LENS WITH DISCRETE CHANGE OF DISTANCE Russian patent published in 2004 - IPC

FIELD: optics.

SUBSTANCE: lens includes three components. First component is positive and comprises positive lens cemented from negative meniscus facing space of images with concavity and positive lens, second negative component consists of negative meniscus facing space of images with concavity, biconcave lens and negative lens cemented from positive meniscus facing space of objects with concave surface and negative lens which is mounted for movement along optical axis, third component incorporates positive meniscus cemented from positive meniscus facing space of objects with concavity and negative meniscus facing space of objects with concavity, beconvex lens and positive meniscus cemented from negative meniscus facing space of images with concavity and positive meniscus facing space of images with concavity.

EFFECT: enhanced relative aperture of lens, improved quality of image thanks to increase of gain factor of modulation over entire field of vision with discrete change of focal distance.

6 dwg