Capacitance Module Coil Shield for EMI-Safe Haptic Sensing

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Solution Overview

Problem

Existing touch pad systems face challenges in effectively managing electromagnetic interference (EMI) and providing accurate pressure sensing and haptic feedback due to the integration of inductive components, which can interfere with other electronic components and reduce the effectiveness of haptic responses.

Innovation Solution

The implementation of a capacitance module with a ring-like coil shield structure around the inductance coil to reduce electromagnetic interference, combined with a controller to detect changes in distance and provide haptic effects by interacting with a magnet, enhancing the accuracy of pressure sensing and haptic feedback.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If an inductance coil is integrated into the capacitance module for pressure sensing and haptic feedback, then the functionality of the touch pad is enhanced, but electromagnetic interference with other electronic components increases

Engineering Contradiction:

ImprovefunctionalityVSAvoidelectromagnetic interference

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

A coil shield is introduced as an intermediary component between the inductance coil and other electronic components. The coil shield, made of conductive material, acts as a barrier that blocks electromagnetic fields from the inductance coil from interfering with adjacent electronic components, while allowing the inductance coil to maintain its pressure sensing and haptic feedback functions.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The harmful electromagnetic interference is extracted and isolated from the main system by using the coil shield to contain and redirect the electromagnetic fields generated by the inductance coil. This separates the useful electromagnetic functions (pressure sensing and haptic feedback) from the harmful interference effects.

Inventive Principle:

Principle #2Taking out (Extraction)

2Measurement precision

If a coil shield is added to reduce electromagnetic interference, then the accuracy of pressure sensing and haptic feedback is improved, but the device complexity increases

Engineering Contradiction:

ImproveaccuracyVSAvoidstructure

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The coil shield serves multiple functions simultaneously: it reduces electromagnetic interference with other electronic components, enhances the accuracy of pressure sensing by stabilizing the electromagnetic field, and improves haptic feedback performance. This multi-functionality justifies the additional structural element.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The coil shield is implemented as a thin, flexible conductive layer that can be deposited on the substrate using standard manufacturing techniques. This thin-film approach minimizes the increase in device complexity and thickness while still providing effective electromagnetic shielding.

Inventive Principle:

Principle #30Flexible shells and thin films

3Power

If the inductance coil is positioned close to the magnet for effective interaction, then the haptic feedback performance is improved, but electromagnetic interference with surrounding components increases

Engineering Contradiction:

Improvehaptic feedback performanceVSAvoidelectromagnetic interference

Core Design Contradiction:

PowerVSObject-affected harmful factors

Solution Approach 1:

The coil shield is positioned locally around the inductance coil, creating a localized electromagnetic containment zone. This allows the inductance coil to operate at high power levels close to the magnet for effective haptic feedback, while the shield locally contains the electromagnetic interference in a specific region rather than allowing it to propagate throughout the entire device.

Inventive Principle:

Principle #3Local quality

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 coil shield structure effectively suppresses electromagnetic interference, improving the accuracy of pressure sensing and haptic feedback, ensuring reliable operation of touch pad systems.

Implementation Method 1

the first coil shield and the second coil shield are positioned to reduce electromagnetic interference between the inductance coil and other electronic components of the capacitance module

Methodology Applied

Scientific EffectElectromagnetic shielding: Faraday Cage

Implementation Method 2

the inductance coil is positioned to interact with a magnet adjacent to the inductance coil

Methodology Applied

Scientific EffectMagnetic coupling: Magnetic Field

Data Source

PatentUS20250355530A1Coil shield of a capacitance module

Publication Date: 2025.11.20 CIRQUE CORP

AI summary

A capacitance module may include at least one touch electrode on a first surface of the capacitance module; a first portion of an inductance coil deposited on a second surface of the capacitance module; a second portion of the inductance coil deposited on a third surface of the capacitance module; a first coil shield deposited on the second surface of the capacitance module; and a second coil shield deposited on the third surface of the capacitance module; where the first portion of the inductance coil and the second portion of the inductance coil are electrically connected; where the inductance coil is positioned to interact with a magnet adjacent to the inductance coil; and where the first coil shield and the second coil shield are positioned to reduce electromagnetic interference between the inductance coil and other electronic components of the capacitance module.