Adjustable Aperture Module With Hall-Sensed Magnetic Drive
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Solution Overview
Problem
Conventional adjustable aperture modules face challenges in compact camera modules due to susceptibility to damage, excessive weight, and difficulty in balancing miniaturization with precision and magnetic driving force requirements.
Innovation Solution
An adjustable aperture module comprising a blade assembly, a fixed component, a movable component, and a driving mechanism with a coil assembly and magnet configuration that allows for adjustable aperture size, utilizing a Hall sensor to detect magnetic field changes for precise control, optimizing spatial efficiency and magnetic driving force distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the aperture module is downsized for compact camera modules, then the compactness is improved, but the susceptibility to damage and manufacturing precision deteriorate
Solution Approach 1:
The aperture module is divided into separate components: a blade assembly with multiple light-blocking blades, a fixed component, and a movable component. This segmentation allows each part to be optimized independently, enabling miniaturization while maintaining precision through careful design of individual elements rather than requiring the entire assembly to be scaled down uniformly.
Solution Approach 2:
The light-blocking blades are arranged in a nested configuration where multiple blades overlap one another in the circumferential direction. This nesting approach maximizes the functional aperture control within a minimized radial space, achieving compact dimensions without sacrificing aperture size precision or blade positioning accuracy.
2Volume of moving object
If the aperture module is downsized, then the compactness is improved, but the magnetic driving force becomes insufficient
Solution Approach 1:
The magnetic driving system uses localized coil assemblies positioned at specific locations around the movable component, with magnets strategically placed on the movable component. This local concentration of magnetic elements maximizes the magnetic driving force density within the miniaturized structure, providing sufficient torque for blade actuation without requiring a large overall magnetic system.
Solution Approach 2:
The magnetic driving mechanism utilizes the axial dimension by arranging coil assemblies and magnets facing each other across the movable component thickness. This three-dimensional magnetic coupling approach generates effective driving force within a compact radial footprint, resolving the conflict between miniaturization and magnetic force generation.
3Volume of moving object
If the aperture module is downsized, then the compactness is improved, but the weight becomes excessive relative to size
Solution Approach 1:
The blade assembly uses thin light-blocking blades that are sufficiently rigid to maintain positioning accuracy but thin enough to minimize mass. The movable component and fixed component are designed as thin structural elements that provide necessary mechanical support while keeping the overall weight low, achieving a favorable strength-to-weight ratio in the miniaturized module.
4Adaptability or versatility
If conventional adjustable aperture modules are used, then the aperture control functionality is provided, but the device complexity and difficulty of integration increase in compact modules
Solution Approach 1:
The blade assembly, fixed component, movable component, and driving mechanism are integrated into a single compact unit that can be directly mounted in the optical path of compact camera modules. This merged design eliminates the need for separate aperture control mechanisms and reduces the number of assembly steps, simplifying integration while maintaining full aperture control functionality.
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
Enables miniaturization of the aperture module while maintaining sufficient magnetic driving force, improving operational quality and precision, thus addressing the limitations of conventional designs in compact camera modules.
Implementation Method 1
the driving mechanism includes at least one coil assembly and at least one magnet... The at least one magnet is disposed on the movable component, and the at least one magnet includes at least one magnetic pole
Implementation Method 2
an adjustable aperture module includes one of the aforementioned adjustable aperture modules and at least one Hall sensor... The at least one Hall sensor faces the second magnetic pole and configured to detect changes in a magnetic field around the second magnetic pole
Data Source
AI summary
An adjustable aperture module includes a blade assembly, a fixed component connected to the blade assembly, a movable component connected to the blade assembly, and a driving mechanism. The blade assembly includes light-blocking blades overlapping one another in a circumferential direction surrounding a central axis and together forming a light pass aperture. The movable component is disposed corresponding to the fixed component. The driving mechanism is configured to rotate the movable component in the circumferential direction relative to the fixed component. The driving mechanism includes at least one coil assembly and at least one magnet arranged along the circumferential direction. The coil assembly includes at least two coils. The magnet is disposed on the movable component and includes at least one magnetic pole. The magnetic pole is disposed corresponding to the coil assembly and facing at least two coils of the coil assembly.