| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem of contracting electric discharge, causing uneven brightness etc., under various operational conditions of a lamp with a conventional plane light source. SOLUTION: It is possible to accomplish the purpose by making a mixing ration of xenon in mixed gas of xenon, argon and neon not less than 5% and not more than 15%, a mixing ratio of argon not less than 35% and not more than 65% and a mixing ratio of neon not less than 20% and not more than 50% on the plane light source constituted by constituting a closed container having an electric discharge space the cross-section of which is flat by positioning a front surface plate and a back surface plate having translucence roughly in parallel with each other, providing a pair of electric discharge electrodes on an inner surface of the front surface plate, providing a dielectric layer by covering a surface of the electric discharge electrodes, applying a fluorescent substance on an inner surface of the closed container and sealing the mixed gas of xenon, argon and neon inside.
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