Patent ID: 6188516
Filing Date: 2001-02-13
Classification: G02B

Abstract:
A wide-view monocular telescopic optical system in which a reverse reflection optical system is interposed between an objective lens system and an eye lens system, the reverse reflection optical system comprising:a first reflector arranged so as to be at an angle of 45 degrees to an incident optical axis;a right-angled isosceles triangle prism having roof surfaces whose ridge line is laid on an axis parallel with the incident optical axis so as to receive light reflected by the first reflector at a part of an oblique side surface of the prism; anda second reflector arranged to oppose another part of the oblique side surface of the right-angled isosceles triangle prism from which a reflected light emits, the second reflector being at an angle of 45 degrees to the reflected light axis, the wide-view monocular telescopic optical system further comprising a meniscus relay lens arranged between the objective lens system and the eye lens system, a convex surface of the meniscus lens facing an incident side, a portion of the meniscus lens being positioned within a projection area projected by the second reflector on a horizontal plane that includes the incident optical axis.