Sensor Module Silicone Resin Protective Member Corrosion Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Sensor modules used to detect temperature, atmospheric pressure, or humidity are prone to corrosion from contaminants like salt water, which can cause separation of bonding wires from electrode pads, leading to malfunction.
Innovation Solution
A sensor module design that includes a protective member made of silicone resin covering the electrodes and bonding wires, extending to the maximum curvature of the wires and contacting the sensor side surface, preventing corrosion and secure bonding between the sensor and substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the sensor module includes an opening for collecting gas from the external environment, then the sensor can detect temperature, atmospheric pressure or humidity, but contaminants such as salt water may enter the sensor through the opening and corrode the electrode pad
Solution Approach 1:
A protective member made of silicone resin is introduced as an intermediary substance between the contaminants and the electrode pads. This protective member covers the electrode pads and bonding wires while allowing the sensor to continue collecting gas through the opening, thus mediating between the need for environmental detection and the need for corrosion protection
Solution Approach 2:
The protective member is applied in advance to cover the electrode pads and bonding wires before contaminants can cause corrosion. This preliminary protective action prevents the harmful effects of salt water and other contaminants from reaching the sensitive electrical components
2Reliability
If the protective member covers the electrodes and bonding wire, then corrosion is prevented, but the bonding wire may experience stress concentration at the curvature portion
Solution Approach 1:
The protective member is designed to extend to the maximum curvature portion of the bonding wire, providing beforehand cushioning and stress distribution at the most vulnerable point. This prevents stress concentration that would otherwise occur at the curvature portion, maintaining bonding wire strength while preserving corrosion protection
3Reliability
If the protective member extends to the maximum curvature of the bonding wire, then stress is alleviated and corrosion protection is enhanced, but the device complexity increases
Solution Approach 1:
The protective member is made of silicone resin, a flexible material that can naturally conform to and extend along the curvature of the bonding wire. This flexibility allows the protective member to achieve the required coverage extent without requiring complex rigid structures, thus maintaining simplicity while providing extended protection to the curvature portion
Data Source
AI summary
The present invention provides a sensor module for preventing the corrosion of electrode pads and a method of manufacturing the same. The sensor module A1 includes: an electronic component 2, having a mounting surface 2a and an installation surface 2b facing opposite sides, wherein the mounting surface 2a is disposed with electrode pads 21; an atmospheric pressure sensor 3, having a main surface 3a and an installation surface 3b facing opposite sides, and a side surface 3c connecting the main surface 3a to the installation surface 3b, and mounted on the mounting surface 2a of the electronic component 2 with the installation surface 3b facing the electronic component 2; a bonding wire 4, connected to the electrode pads 21; and a protective member 5, covering the electrode pads 21. The protective member 5 exposes a portion of the bonding wire 4 and is in contact with the side surface 3c of the atmospheric pressure sensor 3.