Patent ID: 6735014
Filing Date: 2004-05-11
Classification: G02B,H03M

Abstract:
An aberration-correcting optical relay for an optical system, the relay having an axis and comprising:two converging optical units, a front unit and a rear unit, placed on said axis and each having a focal length; at least one correcting meniscus having substantially concentric main faces the correcting meniscus being placed on said axis between the two converging optical units; and a diverging lens placed between the meniscus and the rear converging optical unit on said axis; wherein the front converging optical unit is situated upstream from the correcting meniscus and is placed in such a manner that the distance from an object point to the front converging optical unit is equal to the focal length of the front converging optical unit, such as to transform a beam coming from said object point into a parallel beam, and wherein at least one of the diverging lens and the meniscus is formed by a doublet of two types of glass having the same refractive index and very different Abbe numbers.