Electric lamp and discharge devices – With gas or vapor – Envelope with particular structure
Reexamination Certificate
2005-06-07
2005-06-07
Williams, Joseph (Department: 2879)
Electric lamp and discharge devices
With gas or vapor
Envelope with particular structure
C313S623000, C313S636000, C313S573000
Reexamination Certificate
active
06903510
ABSTRACT:
An arc tube body20and a foil such as molybdenum foil30are joined with each other such that a compressive stress of 105N/m2or more remains at an ordinary temperature in the arc tube body20along a junction surface. The compressive stress is always generated on the arc tube body20even if a fluctuation in the stress is caused on the junction surface by the repetition of the ON/OFF of the arc tube (or a tensile stress is caused to have a very small value even if the compressive stress and the tensile stress are alternately generated). Thus, the junction strength of both members may be increased. In one embodiment, a plurality of cracks (intercrystalline cracks) may be generated on the molybdenum foil30by a high pressure acting during pinch seal, and quartz glass is caused to enter the cracks so that the junction strength of both members can be increased.
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Goto Hiroshi
Irisawa Shinichi
Nagata Akihiro
Ohshima Yoshitaka
Koito Manufacturing Co. Ltd.
Quarterman Kevin
Williams Joseph
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