Optical head device and optical apparatus using the same

摘要

An optical head device includes a focusing optical system for focusing a laser beam emitted from a semiconductor laser light source (10) on an optical information medium (3) with an objective lens (1). A chromatic aberration correction element (7) for correcting chromatic aberration occurring in the objective lens (1) is provided between the semiconductor laser light source (10) and the optical information medium (3). A light distribution correction element (6) in which the transmittance increases with the distance from the center of the aperture surface of the objective lens (1) is provided so as to correct a reduction of the intensity of the light incident on the aperture surface of the objective lens (1) with the distance from the center of the aperture surface. <IMAGE>