Patents by Inventor Kazushige FUJIO
Kazushige FUJIO 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: 20200365772Abstract: A light emitting device includes a light emitting element having an emission peak wavelength in a range of 380 nm to 420 nm and a fluorescent member including at least one fluorescent material that is excited by light from the light emitting element for light emission, wherein a mixture of light from the light emitting element and light from the fluorescent material has a correlated color temperature in a range of 2000 K to 7500 K as measured according to JIS Z8725, and the light emitting device has a spectral distribution in which, when the integral value over a wavelength range of 380 nm to 780 nm is normalized to 100%, the proportion of an integral value over a wavelength range of 380 nm to 420 nm is 15% or more, and the ratio a as defined by the expression (1) is 0.9 or more and 1.6 or less.Type: ApplicationFiled: August 3, 2020Publication date: November 19, 2020Applicant: NICHIA CORPORATIONInventors: Makiko IWASA, Kazushige FUJIO
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Patent number: 10818827Abstract: A light-emitting device is provided. The light-emitting device includes a light-emitting element having a peak light-emitting wavelength in the range of 440 nm to 470 nm, and a fluorescent member. The fluorescent member includes a first fluorescent material having a peak light-emitting wavelength in the range of 480 nm to less than 520 nm, a second fluorescent material having a peak light-emitting wavelength in the range of 520 nm to less than 600 nm, and a third fluorescent material having a peak light-emitting wavelength in the range of 600 nm to 670 nm. The light-emitting device has a ratio of an effective radiant intensity for melatonin secretion suppression to an effective radiant intensity for blue-light retinal damage of 1.53 to 1.70 when the light-emitting device emits light with a correlated color temperature of 2700 K to less than 3500 K; 1.40 to 1.70 when the light-emitting device emits light with a correlated color temperature of 3500 K to less than 4500 K; 1.40 to 1.Type: GrantFiled: September 26, 2018Date of Patent: October 27, 2020Assignee: NICHIA CORPORATIONInventors: Kazushige Fujio, Masaki Kondo
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Publication number: 20200313045Abstract: A light emitting device includes a first light source containing a first light emitting element, and a second light source containing a second light emitting element and a second fluorescent material, the first light source emits light in a region that is demarcated in a chromaticity diagram of the CIE 1931 color coordinate system by a first straight line connecting a first point having x,y of 0.280,0.070 in the chromaticity coordinate and a second point having x,y of 0.280,0.500 in the chromaticity coordinate, a second straight line connecting the second point and a third point having x,y of 0.013,0.Type: ApplicationFiled: March 27, 2020Publication date: October 1, 2020Applicant: NICHIA CORPORATIONInventors: Kenji ASAI, Kazushige FUJIO
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Publication number: 20200287098Abstract: A light emitting device includes a light emitting element having an emission peak wavelength in a range of 380 nm or more and 490 nm or less, and a red fluorescent material which is excited by the light from the light emitting element to emit light having at least one light emission peak wavelength in a range of 580 nm or more and 680 nm or less, wherein a ratio of the photon flux R of red light in a range of 620 nm or more and 700 nm or less to the photon flux B of blue light in a range of 400 nm or more and 490 nm or less, R/B, is in a range of more than 20 and 200 or less.Type: ApplicationFiled: May 21, 2020Publication date: September 10, 2020Applicant: NICHIA CORPORATIONInventors: Mika AMIYA, Kazushige FUJIO, Sadakazu WAKUI
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Patent number: 10770628Abstract: A light emitting device includes a light emitting element having an emission peak wavelength in a range of 380 nm to 420 nm and a fluorescent member including at least one fluorescent material that is excited by light from the light emitting element for light emission, wherein a mixture of light from the light emitting element and light from the fluorescent material has a correlated color temperature in a range of 2000 K to 7500 K as measured according to JIS Z8725, and the light emitting device has a spectral distribution in which, when the integral value over a wavelength range of 380 nm to 780 nm is normalized to 100%, the proportion of an integral value over a wavelength range of 380 nm to 420 nm is 15% or more, and the ratio a as defined by the expression (1) is 0.9 or more and 1.6 or less.Type: GrantFiled: May 30, 2019Date of Patent: September 8, 2020Assignee: NICHIA CORPORATIONInventors: Makiko Iwasa, Kazushige Fujio
