Electrothermal color-varying instrument

Details Electrothermal color-varying instrument Electrothermal color-varying instrument

H - Electricity

05

B

H05B 3/12 (2006.01) A63H 33/00 (2006.01) A63H 33/22 (2006.01) H05B 3/14 (2006.01)

Patent

CA 2050233

An electrothermal color-varying instrument for inducing color change. in a thermal color-varying layer provided in a toy, a picture book, a teaching aid, a writing board has an electrothermal heat-generating element serving as a heat source which is composed of a thermistor which has: (i) a positive temperature coefficient on the electrical resistance within a temperature range from 25°C to 70°C; (ii) a volume resistivity at 25°C (p25) within a range of 9.8 x 10 -3 to 2.97 x 10 5 .OMEGA.~cm; and (iii) a ratio (p70/p25) of the volume resistivity at 70°C to that at 25°C within a range of ~ (p70/p25) ~ 400; and which is adapted to generate heat under the application of a voltage in a range of 0.8 to 40 V and is capable of temperature self-control whereby the saturated heating temperature is maintained at an arbitrary temperature within a range of 30°C to 100°C.

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