| 摘要 |
356,407. Discharge lamps. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN, 13D, Emmasingel, Eindhoven, Holland. July 29, 1930, No. 22820. Convention date, Sept. 27, 1929. [Class 39 (i).] In an electric discharge tube for the emission of rays, more particularly ultra-violet rays, and containing a substance whose vapour takes part in the discharge, a material capable of adsorbing that substance and of liberating it again when heated is provided inside the tube on a part thereof other than that portion of the wall which is destined for the emission of rays. The constricted portion 10 of the discharge tube 1 contains a quantity of adsorbing material 11 which may be applied thereto before the sealing of the stem, and may consist of finely divided carbon or highly activated adsorption carbon when the substance taking part in the discharge consists of iodine, or may consist of calcium fluoride or carbon when sodium vapour is introduced into the tube. In the example shown the tube consists of quartz and contains an incandescent wire cathode 5 coated with an electron emitting material, the anodes 8, 9 being in the form of rectangular metal plates mounted on wires 6, 7. |
