Patents by Inventor Kazuhiko Kagawa
Kazuhiko Kagawa 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: 8829778Abstract: A white light-emitting semiconductor device having improved reproducibility of bright red. The device outputs light having a blue component, a green component, and a red component. Each of the light components (blue, green, and red) is based on a light-emitting semiconductor element and/or a phosphor that absorbs light emitted by a light-emitting semiconductor element and emits light through wavelength conversion. The outputted light has a spectrum which has a maximum wavelength in the range of 615-645 nm, and the intensity at a wavelength of 580 nm of the outputted light, which has been normalized with respect to luminous flux, is 80-100% of the intensity at a wavelength of 580 nm of standard light for color rendering evaluation, which has been normalized with respect to luminous flux.Type: GrantFiled: September 30, 2013Date of Patent: September 9, 2014Assignee: Mitsubishi Chemical CorporationInventors: Hiroaki Sakuta, Kazuhiko Kagawa, Yoshihito Satou, Hiroaki Okagawa, Shin Hiraoka
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Patent number: 8829780Abstract: The invention aims at providing controllable parameters that are correlated with special color rendering index R9, and at providing a white-light emitting semiconductor device having a high R9 value obtained through optimization of such parameters. The white-light emitting semiconductor device is provided with a phosphor as a light-emitting material and with a light-emitting semiconductor element as an excitation source of the phosphor. The phosphor includes at least a green phosphor and a wide-band red phosphor. In the white light-emitting semiconductor device, an intensity at wavelength 640 nm of an emission spectrum which has been normalized with respect to luminous flux is 100-110% of the intensity at wavelength 640 nm of a spectrum of standard light for color rendering evaluation which has been normalized with respect to luminous flux.Type: GrantFiled: August 10, 2012Date of Patent: September 9, 2014Assignee: Mitsubishi Chemical CorporationInventors: Hiroaki Sakuta, Kazuhiko Kagawa, Yoshihito Satou, Shin Hiraoka
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Patent number: 8710741Abstract: An illuminating device comprises one or more luminescent devices (1). The luminescent device comprises a semiconductor light emitting element (10) emitting a excitation light having an peak within a wavelength range from 350 nm to 430 nm, and a luminescent part (20) comprising a sealing member (22) and a phosphor (21) absorbing the light from the semiconductor light emitting element (10) and emitting a light with different emission spectrum. For the luminescent device (1), an excitation light contribution degree ?E, an index quantitatively representing what extent of a visible component of the excitation light is involved in color mixing of a combined light of the luminescent device (1), is 0.005 or less, and a mean color rendering index Ra is 70 or more.Type: GrantFiled: July 5, 2012Date of Patent: April 29, 2014Assignee: Mitsubishi Chemical CorporationInventors: Akeo Kasakura, Kazuhiko Kagawa, Naoto Kijima
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Publication number: 20140042896Abstract: A white light-emitting semiconductor device having improved reproducibility of bright red. The device outputs light having a blue component, a green component, and a red component. Each of the light components (blue, green, and red) is based on a light-emitting semiconductor element and/or a phosphor that absorbs light emitted by a light-emitting semiconductor element and emits light through wavelength conversion. The outputted light has a spectrum which has a maximum wavelength in the range of 615-645 nm, and the intensity at a wavelength of 580 nm of the outputted light, which has been normalized with respect to luminous flux, is 80-100% of the intensity at a wavelength of 580 nm of standard light for color rendering evaluation, which has been normalized with respect to luminous flux.Type: ApplicationFiled: September 30, 2013Publication date: February 13, 2014Applicant: Mitsubishi Chemical CorporationInventors: Hiroaki SAKUTA, Kazuhiko Kagawa, Yoshihito Satou, Hiroaki Okagawa, Shin Hiraoka
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Patent number: 8581488Abstract: A white light-emitting semiconductor device having improved reproducibility of bright red. The device outputs light having a blue component, a green component, and a red component. Each of the light components (blue, green, and red) consists of a light-emitting semiconductor element and/or a phosphor that absorbs light emitted by a light-emitting semiconductor element and emits light through wavelength conversion. The outputted light has a spectrum which has a maximum wavelength in the range of 615-645 nm, and the intensity at a wavelength of 580 nm of the outputted light, which has been normalized with respect to luminous flux, is 80-100% of the intensity at a wavelength of 580 nm of standard light for color rendering evaluation, which has been normalized with respect to luminous flux.Type: GrantFiled: November 9, 2011Date of Patent: November 12, 2013Assignee: Mitsubishi Chemical CorporationInventors: Hiroaki Sakuta, Kazuhiko Kagawa, Yoshihito Satou, Hiroaki Okagawa, Shin Hiraoka
