Patents Assigned to Citizen Watch Co., Ltd.
  • Patent number: 11921464
    Abstract: A timepiece according to an embodiment enables a crown to be rotated even when it is locked, using a structure that does not cause constraints of design. The timepiece includes an outer case having a movement therein, the outer case having a crown hole through a portion thereof, an engagement member connected to the outer case, and a crown. The crown includes a shaft part inserted into the crown hole and connected to the movement, an operation part holding the shaft part movably along an axial direction of the shaft part and enabling the shaft part to rotate in a circumferential direction, and an engagement part disposed between the engagement member and the operation part and restricting movement of the operation part in the axial direction when engaged with the engagement member, the engagement part rotatably holding the operation part whether or not engaged with the engagement member.
    Type: Grant
    Filed: March 30, 2020
    Date of Patent: March 5, 2024
    Assignee: CITIZEN WATCH CO., LTD.
    Inventor: Yuji Yahara
  • Patent number: 11919093
    Abstract: A machine tool includes a plurality of modules, and a control means for controlling operation of the modules, wherein the plurality of modules include a fixed module and two movable modules. The control means includes a restriction means for restricting the movement of the two movable modules for allowing only one of the movable modules to be moved to a facing position facing the fixed module; and a determination means for determining the movable module to be moved to the facing position. The control means is configured to control the operation of the plurality of modules so that, when the operation under cooperation of the fixed module and one of the movable modules has been completed, the restriction means releases the restriction of the movement of the other movable module to the facing position.
    Type: Grant
    Filed: September 24, 2019
    Date of Patent: March 5, 2024
    Assignees: CITIZEN WATCH CO., LTD., CITIZEN MACHINERY CO., LTD.
    Inventor: Shuichi Watabe
  • Patent number: 11892479
    Abstract: A magnetic field sensor element 1 includes a light emitter 10 emitting a first linearly polarized light, a first optical element 20 emitting a first linearly polarized wave and the second linearly polarized wave in response to a first linearly polarized light incident, and emitting a second linearly polarized light in response to a third linearly polarized wave and the a linearly polarized wave incident, at least one pair of magnetic field sensor elements 50 capable of disposing in a predetermined magnetic field across the measured conductor, having a light transmissive, changing the phase of transmitted light in accordance with the magnetic field, and fixing a relative position therebetween, an optical path 30 including a first optical path propagating the first linearly polarized wave and the fourth linearly polarized wave, and a second optical path propagating the second linearly polarized wave and the third linearly polarized wave, and connected to the first optical element and the magnetic field sensor e
    Type: Grant
    Filed: March 31, 2020
    Date of Patent: February 6, 2024
    Assignees: CITIZEN FINEDEVICE CO., LTD., CITIZEN WATCH CO., LTD., SHINSHU UNIVERSITY
    Inventors: Mitsunori Miyamoto, Toshiya Kubo, Toshiroh Sato, Makoto Sonehara
  • Patent number: 11880168
    Abstract: A timepiece according to an embodiment enables a crown to be rotated even when it is locked, using a structure that does not cause constraints of design. The timepiece includes an outer case having a movement therein, the outer case having a crown hole through a portion thereof, an engagement member connected to the outer case, and a crown. The crown includes a shaft part inserted into the crown hole and connected to the movement, an operation part holding the shaft part movably along an axial direction of the shaft part and enabling the shaft part to rotate in a circumferential direction, and an engagement part disposed between the engagement member and the operation part and restricting movement of the operation part in the axial direction when engaged with the engagement member, the engagement part rotatably holding the operation part whether or not engaged with the engagement member.
    Type: Grant
    Filed: March 30, 2020
    Date of Patent: January 23, 2024
    Assignee: CITIZEN WATCH CO., LTD.
    Inventor: Yuji Yahara
  • Patent number: 11855244
    Abstract: 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: Grant
    Filed: November 24, 2021
    Date of Patent: December 26, 2023
    Assignees: Citizen Electronics Co., Ltd., Citizen Watch Co., Ltd.
    Inventors: Jo Kinoshita, Shiori Koike
  • Patent number: 11855575
    Abstract: A step motor drive device includes a step motor including a rotor, stators, and a coil, a drive circuit that outputs a drive signal including a plurality of partial signals that are output intermittently, a detecting circuit that detects an electromagnetic induced current that is generated in the coil after the partial signals are output, and a control unit that controls the drive circuit. The drive circuit outputs one of the partial signals included in the drive signal to the coil, and, in response to a change in an electromagnetic induced current generated in the coil after the partial signal is output, outputs a next partial signal to the coil. The control unit determines a control method of the step motor based on an interval of the plurality of partial signals, and controls the drive circuit based on the determined control method.
    Type: Grant
    Filed: August 26, 2020
    Date of Patent: December 26, 2023
    Assignee: CITIZEN WATCH CO., LTD.
