| 摘要 |
A xenon discharge type planar fluorescent lamp for liquid crystal backlight has a transparent conductive film that is formed on the glass substrate of light emitting surface and heated by a current at the time of lighting to have adverse effect on the liquid crystal; therefore that heat must be shut off in front of the lamp. A plurality of rows of dot-line V-grooves (11, 21, 31) are formed, respectively, in a front glass substrate (1), an intermediate glass substrate (2) and a rear glass substrate (3) as spacer means, a phosphor coating (22), a transparent conductive film (23) and an auxiliary conductive film (24) are formed on the intermediate glass substrate (2), and a phosphor coating (32) and a translucent conductive film (33) are formed on the rear glass substrate (3). Subsequently, the three glass substrates are stacked in three stages and the outer circumferential part thereof is welded through frit glass (7) while sandwiching exhaust pipes (4, 5) and a glass frame plate (6), thus forming a sealed two-layer lamp. Heat generated from the transparent conductive film (23) can be shut off by a vacuum heat insulation layer (42) by realizing a xenon discharge type planar fluorescent lamp having a structure employing a front layer as the vacuum heat insulation layer (42) and a rear layer as a rare gas layer (52) encapsulating xenon gas.
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