High-Contrast Laser Marking on Integral Heat Spreaders
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Solution Overview
Problem
The readability of identification marks on IC packages with microtopographical features is compromised due to insufficient contrast with the background, affecting manufacturing processes and product traceability, especially for automated optoelectronic imaging systems.
Innovation Solution
A method involving a two-stage laser process to resurface the metallic substrate, smoothing the marking area by melting and redistributing elevated features and filling depressions, followed by engraving a high-contrast mark using specific laser parameters to enhance reflectivity and readability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If marks are formed on surfaces with microtopographical features, then identification tracking is enabled, but readability and contrast are diminished
Solution Approach 1:
The patent applies a preliminary laser treatment to the substrate surface before mark formation. This pre-treatment creates a controlled microtopographical pattern that enhances light scattering, thereby improving the contrast and readability of subsequent marks. The preliminary action modifies the surface properties to ensure optimal mark visibility while maintaining product traceability.
Solution Approach 2:
The patent utilizes optical property changes in the substrate material through laser irradiation. The laser treatment induces localized changes in the substrate's optical characteristics, creating areas with enhanced light interaction. This results in improved contrast between the mark and background, making marks more readable without compromising traceability.
2Illumination intensity
If microtopographical features are present on the surface, then light scattering occurs, but mark contrast and recognition are reduced
Solution Approach 1:
The patent applies laser treatment locally to specific areas of the substrate surface where marks will be formed. This localized treatment creates controlled microtopographical features only in the marking zones, enhancing light scattering and contrast precisely where needed. The rest of the substrate maintains its original properties, ensuring that mark recognition is improved without unnecessary modifications elsewhere.
Solution Approach 2:
The patent modifies the optical parameters of the substrate surface through controlled laser irradiation. By adjusting laser power, pulse duration, and scan speed, the treatment optimizes light scattering properties in the marking areas. This parameter control enhances mark contrast by creating optimal optical conditions for light interaction with the mark features.
3Ease of manufacture
If conventional laser marking is used on rough surfaces, then marking process is simple, but automated imaging system readability is poor
Solution Approach 1:
The patent introduces a preliminary laser surface treatment step before conventional mark formation. This pre-treatment automatically creates optimal surface conditions for mark readability, enabling automated imaging systems to accurately capture mark information. The two-stage process maintains manufacturing efficiency while significantly improving automated recognition capabilities.
Solution Approach 2:
The patent replaces mechanical surface preparation methods with laser-based treatment. Instead of mechanical polishing or etching, the laser automatically modifies the surface optical properties through non-contact irradiation. This substitution maintains process simplicity while dramatically improving mark readability for automated imaging systems.
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 significantly improves the readability of marks by creating a high-contrast surface that can be accurately read by both human eyes and automated systems, enhancing manufacturing efficiency and product traceability.
Implementation Method 1
smoothing the marking area by melting and redistributing elevated features and filling depressions
Implementation Method 2
engraving a high-contrast mark using specific laser parameters
Implementation Method 3
enhance reflectivity and readability
Data Source
AI summary
As part of a first configured laser operation, a smooth, more reflective marking area is formed at a surface of a substrate (e.g., integral heat spreader, or IHS). In a second configured laser operation, a mark is formed at the surface of the substrate within the marking area. The mark contrasts strongly with the reflective surface of the substrate in the marking area. As a result, the mark may be read with an optoelectronic imaging system with a higher rate of reliability than marks disposed at a substrate surface having a microtopographical profile with greater variation from a nominal surface plane. An IHS with a mark so disposed provides benefits when include as a portion of an integrated circuit package, which in turn provides benefits when included as a portion of an electronic system.