| 摘要 |
<p>PROBLEM TO BE SOLVED: To generate a control instruction based on light beams projected on a screen by means of an optical indication device and to input it to a personal computer. SOLUTION: Since the light beams outputted from the optical indication device 30 are not polarized light, the light beams of the optical indication device 30, which are reflected on the screen 12, pass through a projection lens 24, are separated into two polarized components in a polarized beam splitter 25 and are projected on a liquid crystal display device 23 and a two-dimensional optical sensor 26. The two-dimensional optical sensor 26 converts a projected video into a video signal b1 and supplies it to an indication signal processing circuit 27. The indication signal processing circuit 27 checks to which part of the screen 12 the light beams emitted from the optical indication device 30 are projected based on the video signal b1 of the detection result of the two-dimensional optical sensor 26. The control instruction is generated based on information and it is transmitted to the personal computer 11 as a control signal c1.</p> |
