Patents Assigned to Citizen Electronics Co., Ltd.
  • Publication number: 20200396815
    Abstract: The present invention addresses an illumination system and an illumination method which make a space including a display item illuminated with VIVID lighting where Duv is greatly deviated negatively from zero not perceived as pale pinkish, and the issue is solved by an illumination system for illuminating a space where a display item is displayed, wherein the illumination system comprises a first light-emitting device mainly illuminating the display item and satisfying the predetermined conditions, and a second light-emitting device mainly illuminating a space other than the display item and satisfying the predetermined conditions.
    Type: Application
    Filed: April 20, 2017
    Publication date: December 17, 2020
    Applicant: Citizen Electronics Co., Ltd.
    Inventors: Koichi Fukasawa, Makoto Arai
  • Patent number: 10858582
    Abstract: 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 1000 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: Grant
    Filed: May 3, 2018
    Date of Patent: December 8, 2020
    Assignee: CITIZEN ELECTRONICS CO., LTD.
    Inventors: Byungchul Hong, Naoki Sako, Naoto Kijima, Masahiko Yoshino, Takashi Hase, Fumiko Yoyasu, Kentarou Horibe
  • Patent number: 10825963
    Abstract: Provided is a light-emitting device and a method for manufacturing the same which avoid a distinct color unevenness during the light emission even if variations are present among the light-emitting elements in the concentration of the phosphor that precipitates in the resin for sealing the light-emitting elements. The light-emitting device includes a substrate, a plurality of light-emitting elements that are mounted on the substrate, a first resin layer that integrally seals the light-emitting elements and includes a first phosphor that is excited by light from the light-emitting elements at a concentration that is high as it goes to a lower end near the substrate from an upper end distant from the substrate, and a second resin layer that is provided at an upper side of the first resin layer and includes a second phosphor that is excited by light from the light-emitting elements at a uniform concentration.
    Type: Grant
    Filed: August 19, 2019
    Date of Patent: November 3, 2020
    Assignees: CITIZEN ELECTRONICS CO., LTD., CITIZEN WATCH CO., LTD.
    Inventors: Sadato Imai, Tatsuya Katoh, Masahiro Watanabe, Kazuki Matsumura
  • Patent number: 10801710
    Abstract: An LED lighting device capable of discharging heat generated from a light emitting element to the outside the LED lighting device. An LED lighting device includes: a plurality of light emitting elements; a mounted substrate on which the light emitting elements are mounted; and an electrode portion configured to supply a current to the light emitting elements from outside the LED lighting device. On the mounted substrate, a wiring substrate is located. On the upper surface of the mounted substrate, the mounted substrate includes: a light emitting region in which the plurality of light emitting elements are mounted; an exposed region which is located on the outer side of the light emitting region and through which the upper surface of the mounted substrate is exposed; and a wiring region which is located on the outer side of the light emitting region and in which the wiring substrate is located.
    Type: Grant
    Filed: May 22, 2017
    Date of Patent: October 13, 2020
    Assignees: CITIZEN ELECTRONICS CO., LTD., CITIZEN WATCH CO., LTD.
    Inventors: Takashi Iino, Sadato Imai
  • Patent number: 10793771
    Abstract: A phosphor film includes phosphor particles, a thermally-conductive filler, and a hinder bonding the phosphor particles and the thermally-conductive filler together. The thermally-conductive filler includes glass particles and/or alumina particles. A weight ratio of a weight of the binder to a total weight of the phosphor particles and the thermally-conductive filler is in a range of 0.1 wt % to 5.0 wt %.
    Type: Grant
    Filed: February 28, 2018
    Date of Patent: October 6, 2020
    Assignees: CITIZEN ELECTRONICS CO., LTD., CITIZEN WATCH CO., LTD.
    Inventors: Norihiko Kobayashi, Hiroaki Hara, Hiroo Kajiwara
  • Publication number: 20200243733
    Abstract: It is made possible to use a lens array including common lenses as a lens array that collects beams of light from light-emitting units, regardless of the number of light-emitting elements included in each light-emitting unit, thereby reducing the manufacturing cost of a light-emitting device. The light-emitting device includes a substrate, light-emitting units arranged on the substrate, and a lens array including lenses provided corresponding to the light-emitting units, respectively, to collect beams of emission light from the respective light-emitting units, the lens array being arranged on the light-emitting units. Each of the light-emitting units has light-emitting elements that are mounted on the substrate in a lattice pattern and are series-parallel connected to one another in a mount region whose shape is common in the light-emitting units so as to include a predetermined number of series connections and a predetermined number of parallel connections which are set for the light-emitting unit.
    Type: Application
    Filed: June 17, 2016
    Publication date: July 30, 2020
    Applicants: CITIZEN ELECTRONICS CO., LTD., CITIZEN WATCH CO., LTD.
