Polarization conversion device, polarized illumination...

Details Polarization conversion device, polarized illumination... Polarization conversion device, polarized illumination...

2010-02-18

2011-10-11

Doan, Jennifer (Department: 2874)

Liquid crystal cells, elements and systems

Liquid crystal system

Projector including liquid crystal cell

C349S001000, C349S005000, C349S008000, C349S056000, C349S057000

Reexamination Certificate

active

08035759

ABSTRACT:
Polarizing split layers26and reflection layers27are provided on bonding surfaces between prism rods24aand24b. Polarization conversion devices25are bonded to an emission surface from which linearly polarized light being reflected by the polarizing split layers26and reflected by the reflection layer27are emitted. The polarization conversion devices25are formed by bonding plural prism rods30with side surfaces being inclined by 45° with respect to an incidence surface. Retardation films formed of dielectric multilayers are provided between the bonding surfaces to give a phase difference of a ½wavelength to transmitted light. The retardation films and bonding borderlines31are inclined by 45° within a plane perpendicular to an optical axis of linearly polarized light so that an optical axis of the retardation film has an angle of 45° with respect to a polarization direction of the linearly polarized light.

REFERENCES:
patent: 6429975 (2002-08-01), Sawai et al.
patent: 7046422 (2006-05-01), Kimura et al.
patent: 7520617 (2009-04-01), Kobayashi
patent: 2006-064871 (2006-03-01), None
patent: 2008-129190 (2008-06-01), None

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