Patent ID: 6853356

Claim:
An optical system for directing a beam from display means to a predetermined position, wherein a ray emerging from the center of the display surface of said display means and passing through the center of the exit pupil of said optical system is defined as a central field angle principal ray, said optical system comprising: a first optical element having a plurality of eccentric reflecting surfaces, each of the eccentric reflecting surfaces having power and being eccentric relative to the central field angle principal ray, and an eccentric mirror system comprising at least one eccentric mirror having positive power and eccentric relative to the central field angle principal ray, wherein the beam from said display means is condensed and directed to said first optical element by said eccentric mirror system; and wherein said optical system has refractive power capable of forming an intermediate image in an optical path leading from the display means to the predetermined position; wherein the central field angle principal ray does not intersect on the optical path in said eccentric mirror system; and further comprising at least two surfaces, each of which has power, respectively disposed in the optical path before the intermediate image is formed and between the intermediate image and the exit pupil of said optical system.