Bonding Electronics to Rough Substrates via Insulating Adhesive Pads
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Solution Overview
Problem
Conventional methods for bonding electronic components on substrates with rough surfaces, such as textiles, face issues with wire connection failures, high costs, and time-consuming manual processes, making it difficult to scale to automatic manufacturing.
Innovation Solution
The method involves creating a smooth pad on the substrate using an insulating adhesive, forming conductive traces, and using anisotropic conductive materials to bond electronic components, ensuring reliable electrical connections while maintaining substrate flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual bonding processes with conductive epoxy and wire bonding are used on rough substrates, then electronic components can be bonded to fabric substrates, but wire connections fail frequently resulting in poor yield and lifespan
Solution Approach 1:
The patent removes the wire bonding step entirely from the bonding process. Instead of using wires to connect electronic components to the substrate, the invention directly bonds the component pads to the substrate using conductive adhesive, eliminating the source of wire connection failures and improving both reliability and manufacturing yield.
Solution Approach 2:
The patent changes the bonding parameters by using conductive adhesive with specific rheological properties that allow it to flow into the rough fabric substrate pores and form reliable electrical connections. The adhesive formulation and application parameters are optimized to ensure proper wetting and bonding without requiring wire intermediaries.
2Ease of manufacture
If manual bonding processes are used, then electronic components can be bonded to substrates, but the process is costly and time consuming
Solution Approach 1:
The patent combines multiple manual steps (adhesive application, component placement, and bonding) into a single automated pick-and-place bonding operation. The conductive adhesive is applied and the component is bonded in one automated process step, dramatically reducing manufacturing cycle time and enabling scalable production.
Solution Approach 2:
The patent replaces manual mechanical bonding operations with automated pick-and-place bonding equipment. This substitution of manual mechanical processes with automated systems reduces labor costs, increases precision, and enables high-volume manufacturing while maintaining bonding quality.
3Manufacturing precision
If conductive epoxy is manually disposed on fabric and chip, then wire bonding can be performed, but the process lacks precision and consistency
Solution Approach 1:
The patent applies conductive adhesive to the substrate in advance before component placement, allowing the adhesive to properly wet and penetrate the fabric substrate. This preliminary adhesive application ensures consistent bonding conditions and precise electrical connections when the component is subsequently placed and bonded.
Solution Approach 2:
The conductive adhesive serves as an intermediary material between the fabric substrate and the electronic component pads. This intermediary layer compensates for the rough substrate surface, ensures reliable electrical contact, and simplifies the overall bonding process by eliminating the need for separate wire bonding operations.
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 enhances the reliability and efficiency of bonding electronic components to rough surfaces, reducing yield and lifespan issues, and enabling cost-effective, automated manufacturing processes.
Implementation Method 1
applying heat and pressure to the insulating adhesive to cause the adhesive to flow into at least one opening formed in the substrate
Implementation Method 2
applying heat and pressure to the insulating adhesive to cause the adhesive to flow into at least one opening formed in the substrate
Implementation Method 3
bonding the electronic component to the substrate by curing the anisotropic conductive material
Data Source
AI summary
Systems and methods for bonding an electronic component to substrate with a rough surface. The method comprising: disposing an insulating adhesive on the substrate; applying heat and pressure to the insulating adhesive to cause the adhesive to flow into at least one opening formed in the substrate; curing the insulating adhesive to form a pad that is at least partially embedded in the substrate and comprises a planar smooth surface that is exposed; disposing at least one trace on the planar smooth surface of the pad; depositing an anisotropic conductive material on the pad so as to at least cover the at least one trace; placing the electronic component on the pad so that an electrical coupling is formed between the electronic component and the at least one trace; and bonding the electronic component to the substrate by curing the anisotropic conductive material.