PTC thermistor elements and heating devices incorporating same

Details PTC thermistor elements and heating devices incorporating same PTC thermistor elements and heating devices incorporating same

1999-03-01

2000-11-14

Paschall, Mark

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219504, 219552, 219540, 338 22R, 296101, H05B 102

Patent

active

061473308

ABSTRACT:
A PTC thermistor element for a heating device has a main body of a layered structure having a thinner layer and a thicker layer, sandwiched between electrodes formed on the main outer surfaces facing away from each other. The thinner layer has a thickness 0.05-0.43 times that of the thicker layer and is made of a PTC thermistor material with a Curie temperature which is lower than that of the thicker layer by 20.degree. C. or more. The center of heat generation is thus shifted towards the electrode formed on the thinner layer, and a heating plate contacting it can be effectively heated.

REFERENCES:
patent: 4017715 (1977-04-01), Whitney et al.
patent: 4907340 (1990-03-01), Fang et al.

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