(19)
(11) EP 0 834 699 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
07.06.2000 Bulletin 2000/23

(43) Date of publication A2:
08.04.1998 Bulletin 1998/15

(21) Application number: 97117142.6

(22) Date of filing: 02.10.1997
(51) International Patent Classification (IPC)7: F23Q 7/00
(84) Designated Contracting States:
AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV RO SI

(30) Priority: 04.10.1996 JP 26472196

(71) Applicant: DENSO CORPORATION
Kariya-City Aichi-Pref. 448 (JP)

(72) Inventors:
  • Koyama, Taiji
    Kariya-city, Aichi-Pref. 448 (JP)
  • Ishii, Hirohisa c/o Denso Corporation
    Kariya-city, Aichi-Pref. 448 (JP)

(74) Representative: Kuhnen & Wacker 
Patentanwaltsgesellschaft mbH, Alois-Steinecker-Strasse 22
85354 Freising
85354 Freising (DE)

   


(54) Glow plug


(57) 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).






Search report