| 摘要 |
PURPOSE:To make high-speed and high-precision control possible and to make the whole of a device compact by providing the first pair of electrodes which generate a surface acoustic wave in the direction intersecting approximately orthogonally with the advancing direction of the rays of light and the second pair of electrodes which generate a surface acoustic wave in the direction opposite to the advancing direction of the rays of light and connecting both pairs of electrodes to high frequency power sources. CONSTITUTION:When a high frequency is applied to the first pair of electrodes 14, a surface acoustic wave 19A is generated on a waveguide 10 from the part of electrodes 14 in the X direction intersecting orthogonally with the advancing path 13A of an optical beam, and the optical beam passing in the waveguide is deflected in the X direction with a larger angle according as the frequency is higher. When a high frequency is applied to the second pair of electrodes 16 from a power source 15B, a surface acoustic wave 19B is generated on the waveguide 10 from the second pair of electrodes 16 in the direction opposite to the advancing direction of the optical beam 13, and the length by which the optical beam 13 advances straightly in the waveguide 10 is shortened in accordance with the frequency is higher, and the optical beam is emitted from the midway of the waveguide in the exit position which is changed in accordance with the frequency. The optical beam 13 is converted and condensed similarly to a conventional manner and is projected to a screen. |
