Patent ID: 6980365
Filing Date: 2005-12-27
Classification: G02B

Abstract:
1. An optical system comprising: (A) a microdisplay; and (B) a magnifier for producing a magnified image of the microdisplay for viewing by a human eye, said magnifier having a focal length fo, a long conjugate side in the direction of the human eye, a short conjugate side in the direction of the microdisplay, and an f-number f# for light passing from the long conjugate to the short conjugate, said magnifier, in order from the long conjugate side to the short conjugate side, comprising: (I) a first element having a first surface which is convex in the direction of the long conjugate, said first element having a focal length f (II) a block of optical material; and (III) a second element having a second surface which is convex in the direction of the short conjugate, said second element having a focal length f wherein: