Projection optical unit and projection image display apparatus

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

2007-01-09

2007-01-09

Perkey, W. B. (Department: 2851)

Optics: image projectors

Distortion compensation

C353S097000, C353S101000, C353S030000, C353S076000, C359S432000, C359S434000, C359S684000, C359S685000, C359S694000, C359S721000, C359S754000, C359S794000

Reexamination Certificate

active

10921938

ABSTRACT:
A projection optical unit has two lens groups. A first projection optical unit disposed closest to an image display element, temporarily forms a first enlarged image (magnification: M1) at the image display element side, rather than at a second projection optical unit. The first enlarged image is subsequently projected in an enlarged form (magnification: M2, wherein M2>M1) onto a screen via the second projection optical unit. A field lens group having positive refractive power is disposed between the first projection optical unit and the second projection optical unit. Consequently, the relationship between F2, which is the F-value of the second projection optical unit, and F1, which is the F-value of the first projection optical unit, becomes F2=F1/M1, whereby it is possible to realize very-wide-angle imaging at a field angle exceeding 90 degrees.

REFERENCES:
patent: 4924244 (1990-05-01), Kataoka et al.
patent: 5048939 (1991-09-01), Yatsu et al.
patent: 5648871 (1997-07-01), Okuyama et al.
patent: 5986806 (1999-11-01), Sugawara
patent: 6975460 (2005-12-01), Ikeda et al.
patent: 5-134213 (1993-05-01), None
patent: 6-194598 (1994-07-01), None
patent: 11-326759 (1999-11-01), None
patent: 2000-162544 (2000-06-01), None
patent: 2002-357768 (2002-12-01), None

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