Optical Scanning Device Parabolic Reflector Laser Machining
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Solution Overview
Problem
Existing laser machining devices experience uneven machining due to non-constant scanning speed of laser light, leading to size variations in overlap margins and resulting in poor machining quality.
Innovation Solution
An optical scanning device with a projector that radiates laser light at a non-constant speed, utilizing a reflector with a parabolic surface to maintain a constant scanning speed and perpendicular incidence angle, ensuring consistent machining lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the deflector is driven to rotate at a constant speed, then the angular movement speed of the laser light is constant, but the scanning speed of the laser light on the workpiece becomes non-constant, causing size variation in overlap margins and uneven machining
Solution Approach 1:
The patent applies dynamics by making the angular movement speed of the laser light variable rather than constant. The controller adjusts the angular speed dynamically based on the rotation angle of the deflector, specifically reducing the speed when the deflector is at positions away from the peak to compensate for the geometric effect of the arc-shaped mirror. This dynamic speed adjustment ensures that the scanning speed of the laser light on the workpiece remains substantially constant, thereby maintaining uniform overlap margins and achieving even machining throughout the scanning line.
2Ease of operation
If the deflector is driven to rotate at a constant speed, then the operation is simple, but the scanning speed of the laser light varies, leading to non-uniform machining quality
Solution Approach 1:
The patent implements feedback control where the controller receives information about the rotation angle of the deflector and automatically adjusts the angular movement speed accordingly. The controller is configured to reduce the angular speed when the deflector is at positions away from the peak and increase it when approaching the peak, based on feedback from the rotation angle sensor. This closed-loop feedback system maintains constant scanning speed and uniform machining quality while keeping the operation automated and relatively simple.
3Speed
If a motor with high mobility is used to drive the deflector, then the responsiveness is improved, but the scanning speed becomes non-constant due to the arc geometry, causing overlap margin variation
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the angular movement speed parameter of the laser light based on the rotation angle parameter of the deflector. The controller modifies the speed parameter in real-time according to the relationship between the deflector position and the resulting scanning speed. Specifically, the angular speed is reduced when the deflector is at positions away from the peak and increased when approaching the peak, compensating for the geometric effects of the arc-shaped mirror and maintaining consistent overlap margins throughout the scanning process.
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 achieves constant scanning speed and perpendicular incidence of laser light, improving machining efficiency and reducing unevenness in machining lines, thereby enhancing the overall quality of the patterning process.
Implementation Method 1
a reflector with a parabolic surface, the reflector being configured to reflect the laser light from the projector
Implementation Method 2
The projection center is positioned at a focal point of the parabolic surface
Data Source
AI summary
An optical scanning device includes: a projector configured to radiate laser light incident thereon while causing the laser light to make angular movement around a projection center, and a reflector with a parabolic surface, the reflector being configured to reflect the laser light from the projector. The projection center is positioned at a focal point of the parabolic surface. The projector radiates the laser light such that the greater a difference between a rotation angle of the laser light and a reference angle, the lower an angular speed of the laser light, the reference angle being the rotation angle of the laser light when the laser light reflects on a vertex of the parabolic surface. A laser machining device includes the optical scanning device, and is configured to cause the laser light from the reflector to fall on a workpiece to form a machining line.