Citizen Holdings Company, Ltd.

Other

Hitachi Metals, Ltd.

Citizen Watch Company, Ltd.

Hitachi Metals Neomaterial, Ltd.

Yoshirou Hirai

Junji Satoh

Ikuo Takahashi

Shinji Ogawa

Junji Sato

Naoto Ogasawara

Yoji Hasegawa

Makoto Furukawa

Nobuyuki Yoshino

Kuniyasu Kobayashi

Shinji Yamamoto

Daichi Imabayashi

Shinichi Matsumoto

Kenji Tsuchiya

A hairspring material for a mechanical timepiece includes 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 in the remainder Fe and unavoidable impurities, the 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 the C (carbon) being limited to not more than 0.03% by mass. The hairspring material can provide a smaller variation in Young's modulus than that of conventional hairspring materials.

Hairspring material for mechanical timepiece and hairspring using the same

A lead portion () of a heater coil () is constituted of a single coil wound into a coil and a bead portion () is constituted of a double coil formed by further winding the single coil into a coil. By constituting a detecting element () by burying the bead portion () in a heat conductive layer () and adhering a catalyst layer () on the surface of the heat conductive layer (), improvement of the gas sensitivity and the response speed of a catalytic combustion gas sensor is facilitated. Zero point variation is reduced by improving impact resistance. When both ends of the heater coil are fixed to electrode pins, both ends of the heater coil are welded to the electrode pins using a resistance welding method, etc., with a platinum wire, etc., wound on a primary core wire, and thereafter, the primary core wire is melted and eliminated while leaving the platinum wire, etc., by a wet etching process.

Heater coil for gas sensor, detecting element for gas sensor, catalytic combustion gas sensor, and manufacturing method of catalytic combustion gas sensor

Heater coil for gas sensor, detection element for gas sensor, contact combustion type gas sensor, and method for manufacturing contact combustion type gas sensor

An impregnated cathode and a method of manufacturing the same are provided for suppressing emission of unwanted electrons and particles generated from an excess electron emitting substance so as to achieve a steady electron emission characteristic. The impregnated cathode is placed directly beneath an electron emission hole of a first grid. The impregnated cathode is made up of a first sintered porous element whose surface functions as an electron emitting region and a second sintered porous element whose surface is a peripheral region other than the electron emitting region. The porosity of the first sintered porous element is greater than that of the second sintered porous element. Not only the first sintered porous element having the electron emitting region but also the second sintered porous element corresponding to the region around the electron emitting region is impregnated with the electron emitting substance. In addition, the amount of the electron emitting substance per unit volume contained in the first sintered porous element is greater than that contained in the second sintered porous element.

Impregnated cathode and method of manufacturing same, electron gun and electron tube

Impregnated cathode having varying surface porosity

Growing community of inventors

Saitama, Japan

Yoshirou Hirai