Camera Actuator Offset Calibration via Sectional Linear Functions
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Solution Overview
Problem
Camera modules in portable communication devices face challenges in accurately controlling autofocusing and optical image stabilization functions due to offsets between the actual and target positions of the lens barrel, which affect image quality and require effective calibration methods.
Innovation Solution
An actuator system with a position detector and driver that generates a feedback signal to adjust the input signal based on calculated offsets, using a signal adjuster with an offset calculator and linear calibrator to apply sectional linear calibration functions, ensuring precise positioning of the lens barrel through a closed-loop system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If offset calibration is performed to improve positioning accuracy, then manufacturing precision and measurement precision are improved, but device complexity increases due to additional calibration functions and signal adjustment mechanisms
Solution Approach 1:
The calibration process is divided into multiple sections along the movement range of the lens barrel. Different linear calibration functions are applied to different sections, allowing precise calibration without requiring a single complex non-linear function across the entire range. This segmentation reduces the overall complexity while maintaining high positioning accuracy.
Solution Approach 2:
The patent changes the parameters of linear calibration functions (slope and intercept) for different sections of the lens barrel movement range. By adjusting these parameters based on actual positioning data, the system achieves high manufacturing precision without implementing a complex unified calibration model.
2Measurement precision
If sectional linear calibration functions are applied to improve linearity and accuracy, then measurement precision is improved, but the complexity of signal processing increases
Solution Approach 1:
The input signal range is divided into multiple sections, and each section has its own linear calibration function. This segmentation allows the use of simple linear equations rather than complex non-linear transformations, reducing signal processing complexity while improving measurement precision within each section.
Solution Approach 2:
Instead of applying a single complex calibration function across the entire signal range, the patent uses multiple simple linear functions that cover partial ranges. This approach achieves high precision through simpler partial actions rather than one complex action.
Data Source
AI summary
An actuator of a camera module includes a position detector configured to generate a feedback signal based on a detected position of a lens barrel; and a driver configured to drive the lens barrel based on a difference between an input signal indicating a target position of the lens barrel and the feedback signal, wherein the driver includes a signal adjuster configured to calculate an offset between the target position of the lens barrel and an actual position of the lens barrel, and apply the input signal to a calibration function based on the offset to generate a calibrated input signal.