Capacitor with cold-flow-extruded electrodes

• US 6,170,138 B1
• Filed: 03/06/1998
• Issued: 01/09/2001
• Est. Priority Date: 03/08/1997
• Status: Expired due to Term

• Current Assignee: Comet AG (Lipro AG Logistik & Information für die Produktion)
• Original Assignee: Comet Technik AG
• Inventors: Hug, Bernhard, Von Planta, J. Andrea
• Primary Examiner(s): Young, Lee
• Assistant Examiner(s): Trinh, Minh
• Application Number:
  US09/036,300
• Time in Patent Office: 1,040 Days
• Field of Search: 29/254.1, 29/254.2, 296/05, 294/24, 294/23, 361/271, 361/272, 361/321.2, 361/278, 361/279, 361/296, 361/298
• US Class Current: 29/25.41
• CPC Class Codes: H01G 4/02 Gas or vapour dielectrics
• CPC Class Codes: H01G 5/14 due to longitudinal movement of electrodes
• CPC Class Codes: Y10T 29/43 Electric condenser making
• CPC Class Codes: Y10T 29/435 Solid dielectric type
• CPC Class Codes: Y10T 29/4981 Utilizing transitory attached element or associated separate material

Abstract

A capacitor is described, in particular a vacuum capacitor, comprising two electrodes (1, 1′), at least one insulator (5), and means for fastening (4, 4′).

A process is proposed according to which the two electrodes (1, 1′) are each produced as one piece of an electrode material through a cold-flow extrusion process. The electrodes so produced are distinguished by a high surface quality. The result of this, in the capacitors produced from such electrodes, is high quality-factors, low temperature coefficients, a high current-carrying capacity, and an excellent dielectric strength, as well as a compact structure with a simultaneous reduction in the number of components required.

Capacitors of this type, in particular vacuum capacitors, find application in HF technology for fixed and variable capacitance values.

Claims

1. A method of producing a capacitor which comprises a first electrode, a second electrode, at least one insulator, and a fastener which fastens the first and second electrodes, the method comprising:

providing a single piece; and

extruding the first and second electrodes by a cold-flow extrusion process from the single piece, wherein the first and second electrodes are generated in the single piece having concentric electrode plates arising perpendicular from a mounting plate and having means for fastening the capacitor, and wherein after the cold-flow extrusion process, the first and second electrodes each comprise respective surfaces requiring no retouching.

2. The method of claim 1 further comprising:

assembling the first and second electrodes wherein after the cold-flow extrusion process, the first and second electrodes each comprise respective surfaces requiring no retouching, the at least one insulator, and a soldering material in a fixation tool by which an equidistant spacing of the electrodes is achieved;

evacuating and heating the assembly in a vacuum furnace to a temperature below a melting point of the soldering material;

arising the temperature over the melting point of the soldering material to initialize a soldering process;

sealing the capacitor in a vacuum-tight manner; and

cooling down the capacitor.

3. The method of claim 2, wherein the assembled capacitor is a vacuum capacitor.