Wire Tension Adjustment by Airflow Feedback in Wire Bonding
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Solution Overview
Problem
The existing wire bonding apparatus faces challenges in easily adjusting wire tension after the wire tensioner is incorporated, as it requires removing and reattaching components for tension adjustment, which is time-consuming and labor-intensive.
Innovation Solution
A method that includes a bonding arm with a wire clamper, a wire tensioner, an airflow detector, and a height position detector, where air flow rate is adjusted based on detected height positions to balance rotational moments, allowing for easy tension adjustment without disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wire tensioner is incorporated into the wire bonding apparatus, then the wire tension can be applied during bonding, but the tension adjustment becomes difficult requiring removal and reattachment of components
Solution Approach 1:
The wire tensioner uses its own airflow system to automatically indicate the correct tension setting. By observing the airflow direction (upward or downward) during wire bonding operation, the system self-regulates to achieve proper wire tension without requiring external measurement devices or component removal.
Solution Approach 2:
The system provides visual feedback through airflow direction indication. The airflow detector monitors the airflow generated by the wire tensioner and provides visual indication (upward or downward flow) that feedbacks to the operator about the current tension state, enabling real-time adjustment while the tensioner remains installed.
2Measurement precision
If the electronic balance is used to measure wire tension, then the tension can be accurately measured, but the adjustment process becomes time-consuming and labor-intensive
Solution Approach 1:
The patent replaces the mechanical electronic balance measurement system with a pneumatic airflow-based indication system. Instead of using a mechanical scale to measure wire tension, the system uses airflow direction and magnitude to indicate tension levels, eliminating the need for complex measurement equipment and reducing adjustment time.
Solution Approach 2:
The airflow detector acts as an intermediary between the wire tensioner and the operator. Rather than directly measuring wire tension with a balance, the system uses airflow as an intermediate indicator that correlates with wire tension, providing a simpler and faster measurement method.
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 method enables precise and efficient adjustment of wire tension within the wire bonding apparatus, reducing the time and effort required for tension adjustment and ensuring accurate wire loop formation.
Implementation Method 1
By causing air to flow upward through the wire passage and pulling the wire upward with the upward airflow, the tension is applied to the wire
Implementation Method 2
a spring member, generating a rotational moment in a direction opposite to a rotation direction of the bonding arm
Data Source
AI summary
Provided is a wire tension adjuster (60) that adjusts tension (T) applied to a wire (18) of a wire bonding apparatus (100). In the wire tension adjuster (60), in a state in which the wire (18) is gripped by a wire clamper (17), air is supplied to a wire tensioner (40) and a height position (H) of a tip (14f) of a bonding arm (14) is detected, and a flow rate (G) of the air supplied to the wire tensioner (40) is adjusted based on the height position (H) detected, thereby adjusting the tension (T) applied to the wire (18).