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Publication number: 20120319565Abstract: The invention aims at providing controllable parameters that are correlated with special color rendering index R9, and at providing a white light-emitting semiconductor device having a high R9 value obtained through optimization of such parameters. The white light-emitting semiconductor device is provided with a phosphor as a light-emitting material and with a light-emitting semiconductor element as an excitation source of the phosphor. The phosphor includes at least a green phosphor and a wide-band red phosphor. In the white light-emitting semiconductor device, an intensity at wavelength 640 nm of an emission spectrum which has been normalized with respect to luminous flux is 100-110% of the intensity at wavelength 640 nm of a spectrum of standard light for color rendering evaluation which has been normalized with respect to luminous flux.Type: ApplicationFiled: August 10, 2012Publication date: December 20, 2012Applicant: Mitsubishi Chemical CorporationInventors: Hiroaki SAKUTA, Kazuhiko Kagawa, Yoshihito Satou, Shin Hiraoka
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Publication number: 20120286646Abstract: The present invention provides a blue (blue-green) phosphor that has sufficient emission intensity in the wavelength region around 490 nm and that has high emission luminance at a temperature region reached during LED operation. The present invention also provides a white light-emitting device that uses a high-luminance green phosphor having an emission peak wavelength of 535 nm or greater and that has improved bright blue reproducibility. A phosphor having a chemical composition of general formula [1] has sufficient emission intensity in a wavelength region around 490 nm, and a white light-emitting device that uses such a phosphor has improved bright blue reproducibility. (Sr, Ca)aBabEux(PO4)cXd??[1] (In general formula [1], X is Cl; c, d and x are numbers satisfying 2.7?c?3.3, 0.9?d?1.1 and 0.3?x?1.2; and a and b satisfy the conditions a+b=5?x and 0.12?b/(a+b)?0.4.Type: ApplicationFiled: April 26, 2012Publication date: November 15, 2012Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Hiroaki SAKUTA, Kazuhiko Kagawa, Yoshihito Sato, Takatoshi Seto, Naoto Kijima
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Publication number: 20120275135Abstract: An illuminating device comprises one or more luminescent devices (1). The luminescent device comprises a semiconductor light emitting element (10) emitting a excitation light having an peak within a wavelength range from 350 nm to 430 nm, and a luminescent part (20) comprising a sealing member (22) and a phosphor (21) absorbing the light from the semiconductor light emitting element (10) and emitting a light with different emission spectrum. For the luminescent device (1), an excitation light contribution degree ?E, an index quantitatively representing what extent of a visible component of the excitation light is involved in color mixing of a combined light of the luminescent device (1), is 0.005 or less, and a mean color rendering index Ra is 70 or more.Type: ApplicationFiled: July 5, 2012Publication date: November 1, 2012Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Akeo KASAKURA, Kazuhiko Kagawa, Naoto Kijima
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Publication number: 20120267999Abstract: The present invention provides a blue (blue-green) phosphor that has sufficient emission intensity in the wavelength region around 490 nm and that has high emission luminance at a temperature region reached during LED operation. The present invention also provides a white light-emitting device that uses a high-luminance green phosphor having an emission peak wavelength of 535 nm or greater and that has improved bright blue reproducibility. A phosphor having a chemical composition of general formula [1] has sufficient emission intensity in a wavelength region around 490 nm, and a white light-emitting device that uses such a phosphor has improved bright blue reproducibility. (Sr,Ca)aBabEux(PO4)cXd??[1] (In general formula [1], X is Cl; c, d and x are numbers satisfying 2.7?c?3.3, 0.9?d?1.1 and 0.3?x?1.2; and a and b satisfy the conditions a+b=5?x and 0.12?b/(a+b)?0.4.).Type: ApplicationFiled: March 2, 2012Publication date: October 25, 2012Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Hiroaki Sakuta, Kazuhiko Kagawa, Yoshihito Sato, Takatoshi Seto, Naoto Kijima
