| 摘要 |
PROBLEM TO BE SOLVED: To miniaturize a drive mechanism by providing a rotor, a ceramic vibrator for giving rotary force to the rotor, and a drive body that is operated in linking with the rotation of the rotor. SOLUTION: The iris mechanism of a video camera slides stop blades 2 and 3 each other, and changes an opening 4 for adjusting the quantity of light. Then, when a rotor 15 is rotated in a direction of S1, a rotary arm 17 is rotated in the direction of S1 for operating the stop blade 2 in a direction of Z2 and at the same time operating the blade 3 in a direction of Z1 for gradually increasing the opening. On the other hand, when the rotor 15 is rotated in a direction of S2, the opening 4 gradually decreases. Also, when a ceramic vibrator 9 is allowed to conduct electricity from an AC power supply, synthesis vibration consisting of two modes of the bending mode of flex vibration for inducing standing waves in the longitudinal direction and a longitudinal vibration mode for expanding and contracting in the longitudinal direction is generated for exhibiting operation force, thus eliminating the need for arranging each component of a drive mechanism in series and hence miniaturizing the drive mechanism. |
