Camera Module Magnet Position Sensing with Dual Sensor Segmentation
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Solution Overview
Problem
Camera modules face challenges in maintaining high sensing sensitivity during long strokes due to the limitations of Hall sensors, which struggle to accurately measure the position of movers with increased movement distances.
Innovation Solution
A camera module design incorporating a magnet on a mover with two sensor units and a driving driver that receives signals from both sensors, connected in parallel, to amplify and convert signals into digital form, allowing for accurate position measurement across extended ranges by calibrating each sensor unit based on specific sensing values and gain values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single Hall sensor is used to sense the position of the magnet, then the device complexity is low, but the sensing sensitivity weakens during long strokes
Solution Approach 1:
The sensing system is divided into multiple sensor units (first sensor unit and second sensor unit), each responsible for sensing different regions of the magnet's movement. This segmentation allows each sensor to maintain high sensitivity within its specific range while collectively covering the entire long stroke distance, resolving the contradiction between sensitivity and stroke length.
Solution Approach 2:
The patent transitions from a single-point sensing approach to a multi-point sensing approach by positioning sensor units at different locations along the movement path. This dimensional expansion in the sensing architecture enables accurate position detection across extended ranges without sacrificing sensitivity.
2Adaptability or versatility
If the moving distance of the mover increases, then the zooming and focusing range is improved, but the Hall sensor's sensing sensitivity weakens
Solution Approach 1:
The total movement range is segmented into multiple regions, with each sensor unit optimized for its specific region. This allows the system to achieve both extended range and high precision by ensuring that no single sensor is overloaded beyond its optimal sensing capability.
Solution Approach 2:
Multiple sensor units act as intermediaries that collectively bridge the gap between the magnet and the control system across long distances. Each sensor serves as a local measurement point, and their combined data provides accurate position information throughout the entire range of motion.
3Measurement precision
If multiple sensor units are connected in parallel to the driving driver, then the position measurement accuracy is improved, but the device complexity increases
Solution Approach 1:
The driving driver is designed with multi-functionality to handle signals from multiple sensor units simultaneously. It can perform calibration, signal amplification, and position calculation for all sensors through a unified processing mechanism, reducing the complexity increase that would otherwise result from adding multiple independent processing channels.
Solution Approach 2:
The system utilizes parameter changes (gain values) for each sensor unit to optimize their output signals. By adjusting these parameters during calibration and operation, the driving driver can normalize signals from different sensors, simplifying the overall signal processing despite the increased number of sensors.
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 enables the camera module to maintain high sensing sensitivity and accurately measure positions even during long strokes, enhancing the camera's ability to perform optical image stabilization, auto focusing, and zooming functions.
Implementation Method 1
The Hall sensor may detect a magnetic force of a magnet and sense a position of a mover coupled to the magnet
Data Source
AI summary
A camera module according to an embodiment of the present invention comprises: a magnet disposed in a mover for moving at least one lens; a first sensor unit for sensing the position of the magnet in correspondence to a first region in a moving region of the mover; a second sensor unit for sensing the position of the magnet in correspondence to a second region in the moving region of the mover; and a driving driver for receiving a first sensing signal of the first sensor unit and a second sensing signal of the second sensor unit, wherein the first sensor unit and the second sensor unit are connected in parallel to the driving driver.