Patent ID: 9607648
Date: 2017-03-28
CPC Classifications: G11B

Claim:
1. A recording/reproducing apparatus for recording or reproducing information by irradiating light onto a recording medium, comprising: a medium rotation unit for rotating the recording medium; a displacement stage having a movable portion that moves along at least two driving axes in a predetermined plane, and the medium rotation unit is fixed onto the movable portion; a rotational-angle detection unit for detecting a rotational angle of the recording medium by using an angle-detection-dedicated mark disposed on the recording medium; a position detection unit for detecting a position of the recording medium by detecting an edge of an inner-circumference side or an outer-circumference side of an eccentricity-detection-dedicated mark provided on the recording medium; and a transportation unit on which the displacement stage, the rotational-angle detection unit and the position detection unit are fixed, wherein the movable portion moves in the predetermined plane relative to the transportation unit, and the predetermined plane is substantially parallel to a recording surface of the recording medium.