ATBECHDEDKESFRGBGRITLILUNLSEMCPTIESILTLVFIRO....ALRDIM360 - Ver 2.9 (30 Jun 1998) 1620000/00834699EUROPEAN PATENT APPLICATIONA320000607EP97117142.619971002EnEnEn2647219619961004JP20000607200023199804081998157 7F 23Q 7/00 AdeGlühkerzeenGlow plugfrBougie à incandescence1DENSO CORPORATION00211498ND10101-1, Showa-choKariya-City Aichi-Pref. 448JPKoyama, Taijic/o DENSO CORPORATION, 1-1 Showa-choKariya-city, Aichi-Pref. 448JPIshii, Hirohisa c/o Denso CorporationIntellectual Property Department 1-1 Showa-choKariya-city, Aichi-Pref. 448JPKuhnen & Wacker00101501Patentanwaltsgesellschaft mbH, Alois-Steinecker-Strasse 2285354 FreisingDEATBECHDEDKESFIFRGBGRIEITLILUMCNLPTSEALLTLVROSI20000607200023

A heater tube (3) comprises a smaller-diameter portion (31) and a larger-diameter portion (32). A first resistor (4) and a second resistor (5) are provided in the heater tube (3). The second resistor (5) has a positive resistance-temperature coefficient larger than that of the first resistor (4). The first resistor (4) and the second resistor (5) are electrically connected in series. The entire body of the first resistor (4) and 3/4 of the second resistor (5) are accommodated in the smaller-diameter portion (31).