display device is provided in which deterioration in brightness of phosphor layers can be avoided. The plasma display device includes a plasma display panel in which a plurality of discharge cells in one color or in a plurality of colors are arranged and phosphor layers are arranged so as to correspond to the discharge cells in colors and in which light is emitted by exciting the phosphor layers with ultraviolet rays. The phosphor layers include blue phosphor, the blue phosphor being composed of an alkaline-earth metal aluminate phosphor containing at least one element selected from the group consisting of Mo and W. The addition of hexavalent ions (Mo, W) in the blue phosphor allows the elimination of oxygen defects in the vicinity of a layer containing Ba atoms (Ba—O layer), the suppression of adsorption of water to the surface of the blue phosphor and the improvement of deterioration in brightness and a change in chromaticity for the respective phosphors and discharge characteristics.Type: GrantFiled: August 26, 2004Date of Patent: October 23, 2007Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Kojiro Okuyama, Takehiro Zukawa, Masahiro Sakai, Seigo Shiraishi, Kazuhiko Sugimoto, Masaki Aoki, Junichi Hibino
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Patent number: 7238303Abstract: Phosphor and a plasma display device are provided whose deterioration in brightness of phosphors and a degree of change in chromaticity are alleviated and whose discharge characteristics are improved and that has excellent initial characteristics. Phosphor of the present invention is an alkaline-earth metal aluminate phosphor containing an element M (where M denotes at least one type of element selected from the group consisting of Nb, Ta, W and B). In this phosphor, a concentration of M in the vicinity of a surface of the phosphor particles is higher than the average concentration of M in the phosphor particles as a whole. A plasma display device according to the present invention includes a plasma display panel in which a plurality of discharge cells in one color or in a plurality of colors are arranged and phosphor layers are arranged so as to correspond to the discharge cells in colors and in which light is emitted by exciting the phosphor layers with ultraviolet rays.Type: GrantFiled: August 27, 2004Date of Patent: July 3, 2007Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Kojiro Okuyama, Takehiro Zukawa, Masahiro Sakai, Seigo Shiraishi, Kazuhiko Sugimoto, Masaki Aoki, Junichi Hibino
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Patent number: 7056853Abstract: An oxide ceramic material is provided to contain aluminum oxide as a principal component, and at least one selected from A and B shown below as an auxiliary component: A: niobium oxide and copper oxide B: copper oxide, titanium oxide, and silver oxide. With this, it is possible to provide an oxide ceramic material having sinterability at a low temperature and a high heat conductivity, as well as a ceramic substrate, a ceramic laminate device, and a power amplifier module employing the same.Type: GrantFiled: January 21, 2004Date of Patent: June 6, 2006Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Osamu Inoue, Kenji Harada, Kojiro Okuyama
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Patent number: 6989626Abstract: A compact and high-power piezoelectric transformer is realized by using higher order longitudinal extensional mode vibrations and increasing an effective electromechanical coupling factor by a primary electrode which consists of plural electrodes.Type: GrantFiled: July 20, 2004Date of Patent: January 24, 2006Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Katsu Takeda, Hiroshi Nakatsuka, Takeshi Yamaguchi, Kojiro Okuyama, Katsunori Moritoki
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Publication number: 20050062417Abstract: Phosphor and a plasma display device are provided whose deterioration in brightness of phosphors and a degree of change in chromaticity are alleviated and whose discharge characteristics are improved and that has excellent initial characteristics. Phosphor of the present invention is an alkaline-earth metal aluminate phosphor containing an element M (where M denotes at least one type of element selected from the group consisting of Nb, Ta, W and B). In this phosphor, a concentration of M in the vicinity of a surface of the phosphor particles is higher than the average concentration of M in the phosphor particles as a whole. A plasma display device according to the present invention includes a plasma display panel in which a plurality of discharge cells in one color or in a plurality of colors are arranged and phosphor layers are arranged so as to correspond to the discharge cells in colors and in which light is emitted by exciting the phosphor layers with ultraviolet rays.Type: ApplicationFiled: August 27, 2004Publication date: March 24, 2005Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.Inventors: Kojiro Okuyama, Takehiro Zukawa, Masahiro Sakai, Seigo Shiraishi, Kazuhiko Sugimoto, Masaki Aoki, Junichi Hibino
