Flow Rate Sensor Wettability Gradient for Resin Control
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Solution Overview
Problem
Conventional flow rate detection devices face quality deterioration due to unstable application of sealing resin, leading to inconsistent coverage of electrode parts in physical quantity sensors, which affects the accuracy of fluid flow rate measurement.
Innovation Solution
The flow rate detection device incorporates a circuit board with a physical quantity sensor mounting surface that has a higher wettability for the sealing resin in the mounting region compared to the peripheral region, limiting the wet spread of the sealing resin and ensuring consistent coverage of the electrode parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the sealing resin is applied to the physical quantity sensor mounting surface without differential wettability treatment, then the application process is simple, but the sealing resin spreads unstably and fails to cover electrode parts consistently
Solution Approach 1:
The physical quantity sensor mounting surface is divided into a mounting region and a peripheral region with different wettability characteristics. The mounting region has higher wettability to promote sealing resin spread and coverage of electrode parts, while the peripheral region has lower wettability to limit resin spread. This local differentiation resolves the contradiction by achieving precise control over sealing resin distribution without requiring complex multi-component structures.
2Reliability
If the sealing resin application range is not limited, then the application process is simple, but the sealing resin covers areas beyond the electrode parts causing inadequate coverage in critical areas
Solution Approach 1:
The wettability parameter of the mounting surface is changed between different regions. By making the mounting region have higher wettability than the peripheral region, the sealing resin naturally spreads to cover electrode parts reliably while being limited from spreading too far. This parameter-based control achieves reliable electrode coverage without requiring complex application processes or additional limiting structures.
3Stability of the object's composition
If uniform wettability is used across the mounting surface, then the surface treatment is simple, but the sealing resin application becomes unstable and varies between applications
Solution Approach 1:
Instead of using uniform wettability across the entire mounting surface, the invention implements local quality differentiation where the mounting region has higher wettability than the peripheral region. This creates stable and consistent sealing resin application by ensuring the resin naturally spreads to cover electrode parts while being constrained from excessive spread, thereby achieving both application stability and manufacturing 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
This approach reduces variation in the sealing resin application, enhancing the reliability and accuracy of the flow rate detection device by stabilizing the application range and preventing inadequate coverage of the electrode parts.
Implementation Method 1
a wettability of the mounting region surface for the sealing resin in the liquid form is higher than a wettability of the peripheral region surface for the sealing resin in the liquid form
Data Source
AI summary
A physical quantity sensor detects a physical quantity of a fluid and a sealing resin. The physical quantity sensor is mounted on a circuit board and includes an electrode part electrically connected to the circuit board. The sealing resin is provided on a physical quantity sensor mounting surface, which is formed on the circuit board and equipped with the physical quantity sensor, and covers the electrode part. The physical quantity sensor mounting surface includes a mounting region surface including a place where the physical quantity sensor is provided and a place where the sealing resin is provided and a peripheral region surface extending around the mounting region surface. A wettability of the mounting region surface for the sealing resin in a liquid form is higher than a wettability of the peripheral region surface for the sealing resin in the liquid form.