Patent ID: 7345983

Claim:
An optical pickup apparatus comprising: a first light source for emitting a first light flux with a wavelength λ 1 ; a second light source for emitting a second light flux with a wavelength λ 2 which is longer than the wavelength λ 1 ; a third light source for emitting a third light flux with wavelength λ 3 which is longer than the wavelength λ 2 ; a packaged multiple light source unit for packaging emitting points of at least two of the first-third light sources in one housing; an objective optical system for converging light fluxes emitted by at least three kinds of light sources respectively having different wavelengths λ 1 , λ 2 and λ 3 onto information recording surfaces of at least three kinds of optical disks respectively having different information recording densities; and a magnification adjusting optical unit having an actuator and a movable lens group and being arranged in an optical path between the packaged multiple light source unit and the objective optical system, wherein the movable lens group is driven by the actuator along the optical axis so as to change a magnification of the objective optical system according to a wavelength of a light flux emitted by the packaged multiple light source unit.