| 摘要 |
A position detector for a scanning device includes a movable light blocker, at least two light detectors which are located behind the light blocker and which can be covered by the light blocker at different extents of coverage as the light blocker is being moved, so that the position of the light blocker can be determined, and at least one light source for emitting light onto the light detectors. A reflector is provided which is located in front of the light blocker. The light source is arranged such that the light emitted therefrom is emitted onto the reflector. Furthermore, the reflector is arranged such that the light impinging thereon is reflected onto the light detectors. |
