Magnetically transparent electrostatic shield
AssigneeOsram Sylvania Inc.
InventorRobert B. Piejak
Life of this patent
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Abstract
An inductively-coupled, electrodeless fluorescent lamp comprises a lamp body having two opposed sides; an induction coil on one side of said body; and a magnetically transparent electrostatic shield interposed between said induction coil and said one side of said body, said shield comprising an insulating substrate; an electrically conductive layer on said substrate including means for reducing capacitive coupling between a voltage on said induction coil and a plasma discharge within said lamp body, said electrically conductive layer having a thickness between 400 Å and 1000 Å, inclusive.
Claims5
An inductively-coupled, electrodeless fluorescent lamp comprising;
- a lamp body having two opposed sides;
- an induction coil on one side of said body;
- and a magnetically transparent electrostatic shield interposed between said induction coil and said one side of said body, said shield comprising an insulating substrate;
- an electrically conductive layer on said substrate including means for reducing capacitive coupling between a voltage on said induction coil and a plasma discharge within said lamp body, said electrically conductive layer having a thickness between 400 Å and 1000 Å, inclusive.
A magnetically transparent electrostatic shield comprising:
- an insulating substrate;
- an electrically conductive layer on said substrate including means for reducing capacitive coupling between a voltage on an induction coil and a plasma discharge, said electrically conductive layer having a thickness between 400 and 1000 Å.
A method of increasing the efficiency of an inductively-coupled, electrodeless fluorescent lamp comprising the steps of;
- providing a lamp body having two opposed sides;
- positioning an induction coil on one side of said body;
- and positioning a magnetically transparent electrostatic shield between said induction coil and said one side of said body, said shield comprising an insulating substrate;
- an electrically conductive layer on said substrate including means for reducing radio frequency capacitive coupling between a voltage on said induction coil and a plasma discharge within said lamp body, said electrically conductive layer having a thickness between 400 Å and 1000 Å, inclusive;
- and inducing an operating voltage on said lamp through said induction coil.
Dependencies are inferred from the claim text.