Projection optical system and image projection apparatus

Details Projection optical system and image projection apparatus Projection optical system and image projection apparatus

2005-04-19

2005-04-19

Nguyen, Judy (Department: 2851)

Optics: image projectors

Lens support

Lens position adjustable

C353S100000, C353S069000, C359S557000, C359S649000

Reexamination Certificate

active

06880937

ABSTRACT:
In a projection optical system projecting an image displayed on a predetermined play surface onto a predetermined projection surface, two decentering lens units movable in directions vertical to the optical axis and substantially vertical to each other are included between a rear lens unit situated on the display surface side and a front lens unit situated on the projection surface side, a driving mechanism is provided that reciprocates the two decentering lens units in the directions vertical to the optical axis. When the focal lengths of the two decentering lens units are FD1and FD2, respectively, and the focal length of the rear lens unit is FR, the relationships 0.01≦|FR/FD1|≦0.2 and 0.01≦|FR/FD2|≦0.2 are satisfied.

REFERENCES:
patent: 5980045 (1999-11-01), Fujibayashi
patent: 6113240 (2000-09-01), Iizuka
patent: 20030007138 (2003-01-01), Shigematsu et al.

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