Sub-surface Laser Marking on Plastic Housings
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Solution Overview
Problem
Conventional marking techniques for small electronic devices, such as handheld devices, lack the necessary accuracy and precision to create legible markings, which are essential for providing information like serial numbers, logos, and certifications on the outer housing surfaces.
Innovation Solution
A method involving a base structure coated with a transparent acrylic resin, where selective alterations are made to the inner surface using a laser to create sub-surface markings that are visible through the outer coating, ensuring durability and high resolution, even on plastic surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional ink printing or stamping is used for marking, then the process is simple and inexpensive, but the accuracy and precision are insufficient for small handheld devices
Solution Approach 1:
The patent replaces conventional mechanical stamping and ink printing processes with laser-based marking technology. The laser system uses optical energy to directly mark the housing surface, eliminating the need for mechanical contact and ink application. This substitution enables precise marking on small handheld devices while maintaining process efficiency through automated laser scanning and focusing mechanisms.
Solution Approach 2:
The patent employs laser parameters such as pulse duration, power, and wavelength to achieve high-precision marking. By adjusting these parameters, the system can control the depth, contrast, and resolution of markings on plastic housings. The laser beam parameters are optimized to create durable marks without damaging the surrounding material, resolving the contradiction between precision and process complexity.
2Reliability
If markings are made on the outer surface, then the process is straightforward, but the markings lack durability
Solution Approach 1:
The patent transitions from surface-level marking to subsurface marking by directing the laser beam through the transparent or translucent housing material. The laser energy is focused below the outer surface, creating marks within the bulk material. This dimensional shift provides both durability (since marks are embedded) and precision (through controlled laser focusing at specific depths).
Solution Approach 2:
The patent uses the housing material itself as an intermediary medium. The laser beam passes through the transparent housing material to reach the marking depth, and the material's optical properties enable precise energy deposition. This intermediary approach allows the marking process to achieve both durability through subsurface embedding and precision through optical control.
3Measurement precision
If markings are made at high resolution, then legibility is improved, but the process complexity increases
Solution Approach 1:
The patent employs dynamic laser scanning systems with movable mirrors or galvanometers that can rapidly change the beam position and orientation. This dynamic control enables high-resolution marking by precisely directing laser energy along complex paths. The system's flexibility allows it to adapt to different marking patterns and resolutions without requiring complex mechanical fixtures or multiple specialized devices.
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 allows for durable, high-resolution, and dark sub-surface markings that are visible from the outside, providing accurate information and customization options for electronic device housings while maintaining a smooth appearance.
Implementation Method 1
altering surface characteristics of selective portions of an inner surface of the base structure
Data Source
AI summary
Techniques or processes for providing markings on products are disclosed. In one embodiment, the products have housings and the markings are to be provided on sub-surfaces of the housings. For example, a housing for a particular product can include an outer housing surface and the markings can be provided on a sub-surface of the outer housing surface yet still be visible from the outside of the housing. Since the markings are beneath the surface of the housing, the markings are durable.