Projector and polarization member used in projector

Details Projector and polarization member used in projector Projector and polarization member used in projector

2005-09-27

2008-08-05

Dowling, William C. (Department: 2851)

Optics: image projectors

Polarizer or interference filter

C353S081000, C359S490020

Reexamination Certificate

active

07407292

ABSTRACT:
Aspects of the invention can provide a polarization member that can include a reflection type polarization element that transmits, of an incident light, a linear polarization component in a specific direction and reflects components other than the linear polarization component in the specific direction, and a return light splitting prism having a light incident surface on which the incident light goes incident, a light exiting surface disposed at a specific tilting angle with respect to the light incident surface, and a light discharge surface from which a return light that is reflected on the reflection type polarization element provided to the light exiting surface and enters inside by way of the light exiting surface, can be discharged in a direction that crosses neither an optical path of the incident light that goes incident on the light incident surface nor an optical path of a light that has passed through the reflection type polarization element. The light discharge surface can include a light transmission region surface, on which, of return lights entering inside by way of the light exiting surface, lights that have been reflected different numbers of times on one of the light incident surface and the light reflection type polarization element or on both, go incident at almost a same angle of incidence in opposite tilting directions to pass through.

REFERENCES:
patent: 6592224 (2003-07-01), Ito et al.
patent: WO 01/055778 (2001-08-01), None

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