Patent ID: 6021002
Filing Date: 2000-02-01
Classification: G02B

Abstract:
A real-image finder, comprising,an objective optical system which forms an image of an object to be viewed;a field frame member located on a primary image forming plane on which said image formed by said objective optical system is formed;an ocular optical system through which said object image formed on said primary image forming plane is viewed;an image erecting optical system which erects said object image formed by said objective optical system;wherein transparent members are cemented directly on the front and rear surfaces of said field frame member, and the thicknesses of said transparent members are determined so that if a foreign matter sticks to the end surfaces of said transparent members that are opposite to and located away from said field frame member, no foreign matter can be viewed through said ocular optical system; andwherein said field frame member and said transparent members form a cemented optical element, and said cemented optical element is constructed independently from said image erecting optical system.