OIS Actuator Layout for Precise Sensor Shift in Heavier Camera Modules
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Solution Overview
Problem
The increasing weight of lens modules in camera modules makes it difficult to precisely control the driving force for optical image stabilization, affecting the performance of autofocus and optical image stabilization functions.
Innovation Solution
A camera module design featuring a movable frame with dual sub-driving units, each comprising magnets and coils, generating perpendicular driving forces to move the image sensor in multiple directions, allowing precise optical image stabilization without increasing the module's height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the lens module weight is increased to improve camera performance, then image quality is improved, but the driving force control precision for optical image stabilization deteriorates
Solution Approach 1:
The patent replaces the traditional mechanical driving system with an electromagnetic driving system. Instead of using motors or mechanical actuators to move the lens module for optical image stabilization, the invention uses electromagnetic forces generated by coils and magnets to achieve precise positioning. This substitution allows for better control precision despite the increased weight of the lens module, as electromagnetic systems can provide more precise force control compared to mechanical systems.
2Manufacturing precision
If dual sub-driving units are added to move the image sensor in multiple directions, then optical image stabilization accuracy is improved, but device complexity increases
Solution Approach 1:
The patent merges the functions of multiple driving units into a single integrated electromagnetic driving system. Instead of using separate mechanical actuators for different movement directions, the invention combines multiple coil assemblies that can generate forces in multiple directions (X-axis, Y-axis, and Z-axis) within a unified structure. This merging reduces the overall structural complexity while maintaining the capability to move the image sensor in multiple directions for comprehensive optical image stabilization.
Solution Approach 2:
The electromagnetic driving units are designed with multi-functionality, where the same coil and magnet assembly can generate driving forces in multiple directions by controlling the current direction and magnitude. This universal design allows a single driving unit structure to perform what would traditionally require multiple specialized actuators, thereby reducing device complexity while achieving high stabilization accuracy.
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
Enhances the accuracy of optical image stabilization by moving the image sensor in multiple directions, reducing the required driving force and maintaining stability during image capture.
Implementation Method 1
a first sub-driving unit including a first magnet disposed on the fixed frame and a first coil disposed to face the first magnet; and a second sub-driving unit including a second magnet disposed on the fixed frame and a second coil disposed to face the second magnet
Data Source
AI summary
An actuator for optical image stabilization includes a fixed frame having an internal space, a movable frame disposed in the fixed frame and configured to be movable relative to the fixed frame, a first driving unit configured to apply a driving force to the movable frame, and a sensor substrate including a moving portion coupled to the movable frame, wherein an image sensor is disposed on the sensor substrate, the first driving unit includes a first sub-driving unit including a first magnet disposed on the fixed frame and a first coil disposed to face the first magnet, and a second sub-driving unit including a second magnet disposed on the fixed frame and a second coil disposed to face the second magnet, and a portion of the first magnet overlaps a portion of the second magnet in a direction perpendicular to an imaging surface of the image sensor.