Sealed thermostatic heater
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsMamoru Miyamoto, Kazuo Ishikawa
Life of this patent
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Abstract
A sealed thermostatic heater for use in a hair curling iron which uses a positive temperature coefficient (PTC) thermistor as a heat source together with a wire-wound heater, coated heater or ceramic heater.
Claims4
A sealed thermostatic heater comrpising a ceramic tube having at least one PTC thermistor and at least two metallic radiators housed therein, said PTC thermistor being held by and between said radiators, said ceramic tube being sealed in a metal tube, and PTC thermistor and a heater in said metal tube being electrically connected in series.
A sealed thermostatic heater comprising a ceramic tube having at least one PTC thermistor and at least two metallic radiators housed therein and a heater arranged at an outer periphery thereof, said PTC thermistor being held by and between said radiators, said ceramic tube being sealed in a metal tube, said PTC thermistor and said heater being electrically connected in series.
A sealed thermostatic heater comprising a ceramic tube having at least one series circuit housed therein, said series circuit including a disc type ceramic heater conductively held between a pair of metallic radiators and a disc type PTC thermistor conductively held between another pair of metallic radiators, said ceramic tube being inserted into a metal tube.
Dependencies are inferred from the claim text.