Optical scanning device, driving method of optical scanning device, and image drawing system
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Solution Overview
Problem
Existing optical scanning devices face issues with maintaining a constant frequency ratio between driving signals when changing the frequencies of the first and second driving signals, leading to image blur.
Innovation Solution
An optical scanning device with a processor that adjusts the first and second driving frequencies in units of their greatest common divisor, using a common clock signal to synchronize changes and maintain the frequency ratio, while incorporating angle detection sensors and phase shift mechanisms to ensure precise scanning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the frequency of the first driving signal and the frequency of the second driving signal are changed independently, then the scanning speed and frame rate can be adjusted flexibly, but the frequency ratio between the two signals changes causing image blur
Solution Approach 1:
The control unit continuously monitors the frequencies of both driving signals and dynamically adjusts them to maintain a constant frequency ratio. When one frequency is changed, the system calculates and applies the corresponding adjustment to the other frequency, ensuring the ratio remains constant and preventing image blur while allowing flexible speed adjustments
Solution Approach 2:
The system changes the frequencies of the driving signals in a coordinated manner based on their mathematical relationship (frequency ratio). By treating the frequencies as interdependent parameters rather than independent variables, the system can adjust scanning speed while maintaining the precise frequency ratio required for clear image display
2Productivity
If the frequency of the first driving signal is increased to improve scanning speed, then the frame rate increases, but maintaining the frequency ratio becomes difficult leading to scanning path distortion
Solution Approach 1:
The system implements dynamic frequency adjustment where the control unit continuously adapts the frequencies of both driving signals in real-time. When the scanning speed requirement changes, the system dynamically recalculates and adjusts both frequencies together to maintain the constant frequency ratio, ensuring reliable operation across different scanning speeds
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 solution maintains a constant frequency ratio between the first and second driving signals, preventing image blur and ensuring accurate Lissajous scanning even when environmental conditions change.
Implementation Method 1
a first actuator that causes the mirror portion to swing around a first axis
Implementation Method 2
a second actuator that causes the mirror portion to swing around a second axis
Implementation Method 3
a mirror portion that has a reflecting surface on which an incidence ray is reflected
Data Source
AI summary
A driving controller provides a first driving signal having a first driving frequency corresponding to a first set value to a first actuator, provides a second driving signal having a second driving frequency corresponding to a second set value to a second actuator, changes the first driving frequency by changing the first set value in units of a first number obtained by dividing the first set value by a greatest common divisor of the first set value and the second set value, and changes the second driving frequency by changing the second set value in units of a second number obtained by dividing the second set value by the greatest common divisor.