Anode geometry with improved volumetric efficiency and improved ESR
View Patent ↗A capacitor with improved ESR and improved volumetric efficiency. The capacitor has an anode body wherein the anode body comprises a face and an inward offset which is inset from the face by a distance. An anode wire extends from a front side of the anode body wherein the front side is adjacent the face. A dielectric is on the anode body and a conductive cathode layer is on the dielectric. A cathode lead is in the inward offset and in electrical contact with the conductive cathode layer wherein the conductive cathode layer is between the cathode lead and the inward offset.
1. A capacitor comprising:
an anode body wherein said anode body comprises a face and an inward offset which is inset from said face by a distance;
an anode wire extending from a front side of said anode body wherein said front side is adjacent said face;
a dielectric on said anode body;
a conductive cathode layer on said dielectric; and
a cathode lead in said inward offset and in electrical contact with said conductive cathode layer wherein said conductive cathode layer is between said cathode lead and said inward offset.
2. The capacitor of claim 1 wherein said anode body comprises two inward offsets.
3. The capacitor of claim 1 wherein said anode body comprises a valve metal.
4. The capacitor of claim 3 wherein said valve metal comprises a material selected from the group consisting of tantalum, niobium and aluminum.
5. The capacitor of claim 3 wherein said anode body comprises a material selected from the group consisting of Nb, Ta, Al and NbO.
6. The capacitor of claim 1 wherein said cathode lead does not extend beyond a plane containing said face.
7. The capacitor of claim 1 further comprising a resin encasing at least a portion of said capacitor.
8. The capacitor of claim 7 wherein said cathode lead is planer within said resin.
9. The capacitor of claim 7 wherein said resin is between said cathode lead and a back side of said anode wherein said back side is opposite said front side.
10. The capacitor of claim 1 wherein said distance is at least as large as a cross-sectional thickness of said cathode lead.
11. The capacitor of claim 1 wherein said distance is ±0.05 mm of a cross-sectional thickness of said cathode lead.
12. The capacitor of claim 1 wherein said distance is at least about 0.025 mm to no more than about 0.51 mm.
13. The capacitor of claim 12 wherein said distance is at least about 0.05 mm to no more than about 0.25 mm.
14. The capacitor of claim 13 wherein said distance is at least about 0.076 mm to no more than about 0.20 mm.
15. A capacitor comprising:
an anode body wherein said anode body comprises faces on opposing sides and inward offsets which are inset from said faces by a distance;
an anode wire extending from a front side of said anode body wherein said front side is adjacent said faces;
a dielectric on said anode body;
a conductive cathode layer on said dielectric; and
a cathode lead in said inward offset and in electrical contact with said conductive cathode layer wherein said conductive cathode layer is between said cathode lead and an inward offset of said inward offsets and wherein said cathode lead does not extend beyond a plane containing said face.
16. The capacitor of claim 15 wherein said anode body comprises a valve metal.
17. The capacitor of claim 16 wherein said valve metal comprises a material selected from the group consisting of tantalum, niobium and aluminum.
18. The capacitor of claim 16 wherein said anode body comprises a material selected from the group consisting of Nb, Ta, Al and NbO.
19. The capacitor of claim 15 further comprising a resin encasing at least a portion of said capacitor.
20. The capacitor of claim 19 wherein said resin is between said cathode lead and a back side of said anode wherein said back side is opposite said front side.
21. The capacitor of claim 15 wherein said distance is at least as large as a cross-sectional thickness of said cathode lead.
22. The capacitor of claim 15 wherein said distance is ±0.05 mm of a cross-sectional thickness of said cathode lead.
23. The capacitor of claim 15 wherein said distance is at least about 0.025 mm to no more than about 0.51 mm.
24. The capacitor of claim 23 wherein said distance is at least about 0.05 mm to no more than about 0.25 mm.
25. The capacitor of claim 24 wherein said distance is at least about 0.076 mm to no more than about 0.20 mm.