Micromirror Scan Control With Crosstalk-Aware Trajectory Estimation
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Solution Overview
Problem
Existing image drawing apparatuses using micromirror devices face challenges in accurately estimating scanning trajectories due to crosstalk between the axes, leading to suboptimal image quality.
Innovation Solution
An image drawing apparatus and method that utilize a processor to estimate scanning trajectories by incorporating deflection angle functions accounting for crosstalk between the first and second axes, controlling the mirror device to resonate about each axis, and synchronize light emission with the estimated trajectory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional scanning trajectory estimation methods are used, then the device complexity is low, but the measurement precision of scanning trajectory is insufficient due to crosstalk between axes
Solution Approach 1:
The patent implements feedback by using detection units to measure the actual deflection angles of the mirror portion about both axes, then feeding this information back to the control unit. The control unit uses this feedback to calculate correction values that compensate for crosstalk effects, thereby improving scanning trajectory estimation accuracy without requiring overly complex estimation functions.
Solution Approach 2:
The patent replaces complex mechanical trajectory control with computational methods. Instead of using complex mechanical mechanisms to physically eliminate crosstalk, the system uses mathematical models and algorithms to calculate and compensate for crosstalk effects in the control signals, substituting mechanical complexity with computational processing.
2Measurement precision
If crosstalk compensation is implemented, then the scanning trajectory estimation accuracy improves, but the control system complexity increases
Solution Approach 1:
The control system uses feedback from detection units to measure actual deflection angles and calculates correction values for crosstalk compensation. This feedback mechanism allows the system to adaptively compensate for crosstalk without requiring overly complex predetermined control algorithms, balancing accuracy improvement with manageable control system complexity.
Solution Approach 2:
The patent changes control parameters by introducing correction values that adjust the drive signals based on detected deflection angles. By dynamically modifying these parameters to compensate for crosstalk, the system achieves improved trajectory accuracy while maintaining relatively simple control logic through parameter adjustment rather than structural complexity.
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 enables the creation of high-quality laser-drawn images by accurately tracking the scanning trajectory, improving image quality.
Implementation Method 1
a piezoelectric element that causes the mirror portion to oscillate about a first axis and a second axis that are perpendicular to each other
Implementation Method 2
a mirror portion having a reflecting surface that reflects the light beam
Data Source
AI summary
The image drawing apparatus includes a light source and a processor that controls operations of a first actuator and a second actuator to scan a surface with a light beam reflected by a reflecting surface. The processor estimates a scanning trajectory of the light beam on the surface to be scanned by using a first deflection angle estimation function that is a function of time for the first deflection angle and that takes into account a temporal variation of the first deflection angle depends on the second deflection angle, and a second deflection angle estimation function that is a function of time for the second deflection angle and that takes into account a temporal variation of the second deflection angle depends on the first deflection angle, and causes the light source to emit the light beam in correspondence with the estimated scanning trajectory and the image information.