Patent ID: 7113174
Filing Date: 2006-09-26
Classification: G06F,Y10S

Abstract:
1. A coordinate input-detecting apparatus including a touch panel to be touched by a pointer, said coordinate input-detecting apparatus comprising: a substantially flat two-dimensional coordinate input-detecting area configured to receive insertion of the pointer, said substantially flat two-dimensional coordinate input-detecting area being formed in front of the touch panel and having a prescribed depth; an optical unit configured to convert a light intensity distribution signal to digital data; and a controller configured to detect the pointer inserted into the coordinate input-detecting area when the digital data detected by the optical unit exceeds a first threshold value; wherein said controller calculates a distance between the optical unit and the pointer from the digital data, and sets a second threshold value higher than that of the first threshold in accordance with the distance calculated, and wherein said controller calculates coordinates from the digital data when the digital data exceeds the second threshold value.