Patent ID: 7428193
Filing Date: 2008-09-23
Classification: G11B

Abstract:
1. An optical pickup device comprising: a light source that outputs a light; an optical system through which the light is passed to thereby form a light spot on a surface of an optical recording medium; an optical system aberration correcting unit that corrects an optical system wavefront aberration that occurs while the light passes through the optical system so that the light that illuminates the surface is less in the optical system wavefront aberration; a medium aberration correcting unit that corrects a medium wavefront aberration that occurs due to an angle between the light that illuminates the surface and the surface so that the light that illuminates the surface is less in the medium wavefront aberration; and a light receiving unit that receives a light that is reflected from the surface; wherein the light source includes a first light source that outputs an irradiating light on a first optical recording medium and a second light source that outputs an irradiating light on a second optical recording medium different from the first optical recording medium, and wherein the optical system is formed to restrict within a permissible range an aberration that occurs in the light flux forming the light spot among the irradiating lights output from the first light source, and the optical system aberration correcting unit corrects only an optical system wave front aberration that occurs when the irradiating light output from the second light source passes through the optical system.