Patents Assigned to Citizen Watch Co., Ltd.
  • 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
  • Publication number: 20200081404
    Abstract: An electronic watch includes a power source, an electrostatic motor including a rotor in which a plurality of electret films are arranged in a rotational direction and a plurality of fixed electrodes arranged in the rotational direction at positions facing the rotor, a hand rotating in conjunction with the rotation of the rotor, and a motor control circuit controlling the electrostatic motor. The motor control circuit selectively executes a hand movement mode for rotating the hand and a stop mode for keeping the hand stationary. In the stop mode, the motor control circuit keeps the rotor stationary through electrostatic forces exerted on the electret films from the fixed electrodes with the polarities of the fixed electrodes maintained.
    Type: Application
    Filed: September 6, 2019
    Publication date: March 12, 2020
    Applicant: CITIZEN WATCH CO., LTD.
    Inventors: Toshinari MAEDA, Shogo KIMURA
  • 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: 10579019
    Abstract: A watch including: a first drive mechanism including a hand having a rotational axis along a first direction, a wheel train, and a drive power source; and a second drive mechanism including a hand having a rotational axis along a second direction different from the first direction, a wheel train, and a drive power source, wherein the first drive mechanism and the second drive mechanism are mounted separately. Each of the first direction and the second direction is defined along a normal direction to dial at a position of a rotational axis of the hand.
    Type: Grant
    Filed: January 28, 2016
    Date of Patent: March 3, 2020
    Assignee: Citizen Watch Co., LTD.
    Inventors: Yasuo Kitajima, Hiroyuki Takahashi, Kyohei Miyajima, Yuichi Naito
  • Publication number: 20200061766
    Abstract: A coolant coupling device (20) includes: a cylinder chamber (25) provided for a support member (2) for a tool rest (4) in a machine tool and supplied with coolant; a piston (P) movably arranged in the cylinder chamber (25); and a coolant supply flow channel (30) provided for the piston (P) for passing coolant therethrough. The piston (P) is driven by the coolant supplied to the cylinder chamber (25) so that an outlet (32) of the coolant supply flow channel (30) is connected to a coolant inlet port (10) of the tool rest (4) to supply the coolant to the tool rest (4). The piston (P) comprises a cylindrical projection (29) protruding toward and into the cylinder chamber (25), and the coolant supply flow channel (30) has an inlet (34) that opens at an outer peripheral surface of the cylindrical projection (29).
    Type: Application
    Filed: November 15, 2017
    Publication date: February 27, 2020
    Applicants: CITIZEN WATCH CO., LTD., CITIZEN MACHINERY CO., LTD.
    Inventor: Kazuyuki IZUMI
  • Patent number: 10566913
    Abstract: Provided is an electric power generating device capable of performing electret power generation by efficiently rotating a rotating electrode group.
    Type: Grant
    Filed: March 19, 2015
    Date of Patent: February 18, 2020
    Assignee: Citizen Watch Co., LTD.
    Inventors: Kensaku Matsumoto, Takashi Ihara, Makoto Watanabe, Akira Izumi
  • 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: 10551669
    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: February 4, 2020
    Assignees: CITIZEN WATCH CO., LTD., CITIZEN ELECTRONICS CO., LTD.
    Inventors: Toshinobu Katsumata, Takuma Horiuchi
  • Patent number: 10545459
    Abstract: Provided is a drive circuit for a two-coil stepper motor, including: a rotor; a stator including first, second, and third stator magnetic-pole portions; a coil A to be magnetically coupled to the first stator magnetic-pole portion and the third stator magnetic-pole portion; a coil B to be magnetically coupled to the second stator magnetic-pole portion and the third stator magnetic-pole portion; a drive pulse generation circuit configured to output a drive pulse; a detection pulse generation circuit configured to output a detection pulse for detecting counter-electromotive currents generated in the coil A and the coil B; and a rotation detection circuit configured to receive a detection signal generated due to the detection pulse as input to determine whether or not the rotor has rotated.
    Type: Grant
    Filed: September 9, 2016
    Date of Patent: January 28, 2020
    Assignee: Citizen Watch Co., LTD.
    Inventors: Yu Takyoh, Toshiaki Fukushima, Toshinari Maeda, Daisuke Iri, Daisuke Matsuoh
  • Patent number: 10534319
    Abstract: An escapement for a timepiece includes an escape wheel that rotates about a shaft center and a pallet that oscillates. The escape wheel includes fifteen teeth. The pallet includes an entry pallet jewel and an exit pallet jewel that switch the rotation and stop of the escape wheel and receive torque from the escape wheel by contacting the teeth. The escape wheel and a balance (an impulse pin) apply and receive torque only via the pallet. The pallet includes a third pallet jewel (a torque applying and receiving member) that receives torque from a convex portion of the escape wheel in addition to the entry pallet jewel and the exit pallet jewel.
    Type: Grant
    Filed: August 2, 2016
    Date of Patent: January 14, 2020
    Assignee: CITIZEN WATCH CO., LTD.
