| 摘要 |
484,328. Discharge lamps. GENERAL ELECTRIC CO., Ltd. (Patent-Treuhand-Ges. f³r Elektrische Gl³hlampen) Dec. 18, 1936, No. 34839. [Class 39 (i)] Relates to lamps of the type comprising a sealed envelope 12, which may be gas filled, containing a high-pressure mercury vapour discharge lamp 1 and a filament 6 adapted to be raised to incandescence. In order to obtain a substantial transmission of the U.V. radiation from the lamp 1 to the exterior and also to mix the radiations from the lamp 1 and the filament 6, the envelope of the lamp 1 is of quartz or other vitreous material transparent to U.V. radiation, the filament 6 surrounds the envelope of the lamp 1 at least partially, and the envelope 12 is also of a material, such as borosilicate glass with high silica content, transparent to U.V. radiation and frosted on the outside. The envelope of the lamp 1 is preferably tubular and the filament preferably lies in or near a plane perpendicular to the axis of the tube and bisecting the discharge path. The filament forms a segment of a circle whose diameter is equal to the length of the discharge path and whose centre lies on the axis of the tube. In the arrangement described the filament is in series with the discharge path. At starting it is in series with a starting electrode 9. British Specification 396,210 and U.S.A. Specifications 1,976,149 and 2,020,737 are referred to. |
