| 摘要 |
731,588. Leading-in conductors. PHILIPS ELECTRICAL INDUSTRIES, Ltd. Dec. 2, 1953 [Dec. 5, 1952], No. 33486/53. Class 39 (2). [Also in Group XXXVI] In order to reduce their resistance to high-frequency current the contact pins forming the external portions of leading-in conductors sealed into the base of an electric discharge tube are provided with a cobalt-containing layer which is covered by an outer layer of gold. The intermediate layer may consist of pure cobalt or an alloy of cobalt with nickel and/or iron. The whole of the leading-in conductor, which may be made of chrome-iron, may be provided with layers of cobaltcontaining alloy and gold respectively. Alternatively the leading-in conductor may be of composite form, comprising a part 8 which serves as a contact pin and may be made of nickel, iron, nickel-iron or chrome-iron, a sealing part 7 of copper-clad nickel-iron wire, and a part 6 intended to be located within the tube or envelope of the discharge device and made of iron, molybdenum, or other metal such as that used for the part 8, the complete conductor being coated with a cobalt-containing intermediate layer 4 and a gold layer 5, the latter being 0.5 micron thick. The layers may be deposited on the composite conductor electrolytically by successive operations in apparatus of the rotary drum type (see Group XXXVI). |
