Dielectric-loaded field applicator for EHID lamps and EHID lamp assembly containing same
AssigneeOsram Sylvania Inc.
InventorWalter P. Lapatovich
Life of this patent
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Abstract
A dielectric-loaded field applicator and an EHID lamp assembly are provided wherein the applicator comprises a helical resonator having a cylindrical dielectric core and a helical conductor, the dielectric core having a helical groove extending along its surface substantially from end to end; the helical conductor being contained in the helical groove and connectable at one end to a power source, the dielectric core being comprised of a dielectric material having a relative permittivity greater than about 3, preferably polycrystalline alumina. The EHID lamp assembly includes two opposed dielectric-loaded applicators with a discharge vessel supported between them.
Claims20
A dielectric-loaded field applicator for an EHID lamp, comprising:
- a helical resonator having a cylindrical dielectric core and a helical conductor, the dielectric core having a helical groove extending along its surface substantially from end to end;
- the helical conductor being contained in the helical groove and connectable at one end to a power source, the dielectric core having a recess for holding a discharge vessel and being comprised of a dielectric material having a relative permittivity greater than about 3.
An EHID lamp assembly, comprising:
- two opposed dielectric-loaded field applicators and a discharge vessel disposed between the applicators;
- the discharge vessel containing a discharge medium and being supported at opposite ends by the applicators;
- the applicators each comprising a helical resonator having a cylindrical dielectric core and a helical conductor, the dielectric core having a helical groove extending along its surface substantially from end to end, the helical conductor being contained in the helical groove and connectable at one end to a power source, the dielectric core being comprised of a dielectric material having a relative permittivity greater than about 3;
- and
- the discharge vessel and the two applicators being arranged along, and coaxial with, a common axis.
An EHID lamp assembly, comprising:
- two opposed dielectric-loaded field applicators and a discharge vessel disposed between the applicators;
- the discharge vessel containing a discharge medium and being supported at opposite ends by the applicators;
- the applicators each comprising a helical resonator having a cylindrical dielectric core and a helical conductor, the dielectric core having a helical groove extending along its surface substantially from end to end, the helical conductor being contained in the helical groove and connectable at one end to a power source, the dielectric core being comprised of polycrystalline alumina and having a recess for supporting the discharge vessel;
- the discharge vessel and the two applicators being arranged along, and coaxial with, a common axis, and each applicator having an EMI shield that is cylindrical in shape and substantially concentric with the helical resonator.
Dependencies are inferred from the claim text.