Movable reflective element and two-dimensional scanning device

A movable reflective element, comprising:

• a plate-like fixed frame;
• a plate-like movable frame disposed within the fixed frame to define a gap between the movable frame and the fixed frame;
• a plate-like mirror including a reflective surface and disposed within the movable frame to define a gap between the mirror and the movable frame;
• first actuators that are a pair of linear flexible members, each first actuator connecting the fixed frame to the movable frame and including piezoelectric elements formed in an extension extending in a first direction from an inner side of the fixed frame, the piezoelectric elements stretching and contracting in the first direction, the first actuators being disposed one on either side of the movable frame in a second direction that intersects the first direction, wherein deformation of the first actuators caused by stretching and contracting of the piezoelectric elements oscillates the movable frame about a first rotation axis in relation to the fixed frame;
• and
• second actuators that are a pair of linear flexible members, each second actuator connecting the movable frame to the mirror and including piezoelectric elements formed in an extension extending in the second direction from an inner side of the movable frame, the piezoelectric elements stretching and contracting in the second direction, the second actuators are disposed one on either side of the mirror in the first direction, wherein deformation of the second actuators caused by stretching and contracting of the piezoelectric elements oscillates the mirror about a second rotation axis in relation to the movable frame, the second rotation axis intersecting the first rotation axis,
• wherein the extension of each first actuator in the first direction has a length that is longer than a distance between the inner side of the fixed frame to which the first actuator is connected and a middle point of an outer side of the movable frame in the first direction.