Multi-Axis Camera Module Lens Stabilization
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Solution Overview
Problem
Camera modules with optical image stabilization face issues where excessive movement of the lens module can cause collisions with the housing, leading to damage and noise due to external impacts or user shaking.
Innovation Solution
A camera module design that includes a lens module, movable members, and driving units with magnets and coils to rotate the lens module around multiple axes, reducing movement in directions that could collide with the housing, thereby minimizing damage and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lens module is made movable to correct shaking due to external impacts, then optical image stabilization is improved, but the risk of collision with housing and damage increases
Solution Approach 1:
The movable member is divided into a first movable member and a second movable member that can rotate about different axes intersecting the optical axis. This segmentation allows independent control of movement in different directions, enabling the lens module to correct shaking while avoiding collision with the housing by precisely controlling movement trajectories.
Solution Approach 2:
The patent introduces movement in multiple dimensions by allowing rotation about multiple axes (first axis and second axis intersecting the optical axis). This multi-dimensional movement capability enables the lens module to counteract shaking in various directions while maintaining control over its position to avoid housing collision.
2Reliability
If driving force is applied to move the lens module for image stabilization, then shaking correction is improved, but noise generation due to collision increases
Solution Approach 1:
The driving units (first driving unit and second driving unit with driving magnets and coils) provide controlled driving force based on detected shaking, enabling the lens module to correct shaking while minimizing unnecessary movement that could cause collision and noise. The feedback mechanism allows precise control of movement magnitude and direction.
3Reliability
If the lens module is allowed to move freely to correct shaking, then image stabilization performance is improved, but the complexity of the driving system increases
Solution Approach 1:
The patent combines the first movable member and second movable member into a unified movable structure that can be controlled by two driving units. This merging approach allows the system to achieve multi-axis rotation capability while managing complexity through integrated design of the movable members and their supporting structures.
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 camera module effectively performs optical image stabilization by rotating the lens module around multiple axes, reducing collisions and noise, and enhancing durability against external impacts.
Implementation Method 1
The first driving unit, configured to provide a first driving force required to rotate the first movable member, includes a first driving magnet disposed on the first movable member. The first driving unit may further include a first driving coil disposed on one side of the housing to face the first driving magnet.
Implementation Method 2
The second driving unit, configured to provide a second driving force required to rotate the second movable member, includes a second driving magnet disposed on the second movable member. The second driving unit may further include a second driving coil disposed on another side of the housing to face the second driving magnet.
Implementation Method 3
The first movable member is coupled to the lens module and configured to rotate about a first axis intersecting an optical axis of the lens module. The second movable member, supporting the first movable member, is configured to rotate about a second axis intersecting the optical axis.
Data Source
AI summary
A camera module includes a lens module, a first movable member, a second movable member, a fixed member, a first driving unit, and a second driving unit. The first movable member is coupled to the lens module and configured to rotate about a first axis virtually intersecting an optical axis of the lens module. The second movable member, supporting the first movable member, is configured to rotate about a second axis virtually intersecting the optical axis. The fixed member is configured to support the second movable member. The first driving unit, configured to provide a first driving force required to rotate the first movable member, includes a first driving magnet disposed on the first movable member. The second driving unit, configured to provide a second driving force required to rotate the second movable member, includes a second driving magnet disposed on the second movable member.