Actuator Control via Induced Voltage Feedback for Autofocus Settling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Autofocus systems in electronic devices face increased settling time due to resonance vibrations caused by external forces and control operations, as existing systems are not designed to directly stop or suppress these vibrations.
Innovation Solution
The implementation of an induced voltage detection circuit and feedback control systems that utilize the self-induced voltage generated by the actuator to adjust its position, thereby reducing settling time by suppressing resonance vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If constant current is applied to the actuator, then the actuator generates constant force for lens movement, but resonance vibrations occur causing increased settling time
Solution Approach 1:
The patent implements a feedback control system that detects the induced voltage generated by the actuator and uses this information to adjust the drive signal. The controller monitors the actuator's response and dynamically adjusts the current to suppress resonance vibrations, thereby reducing settling time while maintaining the constant force capability when needed.
Solution Approach 2:
The patent converts the harmful resonance vibrations into a useful signal by detecting the induced voltage generated during vibration. This induced voltage serves as feedback information that the controller uses to generate counteracting signals, transforming the problematic vibration into a diagnostic and control resource that actively reduces the settling time.
2Stability of the object's composition
If the actuator operates in normal mode, then it provides stable lens positioning, but it cannot directly stop or suppress resonance vibrations
Solution Approach 1:
The patent makes the actuator control system multi-functional by enabling it to perform both normal positioning operations and vibration suppression. The same actuator and control circuitry that provide stable positioning are enhanced with induced voltage detection and adaptive control capabilities, allowing the system to switch between or combine positioning and vibration suppression modes as needed.
Solution Approach 2:
The patent transforms the static normal operating mode into a dynamic adaptive mode. The controller continuously monitors the induced voltage and adjusts the drive signal in real-time, allowing the actuator to dynamically respond to vibration conditions. This dynamic adjustment enables the system to maintain positioning stability while actively suppressing resonances that would otherwise persist.
3Loss of time
If induced voltage detection circuit is added, then vibration suppression is achieved, but device complexity increases
Solution Approach 1:
The patent implements a self-service control approach where the actuator's own induced voltage serves as the sensing signal for vibration detection. Rather than requiring an external sensor to detect vibrations, the system uses the electrical property naturally generated by the actuator during motion, eliminating the need for additional mechanical sensors and simplifying the overall system architecture.
Solution Approach 2:
The patent merges the sensing and actuation functions into a single integrated system. The induced voltage detection circuit is combined with the existing drive circuitry, and the control algorithm integrates both positioning and vibration suppression objectives. This merging reduces the number of separate components and simplifies the control architecture while achieving both functions simultaneously.
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 approach significantly reduces the time it takes for the actuator and lens to reach a desired position, improving autofocus performance by continuously providing feedback control and adjusting the drive signal based on the induced voltage, thus enhancing image stabilization and quality.
Implementation Method 1
When a constant current is applied to the actuator, a constant force is created as well as an induced voltage that is proportional to the velocity of the actuator
Implementation Method 2
the operation of the actuator is governed by the Lorentz Force principle
Data Source
AI summary
Various embodiments of the present technology may comprise methods and apparatus for actuator control. The methods and apparatus may comprise various circuits and/or systems to detect an induced voltage and various signal processing functions to utilize the induced voltage to control the actuator. The apparatus for actuator control may comprise an induced voltage detection circuit and adjust the actuator position according to the detected induced voltage.