Polarization conversion element and optical system...

Details Polarization conversion element and optical system... Polarization conversion element and optical system...

2006-10-31

2006-10-31

Lavarias, Arnel C. (Department: 2872)

Optical: systems and elements

Extended spacing structure for optical elements

Extension of tubular element adjustable

C359S352000, C359S490020, C353S020000

Reexamination Certificate

active

07130123

ABSTRACT:
A polarization conversion element with four phase plates laminated on a substrate plate, in the order of first, second, third and fourth phase plates from a light incident side. The first and fourth phase plates have substantially same retardation values, while the second and third phase plate have substantially same retardation values. Ratio of the retardation value of the first phase plate to the retardation value of the second phase plate is in the range of 1:1 to 1:3. Relative to optical axis of the first phase plate, the second to fourth phase plates are set at the angles of 45 degrees, 90 degrees and 45 degrees, respectively.

REFERENCES:
patent: 5231521 (1993-07-01), Johnson et al.
patent: 5469279 (1995-11-01), Sharp et al.
patent: 6384956 (2002-05-01), Shieh

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