Patent ID: 8331193
Filing Date: 2012-12-11
Classification: H03K

Abstract:
1. A lighting system comprising: a lamp arranged to transform electricity into a light beam having properties such as intensity, color, color temperature, direction and beam cone angle; a light control means arranged to adjust said light beam properties; an ultrasonic transmitter arranged to transmit ultrasonic signals; an ultrasonic receiver arranged to receive reflected ultrasonic signals; wherein said ultrasonic transmitter and/or receiver are mounted on a rotatable carrier such that the beam of said transmitter and/or the reception cone of said receiver extend parallel to and at a distance from the axis of rotation, wherein driving means are present to rotate said carrier; and a rotatable carrier, wherein said ultrasonic transmitter and/or receiver are mounted on said rotatable carrier; a step driving means for rotating said rotatable carrier at a multitude of angular positions step by step; and a processing means arranged to send an ultrasonic pulse through said transmitter when said rotatable carrier is rotated one step and to determine after each pulse is sent if said receiver receives a reflected ultrasonic signal with an amplitude exceeding a predetermined threshold within a predetermined period, and to send control signals to said light control means in dependence of said determination.