| 摘要 |
FIELD: physics.SUBSTANCE: ocular device consists of, on a beam path, a glass plate with an aiming mark on its plane facing a lens unit, a dichroic coating and a lens unit. A dichroic coating is deposited on the flat surface of an additional glass plate placed in front of the glass plate with the aiming mark and separated therefrom by an air gap.EFFECT: increased defocusing of the parasitic image of elements of the aiming mark with constant thickness of the glass plate and avoiding the need to change the position of the glass plate with the aiming mark relative to the object plane and the focal distance of the lens unit during adjustment.1 dwg |
