Flow Meter Resin Package Exposure Portion for Electrical Connection
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Solution Overview
Problem
In thermal type flowmeters, it is challenging to establish electrical connections with conductors exposed to the measurement target gas due to the embedding of lead frames and circuit components in resin materials, making it difficult to connect them effectively.
Innovation Solution
A flowmeter design that includes a package with a lead and circuit component, where a portion of the lead is molded with resin and features an exposure portion to facilitate electrical connection with a conductor, allowing for easy connection and preventing foreign substances from adhering to the flow rate measurement unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lead frame and circuit component are embedded in resin material to form a circuit package, then the protection and integration of components is improved, but the ease of establishing electrical connection with conductors is worsened
Solution Approach 1:
The patent extracts the electrical connection function from the enclosed resin package by providing an exposure portion that extends outward from the resin material. This allows the lead to be accessible for electrical connection while the rest of the circuit components remain protected within the resin encapsulation, thus resolving the contradiction between component protection and connection ease.
2Reliability
If the lead is fully enclosed in resin material, then the protection of circuit components is improved, but the ease of manufacture for electrical connection is worsened
Solution Approach 1:
The patent applies local quality by differentiating the encapsulation degree of different parts of the lead. The connection portion is left exposed while other portions are enclosed in resin, allowing easier manufacturing of electrical connections at the exposed area while maintaining overall component protection. This localized approach resolves the contradiction between full encapsulation benefits and manufacturing ease.
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 design enables easy connection of the conductor to the package, preventing foreign substances from adhering and ensuring accurate measurement performance by removing static electricity, thus enhancing the reliability and efficiency of the flowmeter.
Implementation Method 1
a hot wire, a silicon element, or the like is disposed and the mass flow rate in the pipe is measured by using a fact that the hot wire, the silicon element, or the like is cooled by an air stream and the electrical resistivity changes
Implementation Method 2
a static electricity dissipation region is provided in a bypass path and electric charge of the corrupting substance is eliminated
Data Source
AI summary
To obtain a flow meter with which it is possible to facilitate establishing an electrical connection with a conductor exposed in a location through which a gas to be measured passes. A flow meter that is provided with a lead and a circuit component placed on the lead, and that has a package in which part of the lead is molded from a resin, wherein the package is provided with an exposure portion for exposing part of the lead from the resin member, the exposure portion being electrically connected to a conductor that constitutes part of an auxiliary passage.