CITIZEN WATCH CO., LTD.
|CITIZEN WATCH CO., LTD. Patent applications|
|Patent application number||Title||Published|
|20150241847||HAIRSPRING MATERIAL FOR MECHANICAL TIMEPIECE AND HAIRSPRING USING THE SAME - [Problem] To provide a hairspring material for a mechanical timepiece, a variation in Young's modulus of which can be made smaller than that of conventional ones. [Solution] The hairspring material for a mechanical timepiece of the present invention comprises an alloy which contains 37.5 to 39.5% by mass of Ni, 9.2 to 9.9% by mass of Cr, 0.35 to 0.55% by mass of Ti and 0.6 to 0.9% by mass of Be, based on the total amount of the alloy, and contains a remainder including Fe and unavoidable impurities, said alloy being an alloy containing, as the unavoidable impurities, C (carbon), Mn in an amount of more than 0% by mass but not more than 0.5% by mass and Al in an amount of more than 0% by mass but less than 0.03% by mass, the amount of said C (carbon) being limited to not more than 0.03% by mass.||08-27-2015|
|20150072138||RIGID DECORATIVE MEMBER HAVING WHITE RIGID COATING LAYER, AND METHOD FOR PRODUCING THE SAME - A rigid decorative member of the present invention is a rigid decorative member comprising a base and a rigid coating layer laminated on or above the base, wherein the rigid coating layer comprises a reaction compound of raw metal, in which a metal M1 and a metal M2, and in addition, selectively a metal M3 are combined, and of a non-metallic element selected from one or two or more of nitrogen, carbon, and oxygen, or comprises an alloy in which a metal M1 and a metal M2, and in addition, selectively a metal M3 are combined; the metal M1 is selected from one or two of Mo and W; the metal M2 is selected from one or two or more of Nb, Ta, and V; and the metal M3 is selected from one or two or more of Cr, Ti, Hf, and Zr.||03-12-2015|
|20140086023||ELECTRONIC WATCH - Provided is an electronic watch capable of surely acquiring a movement start position and a stop position of a hand when the hand moves at high speed such as a case of manual correction by a winding stem or the like, while reducing a load on a CPU. The electronic watch includes: a decode circuit for outputting data corresponding to regions acquired by segmenting a movement range of the hand; and a position information circuit for automatically acquiring region data corresponding to the movement start position of the hand and region data corresponding to the stop position thereof and sending a notification to the CPU when acquiring both the data. In this manner, the CPU can stop until the acquisition of both the data, thereby reducing the load on the CPU.||03-27-2014|
|20140016440||RADIO-CONTROLLED WRISTWATCH - Provided is a radio-controlled wristwatch that receives a radio wave including day-related information from a satellite within a global positioning system, in which a cycle number of the day-related information is correctly updated even in a case where a power supply voltage drops. A radio-wave wristwatch (||01-16-2014|
|20130171448||WHITE HARD DECORATIVE MEMBER - In order to provide a white hard decorative member being remarkably enhanced in scratch resistance and abrasion resistance and having a high-quality color impression, and furthermore supply a product capable of freely controlling the color tone, corrosion resistance performance, and etching performance, the white hard decorative member includes a base material having thereon an alloy adherence layer having a high adherence effect, an alloy gradient adherence layer in which the reaction gas content is gradually increased, an abrasion-resistant layer having high hardness, and an alloy color-up gradient layer in which the reaction gas content is gradually decreased, which are formed by using a film of an alloy combining a metal having a high adherence effect to a metal and high brightness, a metal having high film hardness and high corrosion resistance, and a metal for enhancing the corrosion performance.||07-04-2013|
|20130094333||TIMEPIECE DISPLAY PLATE - A timepiece display plate, while obtaining reflection light having metal texture, allows partial light as a transmissive light to transmit to a solar cell and easily adapt to various types of dial plates. A timepiece display plate (||04-18-2013|
|20130016589||RADIO-CONTROLLED TIMEPIECEAANM Takada; AkinariAACI TokyoAACO JPAAGP Takada; Akinari Tokyo JPAANM Ike; TakujiAACI TokyoAACO JPAAGP Ike; Takuji Tokyo JP - A radio-controlled timepiece includes an oscillator circuit of which an oscillation condition can be varied by an oscillation condition adjustment circuit that adjusts an oscillation frequency, a frequency divider circuit that divides the oscillation frequency and generates a time measurement reference timing signal, a frequency adjustment circuit that adjusts the period of time measurement reference timing signal, a local oscillator circuit that uses the oscillation frequency as a reference frequency and outputs a local oscillation frequency, and a control circuit. The control circuit, when the radio-controlled timepiece is performing reception operations, causes the oscillation condition adjustment circuit to operate whereby the oscillation frequency is adjust to an optimal frequency for the local oscillator circuit and the variation setting value of the frequency adjustment circuit is set such that time measurement reference timing signal has a fixed period for normal operations and for reception operations.||01-17-2013|
|20130009816||SATELLITE RADIO-CONTROLLED WATCH - Provided is a satellite radio-controlled watch, which is capable of holding back a receiving operation when in a posture that does not allow normal reception of a satellite signal, and is capable of performing a receiving operation under conditions varied to suit the type of reference information to be obtained. The satellite radio-controlled watch includes: a reception circuit (||01-10-2013|
|20120307602||ELECTRONIC WATCH - When recovering power from a motor driver, a forward voltage across a parasitic diode can reduce the recovery efficiency, and control of a power recovery operation can take an unnecessarily long time. In order to address this problem, the power recovery operation is performed as follows without being affected by a parasitic diode: near a peak position of a waveform of an induced current resulting from free oscillation of a rotor after a drive pulse is output, a recovery pulse having such a level that the rotor does not rotate is output from a terminal different from a motor driver terminal to which the drive pulse was output. Also, by adjusting the width and output timing of the recovery pulse based on a power supply voltage, the power recovery can be optimized for the power supply voltage.||12-06-2012|
|20120300597||ELECTRONIC TIMEPIECE - Lubricating apparatuses (||11-29-2012|
|20120204640||ELECTRONIC WATCH - Provided is an electronic watch capable of, even if an indicating hand having a large moment of inertia is used, accurately determining success and failure of rotation. The electronic watch detects rotation by using a first detection mode determination circuit (||08-16-2012|
|20080284926||Liquid Crystal Display Device - A liquid crystal display device is provided with a liquid crystal display panel (||11-20-2008|
Patent applications by CITIZEN WATCH CO., LTD.