LARGE-APERTURE LENS Russian patent published in 2011 - IPC G02B9/62 

FIELD: physics.

SUBSTANCE: lens has two components separated by an aperture diaphragm. The first component contains three menisci whose convex sides face the object space: a positive meniscus, a glued meniscus consisting of a positive and a negative meniscus, and a negative meniscus with optical power φ_I, glued from a biconvex lens with optical power φ_I,1 and a biconcave lens with optical power φ_I,2. The second component consists of a negative meniscus consisting of a biconvex and a biconcave lens glued to each other, the concave side of said negative meniscus facing the object space, a biconvex lens and a positive meniscus whose convex side faces the object space. The negative meniscus of the first component and the positive meniscus with optical power φ_p of the second component are in form of a single lens. Relative optical power of the single and glued lenses assumes the following values:

where φ_eq is the equivalent optical power of the lens as a whole.

EFFECT: increasing the linear image field to a S35 film format (25,5 × 18,6 mm) while simultaneously increasing the rear section and maintaining quality of the image.

1 dwg, 1 app