| 摘要 |
PROBLEM TO BE SOLVED: To inexpensively and appropriately achieve a dust-proof effect by preventing the increase in the circuit scale of a driving control system when dust-proof optical elements together with excitation means are provided to a plurality of parts. SOLUTION: When the optical device is equipped with dust-proof glass plates 321, 323 and 325 together with piezoelectric elements for excitation 322, 324 and 326 in a plurality of optical parts 304, 310 and 314 respectively, the device is equipped with a driving control part 331 comprising a single dust-proof glass driving circuit 332 driving and controlling the piezoelectric elements 322, 324 and 326 included in the optical parts 304, 310 and 314 and a control part 333 therefor. Then, each of the piezoelectric elements 322, 324 and 326 need not be provided with a driving means or a control means, and the increase in the circuit scale of the driving control system is prevented, and the dust-proof effect is inexpensively and appropriately achieved. COPYRIGHT: (C)2006,JPO&NCIPI |
