Patent ID: 8189252
Filing Date: 2012-05-29
Classification: G02B,G03H,G11B

Abstract:
1. A hologram device for recording or reproducing information to/from a hologram recording medium in which an optical interference pattern of reference light and signal light is held as a diffraction grating, comprising: a light forming section for splitting coherence light to form reference light and signal light modulated according to information to be recorded; an interfering section for mutually spatially separating an optical path of the reference light and an optical path of the signal light to allowing both the optical paths to intersect each other; a supporting portion for detachably supporting the hologram recording medium to an intersection point of the optical paths of the reference light and the signal light; and an image detecting section for receiving light diffracted from the diffraction grating of the hologram recording medium caused by an irradiated reference light thereto; wherein the interfering section includes a light deflecting device for irradiating the reference light to the hologram recording medium, wherein the light deflecting device includes a driving circuit electrically connected to the input and output side photodetectors and the fine motion light deflecting device to control a voltage which is applied to the fine motion light deflecting device on the basis of the light input side signal and the light output side signal, thereby changing the second deflection angle in a stair manner, wherein the driving circuit selects the angle direction of the reference light beam according to the information recorded or reproduced to/from the hologram recording medium.