Layered Voice Coil Camera Module for Higher Actuator Thrust
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Solution Overview
Problem
Existing camera modules face challenges in implementing auto focus and image stabilization functions due to insufficient thrust generated by actuators, particularly voice coil motors, which require improved performance to ensure stable operation.
Innovation Solution
The camera module incorporates a coil unit with multiple layers, where the first coil layer has a smaller cross-sectional area and a higher number of turns in a stronger magnetic field area, and the second coil layer has a larger cross-sectional area with fewer turns in a weaker magnetic field area, optimizing thrust generation while reducing resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a single-layer coil is used in the actuator, then the device complexity is low, but the thrust generated is insufficient for stable auto focus and image stabilization
Solution Approach 1:
The coil is divided into multiple layers (first coil layer and second coil layer) with different cross-sectional areas and turn densities. This segmentation allows each layer to be optimized for its specific position in the magnetic field, generating sufficient thrust while maintaining manageable complexity through modular construction
Solution Approach 2:
Different regions of the coil have different properties: the first coil layer has smaller cross-sectional area and higher turn density for strong magnetic field regions, while the second coil layer has larger cross-sectional area and lower turn density for weak magnetic field regions. This local optimization maximizes thrust generation throughout the entire coil structure
2Force
If the coil has uniform cross-sectional area throughout, then the manufacturing is simple, but the thrust generation is not optimized across different magnetic field strengths
Solution Approach 1:
The coil structure transitions from uniform to non-uniform with different layers having different cross-sectional areas and turn densities matched to local magnetic field conditions, optimizing thrust generation where it is most needed while maintaining manufacturing feasibility through standardized layer construction
Solution Approach 2:
The solution moves from a single-dimensional uniform coil to a multi-dimensional layered structure where each layer can have different properties. This dimensional expansion allows optimization across multiple parameters (cross-sectional area, turn density, layer position) to maximize thrust while managing manufacturing complexity
3Force
If more coil turns are used to increase thrust, then the magnetic force increases, but the resistance increases and current consumption increases
Solution Approach 1:
The coil uses variable turn density across different layers: higher turn density in the first layer where the magnetic field is strongest (maximizing force per turn), and lower turn density in the second layer where the magnetic field is weaker. This local optimization increases thrust while minimizing resistance and current consumption by placing turns strategically where they are most effective
Solution Approach 2:
The invention changes the parameters of the coil structure (cross-sectional area, turn density, layer position) to optimize the relationship between thrust generation and electrical resistance. By varying these parameters across different layers, the system achieves higher thrust with reduced current consumption compared to a uniform coil design
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 configuration enhances the total thrust produced by the actuator, improving the camera module's ability to perform auto focus and image stabilization functions with increased efficiency and reduced current consumption.
Implementation Method 1
the actuator is a voice coil motor formed using an electromagnetic force and may include a magnet or coil. Thrust may be generated when a current flows through the coil in a magnetic field generated by the magnet
Data Source
AI summary
An electronic device, according to one embodiment, comprises: a housing which forms the exterior of the electronic device, and a camera module which has at least a portion thereof disposed inside the housing. The camera module comprises: a fixed part which is fixedly disposed in the electronic device, a movable part which is connected to a lens or an image sensor and is movable with respect to the fixed part, and an actuator which comprises a magnet unit and a coil unit disposed so as to face each other, and which moves the movable part relative to the fixed part. The coil unit may comprise a first coil layer which comprises a coil having a first coil turn cross-sectional area, and a second coil layer which is positioned relatively farther from the magnet unit than the first coil layer, and comprises a coil having a second coil turn cross-sectional area greater than the first coil turn cross-sectional area. Other various embodiments are possible.