Patent ID: 6956192
Filing Date: 2005-10-18
Classification: G11B

Abstract:
1. An optical head comprising: a first light emitting unit configured to emit a first light beam having a first wavelength and a first optical axis; a second light emitting unit configured to emit a second light beam having a second wavelength greater than the first wavelength and a second optical axis; a polarizing unit configured to polarize the first and second light beams respectively emitted from the first and second light emitting units, and reflects a first reflected light and a second reflected light which are obtained when the first and second light beams are reflected from an optical disk, respectively; a converging unit configured to converge the first and second light beams transmitted through the polarizing unit on the optical disk; a detecting unit configured to detect the first and second reflected lights reflected from the polarizing unit; and a diffracting unit provided on optical paths of the first and second reflected lights, which are located between the polarizing unit and the converging unit, the diffracting unit being configured to diffract the first and second reflected lights, wherein the first and second light emitting units are provided such that when the first and second light beams are incident on the converging unit, one of the first and second optical axes of the first and second light beams diverges from the other by a predetermined angle.