OPTICAL SIGHT WITH VARIABLE ENLARGEMENT (VERSIONS) Russian patent published in 2018 - IPC G02B23/00 F41G1/38 

FIELD: physics.

SUBSTANCE: optical sight system consists of a lens, a plane-parallel plate with the aiming mark and scales, an erecting system, a field diaphragm, and an eyepiece located in the course of rays. The lens is made three-component. The erecting system comprises two two-lens glued components differentially moving along the optical axis of the erecting system and a negative lens. The plane-parallel plate with the aiming mark and scales and the erecting system are made jointly swinging around a point combined with the axial point of the plane of the second real image. In the first version, the eyepiece consists of a two-lensed glued component arranged along the rays, a positive meniscus facing the concave surface to the field diaphragm, and a biconvex lens. In the second version, the eyepiece is made of a single positive lens and a two-lens gluing. Between the parameters of the device, the ratios stated in the claim are fulfilled.

EFFECT: simplifying the design of the optical system of the sight, increasing the manufacturability of its production, increasing the transmittance.

2 dwg, 4 tbl, 23 cl