Kabushiki Kaisha Toshiba

Takeshi Udagawa

Hironori Suzuki

Toshiya Imai

Hiroyoshi Narita

Yoshiyasu Itoh

Hideyasu Ando

Yoshiyasu Ito

Masahiro Hanai

Takahiko Shindo

Hideyasu Andoh

Yoshihiko Hirano

Nobuyuki Shimizu

Yasuhiko Taniguchi

Yasunori Kasuga

Yoshikazu Tanno

Masahiro Kan

Koji Higashibata

Kiyokazu Umehara

Yoshihiro Ishizaki

Masahiko Ebina

Keisuke Shimagami

Yoshlyasu Ito

A current/voltage non-linear resistor comprises a sintered body having a main component of ZnO, an electrode applied to a surface of the sintered body and an insulation material applied to another surface of the sintered body. The main component containing, as auxiliary components, Bi, Co, Mn, Sb, Ni and Al, and the contents of the auxiliary components are respectively expressed as Bi O , Co O , MnO, Sb O , NiO and Al , of Bi O : 0.3 to 2 mol %, Co O : 0.3 to 1.5 mol %, MnO: 0.4 to 6 mol %, Sb O : 0.8 to 7 mol %, NiO: 0.5 to 5 mol % and Al : 0.001 to 0.02 mol %; a Bi O crystalline phase in the sintered body including an &agr;-Bi O phase representing at least 80% of the total Bi O phase.

Current/voltage non-linear resistor and sintered body therefor

A voltage nonlinear resistor has a voltage nonlinear resistive body including zinc oxide, and a side face high-resistance layer provided on the side face of the resistive body. The high-resistance layer contains zinc in an amount of 1.0 to 25% by weigh in terms of its oxide (ZnO), boron in an amount of 1.0 to 10% by weight in terms of its oxide (B O ), silicon in an amount of 0.1 to 5% by weight in terms of its oxide (SiO ), aluminum in an amount of 0.05 to 3% by weight in terms of its oxide (Al O ), and barium in an amount of 0.05 to 3% by weight in terms of its oxide (BaO), with bismuth being substantially the balance in terms of its oxide (Bi O ).

Voltage nonlinear resistor

A voltage non-linear resistor unit is composed of at least one of voltage non-linear resistors which is composed of a columnar sintered body formed by molding and sintering a raw material, the sintered body having both end surfaces having a surface roughness in term of arithmetic average surface roughness Ra of 1 to 2 &mgr;m and being formed with an electrode film layer, a terminal metal fitting formed in a predetermined shape and attached to the voltage non-linear resistor, and a soldering material arranged between the voltage non-linear resistors and between joint surfaces of the voltage non-linear resistor and the terminal metal fitting, the joint surfaces being joined by heating the soldering material and applying a load vertically to the joint surfaces while giving a rotation motion thereto. Such voltage non-linear resistor is effectively assembled into an arrester.

Voltage non-linear resistor unit and arrester unit

Growing community of inventors

Kisarazu, Japan

Takeshi Udagawa