    Inventor: Yu Takyo
  • Publication number: 20230412044
    Abstract: A rotor 10 rotatable around a predetermined centerline direction includes: a columnar magnet 12; and a first rotating shaft 70 with a first columnar part 71 and a cylinder-shaped first cylindrical part 72 covering a part of a first outer circumferential surface 913 of the magnet 12, wherein the first outer circumferential surface 913 of the magnet 12 and a first inner circumferential surface 721 of the first cylindrical part 72 of the first rotating shaft 70 are joined, and a first end surface 912 of the magnet 12 and a first end surface 731 of the first rotating shaft 70 are not joined.
    Type: Application
    Filed: December 22, 2021
    Publication date: December 21, 2023
    Applicants: CITIZEN CHIBA PRECISION CO., LTD., CITIZEN WATCH CO., LTD.
    Inventors: Kazunari OGATA, Takehiro KARIYA, Tomohiro SEIMIYA, Makoto DOI, Shougo KIMURA, Akito TAKENAKA, Katsumoto KATAOKA
  • Patent number: 11848126
    Abstract: A cable stopper structure and an image forming apparatus includes a cable disposed throughout a first passage and a second passage, the second passage having a ceiling height higher than a ceiling height of the first passage, a first component disposed in the first passage and connected to one end portion of the cable, and a second component disposed near an exit of the first passage and connected to the other end portion of the cable, the second component being removable in a direction away from the first component. The cable includes a folded-back portion folded back in the second passage and a rigid portion disposed between the folded-back portion and the first component. The rigid portion has a rigidity greater than that of the cable and has a length in a pulling-out direction of the cable longer than the ceiling height of the first passage.
    Type: Grant
    Filed: November 11, 2019
    Date of Patent: December 19, 2023
    Assignees: CITIZEN WATCH CO., LTD., CITIZEN SYSTEMS JAPAN CO.
    Inventors: Gen Matsushima, Takeo Komiyama, Hiroyuki Yasuda, Katsunori Shimizu
  • Patent number: 11841528
    Abstract: 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: Grant
    Filed: June 25, 2020
    Date of Patent: December 12, 2023
    Assignees: Citizen Electronics Co., Ltd., Citizen Watch Co., Ltd.
    Inventors: Takumi Miyashita, Ryo Tamura, Takahiro Shimizu, Takuma Horiuchi, Ryo Matsuura
  • Patent number: 11820617
    Abstract: A printer includes a reverse bending member that bends a paper toward an opposite side to a curl of the paper, and a bifurcated member to correct the curl of the paper with the reverse bending member. The reverse bending member is disposed between a paper drawing position and a paper feeding roller. The bifurcated member is swingably arranged about a shaft extending in a width direction of the paper. The bifurcated member includes an upstream arm and a downstream arm. The upstream arm has a tip positioned between the rolled paper and the reverse bending member, and moves toward or from the reverse bending member. The downstream arm has a tip positioned between the reverse bending member and the feeding roller to be in contact with the paper, and rotates in accordance with a tension level of the paper to press the upstream arm toward the reverse bending member.
    Type: Grant
    Filed: January 27, 2021
    Date of Patent: November 21, 2023
    Assignees: CITIZEN WATCH CO., LTD., CITIZEN SYSTEMS JAPAN CO., LTD.
    Inventors: Yukihisa Kato, Takeo Komiyama, Kohei Daimon
  • Patent number: 11815840
    Abstract: A printer includes a case including an input port for rolled paper, a cover provided to be rotatable between a closed position of the input port and an open position of the input port, a holding portion that holds the rolled paper, a biasing member that biases the holding portion in a first direction, a stopper mechanism that stops rotation of the holding portion in the first direction, and a linkage mechanism that rotates the holding portion in conjunction with the rotation of the cover. When the cover is in the closed position, the holding portion rotates in the first direction in accordance with an outer diameter of the rolled paper by a biasing force of the biasing member. When the cover rotates from the closed position to the open position, the holding portion rotates together with the cover against the biasing force of the biasing member.
    Type: Grant
    Filed: March 10, 2022
    Date of Patent: November 14, 2023
    Assignees: Citizen Watch Co., Ltd., Citizen Systems Japan Co., Ltd.
    Inventors: Kohei Daimon, Takeo Komiyama, Hiroyuki Yasuda, Katsunori Shimizu
  • Patent number: 11817530
    Abstract: 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: Grant
    Filed: June 28, 2021
    Date of Patent: November 14, 2023
    Assignees: Citizen Electronics Co., Ltd., Citizen Watch Co., Ltd.
    Inventor: Keisuke Sakai
  • Patent number: 11813889
    Abstract: Provided is a method for manufacturing a component provided with a decoration by laser light. The method includes sequentially irradiating a target region in a surface of the component with laser light so as to draw decorative patterns in an overlaid manner, each decorative pattern being composed of a plurality of lines.
    Type: Grant
    Filed: May 8, 2019
    Date of Patent: November 14, 2023
    Assignee: CITIZEN WATCH CO., LTD.
