| 摘要 |
<p>PURPOSE:To constitute the titled switch without using a half mirror or the like by providing a light emitting element having a different wavelength to a position where light beams are reflected on a glass plate or transmitted through the glass plate to form one and same optical axis thereby constituting a projecting part. CONSTITUTION:A green light emitting diode 1 and a red light emitting diode 2 are arranged so that their optical axes are crossed at an angle of 90 deg. and the glass plate 3 is arranged to the crossing part with an angle of 45 deg. to each optical axis respectively. Marks 9a, 9b, 9c-are applied onto a sheet 8 with a prescribed interval. The marks 9a-are colored in green or red corresponding to the colors of the light emitting diodes 1, 2, and the optical system is arranged so that the focus of a condenser lens 7 is at the center to the marks. The light emitting diodes 1, 2 are driven alternately at each prescribed time interval and a light receiving element 11 receives each reflected light beams thereupon to detect a mark 9 on the sheet 8 being an object to be detected.</p> |
