| 摘要 |
<p>An objective of the present invention is to implement suitable record/play with respect to a holographic recording medium. Provided is an optical information record/play device whereby recording and/or play of information upon an optical informaiton recording medium is carried out, said device comprising: a light detector which detects a two-dimensional play image which is obtained from the optical information recording medium; a medium rotation unit which rotates the optical information recording medium; an in-plane movement unit, further comprising a movable part which is capable of moving in a plane which is approximately parallel to the optical information recording medium; eccentricity detection units which, using a mark for eccentricity detection which is disposed upon the optical information recording medium, detect the location of the optical information recording medium for each movable axle of the in-plane movement unit; an eccentricity compensation unit which controls the in-plane movement unit on the basis of output signals of the eccentricity detection units; and an offset addition unit which adds, to the output signals of the eccentricity detection units, an offset quantity which is derived on the basis of the information of the two-dimensional play image which the light detector has detected.</p> |
