Chip-type solid electrolytic capacitor having a terminal of a unique shape and method of producing the same

A chip-type solid electrolytic capacitor having a mounting surface and comprising:

• three capacitor elements laminated in a predetermined direction perpendicular to the mounting surface, each of the capacitor elements using a valve metal and having an anode member and a cathode layer mechanically coupled to the anode member;
• three anode lead wires each of which is led out from the anode member in parallel to the mounding surface;
• an anode terminal connected to the anode lead wires;
• a cathode terminal connected to the cathode layer;
• and
• an encapsulating resin encapsulating the capacitor elements with the anode and the cathode terminals partially exposed, the anode terminal including three branches having a first, a second, and a third branch end portion, respectively, which are formed by shaping, the first and the third branch end portions having shapes so as to overlap each other by rotation of 180° around a straight line, the second branch end portion being between the first and the third branch end portions, the first, the second, and the third branch end portions being welded to the anode lead wires to produce welded portions, respectively.

A chip-type solid electrolytic capacitor having a mounting surface and comprising:

• four capacitor elements laminated in a predetermined direction perpendicular to the mounting surface, each of the capacitor elements using a valve metal and having an anode member and a cathode layer mechanically coupled to the anode member;
• four anode lead wires each of which is led out from the anode member in parallel to the mounding surface;
• an anode terminal connected to the anode lead wires;
• a cathode terminal connected to the cathode layer;
• and
• an encapsulating resin encapsulating the capacitor elements with the anode and the cathode terminals partially exposed, the anode terminal including four branches having a first, a second, a third, and a fourth branch end portion, respectively, which are formed by shaping, the first and the fourth branch end portions having shapes so as to overlap each other by rotation of 180° around a straight line, the second and the third branch end portions being between the first and the fourth branch end portions and having shapes so as to overlap each other by rotation of 180° around the straight line, the first, the second, the third, and the fourth branch end portions being welded to the anode lead wires to produce welded portions, respectively.

A method of producing a chip-type solid electrolytic capacitor having a mounding surface and comprising a plurality of capacitor elements which are laminated in a direction perpendicular to the mounting surface and electrically connected in parallel, each of the capacitor elements having an anode member using a valve metal, an anode lead wire led out from the anode member, and a cathode layer mechanically coupled to the anode member, the method comprising the steps of:

• preparing a lead frame having an anode terminal forming portion and a cathode terminal forming portion, the anode terminal having a-center line and a plurality of branches symmetrical with each other with respect to the center line;
• shaping the branches by bending;
• welding the capacitor elements to the anode terminal forming portion and connecting the cathode layer to the cathode terminal forming portion;
• molding the capacitor elements, connected to the lead frame, by an encapsulating resin to obtain a molded body;
• and
• cutting the lead frame to separate a part of the lead frame from the molded body.

A chip-type solid electrolytic capacitor having a mounting surface and comprising:

• a capacitor portion having a plurality of capacitor elements laminated in a predetermined direction perpendicular to the mounting surface, each of the capacitor elements using a valve metal;
• a cathode terminal led out from the capacitor portion;
• a plurality of anode lead wires led out from the capacitor portion in parallel to the mounting surface, the anode lead wires being positioned apart from each other in the predetermined direction;
• an anode terminal connected to the anode lead wires;
• and
• an encapsulating resin encapsulating the capacitor portion with the anode and the cathode terminals partially exposed,
• the anode terminal including a plurality of branch end portions which are positioned apart from each other in the predetermined direction and welded to the anode lead wires, respectively.