Hitachi, Ltd.

Tanaka Matthey Co., Ltd.

Sadayoshi Taguchi

Kazutaka Sato

Michihiro Watanabe

Munetoshi Zen

Yoshinobu Watanabe

Kazuhiko Ato

A thermal head obtained by calcining a mixed material comprising at least ruthenium oxide particles having specific surface area of 10 to 45 m.sup.2 /g and a particle size of 1 .mu.m as the upper limit value of particle size distribution, glass fine particles and a dispersant which disperses these fine particles and disappears by calcining can reduce scattering of resistance values and give high image quality at thermal printing.

Thick film resistor material and thermal head obtained therefrom

A thermal head obtained by calcining a mixed material comprising at least ruthenium oxide particles having a specific surface area of 10 to 40 m.sup.2 /g and a particle size of 1 .mu.m as the upper limit value of particle size distribution, glass fine particles and a dispersant which disperses these fine particles and disappears by calcining can reduce scattering of resistance values and give high image quality at thermal printing.

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Hadano, Japan

Sadayoshi Taguchi