Patent ID: 9581888
Date: 2017-02-28
CPC Classifications: G02B,G03B

Claim:
1. A projection apparatus, comprising: an image-producing element for producing at least one image; projection optics comprised of free-form areas for magnifying and reflecting the image toward an viewer for observation, wherein the projection optics comprises at least a first mirror and a second mirror, the image is reflected by the first mirror and the second mirror in succession, no deflection mirror is disposed between the viewer and the second mirror, and the first mirror and the second mirror are in the form of a non-rotationally symmetrical system; a field lens disposed between the image-producing element and the first mirror for transmitting the image; an aperture stop disposed between the field lens and the first mirror; a first lens group with refractive power disposed between the field lens and the aperture stop; and a second lens group with refractive power disposed between the aperture stop and the first mirror.