Microscanner Drive Signal Shaping for Uniform Beam Scanning
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Solution Overview
Problem
Existing microscanner devices struggle to achieve uniform and high-resolution scanning of image areas due to non-uniform sweeping trajectories of light beams.
Innovation Solution
A method and processing unit for activating the drive units of deflection units in a microscanner device, involving the generation and transfer of control signals to produce sinusoidal movements about two axes, with periodic adjustments to these movements to enhance scanning homogeneity and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sinusoidal control signals are used to activate drive units for light beam oscillation, then the light beam can sweep the image area, but the scanning trajectory becomes non-uniform resulting in areas with low resolution
Solution Approach 1:
The patent applies periodic action by superimposing a periodic fourth movement on the sinusoidal second movement of the deflection unit. This periodic superimposed movement compensates for the non-uniform scanning trajectory, ensuring that the light beam sweeps through all areas of the image with uniform resolution. The periodic adjustment modifies the control signals to create additional deflection cycles that fill in the gaps caused by the primary sinusoidal motion.
2Manufacturing precision
If the trajectory uniformly sweeps the image area, then high resolution is achieved, but the scanning homogeneity deteriorates due to non-uniform light beam oscillation
Solution Approach 1:
The patent uses periodic action to maintain scanning homogeneity by superimposing periodic movements on the primary sinusoidal oscillations of the deflection unit. The periodic fourth movement is specifically designed to counteract the non-uniformities in the light beam oscillation, ensuring that all regions of the image area are scanned with consistent homogeneity and resolution.
Solution Approach 2:
The patent applies parameter changes by modifying the control signals to the drive units. Specifically, the second control signals are adapted to include a superimposed periodic fourth movement, which changes the motion parameters of the second deflection unit. This parameter modification allows the system to achieve both uniform scanning trajectory and consistent scanning homogeneity across the entire image area.
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 results in significantly improved homogeneity of scanning without discernible low-resolution areas, achieving better uniformity and higher resolution in projecting images.
Implementation Method 1
A sinusoidal first movement of the at least one deflection unit about a first axis is then carried out at a first point in time as a function of the transferred first control signals
Implementation Method 2
The sinusoidal first movement of the at least one deflection unit about the first axis is preferably carried out resonantly as a function of the transferred first control signals
Implementation Method 3
The first control signals transferred from the processing unit to the at least one drive unit are adapted in such a way that a periodic third movement is superimposed on the first movement at a second point in time following the first point in time
Data Source
AI summary
A method for activating a drive unit of a deflection unit of a two-dimensional microscanner device. First and second control signals for activating the drive unit of the deflection unit are initially generated using a processing unit. The first and second control signals are subsequently transferred to the drive unit. A sinusoidal first movement of the deflection unit about a first axis and a sinusoidal second movement of the deflection unit about a second axis are carried out at a first point in time based on the transferred control signals. The first control signals are then adapted so that a periodic third movement is superimposed on the first movement at a second point in time following the first point in time. Alternatively, the second control signals are adapted so that a periodic fourth movement is superimposed on the second movement at the second point in time following the first.