| US 7,560,865 B2 | ||
| Discharge lamp of the short arc type | ||
| Masaki Katou, Himeji (Japan); and Motohiro Sakai, Himeji (Japan) | ||
| Assigned to Ushiodenki Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Dec. 11, 2003, as Appl. No. 10/732,254. | ||
| Claims priority of application No. 2002-367338 (JP), filed on Dec. 18, 2002. | ||
| Prior Publication US 2004/0119412 A1, Jun. 24, 2004 | ||
| Int. Cl. H01J 61/36 (2006.01); H01J 1/62 (2006.01) | ||
| U.S. Cl. 313—625 [313/234; 313/623; 313/602] | 8 Claims |
| 1. Discharge lamp of the short arc type which comprises:
an arc tube,
hermetically sealed tubes, each of which is located at a respective one of opposite ends of the arc tube,
a pair of electrodes which are located in the arc tube,
electrode rods which support the electrodes,
support parts, each of which is formed by part of one of the hermetically sealed tubes,
cylindrical retaining bodies, each of which is located completely within in intimate contact with a respective one of the
support parts along the full length thereof and in which a respective one of the electrode rods is held securely, and wherein
the cylindrical retaining bodies are formed from a material having silica glass as the main component and containing a metal
or a metallic compound in a manner which functions as a means for increasing the dielectric constant to decrease the breakdown
voltage, and
a trigger component which is located on an outer side surface of the support parts, wherein the trigger component includes
a trigger wire wound around the support parts,
wherein a gap is located between the cylindrical retaining bodies and the electrode rod forming a capacitor with the retaining
bodies and electrode at least in an area in which the trigger wire is wound.
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