Patent ID: 8427921

Claim:
An optical pickup apparatus applying a laser beam to an optical recording medium and detecting the laser beam reflected by the optical recording medium, comprising: a light emitting device emitting a plurality of laser beams used for reading or writing in optical recording media through an objective lens, the light emitting device comprising, a first light emitting source configured to emit a first laser beam, a second light emitting source configured to emit a second laser beam having a wavelength longer than a wavelength of the first laser beam, and a third light emitting source configured to emit a third laser beam having a wavelength longer than the wavelength of the second laser beam, wherein the third light emitting source is disposed closest to an optical axis of the optical pickup apparatus, the first light emitting source is disposed at one side of the third light emitting source, and the second light emitting source is disposed at the other side of the third light emitting source; a first light receiver configured to receive the first laser beam reflected by one of the optical recording media; and a second light receiver configured to receive the second laser beam and the third laser beam each reflected by one of the optical recording media, wherein the objective lens is compatible with all the wavelengths of the first to third laser beams and having such a characteristic that a phase direction of coma aberration generated in the second laser beam and a phase direction of coma aberration generated in the third laser beam are opposite to each other.