Patent ID: 6018417
Filing Date: 2000-01-25
Classification: G02B

Abstract:
A real image finder, comprising:a single objective optical system, which forms a real image of an object;a first erecting optical system which erects an object image formed by said objective optical system;a first eyepiece optical system, an image erected by said first erecting optical system being observed through said first eyepiece optical system;a branch plane which directs a luminous flux from said objective optical system to proceed along either a first optical path, which directs said luminous flux to said first eyepiece optical system, or a second optical path which is different from said first optical path, said branch plane being one of a plurality of reflection surfaces included in said first erecting optical system;a second erecting optical system which is arranged on said second optical path for erecting an object image formed by said objective optical system; anda second eyepiece optical system, which is used for observing an image erected by said second erecting optical system;wherein said first erecting optical system includes a pentaprism and a Dach prism, and wherein said second erecting optical system includes a Dach type reflection surface.