MEDICINSK APPARAT FOR OVERVAKNING OCH/ELLER REGISTRERING AV RORELSER HOS EN PERSON PA EN BEDD

摘要

A capacitive motion sensor placed under a mattress or the like for monitoring the movements of a person. The sensor uses an active layer consisting of two courses of dielectric material placed in contact with one another. Movements of a person on top of the mattress cause the courses to move relative to one another, thereby generating an electric change in the active layer which is detected by a pair of spaced elements which form a capacitive antenna means.