Recessed Coil Component Electrodes for Compact Mounting Reliability
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Solution Overview
Problem
The challenge in miniaturizing coil components for electronic devices is the increase in component length due to external electrode formation, which affects mounting efficiency and leads to potential short-circuits and reduced effective mounting area.
Innovation Solution
A coil component design featuring a body with recesses for external electrodes, where the pad portion is longer than the connection portion, and an insulating layer is used to expose the connection portion, enhancing bonding force and preventing short-circuits while reducing size and thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external electrodes are formed by coating and curing conductive paste on both end surfaces of the component body, then the electrical connection is improved, but the length of the entire component increases
Solution Approach 1:
The external electrode is designed with a pad portion that extends in the width direction rather than only in the length direction. The pad portion has a length in the width direction that is greater than the length of the connection portion in the length direction, transforming the electrode geometry from a linear extension to a two-dimensional footprint expansion, thereby achieving reliable electrical connection without increasing component length
Solution Approach 2:
The external electrode is divided into two distinct portions: a connection portion disposed in the recess that connects to the coil portion, and a pad portion disposed on the sixth surface that provides the mounting interface. This segmentation allows each portion to be optimized independently - the connection portion for electrical connectivity and the pad portion for mounting area, resolving the contradiction between connection reliability and component length
2Volume of moving object
If the component size is reduced for miniaturization, then the mounting area is improved, but the bonding force of the external electrode may be reduced
Solution Approach 1:
The pad portion is designed to extend primarily in the width direction rather than the length direction, increasing the bonding surface area in the lateral dimension while maintaining compact overall dimensions. This dimensional shift allows the component to achieve sufficient bonding force through increased pad width without increasing the component's length or volume
Solution Approach 2:
The external electrode exhibits different dimensional characteristics in different regions: the connection portion in the recess is optimized for electrical connection with appropriate length, while the pad portion on the sixth surface is optimized for bonding with extended width. This local differentiation of geometric properties allows the electrode to satisfy both connection reliability and bonding strength requirements within a miniaturized form factor
3Strength
If the external electrode length is increased to ensure proper bonding, then the bonding force is improved, but the effective mounting area is reduced and short-circuit risk increases
Solution Approach 1:
The pad portion extends in the width direction perpendicular to the length direction, providing increased bonding surface area without extending the component length. This orthogonal expansion of the electrode footprint allows sufficient bonding force to be achieved while preserving effective mounting area in the length direction and reducing short-circuit risk between adjacent components
Data Source
AI summary
A coil component is provided. The coil component includes a body having fifth and sixth surfaces opposing each other, first and second surfaces respectively connecting the fifth and sixth surfaces of the body and opposing each other, and third and fourth surfaces respectively connecting the first and second surfaces of the body and opposing each other in one direction, a recess disposed in an edge between one of the first and second surfaces of the body and the sixth surface of the body, a coil portion disposed inside the body and exposed through the recess, and an external electrode including a connection portion disposed in the recess and connected to the coil portion, and a pad portion disposed on one surface of the body. A length of the pad portion in the one direction is greater than a length of the connection portion in the one direction.