Wire Bonding Arm Pressure Sensor Integration
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Solution Overview
Problem
Existing wire bonding apparatuses require disassembly, reassembly, and load calibration of pressure sensors every time the ultrasonic horn is replaced, limiting mechanism design freedom and magnification factor for capillary pressing load detection.
Innovation Solution
A wire bonding apparatus with a pressure sensor integrated within the bonding arm, secured by pressure screws that also function as horn securing screws, allowing the sensor to remain in place during ultrasonic horn replacement and providing a balanced supporting point at the center of gravity to reduce vibrations and unnecessary loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pressure sensor is provided at the connection part between the ultrasonic horn and the bonding arm, then the pressing load can be detected, but the pressure sensor must be removed and reinstalled every time the ultrasonic horn is replaced, resulting in poor working performance
Solution Approach 1:
The patent divides the pressure sensing function from the ultrasonic horn assembly by placing the pressure sensor in a dedicated sensor hole in the bonding arm, separate from the horn connection interface. This segmentation allows the horn to be replaced independently without affecting the pressure sensor, resolving the contradiction between maintaining detection capability and improving replacement efficiency.
2Measurement precision
If the pressure sensor is provided between component parts with different functions, then the pressing load can be detected, but the position is limited and mechanism design freedom is reduced
Solution Approach 1:
The patent utilizes the bonding arm structure as a carrier for the pressure sensor, transitioning from placing the sensor only at the horn connection interface to embedding it within the bonding arm body. This dimensional relocation provides multiple possible positions (sensor holes can be placed at different locations in the bonding arm), thereby increasing mechanism design freedom while maintaining detection accuracy.
3Measurement precision
If the pressure sensor is provided between component parts with different functions, then the pressing load can be detected, but the magnification factor for the capillary pressing load is limited
Solution Approach 1:
By relocating the pressure sensor to the bonding arm and providing multiple sensor hole positions, the patent enables adjustment of the magnification factor through parameter changes in the mechanical lever arm ratios. Different sensor positions relative to the bonding arm pivot point and horn connection point create different mechanical advantage ratios, allowing optimization of the magnification factor for capillary pressing load detection.
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 design enhances mechanism design freedom, eliminates the need for pressure sensor recalibration, and ensures precise load control with reduced component parts and minimized vibrations during high-speed operation.
Implementation Method 1
a pressure sensor for detecting a pressing load applied by the capillary part
Implementation Method 2
an ultrasonic vibrator part
Data Source
AI summary
A wire bonding apparatus including a bonding arm provided at a tip end thereof with an ultrasonic horn that has a capillary at its tip end, wherein the bonding arm is provided therein with a pressure sensor that detects the pressing load applied by the capillary on a workpiece when bonding is executed. The bonding arm has a supporting point which is a thin-connecting portion and located at a height which is the same as the height of the center of gravity of a part formed by the capillary, ultrasonic horn body portion, ultrasonic vibrator, ultrasonic horn connecting portion, etc., and at a point where a balance between inertial mass including the capillary, ultrasonic horn body part, ultrasonic horn connecting portion, horn securing screws and pressure screws and inertial mass of the ultrasonic vibrator is maintained, when the bonding arm is turned about a bonding arm supporting shaft.