Optical: systems and elements – Lens – With light limiting or controlling means
Reexamination Certificate
2007-07-03
2007-07-03
Sugarman, Scott J. (Department: 2873)
Optical: systems and elements
Lens
With light limiting or controlling means
C359S238000, C359S291000, C355S071000
Reexamination Certificate
active
11477900
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: 7095568 (2006-08-01), Kobayashi et al.
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
Aizaki Takatsugu
Kobayashi Manabu
Suzuki Tetsuji
Takahashi Ryusaku
Collins Darryl J.
Meyer Jerald L.
Protigal Stanley N.
Sugarman Scott J.
The Nath Law Group
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