Electrolytic Capacitor Seating Plate With Narrow-Wide Projection
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Solution Overview
Problem
The surface-mounting type electrolytic capacitor faces limitations in increasing the size of projections on the insulating plate to accommodate solder paste escape, leading to potential warpage and reduced joint strength when downsized.
Innovation Solution
The electrolytic capacitor and seating plate design includes a bottomed cylindrical container with lead terminals and a seating plate featuring through-holes, terminal storage grooves, and a projection with narrow and wide portions, which increases the projection area, enhancing the rigidity and reducing warpage, thereby maintaining joint strength during substrate mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the insulating plate is thinned for downsizing, then the size of the electrolytic capacitor is reduced, but warpage is caused in the insulating plate and joint strength is reduced
Solution Approach 1:
The invention transitions from a single-planar projection structure to a multi-level three-dimensional structure by adding a first projection and a second projection at different heights on the seating plate. This dimensional change allows the structure to provide enhanced mechanical support and solder paste containment without increasing the planar footprint, thereby maintaining joint strength while enabling downsizing of the overall capacitor package.
2Reliability
If the projection size is increased to secure space for solder paste escape, then mounting stability is improved, but the capacitor size increases
Solution Approach 1:
By utilizing the vertical dimension with projections of different heights (first projection and second projection), the invention provides adequate space for solder paste escape and mounting stability without expanding the planar dimensions. The multi-level structure efficiently uses vertical space to achieve reliable soldering while maintaining a compact overall size.
Solution Approach 2:
The nested doll principle is applied by placing the first projection and second projection in a hierarchical arrangement where the second projection is positioned at a different height level relative to the first projection. This nested, multi-level configuration maximizes the use of vertical space within the compact footprint, providing functional benefits without increasing the external dimensions of the capacitor.
Data Source
AI summary
An electrolytic capacitor includes a capacitor body and a seating plate having an attachment surface to which the capacitor body is attached. The seating plate has a pair of through-holes into which a pair of lead terminals is inserted, respectively. A mounting surface of the seating plate has a pair of terminal storage grooves and a projection. Distal end portions of the pair of lead terminals inserted into the pair of through-holes, respectively, to be bent along the mounting surface are inserted into the pair of terminal storage grooves, respectively. The projection protrudes from a portion including at least an intermediate portion between the pair of through-holes. The projection includes a narrow portion and wide portions. The narrow portion is positioned between the pair of through-holes. The wide portions are disposed respectively at both sides with respect to the narrow portion in a second axis intersecting a first axis along which the pair of through-holes are arranged. A width of the wide portion in a first axis is larger than a width of the narrow portion in the first axis.