Projection apparatus

Details Projection apparatus Projection apparatus

2008-12-18

2011-11-22

Epps, Georgia Y (Department: 2878)

Optics: image projectors

Light shield, mask, hood, or diaphragm

C385S146000, C362S551000

Reexamination Certificate

active

08061855

ABSTRACT:
A projection apparatus including an image display element for modulating illumination light, an illumination optical system for irradiating the illumination light onto the image display element, a projection optical system for projecting the modulated light by the image display element onto a projection surface, and an optical system changing section for changing the illumination optical system, wherein the illumination optical system includes a light source, a condensing optical system, a rod integrator and an illumination relay optical system wherein the projection optical system includes a projection variable-aperture diaphragm whose aperture diameter can be adjusted, and wherein the optical system changing section changes, when the aperture diameter of the projection variable-aperture diaphragm is made smaller, the illumination optical system such that an amount of light passing through the projection variable-aperture diaphragm with that aperture diameter increases.

REFERENCES:
patent: 5519518 (1996-05-01), Watanabe et al.
patent: 5978051 (1999-11-01), Gohman et al.
patent: 6789931 (2004-09-01), Pinho
patent: 6868223 (2005-03-01), Shinoda
patent: 05-188345 (1993-07-01), None
patent: 11-176221 (1999-07-01), None
patent: 2003-100622 (2003-04-01), None
patent: 2009159163 (2009-07-01), None

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