Patent ID: 8390934

Claim:
A liquid lens capable of adjusting focus based on an electrical signal, comprising: a container which has a cavity of which the side cross section has a hemispherical shape and contains an insulating liquid droplet and a conductive liquid droplet which are not mixed in the cavity and have the same density; a fluid pressure plate where a fluid pressure passage and a second electrode are formed on a surface thereof and the second electrode is disposed to be in contact with the conductive liquid droplet and which is combined with a bottom surface of the container so that the fluid pressure passage is disposed on a bottom surface of the cavity of the container; and an upper substrate which is combined with a top surface of the container to seal a top surface of the cavity of the container, wherein the container includes an outer wall where the cavity is formed, a first electrode which is formed on an inner side surface of the outer wall and of which the one end is connected to an external power supply, and a first insulating film which is laminated on a surface of the first electrode and is in contact with the conductive liquid droplet and the insulating liquid droplet, and wherein focus adjustment is performed by deformation in a shape of an interface between the insulating liquid droplet and the conductive liquid droplet contained in the cavity in response to a voltage applied from the external power supply through the first electrode and the second electrode and a pressure exerted through the fluid pressure passage.