VIBRATION TYPE ACTUATOR, OPTICAL INSTRUMENT AND IMAGING APPARATUS

• Main Author: OSAWA KAZUHARU
• Format: Patent
• Language: English; Japanese
• Published: 14.04.2016
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; GENERATION; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

PROBLEM TO BE SOLVED: To make separation of an elastic member from a piezoelectric element hardly occur in a vibration type actuator using a vibrator obtained by sticking the piezoelectric element and the elastic member together.SOLUTION: An ultrasonic motor 1 comprises: a vibrator 11 obtained by sticking a piezoelectric element 111 and an elastic member 112 together; a driven member 12 which is relatively driven with respect to the vibrator 11; and a pressurization member 13 which presses the vibrator 11 to the driven member 12. An elastic vibration part 112a vibrates with the piezoelectric element 111, and a pressurized part 112c extends in a D1 direction from the elastic vibration part 112a and receives pressurization force applied by the pressurization member 13. A vibrator holder 14 holds the vibrator 11 via the pressurization member 13. When seen from a direction orthogonal to the D1 direction and the pressurization direction (D2 direction), since a portion connected to the pressurization member 13 in the vibrator holder 14 is formed in a direction different from the D1 direction as an inclined part 14a, the moment acting in a direction reverse to a direction of separating the elastic member 112 from the piezoelectric element 111 is given in advance.SELECTED DRAWING: Figure 1 【課題】圧電素子と弾性部材を貼り合わせた振動子を用いる振動型アクチュエータにおいて、圧電素子と弾性部材との剥がれを起きにくくすること。【解決手段】超音波モータ１は、圧電素子１１１と弾性部材１１２を貼り付けた振動子１１と、振動子１１に対して相対的に駆動される被駆動部材１２と、振動子１１を被駆動部材１２に圧接させる加圧部材１３を備える。弾性振動部１１２ａは圧電素子１１１とともに振動し、被加圧部１１２ｃは弾性振動部１１２ａからＤ１方向に延出して、加圧部材１３による加圧力を受ける。振動子ホルダ１４は加圧部材１３を介して振動子１１を保持する。Ｄ１方向及び加圧方向（Ｄ２方向）と直交する方向から見た場合、振動子ホルダ１４にて加圧部材１３と接続される部分は傾斜部１４ａとしてＤ１方向と異なる方向に形成されているので、弾性部材１１２を圧電素子１１１から剥がす方向とは逆方向に作用するモーメントが予め与えられる。【選択図】図１