Camera Module Actuator Controller Drift Compensation
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Solution Overview
Problem
Camera modules experience moving drift due to differences in driving characteristics of the lens unit, affecting image quality and screen performance, as the lens unit moves in optical axis and perpendicular directions within the camera module.
Innovation Solution
A camera module design that includes an actuator unit capable of moving the lens unit in three directions relative to the housing unit, with an actuator controller that compensates for moving drift by adjusting the actuator's movement based on the lens unit's position, using a combination of actuators and sensors to maintain precise positioning and minimize displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the lens unit is designed to move independently in each direction for auto-focus and optical image stabilization, then the camera module achieves both auto-focus and OIS functions, but moving drift occurs due to differences in driving characteristics
Solution Approach 1:
The actuator controller receives feedback signals from position detection sensors that detect the actual position of the lens unit in real-time. Based on this feedback, the controller calculates compensation amounts for moving drift and adjusts the driving signals to the actuators accordingly, forming a closed-loop control system that maintains positioning accuracy despite independent movement in multiple directions
Solution Approach 2:
The system changes the driving parameters of the actuators dynamically based on the lens unit's position. The actuator controller adjusts driving characteristics such as voltage, current, or pulse width according to the detected position and calculated compensation amounts, allowing the lens unit to move independently in multiple directions while compensating for moving drift through parameter modulation
2Measurement precision
If the lens unit moves in optical axis direction for auto-focus, then focusing capability is achieved, but moving drift in perpendicular directions affects image quality
Solution Approach 1:
The actuator controller calculates compensation amounts for moving drift in perpendicular directions based on the lens unit's position in the optical axis direction. Before the moving drift significantly degrades image quality, the controller applies compensatory driving signals to counteract the drift, preventing image quality degradation rather than correcting it after occurrence
3Reliability
If the lens unit moves in perpendicular directions for optical image stabilization, then shaking compensation is achieved, but moving drift in optical axis direction affects resolution
Solution Approach 1:
When the lens unit moves in perpendicular directions for optical image stabilization, the actuator controller dynamically adjusts the driving parameters to compensate for moving drift in the optical axis direction. By modulating the actuator driving signals based on position feedback and calculated compensation amounts, the system maintains resolution while achieving stabilization
4Adaptability or versatility
If separate actuators are used for independent movement in multiple directions, then dual functions are achieved, but device complexity increases
Solution Approach 1:
The actuator controller is designed as a universal control unit that manages multiple actuators and handles both auto-focus and optical image stabilization functions. By integrating the control logic for multiple directions and functions into a single controller that uses a unified feedback mechanism and compensation algorithm, the system achieves multi-functionality without proportionally increasing complexity
Data Source
AI summary
A camera module includes a lens unit disposed in a housing unit; an actuator unit configured to drive the lens unit in first through third directions relative to the housing unit; and an actuator controller configured to control the actuator unit according to compensation amounts for moving drift in the second and third directions depending on a position of the lens unit in the first direction.