Hitachi, Ltd.

Keiji Mori

Yasunori Narizuka

Akira Uchikawa

Tsuneaki Kamei

Akira Yabushita

Shoichi Sakai

Masao Tsukada

Mamoru Morita

Masami Kawashima

An oxygen sensor includes a tubular casing; an oxygen detecting element installed in a leading end of the tubular casing; lead wires each extending from the oxygen detecting element to the outside of the tubular casing through an open base end of the tubular casing, each lead wire including a core wire of metal; a rubber bush plugged in the open base end of the tubular casing, the rubber bush having the lead wires passed therethrough; and a heat resisting structure for protecting the rubber bush from a high temperature. The heat resisting structure is constructed to satisfy the following inequality:10%&#x2266;50%,

Oxygen sensor

A circuit substrate, such as a thermal printing head, having electrodes made of a material suitable for soldering. The electrode to be soldered, at least in part, is composed of an alloy of Ni and Cu, whose composition ranges from 65 mol % Ni - 35 mol % Cu to 75 mol % Ni - 25 mol % Cu.

Circuit substrate and thermal printing head using the same

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Gunma, Japan

Keiji Mori