OBJECTIVE Russian patent published in 2005 - IPC

FIELD: optical engineering.

SUBSTANCE: objective has positive component disposed at the side of object. Positive component has two lenses one of which has to be biconvex. Objective also has negative component disposed at the side of object and made in form of meniscus. Biconvex lens of positive component has focal power being equal to 0,3-05 total focal power of objective. The other lens of objective is made in form of positive meniscus turned with its convexity to object. The lens has focal power being equal to 0,15-0,25 of total focal power of objective. The lens is disposed between object and biconvex lens at distance being equal to 0,15-0,25 of focal length of objective. Hologram optical element is applied onto one optical surface of the lens of positive component; focal power of the element equals to 0,01-0,1 focal power of objective. Negative component is turned with its convexity to image and it has focal power of 0,15-03 focal power of objective. Objective is provided with additional component in form of asymmetric biconvex lens with focal power of o5-0,8 focal power of objective; the lens is disposed between negative and positive components at distance of 0,3-0,6 focal length of o objective from negative component and turned to object with the side having smaller radius of curvature.

EFFECT: improved correction of aberrations; improved quality of image; widened field of view of objective.

2 cl, 2 dwg