Optical pickup device, optical information recording and reproducing apparatus and objective lens

摘要

An optical pickup device comprises a light source to emit a light flux having wavelength lambda; an objective lens including at least two plastic lenses of a first plastic lens having positive refractive power and a second plastic lens having positive refractive power, wherein the first plastic lens and the second plastic lens are arranged in this order from the light source side; and an actuator to drive the objective lens; wherein the objective lens satisfies the following expression (1-1): -0.0004<DELTA3SA/(NA<4>.f.(1-m))<0.0004 (1-1) where Delta3SA (lambdaRMS) represents a rate of change of a third order spherical aberration of the objective lens when the temperature of an entire body of the objective lens uniformly changes, f (mm) represents the focal length of the objective lens for the light flux having wavelength lambda, and m represents the magnification of the objective lens.