Dielectric Hair Styler Shielding for Accurate Hair Sensing

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Solution Overview

Problem

Conventional hair styling appliances that use heating plates to reshape hair can cause damage due to excessive heating and drying, and they are inefficient in power usage when no hair is present between the plates, with electromagnetic interference affecting sensor accuracy.

Innovation Solution

A hair styling appliance that heats hair dielectrically using electrodes, shielded to block electromagnetic fields, and includes a sensor assembly outside the shielding to sense hair properties like temperature, humidity, and movement, controlling electrode energization based on these properties to prevent damage and improve efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If conventional heating plates are used to heat hair, then hair can be heated to reshape it, but the appliance draws significant power even when no hair is present and excessive heating can damage hair

Engineering Contradiction:

Improvepower consumptionVSAvoidhair damage risk

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent replaces the conventional thermal heating system with a dielectric heating system using electrodes. The electrodes generate an electromagnetic field that directly heats hair through dielectric heating, eliminating the need for high-temperature heating plates. This substitution reduces power consumption when no hair is present while maintaining controlled heating capability to prevent damage.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent incorporates a sensor assembly that detects hair properties (temperature, humidity, movement) and provides feedback to the control system. The control system adjusts electrode energization based on this feedback, preventing excessive heating and optimizing power usage. This closed-loop control ensures hair safety while improving energy efficiency.

Inventive Principle:

Principle #23Feedback

2Use of energy by moving object

If electrodes are used to heat hair dielectrically, then power consumption is reduced and heating is more efficient, but electromagnetic fields generated by the electrodes interfere with sensor accuracy

Engineering Contradiction:

Improvepower consumptionVSAvoidsensor accuracy

Core Design Contradiction:

Use of energy by moving objectVSMeasurement precision

Solution Approach 1:

The patent introduces shielding as an intermediary element between the electrodes and the sensor assembly. The shielding blocks electromagnetic fields from the electrodes, preventing interference with the sensor measurements. This allows the sensor to accurately detect hair properties while the electrodes continue to generate electromagnetic fields for dielectric heating.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Measurement precision

If shielding is added to block electromagnetic fields, then sensor accuracy is improved, but device complexity increases

Engineering Contradiction:

Improvesensor accuracyVSAvoidappliance structure

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent employs shielding that can be implemented as thin film or shell structures. This provides effective electromagnetic field blocking while minimizing the added complexity and bulk to the appliance design. The shielding integrates smoothly into the existing appliance structure without requiring major redesign.

Inventive Principle:

Principle #30Flexible shells and thin films

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 appliance reduces the risk of hair damage by accurately regulating heat and power usage, improving safety and efficiency by sensing hair properties without interference from electromagnetic fields.

Implementation Method 1

electrodes (40) ... to heat hair dielectrically

Methodology Applied

Scientific EffectDielectric heating: Dielectric Heating

Data Source

PatentUS20250380781A1Hair styling appliance

Publication Date: 2025.12.18 DYSON TECH LTD

AI summary

Disclosed herein is a hair styling appliance that includes electrodes and a control system that, during operation, energises the electrodes to heat hair dielectrically. A shielding bounds the electrodes to block an electromagnetic field that is generated by the electrodes when energised. Further, a sensor assembly is located outside of the shielding, and the sensor assembly is used to sense a property of hair for the hair styling appliance.