Laser Iridescent Surface Patterning for Uniform Large-Area Finishes
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Solution Overview
Problem
Current laser treatment methods for achieving an iridescent effect on large stainless-steel surfaces face challenges such as non-homogeneous treatment, visibility of junction zones between optical fields, and directionality of the iridization effect, leading to productivity and aesthetic issues.
Innovation Solution
A method involving the use of ultrashort pulse lasers with overlapping optical fields arranged in a random or periodically organized random pattern, along with varying polarization angles between lines, to create a seamless and uniform iridescent effect across larger surfaces, minimizing the visibility of junction zones and enhancing productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple optical fields are used to treat large surfaces, then productivity and treatment area are improved, but junction zones between fields become visible and treatment homogeneity deteriorates
Solution Approach 1:
The treatment area is divided into multiple optical fields that are juxtaposed to cover large surfaces. Each optical field is treated as an independent segment that can be optimized separately, while the overall arrangement is designed to minimize visible junctions between segments.
Solution Approach 2:
Different regions of the surface receive different treatment characteristics. Junction zones between optical fields are positioned and arranged to have different properties than the central regions, with random or periodically organized random patterns designed to minimize visibility of these local variations.
2Area of stationary object
If optical fields are arranged in a regular pattern, then treatment coverage is improved, but junction zones remain visible and aesthetic quality deteriorates
Solution Approach 1:
The optical fields are arranged in an asymmetric, non-uniform pattern rather than a simple regular grid. The junction zones are positioned at random or periodically organized random locations, creating an asymmetric distribution that prevents regular, visible patterns from forming across the treated surface.
Solution Approach 2:
The arrangement transitions from a simple two-dimensional grid to a more complex spatial distribution that incorporates random or periodically organized random positioning. This adds a dimensional complexity that disrupts the visibility of junction zones while maintaining comprehensive coverage.
3Manufacturing precision
If laser treatment is performed on stainless steel surfaces, then iridescent effect and surface modification are achieved, but directionality of the effect limits aesthetic versatility
Solution Approach 1:
The laser treatment is applied in periodic pulses to create the iridescent effect. The periodic nature of the laser pulsing, combined with the periodic organization of random patterns, creates a structured yet versatile aesthetic effect that can be viewed from multiple directions.
Solution Approach 2:
The treatment parameters (such as pulse duration, energy density, and scanning speed) are varied to create different iridescent effects. By changing these parameters, the same basic treatment process can produce a range of aesthetic outcomes, increasing versatility without requiring fundamentally different treatment methods.
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
This approach allows for the treatment of larger surfaces with improved homogeneity and reduced visibility of junction zones, achieving a more uniform and omnidirectional iridescent effect, suitable for industrial-scale applications.
Implementation Method 1
If the energy of the beam is too high, an ablation phenomenon via vaporization/sublimation/shock wave can take place
Implementation Method 2
irradiating the surface of a material with pulsed laser radiation of short pulse duration (less than one nanosecond)
Implementation Method 3
this periodic surface organization allows an induced phenomenon, well known to operators of laser surface treatment, which is diffraction of light through the creation of an optical network
Implementation Method 4
it also allows modifications of surface wettability as well as resistance to friction and a reduction in bacterial adherence
Data Source
AI summary
A method for creating an iridescent effect on a surface through formation of wavelets on the source can include using a pulse of laser beams sent to the surface in juxtaposed optical fields of a focusing system. A scanner scans the surface using laser beams along a series of lines that follow each other in a relative direction of travel of the part and of the scanner and a series of lines that lie in continuation of each other in a direction perpendicular to the relative direction of travel. The optical fields overlap in an overlapping area having a width that is twice the diameter of the pulse laser beam up to 2 cm. Two lines lying in continuation of each other overlap at a junction and between the two series of lines follow each other in a relative direction of travel of the part and the scanner.