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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Patent number: 8361347Abstract: The blue phosphor of the present invention includes ZrO2 and a metal aluminate that is 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?0.200, and a+b?0.97 are satisfied. This blue phosphor has a ZrO2 content of 0.01 to 1.00% by weight. In the blue phosphor of the present invention, 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: GrantFiled: July 3, 2009Date of Patent: January 29, 2013Assignee: Panasonic CorporationInventors: Kojiro Okuyama, Yayoi Okui, Seigo Shiraishi
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Publication number: 20120299461Abstract: The present disclosure is a plasma display panel including a green phosphor layer. In this plasma display panel, the green phosphor layer includes a phosphor represented by a general formula: aYO3/2.(3?a)CeO3/2.bAlO3/2.cGaO3/2, where 2.80?a?2.99, 1.00?b?5.00, 0?c?4.00, and 4.00?b+c?5.00 are satisfied. In this phosphor, a peak whose peak top is located in a range of diffraction angle 2? of not less than 16.7 degrees but not more than 16.9 degrees is present in an X-ray diffraction pattern obtained by measurement on the phosphor using an X-ray with a wavelength of 0.774 ?. The green phosphor layer also includes a phosphor represented by a general formula: dZnO.(2?d)MnO.eSiO2, where 1.80?d?1.90 and 1.00?e?1.02 are satisfied, in an amount of 30 wt % or more and 80 wt % or less of the total weight of green phosphors.Type: ApplicationFiled: August 8, 2012Publication date: November 29, 2012Applicant: PANASONIC CORPORATIONInventor: Kojiro OKUYAMA
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Patent number: 8236201Abstract: The present invention provides a phosphor having high luminance, a property of low luminance degradation during driving of a light-emitting device and manufacturing processes, and chromaticity y in PDP comparable to that of BAM:Eu. The present invention is the phosphor represented by the general formula xSrO.yEuO.MgO.zSiO2 where 2.970?x?3.500, 0.001 ?y?0.030, and 1.900?z?2.100 are satisfied, wherein a main peak is present in the range of diffraction angle 2?=16.1 to 16.5 degree in the X-ray diffraction pattern obtained by measurement on the blue phosphor using an X-ray with a wavelength of 0.774 ?, and at least one condition of the following conditions (A1) and (A2) is satisfied: (A1) at least two peaks whose tops are located in the range of diffraction angle 2?=15.3 to 16.1 degree are present; and (A2) at least two peaks whose tops are located in the range of diffraction angle 2?=22.2 to 23.3 degree are present.Type: GrantFiled: March 28, 2008Date of Patent: August 7, 2012Assignee: Panasonic CorporationInventors: Yayoi Kitamura, Seigo Shiraishi, Kojiro Okuyama, Masahiro Sakai
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Publication number: 20120181480Abstract: 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: July 11, 2011Publication date: July 19, 2012Applicant: PANASONIC CORPORATIONInventors: Kojiro OKUYAMA, Yayoi KITAMURA, Seigo SHIRAISHI, Kazuhiko SUGIMOTO, Mituru HARADA
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Patent number: 8183778Abstract: The present invention provides a phosphor with high luminance and color purity. The phosphor of the present invention is represented by the general formula: aYO3/2·(3?a)CeO3/2·bAlO3/2·cGaO3/2, where 2.80?a?2.99, 1.00?b?5.00, 0?c?4.00, and 4.00?b+c?5.00 are satisfied. In the phosphor, a peak whose peak top is located in the range of diffraction angle 2? of not less than 16.7 degrees but not more than 16.9 degrees is present in an X-ray diffraction pattern obtained by measurement on the phosphor using an X-ray with a wavelength of 0.774 ?.Type: GrantFiled: April 9, 2010Date of Patent: May 22, 2012Assignee: Panasonic CorporationInventors: Kojiro Okuyama, Yayoi Okui, Seigo Shiraishi
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Patent number: 8169143Abstract: A plasma display panel (200) of the present invention includes a first panel (1) and a second panel (8). A discharge space (14) is formed between the first panel (1) and the second panel (8). In the plasma display panel (200), an electron emitting material (20) is disposed to face the discharge space (14). The electron emitting material (20) contains Sn, an alkali metal, O (oxygen), and at least one element selected from the group consisting of Ca, Sr, and Ba.Type: GrantFiled: July 22, 2009Date of Patent: May 1, 2012Assignee: Panasonic CorporationInventors: Yayoi Okui, Osamu Inoue, Kojiro Okuyama, Seigo Shiraishi
