Electrodeless low-pressure discharge lamp with plasma channel
US5327049A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 30, 1992 |
| Grant date | Jul 5, 1994 |
| Priority date | — |
| Expiry date | Dec 30, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J65/048
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electrodeless low pressure discharge lamp, preferably filled with deuterium gas, is provided with a cylindrical envelope made from quartz glass and surrounded by a cylindrical excitation coil driven at between 10 and 800 MHz. Within the lamp envelope, there is provided a cylindrical aperture member made from boron nitride which in a radial direction extends to the inner surface of the envelope and which is provided with an uninterrupted coaxial channel for confining to a small diameter the plasma discharge arc generated during operation of the lamp, the aperture member having an optical axis extending through coaxially with its channel, the radiation emitting in a directed pattern along the optical axis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.