Camera Module Suspension Wire Damping for Image Stabilization
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Solution Overview
Problem
Image stabilization in camera modules of mobile communications terminals is hindered by resonance phenomena and rotational motions due to frequency mismatches between the driving force of the OIS actuator and the natural frequency of the lens module and suspension wires, leading to deteriorated image quality.
Innovation Solution
Incorporation of a damper part, specifically a viscous gel, to enclose a portion of the suspension wire, which is disposed between the fixed and driving parts, preventing resonance and rotational motions by generating frictional resistance and stabilizing the suspension wire's movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If suspension wires are used to support the lens module for image stabilization, then the lens module can be moved perpendicular to the optical axis, but resonance phenomena occur when the driving force frequency coincides with the natural frequency of the lens module and suspension wire
Solution Approach 1:
A damper part is introduced as an intermediary element between the suspension wire and the lens module. This damper part absorbs and dissipates vibrational energy, preventing resonance from propagating to the lens module while still allowing the suspension wire to perform its image stabilization function.
Solution Approach 2:
The damper part converts the harmful resonance vibrations into beneficial dampened movements. By strategically placing the damper part at specific locations along the suspension wire, the harmful resonant energy is transformed into controlled, dampened motion that stabilizes the lens module rather than destabilizing it.
2Reliability
If the driving force of the OIS actuator is applied to a position spaced from the center of the lens module, then image stabilization can be achieved, but a rolling moment is generated causing the lens module to rotate
Solution Approach 1:
The damper part acts as a mediator between the off-center driving force and the lens module. It provides rotational damping that counteracts the rolling moment generated by the off-center force application, preventing unwanted lens module rotation while maintaining the image stabilization effect.
Solution Approach 2:
The damper part changes the dynamic parameters of the lens module-suspension system by introducing rotational damping. This modifies the system's response to off-center forces, transforming the harmful rolling moment into controlled, dampened rotational motion that maintains lens module orientation stability.
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 damper part effectively dampens vibrations of the suspension wire, preventing resonance and rotational motions, thereby enhancing image stabilization and maintaining image quality even during slight movements of the terminal.
Implementation Method 1
preventing resonance and rotational motions by generating frictional resistance and stabilizing the suspension wire's movement
Implementation Method 2
The damper part effectively dampens vibrations of the suspension wire, preventing resonance and rotational motions
Data Source
AI summary
A camera module includes: a driving part comprising a lens module; a fixed part spaced apart from the driving part; a suspension wire having a first end fixed to the fixed part and a second end fixed to the driving part; and a damper part enclosing at least a portion of the suspension wire.