| 摘要 |
<p>Eye detection apparatus intended for use together with e.g. a computer monitor (7) and for detecting the presence, position and/or gaze direction of a person looking on the monitor includes illuminators (2' 2") and a light detector (3) placed at an edge of the monitor. A single optical filter plate (6) is arranged at the same edge for filtering light to be sensed by the light detector and light emitted by at least one of the illuminators. The filter plate (6) hides the at least one illuminator (2' 2") and the light detector (3) from being directly observed by the person to be studied. The light detector (3) and the at least one illuminator (2' 2") are positioned relative to one another, relative to the single optical filter plate (6), relative to the refractive properties of the filter plate (6) in respect of the light emitted from the at least one illuminator (2', 2") and an angle of the emitted light that first order back reflections in a front surface of the filter plate (6) facing the person are prevented from reaching the light detector.</p> |
