| 摘要 |
An aberration correction element is intended to correct an aberration. The aberration correction element is placed in a middle of an optical path between a light source and an optical element for focusing a light on the information recording medium. The aberration correction element is provided with: a first electrode; a liquid crystal element; second electrodes which are arranged in a form of multiple layers in a direction of the optical axis; and outgoing lines for individually applying a voltage to the second electrodes. At least one of second electrodes is placed between the outgoing line for applying the voltage to another second electrode other than one second electrode which is placed on the closest side to the liquid crystal element and the liquid crystal element which faces the outgoing line in the direction of the optical axis;
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