Arc tube for discharge lamp and method for producing the same

Details Arc tube for discharge lamp and method for producing the same Arc tube for discharge lamp and method for producing the same

2005-07-19

2005-07-19

Williams, Joseph (Department: 2879)

Electric lamp or space discharge component or device manufacturi

Process

With assembly or disassembly

C445S043000

Reexamination Certificate

active

06918808

ABSTRACT:
A discharge lamp arc tube in which a pair of electrode assemblies each having an electrode rod, a sheet of molybdenum foil and a lead wire integrally series-connected to one another have respective molybdenum foil containing regions pinch-sealed with glass, and electrodes are disposed opposite to each other in a closed glass bulb containing a light emitting substance or the like enclosed therein. The surface of the sheet of molybdenum foil sealed at each of the pinch seal portions has a micro-asperity surface roughened by an etching treatment including oxidation and reduction, so that silica glass is closely packed in the micro-asperity of the surface of the sheet of molybdenum foil. As a result, the adhesion (mechanical bonding strength) in the interface between silica glass and molybdenum foil is improved so that foil rising is suppressed and, accordingly, the lifetime of the arc tube is extended.

REFERENCES:
patent: 3582704 (1971-06-01), Fridrich
patent: 3693241 (1972-09-01), Fridrich
patent: 4587454 (1986-05-01), Bonazoli et al.
patent: 5286227 (1994-02-01), Numajiri et al.
patent: 5980977 (1999-11-01), Deng et al.
patent: 6354900 (2002-03-01), Ohshima et al.
patent: 2003/0234612 (2003-12-01), Kelly et al.

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