Patent ID: 8773749

Claim:
A variable focusing lens, comprising: a single crystal electrooptic material having inversion symmetry; a first anode formed on a first surface of the electrooptic material; a first cathode that is formed on a second surface opposed to the first surface and that is formed at a position opposed to the first anode; a second cathode that is formed on the first surface and that is provided to have an interval to the first anode; and a second anode that is formed on the second surface, that is provided to be opposed to the second cathode, and that is provided to have an interval to the first cathode, wherein: an optical axis is set so that, when light enters through a third face orthogonal to the first surface, the light passes through a first pair of electrodes composed of the first anode and the first cathode and subsequently passes through a second pair of electrodes composed of the second anode and the second cathode to subsequently exit through a fourth surface opposed to the third face, and a voltage applied between the first pair of electrodes and the second pair of electrodes is changed to thereby change the focal point of light emitted from the fourth surface of the electrooptic material.