PROBLEM TO BE SOLVED: To provide a shift mechanism for an optical element which, though small, can quickly shift the optical element by a relatively large distance and also to provide an imaging device and an endoscope system.SOLUTION: When power is supplied to piezoelectric elements 52, the two piezoelectric elements 52 elongate by the same amount, but since notches are spread out at this time, oscillation occurs, so that the angle of link parts 51a holding the notches therebetween widens. Since a rectangular frame 51 deforms such that the notches become narrower, the distance between installation parts 51h becomes wider. Thus the objective optical system 24 instantaneously displaces in an oblique direction of a CCD (with respect to a pixel sequence). The amount of the displacement is more than five times the elongation amount of the piezoelectric elements 52. When the power supply is stopped, the piezoelectric element 52 contracts, so that the rectangular frame 51 restores to the original state.COPYRIGHT: (C)2014,JPO&INPIT【課題】小型でありながら、迅速に比較的大きな距離だけ光学素子をシフトできる光学素子のシフト機構、撮像装置及び内視鏡システムを提供する。【解決手段】圧電素子52に給電すると、2つの圧電素子52が同じ量だけ伸張するが、このとき切欠を押し広げるので、切欠を挟むリンク部51aの角度が広がるように揺動する。このとき、切り込みが狭まるように矩形枠51が変形するので、設置部51h間の距離が拡大するようになる。これにより、対物光学系24は、CCDの斜め方向(画素並びに対して)に瞬時に変位する。変位量は、圧電素子52の伸縮量の5倍以上である。給電を停止すると、圧電素子52は縮むので矩形枠51は元に戻る。【選択図】図4
