Illumination optical system and image projection apparatus

Details Illumination optical system and image projection apparatus Illumination optical system and image projection apparatus

2006-10-06

2009-10-06

Dowling, William C (Department: 2851)

Optics: image projectors

Polarizer or interference filter

C353S081000, C349S005000

Reexamination Certificate

active

07597446

ABSTRACT:
An illumination optical system is disclosed which capable of uniformly illuminating a surface to be illuminated. The illumination optical system comprises a polarization conversion element which converts a luminous flux from a light source into a luminous flux having a certain polarization direction, a polarization beam splitter which splits the luminous flux from the polarization conversion element, and a phase plate which gives a phase difference to the luminous flux from the polarization beam splitter. The system illuminates the surface with the luminous flux from the phase plate and satisfies the conditions θx<θy and 0°<φy<θy. θx and θy represent the maximum incident angles onto the surface in the x and y directions, and φy represents an incident angle onto the phase plate at which the phase difference at a principal wavelength of the luminous flux that passes through the phase plate is 90 degrees.

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