Insulated Wire Bonding EFO Without Free Air Ball
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Solution Overview
Problem
Insulated bond wires pose a challenge for reliable attachment to electrical contact pads due to the insulating material acting as a barrier, leading to poor electrical and physical connections and bond strength during the second bond formation.
Innovation Solution
The method involves holding the bond wire in a capillary, attaching the first end to a contact pad, performing an electric flame off (EFO) on the second end without forming a free air ball, and then bonding it to the second contact pad, effectively removing the insulation to ensure strong physical and electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If EFO is performed on second end without forming free air ball, then insulation is effectively removed for better connection, but traditional bonding process complexity increases
Solution Approach 1:
The patent applies local quality by differentiating the treatment of the two ends of the bond wire. The first end forms a free air ball for reliable attachment, while the second end undergoes EFO without free air ball formation to remove insulation. This localized differentiation optimizes each end's function: the first end prioritizes attachment reliability, while the second end prioritizes electrical connection quality after insulation removal.
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 enables reliable attachment of both ends of the bond wire to contact pads, preventing short circuits and ensuring robust connections, thereby enhancing the reliability and strength of the bond.
Implementation Method 1
performing an electric flame off (EFO) on the second end of the bond wire without forming a free air ball (FAB)
Implementation Method 2
electric flame off (EFO)
Data Source
AI summary
A method of attaching a bond wire to first and second electrical contact pads includes holding the bond wire in a capillary, wherein a first end of the bond wire extends out of an opening in the capillary, attaching the first end of the bond wire to the first electrical contact pad using a ball bonding technique, moving a second end of the bond wire toward the second electrical contact pad after the attachment of the first end of the bond wire, performing an electric flame off on the second end of the bond wire without forming a free air ball, and attaching the second end of the bond wire to the second electrical contact pad after the EFO on the second end of the bond wire.