Slotted Substrate for Micro-Component Adhesive Bonding
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Solution Overview
Problem
Existing methods for attaching micro-components to substrates in integrated circuit and opto-electronic assemblies face challenges in achieving precise alignment and maintaining adhesive quality over time, particularly due to environmental changes, and struggle with controlling the thin bond line thickness and adhesive flow, limiting post-placement adjustments.
Innovation Solution
The use of slotted configurations on the substrate surface allows for precise adhesive application and retention, enabling self-centering alignment and controlled curing of micro-components, with optional channels for overflow adhesive containment and localized heating to manage adhesive viscosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thin bond line is used to improve lifetime stability, then the adhesive attachment quality improves, but the adhesive flow control becomes difficult due to friction-based restriction in the molecular flow regime
Solution Approach 1:
The bonding surface is segmented into multiple discrete bonding sites rather than a continuous large-area bond. This segmentation reduces the total adhesive volume required and minimizes friction-based flow restriction, enabling better control of adhesive flow while maintaining thin bond lines for improved lifetime stability.
Solution Approach 2:
The adhesive bonding characteristics are optimized locally at each bonding site rather than uniformly across the entire assembly. Each bonding site can have controlled adhesive application and curing conditions, allowing precise flow control and alignment adjustment while maintaining thin bond lines for reliability.
2Reliability
If a thin bond line is used to improve lifetime stability, then the adhesive attachment quality improves, but the post-placement adjustment capability is limited
Solution Approach 1:
The bonding process is made dynamic by allowing post-placement adjustment capability. The adhesive remains adjustable for a controlled period after application, enabling alignment refinements even with thin bond lines, before final curing locks the position for long-term stability.
Solution Approach 2:
Alignment adjustments are performed preliminarily during the adjustable period before final curing. This preliminary action allows optimization of component positioning while the adhesive is still pliable, ensuring both precise alignment and long-term stability once cured.
3Productivity
If multiple components are placed in close proximity, then the assembly density improves, but the adhesive flow control becomes difficult due to limited space for wick-stop trenches
Solution Approach 1:
The bonding area is segmented into multiple discrete bonding sites, each with its own controlled adhesive application. This eliminates the need for extensive wick-stop trenches between components, allowing high assembly density while maintaining precise adhesive flow control at each site.
Solution Approach 2:
Adhesive flow control is achieved by transitioning from planar wick-stop trenches to vertical or three-dimensional containment structures at each bonding site. This dimensional change allows effective adhesive containment in limited horizontal space, enabling close component placement without sacrificing flow control.
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 ensures accurate and stable attachment of micro-components with thin bond lines, reducing surface friction and enhancing joint strength while allowing for precise alignment and adjustment, even in environments subject to temperature and humidity variations.
Implementation Method 1
The well defined by the walls is filled with an adhesive material system, such as epoxy
Implementation Method 2
reducing surface friction and allowing for the formation of thin bond lines
Implementation Method 3
localized heating to manage adhesive viscosity
Data Source
Figure 1
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Figure 4~5
AI summary
An arrangement for improving adhesive attachment of micro-components in an assembly utilizes a plurality of parallel-disposed slots formed in the top surface of the substrate used to support the micro-components. The slots are used to control the flow and "shape" of an adhesive "dot" so as to quickly and accurately attach a micro- component to the surface of a substrate. The slots are formed (preferably, etched) in the surface of the substrate in a manner that lends itself to reproducible accuracy from one substrate to another. Other slots ("channels") may be formed in conjunction with the bonding slots so that extraneous adhesive material will flow into these channels and not spread into unwanted areas.