Magnetic Powder Shielding Layer for Geo-Magnetic Sensor
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Solution Overview
Problem
Magnetic field shielding layers in pointing input devices often interfere with geo-magnetic sensors, blocking Earth's magnetic field and affecting their operation, while also failing to effectively block strong low-frequency magnetic fields generated by device components.
Innovation Solution
A magnetic field shielding layer composed of magnetic powder is used, which is scattered and mixed with an adhesive to form a partial shielding layer that transmits Earth's magnetic field to the geo-magnetic sensor while blocking magnetic fields from device components, maintaining the sensor's operation and reducing eddy current-induced attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic field shielding layer is used to block magnetic fields from device components, then magnetic field attenuation is prevented and pointing input device performance is improved, but Earth's magnetic field is blocked and geo-magnetic sensor operation is affected
Solution Approach 1:
The magnetic powder is scattered and distributed non-uniformly within the adhesive layer, creating local variations in magnetic shielding properties. This allows the shielding layer to block magnetic fields from device components in certain regions while permitting Earth's magnetic field to pass through to the geo-magnetic sensor in other regions, thus resolving the contradiction between shielding effectiveness and sensor operation.
Solution Approach 2:
The magnetic field shielding layer is constructed as a composite material consisting of magnetic powder particles dispersed in an adhesive matrix. This composite structure provides magnetic shielding properties to block harmful magnetic fields from device components while the adhesive matrix and scattered distribution allow partial transmission of Earth's magnetic field to the geo-magnetic sensor, simultaneously achieving both shielding and sensor functionality.
2Object-affected harmful factors
If a magnetic field shielding layer is used to block strong low-frequency magnetic fields from magnetic parts, then magnetic field interference is reduced, but the shielding layer also blocks Earth's magnetic field needed by the geo-magnetic sensor
Solution Approach 1:
The magnetic powder concentration, particle size, and distribution density are optimized to achieve frequency-selective magnetic field shielding. The shielding layer parameters are tuned to block strong low-frequency magnetic fields from magnetic parts while maintaining sufficient transmission of Earth's magnetic field for accurate geo-magnetic sensing, thus resolving the contradiction between interference reduction and sensing 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
The magnetic powder shielding layer allows accurate geo-magnetic sensing and prevents magnetic field attenuation, ensuring the geo-magnetic sensor can operate effectively while blocking strong low-frequency magnetic fields, thus enhancing the overall performance of the pointing input device.
Implementation Method 1
a magnetic field shielding layer which transmits Earth's magnetic field sensed by a geo-magnetic sensor
Implementation Method 2
a geo-magnetic sensor for sensing Earth's magnetic field passing through the magnetic field partial shielding layer
Data Source
AI summary
A magnetic field shielding layer that does not affect an operation of a geo-magnetic sensor in a pointing input device of a touch screen type using an electromagnetic pen is provided. A magnetic field shielding layer is composed of magnetic metal powder. The magnetic field shielding layer is formed directly on the pointing input device without a need for a separate adhesive layer.