Correcting optical device and image pickup apparatus

A correcting optical device configured to correct image shake using an image pickup element on one hand and to restrict movement of the image pickup element when the image shake is not corrected on another hand, the correcting optical device comprising:

• a fixed member that rotatably supports a rotary member in a plane that is perpendicular to an optical axis of a lens;
• a movable member that is supported so as to be movable translationally with respect to the fixed member in the plane that is perpendicular to the optical axis;
• and
• a driving unit that is disposed between the movable member and the rotary member,
• wherein, on the one hand, the driving unit drives the movable member in a direction in which the movable member moves translationally with respect to the fixed member in the plane that is perpendicular to the optical axis, so that the image pickup element corrects the image shake, and
• wherein, on the other hand, the driving unit drives the rotary member in a direction in which the rotary member rotates around the optical axis, so that, when the image shake is not corrected, the driving unit causes a restricting member to engage an engaging portion, to restrict the translational movement of the movable member, and so that, when the image shake is corrected, the driving unit causes the restricting member to disengage the engaging portion, to cause the movable member to be in a state capable of the translational movement, the restricting member being provided at the rotary member, the engaging portion being provided at the movable member.

A correcting optical device comprising:

• a driving unit;
• a correcting lens wherein:
• the correcting lens is in either a locked state or a non-locked state;
• the correcting lens is driven by the driving unit in translational motion that compensates for image shake in a plane perpendicular to the optical axis, when the correcting lens is in the non-locked state;
• and
• the correcting lens is prevented from translation motion that compensates for image shake in the plane perpendicular to the optical axis by a restricting member, when the correcting lens is in the locked state;
• and
• the driving unit places the correcting lens in either the locked state or the non-locked state by rotating the correcting lens.