| 摘要 |
In a coordinate input apparatus including the detection unit of a sensor unit ( 1 R, 1 L) arranged at a corner of a coordinate input region ( 4 ), a retroreflecting member ( 3 ) arranged at the peripheral portion of the coordinate input region ( 4 ) to retroreflect incident light, the light projecting unit of the sensor unit ( 1 R, 1 L) which projects light to the coordinate input region ( 4 ), and a control/arithmetic unit ( 2 ) which executes a coordinate acquisition operation for obtaining the coordinate position of a pointer ( 6 ) having a light-emitting function in the coordinate input region ( 4 ) on the basis of a light amount distribution obtained from the detection unit of the sensor unit ( 1 R, 1 L), a light-receiving IC ( 5 ) detects a light emission signal from the pointer ( 6 ), and the control/arithmetic unit 2 controls the coordinate acquisition operation on the basis of the detection result.
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