Abstract: A variable focal length lens, as well as a focal length adjusting device and an imaging device using the same. A variable focal length lens has a lens, a positive electrode, and a negative electrode. A second layer and a first layer constituting the lens are formed from polyvinyl chloride with which a plasticizer has been mixed. The hardness of these layers is adjusted by adjusting the mixing quantity, plasticizer type, etc. The second layer is formed so as so cover at least a light transmission region of the first layer. When a voltage is applied between the positive electrode and the negative electrode, the second layer and first layer are deformed to be pulled to the positive electrode, and thereby the curvature of the variable focal length lens is varied to vary the focal length.

Abstract: A variable focal length lens having a simple structure and capable of being used for applications requiring small size is provided, as well as a focal length adjusting device and an imaging device using the same. A variable focal length lens 10 has a lens 11, a positive electrode 13, and a negative electrode 14. A second layer 11b and a first layer 11a constituting the lens 11 are formed from polyvinyl chloride with which a plasticizer has been mixed. The hardness of these layers is adjusted by adjusting the mixing quantity, plasticizer type, or etc. The second layer 11b is formed so as so cover at least a light transmission region of the first layer 11a. When a voltage is applied between the positive electrode 13 and the negative electrode 14, the second layer 11 b and first layer 11 a are deformed to be pulled to the positive electrode 13, and thereby the curvature of the variable focal length lens 10 is varied to vary the focal length.