Device for treating the hair

Abstract

A device for treating, notably for shaping, in particular straightening, the hair, having at least one active portion comprising at least one light emission source that is able to emit, towards the hair, light radiation having a dominant wavelength peak of between 0.8 μm and 5 μm. The invention also relates to a method for treating the hair, notably for straightening it, using such a device.

1 . A device for treating, notably for shaping, in particular straightening, the hair, having at least one active portion comprising at least one light emission source that is able to emit, towards the hair, light radiation having a dominant wavelength peak of between 0.8 μm and 5 μm. 
     
     
         2 . The device according to  claim 1 , which is a straightening, curling or crimping device, having two arms that are able to move relative to one another between a moved-together configuration for treating the hair and a spaced-apart configuration for inserting hair to be treated between said arms, the arms defining half-handles that are continued towards their distal ends by jaws, said at least one active portion being carried by one of the two jaws. 
     
     
         3 . The device according to  claim 2 , wherein at least one of the two jaws is flat, and better still both of the jaws are flat. 
     
     
         4 . The device according to  claim 2 , wherein each of the two jaws carries at least one active portion comprising at least one light emission source that is able to emit, towards the hair, radiation having a dominant wavelength peak of between 0.8 μm and 5 μm. 
     
     
         5 . The device according to  claim 1 , wherein the light source or sources has or have at least one light-emitting diode emitting in the infrared. 
     
     
         6 . The device according to  claim 1 , wherein the light source or sources has or have at least one carbon infrared emitter, notably a halogen lamp with a carbon filament. 
     
     
         7 . The device according to  claim 6 , wherein the light source or sources has or have at least one infrared emitter comprising a carbon filament with a diameter ranging from 8 mm to 25 mm. 
     
     
         8 . The device according to  claim 6 , wherein the light source or sources has or have at least one infrared emitter comprising a carbon filament with a length ranging from 200 mm to 400 mm. 
     
     
         9 . The device according to  claim 2 , wherein the jaws of the arms do not have heating elements other than the active portion or portions comprising the light source or sources. 
     
     
         10 . The device according to  claim 9 , wherein said at least one light source is disposed at the centre or at the ends of the jaws of the arms, the device having notably a plurality of light sources disposed in one or more rows, or in an array of light sources. 
     
     
         11 . The device according to  claim 2 , wherein at least one of the two jaws has at least one additional heating element intended to come into contact with the hair, and better still each of the two jaws has at least one additional heating element, the additional heating element or elements preferably having a plate defining a hot surface for contact with the hair, notably made of metal, glass or ceramic. 
     
     
         12 . The device according to  claim 1 , wherein said at least one light source is a pulsed-light source. 
     
     
         13 . A method for treating, notably shaping, in particular straightening, the hair, using a device for treating the hair, notably according to  claim 1 , wherein, in said method, in order to treat the hair, at least one lock of hair is exposed to light radiation having a dominant wavelength peak of between 0.8 μm and 5 μm. 
     
     
         14 . The method according to  claim 13 , having an additional step of applying one or more hair compositions to all or part of the head of hair to be treated, before, during or after the use of the treatment device. 
     
     
         15 . The method according to  claim 14 , wherein the hair composition used comprises at least one agent for breaking the disulfide bridges present in the hair, preferably at least one thiol. 
     
     
         16 . The method according to  claim 13 , also comprising a step of treatment using steam, notably during the exposure to light, the steam flow rate being notably less than 1 g/min.