Patents Assigned to Citizens Electronics Co., Ltd.
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Publication number: 20240101899Abstract: To provide a semiconductor light emitting device which is capable of accomplishing a broad color reproducibility for an entire image without losing brightness of the entire image. A light source provided on a backlight for a color image display device has a semiconductor light emitting device comprising a solid light emitting device to emit light in a blue or deep blue region or in an ultraviolet region and phosphors, in combination. The phosphors comprise a green emitting phosphor and a red emitting phosphor. The green emitting phosphor and the red emitting phosphor are ones, of which the rate of change of the emission peak intensity at 100° C. to the emission intensity at 25° C., when the wavelength of the excitation light is 400 nm or 455 nm, is at most 40%.Type: ApplicationFiled: November 30, 2023Publication date: March 28, 2024Applicants: CITIZEN ELECTRONICS CO., LTD., NICHIA CORPORATIONInventors: Byungchul HONG, Naoki SAKO, Naoto KIJIMA, Masahiko YOSHINO, Takashi HASE, Fumiko YOYASU, Kentarou HORIBE
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Patent number: 11873435Abstract: To provide a semiconductor light emitting device which is capable of accomplishing a broad color reproducibility for an entire image without losing brightness of the entire image. A light source provided on a backlight for a color image display device has a semiconductor light emitting device comprising a solid light emitting device to emit light in a blue or deep blue region or in an ultraviolet region and phosphors, in combination. The phosphors comprise a green emitting phosphor and a red emitting phosphor. The green emitting phosphor and the red emitting phosphor are ones, of which the rate of change of the emission peak intensity at 100° C. to the emission intensity at 25° C., when the wavelength of the excitation light is 400 nm or 455 nm, is at most 40%.Type: GrantFiled: February 22, 2023Date of Patent: January 16, 2024Assignees: CITIZEN ELECTRONICS CO., LTD., NICHIA CORPORATIONInventors: Byungchul Hong, Naoki Sako, Naoto Kijima, Masahiko Yoshino, Takashi Hase, Fumiko Yoyasu, Kentarou Horibe
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Patent number: 11855244Abstract: A light emitting device has a substrate having a rectangular planar shape, one or a plurality of light emitting elements mounted on the substrate, a dam resin having a frame-like planar shape, arranged so as to surround the light emitting element, and having an inclined surface whose height increases as its distance from the light emitting element increases, and a seal resin arranged in an area surrounded by the dam resin and which seals the light emitting element, and the dam resin has a protruding portion extending and protruding from at least one side toward the opposite side.Type: GrantFiled: November 24, 2021Date of Patent: December 26, 2023Assignees: Citizen Electronics Co., Ltd., Citizen Watch Co., Ltd.Inventors: Jo Kinoshita, Shiori Koike
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Patent number: 11841528Abstract: A linear light-emitting device including a substrate extending while being curved in a predetermined direction, a plurality of light-emitting elements arranged on the substrate in a predetermined direction, and a seal for sealing the plurality of light-emitting elements, wherein a luminance of a specific part of the substrate is higher than that of the other parts of the substrate.Type: GrantFiled: June 25, 2020Date of Patent: December 12, 2023Assignees: Citizen Electronics Co., Ltd., Citizen Watch Co., Ltd.Inventors: Takumi Miyashita, Ryo Tamura, Takahiro Shimizu, Takuma Horiuchi, Ryo Matsuura
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Patent number: 11817530Abstract: A light emitting device includes a substrate, a plurality of first light emitting elements mounted on the substrate, including first LED dies, and emitting light having a first wavelength, and a light guide layer arranged so as to cover the plurality of first light emitting elements, and guiding the light from the plurality of first light emitting elements, wherein when LG1 is a distance between the first LED dies, and ?c is a critical angle of the light emitted from the light guide layer to the air, and a thickness T between the upper surfaces of the first light emitting elements and the upper surface of the light guide layer is equal to or longer than T1 indicated by T1=LG1/(2tan ?c).Type: GrantFiled: June 28, 2021Date of Patent: November 14, 2023Assignees: Citizen Electronics Co., Ltd., Citizen Watch Co., Ltd.Inventor: Keisuke Sakai
