Abstract
A dynamic focusing lens with a completely new mechanism that can be miniaturized and allows for a quick-response has been developed. This lens is structured to directly transform the lens shape as a crystalline lens of the human eye. The lens is comprised of two thin glass diaphragms as a refracting surface, with a transparent working fluid sealed between them, and a new type of piezoelectric bimorph actuator. The displacement of the actuator is enlarged by the bimorph structure. The generated force is determined by the layer number of the bimorph cells. When the actuator is driven to push or pull the glass diaphragm at the actuator side, the other glass diaphragm is transformed into a lens shape (convex lens or concave lens) having various curvatures. The focal length of the lens is controlled by the applied voltage to the actuator. The dynamic focusing lens shows quick response up to 150 Hz. When the lens is operated over 60 Hz, human visual perception cannot recognize the change of the focal length, and we can observe many images having different focal lengths simultaneously.
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