| 摘要 |
An optical sight ensures a more accurate aim at feebly discernible targets in the twilight and in dull weather. The sight includes an objective, a reticule, an erecting system consisting of a first and a second positive component, each of which is cemented of two lenses, and an eyepiece. The sight also includes a beam-splitting cube, the beam-splitting face made as a diagonal face, three mirrors and a third positive component cemented of two lenses, a first plane mirror parallel to the beam-splitting face of the cube on the same axis with the third positive component, a second plane mirror perpendicular to the first mirror in front of a focal plane of the eyepiece, and a third mirror tilted to the optical axis and faced with its reflective surface toward the eyepiece arranged between the eyepiece focal plane and the second component of the erecting system. |
| 主权项 |
1. An optical sight comprising, in series arranged, an objective, a first reticle, an erecting system consisting of a first and second positive components each of which is cemented of two lenses, an eyepiece, and further a beam-splitting cube which beam-splitting plane is made as a diagonal face, three mirrors and a third positive component cemented of two lenses, a first plane mirror parallel to the beam-splitting face of the cube being arranged on the same axis with the third positive component, a second plane mirror being arranged perpendicular to the first mirror in front of the focal plane of the eyepiece and a third mirror tilted to an optical axis and faced by its reflective surface towards the eyepiece being arranged between the focal plane of the eyepiece and the second component of the erecting system, characterized in that the beam-splitting cube is arranged in front of the erecting system so that its front face towards the objective, on which the first reticle is applied, is in the focal plane of the objective, cemented to the lower face of the beam-splitting cube is a second illuminated reticle optically conjugated with the first reticle, the third positive component is cemented to the upper face of the cube, and arranged axially between the first and second mirror is a fourth positive component cemented of two lenses. |
