Wire Tensioner Flow Contraction for Bonding Stability
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Solution Overview
Problem
Conventional wire tensioners in wire bonding apparatuses face issues with wire wobbling due to insufficient restriction of compressed gas flow at the lower end, leading to disturbances that affect bonding arm alignment and oxidation protection, and require complex vacuum suction configurations.
Innovation Solution
A wire tensioner design with multiple flow contraction portions and outlets in the wire passage, where compressed gas is supplied through a tubular unit, effectively restricting gas flow to both the spool and bonding tool sides, reducing jet flow and minimizing disturbances, and incorporating an oxidation protection unit to prevent oxidation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If vacuum suction is used to restrict compressed gas flow, then wire stability is improved, but the device complexity increases due to requiring a vacuum feeding source
Solution Approach 1:
The wire passage itself provides flow restriction functionality through its built-in flow contraction portions, eliminating the need for external vacuum suction devices. The passage structure serves dual purposes: guiding the wire and restricting compressed gas flow, thereby simplifying the overall device by removing the vacuum feeding source.
Solution Approach 2:
The vacuum suction function is extracted and replaced by the flow contraction portions integrated into the wire passage. Instead of using a separate vacuum system, the flow restriction capability is taken out and implemented directly within the wire passage structure through geometric constraints.
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 design suppresses wire wobbling and oxidation risks by reducing the downward jet flow, enhancing positional accuracy and stability in wire bonding, while maintaining a simple structure without the need for a vacuum feeding source.
Implementation Method 1
a fluid resistance of the compressed fluid that flows through the wire passage applies the wire with back tension
Implementation Method 2
the wire passage also includes flow contraction portions having a smaller diameter than that of the inlet and the outlet. The flow contraction portions are respectively provided on the capillary side of the inlet and on the wire spool side of the outlet. As the flow contraction portions restrict passing of the compressed fluid, a flow of the compressed fluid from the inlet to the outlet is formed within the wire passage
Implementation Method 3
the wire below the wire tensioner wobbles due to a jet flow of the compressed gas discharged through the lower end of the wire passage
Data Source
AI summary
A wire tensioner has a wire passage through which a wire is inserted. The wire passage include: an inlet through which a compressed gas enters; a first outlet through which the compressed gas is discharged and is provided on an upper side of the inlet; a first flow contraction portion provided on the upper side of the inlet, and for contracting an area of the wire passage; a second flow contraction portion provided on a lower side of the inlet, and for contracting the area of the wire passage; a third flow contraction portion provided on a side of a bonding tool of the second flow contraction portion, and for making the flow of the compressed gas to the side of the bonding tool contracted; and a second outlet through which the compressed gas is discharged and is provided on the lower side of the second flow contraction portion.