Apparatus and method for contactless input

Abstract

An apparatus for contactless input 10 having an optical image formation means 13 having cross disposed first and second reflective surfaces 20, 21 arranged numerously and standing on a same planar surface, a display 11 provided on one side of the optical image formation means 13, and a light sensor 26 detecting only light from the front side and arranged side by side, wherein a first real image 12 is formed on the other side of the optical image formation means 13 by the optical image formation means 13 from an image 11a on the display 11; a second real image 35 is formed on the display 11 through the optical image formation means 13 from reflected light from an indicating means 34 having come into contact with the first real image 12, and a position of the second real image 35 is detected by the light sensor 26.

1 . A sheet-like infrared sensor sheet provided on the surface of a display, comprising:
 a plurality of infrared sensor elements arranged in a grid pattern,   wherein on the back of the infrared sensor elements, non-transmissive materials are provided to make the infrared sensor elements detect only light from the front side.   
     
     
         2 . The infrared sensor sheet according to  claim 1 , wherein the display emits red, green and blue lights, and also emits infrared lights.