Varifocal lens

A varifocal lens comprising:

• a transparent substrate;
• a frame which is fixed to the transparent substrate and comprises an outer frame and an inner frame defining an inner hole and a peripheral hole which communicates with the inner hole;
• a membrane fixed to the outer frame and the inner frame, to seal optical fluid in the inner hole and the peripheral hole, the membrane comprising a central lens portion corresponding to the inner hole and a peripheral actuated portion corresponding to the peripheral hole;
• at least one actuator which changes a curvature of the central lens portion of the membrane by bending the peripheral actuated portion of the membrane;
• and
• a restriction reinforcing member, separate from the inner frame and the outer frame, which is adapted to reinforce a restrictive force of an edge of the central lens portion, the restriction reinforcing member being made of a transparent material, and being disposed to correspond to an area including the edge of the central lens portion and not a central portion of the central lens portion, and has a Young's modulus that is larger than a Young's modulus of the membrane.

A varifocal lens comprising:

• a transparent substrate;
• a frame which is fixed to the transparent substrate and comprises an outer frame and an inner frame defining an inner hole and a peripheral hole which communicates with the inner hole;
• a membrane fixed to the outer frame and the inner frame, to seal optical fluid in the inner hole and the peripheral hole, the membrane comprising a central lens portion corresponding to the inner hole and a peripheral actuated portion corresponding to the peripheral hole;
• at least one actuator which changes a curvature of the central lens portion of the membrane by bending the peripheral actuated portion of the membrane;
• and
• a lens shape altering member which is fixed to the membrane and is separate from the inner frame and the outer frame and is adapted to transform the central lens portion into a predetermined shape, the lens shape altering member being made of a transparent material, and being disposed to correspond to at least a portion of the central lens portion, and has a Young's modulus equal to or greater than a Young's modulus of the membrane.