Patents Assigned to Citizen Watch Co., Ltd.
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Patent number: 11687035Abstract: A display panel includes a plate-shaped decoration member including a shading part and a light transmission part formed within the shading part, as well as a plate-shaped reflection member disposed on a back side of the decoration member. The shading part and the light transmission part create a fine pattern in plan view. The reflection member is configured to reflect light. The decoration member is disposed on a front surface of the reflection member.Type: GrantFiled: July 30, 2019Date of Patent: June 27, 2023Assignee: Citizen Watch Co., Ltd.Inventors: Shinji Satoh, Motoyoshi Itoh
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Patent number: 11681260Abstract: 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: GrantFiled: September 6, 2019Date of Patent: June 20, 2023Assignee: CITIZEN WATCH CO., LTD.Inventors: Toshinari Maeda, Shogo Kimura
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Publication number: 20230182230Abstract: A machine tool and a control method for the machine tool, which determine the degree of misalignment during friction joint, are provided. The machine tool (an automatic lathe 1) includes: a first spindle 10 rotatably holding a first workpiece (a workpiece W1); a second spindle 20 arranged to face the first spindle and rotatably holding a second workpiece (a remaining workpiece W2); and a controller 40a, while rotating at least one of the first workpiece or the second workpiece, relatively moving the first spindle and the second spindle so as to get closer to each other and pushing a rear end portion of the second workpiece against a front end portion of the first workpiece to frictionally join the first and second workpieces. The controller has a misalignment amount detector detecting a misalignment amount s of the second workpiece with respect to the first workpiece during the friction joint.Type: ApplicationFiled: June 28, 2021Publication date: June 15, 2023Applicant: CITIZEN WATCH CO., LTD.Inventor: Ayako KITAKAZE
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Patent number: 11656580Abstract: An electronic watch includes a power generating mechanism; a battery that is charged with power generated by the power generating mechanism; hands that include a second hand; a driving source that rotates the hands; a driving circuit that drives the driving source with power supplied by the battery; and a control circuit that controls the driving circuit. The control circuit executes a first stopping operation for stopping the driving circuit and the control circuit in a power saving mode for suppressing power consumption and when a first determination time elapses without any power being generated by the power generating mechanism. The control circuit executes a second stopping operation for stopping the driving circuit and the control circuit in the power saving mode and when a second determination time elapses while a voltage of the battery is at a level equal to or lower than a predetermined level.Type: GrantFiled: March 26, 2019Date of Patent: May 23, 2023Assignee: CITIZEN WATCH CO., LTD.Inventors: Shogo Kimura, Akinari Takada
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Patent number: 11656582Abstract: A radio wave watch includes: an exterior case; a dial plate disposed within the exterior case; a substrate disposed on a rear side of the dial plate within the exterior case; a first ground layer disposed on the substrate; an antenna that has a planar emitting electrode disposed between a center of the exterior case and an inner wall surface of the exterior case and opposed to the first ground layer, a planar short-circuit part electrically connecting an end part of the emitting electrode to the first ground layer, and a connecting part connecting the emitting electrode to a receiving circuit of the substrate; and a second ground layer disposed on an opposite side to the emission electrode side across the short-circuit part on the substrate and having a width equal to or greater than a width of the short-circuit part.Type: GrantFiled: September 18, 2018Date of Patent: May 23, 2023Assignee: CITIZEN WATCH CO., LTD.Inventors: Yoshiyasu Watanabe, Ken Kitamura, Shuji Naka, Akira Kato
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Patent number: 11650548Abstract: Provided is a watch, including: an exterior case having electroconductivity; an operating member having electroconductivity, which is inserted into the exterior case through an opening formed through the exterior case, and which is configured to accept an operation performed by a user; and an electrostatic motor including: an electret substrate having an electret surface on which electret films being electrically charged are provided; a counter substrate, on which electrodes to be arranged so as to be opposed to the electret films are provided; and a rotary shaft configured to rotate the electret substrate and the counter substrate relative to each other, wherein the operating member and the exterior case are electrically continuous with each other via a conduction path formed so as to avoid overlapping with the electret surface in plan view.Type: GrantFiled: March 11, 2020Date of Patent: May 16, 2023Assignee: CITIZEN WATCH CO., LTD.Inventors: Kenji Shimoda, Yasuo Kitajima, Daisuke Tokunaga, Shinnosuke Sakata, Koki Mine, Yuta Furudate, Kazutaka Igarashi
