Patent ID: 7557993
Filing Date: 2009-07-07
Classification: G02B,G11B

Abstract:
1. An optical pickup comprising: beam separation/composition means for separating the identical optical path of an incoming first optical beam and an incoming second optical beam into optical paths directed to a first objective lens and a second objective lens corresponding to the optical beams respectively, and combining optical paths of a first reflected optical beam and a second reflected optical beam which are brought about when the first optical beam and the second optical beam are reflected by an optical disc respectively so as to output the reflected optical beam along an optical path different from the optical path of the first optical beam and the second optical beam toward a light receiving element; a first collimator lens that is arranged between the beam separation/composition means and the first objective lens; and a second collimator lens that is arranged between the beam separation/composition means and the second objective lens, wherein, when it is determined that the focal distance of the first objective lens is Fobj