| 摘要 |
PURPOSE:To make it easy to get a high output, by forming an airtight container of a highly heatproof material, and covering the container by a light-transmitting material allowing no ultraviolet ray transmission. CONSTITUTION:In an airtight space 22, a discharge is taken place by a high frequency wave electromagnetic field generated by an induction coil 25. Since an airtight space 21 is well permeable for a visible light and ultraviolet rays, the beams of the both wavelength areas are radiated from a luminous bulb 24. When the both beams reach to the outside container 27, the ultraviolet rays are cut off and only the visible light permeates to output to the outside. In this case, since the luminous bulb 24 is formed of a highly heatproof material, the high output light can be radiated outward easily.
|