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Publication number: 20050046330Abstract: A plasma display device is provided in which deterioration in brightness of phosphor layers can be avoided. The plasma display device includes a plasma display panel in which a plurality of discharge cells in one color or in a plurality of colors are arranged and phosphor layers are arranged so as to correspond to the discharge cells in colors and in which light is emitted by exciting the phosphor layers with ultraviolet rays. The phosphor layers include blue phosphor, the blue phosphor being composed of an alkaline-earth metal aluminate phosphor containing at least one element selected from the group consisting of Mo and W. The addition of hexavalent ions (Mo, W) in the blue phosphor allows the elimination of oxygen defects in the vicinity of a layer containing Ba atoms (Ba—O layer), the suppression of adsorption of water to the surface of the blue phosphor and the improvement of deterioration in brightness and a change in chromaticity for the respective phosphors and discharge characteristics.Type: ApplicationFiled: August 26, 2004Publication date: March 3, 2005Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.Inventors: Kojiro Okuyama, Takehiro Zukawa, Masahiro Sakai, Seigo Shiraishi, Kazuhiko Sugimoto, Masaki Aoki, Junichi Hibino
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Patent number: 6835681Abstract: A dielectric ceramic composition containing a first component and a second component (25 to 80 wt %) is used. The first component is a complex oxide represented by Formula: xZrO2-yTiO2-zL(1+u)/3M(2−u)/3O2 (L is at least one element selected from the group consisting of Mg, Zn, Co, and Mn, and M is at least one element selected from the group consisting of Nb and Tb. x, y, z, and u are numerical values represented by x+y+z=1, 0.10≦x≦0.60, 0.20 ≦y≦0.60, 0.01≦z≦0.70, 0≦u≦1.90). The second component is a glass composition containing an oxide of at least one element selected from the group consisting of Si, B, Al, Ba, Ca, Sr, Zn, Ti, La, and Nd.Type: GrantFiled: December 19, 2001Date of Patent: December 28, 2004Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Kojiro Okuyama, Hiroshi Kagata, Junichi Kato, Hiroyuki Hase
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Publication number: 20040256960Abstract: A compact and high-power piezoelectric transformer is realized by using higher order longitudinal extensional mode vibrations and increasing an effective electromechanical coupling factor by a primary electrode which consists of plural electrodes.Type: ApplicationFiled: July 20, 2004Publication date: December 23, 2004Inventors: Katsu Takeda, Hiroshi Nakatsuka, Takeshi Yamaguchi, Kojiro Okuyama, Katsunori Moritoki
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Patent number: 6812623Abstract: A compact and high-power piezoelectric transformer is realized by using higher order longitudinal extensional mode vibrations and increasing an effective electromechanical coupling factor by a primary electrode which consists of plural electrodes.Type: GrantFiled: September 23, 2002Date of Patent: November 2, 2004Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Katsu Takeda, Hiroshi Nakatsuka, Takeshi Yamaguchi, Kojiro Okuyama, Katsunori Moritoki
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Patent number: 6794796Abstract: The piezoelectric transformer of the present invention has a piezoelectric element 109 mainly formed of a piezoelectric material, primary electrodes 101U and 101D which are formed on the piezoelectric element 109 and to which a voltage is applied, a secondary electrode 102 which is formed on the piezoelectric element 109 and from which a voltage higher than the voltage applied to the primary electrode is output, and a sensor electrode 103 which is formed on the piezoelectric element 109 and from which a voltage lower than the output voltage of the secondary electrode is output.Type: GrantFiled: January 9, 2003Date of Patent: September 21, 2004Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hiroshi Nakatsuka, Katsunori Moritoki, Toshiyuki Asahi, Kojiro Okuyama, Osamu Kawasaki
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Publication number: 20040151925Abstract: An oxide ceramic material is provided to contain aluminum oxide as a principal component, and at least one selected from A and B shown below as an auxiliary component:Type: ApplicationFiled: January 21, 2004Publication date: August 5, 2004Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.Inventors: Osamu Inoue, Kenji Harada, Kojiro Okuyama