Tri-axis Feedback Control for Electromagnetic Lens Driving
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Solution Overview
Problem
Conventional camera systems employ separate and independent control circuits for auto-focus and optical image stabilization modules, leading to slower and delayed focusing operations due to the lack of integrated feedback control, making it difficult to integrate feedback circuits for precise tri-axis control.
Innovation Solution
A tri-axis close-loop feedback controlling module using a 6-pin Hall element, where two pins drive the auto-focus module along the Z-axis and four pins receive control signals from a control unit to adjust current supply for both auto-focus and optical image stabilization operations, enabling integrated tri-axis control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If separate and independent control circuits are used for auto-focus and optical image stabilization modules, then the device complexity is reduced and ease of manufacture is improved, but the focusing operation speed and precision deteriorate due to lack of integrated feedback control
Solution Approach 1:
The patent combines separate control circuits into a single integrated control circuit that manages both auto-focus and optical image stabilization functions. This merging enables real-time feedback control where the control circuit receives position feedback from both Z-axis (focusing) and X-Y axes (stabilization) simultaneously, allowing coordinated control that improves focusing speed and precision while maintaining manufacturing feasibility through circuit integration
2Device complexity
If separate feedback circuits are used for auto-focus and OIS modules, then the device complexity is reduced, but the measurement precision and control accuracy deteriorate due to inability to detect tri-axis positions simultaneously
Solution Approach 1:
The patent implements a universal feedback control circuit that performs multiple functions: detecting Z-axis position for auto-focus, detecting X-Y axis positions for optical image stabilization, and providing integrated feedback for coordinated control. This multi-functional circuit achieves high measurement precision for all three axes simultaneously without proportionally increasing device complexity, as the same control infrastructure serves multiple detection purposes
3Ease of operation
If independent control circuits are employed for auto-focus and OIS, then the ease of operation is improved for individual functions, but the productivity and responsiveness deteriorate due to delayed feedback response during shaking compensation
Solution Approach 1:
The patent implements an integrated feedback mechanism where the control circuit continuously receives position information from both auto-focus and optical image stabilization modules, processes this feedback in real-time, and generates coordinated control signals. This feedback loop enables the system to respond immediately to shaking events while maintaining focusing accuracy, improving productivity and responsiveness without compromising the ease of operation for individual functions
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 solution allows for faster and more precise focusing operations by integrating feedback control for auto-focus and optical image stabilization, enhancing the responsiveness and accuracy of the camera system's lens movements.
Implementation Method 1
a feedback circuit furnished with a Hall element for detecting a position of the lens holder along the Z-axis direction
Data Source
AI summary
The tri-axis close-loop feedback controlling module for electromagnetic lens driving device includes a 6-pin Hall element. Two pins of the Hall element are coupled to an auto-focus module for providing a current to drive the auto-focus module to conduct auto-focusing operations along the Z-axis; while other four pins of the Hall element are coupled to a control unit. The control unit detects the X-Y axial positions of the auto-focus module relative to an OIS module and generates a control signal which is then sent to the Hall element. Therefore, the Hall element not only can provide its own feedback controlling function according to the Z-axial position of lens, but also can drive the auto-focus module based on the control signal corresponding to the X-Y axial positions of the auto-focus module, so as to achieve the goal of tri-axis close-loop feedback controlling for the electromagnetic lens driving device.