Claims
- 1. A direct-current shore-arc discharge lamp comprising:
- a bulb (10) defining a longitudinal axis (2), and an anode (4) and a cathode (5) located in the bulb, facing each other, and aligned along said longitudinal axis;
- wherein the bulb is asymmetrical with respect to a plane (1) perpendicular to said longitudinal axis (2) and located at least approximately centrally of a longitudinal extent of an inner space of the bulb; and
- wherein said bulb (10) has an inner wall (3) which is wider in a region surrounding the anode (4) than in a region surrounding the cathode (5).
- 2. The lamp of claim 1, having a specific power rating greater than 80 W/mm with respect to a length of an arc (6) expressed in mm.
- 3. The lamp of claim 1, wherein, in longitudinal cross section, a relationship between a half-surface of the region surrounding the anode and a half-surface of the region surrounding the cathode is greater than 1.1.
- 4. The lamp of claim 3, wherein said relationship is less than 1.5.
- 5. The lamp of claim 1, wherein said bulb (10) is curved and a radius of curvature (8) of the bulb in the region surrounding the anode (4) is smaller than a radius of curvature (9) of the bulb in the region surrounding the cathode.
- 6. The lamp of claim 5, wherein the radius of curvature (8) of the bulb in the region surrounding the anode (4) is between 50% to 80% of the radius of curvature (9) of the bulb in the region surrounding the cathode (5).
- 7. The lamp of claim 1, wherein the bulb is devoid of a heat retaining coating and a heat damming coating.
- 8. The lamp of claim 1, wherein said lamp is arranged for operation with said longitudinal axis (2) in a horizontal position.
- 9. The lamp of claim 1, wherein said bulb retains a fill, and said fill comprises:
- an ignition gas;
- mercury;
- a halogen;
- and at least one of cadmium and zinc.
- 10. The lamp of claim 9, wherein the fill further includes yttrium.
- 11. The lamp of claim 9, wherein the fill further includes lithium.
- 12. The lamp of claim 9, wherein the fill further includes indium.
- 13. The lamp of claim 9, wherein the fill further includes a rare-earth metal.
- 14. The lamp of claim 13, wherein said rare-earth metal comprises dysprosium.
- 15. The lamp of claim 9, wherein the fill further includes thallium.
- 16. The lamp of claim 9, wherein the halogen comprises one of iodine and bromine.
- 17. The lamp of claim 1, further comprising an optical system (R) provided for receiving light from said lamp.
- 18. The lamp of claim 17, wherein said lamp is positioned, with respect to said optical system (R), such that the longitudinal axis (2) is located horizontally.
Priority Claims (1)
Number |
Date |
Country |
Kind |
197 14 008 |
Apr 1997 |
DEX |
|
Parent Case Info
Reference to related patents and applications, the disclosures of which are hereby incorporated by reference: U.S. Ser. No. 09/041,511, filed Mar. 12, 1998, GENZ et al. (claiming priority German Appln. 197 14 009.2 of Apr. 4, 1997) assigned to the assignee of the present application. U.S. Pat. No. 2,965,790, ITTIG et al. U.S. Pat. No. 4,686,419, BLOCK et al.
Reference to related patent disclosures: German 288,229, NERNST German 902,528, DOERING German 21 02 112, HELLMAN German 29 53 446 C2, KATSUO et al. German 30 44 184 A1, MUTZHAS German 32 08 647 A1, DOBRUSSKIN et al. German 25 10 145, WESSELINK et al.
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