Door bell or door station for apartment station, comprises projection unit and projection surface, where projection unit comprises control unit, in which memory unit, projector and light reflection sensor are connected

摘要

The door bell or door station (22) comprises a projection unit (1) and a projection surface (15), where the projection unit comprises a control unit (2), in which a memory unit (4), a projector (5) and a light reflection sensor (6) are connected. The light reflection sensor monitors the tactile surfaces (16,18,20) and the control unit signals a selected tactile surface.