Projection optical system, image display apparatus, and...

Optical: systems and elements – Lens – With field curvature shaping

Reexamination Certificate

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C359S630000, C359S728000

Reexamination Certificate

active

06894842

ABSTRACT:
The invention discloses a projection optical system for projecting an original image onto a projection surface. The projection optical system comprises a plurality of aspherical curved mirrors, which reflects image light from the original image in sequence and then forms an image on the projection surface. The projection optical system forms a projected image on the projection surface at an aspect ratio different from that of the original image by a combination of reflective actions of the image light on the aspherical surfaces of the plurality of aspherical curved mirrors. Even in a projection optical system having a wide angle of view and a short distance of projection, it is possible to implement a projection optical system that is capable of suppressing distortion and performing an optical aspect conversion.

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English Abstract of JPH11-109243 (A).
English Abstract of JP2001-128038 (A).
English Abstract, Applicant's comments, partial translation into English and drawings of JPH04-097671 (A).

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