| 摘要 |
A headrest has a generally stationary support, a headrest body having a forwardly directed front face and positioned such that a head of a user seated in front of the support is generally level with the body, and a guide securing the body to the support for vertical movement relative to the support. A drive can vertically shift the body relative to the support. A sensor assembly has at least three horizontally elongated and vertically spaced electrodes carried on the front face. A controller connected to the electrodes and to the drive means detects a vertical position of the user's head relative to the body and displaces the body so as to centrally align with the user's head.
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