Dual arc tube discharge lamp having a lamp frame with coplanar spot welds and slip-free construction
US5408157A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 9, 1993 |
| Grant date | Apr 18, 1995 |
| Priority date | — |
| Expiry date | Mar 9, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/34
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A high pressure discharge lamp includes a pair of arc tubes connected electrically in parallel within an outer envelope, which includes a lamp stem having a pair of stem conductors entering the lamp envelope in a common plane. The arc tubes include conductive feed-throughs at each end thereof. A lamp frame supports the arc tubes in a plane parallel with the stem conductors and is welded directly to each of the feed-throughs with all welds in a common plane with the welds between the frame and the stem conductors. The frame includes a resiliently deformable transverse member which allows for independent changes in length of the arc tubes during lamp operation due to thermal expansion/contraction. The frame is free of slip fit connections with the feed-throughs and free of additional conductive straps connected to the feed-throughs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.