| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface acoustic wave optical element which ensures higher energy efficiency. SOLUTION: A generator 12 for generating surface acoustic wave, a transducer 13 and a reflector 15 are formed on a piezoelectric film 11a of a substrate, while a transducer 14 and a reflector 16 are formed on a piezoelectric film 11b. An AC voltage of E1=E0sinωt is applied to a comb-type electrode 12a, while an AC voltage of E2=E0cosωt to a comb-type electrode 12b, forming the generator 12 in order to excite the substrate 11. Thereby, the unidirectional surface acoustic wave W, traveling in the direction of arrow mark a (right side of the figure), is generated. The surface acoustic wave W traveling in the direction of the arrow mark a is converted mechanically and electrically by the transducer 14, energy of such waves is collected as the electrical vibration, it is then circulated to the transducer 13 to re-excite the substrate 11. Optical elements (moving bodies) such as a lens, a polarizer or the like arranged in the space 17 on the substrate 11 can be moved with the surface acoustic wave generated on the substrate. |
