An apparatus manipulates the shape of hair using dielectric heating. Typically,the apparatus includes opposing first and second electrodes respectively provided on first and second arms that are movable towards and away from one another. Drive circuitry supplies 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 senses a change in coupling of energy from the alternating electric field to the hair during heating of the hair. Control circuitry controls 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 manipulates the shape of hair using dielectric heating.

A hair styling device includes an upper gripping portion, a lower gripping portion, a hinge structure connecting the upper gripping portion and the lower gripping portion, an upper clamping head connected to the upper gripping portion and a lower clamping head connected to the lower gripping portion. The upper clamping head includes an upper clamping surface and a top, The lower clamping head includes a lower clamping surface and a bottom. The lower clamping surface and the upper clamping surface are arranged to be paired together when the hair styling device is in a closed position. The upper clamping surface has an upper twisted deflection angle with respect to the upper gripping portion. The lower clamping surface has a lower twisted deflection angle with respect to the lower gripping portion. The upper twisted deflection angle is equal to the lower twisted deflection angle.

A hair styling device includes an upper gripping portion, a lower gripping portion, a hinge structure connecting the upper gripping portion and the lower gripping portion, an upper clamping head connected to the upper gripping portion and a lower clamping head connected to the lower gripping portion. The upper clamping head includes an upper clamping surface and a top, The lower clamping head includes a lower clamping surface and a bottom. The lower clamping surface and the upper clamping surface are arranged to be paired together when the hair styling device is in a closed position. The upper clamping surface has an upper twisted deflection angle with respect to the upper gripping portion. The lower clamping surface has a lower twisted deflection angle with respect to the lower gripping portion. The upper twisted deflection angle is equal to the lower twisted deflection angle.

The invention relates to a cosmetic refill (20) intended to be inserted in a removable manner into a housing (22) in a device (2) for treating the hair and to the associated treatment device (2). The cosmetic refill (20) comprises a body (23) that has a first wall (40) and a second wall (38) opposite the first wall (40), and at least one coupling relief (50, 52) that extends from each of the first wall (40) and the second wall (38). The coupling relief (50) on the first wall (40) is intended to cooperate with a first surface (46) of the housing (22) when the first wall (40) is introduced into the housing (22). The coupling relief (52) on the second wall (38) is intended to cooperate with a second surface (44) of the housing (22) when the refill (20) is brought into a use position by pivoting in the housing (22) about a pivot axis (B).

The invention relates to a cosmetic refill (20) intended to be inserted in a removable manner into a housing (22) in a device (2) for treating the hair and to the associated treatment device (2). The cosmetic refill (20) comprises a body (23) that has a first wall (40) and a second wall (38) opposite the first wall (40), and at least one coupling relief (50, 52) that extends from each of the first wall (40) and the second wall (38). The coupling relief (50) on the first wall (40) is intended to cooperate with a first surface (46) of the housing (22) when the first wall (40) is introduced into the housing (22). The coupling relief (52) on the second wall (38) is intended to cooperate with a second surface (44) of the housing (22) when the refill (20) is brought into a use position by pivoting in the housing (22) about a pivot axis (B).

Methods and apparatus include a hair iron having a controller and a heater between first and second arms movable relative to each other between open and closed positions. The controller connects or not the heater to a line voltage to heat hair when placed between the arms during use. A proportional-integral-derivative (PID) controller communicates with a thermistor measuring a current temperature of the heater and makes requests of the controller to operate the heater at a setpoint temperature. In various embodiments, the heater heats to full power during warm-up and operates thereafter at lower temperatures based on a reading of the line voltage and a time to adjust the current temperature to the desired setpoint temperature.

A hair care device (100) comprises a heat source (103) for heating hair up till a first temperature that is no more than 150° C. (and thus lower than a critical temperature at which hair cuticle damage will occur), and a radiation source (102) for—in combination with heat from the heat source (103)—selectively heating a hair cortex to a second temperature exceeding the first temperature and sufficiently high for hair styling.

A hair care device (100) comprises a heat source (103) for heating hair up till a first temperature that is no more than 150° C. (and thus lower than a critical temperature at which hair cuticle damage will occur), and a radiation source (102) for—in combination with heat from the heat source (103)—selectively heating a hair cortex to a second temperature exceeding the first temperature and sufficiently high for hair styling.

The present invention provides a heating apparatus for heating a load. The heating apparatus comprises a heater having a heating element for receiving electrical power and for converting the electrical power into heat to heat a heating surface of the heater. The heating apparatus also comprises a temperature sensor for sensing and outputting a measurement of the temperature of the heating element, a power actuator for providing the electrical power to the heating element of the heater, a power sensor for sensing and outputting a measurement of the power provided to the heating element by the power actuator, and control circuitry for controlling the power actuator to control the power delivered by the power actuator to the heating element. The control circuitry is configured to receive the temperature measurement from the temperature sensor, receive the power measurement from the power sensor, combine the temperature measurement and the power measurement, and control the power actuator in dependence upon the combined temperature measurement and power measurement. This ensures that the temperature of the heating surface is constant throughout a period when the load is applied.

The invention discloses a hair straightener capable of automatically distinguishing dry and wet hair. The hair straightener comprises two heating panels, each of the two heating panels having a heating surface, the two heating surfaces cooperating with each other for clasping hair and for hair styling; a conduction assembly, provided in one of the two heating panels, and configured to detect the humidity of hair; and a circuit control system for controlling temperatures of the two heating panels upon receipt of the humidity of the hair detected by the conduction assembly. According to the invention, the temperature of the heating panels can be adjusted to an appropriate temperature after the humidity of the hair is detected, so that the hair conditions are in the best state.