Optical pickup apparatus
AssigneeSanyo Electric Co., Ltd.
InventorsMinoru Sato, Kiyotaka Eizumi, Chiaki Asakawa
Life of this patent
Estimating the term…
Abstract
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; and 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, 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.
Claims6
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.
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;
- and
- 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, 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 incidence polarization angle of the laser beam relative to the first reflective film is set at a rotation angle in a range of 26 to 44 degrees relative to a direction in which a reflecting surface of the first reflective film is inclined.
Dependencies are inferred from the claim text.