DEVICE FOR HAIR CARE WITH HAIR SENSOR BASED ON LIGHT Russian patent published in 2017 - IPC A61B5/00 

FIELD: human vital needs satisfaction.

SUBSTANCE: hair care device contains a sensor for detecting hair next to the skin surface. The sensor comprises a light source for forming a light beam with an initial polarization direction, a polarization modulator for time-dependent modulation of the polarization direction of the light beam between at least the first polarization direction and the second polarization direction, optical elements for focusing the light beam on the hair near the skin surface and sensitive to polarize the light-based detection unit to detect light interacting with the hair or skin surface and for recognizing when the interacting light has a polarization direction component different from the original direction of polarization.

EFFECT: invention allows to improve the contrast of hair-skin for different hair orientations.

13 cl, 4 dwg