Spark plug for apparatus for detecting ion current without gener

Details Spark plug for apparatus for detecting ion current without gener Spark plug for apparatus for detecting ion current without gener

1997-08-28

2000-08-29

Day, Michael H.

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

313141, 313140, 313143, H01T 1320

Patent

active

06111345&

ABSTRACT:
In a spark plug having a generally cylindrically shaped metallic body, a generally cylindrically shaped insulator held in the metallic body, a center electrode held in the insulator, and a ground electrode facing the center electrode, the insulator has a ramp portion on an outside surface thereof and the metallic body has a supporting portion for supporting the ramp portion of the insulator. Further, a conductive layer (a protection layer) is formed on the surface of the insulator to face the supporting portion of the metallic body. Accordingly, a corona discharge in a clearance between the supporting portion of the metallic body and the insulator is prevented, so that spike-like noise can be prevented.

REFERENCES:
patent: 2499823 (1950-03-01), Gogel
patent: 5271268 (1993-12-01), Ikeuchi et al.
patent: 5406242 (1995-04-01), Klocinski et al.

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