Continuity Inspection Device Static Electricity Leakage

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Solution Overview

Problem

Existing continuity inspection devices for electric wires face challenges in measuring static electricity potential due to high internal impedance in surface electrometers, leading to static electricity accumulation in the wire after inspection, and are prone to deformation during insertion and withdrawal of probes.

Innovation Solution

A continuity inspection device with a first probe applying voltage to one end of the electric wire in a non-contact state, a second probe measuring the surface potential of the other end, and a reference electrode plate along the intermediate portion to facilitate static electricity discharge and leakage, ensuring accurate measurement and preventing accumulation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a surface electrometer with high internal impedance is used to measure static electricity potential, then measurement precision is improved, but static electricity accumulates in the electric wire after inspection

Engineering Contradiction:

Improvemeasurement precisionVSAvoidstatic electricity leakage

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

A reference electrode plate is introduced as an intermediary component between the electric wire and ground. The plate provides a controlled path for static electricity to discharge to ground potential, preventing accumulation while enabling accurate potential measurement through the high-impedance electrometer

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system changes the potential parameter of the reference electrode plate to a fixed lower potential (ground or near-ground). This creates a potential difference that allows the electrometer to measure static electricity potential accurately while the reference plate maintains a discharge path for static electricity

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If probes are inserted into and pulled out from terminals repeatedly, then inspection operation is enabled, but terminal deformation occurs

Engineering Contradiction:

Improveease of operationVSAvoidterminal deformation

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The patent replaces the mechanical contact system (physical probe insertion) with a non-contact measurement system. Probes measure terminal potential through electromagnetic field interaction without physical contact, eliminating mechanical stress and deformation while maintaining inspection capability

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The electric field serves as an intermediary between the probe and terminal. The probe detects potential through field interaction rather than direct contact, allowing measurement without mechanical insertion or withdrawal that would cause terminal deformation

Inventive Principle:

Principle #24Intermediary (Mediator)

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 precise measurement of static electricity potential without cross-talk influence and ensures easy leakage of static electricity, preventing accumulation and potential deformation issues during inspection.

Implementation Method 1

electric discharge of such a degree that electric arc is not generated is generated between one of the contacts and the terminal of one end of the electric wire by pulse voltage applied from the inspection device

Methodology Applied

Scientific EffectAir discharge: Corona Discharge

Implementation Method 2

in a state where potential of the reference electrode plate is fixed to potential lower than that of the voltage applied to the first probe, surface potential of the second terminal is measured through the second probe

Methodology Applied

Scientific EffectElectrostatic discharge: Electrostatic Discharge

Data Source

PatentUS9989577B2Continuity inspection device

Publication Date: 2018.06.05 YAZAKI CORP

AI summary

In this continuity inspection device, a reference electrode plate held at ground potential is disposed along an intermediate portion of electric wires to be inspected for continuity, and a discharge path (positive charge leaking path) for static electricity charged on the electric wires after the continuity inspection is secured by the reference electrode plate. Thus, accumulation of static electricity after the continuity inspection on electric wires is avoided. Moreover, the electric potential of the static electricity charged on the electric wires by application of voltage to power supplying probes is measured by measuring equipment as the absolute potential with respect to the ground potential of the reference electrode plate through the surface potential of the terminals of the electric wires. Thus, the electric potential of the static electricity of the electric wires is accurately measured without being affected by cross talk due to stray capacitance between the electric wires.