HOLOGRAM INFORMATION REPRODUCING DEVICE

摘要

[PROBLEMS] A hologram information reproducing device capable of reproducing information from a hologram information-recorded recording medium and being downsized. [MEANS FOR SOLVING PROBLEMS] When output from a light source (11), light beams are changed into parallel light beams by the lens (121) of an optical system (12). These parallel light beams A have their directions changed to obliquely lower directions by a mirror (122) to be directed toward a recording medium M. Specifically, when viewed from above, light beams from the light source (11) have light paths changed about 90æ by the mirror (122), and, when viewed from side, light beams from the light source (11) have light paths changed about 45æ downward by the mirror (122). Since an interference fringe (25) recorded on a recording medium M is in the form of Bragg grating, reproduced light beams B are obtained by Bragg diffraction when the light beams A are applied to the recording area (24) of the recording medium M. Reproduced light beams B are reflected off the reflection layer (23) of the recording medium M to be detected by a photodetector (13).