Optical: systems and elements – Holographic system or element – Having particular recording medium
Reexamination Certificate
2004-11-29
2009-06-02
Chang, Audrey Y (Department: 2872)
Optical: systems and elements
Holographic system or element
Having particular recording medium
C359S035000, C430S001000
Reexamination Certificate
active
07542185
ABSTRACT:
A holographic record erasing method and a holographic recording and reproducing apparatus in which data reproduction can be disabled without irradiating a holographic recording medium with a high energy erasing beam or physically destroying the medium. A holographic recording medium16in a holographic recording and reproducing apparatus10has a recording layer17formed of two split recording layers17A and17B, and a crosstalk layer17C is provided therebetween. The crosstalk17C layer still has photosensitivity after completion of multiplex recording of data holograms24in the recording layer17. An object beam IOb for erasing and a reference beam IRe for erasing each having a large beam diameter are projected onto the layer to form a crosstalk hologram26having low selectivity. Hence, when a reproduction beam is projected onto the data holograms24, a diffraction beam is always generated also from the crosstalk hologram26.
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Miura Hideaki
Mizushima Tetsuro
Tsukagoshi Takuya
Yoshinari Jiro
Chang Audrey Y
Oliff & Berridg,e PLC
TDK Corporation
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