Patent ID: 7345983
Filing Date: 2008-03-18
Classification: G11B

Abstract:
1. An optical pickup apparatus comprising: a first light source for emitting a first light flux with a wavelength λ a second light source for emitting a second light flux with a wavelength λ a third light source for emitting a third light flux with wavelength λ 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 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.