    Inventors: Shosaku Aruga, Isao Setojima
  • Publication number: 20230340353
    Abstract: An industrial oil composition contains a mineral or a synthetic oil as a base oil, and a neutral phosphite ester derivative represented by the following formula (B) and a 2,6-di-t-butylphenol derivative represented by the following formula (C) as antioxidants. In the formula (B), Rb21 to Rb24 each independently represent an aliphatic hydrocarbon group of 10 to 16 carbon atoms. In the formula (C), Rc1 represents a straight-chain or a branched alkyl group of 1 to 12 carbon atoms.
    Type: Application
    Filed: August 31, 2021
    Publication date: October 26, 2023
    Applicant: CITIZEN WATCH CO., LTD.
    Inventor: Yuji AKAO
  • Patent number: 11793448
    Abstract: A detection device detecting changes in positive and negative feelings related to mild cognitive impairment is provided. This detection device includes: a detector detecting heartbeat information of a subject; a calculating unit calculating a maximum Lyapunov exponent from the heartbeat information, the maximum Lyapunov exponent indicating to what extent heartbeat intervals vary; a feeling determination unit determining whether the subject has a negative feeling with brain fatigue, anxiety or depression, or a positive feeling without brain fatigue, anxiety and depression, based on the maximum Lyapunov exponent; a change determination unit determining whether the positive or negative feeling of the subject has changed, based on frequency of occurrence of the negative or positive feeling in a predetermined period; and an output unit outputting a result of determination by the change determination unit.
    Type: Grant
    Filed: October 13, 2017
    Date of Patent: October 24, 2023
    Assignee: CITIZEN WATCH CO., LTD.
    Inventor: Hideki Shimizu
  • Publication number: 20230294227
    Abstract: A tooling exchange mechanism and a machine tool having the tooling exchange mechanism, in which a load applied to a turret is reduced when exchanging a tooling in the machine tool, are provided with a pressing member 210 of a tooling detachment unit 200 that presses the rear end of a tooling holding unit 100 to be able to release the retracted state of a tool holder Th of a tooling T by a tool holder holding portion 150 of the tooling holding unit 100, and a locking lever 220 of the tooling detachment unit 200 engageable with an engaging projection 112a formed on the rear end side of the tooling holding unit 100.
    Type: Application
    Filed: September 30, 2021
    Publication date: September 21, 2023
    Applicants: CITIZEN WATCH CO., LTD., CITIZEN MACHINERY CO., LTD.
    Inventors: Atsushi AOYAGI, Kazutoshi KITAZAWA
  • Patent number: 11756939
    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: Grant
    Filed: April 25, 2022
    Date of Patent: September 12, 2023
    Assignees: Citizen Electronics Co., Ltd., Citizen Watch Co., Ltd.
    Inventors: Yuki Suto, Jo Kinosita
  • Patent number: 11747408
    Abstract: An interference type optical magnetic field sensor device 1 has a light emitter 10 emitting first linearly polarized light, a first optical element 30 emitting a first linearly polarized wave and a second linearly polarized wave orthogonal to the first linearly polarized wave with respect to incident the first linearly polarized light, and emitting a second linearly polarized light with respect to incident third linearly polarized wave and a forth linearly polarized wave orthogonal to the third linearly polarized wave, a magnetic field sensor element 50 disposed at least a portion thereof within a predetermined magnetic field an optical path unit 40 connected to the first optical element and the magnetic field sensor element, and having a first optical path propagating the first linearly polarized wave and the forth linearly polarized wave, and a second optical path propagating the second linearly polarized wave and the third linearly polarized wave, a detection signal generator 60 outputting a detection sign
    Type: Grant
    Filed: August 29, 2019
    Date of Patent: September 5, 2023
    Assignees: CITIZEN FINEDEVICE CO., LTD., CITIZEN WATCH CO., LTD., SIMSHU UNIVERSITY
    Inventors: Mitsunori Miyamoto, Toshiya Kubo, Toshiroh Sato, Yuta Fujishiro, Makoto Sonehara
  • Patent number: 11733069
    Abstract: The range of operating angles of a position transducer is widened, and its signal-to-noise ratio is improved. The position transducer includes a light source and a detector including at least one pair of photodiodes (PDs) disposed on a predetermined circle. The detector receives light emitted from the light source to output a signal varying depending on the areas of regions where the light is received on two PDs forming a pair. The PDs are formed on separate chips, respectively, and the chips are disposed on a substrate so that one or more pairs of PDs surround the entirety of a predetermined region and have an annular shape as a whole.
    Type: Grant
    Filed: March 9, 2021
    Date of Patent: August 22, 2023
    Assignees: CITIZEN CHIBA PRECISION CO., LTD., CITIZEN WATCH CO., LTD.
    Inventors: Kazunari Ogata, Shougo Kimura, Kaori Funatsu
  • Patent number: D1019418
    Type: Grant
    Filed: March 31, 2021
    Date of Patent: March 26, 2024
    Assignee: CITIZEN WATCH CO., LTD.
    Inventor: Toshihiko Kita