Shear Test Tool Calibration with Resilient Pivot Mechanism

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Solution Overview

Problem

Conventional shear test tools for interconnect bonds in electronic devices face issues with bearing friction leading to reduced lifespan, unreliable calibration results, and increased maintenance due to wear, tear, rust, and corrosion, which affect the accuracy and reliability of bond strength measurements.

Innovation Solution

A shear test tool calibration apparatus using a resilient pivot mechanism, such as a cross spring pivot mechanism, replaces bearing pivots to eliminate friction and maintain calibration accuracy over time, reducing maintenance needs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If bearing pivots are used to form a pivot between fixed element and pivotable element, then the pivotable element can rotate to conduct calibration, but bearing friction causes wear and tear reducing lifespan and calibration reliability

Engineering Contradiction:

Improvecalibration reliabilityVSAvoidbearing lifespan

Core Design Contradiction:

ReliabilityVSDuration of action of moving object

Solution Approach 1:

The patent replaces the mechanical bearing pivot system with a magnetic field-based pivot mechanism. The fixed element contains a magnet that generates a magnetic field, causing the pivotable element (which has magnetic properties) to rotate in response to applied forces without physical contact. This substitution eliminates mechanical friction and wear, resolving the contradiction between reliability and lifespan.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If bearing pivots are used for calibration, then calibration can be conducted, but bearing friction varies with different weights leading to inaccurate calibration results

Engineering Contradiction:

Improvecalibration accuracyVSAvoidcalibration reliability

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

By replacing the mechanical bearing contact with magnetic field interaction, the patent eliminates variable friction that occurs with different weights. The magnetic pivot mechanism provides consistent, frictionless rotation regardless of the weight applied, ensuring accurate and reliable calibration measurements across all test conditions.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Strength

If iron-containing bearing components are used, then structural strength is provided, but components become rusted and corroded over time requiring maintenance

Engineering Contradiction:

Improvebearing strengthVSAvoidmaintenance effort

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The patent replaces iron-containing mechanical bearing components with magnetic components that do not require physical contact. Since the pivotable element rotates through magnetic field interaction rather than mechanical contact, there is no friction-induced wear, rust, or corrosion, eliminating the need for lubricants and maintenance while maintaining structural integrity through magnetic field strength.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Force

If lubricants are used to reduce friction and rust in bearing pivots, then friction is reduced, but maintenance effort and costs increase

Engineering Contradiction:

Improvefriction reductionVSAvoidmaintenance cost

Core Design Contradiction:

ForceVSEase of manufacture

Solution Approach 1:

The patent eliminates the need for lubricants by replacing the mechanical bearing system with a magnetic field-based pivot mechanism. The frictionless magnetic interaction provides the same force reduction benefits as lubricants would, but without the ongoing maintenance requirements and costs associated with lubricant application and monitoring.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 resilient pivot mechanism enhances the lifespan and reliability of the calibration apparatus, providing more accurate and consistent bond strength measurements without the need for lubricants, thus reducing maintenance costs and improving long-term performance.

Implementation Method 1

a resilient pivot mechanism coupled between the fixed element and the pivotable element to form a pivot such that the pivotable element is rotatable about the pivot

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

The cross spring pivot mechanism may be formed by a first spring sheet having an opening and a second spring sheet which is sized to pass through the opening of the first spring sheet, the first and second spring sheets being arranged at an angle to each other

Methodology Applied

Scientific EffectSpring mechanism: Spring

Data Source

PatentUS12442744B2Apparatus and method for calibrating a shear test tool

Publication Date: 2025.10.14 ASMPT SINGAPORE PTE LTD

AI summary

An apparatus for calibrating a shear test tool utilizes a resilient pivot mechanism to improve accuracy and reliability of the force calibration. The apparatus includes a fixed element, a pivotable element configured to be rotatable relative to the fixed element, and a resilient pivot mechanism coupled between the fixed element and the pivotable element to form a pivot. The pivotable element is rotatable about the pivot to lift a weight coupled to the pivotable element when the shear test tool applies a force on the pivotable element in order to rotate the pivotable element and lift the weight.