Patent ID: 8315140
Filing Date: 2012-11-20
Classification: G11B

Abstract:
1. An optical pickup apparatus, comprising: a laser light source configured to emit a laser beam; an objective lens configured to apply the laser beam to an optical recording medium; a beam splitter including a first reflective film configured to reflect the laser beam so as to be directed to the objective lens, the beam splitter interposed in an optical path between the laser light source and the objective lens; and a reflective mirror including a second reflective film configured to reflect the laser beam so as to be directed to the objective lens, the reflective mirror interposed in an optical path between the beam splitter and the objective lens, wherein an incidence polarization angle of the laser beam relative to the first reflective film being set such that a P-polarization component is greater than an S-polarization component in linear polarization components of the laser beam incident on the first reflective film, and the first reflective film and the second reflective film cause a combined phase difference of substantially ±90 degrees in the laser beam emitted from the laser light source.