Patent ID: 8786960

Claim:
A projection apparatus used to project an image on a projection screen, and the projection apparatus comprising: an image generation device generating a light with the image, the image generation device having a light valve, and the light being emitted from the light valve; and a projection lens, having no mirror, and the projection lens comprising: a first lens group, having an optical axis and a first effective refractive index, and the first lens group comprising a plurality of first lenses, wherein the first lenses comprises two first aspherical lenses; and a second lens group, having a second effective refractive index, and the second lens group being disposed between the first lens group and the light valve and along the optical axis; wherein the light generated from the light valve penetrates through the second lens group and forms an intermediate image between the first lens group and the second lens group, and the intermediate image penetrates through the first lens group to form a projection image on the projection screen, and the light is projected onto the projection screen only through the projection lens; wherein a center of the projection image and a center of the light valve are disposed at a first side of the optical axis, a center of the intermediate image is disposed at a second side of the optical axis, and the second side is different from the first side.