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US 8,014,256 B2Granted
Optical pickup and information device
AssigneePioneer Corporation
InventorsNaoharu Yanagawa, Masataka Izawa
Life of this patent
Estimating the term…
Abstract
An optical pickup for irradiating an information recording medium, such as a DVD, with a laser beam when an information signal is recorded or reproduced, and information equipment provided with the optical pickup.
Claims13
An optical pickup for recording or reproducing an information signal with respect to an optical disc comprising a plurality of recording layers, each recording layer having a recording track in which information pits are arranged, the information signal being recorded in the information pits, said optical pickup comprising:
- a light source for irradiating a laser beam;
- a diffracting device for diffracting the irradiated laser beam to zero-order light and diffraction light;
- an optical system for guiding the zero-order light and the diffraction light, which are diffracted, to one recording layer of the plurality of recording layers;
- an optical functional element for differentiating a phase difference of polarization of the zero-order light and a phase difference of polarization of the diffraction light;
- one or a plurality of light receiving devices for receiving at least the diffraction light;
- and
- an optical path branching device for guiding the zero-order light and the diffraction light coming from the one recording layer, to said light receiving device.
4 more elements
An information equipment comprising:
- an optical pickup;
- and
- a recording/reproducing device for irradiating an optical disc with a laser beam, to thereby record or reproduce an information signal, wherein
- said optical pickup is for recording or reproducing the information signal with respect to the optical disc comprising a plurality of recording layers, each recording layer having a recording track in which information pits are arranged, the information signal being recorded in the information pits, said optical pickup is comprising:
- a light source for irradiating a laser beam;
- a diffracting device for diffracting the irradiated laser beam to zero-order light and diffraction light;
- an optical system for guiding the zero-order light and the diffraction light, which are diffracted, to one recording layer of the plurality of recording layers;
- an optical functional element for differentiating a phase difference of polarization of the zero-order light and a phase difference of polarization of the diffraction light;
- one or a plurality of light receiving devices for receiving at least the diffraction light;
- and
- an optical path branching device for guiding the zero-order light and the diffraction light coming from the one recording layer, to said light receiving device.
8 more elements
Dependencies are inferred from the claim text.