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Method of manufacturing blue silicate phosphor, and blue silicate phosphor and light-emitting device
Patent number: 8142684Abstract: 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: GrantFiled: May 16, 2007Date of Patent: March 27, 2012Assignee: Panasonic CorporationInventors: Seigo Shiraishi, Kojiro Okuyama, Masahiro Sakai, Takehiro Zukawa -
Patent number: 8129905Abstract: 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: GrantFiled: May 25, 2007Date of Patent: March 6, 2012Assignee: Panasonic CorporationInventors: Kojiro Okuyama, Masahiro Sakai, Seigo Shiraishi
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Patent number: 8040063Abstract: 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: GrantFiled: March 25, 2008Date of Patent: October 18, 2011Assignee: Panasonic CorporationInventors: Kojiro Okuyama, Yayoi Kitamura, Seigo Shiraishi, Kazuhiko Sugimoto, Mituru Harada
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Publication number: 20110198985Abstract: The present invention aims to drive a PDP at low voltage by providing a material with a high secondary electron emission coefficient under a practical manufacturing condition. In order to achieve the aim, a crystalline oxide selected from the group consisting of CaSnO3, SrSnO3, BaSnO3, and a solid solution of two or more of them, in which an amount of Ca, Sr or Ba in a surface region thereof is reduced, is used as a material for a protective film when a plasma display panel is produced.Type: ApplicationFiled: April 1, 2010Publication date: August 18, 2011Inventors: Osamu Inoue, Hiroshi Asano, Yayol Okui, Kojiro Okuyama
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Publication number: 20110193474Abstract: A material suitable for improving the secondary electron emission coefficient of PDPs is provided to thereby enable a PDP to operate at a higher efficiency. Provided is a PDP (200) which includes a protective layer (7) formed by MgO and electron-emitting particles constituted of a crystalline compound dispersed on the protective layer (7) to form an electron emission layer (20). The electron-emitting particles are a crystalline compound whose primary components are indium, oxygen, and one or more selected from the group consisting of calcium, strontium, barium, and rare earth metals.Type: ApplicationFiled: January 14, 2010Publication date: August 11, 2011Inventors: Osamu Inoue, Hiroshi Asano, Yayoi Okui, Kojiro Okuyama, Seigo Shiraishi
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Publication number: 20110175554Abstract: The present invention aims to provide a plasma display panel that can be driven at low voltage and can offer favorable image display performance. In order to achieve the aim, on a surface of the front panel 1 on which the display electrode 5 is formed, the protective layer 7 made by using a crystalline oxide material that contains a crystalline oxide selected from the group consisting of (i) at least one of SrCeO3 and BaCeO3 and (ii) a solid solution of SrCeO3 and BaCeO3 is disposed so as to face the discharge space 14. By using the crystalline oxide material that contains the crystalline oxide selected from the group consisting of (i) at least one of SrCeO3 and BaCeO3 and (ii) a solid solution of SrCeO3 and BaCeO3, chemical stability can be improved without reducing secondary electron emission efficiency. A PDP capable of lowering drive voltage compared with a case where MgO is used can be obtained by using the crystalline oxide material.Type: ApplicationFiled: March 29, 2010Publication date: July 21, 2011Inventors: Osamu Inoue, Hiroshi Asano, Yayoi Okui, Kojiro Okuyama
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Publication number: 20110163657Abstract: The present invention provides a phosphor with less luminance degradation that includes an oxide that is excellent in chemical stability and allows the electrostatic charge of the phosphor surface to shift toward positive direction. The present invention is a phosphor including a phosphor body and a composite oxide on at least a part of the surface of the phosphor body. The composite oxide contains M, Sn, and O, and M is at least one element selected from the group consisting of Ca, Sr, and Ba.Type: ApplicationFiled: May 12, 2010Publication date: July 7, 2011Applicant: PANASONIC CORPORATIONInventors: Yayoi Okui, Osamu Inoue, Kojiro Okuyama, Seigo Shiraishi
