| 摘要 |
1,151,823. Glass-metal seals. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. 17 Aug. 1967 [20 Aug., 1966], No 37870/67. Heading C1M. [Also in Division H1] A method of manufacturing a glow-discharge bimetallic-contact switch comprises the steps of introducing a bimetallic strip electrode and a couhterelectrode into a glass envelope 7, heating an open part 8 of the envelope 7 through which extend the supply conductors 3, 4, 5, 6 for the electrodes 1, 2 to close the open part and to seal the electrodes 1, 2 to the wall 8 of the envelope 7, and, during this heating, cooling the bimetallic electrode to inhibit distortion thereof. As shown, both electrodes 1, 2 are bimetallic. The cooling is effected by inserting a pipe 9 into the envelope 7 such that the electrodes 1, 2 fit into the bore of pipe 9, and passing an inert gas such as nitrogen down the pipe bore, the gas being conducted away through outlets 10 in the wall of pipe 9. After the sealing process, pipe 9 and envelope 7 are separated and filled with gas. In another embodiment the gas supply pipe 9 is arranged inside the bore of a gas outlet pipe. The switch may be used for starting fluorescent tubes. The purpose of the cooling is to avoid changes in the gap setting between the electrodes due to heat reaching the bimetal electrode during the heat sealing. |
