Wide-range, wide-angle compound zoom with simplified zooming...

Details Wide-range, wide-angle compound zoom with simplified zooming... Wide-range, wide-angle compound zoom with simplified zooming...

G - Physics

02

B

G02B 15/14 (2006.01)

Patent

CA 2604804

A zoom lens is disclosed having a zoom ratio larger than four with a field of view at the short focal length position larger than 85 degrees and with a minimal number of moving groups. The zoom lens utilizes a compound zoom structure comprising an NP or NPP zoom kernel followed by a P or PP zoom relay, with only two or three moving groups that can be used for both zooming, focusing and athermalization. An overall compact package size is achieved by the use of prisms to fold the optical path in strategic locations. An optional variable power liquid cell can provide close focusing with little or no focus breathing.

Cette invention concerne un objectif zoom ayant un rapport de zoom supérieur à quatre avec un champ de vision dans la position de courte longueur focale supérieur à 85 degrés et avec un nombre minimum de groupes en mouvement. Cet objectif zoom utilise une structure de zoom composée comprenant un noyau de zoom NP ou NPP suivi par un relais de zoom P ou PP, avec seulement deux ou trois groupes en mouvement qui peuvent être utilisés à la fois pour le zoomage, la mise au point et l'athermalisation. On obtient un boîtier du taille globale compacte grâce à l'utilisation de prismes servant à replier le trajet optique aux endroits stratégiques. Une cellule liquide de puissance variable optionnelle peut fournir une mise au point serrée avec peu ou pas de respiration du point focal.

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