Back to results
US 2025/0134227 A1Published application
Hair styling device
AssigneeDyson Technology Limited
InventorsDaniel James Bernard SMITH, Barrie Charles MECROW, Mark TURNER
Life of this patent
Estimating the term…
Abstract
A hair styling device for heating hair is provided. The device comprises an induction heating plate arranged to be heated by penetration with a varying magnetic field and an induction heating assembly configured to generate the varying magnetic field.
Claims27
A hair styling device for heating hair, comprising:
- an induction heating plate arranged to be heated by penetration with a varying magnetic field;
- and
- an induction heating assembly having a top side facing towards the heating plate, and a bottom side facing away from the heating plate, wherein the induction heating assembly is configured to generate a varying magnetic field, the varying magnetic field being asymmetric such that the magnetic field strength at the top side is substantially greater than the magnetic field strength at the bottom side.
A hair styling device for heating hair, comprising:
- a flexible induction heating plate configured to be heated by penetration with a varying magnetic field;
- and
- an induction heating assembly configured to generate a varying magnetic field, the induction heating assembly comprising a first heating zone to heat a first region of the heating plate, and a second heating zone to heat a second region of the heating plate;
- wherein:
- the first and second regions of the heating plate are independently moveable between a first position and a second position, the second position being closer to the heating assembly than the first position, wherein the first and second regions are biased towards the first position in the absence of a force applied by hair and are deflected towards the second position in the presence of a force applied by hair;
- when the first and second regions of the heating plate are arranged in the first position:
- the first and second heating zones have a resonant frequency substantially different to a drive frequency driving the first and second heating zones so as not to cause resonant heating of the first and second regions;
- and
- when the first region is arranged in the second position and the second region remains substantially in the first position:
- the difference between a resonant frequency of the first heating zone in the second position and the drive frequency is smaller than the difference between the resonant frequency of the first heating zone in the first position and the drive frequency, so as to cause resonant heating of the first region;
- and
- the second heating zone maintains a resonant frequency substantially different to the drive frequency so as not to cause resonant heating of the second region.
9 more elements
A hair styling device for heating hair, comprising:
- an induction heating plate configured to be heated by penetration with a varying magnetic field;
- and
- an induction heating assembly configured to generate a varying magnetic field, the induction heating assembly comprising a first heating zone to heat a first region of the heating plate, and a second heating zone to heat a second region of the heating plate;
- wherein:
- the first and second regions are adjacent;
- and
- the first and second regions are separated by an insulating boundary to reduce heat flow between the first and second regions.
4 more elements
A hair styling device for heating hair, comprising:
- a flexible induction heating plate configured to be heated by penetration with a varying magnetic field;
- an induction heating assembly comprising:
- a drive circuit configured to supply alternating current at a drive frequency according to a drive signal;
- and
- a resonant circuit driven by the drive circuit, the resonant circuit being arranged to generate a varying magnetic field for heating the heating plate;
- and
- a controller;
- wherein:
- the heating plate is moveable between a first position and a second position, the second position being closer to the induction heating assembly than the first position, wherein the heating plate is biased towards the first position in the absence of a force applied by hair and is deflected towards the second position in the presence of a force applied by hair;
- and
- the controller is configured to, when the heating plate is arranged in the second position:
- supply the drive circuit with a particular drive signal, thereby causing the drive circuit to supply alternating current at a particular drive frequency;
- determine a phase difference between a current or voltage of the resonant circuit and the particular drive signal;
- determine whether the phase difference corresponds to a predetermined phase difference;
- and
- if the phase difference corresponds to the predetermined phase difference:
- determine that the particular drive frequency corresponds to a resonant frequency of the resonant circuit;
- and
- if the phase difference does not correspond to the predetermined phase difference:
- supply the drive circuit with a different drive signal, thereby causing the drive circuit to supply alternating current at a different drive frequency.
17 more elements
A hair styling device for heating hair, comprising:
- a flexible induction heating plate configured to be heated by penetration with a varying magnetic field;
- an induction heating assembly comprising:
- a drive circuit configured to supply alternating current at a drive frequency according to a drive signal;
- and
- a resonant circuit driven by the drive circuit, the resonant circuit being arranged to generate a varying magnetic field for heating the heating plate;
- and
- a controller;
- wherein:
- the heating plate is moveable between a first position and a second position, the second position being closer to the induction heating assembly than the first position, wherein the heating plate is biased towards the first position in the absence of a force applied by hair and is deflected towards the second position in the presence of a force applied by hair;
- and
- the controller is configured to determine whether the heating plate is arranged in the first position or the second position.
8 more elements
Dependencies are inferred from the claim text.