| 摘要 |
A method and apparatus for indicating the position of a cursor on a surface in first and second different directions. The cursor is mounted on a member such as a gantry, and the gantry is guided for movement in the first direction on a carriage. The carriage is mounted for movement in the second direction on a member such as a rail. Radiation reflection strips extending and an acute angle with respect to one another are mounted on the gantry, and adapted to reflect light from a linear light source on said rail and extending in the second direction. Reflected light is sensed by a linear detector on said rail, for producing signals corresponding to the locations from which light was reflected. The coordinates of the cursor are determined by triangulation from these signals.
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