Projection optical device

Details Projection optical device Projection optical device

1996-06-21

1998-10-13

Dowling, William

Optics: image projectors

Distortion compensation

For projection axis inclined to screen

353101, G03B 2114

Patent

active

058202404

ABSTRACT:
A projection optical device includes a projection optical system for projecting an image of an object plane onto a screen without forming an intermediate real image. The projection optical system includes a coaxial first lens group to be arranged relatively near the object plane, a coaxial second lens group to be arranged relatively near the screen, and a stop arranged between the first and second lens groups. The second lens group has an optical axis inclined with respect to an optical axis of the first lens group. A magnification .beta.1 of the first lens group satisfies a relationship of .vertline.1/.beta.1.vertline.<0.05. The second lens group is angularly deviated from the first lens group around a position of the stop.

REFERENCES:
patent: 4089599 (1978-05-01), Kuboshima
patent: 5032022 (1991-07-01), Sato et al.
patent: 5096288 (1992-03-01), Yano et al.
patent: 5220363 (1993-06-01), Sato et al.
patent: 5302983 (1994-04-01), Sato et al.
patent: 5422691 (1995-06-01), Ninomiya et al.
patent: 5442413 (1995-08-01), Tejima et al.

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