Optical Deflector Drive Timing for Stripe-Free Mirror Scanning
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Solution Overview
Problem
Existing optical deflector systems experience abnormal oscillation and striped patterns in the pictures drawn by light scanning due to unintended frequency components in the driving signal waveform when changes in offset or amplitude are reflected.
Innovation Solution
The optical deflector system employs a configuration with piezoelectric cantilevers arranged in a bellows shape, applying different driving voltages to even and odd-numbered cantilevers to prevent abnormal oscillation by reflecting changes in offset or amplitude at a determined minimum voltage timing, removing unnecessary frequency components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If change in offset or amplitude is reflected at the timing when instruction to change is input, then offset or amplitude adjustment is achieved, but abnormal oscillation occurs in the optical deflector causing striped patterns in the picture
Solution Approach 1:
The system performs preliminary detection of the driving signal waveform and identifies the minimum voltage timing before reflecting the offset or amplitude change. By preparing the timing information in advance and using it to control when the change is reflected, the system prevents abnormal oscillation while achieving the desired offset adjustment.
Solution Approach 2:
The system continuously monitors the driving signal waveform to detect minimum voltage points and uses this feedback information to determine the optimal timing for reflecting offset or amplitude changes. This feedback mechanism ensures that changes are reflected at the most appropriate moment to avoid oscillation.
2Ease of operation
If change in offset or amplitude is reflected at arbitrary timing, then offset adjustment is achieved, but unnecessary frequency components are introduced causing abnormal oscillation
Solution Approach 1:
The system preliminarily analyzes the driving signal waveform to identify minimum voltage timing before reflecting the offset change. This preliminary preparation allows the system to maintain responsive offset adjustment while avoiding the introduction of harmful frequency components by timing the reflection appropriately.
Solution Approach 2:
The system changes the timing parameter of the offset reflection based on the detected minimum voltage point in the driving signal waveform. By dynamically adjusting the reflection timing according to the waveform characteristics, the system maintains operational responsiveness while eliminating unwanted frequency components.
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 configuration effectively prevents abnormal oscillation and striped patterns by synchronizing the reflection of offset or amplitude changes with the minimum voltage timing, ensuring stable picture drawing.
Implementation Method 1
a plurality of piezoelectric cantilevers disposed in a direction of the swing axis. The plurality of piezoelectric cantilevers are coupled in a bellows shape to cause each of the piezoelectric cantilevers to be folded back relative to an adjacent piezoelectric cantilever
Data Source
AI summary
An optical deflector driving method includes inputting an instruction to change at least one of a first driving signal corresponding to a first driving voltage and a second driving signal corresponding to a second driving voltage, the first driving voltage and the second driving voltage being applied to an actuator swinging a mirror portion of an optical deflector around a swing axis; determining, in a case where the instruction is input, a timing when a voltage of a driving signal to be changed out of the first driving signal and the second driving signal becomes minimum; and reflecting, in a case where it is determined that the timing when the voltage of the driving signal to be changed becomes minimum comes, the change on the driving signal to be changed.