Patent ID: 6809875
Filing Date: 2004-10-26
Classification: G02B

Abstract:
An eyepiece optical system comprising:a first lens unit; and a second lens unit, the first lens unit and the second lens unit being arranged in this order from an intermediate-image side toward a pupil side, wherein the first lens unit includes a negative lens, the negative lens being located at a position closest to an intermediate image, and the second lens unit includes a path-bending optical member and has positive power as a whole, satisfying the following condition: âˆ’201<0 where sf1 is a shaping factor of the negative lens and is expressed as (r11+r12)/(r11âˆ’r12), where r11 is a radius of curvature of an intermediate-image-side surface of the negative lens and r12 is a radius of curvature of a pupil-side surface of the negative lens.