Actuator Driving Device Linearizing Lens Displacement Signals
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Solution Overview
Problem
Existing actuator driving devices for camera modules face challenges in accurately linearizing non-linear displacement signals from lens modules, leading to inefficiencies in auto-focusing and optical image stabilization.
Innovation Solution
An actuator driving device comprising a linearizer that corrects non-linear displacement signals using interpolation-based correction parameters and functions, a position controller that generates position control signals, and a driver that accurately moves the lens module based on these signals, ensuring precise positioning and stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a position detector senses magnetic field strength to detect lens module displacement, then the displacement can be detected, but the detected signal exhibits non-linearity with respect to actual displacement
Solution Approach 1:
The patent introduces a linearizer as an intermediary component between the position detector and the actuator driver. This linearizer processes the non-linear detection signal and transforms it into a linear signal that accurately represents the lens module displacement, thereby resolving the non-linearity issue while maintaining detection accuracy
Solution Approach 2:
The patent applies parameter transformation by converting the non-linear magnetic field strength signal into a linear displacement signal through mathematical processing. The linearizer changes the signal parameters (from non-linear to linear) to ensure accurate representation of the lens module position
2Manufacturing precision
If correction parameters are stored in memory and applied by the linearizer, then signal linearity is improved, but the device complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-calculating and storing correction parameters in memory before actual operation. During runtime, the linearizer simply retrieves and applies these pre-computed parameters, which simplifies the real-time processing while maintaining high signal linearity
Solution Approach 2:
The patent uses copying by storing correction parameters in memory as a separate data structure. Instead of implementing complex real-time correction algorithms, the system copies pre-computed correction data into memory and applies it during operation, reducing computational 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
The solution enables accurate and efficient auto-focusing and optical image stabilization by linearizing non-linear displacement signals, improving the performance and reliability of camera modules in electronic devices.
Implementation Method 1
sense a strength of a magnetic field, produced by a magnetic body disposed in the lens module, to detect the displacement of the lens module
Data Source
AI summary
An actuator driving device includes: a linearizer configured to linearize a first signal, indicative of a displacement of a lens module, to generate a second signal; a position controller configured to generate a position control signal in response to the second signal and a control input signal indicative of a target location of the lens module; and a driver configured to drive an actuator in response to the position control signal.