发明申请
US20050231774A1 Method and apparatus for recording hologram, method and apparatus for reproducing hologram, and information retaining body 有权
用于记录全息图的方法和装置,用于再现全息图的方法和装置以及信息保持体

Method and apparatus for recording hologram, method and apparatus for reproducing hologram, and information retaining body
摘要:
While Fourier transformation of a signal light beam is performed to perform recording during holographic recording so that a focal point is formed outside a holographic recording layer (defocus recording), an aperture is arranged on an outgoing side of the reproduced signal light beam (reproduction light beam), the reproduction light beam is focused at the aperture, and low-order components of a Fourier transform image of the reproduction light beam are selectively transmitted to detect only the transmitted light beam. Therefore, information recorded as the hologram in the holographic recording layer can be reproduced with high S/N ratio from the holographic recording layer added onto a support body, particularly onto a sheet member having non-optical quality such as paper and a plastic card.
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