Sensor-Shift OIS Actuator for Heavy Lens Camera Modules
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Solution Overview
Problem
The increasing weight of lens modules in camera modules complicates precise control of driving forces for image stabilization, making it difficult to achieve effective optical image stabilization.
Innovation Solution
An optical image stabilization actuator design featuring a sensor substrate, a fixed frame, a movable frame, and a driver system with magnetic components and guide grooves, allowing the image sensor to move perpendicular to the optical axis for stabilization, reducing the need to move the heavier lens module.
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 precise control of driving force for image stabilization becomes difficult
Solution Approach 1:
Instead of moving the heavy lens module for image stabilization, this patent inverts the approach by moving the image sensor in the opposite direction. The image sensor is mounted on a movable frame that can shift perpendicular to the optical axis, while the lens module remains stationary, thereby achieving stabilization without the burden of moving large masses.
Solution Approach 2:
The camera module is segmented into fixed and movable components. The lens module is kept fixed while the image sensor is separated and mounted on an independently controllable movable frame. This segmentation allows the lighter image sensor to be moved precisely for stabilization while the heavier lens remains stationary.
2Measurement precision
If the lens module weight is increased to improve camera performance, then image quality is improved, but the driving force requirements increase
Solution Approach 1:
The patent inverts the traditional stabilization approach by moving the image sensor instead of the lens module. Since the image sensor has significantly less mass than the lens assembly, the driving force required to achieve the same stabilization effect is substantially reduced, while still maintaining image quality.
Solution Approach 2:
The movable frame structure provides a counterbalancing mechanism that reduces the effective weight that the driver must overcome. The frame is designed to accommodate the image sensor and provide mechanical support that minimizes the force required for precise positioning during stabilization operations.
3Reliability
If the lens module is moved for image stabilization, then shaking correction is achieved, but the system complexity increases
Solution Approach 1:
Rather than moving the complex lens module assembly with multiple elements and mounting structures, the patent moves only the image sensor on a simpler movable frame. This inversion simplifies the mechanical system while achieving the same shaking correction function.
Solution Approach 2:
The stabilization function is extracted from the lens module and assigned to a separate image sensor mounting system. This allows the lens module to remain simple and focused on its primary function of light gathering, while the movable frame handles stabilization, reducing overall system complexity.
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
This design enables precise optical image stabilization with reduced driving force requirements, improving stabilization performance while maintaining camera module stability and reducing the risk of external shocks.
Implementation Method 1
a first ball member disposed between the fixed frame and the movable frame, and configured to support a movement of the movable frame
Implementation Method 2
a plurality of magnetic materials disposed on the fixed frame, and configured to generate an attractive force with respect to the first driver disposed on the movable frame
Implementation Method 3
Guide grooves may be disposed on a surface of the fixed frame and a surface of the movable frame which oppose each other in a direction perpendicular to the imaging plane
Data Source
AI summary
An optical image stabilization actuator is provided. The optical image stabilization actuator includes a sensor substrate on which an image sensor having an imaging plane is disposed; a fixed frame configured to accommodate the sensor substrate; a movable frame accommodated in the fixed frame and configured to move in a direction parallel to the imaging plane; a first ball member disposed between the fixed frame and the movable frame and configured to support movement of the movable frame; and a first driver disposed on the movable frame and the fixed frame and configured to provide driving force to the movable frame, wherein the sensor substrate includes a movable portion coupled to the movable frame, a fixed portion coupled to the fixed frame, and a plurality of bridges configured to movably support the movable portion.