Patent ID: 7703847

Claim:
A backrest with head support for a vehicle seat, comprising: a substantially upright backrest; a head support mounted in the backrest and adjustable in height with respect to the backrest from a preestablished initial position to a final position commensurate with the height of the head of a person sitting in the vehicle seat, said head support having upper and lower portions; a capacitive proximity sensor arranged in the upper portion of the head support and having a sensing field directed obliquely downward to be triggered by the upper portion of the back of the person's head; wherein said upper portion of the back of the person's head has a curvature and said sensing field has a curvature which is greater than that of said upper portion of the person's head; an indicator responsive to a proximity signal from the proximity sensor dependent on the proximity of said upper portion of the person's head to the upper portion of the head support; and means for adjusting the height of the headrest to a final position at which said proximity signal is triggered.