Arc tube for a discharge lamp

Details Arc tube for a discharge lamp Arc tube for a discharge lamp

2007-10-09

2007-10-09

Williams, Joseph (Department: 2879)

Electric lamp and discharge devices

With gas or vapor

With particular gas or vapor

C313S641000, C313S639000, C313S637000

Reexamination Certificate

active

11010293

ABSTRACT:
An arc tube for a discharge lamp has a closed chamber filled with rare gas and a metal halide containing at least Na halide or Sc halide, and electrodes, wherein sealing pressure of the rare gas is 0.6 MPa or more, and a sealing density of the Sc halide in the closed chamber is ranging from 1.25 to 4.70 mg/ml. In the arc tube, since the Xe gas sealing pressure slightly higher than 0.6 MPa, the pressure in the closed chamber is increased during its lightening state. Thus, reactions leading to a flicker occurrence may be accelerated. However, the flicker occurrence can be suppressed by setting the Sc halide sealing density to 4.70 mg/ml or less. Further, a luminous efficiency required for the lamp can be assured by setting the Sc halide sealing density to 1.25 mg/ml or more.

REFERENCES:
patent: 6265827 (2001-07-01), Takahashi et al.
patent: 6271628 (2001-08-01), Sugitani et al.
patent: 2003/0189408 (2003-10-01), Lapatovich et al.
patent: 2004/0113557 (2004-06-01), Scott et al.
patent: 2005/0093455 (2005-05-01), Tamura et al.
patent: 2002-93369 (2002-03-01), None

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