Patent ID: 6778324
Filing Date: 2004-08-17
Classification: G02B

Abstract:
A viewfinder optical system for facilitating a reduction in the size thereof without increasing at least one of the incidence of ghost images and decentering aberration, comprising:an objective lens unit; an image inverting unit for converting an inverted object image formed via said objective lens unit into a non-inverted erecting image; and an eyepiece lens unit for observing the non-inverted erecting image, wherein said image inverting unit comprises a first transparent body and a second transparent body which are disposed with an interval put therebetween, said second transparent body having only a function of transmitting a ray of light, wherein said image inverting unit restrains creation of at least one of ghost images and decentering aberration by making the interval between said first transparent body and said second transparent body not uniform, and wherein a surface of said first transparent body which most closely faces said second transparent body is a total-reflection surface.