Vibration Member Driving Circuit Resonance Frequency Compensation
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Solution Overview
Problem
Existing dust removal devices for image pickup apparatuses face issues with unstable voltage amplitudes when the resonance frequency of vibration members changes, leading to increased power consumption and potential damage, as well as reduced dust removal efficiency due to inadequate vibration amplitudes.
Innovation Solution
A vibration member driving circuit that maintains a stable voltage amplitude with minimal alternating voltage changes, even when the resonance frequency varies, by matching the series resonance frequency of an inductor and capacitor with the vibration member's resonance frequency, and adjusting the phase and pulse width to optimize voltage output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the alternating voltage amplitude is increased to maintain sufficient vibration amplitude when resonance frequency varies, then the dust removal efficiency is improved, but the power consumption increases and the optical member may be damaged
Solution Approach 1:
The driving circuit includes a frequency characteristic correction unit that detects changes in the resonance frequency of the vibration member and automatically adjusts the voltage amplitude accordingly. This feedback mechanism ensures that the vibration member receives the precise voltage needed to maintain effective dust removal performance without excessive power consumption or risk of damage from over-voltage.
Solution Approach 2:
The system dynamically changes the voltage amplitude parameter based on the detected resonance frequency. When the resonance frequency shifts due to individual differences or thermal effects, the driving circuit adjusts the voltage amplitude to compensate, maintaining optimal vibration levels for dust removal while avoiding both under-performance and over-power conditions.
2Use of energy by moving object
If the alternating voltage amplitude is decreased to reduce power consumption, then the power consumption is reduced, but the vibration amplitude becomes insufficient and dust removal efficiency decreases
Solution Approach 1:
The frequency characteristic correction unit continuously monitors the resonance frequency and provides feedback to adjust the voltage amplitude. This ensures that the system uses the minimum necessary power to achieve effective dust removal by precisely matching the voltage to the actual resonance conditions, avoiding both power waste and insufficient vibration.
3Stability of the object's composition
If the alternating voltage is adjusted to compensate for resonance frequency variations, then the vibration amplitude stability is improved, but the device complexity increases due to additional control circuits
Solution Approach 1:
The driving circuit incorporates a feedback mechanism where the frequency characteristic correction unit detects resonance frequency changes and automatically adjusts the voltage amplitude. This self-regulating approach maintains stable vibration amplitude without requiring complex external control systems, achieving stability through integrated feedback rather than elaborate external control architecture.
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 solution reduces power consumption, prevents damage to optical members, and maintains efficient dust removal by stabilizing voltage amplitudes and vibration frequencies, ensuring consistent performance despite variations in resonance frequency.
Implementation Method 1
Piezoelectric elements 101a and 101b which are electro-mechanical energy conversion elements are placed at different positions
Implementation Method 2
The frequency of the alternating voltage to be applied is between a resonance frequency in an m-order (where m is a natural number) vibration mode
Data Source
Figure 1A~1C
Figure 2A~2B
Figure 3
AI summary
A vibration member driving circuit causes vibrations in a vibration member (501) at least including an electro-mechanical energy conversion element and an elastic body by applying alternating voltage to the electro-mechanical energy conversion element fixed to the elastic body. The vibration member driving circuit includes an inductor (102) and capacitor (103) serially connected to the electro-mechanical energy conversion element. 0.73*fm < fs < 1.2*fm is satisfied where fs is the series resonance frequency by the inductor (102) and the capacitor and fm is the resonance frequency of the vibration member.