Patent ID: 6388738
Filing Date: 2002-05-14
Classification: G02B,G03B

Abstract:
A rangefinder optical system comprising a first optical system through which a first image is viewed; a field frame optical system, having a field frame member, for forming a field frame image; and a second optical system which forms a second image, and has an incident optical axis being apart from an incident optical axis of said first optical system by a predetermined base length; wherein by merging the optical paths of said first optical system, said field frame optical system and said second optical system, said first image, said field frame image and said second image are viewed in a single field of view; said rangefinder optical system comprising:a field frame reflection member for deflecting a bundle of rays transmitted through said field frame member towards an optical-path merging member in said first optical system; a second optical system reflection member for deflecting the incident optical axis of said second optical system towards said field frame reflection member; and an optical-path merging member of said second optical system, integrally formed on said field frame reflection member, for deflecting a bundle of rays from said second optical system reflection member towards said first optical system, and merging said bundle of rays into said field frame optical system; wherein said second image by said second optical system is formed on the side of said second optical system reflection member with respect to said optical-path merging member of said second optical system, so that said second image is formed at a position substantially optical-equivalent to the position of said field frame member, when viewed from said first optical system.