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Patent number: 10700243Abstract: A light emitting device includes a light emitting element having an emission peak wavelength in a range of 380 nm or more and 490 nm or less, and a red fluorescent material which is excited by the light from the light emitting element to emit light having at least one light emission peak wavelength in a range of 580 nm or more and 680 nm or less, wherein a ratio of the photon flux R of red light in a range of 620 nm or more and 700 nm or less to the photon flux B of blue light in a range of 400 nm or more and 490 nm or less, R/B, is in a range of more than 20 and 200 or less.Type: GrantFiled: March 13, 2019Date of Patent: June 30, 2020Assignee: NICHIA CORPORATIONInventors: Mika Amiya, Kazushige Fujio, Sadakazu Wakui
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Publication number: 20200105981Abstract: Provided is a light emitting device, comprising: a light emitting element including a light emission peak wavelength in a range of 440 nm or more and 470 nm or less; a first fluorescent material having a light emission peak wavelength in a range of 480 nm or more and 518 nm or less; a second fluorescent material having a light emission peak wavelength in a range of 510 nm or more and less than 590 nm and having an x value of the chromaticity coordinate in CIE1931 in a range of 0.27 or more and 0.40 or less; and a third fluorescent material having a light emission peak wavelength in a range of 590 nm or more and 670 nm or less. The light emitting device is capable of reducing the human eye fatigue and having a light emission spectrum with excellent visual work.Type: ApplicationFiled: September 27, 2019Publication date: April 2, 2020Applicant: NICHIA CORPORATIONInventors: Kazushige FUJIO, Sadakazu WAKUI
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Publication number: 20200008363Abstract: Provided is a light emitting device that includes a light emitting element having a light emission peak wavelength ranging from 380 nm to 490 nm, and a fluorescent material excited by light from the light emitting element and emitting light having at a light emission peak wavelength ranging from 580 nm or more to less than 680 nm. The light emitting device emits light having a ratio R/B of a photon flux density R to a photon flux density B ranging from 2.0 to 4.0 and a ratio R/FR of the photon flux density R to a photon flux density FR ranging from 0.7 to 13.0, the photon flux density R being in a wavelength range of 620 nm or more and less than 700 nm, the photon flux density B being in a wavelength range of 380 nm or more and 490 nm or less, and the photon flux density FR being in a wavelength range of 700 nm or more and 780 nm or less.Type: ApplicationFiled: September 16, 2019Publication date: January 9, 2020Applicant: NICHIA CORPORATIONInventors: Mika AMIYA, Kazushige FUJIO, Tomokazu SUZUKI
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Publication number: 20190371978Abstract: A light emitting device includes a light emitting element having an emission peak wavelength in a range of 380 nm to 420 nm and a fluorescent member including at least one fluorescent material that is excited by light from the light emitting element for light emission, wherein a mixture of light from the light emitting element and light from the fluorescent material has a correlated color temperature in a range of 2000 K to 7500 K as measured according to JIS Z8725, and the light emitting device has a spectral distribution in which, when the integral value over a wavelength range of 380 nm to 780 nm is normalized to 100%, the proportion of an integral value over a wavelength range of 380 nm to 420 nm is 15% or more, and the ratio a as defined by the expression (1) is 0.9 or more and 1.6 or less.Type: ApplicationFiled: May 30, 2019Publication date: December 5, 2019Applicant: NICHIA CORPORATIONInventors: Makiko IWASA, Kazushige FUJIO
