Corrosion Detection Pattern for Electronic Apparatus
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Solution Overview
Problem
Electronic apparatuses face corrosion issues due to exposure to high humidity environments containing sulfur compounds, leading to creep corrosion, which can cause short circuits and device malfunctions.
Innovation Solution
An electronic apparatus is designed with a corrosion detection pattern comprising a first and second wiring pattern, exposed to the atmosphere, and a power supply circuit that applies voltage periodically to detect current flow between the patterns, triggering an alert when a short circuit occurs, thus preventing corrosion failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective layer is provided on metal wiring to prevent corrosion, then corrosion resistance is improved, but detection of early-stage corrosion becomes difficult
Solution Approach 1:
The patent divides the detection function into two parts: a detection pattern exposed to the environment that experiences corrosion first, and the actual wiring protected by a protective layer. The detection pattern acts as a sacrificial element that segments the corrosion risk from the functional wiring, allowing early detection without compromising the protected wiring's integrity.
Solution Approach 2:
The detection pattern serves as an intermediary between the corrosive environment and the protected wiring. It is positioned to experience corrosion effects first and transfer this information to the monitoring system through resistance changes, allowing indirect detection of corrosion conditions without exposing the critical wiring to the same risk.
2Measurement precision
If voltage is continuously applied to detect corrosion, then detection sensitivity is improved, but energy consumption increases and false positives from ion migration occur
Solution Approach 1:
The patent applies voltage periodically rather than continuously to the detection pattern. This periodic application allows corrosion detection at specific intervals while minimizing energy consumption and preventing ion migration that would occur with continuous voltage application. The system measures resistance changes during these periodic voltage pulses to detect corrosion without the harmful effects of continuous energization.
3Measurement precision
If the detection pattern is exposed to the atmosphere without protective layer, then corrosion detection sensitivity is improved, but the detection pattern itself becomes vulnerable to corrosion damage
Solution Approach 1:
The detection pattern is designed to experience corrosion in advance of the protected wiring. By intentionally exposing this sacrificial pattern to the corrosive environment first, the system detects corrosion conditions before they affect the critical functional wiring. The detection pattern serves as an early warning system that sacrifices itself to protect the overall system.
Solution Approach 2:
The detection pattern is designed as a disposable or sacrificial element that is less critical than the functional wiring. It is intentionally made vulnerable to corrosion so it can serve its detection purpose and be replaced or reset if needed, while the main wiring remains protected and durable.
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 apparatus effectively detects corrosion with high sensitivity before it leads to short circuits, allowing for timely intervention and preventing device malfunctions.
Implementation Method 1
a power supply circuit that applies a first voltage to the first wiring portion at periodic time intervals; and a current detection circuit that outputs an alert signal when a current flows through the second wiring pattern
Data Source
AI summary
An electronic apparatus includes a wiring board. The wiring board also includes a first wiring pattern that is provided on the wiring board and includes a first wiring portion extending in a first direction. The wiring board further includes a second wiring pattern that includes a second wiring portion extending in the first direction. The wiring also includes a first via provided on the first wiring portion, and a second via provided on the second wiring portion. A power supply circuit applies a first voltage to the first wiring portion at periodic time intervals. A detection circuit outputs an alert signal when a current flows through the second wiring pattern.