Electrodeless gas discharge lamp assembly with flux concentrator
US6380680B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 2, 1998 |
| Grant date | Apr 30, 2002 |
| Priority date | — |
| Expiry date | Oct 2, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J65/048
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An inductively driven gas discharge lamp assembly (20,40) which includes an electrodeless lamp (12,12′), an inductive drive coil (14), and a flux concentrator (22,42) disposed about the drive coil. The drive coil (14) is wound about the lamp (12,12′), which has a neon or other ionizable gas fill that provides a visible plasma discharge upon energization by the drive coil. The flux concentrator (22,42) can comprise a sleeve (24,44) of magnetically permeable material, such as ferrite, which confines the magnetic field generated by the drive coil (14). The flux concentrator (42) can include an end piece (46) that further confines the magnetic field at one end of the drive coil and c include a core piece (48) that extends into a central recess (50) within the lamp (12′) to concentrate the magnetic flux at a particular region within the lamp where the plasma discharge is primarily located. Also disclosed is an automotive lamp assembly (60) that incorporates the flux concentrator (22) along with an d.c. to a.c. inverter circuit (64), an r.f. shield (80), and a heat sink (106).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.