Laser-Structured Substrate Cavities for Stronger Mechanical Anchoring
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Solution Overview
Problem
Existing methods for structuring substrates to enhance surface contact with other materials often fail to achieve strong mechanical adhesion due to limitations in increasing the contact surface area without intermediate materials, especially when weak interatomic or intermolecular bonds are formed.
Innovation Solution
A method involving a device with a light source, optical system, focusing means, and movement device to create patterns with negative conicity on the substrate surface, allowing for controlled etching with a focused outgoing light beam at an angle greater than 1°, promoting better mechanical anchoring of a second material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the contact surface between substrate and second material is increased by mechanical, chemical and/or optical means, then the mechanical performances of the assembly are improved, but the complexity of the structuring process increases
Solution Approach 1:
The patent replaces complex mechanical structuring systems with a laser-based optical system. The laser beam, controlled by galvanometric mirrors and focusing lenses, creates microstructures on the substrate surface without requiring mechanical contact or complex tooling, thereby improving mechanical performance while reducing process complexity
Solution Approach 2:
The patent modifies surface parameters by controlling laser beam parameters (power, pulse duration, scanning speed, focal position) to create specific microstructures. By changing these parameters, the system can produce different surface geometries (conical structures, grooves, pits) that enhance mechanical adhesion without increasing process complexity
2Strength
If the contact surface between substrate and second material is increased, then adhesion is improved, but when weak interatomic or intermolecular bonds are formed, good assembly cannot be obtained
Solution Approach 1:
The patent creates conical microstructures with curved surfaces on the substrate. These conical shapes with specific aperture angles (30-60 degrees) provide mechanical interlocking geometry that transforms weak molecular bonds into strong mechanical anchoring, ensuring reliable assembly even when interatomic bonds are inherently weak
Solution Approach 2:
The patent transitions from two-dimensional surface contact to three-dimensional mechanical interlocking by creating conical structures that extend into the substrate depth. This dimensional transformation allows the second material to mechanically anchor within the conical cavities, significantly enhancing adhesion strength beyond simple surface contact
3Shape
If focused outgoing light beam etches pattern from upper surface of substrate, then structured patterns with negative conicity are formed, but the cavity should be non-through between upper and lower surfaces
Solution Approach 1:
The patent employs feedback control through real-time monitoring of laser processing parameters and substrate position. The galvanometric mirror system and focusing mechanism are dynamically adjusted based on feedback signals to maintain precise control over etching depth, ensuring cavities remain non-through while achieving the desired negative conicity shape
Solution Approach 2:
The patent uses dynamic control of the laser beam parameters and substrate positioning during the etching process. By dynamically adjusting pulse duration, power, and scanning speed, the system can precisely control cavity formation to achieve negative conicity while stopping before penetrating through the substrate, maintaining manufacturing precision
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 enables the creation of substrates with improved mechanical properties, such as tensile, shear, and peel strength, by forming structured patterns that enhance the adhesion of a second material, even on large surfaces, with finer groove dimensions and controlled etching angles.
Implementation Method 1
a light source for generating a structuring incoming light beam capable of machining the upper surface of the substrate
Implementation Method 2
generating from the incoming light beam as it passes through the optical system, then through the focusing means, a focused outgoing light beam
Data Source
AI summary
Method for structuring a substrate (11) and comprising the following steps: —providing a device (100) comprising a light source (33), an optical system (2) for obtaining an outgoing light beam (7) spatially offset in relation to the incoming light beam (1), and capable of modifying this spatial offset, focusing means (9) for focusing the outgoing light beam (7), a substrate holder (59), a movement device (60) for generating a movement (41) between the outgoing light beam (7) and the substrate (11); —providing and placing the substrate (11) on the substrate holder (59); —etching the substrate with the focused outgoing light beam (7) having an angle of attack (107) greater than 1° for any spatial offset between outgoing light beam (7) and incoming light beam (1) imposed by the optical system (2).