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Patent number: 11756939Abstract: A light emitting device includes a first light emitting element, a second light emitting element, a first phosphor sheet containing a first phosphor and a third phosphor, and covering a top face of the first light emitting element, and a second phosphor sheet containing a second phosphor and a fourth phosphor, and covering a top face of the second light emitting element, wherein a peak wavelength of light which is wavelength-converted by the first phosphor or the third phosphor is equal to or less than a peak wavelength of light which is wavelength-converted by the second phosphor or the fourth phosphor.Type: GrantFiled: April 25, 2022Date of Patent: September 12, 2023Assignees: Citizen Electronics Co., Ltd., Citizen Watch Co., Ltd.Inventors: Yuki Suto, Jo Kinosita
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Patent number: 11697765Abstract: Phosphors include a CaAlSiN3 family crystal phase, wherein the CaAlSiN3 family crystal phase comprises at least one element selected from the group consisting of Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, and Yb.Type: GrantFiled: June 29, 2021Date of Patent: July 11, 2023Assignees: MITSUBISHI CHEMICAL CORPORATION, NATIONAL INSTITUTE FOR MATERIALS SCIENCE, NICHIA CORPORATION, CITIZEN ELECTRONICS CO., LTD.Inventors: Naoto Hirosaki, Kyota Ueda, Hajime Yamamoto
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Publication number: 20230193126Abstract: To provide a semiconductor light emitting device which is capable of accomplishing a broad color reproducibility for an entire image without losing brightness of the entire image. A light source provided on a backlight for a color image display device has a semiconductor light emitting device comprising a solid light emitting device to emit light in a blue or deep blue region or in an ultraviolet region and phosphors, in combination. The phosphors comprise a green emitting phosphor and a red emitting phosphor. The green emitting phosphor and the red emitting phosphor are ones, of which the rate of change of the emission peak intensity at 100° C. to the emission intensity at 25° C., when the wavelength of the excitation light is 400 nm or 455 nm, is at most 40%.Type: ApplicationFiled: February 22, 2023Publication date: June 22, 2023Applicants: CITIZEN ELECTRONICS CO., LTD., NICHIA CORPORATIONInventors: Byungchul HONG, Naoki SAKO, Naoto KIJIMA, Masahiko YOSHINO, Takashi HASE, Fumiko YOYASU, Kentarou HORIBE
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Patent number: 11626546Abstract: Provided is an LED package and a method for manufacturing the same wherein, if its sealing resin containing phosphor particles each having a coating layer is cut or ground, age deterioration of the phosphor particles in the cut or ground surface is prevented. The method includes: mounting LED elements on a substrate; filling a first resin on the substrate to seal the LED elements, the first resin being transparent or translucent and containing wavelength conversion particles configured by forming a coating layer on at least part of the surface of each phosphor particle which converts the wavelength of light emitted from the LED elements; cutting or grinding the first resin; and forming a protective layer with a second resin on a cut surface of the first resin exposed as a result of the cutting or on a ground surface of the first resin, the second resin not containing the wavelength conversion particles.Type: GrantFiled: January 11, 2022Date of Patent: April 11, 2023Assignees: CITIZEN ELECTRONICS CO., LTD., CITIZEN WATCH CO., LTD.Inventors: Toshiyuki Mizuno, Yoshihito Kitta
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Patent number: 11613698Abstract: To provide a semiconductor light emitting device which is capable of accomplishing a broad color reproducibility for an entire image without losing brightness of the entire image. A light source provided on a backlight for a color image display device has a semiconductor light emitting device comprising a solid light emitting device to emit light in a blue or deep blue region or in an ultraviolet region and phosphors, in combination. The phosphors comprise a green emitting phosphor and a red emitting phosphor. The green emitting phosphor and the red emitting phosphor are ones, of which the rate of change of the emission peak intensity at 100° C. to the emission intensity at 25° C., when the wavelength of the excitation light is 400 nm or 455 nm, is at most 40%.Type: GrantFiled: November 13, 2020Date of Patent: March 28, 2023Assignees: CITIZEN ELECTRONICS CO., LTD., NICHIA CORPORATIONInventors: Byungchul Hong, Naoki Sako, Naoto Kijima, Masahiko Yoshino, Takashi Hase, Fumiko Yoyasu, Kentarou Horibe
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Publication number: 20220393081Abstract: It is an object of the present invention to improve light source efficiency of “a light-emitting device capable of realizing a natural, vivid, highly visible and comfortable appearance of colors or an appearance of objects” already arrived at by adopting a spectral power distribution having a shape completely different from the shape of conventionally known spectral power distributions while maintaining favorable color appearance characteristics.Type: ApplicationFiled: July 27, 2022Publication date: December 8, 2022Applicant: CITIZEN ELECTRONICS CO., LTD.Inventor: Hideyoshi HORIE
