Igniter plug

Electric lamp and discharge devices: systems – Combined load device or load device temperature modifying... – Discharge device load

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Details

313131A, 313131R, 313141, 313144, H01J 732, H01J 1320

Patent

active

051031361

ABSTRACT:
An igniter plug has a metallic shell, a front end of which has a tubular ground electrode. A hollow semiconductor tip is in the form of inversed frusto-cone shape, and placed within the tubular ground electrode. A tubular insulator is placed within the metallic shell to be in alignment with the semiconductor tip. A center electrode is placed within the insulator, a front end of the center electrode passing through the semiconductor tip to provide an annular discharge gap between the front end of the center electrode and that of the ground electrode. A low resistor layer provided on a front end surface of the semiconductor tip. An electrical resistance of the layer is determined to be smaller than that of the semiconductor tip, while a thickness of the layer is such that the layer precedes the semiconductor tip in forming a discharge path between the front end of the center electrode and that of the ground electrode only during a predetermined period after the igniter plug is initially operated.

REFERENCES:
patent: 4419601 (1983-12-01), Hamai et al.
patent: 4795937 (1989-01-01), Wagner et al.
patent: 4814664 (1989-03-01), Rothenbuhler
patent: 4873466 (1989-10-01), Matsumura et al.
patent: 4951173 (1990-08-01), Suzuki et al.
patent: 4963784 (1990-10-01), Niessner
patent: 4973877 (1990-11-01), Suzuki et al.

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