Stacked Camera Module Coil Layout for Higher Actuator Thrust
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Solution Overview
Problem
Existing camera modules require improved thrust generation for effective auto focus and image stabilization functions, particularly in electromagnetic actuators.
Innovation Solution
The camera module incorporates a stacked coil design with varying coil turn cross-sectional areas to enhance thrust generation in the actuator, optimizing current density distribution based on the magnetic field strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a uniform coil design is used in the actuator, then the manufacturing is simple, but the thrust generation is insufficient
Solution Approach 1:
The patent applies local quality by varying the coil turn cross-sectional area at different positions along the optical axis. The first coil layer has a smaller cross-sectional area than the second coil layer, creating non-uniform current density distribution that optimizes thrust generation in different magnetic field regions. This resolves the contradiction by making the coil structure non-uniform to improve thrust while maintaining manufacturability through a systematic design approach.
Solution Approach 2:
The coil unit is segmented into multiple coil layers (first coil layer and second coil layer) with different cross-sectional areas. Each layer is positioned at different distances from the magnet unit, allowing independent optimization of thrust generation at different positions. This segmentation enables the actuator to generate sufficient thrust without requiring an overly complex monolithic coil structure.
2Force
If the coil turn cross-sectional area is increased to generate more thrust, then the thrust efficiency improves, but the resistance increases
Solution Approach 1:
The patent implements local quality by creating a gradient in coil turn cross-sectional area across different layers. The first coil layer (closer to the magnet) has a smaller cross-sectional area, while the second coil layer (farther from the magnet) has a larger cross-sectional area. This gradient design optimizes current density distribution to match the magnetic field strength distribution, improving thrust efficiency while controlling resistance by not uniformly increasing the cross-sectional area throughout.
Solution Approach 2:
The patent changes the parameter of coil turn cross-sectional area systematically across different layers. By varying this parameter (smaller in the first layer, larger in the second layer), the design optimizes the balance between thrust generation and resistance. This parameter change allows the actuator to achieve high thrust efficiency in the stronger magnetic field region closer to the magnet while managing overall resistance.
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
This design increases thrust efficiency while minimizing resistance, thereby enhancing the performance of auto focus and image stabilization functions.
Implementation Method 1
Thrust may be generated when a current flows through the coil in a magnetic field generated by the magnet
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
An electronic device includes a housing forming an exterior of the electronic device, and a camera module at least a portion of which is disposed inside the housing. The camera module includes a fixed part that is in a fixed position relative to the electronic device, a movable part connected to a lens or an image sensor and configured to move relative to the fixed part, and an actuator including a magnet unit and a coil unit disposed to face each other and configured to move the movable part relative to the fixed part, wherein the coil unit includes a first coil layer including a coil having a first coil turn cross-sectional area, and a second coil layer positioned relatively farther from the magnet unit than the first coil layer and including a coil having a second coil turn cross-sectional area larger than the first coil turn cross-sectional area. In addition, various embodiments are possible.