HOLOGRAM DEVICE AND HOLOGRAM RECORDING APPARATUS

PROBLEM TO BE SOLVED: To provide a collinear hologram device and a hologram recording apparatus where the magnification of reproduction light reaching a photosensor 26 can be adjusted without indicating positioning in the region of reproduced signal light. SOLUTION: Reproduction light includes: a reproduction signal light which changes in accordance with the recording data of a hologram recording medium 16; and reference light which is present at the outside of the reproduction signal light in the cross section of a light path and does not change in accordance with the recording data of the hologram recording medium 16. In the reference light, patterns A, B are formed, and, based on a difference between the intervals of the patterns A, B in the image data and the proper intervals of the patterns A, B, a detection lens 24 is adjusted. COPYRIGHT: (C)2008,JPO&INPIT