Patents by Inventor Takehiro Zukawa
Takehiro Zukawa 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: 20230096157Abstract: A cooking device top plate according to the present disclosure comprises: a crystallized glass substrate containing Li2O-Al2O3-SiO2 as a main component and a transition element; and a substrate color improving layer provided on a lower surface of the crystallized glass substrate, the substrate color improving layer containing a blue pigment and including a brightness enhancing layer having a refractive index smaller than that of the crystallized glass substrate or not less than (a refractive index of the crystallized glass substrate+0.1).Type: ApplicationFiled: February 17, 2021Publication date: March 30, 2023Inventors: Takehiro ZUKAWA, Narutoshi KANAZAWA
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Publication number: 20210000355Abstract: A stress evaluation device includes a first sensor that measures a heart rate and a heart rate variability of a measurement subject; a calculator that calculates (i) an amount of change in heart rate and (ii) an amount of change in heart rate variability; and a determiner that determines a factor for stress of the measurement subject in accordance with the (i) and the (ii) and that outputs a determination result. The amount of change in heart rate is an amount of change from a reference value to the measured heart rate. The amount of change in heart rate variability is an amount of change from a reference value to the measured heart rate variability. The determiner makes (I) a comparison between the (i) and a first threshold, and (II) a comparison between the (ii) and a second threshold to determine the factor for the stress.Type: ApplicationFiled: September 23, 2020Publication date: January 7, 2021Inventors: TAKEHIRO ZUKAWA, YUKIHIRO MORITA
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Patent number: 9691599Abstract: An ultraviolet light emitting device comprises: a first substrate having a main surface; a second substrate facing the main surface of the first substrate; a gas in a space between the first substrate and the second substrate; electrodes directly or indirectly on the main surface of the first substrate; a dielectric layer that is located directly or indirectly on the main surface of the first substrate and covers the electrodes; and a first light-emitting layer. The first light-emitting layer is located directly or indirectly on the dielectric layer and emits ultraviolet light in the gas due to electrical discharge between the electrodes. The first light-emitting layer is thicker in first regions on the dielectric layer than in second regions. The second regions include at least part of regions directly above the electrodes.Type: GrantFiled: March 17, 2016Date of Patent: June 27, 2017Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventors: Takehiro Zukawa, Yoshiki Sasaki, Nobuaki Nagao
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Patent number: 9691600Abstract: An ultraviolet light emitting device includes: a first substrate; a second substrate; a gas in a space between the first substrate and the second substrate; electrodes directly or indirectly on a first main surface of the first substrate; a dielectric layer that is located in a first region directly or indirectly on the first main surface of the first substrate and covers the electrodes, the dielectric layer being not located in a second region directly or indirectly on the first main surface of the first substrate, the second region being different from the first region, the first region including regions in which the electrodes are located; and a light-emitting layer that is located in the second region and/or located directly or indirectly on at least one of second and third main surfaces of the second substrate and emits the ultraviolet light in the gas due to electrical discharge between the electrodes.Type: GrantFiled: March 17, 2016Date of Patent: June 27, 2017Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Takehiro Zukawa, Yoshiki Sasaki, Nobuaki Nagao
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Patent number: 9649401Abstract: An ultraviolet irradiation apparatus includes: a first substrate; a second substrate; electrodes disposed directly or indirectly on the first substrate; a dielectric layer covering the electrodes; a sealant joining together the first and second substrates; a light-emitting layer that is disposed directly or indirectly on the dielectric layer and/or a surface of the second substrate; and a reaction vessel disposed directly or indirectly on a surface of the second substrate. The reaction vessel includes a tubular structure, an inlet channel and an outlet channel. The tubular structure has a ratio ha/hc of 5 to 10, where ha is a diameter of a circle inscribed in an inner bottom surface of the tubular structure, and hc is an inner height of the tubular structure.Type: GrantFiled: May 9, 2016Date of Patent: May 16, 2017Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Nobuaki Nagao, Takehiro Zukawa, Yoshiki Sasaki
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Publication number: 20160339138Abstract: An ultraviolet irradiation apparatus includes: a first substrate; a second substrate; electrodes disposed directly or indirectly on the first substrate; a dielectric layer covering the electrodes; a sealant joining together the first and second substrates; a light-emitting layer that is disposed directly or indirectly on the dielectric layer and/or a surface of the second substrate; and a reaction vessel disposed directly or indirectly on a surface of the second substrate. The reaction vessel includes a tubular structure, an inlet channel and an outlet channel. The tubular structure has a ratio ha/hc of 5 to 10, where ha is a diameter of a circle inscribed in an inner bottom surface of the tubular structure, and hc is an inner height of the tubular structure.Type: ApplicationFiled: May 9, 2016Publication date: November 24, 2016Inventors: NOBUAKI NAGAO, TAKEHIRO ZUKAWA, YOSHIKI SASAKI
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Publication number: 20160300705Abstract: An ultraviolet light emitting device includes: a first substrate; a second substrate; a gas in a space between the first substrate and the second substrate; electrodes directly or indirectly on a first main surface of the first substrate; a dielectric layer that is located in a first region directly or indirectly on the first main surface of the first substrate and covers the electrodes, the dielectric layer being not located in a second region directly or indirectly on the first main surface of the first substrate, the second region being different from the first region, the first region including regions in which the electrodes are located; and a light-emitting layer that is located in the second region and/or located directly or indirectly on at least one of second and third main surfaces of the second substrate and emits the ultraviolet light in the gas due to electrical discharge between the electrodes.Type: ApplicationFiled: March 17, 2016Publication date: October 13, 2016Inventors: TAKEHIRO ZUKAWA, YOSHIKI SASAKI, NOBUAKI NAGAO
