title: Quasi-null lens optical system for the fabrication of an oblate convex ellipsoidal mirror: application to the Wide Angle Camera of the Rosetta space mission.
abstract: The design of a quasi-null lens system for the fabrication of an aspheric oblate convex ellipsoidal mirror is presented. The Performance and tolerance of the system have been analyzed. The system has been applied successfully for the fabrication of the primary mirror of the Wide Angle Camera (WAC), the imaging system onboard the Rosetta, the European Space Agency cornerstone mission dedicated to the exploration of a comet. The WAC is based on an off-axis two-mirror configuration, in which the primary mirror is an oblate convex ellipsoid with a significant conic constant.
authors.affiliation: CNR-INFM-LUXOR-Laboratory for Ultraviolet and X-ray Optical Research, Via Gradenigo, 6/B-35131, Padova, PD, Italy. pelizzo@dei.unipd.it
authors.forename: Maria-Guglielmina
authors.initials: MG
authors.lastname: Pelizzo
authors.forename: Vania
authors.initials: V
authors.lastname: Da Deppo
authors.forename: Giampiero
authors.initials: G
authors.lastname: Naletto
authors.forename: Roberto
authors.initials: R
authors.lastname: Ragazzoni
authors.forename: Andrea
authors.initials: A
authors.lastname: Novi