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Patent number: 11450789Abstract: It is an object of the present invention to improve light source efficiency of “a light-emitting device capable of realizing a natural, vivid, highly visible and comfortable appearance of colors or an appearance of objects” already arrived at by adopting a spectral power distribution having a shape completely different from the shape of conventionally known spectral power distributions while maintaining favorable color appearance characteristics.Type: GrantFiled: June 24, 2016Date of Patent: September 20, 2022Assignee: CITIZEN ELECTRONICS CO., LTD.Inventor: Hideyoshi Horie
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Patent number: 11342312Abstract: A light emitting device includes a first light emitting element, a second light emitting element, a first phosphor sheet containing a first phosphor and a third phosphor, and covering a top face of the first light emitting element, and a second phosphor sheet containing a second phosphor and a fourth phosphor, and covering a top face of the second light emitting element, wherein a peak wavelength of light which is wavelength-converted by the first phosphor or the third phosphor is equal to or less than a peak wavelength of light which is wavelength-converted by the second phosphor or the fourth phosphor.Type: GrantFiled: August 20, 2019Date of Patent: May 24, 2022Assignees: Citizen Electronics Co., Ltd., Citizen Watch Co., Ltd.Inventors: Yuki Suto, Jo Kinosita
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Patent number: 11306884Abstract: A planar light-emitting device having a linear light-emitter having a substrate extending in a predetermined direction, a first line and a second line including a plurality of light-emitting elements arranged along the predetermined direction on the substrate, the first line and the second line being arranged side by site along the predetermined direction with an interval, a first frame arranged on the substrate so as to surround the first line, a second frame arranged on the substrate so as to surround the second line, a first seal arranged inside the first frame for sealing the plurality of light-emitting elements, a second seal arranged inside the second frame for sealing the plurality of light-emitting elements, and a plurality of electrodes arranged on the substrate and electrically connected with the plurality of light-emitting elements, and a light guide plate having an incidence surface having a first flat portion facing to the first line, a second flat portion facing to the second line, a projectingType: GrantFiled: December 3, 2019Date of Patent: April 19, 2022Assignees: CITIZEN ELECTRONICS CO., LTD., CITIZEN WATCH CO., LTD.Inventors: Takashi Watanabe, Kazuya Ishihara
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Patent number: 11270855Abstract: The movable contact body for a switch includes at least one movable contact having an upwardly convex leaf-spring shape, a cover member disposed so as to cover an upper surface of the movable contact, and a holding member disposed so as to face a lower surface of the movable contact, the holding member having a contact through-hole through which a top portion of the movable contact can pass.Type: GrantFiled: November 20, 2018Date of Patent: March 8, 2022Assignees: CITIZEN ELECTRONICS CO., LTD., CITIZEN WATCH CO., LTD.Inventors: Hiroto Isoda, Satoshi Okuma, Soichiro Amano, Ken Ito
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Publication number: 20220056339Abstract: Phosphors include a CaAlSiN3 family crystal phase, wherein the CaAlSiN3 family crystal phase comprises at least one element selected from the group consisting of Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, and Yb.Type: ApplicationFiled: June 29, 2021Publication date: February 24, 2022Applicants: MITSUBISHI CHEMICAL CORPORATION, NATIONAL INSTITUTE FOR MATERIALS SCIENCE, NICHIA CORPORATION, CITIZEN ELECTRONICS CO., LTD.Inventors: Naoto HIROSAKI, Kyota UEDA, Hajime YAMAMOTO
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Patent number: D956704Type: GrantFiled: December 4, 2020Date of Patent: July 5, 2022Assignees: Citizen Electronics Co., Ltd., Citizen Watch Co., Ltd.Inventor: Ryo Wakuda
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Patent number: D966208Type: GrantFiled: April 23, 2021Date of Patent: October 11, 2022Assignees: CITIZEN ELECTRONICS CO., LTD., CITIZEN WATCH CO., LTD.Inventor: Yuji Omori
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Patent number: D989011Type: GrantFiled: July 23, 2021Date of Patent: June 13, 2023Assignees: Citizen Electronics Co., Ltd., Citizen Watch Co., Ltd.Inventor: Takashi Iino
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Patent number: D995455Type: GrantFiled: February 26, 2021Date of Patent: August 15, 2023Assignees: Citizen Electronics Co., Ltd., Citizen Watch Co., Ltd.Inventors: Takahiro Hori, Tatsuro Yamada, Kenichi Kikuchi, Yasuaki Kayanuma, Yu Kayanuma