Reflective Mirror Drive Layout for Clean Hall Feedback in OIS
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Solution Overview
Problem
Existing camera devices face challenges in implementing optical image stabilization (OIS) functions effectively, particularly in minimizing size and improving Hall output for feedback control while suppressing noise and simplifying assembly.
Innovation Solution
A reflective member driving device is designed with a housing, holder, moving plate, driving and sensing magnets, coils, and sensors, allowing tilting of the reflective member about two perpendicular axes, with optimized magnet and sensor placement for improved Hall output and noise suppression, and simplified assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the sensing magnet is disposed close to the coil for electromagnetic interaction, then the driving force is improved, but the Hall output for feedback control deteriorates due to electromagnetic interference
Solution Approach 1:
The patent divides the magnetic system into two separate magnet assemblies: a driving magnet assembly that interacts with the coil to generate driving force, and a sensing magnet assembly that is spatially separated to provide Hall sensor feedback without electromagnetic interference. This segmentation allows independent optimization of driving performance and measurement accuracy.
Solution Approach 2:
The sensing magnet is extracted from the coil interaction zone and positioned at a location where it does not electromagnetically interact with the coil. This extraction eliminates the harmful electromagnetic interference from the Hall sensor measurements while preserving the driving function.
2Reliability
If multiple magnets and sensors are added to achieve tilting about two perpendicular axes, then the OIS function is improved, but the device complexity increases
Solution Approach 1:
The holder structure serves multiple functions: it supports the reflective member, accommodates both driving and sensing magnets, provides mounting positions for coils and sensors, and enables tilting about two perpendicular axes. This multi-functionality reduces the need for additional structural components.
Solution Approach 2:
The patent combines the driving and sensing magnetic systems into a single integrated holder assembly, where both magnet assemblies are mounted on the same holder. This merging approach consolidates multiple functions into a single structural unit, reducing overall device complexity.
3Volume of moving object
If the device size is minimized for compact camera modules, then the adaptability is improved, but the Hall output signal strength deteriorates
Solution Approach 1:
The sensing magnet is positioned at a specific location optimized for Hall sensor detection, with its orientation and distance carefully controlled to maximize signal strength within the compact device volume. This local optimization ensures adequate signal strength without increasing overall device size.
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 enhances Hall output for feedback control, suppresses noise, minimizes device size, simplifies assembly, and improves tuning for current control, leading to better OIS performance and increased yield.
Implementation Method 1
a coil which electromagnetically interacts with the driving magnet
Implementation Method 2
a first sensor which senses the sensing magnet
Data Source
AI summary
A reflective member driving device including a housing; a holder which is disposed within the housing; a reflective member which is disposed in the holder; a moving plate which is disposed between the housing and the holder; a driving magnet and a sensing magnet which are disposed in the holder; a coil which electromagnetically interacts with the driving magnet; and a first sensor which senses the sensing magnet. The driving magnet includes a first magnet which tilts the reflective member about a first axis and a second magnet which tilts the reflective member about a second axis perpendicular to the first axis. The sensing magnet is disposed at a location where the sensing magnet does not electromagnetically interact with the coil.