Holographic ROM system including an alignment apparatus for...

Details Holographic ROM system including an alignment apparatus for... Holographic ROM system including an alignment apparatus for...

2005-11-22

2005-11-22

Assaf, Fayez G. (Department: 2872)

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

C359S001000, C359S034000, C355S002000, C356S400000

Reexamination Certificate

active

06967755

ABSTRACT:
A holographic ROM system includes an alignment apparatus for aligning a holographic medium for storing data and a mask with patterns of the data. The alignment apparatus has a beam irradiating unit for irradiating a light beam to alignment marks of the holographic medium and the mask; an alignment mechanism for moving at least one of the holographic medium and the mask in response to a control signal; a photo detecting unit for detecting the beam passing through the alignment marks of the holographic medium and the mask while the holographic medium and/or the mask being moved; and a control unit for generating the control signal, the control unit controlling the alignment mechanism based on intensity of the beam detected by the photo detecting unit.

REFERENCES:
patent: 2004/0263815 (2004-12-01), Kim
patent: 2005/0018263 (2005-01-01), Pharris
patent: 2005/0036182 (2005-02-01), Curtis et al.

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