| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an optical coordinate input detecting device capable of effectively utilizing light flux emitted by a light-emitting means without waste. SOLUTION: For this detecting device, when making a light beam emitted from a light-emitting means 21 into light flux in a fixed size by a collimate optical system 26, the width of that light flux is reduced rather than the short side width of the reflection area of a recursive reflecting means 17, so that the light beam emitted from the light emitting means 21 can be effectively utilized without waste, without protruding the light flux collimated by the collimate optical system 26 from the reflection area of the recursive reflecting means 7.</p> |
