Camera Module Lens Stabilization via Hall Sensor Linearization
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Solution Overview
Problem
Existing image stabilization technologies using Hall sensors for lens movement correction often result in nonlinear signal characteristics, leading to inadequate lens movement and increased suppression ratio and center error, which can degrade image quality and increase assembly tilt tolerance in camera systems.
Innovation Solution
An electronic device with a control circuit that acquires signals from multiple lens units, performs linearization correction, and adjusts the optical image stabilizers to ensure precise movement of the lens units, thereby reducing center error and increasing the movable distance and reducing assembly tilt tolerance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a Hall sensor is used to detect lens movement for image stabilization, then lens movement can be detected, but the signal characteristics become nonlinear causing the lens to move an incorrect amount
Solution Approach 1:
The patent applies parameter changes by transforming the nonlinear Hall sensor signal into a linear signal through mathematical conversion. The control circuit changes the signal parameter from nonlinear to linear, enabling accurate correspondence between the drive signal and actual lens movement distance, thereby resolving the precision issue.
2Reliability
If lens movement is controlled based on Hall sensor signals, then image stabilization can be performed, but the lens may be displaced to unintended locations
Solution Approach 1:
The patent implements feedback by continuously monitoring the Hall sensor signal, converting it to a linear signal, and using this corrected feedback information to adjust the drive signal. This closed-loop feedback mechanism ensures the lens returns to the correct center position and maintains accurate positioning during stabilization operations.
3Device complexity
If nonlinear Hall sensor signals are used for lens control, then device complexity is reduced, but suppression ratio decreases
Solution Approach 1:
The patent changes the signal parameter from nonlinear to linear through mathematical transformation, improving the suppression ratio and stabilization performance. This parameter change approach maintains relatively simple device structure while significantly enhancing the effectiveness of image stabilization.
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 ensures that lens units move the intended amount, reducing center error and assembly tilt tolerance, thereby enhancing image quality and stability in camera systems.
Implementation Method 1
One of available image stabilization technologies may include performing image stabilization by detecting a change in a magnetic field caused by the movement of a lens due to the camera shaking, using a Hall sensor
Implementation Method 2
a first optical image stabilizer (OIS) capable of correcting the shaking of the first lens unit; a second optical image stabilizer capable of correcting the shaking of the second lens unit
Data Source
AI summary
In an electronic device for controlling the shaking of a lens part of a camera module and an operation method for the electronic device according to various embodiments, the electronic device includes: a housing; a first camera that is accommodated in the housing and includes a first lens part capable of refracting light, reflected from an external object, through one surface of the housing, and a first optical image stabilizer (OIS) capable of compensating for the shaking of the first lens part; a second camera that is accommodated in the housing and includes a second lens part capable of refracting light, reflected from the external object, through the one surface and a second optical image stabilizer capable of compensating for the shaking of the second lens part; and a control circuit, wherein the control circuit may be configured to: acquire an image of the external object by using the first camera and the second camera; acquire a first signal, corresponding to the shaking of the first lens part, and a second signal, corresponding to the shaking of the second lens part, while acquiring the image; verify compensation information that is compensated so that the movement amount of the first lens part or the second lens part according to a signal corresponding to a predetermined movement amount of the first lens part or the second lens part is substantially the same as the predetermined movement amount; determine a control signal on the basis of the first signal, the second signal, and the compensation information; and move the first lens part by using the first optical image stabilizer or the second lens part by using the second optical image stabilizer on the basis of the control signal. Various other embodiments are also possible.