Joint Portion Capacitance Evaluation for Form-Independent Bond Assessment
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Solution Overview
Problem
Conventional joint portion evaluating methods face challenges in accurately evaluating joint states due to form differences, leading to errors from high-frequency alternating current signals and adverse signal-to-noise ratios.
Innovation Solution
A joint portion evaluating method and device that utilize capacitance measurements by applying alternating current signals with controlled frequencies and temperatures to derive measurement evaluation values, canceling the effect of form differences through capacitance value referencing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high-frequency alternating current signal is applied for joint portion evaluation, then measurement speed is improved, but measurement precision deteriorates due to form difference errors and low signal-to-noise ratio
Solution Approach 1:
The patent changes the measurement parameter from high-frequency alternating current to capacitance measurement. By measuring capacitance values at different temperatures (reference temperature and measurement temperature) and deriving evaluation values from the change, the method achieves both fast measurement and high precision while eliminating form difference errors.
2Ease of operation
If capacitance measurement is performed at single temperature, then measurement simplicity is improved, but measurement precision deteriorates due to form difference effects
Solution Approach 1:
The patent performs preliminary measurement at a reference temperature to obtain a baseline capacitance value before conducting the actual measurement at the target temperature. This preliminary action allows the system to cancel out form difference effects by comparing the reference capacitance with the measurement capacitance, thereby achieving high precision without complicating the measurement process.
Solution Approach 2:
The patent uses the capacitance value measured at reference temperature as feedback to correct the measurement at the target temperature. By deriving the evaluation value from the change in capacitance between the two temperatures, the system automatically compensates for form differences and achieves accurate evaluation.
3Productivity
If alternating current frequency is increased to improve measurement efficiency, then productivity is improved, but measurement precision deteriorates due to increased error factors from form variations
Solution Approach 1:
The patent fundamentally changes the measurement parameter from high-frequency electrical characteristics to capacitance measurement. This parameter change enables efficient measurement (comparable to high-frequency methods) while eliminating the sensitivity to form variations that plagues high-frequency alternating current methods, thereby achieving both high productivity and high precision.
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
Enables accurate evaluation of joint states, even with form variations, by using capacitance values to assess joint integrity and detect weak bonds effectively.
Implementation Method 1
a pair of electrodes disposed to form a capacitor at the joint portion; and a control unit that measures a capacitance value of the joint portion
Data Source
AI summary
A joint portion evaluating method for measuring and evaluating a joint state of a joint portion at which a first joint body and a second joint body are joined together, the joint portion evaluating method including the steps of: acquiring as a reference value a capacitance value of the joint portion in a reference measurement state serving as a reference for measurement conditions; changing a measurement state from the reference measurement state and acquiring as a measured value a capacitance value of the joint portion in a changed measurement state arising after the change of the measurement state; deriving as a measurement evaluation value a value obtained by referencing the measured value with the reference value; and performing an evaluation based on the derived measurement evaluation value.