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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: 11614713Abstract: Provided is a timepiece including: hands being an hour hand, a minute hand and a second hand; a movement for driving the hands; a first dial; a first dial ring having upper and lower surfaces provided with an upper projection and a lower projection, respectively, the first dial ring being disposed on the first dial and positioned relative to the first dial by the lower projection; and a transparent second dial disposed on the first dial ring and positioned relative to the first dial ring by the upper projection, wherein one of the hands is disposed between the first dial and the second dial, while the others of the hands are disposed above the second dial.Type: GrantFiled: December 20, 2019Date of Patent: March 28, 2023Assignee: CITIZEN WATCH CO., LTD.Inventors: Akihiko Kuroda, Kazuki Tada, Yuya Matsushita, Setsuo Kachi
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Publication number: 20230050486Abstract: A machining device threads a workpiece by relatively rotating the workpiece and a multi-blade tool and relatively moving them along a feed direction to perform cutting processes in the radial direction of the workpiece along the same cutting path in a predetermined spiral form. A controller performs a groove machining to form a threaded portion with vibration in the radial direction of the workpiece and a finish machining to form the threaded portion by bringing the multi-blade tool into contact with the grooved portion of the workpiece. The multi-blade tool has a first cutting blade and a second cutting blade arranged side by side along the feed direction. The controller sets amplitude of a vibration waveform to a value at which a cutting edge of the second cutting blade does not come into contact with the screw bottom surface of the workpiece in the finish machining.Type: ApplicationFiled: November 30, 2020Publication date: February 16, 2023Applicants: CITIZEN WATCH CO., LTD., CITIZEN MACHINERY CO., LTD.Inventors: Kazuhiko SANNOMIYA, Shinichi MUTOU
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Patent number: 11567454Abstract: Provided is an electromechanical transducer to be detachably attached to an electronic device, the transducer including: first and second plates; a rotor rotating around a rotating shaft supported by the plates; a fixed substrate disposed between the plates and facing the rotor; a charged portion having sub-regions disposed on the rotor at intervals in a rotating direction thereof so as to face the fixed substrate; an opposing electrode disposed on the fixed substrate so as to face the rotor; an adjusting unit for adjusting sliding properties of the rotating shaft, the adjusting unit being provided for at least one of the plates; and a gear train coupled to the rotating shaft. The gear train transmits motive power generated by the rotor rotated by electric power of the electronic device to the electronic device or transmits motive power generated by a change in orientation of the electronic device to the rotor.Type: GrantFiled: December 21, 2019Date of Patent: January 31, 2023Assignee: CITIZEN WATCH CO., LTD.Inventors: Yasuo Kitajima, Kenji Shimoda, Shinnosuke Sakata, Daisuke Tokunaga
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Patent number: 11563386Abstract: Provided are an electromechanical transducer including a light movable member that is easy to move and charged portions whose amount of electrostatic charge does not substantially change over time and a method for manufacturing such an electromechanical transducer.Type: GrantFiled: October 5, 2018Date of Patent: January 24, 2023Assignee: CITIZEN WATCH CO., LTD.Inventors: Tomoo Ikeda, Izumi Yamamoto, Takuya Shirai, Yudai Hoshi
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Patent number: 11554420Abstract: Disclosed are threading device and threading method, including a turning step for threading a rotating workpiece with a predetermined cutting depth, by relatively moving a tool in the axial direction of the workpiece and then rounding-up the workpiece obliquely by relatively moving the tool in the axial direction and radially outward. The workpiece is subjected to the threading process by repeatedly carrying out the turning step while sequentially shifting the axial position for starting the rounding-up of the workpiece relative to an axial position where the rounding-up of the workpiece has been started in a previous turning step.Type: GrantFiled: June 21, 2018Date of Patent: January 17, 2023Assignees: CITIZEN WATCH CO., LTD., CITIZEN MACHINERY CO., LTD.Inventors: Hikaru Takahashi, Tamotsu Katsuta
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Patent number: 11556091Abstract: A timepiece includes a dial plate including a first index on a radial virtual line outwardly extending from a center; and a circular case ring disposed outside of the dial plate, the circular case ring including a second index arranged in series with the first index on the line, wherein the second index includes a proximal end facing the first index; and a distal end opposite the proximal end, wherein a width of the proximal end is wider than that of the distal end in a plan view as seen in a height direction of the dial plate, and wherein the width of the proximal end of the second index is wider than that of a proximal end of the first index facing the second index.Type: GrantFiled: February 25, 2019Date of Patent: January 17, 2023Assignee: Citizen Watch Co., Ltd.Inventors: Kaori Aoba, Yasushi Tomiyama, Hideki Inoue