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Publication number: 20190371972Abstract: A light emitting device includes: a light emitting element having an emission peak wavelength in a range of 430 nm to 470 nm; and a fluorescent member including a fluorescent material that is excited by light from the light emitting element for light emission, wherein a mixture of light from the light emitting element and light from the fluorescent material has a correlated color temperature in a range of 1500 K to 11000 K, as measured according to JIS Z8725, the color deviation duv that is a deviation from the black body radiation track on the CIE1931 chromaticity diagram of the mixture of light and is measured according to JIS Z8725 falls within a range of more than 0 to 0.Type: ApplicationFiled: May 29, 2019Publication date: December 5, 2019Applicant: NICHIA CORPORATIONInventors: Kenji ASAI, Kazushige FUJIO
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Patent number: 10455773Abstract: Provided is a light emitting device that includes a light emitting element having a light emission peak wavelength ranging from 380 nm to 490 nm, and a fluorescent material excited by light from the light emitting element and emitting light having at a light emission peak wavelength ranging from 580 nm or more to less than 680 nm. The light emitting device emits light having a ratio R/B of a photon flux density R to a photon flux density B ranging from 2.0 to 4.0 and a ratio R/FR of the photon flux density R to a photon flux density FR ranging from 0.7 to 13.0, the photon flux density R being in a wavelength range of 620 nm or more and less than 700 nm, the photon flux density B being in a wavelength range of 380 nm or more and 490 nm or less, and the photon flux density FR being in a wavelength range of 700 nm or more and 780 nm or less.Type: GrantFiled: June 27, 2017Date of Patent: October 29, 2019Assignee: NICHIA CORPORATIONInventors: Mika Amiya, Kazushige Fujio, Tomokazu Suzuki
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Publication number: 20190288165Abstract: A light emitting device includes a light emitting element having an emission peak wavelength in a range of 380 nm or more and 490 nm or less, and a red fluorescent material which is excited by the light from the light emitting element to emit light having at least one light emission peak wavelength in a range of 580 nm or more and 680 nm or less, wherein a ratio of the photon flux R of red light in a range of 620 nm or more and 700 nm or less to the photon flux B of blue light in a range of 400 nm or more and 490 nm or less, R/B, is in a range of more than 20 and 200 or less.Type: ApplicationFiled: March 13, 2019Publication date: September 19, 2019Applicant: NICHIA CORPORATIONInventors: Mika AMIYA, Kazushige FUJIO, Sadakazu WAKUI
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Publication number: 20190165221Abstract: Provided are a light emitting device and an illumination device.Type: ApplicationFiled: November 28, 2018Publication date: May 30, 2019Applicant: NICHIA CORPORATIONInventors: Mika Amiya, Kazushige Fujio, Tomokazu Suzuki
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Publication number: 20190097098Abstract: A light-emitting device is provided. The light-emitting device includes a light-emitting element having a peak light-emitting wavelength in the range of 440 nm to 470 nm, and a fluorescent member. The fluorescent member includes a first fluorescent material having a peak light-emitting wavelength in the range of 480 nm to less than 520 nm, a second fluorescent material having a peak light-emitting wavelength in the range of 520 nm to less than 600 nm, and a third fluorescent material having a peak light-emitting wavelength in the range of 600 nm to 670 nm. The light-emitting device has a ratio of an effective radiant intensity for melatonin secretion suppression to an effective radiant intensity for blue-light retinal damage of 1.53 to 1.70 when the light-emitting device emits light with a correlated color temperature of 2700 K to less than 3500 K; 1.40 to 1.70 when the light-emitting device emits light with a correlated color temperature of 3500 K to less than 4500 K; 1.40 to 1.Type: ApplicationFiled: September 26, 2018Publication date: March 28, 2019Applicant: NICHIA CORPORATIONInventors: Kazushige FUJIO, Masaki KONDO
