| 摘要 |
FIELD: physics.SUBSTANCE: device has radiating and observation channels that are merged by a beam-splitter prism which turns the beam path of the radiating channel by an angle of 90°. A lens enters both the radiating channel, having a grid with a cross which is illuminated with a light source, e.g. a light-emitting diode, and the observation channel, having an eyepiece and a second grid standing between said eyepiece and the beam-splitter prism. The lens lies on the same axis with the eyepiece and has discrete variation of focal distance from two optical elements with possibility of moving from light rays the second optical element on the beam path of the observation channel. Focal distance during combined operation of the two optical elements is at least twice shorter than during operation of the first optical element. Each optical element is made from multiple separate components.EFFECT: design of a device with focal distance of the lens and visible magnification of the observation channel suitable for fast preliminary aiming at an object, and with a long focal distance of the lens and visible magnification of the observation channel suitable for quality final aiming at an object and high accuracy of measurement and adjustment.4 cl, 1 dwg, 4 tbl |
