Aspherical Paraboloid Reflector for 3D Printer Beam Uniformity
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Solution Overview
Problem
Existing beam directors for 3D printers cause beam distortion due to differences in focal lengths between the x and y axes when using a conical reflector, resulting in an elliptical beam shape at the work surface instead of maintaining collimation in both directions.
Innovation Solution
A beam director with a rotatable first reflector and a second annular reflector formed as a paraboloid, along with a beam corrector, ensures the beam maintains equal dimensions in both directions by adjusting the curvature and asphericity of the reflective surface to achieve a 90° deflection without focal point disparities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conical reflector is used to redirect the beam at 90 degrees, then the beam direction is changed effectively, but the beam shape becomes distorted with different focal lengths in x and y directions
Solution Approach 1:
The conical reflector is modified to have an aspherical surface with different curvatures in orthogonal directions. The reflector surface is shaped with a first curvature in the x-direction and a second curvature in the y-direction, allowing independent control of focal lengths to maintain beam uniformity while achieving 90-degree redirection
Solution Approach 2:
The reflector surface is designed with non-uniform local properties - different curvatures at different locations and in different directions. This allows the surface to correct beam distortion locally in the x-direction while maintaining proper redirection, addressing the specific problem of beam shape uniformity without compromising redirection efficiency
2Adaptability or versatility
If a rotating flat mirror or arcuate mirror is used, then the beam can be reflected along straight or arcuate paths, but additional optical components are required which increases system complexity
Solution Approach 1:
The beam redirection function and beam shaping function are merged into a single aspherical reflector component. This eliminates the need for separate correcting lenses or additional mirrors, reducing system complexity while maintaining the ability to redirect the beam along the desired path
Solution Approach 2:
The aspherical reflector performs multiple functions simultaneously: it redirects the beam at 90 degrees, corrects beam shape distortion, and maintains uniform focal lengths in both x and y directions. This multi-functionality reduces the total number of components needed in the system
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 ensures a collimated beam with equal dimensions in both directions reaches the work surface, reducing distortion and aberration, and eliminates the need for additional lenses, thereby simplifying system calibration and reducing aberrations.
Implementation Method 1
a first reflector rotatable about a longitudinal axis for receiving a beam from a beam source along the longitudinal axis, the first reflector including a reflective surface at an acute angle to the longitudinal axis for reflecting the beam
Implementation Method 2
a second annular reflector around the longitudinal axis of first reflector as first reflector rotates, configured to reflect the beam towards a work surface at a constant angle thereto, the second annular reflector being formed as a paraboloid such that the beam has the same dimension in the first and second directions when incident on the work surface
Data Source
Figure 1~2
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AI summary
A beam director for use in 3D printers comprises a first mirror rotating about its longitudinal axis for redirecting a beam onto a second mirror and then onto a work surface, which may result in a beam with a distorted elliptical shape. A beam corrector, e.g. a lens or a reflective surface, is used to ensure the beam has the same dimensions in first and second perpendicular directions.