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Publication number: 20110068680Abstract: The present invention provides a phosphor with high luminance and color purity. The phosphor of the present invention is represented by the general formula: aYO3/2·(3?a)CeO3/2·bAlO3/2·cGaO3/2, where 2.80?a?2.99, 1.00?b?5.00, 0?c?4.00, and 4.00?b+c?5.00 are satisfied. In the phosphor, a peak whose peak top is located in the range of diffraction angle 2? of not less than 16.7 degrees but not more than 16.9 degrees is present in an X-ray diffraction pattern obtained by measurement on the phosphor using an X-ray with a wavelength of 0.774 ?.Type: ApplicationFiled: April 9, 2010Publication date: March 24, 2011Applicant: Panasonic CorporationInventors: Kojiro Okuyama, Yayoi Okui, Seigo Shiraishi
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Patent number: 7902756Abstract: 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: GrantFiled: February 7, 2007Date of Patent: March 8, 2011Assignee: Panasonic CorporationInventors: Masahiro Sakai, Seigo Shiraishi, Takehiro Zukawa, Kojiro Okuyama
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Publication number: 20100259466Abstract: The present invention aims to improve efficiency of a PDP by providing a material suitable for improving a secondary electron emission coefficient of the PDP. In order to achieve the aim, in a PDP 200, an electron emission layer 20 is formed by dispersing electron emissive particles including a crystalline compound on a protective layer 7 made of MgO. The crystalline compound is, for example, CaSnO3, SrSnO3, BaSnO3, or a solid solution of two or more of them (e.g. (Ca, Sr)SnO3 and (Sr, Ba)SnO3).Type: ApplicationFiled: December 25, 2008Publication date: October 14, 2010Inventors: Osamu Inoue, Hiroshi Asano, Yayoi Okui, Kojiro Okuyama, Seigo Shiraishi, Yukihiro Morita, Kyohei Yoshino, Masanori Miura
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Publication number: 20100259158Abstract: A plasma display panel (200) of the present invention includes a first panel (1) and a second panel (8). A discharge space (14) is formed between the first panel (1) and the second panel (8). In the plasma display panel (200), an electron emitting material (20) is disposed to face the discharge space (14). The electron emitting material (20) contains Sn, an alkali metal, O (oxygen), and at least one element selected from the group consisting of Ca, Sr, and Ba.Type: ApplicationFiled: July 22, 2009Publication date: October 14, 2010Applicant: PANASONIC CORPORATIONInventors: Yayoi Okui, Osamu Inoue, Kojiro Okuyama, Seigo Shiraishi
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Publication number: 20100237764Abstract: The blue phosphor of the present invention includes ZrO2 and a metal aluminate that is 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?0.200, and a+b?0.97 are satisfied. This blue phosphor has a ZrO2 content of 0.01 to 1.00% by weight. In the blue phosphor of the present invention, 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: July 3, 2009Publication date: September 23, 2010Applicant: PANASONIC CORPORATIONInventors: Kojiro Okuyama, Yayoi Okui, Seigo Shiraishi
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Publication number: 20100237765Abstract: The blue phosphor of the present invention is 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?0.200, and a+b?0.97 are satisfied. In the blue phosphor of the present invention, two peaks whose tops are located in a range of diffraction angle 2?=13.0 to 13.6 degrees and one peak whose top is located in a range of diffraction angle 2?=14.6 to 14.8 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: July 3, 2009Publication date: September 23, 2010Applicant: PANASONIC CORPORATIONInventors: Kojiro Okuyama, Yayoi Okui, Seigo Shiraishi
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Publication number: 20100164360Abstract: The present invention provides a phosphor having high luminance, a property of low luminance degradation during driving of a light-emitting device and manufacturing processes, and chromaticity y in PDP comparable to that of BAM:Eu. The present invention is the phosphor represented by the general formula xSrO.yEuO.MgO.zSiO2 where 2.970?x?3.500, 0.001?y?0.030, and 1.900?z?2.100 are satisfied, wherein a main peak is present in the range of diffraction angle 2?=16.1 to 16.5 degree in the X-ray diffraction pattern obtained by measurement on the blue phosphor using an X-ray with a wavelength of 0.774 ?, and at least one condition of the following conditions (A1) and (A2) is satisfied: (A1) at least two peaks whose tops are located in the range of diffraction angle 2?=15.3 to 16.1 degree are present; and (A2) at least two peaks whose tops are located in the range of diffraction angle 2?=22.2 to 23.3 degree are present.Type: ApplicationFiled: March 28, 2008Publication date: July 1, 2010Applicant: PANASONIC CORPORATIONInventors: Yayoi Kitamura, Seigo Shiraishi, Kojiro Okuyama, Masahiro Sakai