Compact apparatus for reading from and/or writing to...

Details Compact apparatus for reading from and/or writing to... Compact apparatus for reading from and/or writing to...

2007-09-20

2010-12-28

Lavarias, Amel C (Department: 2872)

Optical: systems and elements

Polarization without modulation

Polarization by birefringence

C359S506000, C359S253000, C359S035000, C349S193000

Reexamination Certificate

active

07859751

ABSTRACT:
A compact apparatus for reading from and/or writing to holographic storage media and polarizing filter for use in such an apparatus includes a substrate with an outer zone and an inner zone, the outer zone and the inner zone having different optical properties for a first direction of polarization and a second direction of polarization, and a wave plate attached to the substrate for influencing the polarization of the a light beam, wherein a part of the wave plate corresponding to either the outer zone or the inner zone is switchable.

REFERENCES:
patent: 6111842 (2000-08-01), Nishino
patent: 6137764 (2000-10-01), Tsuchiya
patent: 6191829 (2001-02-01), Hashimoto
patent: 7010211 (2006-03-01), Cohen
patent: 1551011 (2005-07-01), None
Search Report Dated Apr. 3, 2007.

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