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Publication number: 20160300704Abstract: An ultraviolet light emitting device comprises: a first substrate having a main surface; a second substrate facing the main surface of the first substrate; a gas in a space between the first substrate and the second substrate; electrodes directly or indirectly on the main surface of the first substrate; a dielectric layer that is located directly or indirectly on the main surface of the first substrate and covers the electrodes; and a first light-emitting layer. The first light-emitting layer is located directly or indirectly on the dielectric layer and emits ultraviolet light in the gas due to electrical discharge between the electrodes. The first light-emitting layer is thicker in first regions on the dielectric layer than in second regions. The second regions include at least part of regions directly above the electrodes.Type: ApplicationFiled: March 17, 2016Publication date: October 13, 2016Inventors: TAKEHIRO ZUKAWA, YOSHIKI SASAKI, NOBUAKI NAGAO
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Publication number: 20120326598Abstract: PDP (1) includes front plate (2) and rear plate (10). Front plate (2) has protective layer (9). Rear plate (10) has phosphor layers (15). Protective layer (9) includes a first metal oxide and a second metal oxide. In X-ray diffraction analysis, a peak of a base layer lies between a first peak of the first metal oxide and a second peak of the second metal oxide. The first and second metal oxides are two selected from the group consisting of MgO, CaO, SrO, and BaO. The concentration of calcium contained in the base layer ranges from not less than 1 atomic % to not greater than 5 atomic %. In X-ray diffraction analysis, the metal oxide exhibits one peak that lies between the minimum and the maximum of diffraction angles of single substances of the selected metal oxides in a specific plane direction (111).Type: ApplicationFiled: March 15, 2011Publication date: December 27, 2012Applicant: Panasonic CorporationInventors: Jun Hashimoto, Takehiro Zukawa, Takuji Tsujita, Takayuki Shimamura
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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 -
Publication number: 20120052761Abstract: A method for producing a plasma display panel including a base layer containing a metal oxide, and aggregated particles dispersed on the base layer includes the following process. A protective layer is formed on a dielectric layer. Then, a surface of the protective layer is sputtered. In addition, concentration ratios of a first metal oxide and a second metal oxide in the surface of the protective layer are changed by re-depositing a component of the sputtered protective layer.Type: ApplicationFiled: March 16, 2011Publication date: March 1, 2012Inventors: Hai Lin, Takehiro Zukawa, Eiji Takeda, Tasuku Ishibashi, Kyohei Yoshino, Kazuya Nomoto, Takuji Tsujita
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Publication number: 20120049730Abstract: A plasma display panel includes a front plate, a rear plate, and a bonding layer to bond the front plate to the rear plate. The front plate has a protective layer. The rear plate has a barrier rib. The protective layer includes a base layer. Aggregated particles are dispersed all over the base layer. The base layer contains a first metal oxide and a second metal oxide. Through an X-ray diffraction analysis, a peak of the base layer exists between a first peak of the first metal oxide, and a second peak of the second metal oxide. The first metal oxide and the second metal oxide are two kinds of oxides selected from a group consisting of MgO, CaO, SrO, and BaO. The rear plate has a barrier rib. The bonding layer bonds at least one part of the barrier rib to the protective layer.Type: ApplicationFiled: March 7, 2011Publication date: March 1, 2012Inventors: Takehiro Zukawa, Hai Lin, Tasuku Ishibashi, Kyohei Yoshino, Kazuya Nomoto, Takuji Tsujita
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Publication number: 20120013248Abstract: A PDP has a front plate and a rear plate. The front plate includes a protective layer, and the rear plate includes phosphor layers. The protective layer includes a base layer. Agglomerated particles are dispersed on the base layer. The base layer includes a first metallic oxide and a second metallic oxide. The base layer has a peak through an X-ray diffraction analysis between a first peak of the first metallic oxide and a second peak of the second metallic oxide. The first metallic oxide and the second metallic oxide are two selected from a group consisting of MgO, CaO, SrO, and BaO. The phosphor layers include particles of a platinum group element.Type: ApplicationFiled: February 24, 2011Publication date: January 19, 2012Inventors: Kyohei Yoshino, Takuji Tsujita, Takehiro Zukawa, Keiji Horikawa
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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: 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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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: 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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Patent number: 7468145Abstract: The present invention aims at realizing a PDP and a mercury-free fluorescent lamp feasible to maintain excellent luminescent characteristics over long periods by suppressing time-lapse changes in luminescent characteristics of a phosphor that is excited by vacuum ultraviolet light to thereby emit light. To accomplish this object, the oxide phosphor of the invention comprises individual particles, each of which has a region at and near the surface thereof modified, and the elemental composition of the surface region is in a more oxidized state than that of the internal region of the particles. Alternatively, the surface region has more halogen or chalcogen in the elemental composition. In the phosphor treatment method of the invention, the surface region of individual phosphor particles is selectively modified by (i) forming a highly reactive gas atmosphere by exciting gas which contains reactive gas, and (ii) exposing the phosphor to the gas atmosphere.Type: GrantFiled: October 7, 2003Date of Patent: December 23, 2008Assignee: Panasonic CorporationInventors: Takehiro Zukawa, Masatoshi Kitagawa, Masaharu Terauchi, Junko Asayama