Chip Resistor Terminal Design for Mounting Area Reduction
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Solution Overview
Problem
The increasing miniaturization and precision in electronic devices lead to a problem of increased mounting area requirements for multiple resistors on printed circuit boards, which is undesirable for compact designs.
Innovation Solution
A chip resistor design featuring a base substrate with a resistive layer and terminals, where the third terminal extends along the side surfaces, enhancing bonding strength and preventing excessive solder issues, thus optimizing the mounting area and ensuring stable connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple resistors are used to satisfy circuit specifications, then the circuit functionality is improved, but the mounting area on the printed circuit board increases
Solution Approach 1:
The patent combines multiple resistor functions into a single chip resistor component by integrating a resistive layer with multiple terminals (first terminal, second terminal, and third terminal) on one base substrate. This allows the component to function as multiple resistors simultaneously, reducing the number of separate components needed and thereby decreasing the total mounting area on the printed circuit board while maintaining the required circuit functionality
2Reliability
If the third terminal extends along the side surfaces to the first surface, then the bonding strength and connection stability are improved, but the device complexity increases
Solution Approach 1:
The third terminal extends from the second surface along the side surfaces of the base substrate to reach the first surface, utilizing the vertical dimension rather than only the horizontal plane. This three-dimensional terminal configuration improves bonding strength and connection stability by providing longer contact paths and better mechanical anchoring, while the complexity is managed by the straightforward extension along the existing side surfaces of the rectangular base substrate
Data Source
AI summary
A chip resistor includes a base substrate having a first surface and a second surface opposing each other, two side surfaces connecting the first surface and the second surface, and two end surfaces connecting the first surface and the second surface, a resistive layer disposed on the second surface of the base substrate, the resistive layer having a first surface in contact with the base substrate and a second surface opposing the first surface of the resistive layer, a first terminal and a second terminal spaced apart from each other and each being connected to the resistive layer on the second surface of the resistive layer, and a third terminal connected to the resistive layer on the second surface of the resistive layer, disposed between the first terminal and the second terminal, and extending to the first surface of the base substrate along the side surfaces.