Patent ID: 8279527

Claim:
A wide-angle projection optical system, from an object side to an image side, said wide-angle projection optical system comprising: a first lens set comprising one or more lenses, having positive power, and converging a light beam coming from said object side; an aperture stop; a second lens set comprising one or more lenses, having positive power, arranged behind said aperture stop, and configured to converge said light beam; a third lens set with negative power, and configured to diverge said light to enlarge a full field angle, wherein said third lens set comprises at least three meniscus lenses, the most image side lens being convex to the image at an optical axis, and both surfaces of each of at least two lenses of said third lens set are aspheric; a negative power reflecting minor closer to said image side than said first lens set, said second lens set and said third lens set, and configured to further enlarge said full field angle and correct image distortion; and a micro display, wherein said first lens set, said second lens set, said third lens set and said reflecting minor have a common substantially collinear optical axis, and said optical axis is shifted with respect to a center of said micro display.