Image display apparatus

Details Image display apparatus Image display apparatus

2006-08-22

2006-08-22

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With light limiting or controlling means

C359S242000, C359S290000, C355S071000

Reexamination Certificate

active

07095568

ABSTRACT:
An image display apparatus includes a diaphragm (9b) arranged at a pupil position. The shape of an aperture of the diaphragm (9b) is similar to the shape of a light source image formed by an illuminating optical system at the pupil position. An area varying mechanism (90) varies the area of the aperture of the diaphragm (9b) in response to a focal length varying operation of a projection lens (9). This prevents an excessive opening from being formed around a light source image cast by the illuminating optical system, thereby preventing the deterioration of displayed images due to unwanted light that may pass through the excessive opening.

REFERENCES:
patent: 2005/0036216 (2005-02-01), Lee
patent: 05-303085 (1993-11-01), None
patent: 09-274253 (1997-10-01), None
patent: 11-281923 (1999-10-01), None

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