Camera Lens Module Compact Image Stabilization
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Solution Overview
Problem
Camera lens modules in portable devices face challenges in achieving stable and accurate image stabilization with a compact design, as existing solutions often result in reduced accuracy and speed due to the need for larger spaces and complex configurations, leading to potential movement beyond the stabilization range and unnecessary rotation.
Innovation Solution
The camera lens module incorporates an image stabilization carrier and an automatic focus carrier with a rolling unit and separate yokes corresponding to image stabilization magnets, allowing for compact design and precise stabilization by utilizing available space effectively, suppressing malfunctions and rotations, and enabling alignment of the optical axis without a cumbersome process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If four magnetic circuits are applied to face each other in two directions for optical image stabilization, then the mover can be moved in X-axis and Y-axis directions to make correction, but a sufficient space is required which results in increased size and complicated configuration of the camera module
Solution Approach 1:
The patent combines multiple magnetic circuits into a single integrated magnetic circuit structure. The magnetic circuit includes a yoke with first and second magnetic bodies disposed at opposite positions, allowing the generation of electromagnetic forces in multiple directions (X-axis and Y-axis) through a unified structure rather than separate facing magnetic circuits, thereby reducing complexity while maintaining stabilization accuracy
Solution Approach 2:
The single magnetic circuit is designed to perform multiple functions: it can generate electromagnetic forces in both X-axis and Y-axis directions by controlling current flow through different coil windings. The first and second magnetic bodies can independently or simultaneously generate forces, allowing the same magnetic circuit structure to replace what would traditionally require four separate magnetic circuits
2Volume of moving object
If the camera module is designed smaller by reducing the size of the mover or decreasing the number of components, then the size is reduced, but the optical image stabilization function may have deteriorated accuracy and speed
Solution Approach 1:
The patent optimizes parameters of the magnetic circuit including the arrangement of magnetic bodies, coil windings, and yoke structure to achieve high electromagnetic force density in a compact volume. By carefully designing the magnetic path and magnetic field distribution, the system maintains strong stabilization forces despite the reduced size of the mover and overall module
Solution Approach 2:
The magnetic circuit is segmented into functional regions with first and second magnetic bodies at opposite positions, each capable of independent force generation. This segmentation allows efficient utilization of space within the compact mover while maintaining the capability to generate forces in multiple directions for accurate image stabilization
3Reliability
If the optical image stabilization function is performed using a resultant force of forces applied in two directions, then correction is achieved, but the mover may move beyond its movement range or generate an unnecessary rotation
Solution Approach 1:
The patent incorporates a detection unit that detects the position of the mover and provides feedback to the control unit. The control unit uses this feedback information to adjust the electromagnetic forces generated by the magnetic circuit, ensuring that the mover remains within its operational range and prevents unnecessary rotation while maintaining accurate correction
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 configuration allows for a compact camera lens module with enhanced accuracy and precision in image stabilization, preventing excessive movement and rotation, while maintaining both small product design and improved functionality, and simplifies the optical axis alignment process.
Implementation Method 1
a moving part (a mover) makes a plane movement with respect to a fixed part (a stator) by using an electromagnetic force generated by the magnetic circuit to perform correction against shaking
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A camera lens module according to an embodiment of the present invention comprises: an image stabilization carrier containing a lens barrel; an automatic focus carrier loaded with the image stabilization carrier; a rolling unit for supporting a planar movement, which is perpendicular to an optical axis, of the image stabilization carrier with regard to the automatic focus carrier; a base containing the automatic focus carrier, which is loaded with the image stabilization carrier, such that the same can move forward/backward in the direction of the optical axis; an image stabilization driving unit; and an automatic focus driving unit.