BINOCULAR OPTICAL SYSTEM AND BINOCULAR

摘要

PROBLEM TO BE SOLVED: To provide a binocular optical system whose full length is short in the optical axis direction of an objective lens.;SOLUTION: The binocular optical system (100) has a pair of eyepiece optical systems (13), and is mounted to a single objective optical system (11). The binocular optical system (100) includes a reflecting surface (S21) for reflecting a light beam from the objective optical system (11) perpendicularly to the optical axis direction of the objective lens (111), a luminous flux-dividing optical system (S112) for dividing the reflected light on the reflecting surface (S21) in the surface perpendicular to the optical axis direction, a first reflective optical system (100L) that reflects one luminous flux divided by the luminous flux-dividing optical system (S112) on a perpendicular surface a plurality of times and finally guides it to one of the pair of eyepiece optical systems (13), and a second reflective optical system (100R) that reflects the other luminous flux divided by the luminous flux-dividing optical system (S112) on a perpendicular surface a plurality of times and finally guides it to the other of the pair of eyepiece optical systems (13).;COPYRIGHT: (C)2011,JPO&INPIT