Patent ID: 8279536
Filing Date: 2012-10-02
Classification: G02B

Abstract:
1. A fixed-focus lens capable of imaging a light valve disposed at a reduced side onto a magnified side comprising: a first lens group, disposed in the light path between the reduced side and the magnified side, a second lens group, disposed in the light path between the first lens group and the magnified side and comprising a first free form lens and an aspherical lens, the aspherical lens being disposed in the light path between the first lens group and the first free form lens, wherein the aspherical lens and the first free form lens both have negative refractive power, and a free form reflective mirror, disposed in the light path between the second lens group and the magnified side, wherein the free form reflective mirror is a convex mirror, and wherein an imaging surface imaged from the light valve by the fixed-focus lens in the magnified side is a curved surface.