(19)
(11) EP 3 001 519 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
published in accordance with Art. 153(4) EPC

(15) Correction information:
Corrected version no 1 (W1 A1)

(48) Corrigendum issued on:
10.08.2016 Bulletin 2016/32

(43) Date of publication:
30.03.2016 Bulletin 2016/13

(21) Application number: 14801406.1

(22) Date of filing: 21.05.2014
(51) International Patent Classification (IPC): 
H01T 13/20(2006.01)
(86) International application number:
PCT/JP2014/063507
(87) International publication number:
WO 2014/189088 (27.11.2014 Gazette 2014/48)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME

(30) Priority: 21.05.2013 JP 2013106942

(71) Applicants:
  • DENSO CORPORATION
    Kariya-city, Aichi-pref. 448-8661 (JP)
  • Tanaka Kikinzoku Kogyo K.K.
    Chiyoda-ku Tokyo 100-6422 (JP)

(72) Inventors:
  • MURAYAMA, Yuki
    Kariya-city Aichi 448-8661 (JP)
  • ABE, Nobuo
    Kariya-city Aichi 448-8661 (JP)
  • SAKAIRI, Koichi
    Hiratsuka-shi Kanagawa 254-0076 (JP)
  • TANAKA, Kunihiro
    Hiratsuka-shi Kanagawa 254-0076 (JP)

(74) Representative: Kuhnen & Wacker 
Patent- und Rechtsanwaltsbüro Prinz-Ludwig-Straße 40A
85354 Freising
85354 Freising (DE)

   


(54) METHOD FOR MANUFACTURING SPARK PLUG FOR INTERNAL COMBUSTION ENGINE


(57) A method of manufacturing a spark plug 1 in which at least one of a center electrode 2 and a ground electrode 3 includes a discharge chip 5. In a chip making step, the discharge chip 5 is made by joining a discharge part 51 arranged on a spark discharge gap 11 side and a base member-joining part 52 that is made of a material having a lower melting point than the discharge part 51 and to be joined to an electrode base member 30. In a temporary joining step, the discharge chip 5 is temporarily joined, at the base member-joining part 52, to the electrode base member 30 by resistance welding. In a main joining step, the discharge chip 5 is joined, by laser welding, to the electrode base member 30 so that a side surface 511 of the discharge part 51 and a surface 31 of the electrode base member 30 are smoothly connected by a connecting surface 523 that has no sharp edge.