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Patent number: 8258699Abstract: An illuminating device comprises one or more luminescent devices (1). The luminescent device comprises a semiconductor light emitting element (10) emitting a excitation light having an peak within a wavelength range from 350 nm to 430 nm, and a luminescent part (20) comprising a sealing member (22) and a phosphor (21) absorbing the light from the semiconductor light emitting element (10) and emitting a light with different emission spectrum. For the luminescent device (1), an excitation light contribution degree ?E, an index quantitatively representing what extent of a visible component of the excitation light is involved in color mixing of a combined light of the luminescent device (1), is 0.005 or less, and a mean color rendering index Ra is 70 or more.Type: GrantFiled: March 1, 2011Date of Patent: September 4, 2012Assignee: Mitsubishi Chemical CorporationInventors: Akeo Kasakura, Kazuhiko Kagawa, Naoto Kijima
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Publication number: 20120212123Abstract: The present invention provides a blue (blue-green) phosphor that has sufficient emission intensity in the wavelength region around 490 nm and that has high emission luminance at a temperature region reached during LED operation. The present invention also provides a white light-emitting device that uses a high-luminance green phosphor having an emission peak wavelength of 535 nm or greater and that has improved bright blue reproducibility. A phosphor having a chemical composition of general formula [1] has sufficient emission intensity in a wavelength region around 490 nm, and a white light-emitting device that uses such a phosphor has improved bright blue reproducibility. (Sr,Ca)aBabEux(PO4)cXd??[1] (In general formula [1], X is Cl; c, d and x are numbers satisfying 2.7?c?3.3, 0.9?d?1.1 and 0.3?x?1.2; and a and b satisfy the conditions a+b=5?x and 0.05?b/(a+b)?0.6.Type: ApplicationFiled: February 29, 2012Publication date: August 23, 2012Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Hiroaki SAKUTA, Kazuhiko Kagawa, Yoshihito Sato, Takatoshi Seto, Naoto Kijima
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Publication number: 20120112626Abstract: A white light-emitting semiconductor device having improved reproducibility of bright red. The device outputs light having a blue component, a green component, and a red component. Each of the light components (blue, green, and red) consists of a light-emitting semiconductor element and/or a phosphor that absorbs light emitted by a light-emitting semiconductor element and emits light through wavelength conversion. The outputted light has a spectrum which has a maximum wavelength in the range of 615-645 nm, and the intensity at a wavelength of 580 nm of the outputted light, which has been normalized with respect to luminous flux, is 80-100% of the intensity at a wavelength of 580 nm of standard light for color rendering evaluation, which has been normalized with respect to luminous flux.Type: ApplicationFiled: November 9, 2011Publication date: May 10, 2012Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Hiroaki SAKUTA, Kazuhiko KAGAWA, Yoshihito Satou, Hiroaki Okagawa, Shin Hiraoka
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Patent number: 8115124Abstract: A flexible conductor which connects the movable rod side of a circuit breaker and a movable side connection conductor is devised to miniaturize the circuit breaker.Type: GrantFiled: October 29, 2009Date of Patent: February 14, 2012Assignee: Mitsubishi Electric CorporationInventors: Takanao Maruyama, Kazuhiko Kagawa
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Patent number: 8089021Abstract: An object is to provide a vacuum circuit breaker that has a lower electrical and thermal resistance at contacting portions between a movable electrode-rod and a movable-electrode-side connection-terminal so that a continuous current-carrying capacity is made larger without reinforcement and/or enhancement of an operating mechanism. The vacuum circuit breaker herein provided includes a vacuum interrupter held inside an insulation frame; a fixed electrode-rod mounted on one side of the vacuum interrupter; a movable electrode-rod mounted on the other side of the vacuum interrupter; a flexible conductor for electrically connecting the movable electrode-rod with a main-circuit conductor; and a movable-electrode-side connection-terminal fastened on the outer circumference of said movable electrode-rod; wherein the flexible conductor is gripped by a first face and a second face of the movable-electrode-side connection-terminal.Type: GrantFiled: February 27, 2009Date of Patent: January 3, 2012Assignee: Mitsubishi Electric CorporationInventor: Kazuhiko Kagawa
