Mitsubishi Materials Corporation

Mitsubishi Mining and Cement Co. Ltd.

Takashi Kurihara

Toshiaki Ueda

Miki Adachi

Yasuhiro Shato

Sung-Gyoo Lee

Takaaki Ito

Tuyoshi Ogi

Hiroyuki Ikeda

Takashi Shibayama

Tsuyoshi Ogi

Naoyuki Tomita

Tomio Iwata

Naruo Yoshioka

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

Surge protector

A circuit for protecting a semiconductor circuit or a telephone communication line from a lightning surge or overvoltage or overcurrent condition. The circuit incorporates a two-terminal surge absorbing device arranged in parallel with the circuit or line to be protected, a thermistor having a high positive temperature coefficient, arranged in series to the circuit or line, between the electric source and the surge absorbing means, and a resistor connected in series with the circuit or line.

Circuit for protecting electronic equipment from overvoltage or

A protection structure for a surge absorbing element for protecting equipment such as communications lines from surges caused by lightning or the like which makes use of a surge absorbing element in parallel with the equipment to be protected and a low melting point metal wire in direct contact with the element and in series therewith. The structure protects the surge absorbing element or assembly from continuous overvoltage or overcurrent which may be generated by a short-circuit of an alternating electric current source and the like.

Protection structure for surge absorbing element

Growing community of inventors

Yokoze-machi, Japan

Takashi Kurihara