Optical Scanning Device Stabilizing Irradiation Timing
Solution Overview
Problem
Existing optical scanning devices experience a decrease in image quality due to unstable signal waveforms from angle detection sensors, which cause shifts in the output timing of reference signals, affecting the irradiation timing of light and ultimately the quality of drawn images.
Innovation Solution
The optical scanning device employs a processor to derive average phase delay times from the output signals of first and second angle detection sensors, generating reference signals based on these delays to stabilize the irradiation timing of light, thereby maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If reference signal output timing is determined directly from angle detection sensor signals, then the system structure remains simple, but the output timing shifts causing image quality degradation
Solution Approach 1:
The patent introduces a reference signal generation unit that acts as an intermediary between the angle detection sensors and the light irradiation control. This unit generates reference signals based on the detection signals from both angle detection sensors, mediating the timing information to ensure stable light irradiation timing without directly exposing the system's internal complexity
Solution Approach 2:
The patent performs preliminary generation of reference signals before light irradiation occurs. The reference signal generation unit prepares stable timing references in advance based on the angle detection signals, ensuring that when light irradiation occurs, the timing is already optimized and stable, preventing image quality degradation
2Device complexity
If light irradiation timing is controlled directly by angle detection sensor signals, then the control system remains simple, but the irradiation timing shifts causing image quality decrease
Solution Approach 1:
The patent implements a feedback mechanism where the reference signal generation unit continuously monitors the detection signals from both angle detection sensors and adjusts the reference signal timing accordingly. This feedback loop ensures that variations in sensor output are compensated, maintaining stable light irradiation timing and reliable image quality
Solution Approach 2:
The system performs preliminary generation of stable reference signals before light irradiation occurs. By pre-processing the timing information from both angle detection sensors and generating stable reference signals in advance, the system ensures reliable irradiation timing without requiring complex real-time control adjustments
Data Source
AI summary
A driving controller provides a first driving signal having a first driving frequency to a first actuator, provides a second driving signal having a second driving frequency to a second actuator, derives a first average phase delay time by averaging a first phase delay time of an output signal of a first angle detection sensor with respect to the first driving signal in a plurality of cycles, derives a second average phase delay time by averaging a second phase delay time of an output signal of a second angle detection sensor with respect to the second driving signal in a plurality of cycles, generates a first reference signal based on the first driving signal and the first average phase delay time, and generates a second reference signal based on the second driving signal and the second average phase delay time.