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Publication number: 20110204389Abstract: An illuminating device comprises one or more luminescent devices (1). The luminescent device comprises a semiconductor light emitting element (10) emitting a excitation light having an peak within a wavelength range from 350 nm to 430 nm, and a luminescent part (20) comprising a sealing member (22) and a phosphor (21) absorbing the light from the semiconductor light emitting element (10) and emitting a light with different emission spectrum. For the luminescent device (1), an excitation light contribution degree ?E, an index quantitatively representing what extent of a visible component of the excitation light is involved in color mixing of a combined light of the luminescent device (1), is 0.005 or less, and a mean color rendering index Ra is 70 or more.Type: ApplicationFiled: March 1, 2011Publication date: August 25, 2011Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Akeo KASAKURA, Kazuhiko Kagawa, Naoto Kijima
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Patent number: 7923928Abstract: An illuminating device comprises one or more luminescent devices (1). The luminescent device comprises a semiconductor light emitting element (10) emitting a excitation light having an peak within a wavelength range from 350 nm to 430 nm, and a luminescent part (20) comprising a sealing member (22) and a phosphor (21) absorbing the light from the semiconductor light emitting element (10) and emitting a light with different emission spectrum. For the luminescent device (1), an excitation light contribution degree ?E, an index quantitatively representing what extent of a visible component of the excitation light is involved in color mixing of a combined light of the luminescent device (1), is 0.005 or less, and a mean color rendering index Ra is 70 or more.Type: GrantFiled: June 27, 2007Date of Patent: April 12, 2011Assignee: Mitsubishi Chemical CorporationInventors: Akeo Kasakura, Kazuhiko Kagawa, Naoto Kijima
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Publication number: 20100307901Abstract: A flexible conductor which connects the movable rod side of a circuit breaker and a movable side connection conductor is devised to miniaturize the circuit breaker.Type: ApplicationFiled: October 29, 2009Publication date: December 9, 2010Applicant: Mitsubishi Electric CorporationInventors: Takanao Maruyama, Kazuhiko Kagawa
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Publication number: 20090296304Abstract: A switch is obtained in which whether the counting of the number of operations is performed in accordance with an on-operation counting method or an off-operation counting method can readily be selected and changed, and an operation check can readily be performed.Type: ApplicationFiled: August 29, 2008Publication date: December 3, 2009Applicant: MITSUBISHI ELECTRIC CORPORATIONInventor: Kazuhiko Kagawa
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Publication number: 20090267484Abstract: An illuminating device comprises one or more luminescent devices (1). The luminescent device comprises a semiconductor light emitting element (10) emitting a excitation light having an peak within a wavelength range from 350 nm to 430 nm, and a luminescent part (20) comprising a sealing member (22) and a phosphor (21) absorbing the light from the semiconductor light emitting element (10) and emitting a light with different emission spectrum. For the luminescent device (1), an excitation light contribution degree ?E, an index quantitatively representing what extent of a visible component of the excitation light is involved in color mixing of a combined light of the luminescent device (1), is 0.005 or less, and a mean color rendering index Ra is 70 or more.Type: ApplicationFiled: June 27, 2007Publication date: October 29, 2009Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Akeo Kasakura, Kazuhiko Kagawa, Naoto Kijima
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Publication number: 20090218319Abstract: An object is to provide a vacuum circuit breaker that has a lower electrical and thermal resistance at contacting portions between a movable electrode-rod and a movable-electrode-side connection-terminal so that a continuous current-carrying capacity is made larger without reinforcement and/or enhancement of an operating mechanism. The vacuum circuit breaker herein provided includes a vacuum interrupter held inside an insulation frame; a fixed electrode-rod mounted on one side of the vacuum interrupter; a movable electrode-rod mounted on the other side of the vacuum interrupter; a flexible conductor for electrically connecting the movable electrode-rod with a main-circuit conductor; and a movable-electrode-side connection-terminal fastened on the outer circumference of said movable electrode-rod; wherein the flexible conductor is gripped by a first face and a second face of the movable-electrode-side connection-terminal.Type: ApplicationFiled: February 27, 2009Publication date: September 3, 2009Applicant: MITSUBISHI ELECTRIC CORPORATIONInventor: Kazuhiko Kagawa