Camera Aperture Module with Magnetic Low-Power Blade Positioning
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Solution Overview
Problem
The challenge of implementing mechanical apertures in miniaturized camera modules is exacerbated by power consumption issues due to the need for electricity near coils, and the difficulty in fitting such mechanisms in narrow spaces within increasingly compact electronic devices.
Innovation Solution
A camera module utilizing a bistable drive system with magnets to adjust the aperture diameter, employing blades fixed in multiple positions using repulsive forces, minimizing power consumption and module height by linearly operating a blade drive part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mechanical aperture is implemented in a miniaturized camera module, then the aperture function is achieved, but the module height and head diameter increase
Solution Approach 1:
The patent replaces the traditional mechanical aperture system with a magnetic field-based system. A voice coil generates a magnetic field that interacts with a magnet attached to the aperture blade, enabling aperture adjustment without complex mechanical linkages. This substitution reduces the mechanical structure's height and diameter while achieving the same aperture control function.
2Reliability
If electricity is applied to the yoke near the coil for aperture operation, then the blade position is fixed, but power consumption increases even when the camera module is deactivated
Solution Approach 1:
The patent implements periodic action by applying electricity to the voice coil only when aperture adjustment is needed, not continuously. The magnetic field is generated temporarily to move the aperture blade to the desired position, then power is cut off. The blade position is maintained by the mechanical structure and magnetic attraction without continuous power supply, reducing power consumption while maintaining reliable position fixation.
3Ease of operation
If a traditional mechanical aperture system is used, then the aperture can be adjusted, but the structure becomes complex and occupies more space
Solution Approach 1:
The patent replaces complex mechanical linkages with a direct magnetic actuation system. The voice coil generates a magnetic field that directly acts on the magnet attached to the aperture blade, eliminating the need for intermediate mechanical components such as gears, levers, and springs. This simplification reduces structural complexity while maintaining ease of aperture adjustment through electrical control.
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 allows for low-power operation and minimal increase in module height by using magnetic repulsion to fix blade positions, effectively adjusting the aperture diameter while reducing power consumption and maintaining compactness.
Implementation Method 1
a blade drive coil disposed opposite to the blade drive magnet, wherein in accordance with a current applied to the blade drive coil, the camera module is configured to adjust a diameter of the lens incident hole by linearly moving the linear moving part within a blade drive aperture
Implementation Method 2
blades capable of being fixed in two or more positions using the repulsive force of magnets
Data Source
AI summary
A camera module is provided. The camera module includes a lens assembly, a blade set disposed on an upper surface of the lens assembly and adjusting a diameter of a lens incident hole, a rotational drive part connected to the blade set and controlling movement of blades through a rotary motion, a blade connecting part connected to one side of the rotational drive part and rotating the rotational drive part, a linear moving part connected to the blade connecting part and accommodating a blade drive magnet on its outer side and a blade drive coil disposed opposite to the blade drive magnet, wherein in accordance with a current applied to the blade drive coil, the camera module adjusts a diameter of the lens incident hole by linearly moving the linear moving part within a blade drive aperture, which is disposed on a first side of a side frame.