Positive temperature coefficient heater and production method thereof

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(11)

EP 0 991 300 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	16.01.2002 Bulletin 2002/03

(43)	Date of publication A2:
	05.04.2000 Bulletin 2000/14

(21)	Application number: 99305382.6

(22)	Date of filing: 07.07.1999

(51)	International Patent Classification (IPC)⁷: H05B 3/26, H05B 3/28, H05B 3/84, H05B 3/00, C23F 1/20

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

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Priority:

01.10.1998 KR 9841477

(71)	Applicant: Daeil P.F.T. Co., Ltd.
	Shihung-Shi, Kyongki-Do (KR)

(72)	Inventor:
	Kim, Gyongtae Kangnam-Ku, Seoul (KR)

(74)	Representative: Hill, Richard et al
	Wilson, Gunn, M'Caw, Cross Street 41-51 Royal Exchange Manchester M2 7BD Manchester M2 7BD (GB)

(54)	Positive temperature coefficient heater and production method thereof

(57) A positive temperature coefficient heater produced by protecting the form of a definite pattern on an insulator having an aluminum thin film using an etching resist, after etching the portions unprotected with the above-described etching resist using an etching agent, removing the etching resist and the etching agent, and further printing a definite form using a carbon paste to connect electrode terminals to aluminum electrode layer in parallel.
In the positive temperature coefficient heater of the present invention, as compared with using a conventional silver paste, there is almost no deviation of temperature, the production cost is greatly reduced, and further the production step is simplified, whereby when the positive temperature coefficient heater is attached to the inside of a side mirror of a motorcar, an excellent effect is shown in the removal of fogging, ice, etc.

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