Patent ID: 7502151
Filing Date: 2009-03-10
Classification: G11B

Abstract:
1. A holographic recording and reconstructing apparatus, comprising: a light source having a variable oscillation wavelength; temperature sensing means for sensing temperature; and control means for controlling (1) recording onto a holographic recording medium a recording temperature which is sensed by the temperature sensing means, the recording temperature being sensed during recording of data onto the medium, (2) obtaining from the holographic recording medium the recording temperature, the recording temperature being obtained during reconstruction of the data recorded onto the medium, (3) obtaining a reconstruction temperature which is sensed by the temperature sensing means during reconstruction, (4) determining an amount of wavelength shift necessary to counteract the effects of a change in a dimension of the holographic recording medium which occurs between the time at which the recording temperature is sensed and the time at which the reconstruction temperature is sensed, the amount being determined based on the difference between the recording temperature and the reconstruction temperature, and (5) shifting the oscillation wavelength of the light source by the determined amount.