Hairstyling device

1 . A hairstyling device comprising:

a heatable hair contact member having a hair-contactable surface, the hair contact member being operable to apply heat to hair via the hair-contactable surface;

an inertial measurement unit, IMU, configured to output signals dependent on movement of the hair contact member; and

a controller configured to:

receive a signal from the IMU indicating movement of the hair contact member along a tress of hair between a first end of the tress and a second end of the tress;

process the received signal to determine a speed of the hair contact member;

determine a target heat delivery profile along the tress using the determined speed, wherein the target heat delivery profile comprises a heat delivery profile which varies along the tress; and

control heating of the hair contact member based on the target heat delivery profile.

2 . The hairstyling device according to claim 1 , wherein the controller is configured to adjust an amount of energy used to heat the hair contact member based on the determined speed.

3 . The hairstyling device according to claim 1 ,

wherein the controller is configured to control heating of the hair contact member based on a target operating temperature of the hair contact member, and

wherein the target operating temperature is dependent on the determined speed.

4 . The hairstyling device according to claim 1 , wherein the controller is configured to cause a user interface to provide an output based on the determined speed.

5 . The hairstyling device according to claim 1 , wherein the controller is configured to process received signals from the IMU using a velocity and/or position estimation algorithm.

6 . The hairstyling device according to claim 5 , wherein the velocity and/or position estimation algorithm comprises a Madgwick filter.

7 . The hairstyling device according to claim 1 ,

wherein the first end comprises a hair-root end of the tress, and

wherein the second end comprises a hair-tip end of the tress.

8 . The hairstyling device according to claim 1 ,

wherein the hairstyling device comprises a heating element operable to heat the hair contact member, and

wherein the controller is configured to control the heating element based on the determined speed.

9 . The hairstyling device according to claim 1 , wherein the hairstyling device comprises a hair straightening device and/or a hair curling device.

10 . A hairstyling device comprising:

a heatable hair contact member having a hair-contactable surface, the hair contact member being operable to apply heat to hair via the hair-contactable surface;

an inertial measurement unit, IMU, configured to output signals dependent on movement of the hair contact member; and

a controller configured to:

receive a signal from the IMU indicating movement of the hair contact member along a tress of hair between a first end of the tress and a second end of the tress;

process the received signal to determine a speed of the hair contact member;

on the basis of the determined speed, determine a displacement of the hair contact member from the first end of the tress; and

control heating of the hair contact member based on the determined displacement of the hair contact member from the first end of the tress.

11 . The hairstyling device according to claim 10 , wherein the controller is configured to:

determine a target heat delivery profile along the tress using the determined speed; and

control heating of the hair contact member based on the target heat delivery profile.

12 . The hairstyling device according to claim 11 , wherein the target heat delivery profile comprises a heat delivery profile which varies along the tress.

13 . The hairstyling device according to claim 10 , wherein the controller is configured to cause a user interface to provide an output based on the determined speed.