Patent ID: 7460308

Claim:
A liquid lens comprising: a chamber having a hole formed therein; and insulating and electrolytic non-miscible fluids housed in the hole, with the insulating fluid located at a bottom side, to form a spherical interface, the insulating and electrolytic fluids having different refractivities, wherein the hole has a height greater than or equal to a bigger one of a height of an initial interface before electrowetting occurs and a height of a final interface when electrowetting has occurred to a maximum amount, wherein the initial interface has a height according to following Equations 1 and 2, y = X ⁢ ⁢ tan ⁢ ⁢ ( θ ′ / 2 ) , Equation ⁢ ⁢ 1 X = R ⁡ [ tan ⁢ ⁢ α tan ⁢ ⁢ α - tan ⁡ ( θ ′ / 2 ) ] , Equation ⁢ ⁢ 2 wherein y is a value of the height, X is a radius of an uppermost end of the hole, R is a radius of a lowermost end of the hole, θ′ is a contact angle at the initial interface −π/2, and α is an inclination angle of an inner wall of the hole.