Circular fluorescent lamp
US5034655A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 24, 1989 |
| Grant date | Jul 23, 1991 |
| Priority date | — |
| Expiry date | Aug 24, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/322
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A fluorescent lamp has at least a pair of electrodes, at least two circular discharge tubes connected to said electrodes and enclosing rare gas and mercury therein, and a phosphor coating provided on an inside wall of each of said discharge tubes, the two circular discharge tubes being arranged coaxially circularly on one and the same plane, the diameter of each of the discharge tubes being selected to have a value within a range of from 5 mm to 25 mm both inclusive, the luminance on surface of each of the discharge tubes being selected to have a value within a range of from 2.times.10.sup.4 Cd/m.sup.2 to 6.times.10.sup.4 Cd/m.sup.2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.