| 摘要 |
According to one aspect of the invention, a coordinate input apparatus for calculating a position of an object positioned on an input area comprises: a light projecting unit; retroreflecting members arranged along two opposite sides of a rectangular area including the input area, and having a reflecting surface which reflects the light emitted by the light projecting unit; a light receiving unit; and a calculation unit configured to calculate the position of the object based on a measurement result from the light receiving unit, wherein a set of the light projecting unit and the light receiving unit arranged adjacent to the retroreflecting member to sandwich the retroreflecting member in a direction perpendicular to a surface of the input area are positioned in at least two portions of each of the retroreflecting members arranged on the two opposite sides. |
