Patent ID: 8300514
Filing Date: 2012-10-30
Classification: G11B

Abstract:
1. An optical pickup device comprising: a light source; an objective lens focusing light emitted from the light source on an information recording surface of an optical disc; a movable lens arranged in an optical path between the light source and the objective lens, the movable lens moving in an optical axis direction to vary a rate of convergence or divergence for light reaching the objective lens; lens-position adjusting means for adjusting a position of the movable lens; and temperature monitoring means for monitoring ambient temperature, wherein the lens-position adjusting means is adapted to adjust the position of the movable lens to correspond to the ambient temperature, the objective lens is arranged to be tilted with respect to an optical axis of light reaching the objective lens from the movable lens, wherein a first coma aberration be in a coma aberration of which produced varies according to movement of the movable lens due to the objective lens being tilted, and a second coma aberration be in a coma aberration of which an amount produced varies due to variation in a warping state of the optical disc that is caused along with variation in the ambient temperature, and a tilting direction of the objective lens is adjusted such that the first coma aberration occurs in a radius direction of the optical disc and such that amounts of the first coma aberration and the second coma aberration produced increase or decrease in opposite directions with respect to the ambient temperature.