Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2007-06-26
2007-06-26
Korzuch, William (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S112010
Reexamination Certificate
active
10702446
ABSTRACT:
A holographic recording/reproducing apparatus includes a splitter unit for splitting a laser beam into a first laser beam for generating a signal beam and a second laser beam which serves as a reference beam, a spatial light modulator for spatially modulating the first laser beam in accordance with information to be recorded, the modulated first laser beam serving as the signal beam, and a first lens system for focusing the signal beam and the reference beam onto a holographic recording medium. In a recording process, the signal beam and the reference beam are guided through one and the other half-regions separated along the optical axis of the first lens system. In a reproduction process, only the reference beam is guided through one of the half-regions and a signal reproduction beam from the holographic recording medium is guided through a second lens system in the other half-region.
REFERENCES:
patent: 5917798 (1999-06-01), Horimai et al.
patent: 6256281 (2001-07-01), Tanaka et al.
patent: 6490061 (2002-12-01), Tanaka et al.
patent: 2002/0154589 (2002-10-01), Tanaka et al.
Ishioka Koji
Kobayashi Shigeo
Sugiki Mikio
Takahashi Kazuo
Tanaka Tomiji
Goma Tawfik
Korzuch William
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