Leadless capacitors
AssigneeStandard Telephones and Cables, PLC
InventorsAlexander R. Conquest, Christopher F. Powling
Life of this patent
Estimating the term…
Abstract
Lead-less tantalum capacitors are made using a lead frame (1) formed to provide connection terminals (3,4) separated by an H-shaped aperture (7) and a bent-up anode support station (5). A two-part mould (13,13a) is used to injection mould plastics around the capacitor bodies prior to detaching the capacitors from the lead frame by severing necks (15,16,17,18). A second embodiment has flat connection terminals which are bent around the encapsulated body.
Claims6
A method of making lead-less solid electrolytic capacitor comprising:
- providing a lead frame of thin metal having, at each location along its length, an anode connection terminal having a bent-up part and connected to the lead frame by at least one neck located intermediate the ends of the terminal, and a cathode connection terminal connected to the lead frame by at least one neck located intermediate the ends of the terminal;
- providing a solid electrolytic capacitor body with an anode wire projecting therefrom and a cathode connection area on the body;
- welding the anode wire to the bent-up part and connecting the cathode connection area to the cathode connection terminal;
- employing a mould having two mould halves brought up against opposite sides of the lead frame defining a moulding cavity around the body and the connection terminals to encapsulate the body, the anode wire and portions of the anode and cathode connection terminal adjacent the body;
- and
- separating the encapsulated body from the lead frame by severing at least one of the connection webs.
A method of making a solid electrolytic leadless capacitor comprising:
- providing a lead frame of thin metal having, at each of a plurality of locations, anode and cathode connection terminals;
- bending up a part of the anode connection terminal to provide a welding edge;
- providing a solid electrolytic capacitor body, the body having a cathode connection area at one end and an anode wire projecting from the opposite end;
- locating the body on the terminals and connecting the cathode connection area to the cathode connection terminal and welding the anode wire to an edge of the bent up part;
- applying a mould to the lead frame to define for each capacitor a mould cavity;
- moulding an insulating material around the capacitor body;
- removing the mould to provide an encapsulated capacitor with surfaces of the terminals exposed;
- and
- removing the encapsulated capacitors from the lead frame.
A solid electrolytic lead-less capacitor comprising:
- a capacitor body having an anode wire projecting therefrom and a cathode connection area on the surface of the body remote from the anode wire;
- a cathode connection terminal of bent metal strip and having one limb thereof connected to the cathode connection area;
- an anode connection terminal of bent metal strip and having a bent-up portion extending transversely in relation to the anode wire and welded directly to the anode wire;
- and
- the capacitor body being encapsulated solely in insulating material which has been moulded directly around the capacitor and which has a generally rectangular external configuration, each connection terminal extending over an adjacent end face of the moulded encapsulating material and over part of a common side face of the encapsulating material for making external electrical connections to the capacitor.
Dependencies are inferred from the claim text.