Patent ID: 7903097

Claim:
A coordinate position detecting apparatus, comprising: a scanning unit that scans a predetermined scanning area in predetermined scanning precision along a horizontal direction and a vertical direction with respect to a display screen by employing detection beams respectively; wherein a position of a light shielding article on the display screen is detected in correspondence with scanning positions of the detection beams which are light-shielded; wherein the scanning unit includes: a drive control unit that switches a plurality of scanning modes having different scanning accuracies from each other; and a moving speed detecting unit that detects a moving speed of the light shielding article; and wherein the plurality of the scanning modes include: a first scanning mode for performing a grid-shaped scanning operation over an entire scanning area on the display screen; a second scanning mode for performing an oblique scanning operation while limiting a scanning area to a narrower range than the entire scanning area, the narrower range containing a coordinate position detected in the first scanning mode; and a third scanning mode for performing the oblique scanning operation under which a total number of the light receiving elements for detecting the detection beam emitted from a single light emitting element is smaller than that of the second scanning mode, while limiting a scanning area to a narrower range than the entire scanning area, the narrower range containing a coordinate position detected in the first scanning mode.