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Patent number: 10153405Abstract: A method for producing a fluorescent material is provided. The method includes preparing fluorescent material particles that contain an alkaline earth metal aluminate having a composition represented by (Sr1?x,Eux)4Al14O25, where x satisfies 0.05?x?0.4, and a part of Sr may be substituted by at least one element selected from the group consisting of Mg, Ca, Ba, and Zn; causing the prepared fluorescent material particles to come into contact with a liquid medium containing water; removing at least a portion of the contacted liquid medium to obtain purified fluorescent material particles; causing a phosphate compound to adhere to surfaces of the purified fluorescent material particles to obtain fluorescent material particles to which the phosphate compound is adhered; and heat treating the fluorescent material particles to which the phosphate compound is adhered at 500° C. to 700° C.Type: GrantFiled: February 23, 2017Date of Patent: December 11, 2018Assignee: NICHIA CORPORATIONInventors: Kazushige Fujio, Masaki Kondo
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Publication number: 20180000016Abstract: Provided is a light emitting device that includes a light emitting element having a light emission peak wavelength ranging from 380 nm to 490 nm, and a fluorescent material excited by light from the light emitting element and emitting light having at a light emission peak wavelength ranging from 580 nm or more to less than 680 nm. The light emitting device emits light having a ratio R/B of a photon flux density R to a photon flux density B ranging from 2.0 to 4.0 and a ratio R/FR of the photon flux density R to a photon flux density FR ranging from 0.7 to 13.0, the photon flux density R being in a wavelength range of 620 nm or more and less than 700 nm, the photon flux density B being in a wavelength range of 380 nm or more and 490 nm or less, and the photon flux density FR being in a wavelength range of 700 nm or more and 780 nm or less.Type: ApplicationFiled: June 27, 2017Publication date: January 4, 2018Applicant: NICHIA CORPORATIONInventors: Mika AMIYA, Kazushige FUJIO, Tomokazu SUZUKI
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Publication number: 20170250321Abstract: A method for producing a fluorescent material is provided. The method includes preparing fluorescent material particles that contain an alkaline earth metal aluminate having a composition represented by (Sr1?x,Eux)4Al14O25, where x satisfies 0.05?x?0.4, and a part of Sr may be substituted by at least one element selected from the group consisting of Mg, Ca, Ba, and Zn; causing the prepared fluorescent material particles to come into contact with a liquid medium containing water; removing at least a portion of the contacted liquid medium to obtain purified fluorescent material particles; causing a phosphate compound to adhere to surfaces of the purified fluorescent material particles to obtain fluorescent material particles to which the phosphate compound is adhered; and heat treating the fluorescent material particles to which the phosphate compound is adhered at 500° C. to 700° C.Type: ApplicationFiled: February 23, 2017Publication date: August 31, 2017Applicant: NICHIA CORPORATIONInventors: Kazushige FUJIO, Masaki KONDO
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Patent number: 9670403Abstract: A fluoride fluorescent material, comprising: a fluoride particles having a chemical composition represented by the formula (I): A2[M1?aMn4+aF6]??(I) wherein A is at least one cation selected from the group consisting of K+, Li+, Na+, Rb+, Cs+ and NH4+; M is at least one element selected from the group consisting of elements from Group 4 of the periodic table and elements from Group 14 of the periodic table; and variable a satisfies 0<a<0.2; and a thermally-conductive substance having a higher thermal conductivity than the fluoride particles, and that is arranged on at least a portion of a surface of the fluoride particles, and a method for producing the fluoride fluorescent material.Type: GrantFiled: December 23, 2014Date of Patent: June 6, 2017Assignee: NICHIA CORPORATIONInventors: Koji Kajikawa, Kazushige Fujio
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Publication number: 20150184067Abstract: A fluoride fluorescent material, comprising: a fluoride particles having a chemical composition represented by the formula (I): A2[M1-aMn4+aF6]??(I) wherein A is at least one cation selected from the group consisting of K+, Li+, Na+, Rb+, Cs+ and NH4+; M is at least one element selected from the group consisting of elements from Group 4 of the periodic table and elements from Group 14 of the periodic table; and variable a satisfies 0<a<0.2; and a thermally-conductive substance having a higher thermal conductivity than the fluoride particles, and that is arranged on at least a portion of a surface of the fluoride particles, and a method for producing the fluoride fluorescent material.Type: ApplicationFiled: December 23, 2014Publication date: July 2, 2015Inventors: Koji KAJIKAWA, Kazushige FUJIO