Tubular fluorescent lamp with intermediate electrode
US5138223A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 15, 1990 |
| Grant date | Aug 11, 1992 |
| Priority date | — |
| Expiry date | Jun 15, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/92
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a fluorescent lamp, a curved discharge path is constituted by a plurality of bulbs and a cap interconnecting end portions of the bulbs. Terminal electrodes are provided at end portions of the bulbs, which are situated at both ends of the discharge path. An intermediate electrode is arranged within the cap. A voltage is applied selectively between the intermediate electrode and the terminal electrodes, thereby selectively enabling the bulbs to emit light. The bulbs may have apertures having different widths and positions. Different types of phosphor layers may be formed on the inner surfaces of the bulbs, thereby selectively emitting light of different wavelengths.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.