Patent ID: 6710767
Filing Date: 2004-03-23
Classification: G06F

Abstract:
A coordinate input apparatus for generating coordinates corresponding to a light spot produced by a designating tool, comprising:first image sensing means, which is constructed on a first coordinate axis by a first image-forming optical system and a first linear sensor, for sensing the light spot; second image sensing means, which is constructed on a second coordinate axis by a second image-forming optical system and a second linear sensor, for sensing the light spot; and light diffusing means for diffusing the image width of the light spot formed by each of said first and second image-forming optical systems; wherein the first and second coordinate axes are orthogonal and an image width of the light spot formed by each of said first and second image-forming optical systems is diffused by the light diffusing means to several times the pixel pitch of the corresponding first and second linear sensors such that the light spot is sensed in several pixels of the first and second image sensing means.