Arc tube having electrodes including coil winding portions...

Optics: image projectors – Lamp control

Reexamination Certificate

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Details

C353S099000, C353S122000, C313S613000, C313S574000, C313S628000

Reexamination Certificate

active

07967449

ABSTRACT:
An arc tube includes: a tube spherical portion containing a pair of electrodes each of which has a shaft portion and a coil winding portion formed by winding coil around the shaft portion; and a pair of seal portions extending from both sides of the tube spherical portion. The coil winding portion of at least one of the electrodes has a coil portion formed by winding the coil at least once around the shaft portion in the longitudinal direction of the shaft portion, a tip disposed on the tip side of the coil portion, and a base disposed on the base side of the coil portion. The coil of the base positioned on the surface side of the electrode is melt-treated. The coil forming the base is not melted to be combined with the shaft portion.

REFERENCES:
patent: 2004/0245930 (2004-12-01), Tukamoto et al.
patent: 2006/0055329 (2006-03-01), Yamashita et al.
patent: 08-273599 (1996-10-01), None
patent: 2005-005183 (2005-01-01), None
patent: 2006-079986 (2006-03-01), None

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