Optical Element Driving Mechanism for Autofocus and Image Stabilization
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Solution Overview
Problem
Existing optical element driving mechanisms face challenges in achieving effective displacement-correction and shake-compensation, leading to blurry images and videos, especially in electronic devices like smartphones and tablets, due to lack of efficient autofocus and optical image stabilization systems.
Innovation Solution
The optical element driving mechanism incorporates a unique design with a fixed and movable part, a sensing assembly, and a driving assembly that includes coils and magnetic elements, allowing for closed-loop feedback and miniaturization, enabling both autofocus and optical image stabilization with a single set of magnetic elements, thereby reducing volume and improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If separate magnetic elements are used for autofocus and optical image stabilization, then driving force is sufficient, but the mechanism volume increases
Solution Approach 1:
The patent applies multi-functionality by enabling a single set of magnetic elements to serve dual purposes: driving autofocus movement along the optical axis and driving optical image stabilization movement perpendicular to the optical axis. The coil assembly can independently control magnetic elements to achieve both AF and OIS functions, eliminating the need for separate magnetic element sets and reducing overall mechanism volume.
Solution Approach 2:
The patent merges the autofocus and optical image stabilization driving systems by combining the magnetic elements into a single integrated set. The coil assembly generates magnetic fields that can simultaneously or independently actuate the same magnetic elements for different functions, consolidating what would traditionally require separate component sets into one unified system.
2Stability of the object's composition
If magnetic elements are disposed on all sides of the fixed part, then driving symmetry is improved, but the device complexity increases
Solution Approach 1:
The patent applies asymmetry by strategically placing magnetic elements only on specific sides of the fixed part rather than uniformly on all sides. The coil assembly is configured to generate magnetic fields that can effectively actuate the asymmetrically positioned magnetic elements for both autofocus and optical image stabilization, achieving functional symmetry without physical symmetry in the component layout.
3Volume of moving object
If a single set of magnetic elements is shared for both autofocus and optical image stabilization, then volume is reduced, but the sensing assembly configuration becomes more critical
Solution Approach 1:
The patent implements feedback by incorporating a sensing assembly that detects the position of the movable part relative to the fixed part and provides closed-loop feedback to the control system. The sensing element and reference element work together to accurately measure displacement, enabling the controller to precisely manage the shared magnetic elements for both autofocus and optical image stabilization functions.
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 solution effectively achieves autofocus and optical image stabilization, enhancing image quality by compensating for shocks and vibrations, and reducing the mechanism's size, thus addressing the issue of blurry images and videos.
Implementation Method 1
The first driving assembly includes two coils disposed on opposite sides of the movable part. A winding axis of each of the two coils is perpendicular to the main axis. The first driving assembly further includes a plurality of magnetic elements.
Implementation Method 2
The sensing assembly includes a reference element and a sensing element. The sensing element senses a movement of the reference element in order to sense a movement of the holder relative to the frame.
Data Source
AI summary
An optical element driving mechanism is provided. The optical element driving mechanism with a main axis includes a fixed part, a movable part, a first driving assembly, and a sensing assembly. The movable part moves relative to the fixed part. The movable part and the fixed part are arranged along the main axis. The movable part includes a frame and a holder. The holder moves relative to the frame. The first driving assembly drives the holder to move. The sensing assembly includes a reference element and a sensing element. The sensing element senses a movement of the reference element in order to sense a movement of the holder relative to the frame.