| 摘要 |
432,320. Discharge lamps. GENERAL ELECTRIC CO., Ltd., Magnet House, Kingsway, London.-(Patent - Treuhand-Ges. fur Elektrische Gl³hlampen; 11, Ehrenbergstrasse, Berlin.) June 29, 1934, Nos. 19268/34 and 6735 /35. [Class 39 (i)] In a lamp all the electrodes are composed of tellurium and the envelope is of a transparent material such as quartz capable of withstanding for a life of at least 100 hours the attack of tellurium vapour at a temperature corresponding to a pressure of 0.1 mm. Fluorescent substances excited by the ultraviolet component of the light may be associated with the lamp, or the lamp may be used for therapeutic purposes. An outer heat insulating envelope may surround the lamp, which yields a light approximating to daylight. To prevent fracture of the envelope on starting the discharge, each electrode chamber 2 may be conical and may be lined with a resilient helix 7 wrapped round the lead 4 and welded to it at 5. The tellurium 8 should fill the chamber up to the height of the helix 7. Instead of the helix 7 a resilient slotted sheet-metal cone may be used. The tube 1 contains a rare gas for starting purposes. During operation the pressure of the tellurium vapour may be 0.1 mm., 1 mm. or 10 mms. |
