Patent ID: 8213276

Claim:
A recording apparatus to perform information recording using formation of marks by focusing a first light with an objective lens at a given position in a recording layer included in an optical disc recording medium, the recording apparatus comprising: a rotation driving unit to rotate the optical disc recording medium; a focus servo control unit to condense a second light which is different from the first light via the objective lens on a reflection film provided with a position guiding element in the optical disc recording medium, and to control a position of the objective lens so that the second light is focused on the reflection film at least in part on the basis of the reflected light of the second light condensed on the reflection film; a recording position setting unit to set an information recording position of the first light in a focus direction by changing a collimation of the first light incident on the objective lens; a tracking servo control unit to control a position of the objective lens to allow a focal position of the second light to follow the position guiding element at least in part on the basis of the reflected light of the second light; an eccentricity amount estimating unit, coupled to the optical disc recording medium, to estimate an eccentricity amount of the optical disc recording medium; and an eccentricity estimation amount acquisition control unit, coupled to the eccentricity amount estimating unit and rotation driving unit, to acquire an eccentricity estimation amount for each rotation angle within one revolution of the disc by rotating the optical disc recording medium and performing an operation of estimating the eccentricity amount using the eccentricity amount estimating unit.