Multiple-tube compact low-pressure discharge fluorescent lamp
US4853591A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 1987 |
| Grant date | Aug 1, 1989 |
| Priority date | — |
| Expiry date | Dec 29, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/545
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
At least two discharge units (2, 3; 14, 15, 16; 21, 22, 23, 27, 28, 29) are ocated adjacent each other, each of the discharge units preferably including a unitary U-shaped tube having two longitudinal leg portions (2a, 2b; 3a, 3b) extending parallel to each other, and a cross portion (4, 5) connecting the leg portions at the base of the U. The free ends of the U are pinch-sealed and air-tight, and the two discharge units are so positioned relative to each other that the longitudinal leg portions extend parallel to each other, selectively, in a single plane, in parallel planes, or angled with respect to each other; the cross elements are located at adjacent end portions of the respective units. One filament-carrying electrode is sealed into one free end of one leg of one U-shaped tube of one unit, and another filament-carrying electrode is sealed into a free end of one leg of another unit; the units are cross-connected to provide a continuous discharge path, the cross connection being effected adjacent pinch-sealed ends of those legs of the U-shaped tubes which do not have filament-carrying electrodes sealed therein. To facilitate lamp starting, an auxiliary electrode (116) is pinch…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.