Reflective Mirror Actuator Layout for Compact OIS Alignment
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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
1Force
If the separation distance is increased to reduce friction torque, then friction torque resistance decreases, but lens decentering and tilting are deepened
Solution Approach 1:
The patent introduces a tilt adjustment mechanism that operates in a different dimensional space (angular/rotational dimension) rather than linear separation. By adjusting the tilt angle of the lens assembly independently from its separation distance, the system can optimize friction torque reduction while maintaining precise alignment through angular compensation rather than linear displacement.
Solution Approach 2:
The patent changes the control parameters from purely linear separation distance to a combination of separation distance and tilt angle. This parameter transformation allows independent optimization of friction torque (through separation) and alignment precision (through tilt angle adjustment), resolving the contradiction between these two requirements.
2Volume of moving object
If conventional OIS technology is used in ultra-small camera modules, then space constraints are addressed, but decentering, tilting, magnetic interference, and power consumption increase
Solution Approach 1:
The patent replaces conventional mechanical OIS systems with a reflective member-based optical stabilization system. Instead of mechanically moving the entire lens assembly, the system uses a reflective member that tilts to redirect light, achieving stabilization through optical path adjustment rather than mechanical displacement. This substitution eliminates magnetic interference, reduces power consumption, and maintains alignment precision in ultra-small form factors.
Solution Approach 2:
The patent extracts the stabilization function from the mechanical lens assembly and implements it separately through a reflective member. This separation allows the main lens assembly to remain compact and stable while the reflective member handles the stabilization function independently, avoiding the negative effects of conventional OIS on image quality and alignment.
3Manufacturing precision
If lens movement is used for OIS correction, then image sensor alignment is improved, but friction torque and power consumption increase
Solution Approach 1:
The patent substitutes mechanical lens movement with optical path redirection using a tilting reflective member. The reflective member rotates or tilts to change the light path angle, achieving the same alignment correction effect without moving the lens assembly. This eliminates friction torque entirely and significantly reduces power consumption since only a small reflective component needs to be actuated rather than the entire lens assembly.
4Manufacturing precision
If multiple zoom lens groups are used to improve optical characteristics, then image quality is enhanced, but alignment precision between lens groups and image sensor becomes more critical
Solution Approach 1:
The patent implements a universal tilt adjustment mechanism that can compensate for alignment errors across multiple lens groups simultaneously. Rather than requiring separate precise alignment for each lens group, the reflective member's tilt adjustment provides a unified correction that addresses alignment issues for the entire optical system, including all lens groups and the image sensor. This multi-functional approach maintains optical characteristics while reducing the criticality of individual alignment precision.
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 while reducing power consumption.
Implementation Method 1
a damper coupled to the rigid mover
Implementation Method 2
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.