Holographic disk medium with servo marks

摘要

The present invention relates to a holographic disk medium ( 1 ) with servo marks ( 7 ), and more specifically to a holographic disk medium ( 1 ) having a common reflective layer ( 3 ) for reflecting a servo beam ( 9 ) and object and reference beams ( 8 ). According to the invention, a holographic disk medium ( 1 ) with a recording layer ( 2 ) for recording holograms ( 6 ) and a reflective layer ( 3 ) for reflecting a servo beam ( 9 ) and object and reference beams ( 8 ), includes servo marks ( 7 ) which are located in the reflective layer ( 3 ) at least partly below the holograms ( 6 ), wherein the servo marks ( 7 ) are designed such that their influence on the object and reference beams ( 8 ) is minimized.