Illumination optical system and projection display optical...

Details Illumination optical system and projection display optical... Illumination optical system and projection display optical...

2006-04-04

2006-04-04

Perkey, W. B. (Department: 2851)

Optics: image projectors

Polarizer or interference filter

C353S038000, C348S751000, C348S766000, C349S009000, C349S096000

Reexamination Certificate

active

07021765

ABSTRACT:
An illumination optical system is disclosed, which provides a luminous flux with a small incident angle on an illumination surface in one axis direction on a section of the luminous flux. The illumination optical system can suppress a reduction in light amount by a mask provided for a polarization conversion element. The illumination optical system has a light source and an optical integrator. The optical integrator uses a lens array to perform splitting of a luminous flux from the light source. The illumination optical system has the polarization conversion element including a polarization beam splitter array, a plurality of ½ wave plates, and a mask. The light source is a discharge gas exciting arc tube of a DC drive type.

REFERENCES:
patent: 5589726 (1996-12-01), Gold
patent: 6260972 (2001-07-01), Robinson et al.
patent: 6412951 (2002-07-01), Sawai
patent: 11-64848 (1999-03-01), None

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