| 摘要 |
1,236,359. Electric filter elements. SOC. ANON. DE TELECOMMUNICATIONS. 7 April, 1970 [2 May, 1969], No. 16365/70. Heading H1R. An electric filter element comprises a variable inductance 39 and one or more fixed capacitors, 32, 33, 34, disposed inside a metal casing consisting of a metal cap 49 and a metal base-plate 15. The capacitors are insulated from each other and from the inductance by insulating plates 35, 36, 37 and are stacked parallel to the base-plate in an insulating plinth 19. The inductance is held in place, above the capacitors, by flexible lugs 44, 45, 46, 47 of the plinth 19. The components are arranged so that their connecting tags are situated in the immediate vicinity of the external connection pins 16, 17, 18, which are at the corners of the base-plate 15, so that soldered connections can easily be made where required. The external connection pins 16, 17, 18 are insulated from the base-plate by glass beads. The inductance may be altered to the required value by adjusting a screw 52 through the aperture 50 at the top of the casing, the aperture being subsequently closed by welding a metal disk 53 over the aperture. The element may be filled with nitrogen or dry air to prevent any damage due to moisture.
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