Position Control System for Image Shake Correction
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Solution Overview
Problem
Existing position control systems for image shake correction in digital cameras face challenges in maintaining precise driving force control due to size reductions and asymmetric magnet configurations, leading to imbalanced driving forces and reduced ability to follow position control, especially when influenced by flexible cables.
Innovation Solution
A position control system that includes a fixed and moving portion, a position-detection portion using Hall elements, and a control portion that applies driving force based on correction coefficients derived from deviations between the drive target position and detected positions, employing PID control to adjust for decreased driving force and imbalances caused by size reductions and asymmetric magnet configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If size reductions are implemented in the voice coil motor, then the device becomes more compact, but driving force control precision deteriorates
Solution Approach 1:
The system implements feedback control by detecting the actual position of the moving portion and comparing it with the drive target position. The control portion adjusts the driving force based on the detected position feedback, ensuring precise control despite size reductions. This closed-loop feedback mechanism compensates for the reduced control precision inherent in miniaturized components.
Solution Approach 2:
The system applies correction coefficients that are determined based on the drive target position and detected position to adjust the driving force. By dynamically changing control parameters (correction coefficients) based on operational conditions, the system maintains precise driving force control even with size-reduced components that have altered magnetic flux characteristics.
2Device complexity
If asymmetric magnet configurations are used, then the device complexity is reduced, but driving force balance deteriorates
Solution Approach 1:
The control portion uses position feedback to detect imbalances in driving force caused by asymmetric magnet configurations. By continuously monitoring the detected position against the drive target position, the system identifies driving force imbalances and applies corrective adjustments to maintain proper force balance despite the asymmetric configuration.
Solution Approach 2:
The system determines correction coefficients based on the drive target position and detected position to compensate for driving force imbalances. These dynamic parameter adjustments counteract the effects of asymmetric magnet configurations, ensuring balanced driving force is applied to the moving portion throughout its range of motion.
3Measurement precision
If position control precision is improved, then the system responsiveness increases, but operating noises increase
Solution Approach 1:
The system applies position-dependent correction coefficients that are determined based on the drive target position and detected position. By dynamically adjusting control parameters according to the operating position, the system achieves precise position control while minimizing operating noises through optimized driving force application at different positions.
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 system effectively improves the ability to follow position control by compensating for driving force imbalances and maintaining precision despite size reductions and asymmetric magnet configurations, enhancing the system's responsiveness and reducing operating noises.
Implementation Method 1
there is a Hall element used that is capable of detecting changes in the magnetic flux generated from the magnet
Implementation Method 2
the voice coil motor is operated by energizing the coil to generate driving force proportional to a magnetic flux through the coil
Data Source
AI summary
The invention provides a position control system comprising a moving portion that is movable, a position-detection portion that detects a position of the moving portion, a drive portion that applies driving force to the moving portion thereby moving the moving portion, a control portion that controls the driving force of the drive portion, and an input portion for inputting a drive target position for the moving portion, characterized in that the control portion is operable to determine the driving force to be applied to the drive portion based on a correction coefficient acquired based on a first deviation that is a difference between the drive target position inputted into the input portion and the reference position, and a second deviation that is a difference between a position detected by the position-detection portion and the drive target position inputted into said input portion.