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US 2010/0246369 A1Published application
Optical Pickup Apparatus
AssigneeSanyo Electric Co., Ltd.
InventorMinoru Sato
Life of this patent
Estimating the term…
Abstract
An optical pickup apparatus comprising: a laser light source; an objective lens; a reflection mirror; a photodetector; and a beam splitter, the beam splitter including a first reflective film configured to generate a first phase difference corresponding to a predetermined wavelength with respect to laser light, the reflection mirror including a second reflective film configured to generate a second phase difference corresponding to the predetermined wavelength with respect to the laser light, the first reflective film and the second reflective film being formed so that a combined phase difference of the first phase difference and the second phase difference becomes substantially quarter-wave with respect to the laser light.
Claims8
An optical pickup apparatus comprising:
- a laser light source configured to emit laser light having a predetermined wavelength;
- an objective lens configured to apply the laser light to an optical recording medium;
- a reflection mirror interposed in a optical path between the laser light source and the objective lens, the reflection mirror configured to reflect the laser light so that the laser light is allowed to be incident on the objective lens;
- a photodetector configured to receive reflected light obtained by reflecting the laser light from the optical recording medium;
- and
- a beam splitter interposed in a optical path between the laser light source and the reflection mirror, and arranged so that the laser light is reflected from the beam splitter in a direction of the reflection mirror, and the reflected light is allowed to pass through the beam splitter in a direction of the photodetector,
- the beam splitter including a first reflective film configured to generate a first phase difference corresponding to the predetermined wavelength with respect to the laser light,
- the reflection mirror including a second reflective film configured to generate a second phase difference corresponding to the predetermined wavelength with respect to the laser light,
- the first reflective film and the second reflective film being formed so that a combined phase difference of the first phase difference and the second phase difference becomes substantially quarter-wave with respect to the laser light emitted from the laser light source.
6 more elements
An optical pickup apparatus comprising:
- a first laser light source configured to emit first laser light having a first wavelength;
- a second laser light source configured to emit second laser light having a second wavelength different from the first wavelength;
- an objective lens configured to apply the first laser light and the second laser light to an optical recording medium;
- a reflection mirror interposed in a common optical path between the first laser light source as well as the second laser light source and the objective lens, the reflection mirror configured to reflect the first laser light and the second laser light so that the first laser light and the second laser light are allowed to be incident on the objective lens;
- a photodetector configured to receive reflected light obtained by reflecting each of the first laser light and the second laser light from the optical recording medium;
- and
- a beam splitter interposed in a common optical path between the first laser light source as well as the second laser light source and the reflection mirror, and arranged so that the first laser light and the second laser light are reflected from the beam splitter in a direction of the reflection mirror, and the reflected light is allowed to pass through the beam splitter in a direction of the photodetector,
- the beam splitter including a first reflective film configured to generate a first phase difference corresponding to the first wavelength and the second wavelength with respect to each of the first laser light and the second laser light,
- the reflection mirror including a second reflective film configured to generate a second phase difference corresponding to the first wavelength and the second wavelength with respect to each of the first laser light and the second laser light,
- the first reflective film and the second reflective film being formed so that a combined phase difference of the first phase difference and the second phase difference becomes substantially quarter-wave with respect to each of the first laser light and the second laser light emitted from the first laser light source and the second laser light source.
7 more elements
Dependencies are inferred from the claim text.