Compact high performance zoom lens system

G - Physics – 02 – B

Patent

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G02B 15/14 (2006.01)

Patent

CA 2608697

A compact high performance objective zoom lens system is disclosed that provides optimum optical performance over the entire zoom focal length range at focus distances from close to infinity. The system comprises, from object space to image space, one focusing objective lens group (comprising a focus lens group and a stationary lens group) and three zoom lens groups aligned on the optical axis. The focus lens group and the zoom lens groups are axially movable along the optical axis for focusing and zooming. In one embodiment, the system has a focal length zoom region from about 19 mm to 90 mm, an aperture of F/2.7 and substantially the same optical performance as high quality fixed objective lenses of the same range. The performance characteristics of this system makes it suitable for use with both film and electronic detector cameras.

L~invention concerne un système de lentilles de zoom haute performance compact qui offre des résultats optimaux sur toute la plage de distance focale de zoom (du foyer jusqu~à l~infini). Le système comprend, de l~espace objet à l~espace image, un groupe d~objectifs de focalisation (avec un groupe de lentilles de focalisation et un groupe de lentilles stationnaires) et trois groupes de lentilles de zoom alignés sur l~axe optique. Le groupe d~objectifs de focalisation et les groupes de lentilles de zoom sont mobiles de manière axiale le long de l~axe optique pour focalisation et zoom. Dans un mode de réalisation de l~invention, le système possède une plage de distance focale de zoom allant d~environ 19 mm à 90 mm, une ouverture de F/2.7 et sensiblement les mêmes performances optiques que des objectifs fixes haut de gamme équivalents. Les caractéristiques de performances de ce système le destinent à une utilisation dans des caméras et des détecteurs électroniques.

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