VARIABLE MAGNIFICATION OPTICAL SYSTEM, OPTICAL APPARATUS, AND VARIABLE MAGNIFICATION OPTICAL SYSTEM MANUFACTURING METHOD

WIPO Patent Application WO/2024/034309

A1

A variable magnification optical system (ZL) comprises, arranged in order from the object side and along the optical axis: an object-side lens group (GA) having a positive refractive power; an intermediate group (GM) having a positive refractive power; and a rear group (GR). The intermediate group (GM) includes at least one lens group. The rear group (GR) includes, arranged in order from the object side and along the optical axis: a first succeeding lens group (GR1) having a negative refractive power; a second succeeding lens group (GR2) having a positive refractive power; and a third succeeding lens group (GR3) having a negative refractive power. When varying magnification, the interval between the adjacent lens groups changes, and the second succeeding lens group (GR2) moves along the optical axis when focusing, and as a result thereof, the following formula is satisfied.　Formula: １．０５＜ｆ１／ＴＬｗ＜２．０, wherein f1 is the focal distance of the object-side lens group (GA), and TLw is the total length of the variable magnification optical system (ZL) when the same is in the wide-angle state.

JPH07151972	REAR FOCUS TYPE ZOOM LENS
JP6683238	Variable magnification optical system and optical equipment
JPS5913212	ZOOM LENS

ONO TAKURO (JP)
TACHI HIDEYUKI (JP)

PCT/JP2023/025401

February 15, 2024

July 10, 2023

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NIKON CORP (JP)

G02B15/20; G02B13/18

JP2020027156A	2020-02-20
JP2013101316A	2013-05-23
JP2016126226A	2016-07-11
JP2013109013A	2013-06-06
JP2014157225A	2014-08-28
JP2016139125A	2016-08-04
JP2019008236A	2019-01-17
JP2017173680A	2017-09-28
JP2022103302A	2022-07-07

OHNISHI, Shogo et al. (JP)

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