COLLIMATOR OBJECTIVE LENS Russian patent published in 2014 - IPC G02B27/30 G02B17/08 

FIELD: physics, optics.

SUBSTANCE: objective lens can be used for operation in a visual and short IR wavelength range. The objective lens of the collimator contains a primary mirror, the first surface (along the radiation path) of which is has a reflecting coating, the secondary mirror with a reflecting coating on a ring peripheral part, and the reflecting surfaces of mirrors are faced to each other, two-lens optical element placed behind the primary mirror from the side of the image space and consisting along the beam path from a single negative lens, facing with concave surface towards the image space, and a single biconvex lens. The primary and secondary mirrors are designed as continuous parallel plate plates, on the primary mirror the reflecting coat is applied on its central zone, the peripheral part is transparent. On the first from the side of the surface subject in the central zone of the secondary mirror the test object designed as a transparent mark or cross-hair against the opaque background is located.

EFFECT: increase of focal distance, of diameter of output pupil for the simplified design and improved manufacturability with keeping of high quality of the image.

1 dwg, 2 tbl