Chip Resistor Electrode Boundary Positioning
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Solution Overview
Problem
Conventional chip resistors face mechanical strength issues and potential damage when made thinner, leading to substrate cracking and deviations in resistance values during mounting due to a large gap between electrodes and the circuit board.
Innovation Solution
A chip resistor design with a substrate made of insulating material, featuring electrode layers and a conductive layer positioned closer to the substrate than the protective layer, eliminating the level difference and enhancing mechanical strength, along with a manufacturing method that includes forming electrode layers, a resistive layer, and protective layers to ensure even thickness and robust mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the substrate thickness is reduced to achieve a thinner profile, then the chip resistor size and profile are smaller, but the substrate loses mechanical strength and may crack or bend during mounting
Solution Approach 1:
The patent applies preliminary action by forming a filling layer in advance within the space between the electrode and substrate before mounting. This filling layer is prepared beforehand to provide mechanical support, preventing substrate cracking and bending that would occur if the substrate were made thinner without additional reinforcement.
Solution Approach 2:
The filling layer acts as an intermediary element between the electrode and substrate. It fills the gap space and provides mechanical reinforcement to the thin substrate, mediating the structural weakness that would otherwise result from reducing substrate thickness while maintaining the thin profile design.
2Length of moving object
If the substrate thickness is reduced to achieve a thinner profile, then the chip resistor size and profile are smaller, but the chip resistor may be damaged through bending during mounting
Solution Approach 1:
The filling layer is formed in advance within the electrode-substrate gap to provide preventive mechanical support. This preliminary structural reinforcement prevents bending damage during mounting operations, ensuring reliability even when the substrate is made thinner for compact designs.
Solution Approach 2:
The filling layer serves as a cushioning element prepared beforehand in the gap between electrode and substrate. It absorbs and distributes mechanical stresses during mounting, preventing bending damage to the thin substrate and ensuring the chip resistor maintains its reliability despite reduced thickness.
3Length of moving object
If the substrate thickness is reduced, then the chip resistor profile is thinner, but the exposed region of the bottom surface creates a large gap that causes level difference and mechanical weakness
Solution Approach 1:
The patent extracts and eliminates the problematic gap structure by filling the space between the electrode and substrate with a filling layer. This removes the source of level difference and mechanical weakness, simplifying the overall structure while maintaining the thin profile achieved through reduced substrate thickness.
Solution Approach 2:
The filling layer merges the previously separate electrode and substrate structures by filling and connecting the gap between them. This integration eliminates the level difference and creates a unified mechanical structure, reducing complexity while enabling thinner substrate design.
Data Source
AI summary
A chip resistor includes a substrate, a pair of electrode elements, a resistive layer, and a protective layer. The substrate is insulating and includes a first surface, a second surface opposite the first surface and a thickness defined between the first and second surface. The electrode elements are formed on the first and spaced apart. The resistive layer is formed on the first surface and electrically connected to the electrode elements. The protective layer to covers the resistive layer. The first surface faces toward a mounting target, on which the chip resistor is mounted. Each of the electrode elements comprises an electrode layer and a conductive layer formed on the electrode layer. The boundary between the electrode layer and the conductive layer in each of the electrode elements is positioned closer to the substrate than the end surface of the protective layer in the thickness direction of the substrate.