    Inventors: Sadato Imai, Kohsuke Kashitani, Teruhiko Hodohara
  • Patent number: 10714460
    Abstract: A light-emitting device and a manufacturing method thereof are provided, which device yields light exhibiting an actual hue with a deviation reduced as much as possible from a designed hue value, the light being a mixture of light emitted from a plurality of light-emitting elements mounted densely and excited light from a phosphor contained in a resin sealing the light-emitting elements. The light-emitting device includes a board, a plurality of light-emitting elements mounted densely on the board, a first resin free from any phosphor, placed among the plurality of light-emitting elements, and a second resin containing a phosphor and covering an exposed part of the plurality of light-emitting elements.
    Type: Grant
    Filed: February 9, 2016
    Date of Patent: July 14, 2020
    Assignees: Citizen Electronics Co., Ltd., Citizen Watch Co., Ltd.
    Inventors: Sadato Imai, Masahide Watanabe, Hirohiko Ishii, Koki Hirasawa
  • Patent number: 10707189
    Abstract: A light-emitting device is provided whose color mixing property and light emission efficiency are improved, while white light with high color rendering performance is ensured by means of four kinds of LED elements emitting red, green, blue, and white light respectively.
    Type: Grant
    Filed: September 20, 2016
    Date of Patent: July 7, 2020
    Assignees: Citizen Electronics Co., Ltd., Citizen Watch Co., Ltd.
    Inventors: Masahiko Hamada, Hirohiko Ishii
  • Patent number: 10699855
    Abstract: An electronic switch includes a rubber sheet that includes a first surface, a second surface opposite to the first surface, and a convex portion on the first surface. The convex portion of the rubber sheet includes a semispherical shape.
    Type: Grant
    Filed: January 31, 2018
    Date of Patent: June 30, 2020
    Assignees: CITIZEN ELECTRONICS CO., LTD., CITIZEN WATCH CO., LTD.
    Inventor: Takahiro Arai
  • Patent number: 10629786
    Abstract: A light-emitting device and a manufacturing method thereof are provided, which device yields light exhibiting an actual hue with a deviation reduced as much as possible from a designed hue value, wherein the light is a mixture of light emitted from densely-mounted light-emitting elements and excited light from a phosphor contained in a resin sealing the light-emitting elements. The light-emitting device includes a board, light-emitting elements mounted densely on the board so that light-emitting surfaces thereof face opposite to the board, and a seal resin containing a plurality of different phosphors and covering all of the light-emitting elements, wherein the phosphors are excited by light from the light-emitting elements and deposited on upper surfaces of the light-emitting elements. A space between adjacent light-emitting elements has a length of 5 ?m or more and 120% or less of a median diameter D50 of a phosphor which has the largest average particle size of the phosphors.
    Type: Grant
    Filed: May 30, 2016
    Date of Patent: April 21, 2020
    Assignees: CITIZEN ELECTRONICS CO., LTD., CITIZEN WATCH CO., LTD.
    Inventors: Sadato Imai, Masahide Watanabe, Hirohiko Ishii, Koki Hirasawa
  • Patent number: 10629785
    Abstract: Provided is a light-emitting device including a mount board, an LED element mounted on the mount board, and a translucent or transparent sealing resin being filled onto the mount board to seal the LED element. The sealing resin contains first and second particulate phosphors excited by emitted light from the LED element, and a nanoscale filler having an average particle size in the range of 1 nm to 100 nm. The specific gravity of the first particulate phosphor is smaller than that of the second particulate phosphor. The sealing resin includes a dispersion layer of the first particulate phosphor covering areas obliquely above and beside the LED element, and a deposition layer of the second particulate phosphor on upper surfaces of the mount board and the LED element. The first particulate phosphor is dispersed in the dispersion layer among aggregates formed by particles of the nanoscale filler.
    Type: Grant
    Filed: August 21, 2018
    Date of Patent: April 21, 2020
    Assignees: CITIZEN ELECTRONICS CO., LTD., CITIZEN WATCH CO., LTD
    Inventor: Nodoka Oyamada
  • Patent number: 10591662
    Abstract: To provide a planar light unit that optically and mechanically connects a light-emitting device and a light guide plate to each other in a stable manner so as to improve luminous efficiency and brightness uniformity on a light exit surface. A planar light unit 40 includes: a light guide plate 2, which includes a light incident portion 2f on a side edge of the light guide plate 2; a light-emitting device 3, which is configured to emit light into an inside of the light guide plate 2 through the light incident portion 2f; and a light source board 4, on which the light-emitting device 3 is mounted. The light incident portion 2f includes a recess 2a and a reflecting-shaped portion 2b. A flexible resin 6, which has a light-transmitting property and a flexibility, is disposed between a light incident surface 2c, which is formed on the recess 2a, and the light-emitting device 3.
