Coordinate input apparatus and coordinate input method

Details Coordinate input apparatus and coordinate input method Coordinate input apparatus and coordinate input method

2008-05-20

2008-05-20

Shalwala, Bipin (Department: 2629)

Computer graphics processing and selective visual display system

Display peripheral interface input device

C345S173000, C345S179000

Reexamination Certificate

active

07375720

ABSTRACT:
In a coordinate input apparatus including the detection unit of a sensor unit (1R,1L) 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 (1R,1L) 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 (1R,1L), a light-receiving IC (5) detects a light emission signal from the pointer (6), and the control/arithmetic unit2controls the coordinate acquisition operation on the basis of the detection result.

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