Holographic recording medium, holographic record erasing...

Optical: systems and elements – Holographic system or element – Having particular recording medium

Reexamination Certificate

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C359S035000, C430S001000

Reexamination Certificate

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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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patent: 5162927 (1992-11-01), Moss et al.
patent: 6322932 (2001-11-01), Colvin et al.
patent: 6483611 (2002-11-01), Mizutani et al.
patent: A-02-179673 (1990-07-01), None
patent: A-2001-006215 (2001-01-01), None

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