| US 7,550,924 B2 | ||
| High-pressure discharge lamp having a metal exhaust tube | ||
| Leo Gustaaf Joanna Emiel Marien, Eindhoven Turnhout (Belgium); Willibrordus Hubertus Martinus Maria Van De Spijker, Eindhoven (Netherlands); Nancy Jean Caruso, Turnhout (Belgium); and Jean-François Lavaud, Bergerac (France) | ||
| Assigned to Koninklijke Philips Electronics N.V., Eindhoven (Netherlands) | ||
| Appl. No. 10/546,317 PCT Filed Feb. 24, 2004, PCT No. PCT/IB2004/050140 § 371(c)(1), (2), (4) Date Aug. 19, 2005, PCT Pub. No. WO2004/077490, PCT Pub. Date Sep. 10, 2004. |
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| Claims priority of application No. 03290472 (EP), filed on Feb. 27, 2003. | ||
| Prior Publication US 2006/0076869 A1, Apr. 13, 2006 | ||
| Int. Cl. H01J 17/16 (2006.01); H01J 19/42 (2006.01); H01J 17/00 (2006.01) | ||
| U.S. Cl. 313—634 [313/317; 313/318.01; 313/318.12; 313/324; 313/567] | 17 Claims |
| 1. A high-pressure discharge lamp comprising:
an outer envelope in which a discharge vessel is arranged around a longitudinal axis,
the discharge vessel enclosing, in a gas-tight manner, a discharge space provided with an ionizable filling,
the discharge vessel having a first and a second mutually opposed neck-shaped portion through which a first and a second current
supply conductor, respectively, extend to a pair of electrodes arranged in the discharge space,
a lamp base of electrically insulating material supporting the discharge vessel by means of the first and second current supply
conductors,
the lamp base also supporting the outer envelope,
the outer envelope enclosing the first and second current supply conductors, and
the outer envelope being connected to the lamp base in a gas-tight manner, an exhaust tube for evacuating the outer envelope
provided in the lamp base or in the outer envelope,
wherein the exhaust tube in the lamp base is made from a NiFeCr alloy,
wherein the ratio of the distance de between the electrodes to the height hdl of the high-pressure discharge lamp along the longitudinal axis complies with:
0.02<de/hdl<0.2.
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