Camera OIS Coil Layout With Dummy Electrodes for Plating Uniformity
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Solution Overview
Problem
Conventional camera modules with optical image stabilization (OIS) type coil patterns face reliability issues due to thickness-related pattern collapse, leading to increased resistance and reduced electromotive force, which affects the camera's anti-shake performance.
Innovation Solution
A coil member with a substrate featuring first and second coil electrodes on opposite surfaces and a dummy electrode pattern that controls the plating thickness uniformly, ensuring stable formation and reduced resistance, thereby enhancing the camera's anti-shake capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the coil pattern is formed with increased line width and thickness to reduce resistance, then the electromotive force generation is improved, but pattern collapse occurs reducing reliability
Solution Approach 1:
The patent transitions from a single-layer coil pattern to a multi-layer structure with first and second coil electrodes disposed on opposite surfaces of a substrate. This dimensional change allows the coil pattern to achieve greater effective thickness and reduced resistance without increasing the line width of individual patterns, thereby avoiding pattern collapse while improving electromotive force generation.
Solution Approach 2:
The coil pattern is segmented into multiple independent electrode layers (first coil electrode on upper surface, second coil electrode on lower surface) connected through conductive vias. This segmentation allows each layer to maintain thinner, more reliable individual patterns while the combined multi-layer structure achieves the necessary overall thickness for low resistance and high electromotive force generation.
2Power
If the coil pattern thickness is increased to reduce resistance, then the electromotive force is improved, but manufacturing precision deteriorates due to pattern collapse
Solution Approach 1:
The patent resolves manufacturing precision issues by distributing the required thickness across multiple layers separated by a substrate. Each individual coil electrode layer can be manufactured with precise, thin patterns using standard fabrication processes, while the multi-layer configuration achieves the necessary overall thickness for low resistance without requiring any single pattern to be excessively thick and prone to collapse.
3Manufacturing precision
If a dummy electrode is added to uniform plating thickness, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The dummy electrode is merged with the functional coil electrodes by disposing all electrodes (first coil electrode, second coil electrode, and dummy electrode) on the same substrate in a coordinated arrangement. This integration allows the dummy electrode to perform its plating uniformity function while the combined electrode structure works together as a unified system, reducing overall complexity compared to separate dummy electrode structures.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively secures the thickness of the coil pattern, reduces resistance, and improves the electromotive force generation, resulting in improved characteristics and anti-shake performance of the camera module.
Implementation Method 1
a coil electrode that generates electromotive force
Data Source
AI summary
A coil member according to an embodiment comprises: a substrate including an upper surface and a lower surface opposite to the upper surface; a first coil electrode disposed on the upper surface of the substrate and including first pattern electrodes; a second coil electrode disposed on the lower surface of the substrate and including second pattern electrodes; and third pattern electrodes disposed on the upper surface and the lower surface of the substrate, wherein a distance between the first pattern electrodes is different from a distance between the first pattern electrodes and the third pattern electrodes, and a distance between the second pattern electrodes is different from a distance between the second pattern electrodes and the third pattern electrodes.