| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an optical scanning touch panel capable of exactly detecting the position of a pointer by preventing dust from being stuck on an optical member in an optical unit and preventing the characteristics of the optical member from being degraded. SOLUTION: Outside both the corners of one short side of a rectangular display screen 10, optical units 1a and 1b are respectively provided while internally having an optical system provided with a light emitting element, a light receiving element and a polygon mirror, the angle of light from the respective optical units 1a and 1b is scanned, that scanning light reflected on a recursive reflection sheet 7 is received and the shield position of scanning light formed by a pointer S is detected on the basis of the level of reflected light corresponding to the scanning angle. Each of the optical units 1a and 1b is provided with a dust-proof structure for preventing dust from being infiltrated from the outside.</p> |
