Electrode-less gas discharge lamp

Abstract

The invention relates to an electrode-less gas discharge lamp, which comprises the following parts: a vacuum sealed bulb (1) provided with a cavity (2), which is filled with ionizable metallic vapor and rare gas; a heat transfer element (3), which is positioned in the cavity partly at least; magnets (4) fixed on the heat transfer element; and a coil (5) which is wrapped around a central cylinder formed by the magnets and the heat transfer element. The electrode-less gas discharge lamp is characterized in that the magnets are cylindrical magnets of which the cross section is fan-shaped and the number of the magnets is at least two, the heat transfer element is a metal cylindrical body and at least one section of the cylindrical body in the metal cylindrical body is provided with a plurality of lateral surfaces with planar shapes, and each magnet is fixed on the lateral surfaces with planar shapes of the metal cylindrical body. The electrode-less gas discharge lamp has a simple structure, and the temperature of the magnets is low.

Description

technical field [0001] The invention relates to a gas discharge lamp, in particular to an electrodeless gas discharge lamp. Background technique [0002] This gas discharge lamp is known from the Chinese patent No. 92100448.6 issued on May 24, 1995 (No. CN1028581C). The gas discharge lamp includes: a bulb sealed in a vacuum-tight form, the bulb is filled with ionizable metal vapor and rare gas, and there is a cavity at one end of the bulb; the coil is wound around the bulb Cavity on a sleeve made of synthetic material; magnet made of soft magnetic material housed in a sleeve made of synthetic material; small tube filled with liquid housed in a magnet made of soft magnetic material , extending out of the cavity and having a flange outside the cavity; the sleeve is at least substantially filled with an elastic polymer. [0003] The lamp of this patent uses a small tube filled with liquid for cooling to eliminate the danger of super high temperature of the magnet made of soft...

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Problems solved by technology

[0003] The lamp of this patent uses a small tube filled with liquid for cooling to eliminate the danger of super high temperature of the magnet made of soft magnetic material. One of the disadvantages is that the small tube filled with liquid is an expensive component; A sleeve made of synthetic material is at least substantially filled with an elastic polymer in order to solve the problem that the magnet and the small tube cannot come into close contact with each other due to their different coefficients of thermal expansion or due to tolerances in the dimensions of these elements And the problem of affecting heat transfer, and the fact that elastic polymers themselves have poor heat transfer capabilities, so the patent still has the risk that its magnets will have a higher temperature

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