Optics: image projectors – Polarizer or interference filter
Reexamination Certificate
2011-07-12
2011-07-12
Le, Que T (Department: 2878)
Optics: image projectors
Polarizer or interference filter
C353S022000, C353S030000
Reexamination Certificate
active
07976166
ABSTRACT:
An optical system for image projection is disclosed which is capable of improving contrast while suppressing reduction of light amount. The optical system includes a converging optical system, and a polarization beam splitting surface transmitting an incoming light flux having a first polarization direction from the converging optical system, to introduce it to the image-forming element and causing light having a second polarization direction, of an outgoing light flux from the image-forming element, to proceed to a projection optical system. In a first cross-section parallel to a normal to the polarization beam splitting surface, the converging optical system has a configuration causing an incident angle on the splitting surface of a light ray passing through a barycenter of intensity distribution of the outgoing light flux to be larger than an incident angle thereon of a light ray passing through a barycenter of intensity distribution of the incoming light flux.
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Chinese Patent Office Notification of First Office Action concerning Appln 200710110224.8 dated Aug. 1, 2008 and partial translation.
Kadowaki Ryota
Okuyama Atsushi
Sudo Takashi
Yamauchi Yu
Bui-Pho Pascal M
Canon Kabushiki Kaisha
Le Que T
Rossi Kimms & McDowell LLP
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