The Pilot Ink Co., Ltd.

Takeo Yamaguchi

Yoshiaki Ono

Tsutomu Tomatsu

Kyoji Aoyama

Tanehiro Nakagawa

Toshiaki Tanaka

There is disclosed an electrothermal color-varying device inducing color change in a thermally color-varying layer by heat generation in an electrothermal heat-generating member, in which the heat-generating member is composed of a non-metallic member having a positive temperature coefficient on the electric resistance at least in a temperature range 25.degree. C. to 65.degree. C. and a particular volume resistivity, is adapted to generate heat by the application of a low voltage and is capable of self-control of the saturated heating temperature at an arbitrary temperature within a range of 25.degree. C. to 65.degree. C., whereby improved safety is achieved without the danger of overheating or current leakage. Also there are disclosed toys utilizing such color-varying device.

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Nagoya, Japan

Takeo Yamaguchi