(19)
(11) EP 0 407 837 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
07.08.1991 Bulletin 1991/32

(43) Date of publication A2:
16.01.1991 Bulletin 1991/03

(21) Application number: 90112498.2

(22) Date of filing: 29.06.1990
(51) International Patent Classification (IPC)5: H01J 61/90, H01J 17/40
(84) Designated Contracting States:
DE GB

(30) Priority: 14.07.1989 JP 82242/89 U

(71) Applicant: YAZAKI CORPORATION
Minato-ku Tokyo 108 (JP)

(72) Inventors:
  • Yagi, Kiyoshi, c/o Yazaki Parts Co., Ltd.
    Gotenba-shi, Shizuoka 412 (JP)
  • Wakabayshi, Seiichi, c/o Yazaki Parts Co., Ltd.
    Gotenba-shi, Shizuoka 412 (JP)

(74) Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser Anwaltssozietät 
Maximilianstrasse 58
80538 München
80538 München (DE)


(56) References cited: : 
   
       


    (54) Gas-filled discharge tube


    (57) A gas-filled discharge tube (2) of a compact construction for use as a series gap in the ignition system of an automotive spark-ignition engine and the like. The gas-filled discharge tube (7) comprises an insulating tube unit (7) having a tube (11) provided with openings (10,12) of a diameter smaller than the inside diameter thereof in the opposite ends thereof, a pair of electrode bases (9) closely attached to the opposite ends of the tube (11) so as to seal the openings, a pair of perforated discharge electrodes (8) attached respectively to the opposite inner surfaces of the electrode bases (9) to form a series gap, and an inert gas filling the tube. Since the diameter of the electrode bases (9) sealing the comparatively small openings (10,12) is comparatively small, the electrode bases (9) of a comparatively small diameter may be used. Thus, the capacitance between the electrode bases, hence the capacitance of the gas-filled discharge tube, is comparatively small, which enables the firing potential of the gas-filled discharge tube to be increased without increasing the capacitance of the same.







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