Optics: image projectors – Polarizer or interference filter
Reexamination Certificate
2011-04-12
2011-04-12
Lee, John R (Department: 2878)
Optics: image projectors
Polarizer or interference filter
C353S031000, C353S034000, C359S490020, C359S490020, C359S506000, C359S634000
Reexamination Certificate
active
07922331
ABSTRACT:
A polarization conversion unit includes a polarization splitting element array including a plurality of polarization splitting films for splitting the incident light beam into two types of linearly-polarized light beams, a plurality of reflecting films for reflecting either one of the linearly-polarized light beams obtained by the polarization splitting films, and a translucent member provided with the polarization splitting films and the reflecting films, a plurality of retardation plates each formed of a quartz crystal member and for converting a polarization axis of either one of the linearly-polarized light beams obtained by the polarization splitting films into a polarization axis of the other of the linearly-polarized light beams, and a spacer member having a predetermined thickness and for bonding end sections of the retardation plates to a light beam exit side of the translucent member.
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AdvantEdge Law Group, LLC
Lee John R
Seiko Epson Corporation
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