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1. US20170184828 - Variable-power optical system, optical device, and method for manufacturing variable-power optical system

Office
United States of America
Application Number 15418773
Application Date 29.01.2017
Publication Number 20170184828
Publication Date 29.06.2017
Grant Number 10254519
Grant Date 09.04.2019
Publication Kind B2
IPC
G02B 15/14
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
15Optical objectives with means for varying the magnification
14by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
G02B 15/20
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
15Optical objectives with means for varying the magnification
14by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
16with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
20having an additional movable lens or lens group for varying the objective focal length
G02B 15/16
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
15Optical objectives with means for varying the magnification
14by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
16with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
G02B 15/173
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
15Optical objectives with means for varying the magnification
14by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
16with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
163having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
167having an additional fixed front lens or group of lenses
173arranged + – +
H04N 5/225
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
5Details of television systems
222Studio circuitry; Studio devices; Studio equipment
225Television cameras
G02B 13/18
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
13Optical objectives specially designed for the purposes specified below
18with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
CPC
G02B 13/009
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
13Optical objectives specially designed for the purposes specified below
001Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
009having zoom function
G02B 13/04
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
13Optical objectives specially designed for the purposes specified below
04Reversed telephoto objectives
G02B 13/18
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
13Optical objectives specially designed for the purposes specified below
18with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
G02B 15/14
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
15Optical objectives with means for varying the magnification
14by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
G02B 15/15
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
15Optical objectives with means for varying the magnification
14by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
15compensation by means of only one movement or by means of only linearly related movements, e.g. optical compensation
G02B 15/16
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
15Optical objectives with means for varying the magnification
14by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
16with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
Applicants Nikon Corporation
Inventors Kosuke Machida
Agents Shapiro, Gabor and Rosenberger, PLLC
Priority Data 2014-154840 30.07.2014 JP
2014-154841 30.07.2014 JP
2014-154842 30.07.2014 JP
Title
(EN) Variable-power optical system, optical device, and method for manufacturing variable-power optical system
Abstract
(EN)

Composing, in order from an object side, a first lens group G1 having negative refractive power, a second lens group G2 having positive refractive power and at least one lens group G3; upon varying magnification, a distance between the first lens group G1 and the second lens group G2, a distance between the second lens group G2 and a lens group G3 at an image side of the second lens group G2 and adjacent thereto, being varied; and a given conditional expression being satisfied; thereby providing a variable magnification optical system having a superb optical performance upon focusing, an optical device and a method for manufacturing the variable magnification optical system.