| 摘要 |
A position-sensing unit for determining a relative position in one or more dimensions of two units. One or more position-sensing units can be used in a multidimensional pointer, such as a control lever, for controlling a position in up to six dimensions of, e.g., and object on a display. A position-sensing unit comprises a radiation source, a detector and a screen element arranged in the beam path for partial screening off of radiation. The radiation source and the detector comprise individual or separate fields for emitting or detecting radiation, in which case it is possible to distinguish radiation associated with one field from radiation associated with other fields. The determination of a position is carried out based on a comparison between the intensities of non-screened-off radiation associated with the different fields. A radiation-spreading medium can be used in the fields to create "virtual" radiation surfaces and detector surfaces, respectively, in combination with separate radiation units and detector units, respectively. |