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Patent number: 11537093Abstract: A mobile device includes a drive unit for which correspondence between a command that is input and a drive signal that is output to an operation unit is predetermined, and a controller configured to output the command to the drive unit and cause the operation unit to operate. The controller includes a storage unit storing therein a user program including script language and outputs the command in accordance with the user program.Type: GrantFiled: March 5, 2020Date of Patent: December 27, 2022Assignee: CITIZEN WATCH CO., LTD.Inventors: Daisuke Matsuoh, Ryutaro Uemura
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Patent number: 11517990Abstract: A machine tool (1) includes a spindle (32) supported on a support surface (37a) of a support body (37) with such an orientation that the longitudinal axis of the spindle extends along the support surface (37a). The spindle (32) is movable in a vertical direction that is perpendicular to the longitudinal axis of the spindle (32). The support body (37) is provided with a ventilation hole (80) extending through the support body (37) between the support surface (37a) and a surface (37b) facing in the direction opposite to the support surface (37a), to open toward the spindle (32).Type: GrantFiled: October 3, 2018Date of Patent: December 6, 2022Assignees: CITIZEN WATCH CO., LTD., CITIZEN MACHINERY CO., LTD.Inventors: Koichi Yabe, Yosuke Ando, Yosuke Wada, Wataru Katagishi
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Patent number: 11517991Abstract: A machine tool includes: a cutting tool; rotating means; feeding means; and vibration means for reciprocatingly vibrating the cutting tool and the workpiece relative to each other; wherein the cutting process is carried out by a relative rotation of the workpiece and the cutting tool, and feeding of the cutting tool, to thereby move the cutting tool continuously along a plurality of predetermined movement paths each having a different machining feeding direction. The machine tool further includes vibration restriction means that operates as the movement of the cutting tool changes from one movement path of two consecutive movement paths to the other movement path, for restricting the reciprocating vibration for a predetermined period from the movement starting position of the movement paths, and starting the reciprocating vibration after the lapse of said predetermined period.Type: GrantFiled: October 4, 2018Date of Patent: December 6, 2022Assignees: CITIZEN WATCH CO., LTD., CITIZEN MACHINERY CO., LTD.Inventors: Takaichi Nakaya, Kazuhiko Sannomiya, Hiroshi Shinohara
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Patent number: 11506555Abstract: In piezoelectric sensors, conventional amplification factor adjustment methods involving the cutting of a wiring pattern or use of a laser trimmable resistor are unable to adjust the amplification factor when the sensor is in a completed state. As a result, the production process becomes complex and production costs increase. Further, because the amplification factor adjustment is carried out in a different state from that of the finished product, the problem that the amplification factor is not set correctly in the finished product also occurs. A non-volatile memory is incorporated in an integrated circuit in which there are integrated piezoelectric sensor circuit elements. The amplification factor is adjusted by writing data from a writing terminal to change an amplification resistor a.Type: GrantFiled: March 21, 2017Date of Patent: November 22, 2022Assignees: CITIZEN FINEDEVICE CO., LTD., CITIZEN WATCH CO., LTD.Inventors: Rikoku Nakamura, Masanori Yomoyama
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Publication number: 20220355390Abstract: A chuck device for holding a plate material workpiece supplied to a machine tool without deforming the workpiece is provided. A housing has a workpiece contact surface arranged to face workpiece holding claws, and when holding of a workpiece is released, a plurality of rods integrally swings so that the workpiece holding claws are moved away from the workpiece contact surface of the housing and moved away from each other, and when holding the workpiece, after the plurality of rods integrally swing so that the workpiece holding claws are brought close to the workpiece contact surface of the housing and brought close to each other, the plurality of rods moves integrally in parallel with the forward/backward moving direction of a drive body to bring the workpiece holding claws into contact with the workpiece.Type: ApplicationFiled: November 6, 2020Publication date: November 10, 2022Applicants: CITIZEN WATCH CO., LTD., CITIZEN MACHINERY CO., LTD.Inventors: Sakae NAKAZAWA, Masao SAKAI
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Machine tool system that restricts parallel execution of predetermined operations by different tools
Patent number: 11491548Abstract: The machine tool includes modules and a control portion. Each of the modules includes a main spindle for holding a workpiece and a tool post for holding a tool. The tool is used to machine the workpiece held by the main spindle. The control portion is configured to control to restrict a parallel execution of predetermined machining for the workpiece and machining affected by the predetermined machining and to permit an execution of machining other than the restricted machining.Type: GrantFiled: September 6, 2018Date of Patent: November 8, 2022Assignees: Citizen Watch Co., Ltd., Citizen Machinery Co., Ltd.Inventor: Shozen Yanakawa -
Patent number: D989011Type: GrantFiled: July 23, 2021Date of Patent: June 13, 2023Assignees: Citizen Electronics Co., Ltd., Citizen Watch Co., Ltd.Inventor: Takashi Iino