Patent ID: 6384969
Filing Date: 2002-05-07
Classification: G02B

Abstract:
A telescope, comprising:an erecting system having first, second, third and fourth reflecting surfaces that are arranged from an object side, said first and second reflecting surfaces and said third and fourth reflecting surfaces facing each other at a right angle, respectively, wherein an intersection line between extended surfaces of said first and second reflecting surfaces is perpendicular to an intersection line between extended surfaces of said third and fourth reflecting surfaces; an objective lens that is located between said second and third reflecting surfaces, said objective lens having a positive refractive power to converge object light that is reflected by said first and second reflecting surfaces for forming an image; an eyepiece that is located between said fourth reflecting surface and an eye point, said eyepiece having a positive refractive power to magnify said image formed by said wherein said first reflecting surface is formed on a retractable mirror that can swing between a working position where said first and second reflecting surfaces are perpendicular and a retracted position where the free end of said retractable mirror moves close to said second reflecting surface.