초록 ▼

The invention provides a prism optical system which has an image-forming action and provides a clear yet substantially undistorted image at a wide field angle. In a prism optical system 5 comprising an aperture 1 and having an action on erecting an image formed by an objective, there are provided re

The invention provides a prism optical system which has an image-forming action and provides a clear yet substantially undistorted image at a wide field angle. In a prism optical system 5 comprising an aperture 1 and having an action on erecting an image formed by an objective, there are provided reflecting surfaces 31, 32, 33, 41, 42, and 43 for image inversion, each of which is constructed of a curved surface having a power, and is in an irrotationally symmetric plane shape having no rotationally symmetric axis both within and outside the surface, so that decentering aberration produced by reflection of light at the curved surfaces can be corrected.

대표청구항 ▼

[ What we claim is:] [1.]1. A prism optical system for image inversion comprising at least two prisms, wherein:at least one of said prisms is constructed of a curved surface having at least two surfaces of a rotationally asymmetric surface shape and having no rotationally symmetric axis both within

[ What we claim is:] [1.]1. A prism optical system for image inversion comprising at least two prisms, wherein:at least one of said prisms is constructed of a curved surface having at least two surfaces of a rotationally asymmetric surface shape and having no rotationally symmetric axis both within and outside said surfaces,at least one of said at least two surfaces acting as a reflecting surface having a reflecting action to make correction for rotationally asymmetric aberration produced due to decentering by said rotationally asymmetric surface shape, andsaid inverting prism optical system having a finite focal length so as to act as an ocular optical system.