Optical medium reproducing apparatus and optical medium reproducing method
AssigneeSony Corporation
InventorsKenji YAMAMOTO, Takashi NAKAO, Kimihiro SAITO
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Abstract
An optical medium reproducing apparatus that optically reproduces an optical medium on which a plurality of tracks is formed in which a beam returning from the optical medium is divided into a first region of an outside portion and a second region of an inside region, according to the shape of the pupil of an object lens, and crosstalk between the tracks is reduced by using a first detection signal of the first region and a second detection signal of the second region.
Claims16
An optical medium reproducing apparatus that optically reproduces an optical medium on which a plurality of tracks is formed, wherein:
- a single beam having a beam diameter and returning from the optical medium is divided into a first region and a second region,
- a shape of the beam is formed according to a shape of a pupil of an object lens,
- the second region corresponds to a center portion of the beam diameter, and the first region corresponds to a portion of the beam diameter outside the center portion, and
- crosstalk between the tracks is reduced using only information from the single beam by using a first detection signal of the first region and a second detection signal of the second region.
An optical medium reproducing method that optically reproduces an optical medium on which a plurality of tracks is formed, the method comprising:
- dividing a single beam having a beam diameter and returning from the optical medium into a first region and a second region and
- reducing crosstalk between the tracks using only information from the single beam by using a first detection signal of the first region and a second detection signal of the second region, wherein:
- a shape of the beam is formed according to a shape of a pupil of an object lens, and
- the second region corresponds to a center portion of the beam diameter, and the first region corresponds to a portion of the beam diameter outside the center portion.
Dependencies are inferred from the claim text.