Touchless Passenger Reading Light Control Using Capacitive Sensing

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Solution Overview

Problem

Modern aircraft passenger reading lights require manual operation, which can spread pathogens through contact surfaces, compromising passenger and crew safety.

Innovation Solution

A touchless light system with a touchless control panel and sensor that detects user input without contact, allowing control of light activation, intensity, direction, and shape through electromagnetic fields, using projected capacitive sensors and a light controller to operate light assemblies.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If manual control surfaces are used, then ease of operation is improved, but pathogen transmission risk increases

Engineering Contradiction:

Improvemanual controlVSAvoidpathogen transmission

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent replaces mechanical contact-based control with electromagnetic field-based detection. Projected capacitive sensors detect changes in the electromagnetic field caused by proximity of conductive objects (fingers), enabling touchless operation while maintaining ease of use through intuitive gesture-based control.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces an electromagnetic field as an intermediary between the user and the control system. The projected capacitive sensor detects disturbances in this field caused by nearby objects, allowing control without direct contact with the control panel surface.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If touchless control is implemented, then pathogen transmission is reduced, but device complexity increases

Engineering Contradiction:

Improvepathogen transmissionVSAvoidcontrol system

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent makes the control panel surface serve multiple functions: it acts as both the display interface and the sensor array. The projected capacitive technology integrates sensing capabilities directly into the control panel surface, eliminating the need for separate physical buttons or switches.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent changes the operational parameter from contact-based mechanical input to proximity-based electromagnetic field detection. This allows the system to detect user intent through changes in electrical capacitance caused by nearby conductive objects, enabling touchless control.

Inventive Principle:

Principle #35Parameter changes

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

Reduces the risk of pathogen transmission by eliminating direct contact with surfaces, providing safe and intuitive control of cabin lights.

Implementation Method 1

the touchless sensor is configured to project an electromagnetic field over the surface of the touchless control panel

Methodology Applied

Scientific EffectElectromagnetic field projection: Electromagnetic Induction

Implementation Method 2

the touchless sensor is configured to detect an object within a detection region a surface of the touchless control panel

Methodology Applied

Scientific EffectCapacitive sensing: Capacitance

Data Source

PatentUS12376213B2Systems and methods for touchless passenger light control

Publication Date: 2025.07.29 GOODRICH CORP

AI summary

A touchless light system may comprise a light assembly, a light controller operably coupled to the light, and a touchless control panel configured to detect and interpret a user input and send an object detection signals to the light controller based on the user input. The light controller may be configured to send to a light command to the light assembly based on the object detection signal.