Patent ID: 6097892
Filing Date: 2000-08-01
Classification: G03B

Abstract:
A viewfinder system comprising:an eyepiece lens having at least one aspheric surface; andvisual line detecting means including:illuminating means for illuminating an eyeball of a viewer;a visual line lens arranged to form an eyeball image by using light reflected from the eyeball of the viewer, said visual line lens having at least one aspheric surface;detection means on which the eyeball image is formed, said visual line detecting means detecting a visual line of the viewer by using information outputted from said detection means; andeach of said eyepiece lens and said visual line lens is composed of a single lens, wherein said eyepiece lens is composed of a single lens, said viewfinder system satisfying the following conditions:-2.5<R1/R2<-0.5R1<40 mmwhere R1 and R2 are radii of curvature of respective lens surfaces of said eyepiece lens in order from the side of the viewer.