公开(公告)号：US10985535B2

公开(公告)日：2021-04-20

申请号：US16936778

申请日：2020-07-23

Applicant: DENSO CORPORATION

Inventor： Hiroshi Araki ,  Naoto Hayashi ,  Hikaru Takashima

IPC: H01T13/34 ,  H01T13/32 ,  H01T13/41 ,  H01T21/02 ,  H01T13/20

Abstract: In a method for manufacturing a spark plug, a space on a proximal end side of a center electrode in a shaft hole of an insulator is filled with first electrically conductive glass powder. A space on the proximal end side of the first electrically conductive glass powder in the shaft hole is filled with resistor composition powder. A space on the proximal end side of the resistor composition powder in the shaft hole is filled with second electrically conductive glass powder. The first electrically conductive glass powder, the resistor composition powder, and the second electrically conductive glass powder are sintered in the shaft hole. Prior to filling of the resistor composition powder, at least one of the insulator and the first electrically conductive glass powder is placed in an uncharged state, or the insulator and the first electrically conductive glass powder are placed in the same charged state.