Oscillating Mirror Phase Alignment via Complementary Scan Lines
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Solution Overview
Problem
Existing phase alignment methods for oscillating mirrors in ultra-precision manufacturing are complex, lack precision, and require additional optical or electrical components, making them difficult to implement effectively.
Innovation Solution
A phase alignment system and method using a laser light source, oscillating mirror, and scan controller, which constructs and matches first and second scan lines to adjust the phase difference parameter, achieving precise alignment without additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If indirect calculation of phase difference by detecting edge position of projected pattern is used, then phase alignment can be achieved, but the operation becomes difficult and alignment precision deteriorates due to dependency on detection accuracy and parallel alignment requirements
Solution Approach 1:
The patent introduces a light source as an intermediary element to project a light strip onto the oscillating mirror, which then reflects the light to form a light spot on the projection plane. This intermediary light projection system enables direct observation and adjustment of the phase difference between the drive signal and the mirror's actual oscillation, eliminating the need for complex edge position detection and parallel alignment operations.
2Measurement precision
If additional optical or electrical components are added for phase alignment, then alignment functionality is improved, but device complexity increases
Solution Approach 1:
The patent makes the light source serve multiple functions: it acts as both the illumination source for phase alignment adjustment and as a functional component for the overall optical system. The projection plane also serves dual purposes as both the alignment reference surface and the final projection surface for the oscillating mirror. This multi-functionality eliminates the need for separate alignment components.
Solution Approach 2:
The oscillating mirror system itself provides the means for its own phase alignment through the reflection of the projected light strip. By observing the position and shape of the reflected light spot on the projection plane, the system can self-diagnose and self-adjust its phase difference without requiring external alignment equipment or additional sensors.
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 provides a simple, high-precision phase alignment solution for oscillating mirrors, eliminating the need for extra optical or electrical components and enhancing the accuracy of beam switching and brightness control.
Implementation Method 1
the laser beam emitted by the laser light source is reflected by the oscillating mirror to form a continuous scan line segment on the projection plane
Implementation Method 2
micro-galvanometer devices that are excited by pulsed voltage and driven by a periodic electrostatic field
Implementation Method 3
micro galvanometer devices that are driven by pulsed current and driven by a periodic magnetic field
Data Source
AI summary
The present invention discloses a phase alignment system and method of oscillating mirror. The present invention utilizes the reciprocating scanning symmetry feature of the simple harmonic oscillation motion of the oscillating mirror to construct scanning pattern data with complementary pixel brightness and darkness. When the phase difference parameter applied by the scan controller is consistent with the actual phase of simple harmonic oscillation of the oscillating mirror, the scanning pattern data with complementary pixel brightness and darkness and the reciprocating motion of the oscillating mirror are accurately matched, and a perfect stitched continuous scanning line with uniform brightness is obtained on the projection plane, thereby achieving the effect of being clearly distinguishable, easy to detect, and convenient for alignment operation.