Afocal zoom lens system

G - Physics – 02 – B

Patent

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G02B 15/14 (2006.01) G02B 15/173 (2006.01)

Patent

CA 2238233

An afocal zoom lens system comprises an object, an objective lens group of a positive refractive power, an erecting optical group, and an eyepiece lens group of a positive refractive power. The objective lens group includes a first lens unit of positive refractive power, a second lens unit of a negative refractive power and a third lens unit of a positive refractive power. The first lens unit and the second lens unit are movable when zooming.

L'invention est un téléobjectif afocal comportant un objet, un groupe de lentilles d'objectif à réfringence positive, un groupe optique redresseur et un groupe de lentilles de visée à réfringence positive. Le groupe de lentilles d'objectif comprend une première lentille à réfringence positive, une deuxième lentille à réfringence négative et une troisième lentille à réfringence positive. La première et la deuxième lentille sont déplacées pour faire la mise au point du téléobjectif.

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