Optical pickup device
AssigneeKabushiki Kaisha Sankyo Seiki Seisakusho
InventorTadashi Takeda
Life of this patent
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Abstract
In an optical pickup device, a first light source and a second light source, light emission points of which are not on an identical optical axis, are provided. A first laser light beam and a second laser light beam, wavelengths of which are different from each other, are respectively emitted from the first and second light sources. The first and second laser light-beams reflected from an optical recording medium are diffracted based on different diffraction order, such that the diffracted first and second laser light beams are received by a common light receiving element.
Claims7
A light receiving method in an optical pickup device, comprising the steps of:
- providing a first light source and a second light source, light emission points of which are not on an identical optical axis;
- providing a common light receiving element;
- emitting a first laser light beam and a second laser light beam respectively from the first and second light sources, wavelengths of which are different from each other;
- converging the first and second laser light beams onto a record face of an optical recording medium;
- and
- diffracting the first and second laser light beams reflected from the optical recording medium based on different diffraction order, such that the diffracted first and second laser light beams are received by the common light receiving element.
Dependencies are inferred from the claim text.