Patent ID: 7976174
Filing Date: 2011-07-12
Classification: G03B

Abstract:
1. A method for projecting at least one first optical projection onto a first projection surface, in which a monitoring zone that surrounds said first projection surface is scanned with the aid of at least one working laser beam that is not hazardous to the human eye, such that the working laser beam, of which at least one must be present, is positioned at various scanning locations in the monitoring zone, and at least one measuring signal is acquired for the light from the working laser beam that is reflected by the scanning locations, and the measured signal, of which at least one must be present, is compared with at least one reference signal, and the first optical projection is projected depending on the results of said comparison by means of a projection laser beam that has a rated power greater than the working laser beam onto the first projection surface, and with the aid of a working laser beam, of which at least one must be present, at least one second optical projection is projected onto a second projection surface located outside of the monitoring zone; wherein the first projection surface is located inside a hall, and is positioned at a distance from the floor of the hall, and the second projection surface is located on the floor of the hall.