Mitsubishi Materials Corporation

Yasuhiro Shato

Toshiaki Ueda

Miki Adachi

Takashi Kurihara

Sung-Gyoo Lee

Tsuyoshi Ogi

Tuyoshi Ogi

Kouichirou Harada

Kouichirou Mitsubishi Materials Corp Harada

Tsuyoshi Mitsubishi Materials Corp Ogi

A surge protector coated with an oxide layer having an excellent chemical stability at the high temperature range and excellent adherence with respect to main discharge electrodes. The surge protector includes a column-shaped ceramic member that has a conductive film divided by a discharge gap interposed therebetween; a pair of main discharge electrode members opposite to each other on both ends of the column-shaped ceramic member to come in contact with the conductive film; and a cylindrical ceramic tube which is fitted to the pair of main discharge electrode members opposite to each other to seal both the column-shaped ceramic member and sealing gas inside thereof. Oxide films are formed on main discharge surfaces of at least the protrusive supporting portions of the pair of main discharge electrode members opposite to each other, by performing an oxidation treatment, respectively.

Method of forming a surge protector

This surge absorber includes an insulating part upon which is formed a conductive layer which is divided into two separate portions by a discharge gap (micro gap) around its circumferential surface; a pair of terminal electrodes which are arranged to oppose the insulating part, and contacts the conductive layer; an insulating tube at the ends of which the terminal electrodes are arranged, and which seals the insulating part in its interior along with seal gases; and a conductive portion provided at least between the terminal electrodes and the conductive layer. As a result, it becomes possible to provide a surge absorber of lower cost, and which is endowed with stabilized performance and high quality, while moreover it exhibits excellent durability.

Surge absorber and production method therefor

In a surge absorber, a pair of protrusion electrodes is fixed to a pair of terminal electrode members at positions shifted from the center of the terminal electrode members to be point-symmetrical with the center of a ceramic insulator tube and a distance between the protrusion electrodes is adjusted so as to obtain a desired discharge starting voltage. As a result, it is possible to easily change the distance between the discharge electrodes without changing the length of the discharge electrodes.

Surge absorber

Surge protector

Growing community of inventors

Yokoze-machi, Japan

Yasuhiro Shato