Patent ID: 6362918
Filing Date: 2002-03-26
Classification: G02B

Abstract:
A telescopic device for magnifying an image comprising:a housing having an eyepiece aperture and an objective aperture, and a space for including a folded optical path; an eyepiece group lens associated with said eyepiece aperture and located along a first optical axis; an objective group lens associated with said objective aperture and located along a second optical axis, which is slightly displaced with respect to first axis, said objective group lens having a focal length greater than a focal length of said eyepiece group for forming a magnifying optical system; and an image erecting system including a first reflective element, a second reflective element and a third reflective element deployed within said housing so as to define a folded converging light bundle from said objective group lens to said eyepiece group lens, wherein one of said first, second and third reflective elements is a roof reflector and at least one other of said first, second and third reflective elements is a plane mirror, said first, second and third reflective elements being deployed such that said light bundle travels through at least one part of said space in three different directions, said image erecting system approximating to an at least partially hollow implementation of a Hensolt prism.