Multilayer Ceramic Capacitor Curved Electrode Lead Parts
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Solution Overview
Problem
Multilayer ceramic capacitors with external electrodes on one height-direction surface experience weaker separation strength, leading to potential disconnection when mounted on a circuit board, especially when smaller in size and with a space between electrodes to prevent short-circuiting.
Innovation Solution
The capacitors feature inwardly curved lead parts of internal electrode layers on the capacitor body's surfaces, increasing the exposed area and connection strength without reducing capacitance, and a tapered design on one height-direction surface to enhance electrode contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the first external electrode and second external electrode are provided on one height-direction surface of the capacitor body, then the capacitance is increased by maximizing the external dimensions and contour dimensions of the internal electrode layers, but the separation strength of the external electrodes from the capacitor body is weakened
Solution Approach 1:
The lead parts of the internal electrode layers are curved inward rather than being straight, increasing the exposed area on the capacitor body surface. This curvature allows the external electrodes to contact a larger area of the capacitor body, thereby improving separation strength while maintaining the compact design that enables high capacitance
2Volume of moving object
If the multilayer ceramic capacitor is made smaller, then the external dimensions are reduced for miniaturization, but the contact area between the external electrodes and capacitor body is reduced leading to weaker separation strength
Solution Approach 1:
By curving the lead parts inward, the exposed area of the internal electrode layers on the capacitor body surface is increased. This allows the external electrodes to establish contact over a larger area even when the overall capacitor size is small, thereby maintaining adequate separation strength in miniaturized designs
3Reliability
If a space is provided between the first external electrode and second external electrode to prevent short-circuiting, then the risk of short-circuit is reduced, but the contact area of each external electrode with the capacitor body is further reduced leading to even weaker separation strength
Solution Approach 1:
The inward curvature of the lead parts increases the exposed area of each internal electrode layer, allowing each external electrode to contact a larger area of the capacitor body. This compensates for the reduced contact area caused by the necessary spacing between electrodes, thereby maintaining separation strength while preventing short-circuits
Data Source
AI summary
In an embodiment, a multilayer ceramic capacitor 10 is such that at least lead parts 14a of several first internal electrode layers 14 close to width-direction outer surfaces f3a, f4a of tapered part 11a are curved inward and the area of an exposed part of each curved lead part 14a is greater than the area of an exposed part of a lead part 14a free from curvature, while at least the lead parts 15a of several second internal electrode layers 15 close to width-direction outer surfaces f3a, f4a of the tapered part 11a are curved inward and the area of an exposed part of each curved lead part 15a is greater than the area of an exposed part of a lead part 15a free from curvature. The multilayer ceramic capacitor can mitigate separation of the first and second external electrodes from the capacitor body when mounted on a circuit board.