Camera Module Motor Layout for Large-Stroke Image Stabilization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional voice coil motors (VCM) face challenges in implementing large-stroke optical image stabilization, leading to poor image quality and user experience in certain application scenarios.
Innovation Solution
A motor design featuring a base, image stabilization bracket, and coils/magnetic pieces arranged to allow large-stroke optical image stabilization without increasing height, utilizing a guide bracket for precise guiding and minimizing magnetic gap interference, and incorporating a focusing mechanism for decoupled movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a conventional voice coil motor (VCM) is used for optical image stabilization, then the structure is simple and easy to manufacture, but the stroke is limited and cannot achieve large-stroke stabilization
Solution Approach 1:
The motor is divided into independent functional modules: a stationary base with coils, a movable image stabilization bracket with magnetic pieces, and a guide bracket for precision guidance. This segmentation allows each module to be optimized independently, achieving large stroke capability while maintaining manufacturing simplicity.
Solution Approach 2:
The design transitions from a conventional single-axis VCM to a two-dimensional movement system with the image stabilization bracket that can move along both first and second directions perpendicular to each other. This dimensional expansion enables larger stabilization stroke while keeping individual component structures simple.
2Length of moving object
If the image stabilization bracket moves with large amplitude, then the stabilization effect is improved, but the magnetic gap changes causing driving force to decrease
Solution Approach 1:
The magnetic pieces are arranged in a configuration where their polarity directions are perpendicular to the winding planes of the coils. This spatial arrangement ensures that the magnetic gap between coils and magnetic pieces remains constant during large-amplitude movements in the first and second directions, maintaining stable driving force throughout the full stroke range.
3Length of moving object
If the motor height is increased to accommodate large-stroke components, then the stabilization stroke is improved, but the overall device size increases
Solution Approach 1:
The design achieves large stabilization stroke through horizontal movement of the image stabilization bracket along the first and second directions, rather than increasing vertical height. The guide bracket constrains movement to these horizontal planes, enabling large stroke capability while maintaining a compact vertical profile.
Solution Approach 2:
The guide bracket provides dynamic guidance that allows the image stabilization bracket to move freely within the desired large stroke range along the first and second directions, while maintaining precise positional control. This dynamic constraint system enables large movement without requiring additional vertical space.
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 stable and precise large-stroke optical image stabilization with minimal resistance, ensuring high image quality and compact size, enhancing user experience.
Implementation Method 1
The first image stabilization coil is disposed facing the first image stabilization magnetic piece and is configured to drive the image stabilization bracket to move relative to the base along a first direction. The second image stabilization coil is disposed facing the second image stabilization magnetic piece and is configured to drive the image stabilization bracket to move relative to the base along a second direction.
Data Source
AI summary
A motor, camera module and device having a base, an image stabilization bracket, a first image stabilization magnetic piece, a second image stabilization magnetic piece, a first image stabilization coil, a second image stabilization coil, and a guide bracket having an L-shape. The first image stabilization magnetic piece is fastened to a first edge portion of the image stabilization bracket, and the second image stabilization magnetic piece is fastened to a second edge portion of the image stabilization bracket. The image stabilization bracket, and the first and second image stabilization coils are fastened to the base. Three support portions of the guide bracket are all located between the image stabilization bracket and the base, are disposed in a one-to-one correspondence with three corner portions of the image stabilization bracket, and are connected to the base and the image stabilization bracket through support pieces.