OBJECTIVE Russian patent published in 2005 - IPC

FIELD: optics.

SUBSTANCE: device has seven components, first of which is made in form of single biconvex lens, second one - in form of positive meniscus, directed by concave surface to images space and glued together from flat-convex and flat-concave lenses, third component has negative meniscus, directed by concave surface to objects space, fourth component has biconvex lens, fifth component is made in form of biconcave lens, sixth component - in form of single biconvex lens. After sixth component seventh component is inserted, containing single meniscus, directed by concave surface to images space and made of glass with refraction coefficient not greater than 1,48. distance between third and fourth components is not less than 0,08 focal distance of objective, and distance between sixth and seventh components is not less than 0,36 focal distance of objective.

EFFECT: increased field of view, and also higher image quality in broad spectrum range λ=540-900 nm due to increase of modulation transfer coefficients for whole field of view.

2 cl, 7 dwg