    Type: Grant
    Filed: January 13, 2017
    Date of Patent: March 17, 2020
    Assignees: CITIZEN ELECTRONICS CO., LTD., CITIZEN WATCH CO., LTD.
    Inventors: Junji Miyashita, Tomoo Udagawa
  • Patent number: 10591141
    Abstract: Provided is a light-emitting apparatus including a substrate, a plurality of light-emitting units each having a plurality of LED elements mounted on the substrate in a rectangular lattice pattern, wherein each of the light-emitting units has a rectangular light-emitting region, and a lens array including a plurality of lenses provided corresponding to the light-emitting units, respectively, the lens array being arranged on the plurality of light-emitting units, wherein the plurality of lenses is designed such that beams of emission light from the plurality of light-emitting units are collected and radiated so as to overlap with one another at a position distant from the substrate, and a part of the plurality of light-emitting units is arranged to be inclined with respect to a reference direction in a plane of the substrate by an angle different from that of other light-emitting units.
    Type: Grant
    Filed: July 20, 2017
    Date of Patent: March 17, 2020
    Assignees: Citizen Electronics Co., Ltd., Citizen Watch Co., Ltd.
    Inventor: Koichi Fukasawa
  • Patent number: 10585308
    Abstract: A light-emitting device comprises a first optical element covering an LED and covered by a second optical element. The first optical element has: a first incident surface on which light emitted from the LED is incident; a recessed first reflecting surface, above the first incident surface, and reflecting to the side the light is incident via the first incident surface from the LED; and a first emitting surface across the periphery of the first reflecting surface, which emits the light from the first reflecting surface. The second optical element has: an incident-reflecting surface formed by, concentric second incident surfaces on which light emitted from the first emitting surface is incident, and second reflecting surfaces alternately with the second incident surfaces, that reflect upward the light incident on the second incident surfaces; and a second emitting surface above the incident-reflecting surface, that emit light reflected by the second light reflecting surfaces.
    Type: Grant
    Filed: September 12, 2017
    Date of Patent: March 10, 2020
    Assignees: CITIZEN WATCH CO., LTD., CITIZEN ELECTRONICS CO., LTD.
    Inventors: Toshinobu Katsumata, Takuma Horiuchi
  • Patent number: 10559722
    Abstract: Provided is a light-emitting device of which a resin frame serving as a dam of a sealing resin is not readily deformed. The light-emitting device includes: a planar lead frame configured from first and second metal portions which are spaced apart from each other with an insulating resin interposed therebetween; light-emitting elements mounted on the first metal portion and electrically connected by wires to the first and second metal portions; a first resin frame disposed on the lead frame so as to enclose the light-emitting elements; a sealing resin containing a phosphor for converting the wavelength of light emitted from the light-emitting elements, the sealing resin being filled into a region on the lead frame enclosed by the first resin frame to seal the light-emitting elements; and a second resin frame being harder than the first resin frame and covering an outer surface of the first resin frame at an outer edge of the lead frame.
    Type: Grant
    Filed: April 25, 2017
    Date of Patent: February 11, 2020
    Assignees: CITIZEN ELECTRONICS CO., LTD., CITIZEN WATCH CO., LTD.
    Inventors: Yuji Omori, Sadato Imai, Koki Hirasawa
  • Patent number: D885354
    Type: Grant
    Filed: October 7, 2019
    Date of Patent: May 26, 2020
    Assignees: CITIZEN ELECTRONICS CO., LTD., CITIZEN WATCH CO., LTD.
    Inventor: Shinsuke Watanabe
  • Patent number: D878311
    Type: Grant
    Filed: May 5, 2017
    Date of Patent: March 17, 2020
    Assignees: CITIZEN ELECTRONICS CO., LTD., CITIZEN WATCH CO., LTD.
    Inventor: Shinsuke Watanabe
  • Patent number: D895559
    Type: Grant
    Filed: March 27, 2019
    Date of Patent: September 8, 2020
    Assignees: CITIZEN ELECTRONICS CO., LTD., CITIZEN WATCH CO., LTD
    Inventors: Shingo Kuriki, Masahiro Watanabe, Kazuki Matsumura, Yuji Omori
  • Patent number: D902875
    Type: Grant
    Filed: September 14, 2018
    Date of Patent: November 24, 2020
    Assignees: CITIZEN ELECTRONICS CO., LTD., CITIZEN WATCH CO., LTD.
    Inventors: Takuya Funakubo, Takeru Ohmori
  • Patent number: D904989
    Type: Grant
    Filed: March 27, 2019
    Date of Patent: December 15, 2020
    Assignees: CITIZEN ELECTRONICS CO., LTD., CITIZEN WATCH CO., LTD.
    Inventors: Masahiro Watanabe, Shingo Kuriki, Kazuki Matsumura