Optical Element Driving Method Using Adaptive Piezoelectric Signals
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Solution Overview
Problem
Modern electronic devices with image-capturing and video-recording functions face challenges in reducing the size of optical systems while maintaining durability and achieving effective auto focus and optical image stabilization.
Innovation Solution
A driving method involving a piezoelectric driving assembly that provides a combination of positive, negative, and middle driving signals with specific durations to move optical elements, with adjustments based on temperature to optimize driving force and prevent invalidation at high temperatures, allowing for miniaturization and improved image stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the optical system is miniaturized to reduce device size, then the size of the optical system is reduced, but the durability and reliability of the optical element driving mechanism deteriorate
Solution Approach 1:
The patent applies dynamics by making the driving signals adaptive rather than static. The control unit dynamically adjusts the driving signals based on real-time temperature feedback from the driving element, allowing the system to maintain optimal performance and reliability across varying thermal conditions despite miniaturization constraints.
Solution Approach 2:
The patent changes the parameters of the driving signals (amplitude, duration, frequency) based on temperature conditions. By adjusting these parameters dynamically, the system compensates for temperature-induced variations in the piezoelectric driving element's characteristics, thereby maintaining reliability in a miniaturized optical system.
2Speed
If the driving element operates at high temperature, then the driving speed may increase, but the driving element becomes invalid and cannot drive the movable portion
Solution Approach 1:
The patent implements feedback by continuously monitoring the temperature of the piezoelectric driving element and using this information to adjust the driving signals. This closed-loop control prevents the driving element from operating beyond its valid temperature range, ensuring it remains operational while optimizing driving speed within safe limits.
Solution Approach 2:
The patent applies beforehand cushioning by proactively adjusting driving signals before the driving element reaches invalid temperature conditions. The control unit preemptively modifies signal parameters in response to temperature trends, preventing thermal runaway or invalidation of the piezoelectric element while maintaining efficient operation.
3Ease of operation
If conventional driving signals are used without temperature adjustment, then the system is simpler to control, but the driving precision and reliability deteriorate under temperature variations
Solution Approach 1:
The patent applies self-service by enabling the system to automatically adjust its own driving parameters based on internal temperature conditions. The control unit autonomously modifies driving signals without external intervention, maintaining high driving precision across temperature variations while keeping the user interface simple and unchanged.
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 method enables efficient miniaturization of optical systems, enhances durability, and improves image stabilization by effectively controlling the movement of optical elements, even at varying temperatures, thereby addressing the size and durability concerns in modern electronic devices.
Implementation Method 1
driving assembly including piezoelectric driving assembly
Implementation Method 2
the first driving element has a first capacitance at the first temperature. The first driving element has a second capacitance at the second temperature. The first capacitance is less than the second capacitance.
Data Source
AI summary
A driving method is provided. The driving method includes providing first driving information to a first driving element to drive a first movable portion to move relative a fixed portion in a first direction. The first driving information has a total duration, and includes positive driving signal, negative driving signal, and middle driving signal. The positive driving signal has a positive duration, the negative driving signal has a negative duration, and the middle driving signal has a middle duration. The positive duration, the negative duration, and the middle duration add up as the total duration. A ratio of the positive duration to the total duration is between 0.1 and 0.15.