    Inventors: Tadahiro Fukuda, Shinpei Fukaya
  • Patent number: 10508778
    Abstract: Provided is a light-emitting device in which a light-emitting region is increased in size without decreasing the yield. This light-emitting device includes a central light-emitting unit, and a plurality of peripheral light-emitting units arranged to fill a periphery of the central light-emitting unit, wherein each of the central light-emitting unit and the peripheral light-emitting units includes a substrate and light-emitting elements mounted on the substrate, and an area of the light-emitting region of each of the peripheral light-emitting units is equal to or smaller than an area of the light-emitting region of the central light-emitting unit.
    Type: Grant
    Filed: July 15, 2015
    Date of Patent: December 17, 2019
    Assignees: Citizen Electronics Co., Ltd., Citizen Watch Co., Ltd.
    Inventors: Shingo Kuriki, Arata Shimozawa
  • Publication number: 20190378824
    Abstract: 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: Application
    Filed: August 20, 2019
    Publication date: December 12, 2019
    Applicants: Citizen Electronics Co., Ltd., Citizen Watch Co., Ltd.
    Inventors: Yuki Suto, Jo Kinosita
  • Publication number: 20190376175
    Abstract: A hard decorative member of the invention includes a gold alloy layer that is formed as a film by a dry plating method on a base material made of titanium or composed of a base and titanium formed on a surface of the base. The hard decorative member includes an undercoat layer that is formed on the base material and includes titanium carbon nitride, an adhesion layer that is formed on the undercoat layer and includes titanium carbon nitride, gold, copper and palladium, and a gold alloy layer that is formed on the adhesion layer and includes gold, copper and palladium. The gold alloy layer contains 70.3 to 75.2% by weight of gold, 20.7 to 25.6% by weight of copper, and 3.7 to 4.3% by weight of palladium.
    Type: Application
    Filed: June 10, 2019
    Publication date: December 12, 2019
    Applicant: CITIZEN WATCH CO., LTD.
    Inventor: Rikuto YOSHIDA
  • Patent number: 10496044
    Abstract: A satellite radio-controlled watch, including a receiving unit for receiving a satellite radio wave containing time information and position information; a storage unit for storing intersection point information indicating a position of an intersection point between a reference line along a great circle orthogonal to a specific great circle on the earth or a reference line along the specific great circle on the earth or a circle parallel to the great circle and a time zone boundary, and time difference division information on a wedge-shaped or belt-shaped area that is adjacent to the reference line and to which the intersection point belongs, and a time zone determination unit for determining a time zone, based on the position information, the intersection point information, and the time difference division information.
    Type: Grant
    Filed: December 11, 2015
    Date of Patent: December 3, 2019
    Assignee: Citizen Watch Co., LTD.
    Inventors: Masayuki Araki, Kohichi Kazahari, Takashi Ihara
  • Patent number: 10481582
    Abstract: A machine tool includes a machining chamber, an illuminator in the machining chamber, and an NC unit. The NC unit includes a manual execution unit for executing the machining operation via a pulse signal generated in response to operation of a manually operated part, and has a one-block stop mode in which the NC program is executed for one block and then stopped. A notification unit issues a notification of completion of the execution of one block of the NC program while the machining operation is executed manually using the manual execution unit in the one-block stop mode, and the notification unit includes the illuminator. A change in the illumination state of the illuminator enables an operator to observe the interior of the machining chamber continuously while being notified of the completion of the execution of the one block of the NC program.
    Type: Grant
    Filed: August 25, 2017
    Date of Patent: November 19, 2019
    Assignees: Citizen Watch Co., Ltd, Citizen Machinery Co., Ltd.
    Inventor: Noriyuki Asahara
  • Patent number: 10483056
    Abstract: In a first aspect of the present disclosure, a push switch includes a resilient member that is made of metal, and the resilient member including a concave shape and an opening that is positioned at a center of the concave shape and at least two protrusions each protruding outward and downward with an oblique angle around the concave shape.
    Type: Grant
    Filed: July 12, 2017
    Date of Patent: November 19, 2019
    Assignees: CITIZEN ELECTRONICS CO., LTD., CITIZEN WATCH CO., LTD.
    Inventor: Ryo Wakuda
  • Patent number: D866351
    Type: Grant
    Filed: February 28, 2018
    Date of Patent: November 12, 2019
    Assignee: CITIZEN WATCH CO., LTD.
    Inventor: Toshinori Okazaki
  • Patent number: D866352
    Type: Grant
    Filed: August 30, 2017
    Date of Patent: November 12, 2019
    Assignee: CITIZEN WATCH CO., LTD.
    Inventor: Chau Hon Ming
  • Patent number: D867195
    Type: Grant
    Filed: August 30, 2017
    Date of Patent: November 19, 2019
    Assignee: CITIZEN WATCH CO., LTD.
    Inventor: Toshinori Okazaki
  • Patent number: D868299
    Type: Grant
    Filed: February 9, 2018
    Date of Patent: November 26, 2019
    Assignees: CITIZEN ELECTRONICS CO., LTD., CITIZEN WATCH CO., LTD.
    Inventors: Teruhiko Hodohara, Sadato Imai