Patent ID: 6157483
Filing Date: 2000-12-05
Classification: G02B

Abstract:
A binocular low in power but wide in field of view having an optical system of inverse reflection on an object side comprising a first specular reflector placed at an angle of 45.degree. with respect to an optical axis of incidence and a second specular reflector arranged to reflect the light having been reflected from said first specular reflector so that the light converged around its optical axis of reflection is guided in a direction orthogonal to said optical axis of incidence; an optical system of inverse reflection on an eyepiece side comprising a third specular reflector arranged to reflect the light having been reflected from said second specular reflector in parallel with but in a direction opposite to the light guided along the optical axis of incidence on said second specular reflector and a fourth specular reflector arranged to reflect the light having been reflected from said third specular reflector said so that the light converged around its optical axis of reflection is guided in parallel with said optical axis of incidence on said first specular reflector; an eyepiece placed behind the exit side of said optical system of inverse reflection on the eyepiece side; and an object lens placed in one of the respective optical paths of reflection extending from the first specular reflector to the fourth specular reflector so as to be oriented orthogonal to the corresponding optical axis of reflection.