Optical Image Stabilization Mechanism Using Nested Magnets
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Solution Overview
Problem
Conventional optical image stabilization devices are difficult to miniaturize due to the large dimensions of coils and magnets, which limits their integration in compact devices like cameras and mobile phones, and they struggle to efficiently correct image blur caused by vibrations.
Innovation Solution
An optical image stabilization mechanism that includes a holder, frame, base, coils, and magnetic elements, where the frame is movably connected to the holder and base, and displacement sensors detect relative displacement to correct the optical axis, using electromagnetic induction to stabilize the image, with the integration of multi-polar permanent magnets to reduce size and production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional coils and magnets are used in optical image stabilization devices, then electromagnetic induction can occur to correct optical axis deviation, but the device dimensions become large and miniaturization becomes difficult
Solution Approach 1:
The patent embeds the magnetic elements within the holder structure and positions them in close proximity to the coils, creating a nested arrangement where magnetic components are integrated into the existing mechanical framework rather than being separate external components. This nesting approach reduces the overall device volume while maintaining the electromagnetic induction function for optical axis correction.
Solution Approach 2:
The patent utilizes the Z-axis (optical axis direction) to position magnetic elements and coils in a stacked configuration rather than spreading them out in the X-Y plane. By arranging the electromagnetic components along the optical axis dimension, the patent reduces the lateral footprint of the device while maintaining sufficient separation for functional operation, enabling miniaturization in compact devices.
2Reliability
If larger coils and magnets are used to ensure sufficient electromagnetic induction effect, then image stabilization performance improves, but the device becomes more complex and harder to manufacture
Solution Approach 1:
The patent combines multiple functional components into integrated assemblies. The magnetic elements are positioned to serve both the image stabilization function (through electromagnetic induction with coils) and the autofocus function (through interaction with drive coils). This merging of functions reduces the total number of separate components and simplifies the manufacturing process while maintaining adequate stabilization performance.
Solution Approach 2:
The patent optimizes the parameters of the electromagnetic components, such as the magnetic strength of the magnetic elements and the turn density of the coils, to achieve sufficient electromagnetic induction effect with smaller, more manageable component sizes. By carefully tuning these parameters, the patent maintains image stabilization performance while reducing component dimensions and assembly complexity.
3Measurement precision
If multiple displacement sensors are added to detect optical axis deviation in both X and Y directions, then correction accuracy improves, but device complexity and power consumption increase
Solution Approach 1:
The patent designs the displacement sensors to serve multiple functions: they detect optical axis deviation for image stabilization, and they also provide position feedback for autofocus operation. This multi-functionality allows the system to achieve accurate optical axis detection without adding dedicated sensors solely for stabilization, thereby reducing overall system complexity while maintaining measurement precision.
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 mechanism effectively corrects optical axis deviations along the X and Y axes, suppressing image blur and enabling miniaturization while reducing power consumption and production costs, thus improving image quality in compact devices.
Implementation Method 1
The displacement sensor is disposed on the base to detect relative displacement between the lens and the base
Implementation Method 2
When the autofocus function is executed, a current is applied to the coil, and electromagnetic induction occurs between the coil and the magnet, so that the holder moves with respect to the base along the optical axis of the optical system
Data Source
AI summary
An optical image stabilization mechanism is provided, including a holder for holding a lens, a frame, a base, a first coil, a second coil, a displacement sensor, a first magnetic element, a second magnetic element, and a third magnetic element. The frame is movably connected to the holder and the base. The first coil is disposed on a side of the holder. The second coil is disposed on the base. The first and second magnetic elements are disposed on the frame and correspond to the first coil. The magnetic pole direction of the first magnetic element is opposite to that of the second magnetic element. The third magnetic element is disposed on the frame and corresponds to the second coil. The displacement sensor is disposed on the base to detect relative displacement between the lens and the base.