Patent ID: 7808687
Filing Date: 2010-10-05
Classification: G03H,G11B,G11C

Abstract:
1. A hologram reconstructing apparatus that irradiates reconstruction reference light to a hologram recording medium on which data is multiplexed, receives reconstruction light thus generated by the hologram recording medium by imaging means and demultiplexes and reconstructs the multiplexed data, the apparatus comprising: unnecessary light removing means for causing the imaging means to receive necessary light only included in the reconstruction light; driving means for operating the hologram recording medium or a reconstruction light optical system; light detecting means for detecting the state that reconstruction light is projected to the unnecessary light removing means of the light cut by the unnecessary light removing means; and control means for obtaining the displacement of the hologram recording medium based on the information on a specific part of the projection state information detected by the light detecting means and controlling the driving means to cancel the displacement and move the hologram recording medium or the optical system, wherein a or b is defined so as not to satisfy a=2nb where a is an interval between/among photoreceptors of the light detecting means, b is an interval of data recorded in multibook on the hologram recording medium, and n is a natural number.