Optical disk apparatus
AssigneeFunai Electric Co., Ltd.
InventorTadashi Tachibana
Life of this patent
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Abstract
In an optical disc apparatus of the three-beam type, recording and/or reproduction are performed on an optical disc by: irradiating a groove with a main beam; irradiating a first land where address information of the groove is recorded, in front of the main beam with a first side beam; and irradiating a second land where address information adjacent to the groove is recorded, in rear of the main beam with a second side beam. The optical disc apparatus has: an LLP extracting section 18 which extracts an LLP signal from reflected light of the first side beam that irradiates the first land in front of the main beam; and an MPU 20 which calculates the address information on the basis of the extracted LLP signal, thereby pre-reading the address information.
Claims5
An optical disc apparatus of a three-beam type in which performs at least one of recoding information on an optical disc and reproducing the information recorded on the optical disc by:
- irradiating a main beam on a groove formed on the optical disc;
- irradiating a first side beam on a first land in which address information of the groove is recorded and formed adjacent to the groove, at a position in front of the main beam;
- irradiating a second side beam on a second land in which address information of a groove adjacent to the groove is recorded and formed opposite to the first land, at a position in rear of the main beam, the apparatus comprising:
- a unit configured to extract an LLP signal from reflected light of the first side beam, and to calculate the address information on the basis of the LLP signal, thereby pre-reading the address information.
An optical disc apparatus of a three-beam type in which performs at least one of recoding information on an optical disc and reproducing the information recorded on the optical disc by:
- irradiating a main beam on a groove formed on the optical disc;
- irradiating a first side beam on a first land in which address information of the groove is recorded and formed adjacent to the groove;
- irradiating a second side beam on a second land in which address information of a groove adjacent to the groove is recorded and formed opposite to the first land, the apparatus comprising:
- a LLP extracting unit configured to extract an LLP signal from reflected light of the first side beam;
- and
- an address calculating unit configured to calculate the address information on the basis of the LLP signal.
An optical disc apparatus of a three-beam type in which performs at least one of recoding information on an optical disc and reproducing the information recorded on the optical disc, the apparatus comprising:
- a first irradiating unit configured to irradiate a main beam on a groove formed on the optical disc;
- a second irradiating unit configured to irradiate a first side beam on a first land in which address information of the groove is recorded and formed adjacent to the groove;
- a third irradiating unit configured to irradiate a second side beam on a second land in which address information of a groove adjacent to the groove is recorded and formed opposite to the first land;
- an extracting unit configured to extract an LLP signal from reflected light of the first side beam;
- and
- a control unit configured to calculate the address information on the basis of the LLP signal.
Dependencies are inferred from the claim text.