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专利名称：VARIABLE POWER OPTICAL SYSTEM,
OPTICAL DEVICE, IMAGING DEVICE, ANDMETHOD FOR PRODUCING VARIABLEPOWER OPTICAL SYSTEM
发明人：MACHIDA, Kosuke申请号：EP16846628申请日：20160916公开号：EP3351987A4公开日：20190522
摘要：Comprising a positive first lens group G1 disposed at a most object side, anegative intermediate group G2 disposed at an image side of the first lens group G1, apositive focusing group G3 disposed at an image side of the intermediate group G2, thefocusing group G3 being moved upon focusing, and a positive image side group G4disposed at an image side of the focusing group G3; upon varying magnification, adistance between the first lens group G1 and the intermediate group G2, a distancebetween the intermediate group G2 and the focusing group G3 and a distance betweenthe focusing group G3 and the image side group G4 being varied; and the image sidegroup G4 comprising, in order from an object side, a positive A group G4A, a negative Bgroup G4B satisfying a predetermined conditional expression with respect to the A groupG4A, and a C group G4C, whereby a variable magnification optical system having excellentoptical performance and a focusing lens group reduced in weight in order to attain highspeed focusing operation, and others are provided.
申请人：Nikon Corporation
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