Strain Sensor Magnetic Shielding with Resin Frame
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Solution Overview
Problem
The increasing component packaging density in electronic devices leads to challenges in preventing electromagnetic interference (EMI), particularly for strain sensors using magnetoresistance effect elements, which are sensitive to external magnetic fields, necessitating effective magnetic shielding without increasing device weight or size.
Innovation Solution
A strain sensor design incorporating a nonconductive frame with a magnetic body, made from a resin-based magnetic paste, is used to shield external magnetic fields, allowing the magnetoresistance effect element to be housed within, thereby blocking external magnetic interference without the need for a metal case, while maintaining a compact and lightweight structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal case or conductive plating is used to shield external magnetic fields, then magnetic shield characteristics are improved, but device weight and size increase
Solution Approach 1:
The patent changes the material parameter from conductive metal to nonconductive magnetic resin, fundamentally altering the shielding mechanism from electromagnetic induction to magnetic field absorption and redirection, thereby reducing weight while maintaining shielding effectiveness
Solution Approach 2:
The patent uses a composite material consisting of magnetic particles dispersed in a nonconductive resin matrix, combining the magnetic shielding properties of magnetic materials with the lightweight and nonconductive characteristics of resin, achieving both magnetic shield characteristics and weight reduction
2Reliability
If a metal case or conductive plating is used to shield external magnetic fields, then magnetic shield characteristics are improved, but device complexity increases
Solution Approach 1:
The patent merges the magnetic shielding function with the existing sensor housing or packaging structure by using magnetic resin, eliminating the need for separate metal shielding components and simplifying the overall device structure
Solution Approach 2:
The magnetic resin serves multiple functions simultaneously: it provides magnetic field shielding, acts as a structural housing material, and maintains electrical insulation, thereby reducing the number of separate components needed in the device
3Measurement precision
If magnetoresistance effect element is used in strain sensor, then sensing capability is improved, but sensitivity to external magnetic fields increases
Solution Approach 1:
The magnetic resin acts as an intermediary between the magnetoresistance effect element and external magnetic fields, selectively allowing strain-induced magnetic field changes to reach the sensor while blocking or redirecting external magnetic interference, thus protecting the sensitive element
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 effectively shields external magnetic fields, reduces the strain sensor's size and weight, and enhances its magnetic shield characteristics, ensuring reliable operation while maintaining high productivity in manufacturing.
Implementation Method 1
a strain sensor using a magnetoresistance effect element is mounted in the electronic device
Implementation Method 2
A strain sensor design incorporating a nonconductive frame with a magnetic body, made from a resin-based magnetic paste, is used to shield external magnetic fields
Data Source
AI summary
According to one embodiment, a strain sensor includes a substrate, a lid, a frame, and a sensing unit. The substrate has a first surface. The lid is provided on the first surface. The frame is provided between the substrate and the lid. The frame is nonconductive and includes a magnetic body. The sensing unit is provided inside the frame between the substrate and the lid, and includes a magnetoresistance effect element.