Digitizer With Oriented Magnetic Powder Shielding Layer
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Solution Overview
Problem
Capacitive touch screens and EM pointing input units in electronic devices face interference from stray electromagnetic fields generated by circuit components and batteries, limiting their functionality and requiring complex mounting mechanisms.
Innovation Solution
A digitizer with a magnetic field shielding layer containing oriented magnetic powder, integrated with a circuit layer and a conductive layer, is designed to reduce electromagnetic interference, featuring a thin mechanical structure and simplified manufacturing process through hot pressing of the layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a magnetic field shielding layer with disoriented magnetic powder is used, then the manufacturing process is simple, but the electromagnetic interference reduction effectiveness is insufficient
Solution Approach 1:
The patent changes the orientation parameter of magnetic powder from disoriented to vertically oriented through the hot pressing process. This parameter change transforms the magnetic shielding layer from having insufficient shielding effectiveness to providing effective electromagnetic interference reduction, while the orientation is achieved automatically during manufacturing rather than through complex post-processing
Solution Approach 2:
The patent replaces complex mechanical mounting mechanisms with a simplified layered structure where the magnetic field shielding layer is integrated directly into the digitizer assembly through hot pressing. This eliminates the need for separate mounting mechanisms while maintaining electromagnetic interference protection
2Object-affected harmful factors
If a complex mounting mechanism is used to protect against electromagnetic interference, then the shielding effectiveness is improved, but the device structure becomes more complex
Solution Approach 1:
The patent merges the magnetic field shielding layer with the circuit layer and conductive layer into a single integrated digitizer structure. The shielding function is combined with the existing structural layers through hot pressing, eliminating the need for separate mounting mechanisms and reducing overall device complexity while maintaining effective electromagnetic interference protection
Solution Approach 2:
The magnetic field shielding layer serves multiple functions: it provides electromagnetic interference protection, maintains the structural integrity of the digitizer, and enables both capacitive and EM pointing input functionality. This multi-functionality reduces the need for additional specialized components and mounting mechanisms
3Object-affected harmful factors
If the magnetic powder is oriented manually after manufacturing, then the electromagnetic interference reduction is improved, but the manufacturing process becomes more complex and time-consuming
Solution Approach 1:
The patent performs the magnetic powder orientation action during the hot pressing stage, which is already part of the standard manufacturing process. The orientation is achieved preliminarily before final assembly, eliminating the need for separate post-manufacturing orientation steps and maintaining high manufacturing efficiency while ensuring effective electromagnetic interference reduction
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 digitizer effectively minimizes electromagnetic interference, allowing for reliable operation with both finger and stylus inputs, and simplifies the manufacturing process by automating the orientation of magnetic powder during the hot pressing stage.
Implementation Method 1
a magnetic field shielding layer that contains disoriented magnetic powder
Implementation Method 2
hot pressing the circuit layer and the magnetic field shielding layer so as to orient the magnetic powder
Data Source
AI summary
A method of manufacturing a digitizer includes forming a circuit layer that detects an input, forming a magnetic field shielding layer that contains disoriented magnetic powder, disposing an adhesive between the circuit layer and the magnetic field shielding layer, and hot pressing the circuit layer and the magnetic field shielding layer so as to orient the magnetic powder.