Twin anode beam mode fluorescent lamp
US4518897A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 4, 1982 |
| Grant date | May 21, 1985 |
| Priority date | — |
| Expiry date | Jan 4, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/72
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The lamp shown herein is a beam mode fluorescent lamp for general lighting applications. The lamp comprises a light transmitting envelope, having a phosphor coating on its inner surface, enclosing a thermionic cathode for emitting electrons, a pair of anodes for accelerating the electrons and forming electron beams, and a fill material, such as mercury, which emits ultraviolet radiation upon excitation. The two anode configuration provides an extended region of electron beam excitation. In addition, a separate cathode heater filament is not required due to the anode configuration. As a result this lamp is operated with a single power source and only two conductors connecting the power source to the electrodes. This invention further provides a high degree of self-stabilization of discharge current by means of the twin parallel anode configuration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.