Dielectric Hair Styling Apparatus with Frequency Control
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Solution Overview
Problem
Conventional electric hair stylers using resistive heating elements pose safety risks due to high temperatures and require costly temperature-resistant materials, while existing dielectric heating methods for hair styling are inefficient due to variable peak absorption frequencies and moisture content changes.
Innovation Solution
A hair styling apparatus utilizing dielectric heating with movable arms and electrodes that sense and adjust the frequency of an alternating electric field to maintain optimal energy coupling, employing control circuitry to vary the electrical energy supplied based on changes in coupling efficiency, and using plastic materials for cost-effectiveness and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If resistive heating elements are used to heat hair, then effective hair styling is achieved, but safety risks increase due to high temperatures and costly temperature-resistant materials are required
Solution Approach 1:
The patent replaces the resistive heating mechanism (Joule heating through heating plates) with dielectric heating using an alternating electric field. This substitution eliminates the need for high-temperature heating plates and temperature-resistant materials, thereby reducing safety risks while maintaining effective hair styling capability
Solution Approach 2:
The patent changes the heating mechanism from thermal conduction through resistive heating to dielectric heating via alternating electric field. This parameter change allows heating at lower temperatures (60-80°C) by manipulating the dielectric properties of hair rather than relying on high thermal energy
2Object-affected harmful factors
If dielectric heating is used to heat hair, then safety is improved by reducing plate temperature, but energy coupling efficiency decreases due to variable peak absorption frequencies
Solution Approach 1:
The patent incorporates feedback control by sensing the coupling of energy from the alternating electric field to the hair and adjusting the frequency accordingly. This feedback mechanism maintains optimal energy coupling efficiency despite changes in hair moisture content and peak absorption frequency during the styling process
Solution Approach 2:
The patent employs dynamic frequency adjustment where the frequency of the alternating electric field is varied in real-time based on the hair's changing dielectric properties. This dynamic adaptation ensures continuous optimal energy transfer from the field to the hair throughout the styling process
3Device complexity
If fixed frequency alternating electric field is applied for dielectric heating, then device complexity is reduced, but heating efficiency decreases due to changing peak absorption frequency during styling
Solution Approach 1:
The patent uses feedback control to sense changes in energy coupling efficiency and automatically adjust the operating frequency. This feedback mechanism enables the system to maintain high heating efficiency without requiring complex manual intervention or pre-programming
Solution Approach 2:
The system performs self-adjustment by automatically detecting changes in hair moisture content and peak absorption frequency, then autonomously modifying the operating frequency to maintain optimal coupling. This self-service capability eliminates the need for external monitoring or manual recalibration
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 solution provides a safer and more efficient hair styling process by maintaining efficient energy coupling to hair throughout styling, reducing operational temperatures, and allowing for cost-effective manufacturing with lower risk of health hazards and electromagnetic compatibility issues.
Implementation Method 1
Dielectric heating is a known technique to heat electrically non-conductive materials, whereby energy from an alternating electric field is coupled to a dielectric medium to heat it. To heat the hair dielectrically, the hair is placed between two electrode plates (in the manner of a capacitor), such that the hair acts as a dielectric medium between the plates. An alternating electric field is applied between the plates, which forces molecular alignment in the hair. The alignment of the molecules causes vibrations or phonons, and hence the temperature of the hair increases: there is heat generation.
Implementation Method 2
However, materials with polar bonds (and water), such as hair, particularly damp or moist hair, interact with the field more strongly, thus increasing the amount of heat dissipated (the so-called 'dissipation factor').
Data Source
AI summary
Apparatus for manipulating the shape of hair using dielectric heating is provided. Typically, the apparatus comprises opposing first and second electrodes respectively provided on first and second arms that are movable towards and away from one another; and drive circuitry for supplying electrical energy to the first and second electrodes, to cause an alternating electric field to be produced in the vicinity of the electrodes in use, and thereby cause dielectric heating of hair placed between the electrodes in use. Sensing circuitry may also be provided for sensing a change in coupling of energy from the alternating electric field to the hair during heating of the hair; and control circuitry for controlling the drive circuitry to vary the electrical energy supplied to the first and second electrodes in dependence upon the sensed change in coupling. A related method of manipulating the shape of hair using dielectric heating is also provided.