| 摘要 |
PURPOSE:To equalize the discharge within every corner of the tube and suppress uneven emission of light by arranging the radiating direction of microwave to the same direction within the microwave propagation chamber and causing the light to be incident on the electrodeless luminous tube under the condition that distribution of light intensity is equalized. CONSTITUTION:The microwave from a microwave output part 13 of a magne tron 12 is sent to an antenna 18 and this microwave is radially emitted to a microwave propagation chamber 22 of a quartz glass bulb 20 from the antenna 18. The external circumference of a bulb 20 including this propagation chamber 22 is covered with a cylinder 25 made of stainless and the microwave is supplied to an electrodeless luminous tube 23 along the vertical direction of antenna 18. This propagation chamber 22 is kept under the vacuum condition and a dielectric loss of propagation chamber 22 is set smaller than that in the luminous tube 23. direction of microwave is arranged uniformly within the propagation chamber 22, distribution of intensity is equalized, the light is made incident on the luminous tube 23 passing through a flat separation plate 21 and thereby uneven emission of light within the luminous tube 23 is suppressed. |
