Electrodeless low-pressure discharge
AssigneeU.S. Philips Corporation
InventorsHendrik J. Eggink, Winand H. A. M. Friederichs, Nicasius C. T. Van Gennie
Life of this patent
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Abstract
The electrodeless low-pressure discharge lamp has a lamp vessel (1) having a cavity (2) at an end portion (3) thereof. An electric coil (4) surrounding a plastic sleeve (5), wherein a liquid-filled tubular container (7) surrounded by a soft-magnetic core (6) is present, is accommodated in the cavity (2). The plastic sleeve (5) is substantially filled up with an elastic polymer. Additionally, the tube (5) may be enveloped by an elastic polymer (9). The elastic polymer ensures a relatively low operating temperature of the members inside the cavity (4).
Claims14
An electrodeless low-pressure discharge lamp comprising
- a lamp vessel which is sealed in a vacuum-tight manner, contains ionizable metal vapor and rare gas, and has a cavity at an end portion of said vessel,
- a sleeve of synthetic material within the cavity of the lamp vessel,
- a core of soft magnetic material within the sleeve,
- an electric coil around the sleeve,
- a tube containing a liquid in the core of soft magnetic material, which tube projects to, and has a flange, outside the cavity characterized in that:
- the sleeve is at least substantially filled with an elastic polymer.
An electrodeless low-pressure discharge lamp, comprising:
- a) sealed lamp vessel containing an ionizable metal vapor and a rare gas, said lamp vessel having a wall extending into the lamp vessel and defining a cavity in said lamp vessel;
- and
- b) a sub-assembly insertable into said cavity and comprising a sleeve, an electric coil having turns coiled about said sleeve, a core of magnetic material within said sleeve, a cooling means extending from said core for transferring heat from said core to the exterior of said cavity, said cooling means having a gap with said core, and an elastic polymer substantially filling said gap between said core and said cooling means for facilitating heat transfer between said core and said cooling means.
An electrodeless low-pressure discharge lamp, comprising:
- a) sealed lamp vessel containing an ionizable metal vapor and a rare gas, said lamp vessel having a wall extending into the lamp vessel and defining a cavity in said lamp vessel;
- b) a mass of polymer substantially filling a portion of said cavity;
- and
- c) a sleeve, an electric coil coiled about said sleeve, a core of magnetic material within said sleeve, and a cooling means for transferring heat from said core to the exterior of said cavity, said cooling means extending from within said core of magnetic material to the exterior of said cavity such that said sleeve, said core, said coil, and a portion of said cooling means within said core are enveloped by said mass of polymer.
Dependencies are inferred from the claim text.