| 摘要 |
1528818 Discharge lamps PATENTTREUMAND - GES FUR ELEKTRISCHE GLUHLAMPEN mbH 14 Jan 1976 [10 March 1975] 01451/76 Heading H1D A low pressure mercury vapour discharge lamp, e.g. a fluorescent lamp, has an amalgam comprising Hg and an amalgam-forming metal which is contained in a porous silicate mass prepared by admixing the amalgam in water glass solution and which is secured to the internal surface of the lamp. The amalgamforming metal may be indium, cadmium, indium-magnesium or indium-calcium, and the water glass comprises sodium silicate and/or potassium silicate solution preferably having a density of 1À35 to 1À39. The water glass solution may be diluted with water in a ratio of up to 1 : 15 by volume. As shown, a droplet 10 of the amalgam and water glass solution is applied to the flare stem 4, alternatively it may be applied to the electrode mount or to the lamp bulb. To assist in starting the lamp a run-up amalgam consisting of 10% of the main amalgam is applied using water glass closer to the electrode than the main amalgam, e.g. as at 13 on the coil-encompasing metal cap 11 or as at 14 on the pinch seal 5. |
