| 摘要 |
An optical reading apparatus includes an objective lens for focusing an optical beam; an actuator for driving the objective lens; an aberration detector for detecting spherical and coma aberration of the optical beam; an aberration correction element, including a liquid crystal element, for correcting the spherical and coma aberration by applying voltages to the liquid crystal element; a lens location detector for detecting displacement of the objective lens with respect to a reference location; and a controller for controlling the amount of aberration correction of the aberration correction element in accordance with the spherical aberration, the coma aberration, and the displacement.
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