Tokyo Shibaura Denki Kabushiki Kaisha

Mituo Harata

Masaki Katsura

Masayuki Shiratori

Shigeki Uno

Osamu Takikawa

Hideaki Hiraki

Kazuo Sakuma

Takashi Takahashi

Atsuo Imai

Hiromichi Nei

Susumu Ninomiya

Youhachi Yamashita

Fumio Ohtsuka

Kiyosi Matsunaga

There is disclosed a high dielectric constant material which comprises a composite material comprising at least one of BaO and CaO; PbO; Fe.sub.2 O.sub.3 ; Nb.sub.2 O.sub.5 ; WO.sub.3 and CuO, said composite material being represented by the general formula:

High dielectric constant type ceramic composition

A humidity-sensitive element comprises a humidity-sensitive body which includes 21-73 mol % of Cr.sub.2 O.sub.3, 25-55 mol % of at least one member selected from the group consisting of ZnO and MgO, 0.5-8.0 mol % of CuO, 0.5-8.0 mol % of Li.sub.2 O, and 0.5-8.0 mol % of V.sub.2 O.sub.5, and a pair of electrodes attached to the body. Such an element provides excellent stability over a wide range of humidity and temperature levels.

Humidity-sensitive resistive element

A humidity-sensitive element which has excellent humidity-sensitive characteristics and has a small drift after being exposed to a high humidity for a long period of time. The humidity-sensitive element of the invention includes a porous metal oxide sintered body, a simple substance or an oxide of phosphorus or sulfur carried on the porous metal oxide sintered body, and copper ions carried on the porous metal oxide sintered body.

Humidity-sensitive element and process for producing the same

A cation emission type halogenated hydrocarbon gas detecting element comprising a cation source, a heating means and an ion collector electrode, which is characterized in that said cation source consist essentially of .beta.-Al.sub.2 O.sub.3, wherein substantially all cation species occupy a position in the crystal lattice structure of the source. By employing .beta.-Al.sub.2 O.sub.3, the detecting element can be more miniaturized and can work at lower temperature than a conventional cation emission type electrode comprising the cation source made of steatite.

Cation emission type halogenated hydrocarbon gas detecting element

Disclosed is a gas leak detector comprising; a tubular gas-sensitive element defining openings at both ends thereof, one end being a gas inlet and the other end a gas outlet, and made of an oxygen-ion conductive solid electrolyte; a set of electrodes provided respectively on the inner and outer walls of the gas-sensitive element, the electrode on the outer wall being kept in contact with a reference gas; a heater adapted to heat the gas-sensitive element to a predetermined temperature at a location corresponding to the set of electrodes; and a catalytic layer provided on the surface of the electrode on the inner wall being kept in contact with a target gas.

Gas leak detector

A moisture sensitive element for detecting humidity variations through sensing variations in electric resistance using a porous metal oxide ceramic. At least either phorphorus or sulfur is incorporated in and supported by the porous metal oxide ceramic with the phosphorus or sulfur being applied in either a pure or oxide form.

Moisture sensitive element

A unit for measuring the alkali metal vapor concentration of a gaseous phase, comprising

Growing community of inventors

Kawasaki, Japan

Mituo Harata