Wire Clamp Calibration via Piezoelectric Feedback
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Solution Overview
Problem
The existing wire clamp devices in wire bonding apparatuses lack the ability to accurately confirm the absolute values of arm part opening amounts corresponding to the voltage applied to the piezoelectric element, leading to variability and instability in wire bonding due to changes in components over time.
Innovation Solution
A method is introduced to calibrate the wire clamp device by detecting the timing of the arm parts' closed state through electrical conduction or stress detection, allowing for the calibration of the driving voltage based on a reference voltage, ensuring accurate adjustment of opening amounts and stable wire bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed voltage is applied to the piezoelectric element to control the opening amount of arm parts, then the wire clamp device can operate with simple control, but the opening amounts vary for each device and over time due to component fluctuations
Solution Approach 1:
The patent implements feedback control by detecting the actual opening amount of the arm parts using a sensor (such as a strain gauge or position sensor) and adjusting the voltage applied to the piezoelectric element based on the detected value. The control unit compares the detected opening amount with a target opening amount and modifies the driving voltage to achieve the desired opening amount, thereby compensating for component fluctuations and ensuring consistent performance.
Solution Approach 2:
The patent changes the control parameter from a fixed voltage value to a dynamically adjusted voltage value based on actual device characteristics. By measuring the relationship between voltage and opening amount for each specific device and over time, the system adjusts the voltage parameter to maintain consistent opening amounts despite variations in piezoelectric element properties.
2Adaptability or versatility
If the piezoelectric element characteristics change over time or after attachment, then the device adapts to new conditions, but the opening amounts fluctuate and bonding reliability decreases
Solution Approach 1:
The patent performs preliminary calibration or measurement of the piezoelectric element characteristics after attachment to the main body. By detecting the relationship between voltage and opening amount in advance and storing this calibration data, the system prepares the correct control parameters before actual wire bonding operations, ensuring precision from the start even after component changes or reattachment.
Solution Approach 2:
The system continuously monitors the opening amount using sensors and adjusts the driving voltage in real-time to compensate for changes in piezoelectric element characteristics. This feedback mechanism ensures that despite adaptations to new conditions or component aging, the opening amount precision is maintained through dynamic correction.
3Device complexity
If no calibration method is provided, then the device structure remains simple, but accurate adjustment of opening amounts cannot be achieved
Solution Approach 1:
The patent replaces complex mechanical measurement and adjustment mechanisms with electrical sensing and control. Instead of using mechanical gauges or manual adjustment mechanisms, the system uses electrical sensors (such as strain gauges or position sensors) to detect opening amounts and electronically adjusts the piezoelectric element voltage, achieving high measurement precision with minimal additional hardware complexity.
Solution Approach 2:
The system performs self-calibration and self-adjustment using built-in sensors and control circuits. The wire clamp device automatically detects its own opening amounts and adjusts its own driving parameters without requiring external calibration equipment or complex adjustment mechanisms, thereby maintaining structural simplicity while achieving accurate measurement and control.
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 accurate and stable wire bonding by ensuring consistent opening amounts of the arm parts, improving the reliability of the wire bonding process.
Implementation Method 1
a drive part coupled to base ends of the pair of arm parts and provided with a piezoelectric element for driving opening and closing the tips of the pair of arm parts
Implementation Method 2
a piezoelectric element for detection that detects a stress generated in association with opening and closing of the pair of arm parts due to the piezoelectric element for driving
Data Source
AI summary
A method for calibrating a wire clamp device includes: preparing a wire clamp device provided with a pair of arm parts having tips for clamping a wire, the arms extending from the tips toward base ends, and a drive part provided with a piezoelectric element for drive, connected to the base ends of the pair of arm parts and opening/closing the tips of the pair of arm parts; a step of detecting, by electrical continuity between the tips, a timing at which the pair of arm parts enters a closed state when the piezoelectric element for drive is driven, and acquiring a reference voltage; and a step of calibrating, on the basis of the reference voltage, an application voltage to be applied to the piezoelectric element for drive. Thus, it is possible to perform accurate and stable wire bonding.