| 摘要 |
The objective of the present invention is to achieve suitable recording and playback for a hologram recording medium. An hologram recording and playback device is provided with: a medium rotation unit which rotates a hologram recording medium around a predetermined rotational axis; a movement unit which is capable of moving the position of the medium rotation unit within a plane that is perpendicular to the rotational axis; an orthogonal incident angle modification unit which is capable of modifying an orthogonal incident angle, at which reference light incident to the hologram recording medium impinges therefrom, to a direction that is orthogonal to an incident surface that includes the optical axis of the signal light and the normal line of the hologram recording medium; a medium rotation control unit which controls the medium rotation unit so as to rotate the hologram recording medium; an eccentricity compensation unit which performs positioning control of the movement unit; an orthogonal incident angle control unit which controls the orthogonal incident angle modification unit; and an orthogonal incident angle calculation unit which calculates the orthogonal incident angle. When the medium rotation control unit controls the medium rotation unit so as to cause rotation of the hologram recording medium, the orthogonal incident angle control unit controls, subsequent to performing positioning control of the movement unit by the eccentricity compensation unit, the orthogonal incident angle modification unit so as to modify the orthogonal incident angle of the reference light on the basis of the calculation result of the orthogonal incident angle calculation unit. |
