Dual-Speed OIS Actuator for Camera Module Image Stabilization
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Solution Overview
Problem
Existing camera modules face challenges in maintaining image stabilization and reducing pixel shake, especially at small field of view, due to spatial restrictions and limitations in increasing lens size for ultra-slim and high-resolution devices.
Innovation Solution
A camera module design incorporating a fixed and moving part with distinct driving mechanisms, where a first driving part moves the moving part at a first maximum speed and a second driving part moves it at a higher second maximum speed, perpendicular to the optical axis, to compensate for shaking angles and angles caused by the first driving part, allowing for improved stabilization without increasing the overall device size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of pixels of the image sensor is increased to improve resolution, then the resolution increases, but the pixel size decreases and the amount of light received by each pixel decreases, causing image shake to occur more severely in dark environments
Solution Approach 1:
The patent divides the OIS function into two independent driving parts: a first driving part for primary stabilization and a second driving part for secondary correction. This segmentation allows each part to specialize in specific stabilization tasks, improving overall effectiveness without increasing the physical size of the camera module, thereby enabling high-resolution sensors without compromising image quality in low-light conditions.
Solution Approach 2:
The patent employs dynamic control of the lens assembly by coordinating two driving parts with different maximum speeds. The first driving part handles large-amplitude shake correction while the second driving part corrects residual movements. This dynamic, multi-stage correction system adapts to various shaking conditions, maintaining image quality across different lighting conditions and focal lengths.
2Illumination intensity
If the lens size is increased to increase the amount of received light, then the amount of received light increases, but the space for the actuator for OIS is reduced, making it difficult to secure sufficient space for the lens to tilt or move
Solution Approach 1:
The patent segments the OIS actuator function into two independent driving parts with different speed characteristics. The first driving part provides primary stabilization with lower speed requirements, while the second driving part provides fine correction with higher speed. This functional segmentation allows each actuator to be smaller, enabling the use of a larger lens without compromising OIS performance or increasing the overall module volume.
Solution Approach 2:
The patent changes the speed parameters of the driving parts to optimize space utilization. By having the first driving part operate at lower maximum speed and the second at higher maximum speed, the system achieves effective OIS with smaller actuators. This parameter optimization allows the lens to be larger for improved light collection while maintaining sufficient stabilization capability within the constrained space.
3Reliability
If the lens is tilted or moved for OIS, then image stabilization is achieved, but the suppression ratio changes according to the field of view, reducing stabilization effectiveness at small field of view
Solution Approach 1:
The patent segments the stabilization function into two coordinated driving parts that work together across different field of view conditions. The first driving part handles primary stabilization for wide-angle shots, while the second driving part provides correction for telephoto shots. This segmentation enables the system to maintain consistent suppression ratios across varying field of view without requiring a single oversized actuator.
Solution Approach 2:
The patent employs dynamic coordination between two driving parts with different speed characteristics to adapt to changing field of view conditions. The controller dynamically adjusts the operation of both driving parts based on the focal length and shaking conditions, ensuring optimal stabilization performance across all field of view ranges. This dynamic approach maintains suppression ratio consistency while using smaller actuators.
Data Source
AI summary
An embodiment of the present invention provides a camera module comprising: a fixed part; a moving part which moves relative to the fixed part in an optical axis direction; a first driving part which moves the moving part at a first maximum speed; and a second driving part which moves the moving part at a second maximum speed, wherein the first driving part and the second driving part move the moving part in a direction perpendicular to the optical axis direction, and the second maximum speed is greater than the first maximum speed.