Mirror-Tilt OIS Actuator for Ultra-Small Camera Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional OIS technologies face challenges in implementing optical image stabilization in ultra-small camera modules due to space constraints, leading to issues such as decentering, tilting, magnetic interference, and increased power consumption, which affect image quality and resolution.
Innovation Solution
An actuator device with a reflective member that tilts to stabilize the lens assembly, utilizing a housing, holder, moving plate, rigid mover, and damper to minimize decentering and tilting, and incorporates magnets and coils for precise movement control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional OIS technologies are implemented in ultra-small camera modules, then space constraints are addressed, but decentering and tilting occur leading to degraded image quality
Solution Approach 1:
The camera module is divided into separate functional components: a lens assembly that can be independently positioned and a reflective member that handles stabilization. This segmentation allows the lens assembly to be precisely mounted while the OIS function is implemented through the reflective member's tilting mechanism, preventing decentering and tilting of the lens itself.
Solution Approach 2:
A reflective member (mirror) is introduced as an intermediary component between the light source and the lens assembly. This reflective member performs the OIS function by tilting to correct image shake, while the lens assembly remains stationary and properly aligned, thus avoiding decentering and tilting issues that would occur if the lens itself were moved.
2Measurement precision
If magnets and coils are used for OIS actuation, then precise movement control is achieved, but magnetic interference occurs affecting image quality
Solution Approach 1:
The magnetic actuation system (magnets and coils) is extracted and positioned specifically for controlling the reflective member's tilting motion, separate from the lens assembly. This extraction ensures that magnetic fields are confined to the reflective member actuation zone and do not interfere with the lens or image sensor, eliminating magnetic interference while maintaining precise movement control where needed.
3Force
If friction torque is reduced by increasing separation distance, then driving force improves, but lens decentering and tilting are deepened
Solution Approach 1:
The reflective member serves as an intermediary that decouples the actuation mechanism from the lens assembly. By placing the magnets and coils to actuate the reflective member rather than the lens directly, sufficient separation distance can be maintained to reduce friction torque and improve driving force, while the lens assembly remains securely positioned without experiencing decentering or tilting.
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 actuator device ensures stable driving performance and improved optical characteristics by minimizing decentering and tilting, enhancing image quality and resolution in ultra-small camera modules.
Implementation Method 1
a damper coupled to the rigid mover
Implementation Method 2
OIS technology is a technology that corrects motion by changing the path of light
Implementation Method 3
incorporates magnets and coils for precise movement control
Data Source
AI summary
A first embodiment of the present invention relates to an actuator device comprising: a housing; a holder disposed inside the housing; a reflective member disposed on the holder; a moving plate disposed between the housing and the holder; a rigid mover coupled to the holder; and a damper coupled to the rigid mover, wherein the rigid mover comprises a protruding portion coupled to the housing by the damper.