| 摘要 |
<p>PURPOSE:To specify and input desired coordinates on a large-sized screen from a sufficiently distance place, to facilitate screen operation on the large-sized screen and to meet a manager's demand. CONSTITUTION:This projection system which projects an image, projected by a projection device 13, on the large-sized screen according to an operation indication from a remote controller 11 is equipped with a coordinate specification device 20 which projects infrared light on the desired coordinates in the image projected on the large-sized screen 14, a coordinate detection device 16 which has many infrared light detecting elements arrayed in specific order on the reverse side of the large-sized screen and detect the infrared light projected from the coordinate specification device 20, and a coordinate detecting means 11 which calculates the nearly center coordinates of the infrared light projection according to the detection signal of the coordinate detection device 16.</p> |
