Electrodeless low-pressure discharge lamp with plasma channel
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United States of America Patent
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Jul 5, 1994
Issued Date -
N/A
app pub date -
Dec 30, 1992
filing date -
Jun 24, 1991
priority date (Note) -
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Abstract
An electrodeless low pressure discharge lamp, preferably filled with deuterium gas, is provided with a cylindrical envelope made from quartz glass and surrounded by a cylindrical excitation coil driven at between 10 and 800 MHz. Within the lamp envelope, there is provided a cylindrical aperture member made from boron nitride which in a radial direction extends to the inner surface of the envelope and which is provided with an uninterrupted coaxial channel for confining to a small diameter the plasma discharge arc generated during operation of the lamp, the aperture member having an optical axis extending through coaxially with its channel, the radiation emitting in a directed pattern along the optical axis.
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