| 摘要 |
The invention relates to a device (10) for detecting the position of at least one indicator object (11) on a screen (12). According to the invention, a light source (14) emits a light beam (16) in the direction of the screen (12) and a detector (15) measures the light (16') reflected therefrom. The detector (15) detects a change of reflection caused by the indicator object (11) touching the screen (12) and an evaluation unit (17) determines the position coordinates of the indicator object (11) on the basis of said change. The light source (14) is configured as a laser projector and the laser light beam (16) emitted from the light source scans the screen (12) in a spatially resolved manner. The evaluation unit (17) determines the position of the indicator object (11) by determining, on the basis of the time-independent scanning behavior of the emitted laser light beam (16), the position of the point of incidence of the light beam (16) on the screen that is correlated with the time of change in intensity once the detector (15) detects a change in intensity of the reflected beam (16'). |
