Concave Waveguide Geometry for Uniform Laser Plastic Welding
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Solution Overview
Problem
Existing waveguides for plastic welding suffer from high energy losses and non-uniform energy distribution, which can lead to inefficiencies in the welding process and increased tolerance issues between the waveguide and components.
Innovation Solution
The development of negative and positive waveguides with continuously curved concave inner faces, which guide laser light through a channel-like cavity or solid state, respectively, to minimize interaction between laser beams and enhance power density distribution, allowing for more efficient energy transfer and adaptation to varying seam contours.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional waveguides with straight or simple curved inner faces are used, then the structure is simple and easy to manufacture, but energy losses are high and power density distribution is non-uniform
Solution Approach 1:
The waveguide employs a continuously curved concave inner face instead of straight or simple curved surfaces. This specific curvature profile causes laser beams to follow a controlled path through the waveguide, reducing beam interaction and minimizing energy losses while maintaining a manufacturable structure.
Solution Approach 2:
The invention changes the geometric parameters of the waveguide inner face by implementing a continuously curved concave shape with specific radius variations. This parameter optimization enables better beam control and reduced energy losses without excessive structural complexity.
2Manufacturing precision
If conventional waveguides are used, then manufacturing is easier, but power density distribution at the welding seam is non-uniform
Solution Approach 1:
The continuously curved concave inner face is designed with specific geometric parameters that can be manufactured using modern CNC machining or molding techniques. The curvature profile is optimized to produce uniform power density distribution at the exit face while remaining feasible for industrial manufacturing.
3Adaptability or versatility
If waveguides with fixed geometry are used, then manufacturing is simpler, but tolerance compensation between waveguide and components is reduced
Solution Approach 1:
The continuously curved concave shape provides a geometric profile that is more tolerant to alignment variations and positioning errors. The gradual curvature changes help maintain beam control even when there are small deviations in waveguide-to-component positioning, thereby compensating for tolerances.
4Loss of energy
If waveguides with straight inner faces are used, then the structure is simpler, but interaction between laser beams is increased leading to higher energy losses
Solution Approach 1:
The continuously curved concave inner face is specifically designed to guide laser beams along a path that minimizes mutual beam interaction. The curvature causes beams to diverge slightly or follow separate trajectories, reducing energy losses from beam interference while maintaining structural feasibility.
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
These waveguides reduce energy losses and improve power density distribution at the welding seam, enabling more precise and efficient plastic welding with increased tolerance compensation and reduced process time.
Implementation Method 1
a first and a second inner face which are arranged between the entry end and the exit end, which are arranged opposite to each other and by means of which laser light can be reflected
Implementation Method 2
The waveguide has at that especially the object to homogenize the distribution of the laser light so that the energy of the laser light enters the components to be welded as uniformly as possible
Implementation Method 3
Positive waveguides consists of a solid state which guides laser light in the interior following the law of total internal reflection
Data Source
AI summary
A waveguide for plastic welding has an entry end, an exit end as well as a first and a second inner face arranged between the entry end and the exit end, which are arranged opposite to each other and by means of which laser light can be reflected. A first distance between the entry end and the exit end defines a length of the waveguide and a second distance between the first and the second inner face defines a thickness of the waveguide. The exit end may be arranged opposite to the entry end and a central plane of the waveguide may extend centrally from the entry end to the exit end. The first inner face comprises a continuously curved, concave shape so that a third distance between the first inner face and the central plane varies continuously from the entry end in the direction of the exit end.