Projection image display apparatus and projection optical...

Details Projection image display apparatus and projection optical... Projection image display apparatus and projection optical...

2005-08-08

2009-06-30

Blackman, Rochelle-Ann J (Department: 2862)

Optics: image projectors

Distortion compensation

For projection axis inclined to screen

C353S077000, C353S098000, C359S859000, C348S746000, C348S756000

Reexamination Certificate

active

07553031

ABSTRACT:
In a projection type image display apparatus, for enlarging an image on a image display apparatus1by means of a projection lens2, thereby projecting the enlarged image onto a screen6, obliquely, being inclined thereto, between the projection lens2and a rear-surface mirror5, there are disposed free shaped surface mirrors3and4, each having a free shaped surface for compensating a trapezoidal distortion due to oblique projection of the enlarged image. The surface configuration of the free shaped surface mirror is so shaped as to satisfy a following equation:in-line-formulae description="In-line Formulae" end="lead"?|L1−L2|>1.4·Dvin-line-formulae description="In-line Formulae" end="tail"?if assuming that a distance for a light beam of an upper end of the enlarged image to reach the screen after being reflected upon a free shaped surface is “L1”, a distance for a light beam of a lower end of the enlarged image to reach the screen after being reflected upon the free shaped surface is “L2”, and a distance from an upper end of an image on the screen to a lower end thereof is “Dv”.

REFERENCES:
patent: 6951395 (2005-10-01), Chatani et al.
patent: 2003/0206353 (2003-11-01), Ishihara
patent: 2004/0027544 (2004-02-01), Chatani et al.
patent: 5-134213 (1993-05-01), None
patent: 2000-162544 (2000-06-01), None
patent: 2002-357766 (2002-12-01), None
patent: 2003-161885 (2003-06-01), None
patent: 2003-287682 (2003-10-01), None
Patent Office of the People's Republic of China (SIPO) office action for SIPO application CN2005-100877796 Jan. 26, 2007.

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