Patent ID: 7821722

Claim:
A wide-angle projection lens used in a projection apparatus, wherein from an image side of the projection apparatus, the wide-angle projection lens comprises: a first lens group having an imaging optical axis, a negative effective refractive power and at least one aspheric lens surface; a second lens group having a first positive effective refractive power; a third lens group having a second positive effective refractive power; and an aperture stop disposed in the third lens group; wherein an effective focal length of the combination of the first lens group, the second lens group and the third lens group is fw, 6.5 mm<fw<9.5 mm, a light projected from a light-source side of the projection apparatus to the wide-angle projection lens generates an image to the image side of the projection apparatus, and a center of the light and a center of the image are located at different sides of the imaging optical axis.