| 摘要 |
The thickness of a luminophor film (16') provided on the inner surface of a translucent discharge vessel (11) having a cavity portion (12) in which a light emitting substance is enclosed is the maximum in the vicinity of a plasma (15), becomes smaller as being closer to a connection portion (21) with an inner tube (32) and becomes also smaller as being closer to a round bottom portion (41). With this film thickness distribution, an electrodeless fluorescent lamp having approximately the same luminous intensity distribution characteristics as those of an incandescent lamp can be achieved. Therefore, even when the electrodeless fluorescent lamp is connected to an incandescent lamp lighting fixture, light can be taken out in a preferable state.
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